Ejemplo n.º 1
0
/*-----------------------------------------------------------------------------
 *
 *                             procedure sgp4init
 *
 *  this procedure initializes variables for sgp4.
 *
 *  author        : david vallado                  719-573-2600   28 jun 2005
 *  author        : david vallado                  719-573-2600   28 jun 2005
 *
 *  inputs        :
 *    opsmode     - mode of operation afspc or improved 'a', 'i'
 *    satn        - satellite number
 *    bstar       - sgp4 type drag coefficient              kg/m2er
 *    ecco        - eccentricity
 *    epoch       - epoch time in days from jan 0, 1950. 0 hr
 *    argpo       - argument of perigee (output if ds)
 *    inclo       - inclination
 *    mo          - mean anomaly (output if ds)
 *    no          - mean motion
 *    nodeo       - right ascension of ascending node
 *
 *  outputs       :
 *    rec      - common values for subsequent calls
 *    return code - non-zero on error.
 *                   1 - mean elements, ecc >= 1.0 or ecc < -0.001 or a < 0.95 er
 *                   2 - mean motion less than 0.0
 *                   3 - pert elements, ecc < 0.0  or  ecc > 1.0
 *                   4 - semi-latus rectum < 0.0
 *                   5 - epoch elements are sub-orbital
 *                   6 - satellite has decayed
 *
 *  locals        :
 *    cnodm  , snodm  , cosim  , sinim  , cosomm , sinomm
 *    cc1sq  , cc2    , cc3
 *    coef   , coef1
 *    cosio4      -
 *    day         -
 *    dndt        -
 *    em          - eccentricity
 *    emsq        - eccentricity squared
 *    eeta        -
 *    etasq       -
 *    gam         -
 *    argpm       - argument of perigee
 *    nodem       -
 *    inclm       - inclination
 *    mm          - mean anomaly
 *    nm          - mean motion
 *    perige      - perigee
 *    pinvsq      -
 *    psisq       -
 *    qzms24      -
 *    rtemsq      -
 *    s1, s2, s3, s4, s5, s6, s7          -
 *    sfour       -
 *    ss1, ss2, ss3, ss4, ss5, ss6, ss7         -
 *    sz1, sz2, sz3
 *    sz11, sz12, sz13, sz21, sz22, sz23, sz31, sz32, sz33        -
 *    tc          -
 *    temp        -
 *    temp1, temp2, temp3       -
 *    tsi         -
 *    xpidot      -
 *    xhdot1      -
 *    z1, z2, z3          -
 *    z11, z12, z13, z21, z22, z23, z31, z32, z33         -
 *
 *  coupling      :
 *    getgravconst-
 *    initl       -
 *    dscom       -
 *    dpper       -
 *    dsinit      -
 *    sgp4        -
 *
 *  references    :
 *    hoots, roehrich, norad spacetrack report #3 1980
 *    hoots, norad spacetrack report #6 1986
 *    hoots, schumacher and glover 2004
 *    vallado, crawford, hujsak, kelso  2006
 * ----------------------------------------------------------------------------*/
        public void sgp4init(Satrec satrec, Sgp4initOptions options)
        {
            Globals globals = new Globals();

            double pi          = globals.pi;
            double earthRadius = globals.earthRadius;
            double j2          = globals.j2;
            double j4          = globals.j4;
            double j3oj2       = globals.j3oj2;
            double x2o3        = globals.x2o3;

            char   opsmode = options.opsmode;
            string satn    = options.satn;
            double epoch   = options.epoch;
            double xbstar  = options.xbstar;
            double xecco   = options.xecco;
            double xargpo  = options.xargpo;
            double xinclo  = options.xinclo;
            double xmo     = options.xmo;
            double xno     = options.xno;
            double xnodeo  = options.xnodeo;


            double cosim;
            double sinim;
            double cc1sq;
            double cc2;
            double cc3;
            double coef;
            double coef1;
            double cosio4;
            double em;
            double emsq;
            double eeta;
            double etasq;
            double argpm;
            double nodem;
            double inclm;
            double mm;
            double nm;
            double perige;
            double pinvsq;
            double psisq;
            double qzms24;
            double s1;
            double s2;
            double s3;
            double s4;
            double s5;
            double sfour;
            double ss1;
            double ss2;
            double ss3;
            double ss4;
            double ss5;
            double sz1;
            double sz3;
            double sz11;
            double sz13;
            double sz21;
            double sz23;
            double sz31;
            double sz33;
            double tc;
            double temp;
            double temp1;
            double temp2;
            double temp3;
            double tsi;
            double xpidot;
            double xhdot1;
            double z1;
            double z3;
            double z11;
            double z13;
            double z21;
            double z23;
            double z31;
            double z33;

            /* ------------------------ initialization --------------------- */
            // sgp4fix divisor for divide by zero check on inclination
            // the old check used 1.0 + Math.cos(pi-1.0e-9), but then compared it to
            // 1.5 e-12, so the threshold was changed to 1.5e-12 for consistency
            double temp4 = 1.5e-12;

            // ----------- set all near earth variables to zero ------------
            satrec.isimp   = 0; satrec.method = 'n'; satrec.aycof = 0.0;
            satrec.con41   = 0.0; satrec.cc1 = 0.0; satrec.cc4 = 0.0;
            satrec.cc5     = 0.0; satrec.d2 = 0.0; satrec.d3 = 0.0;
            satrec.d4      = 0.0; satrec.delmo = 0.0; satrec.eta = 0.0;
            satrec.argpdot = 0.0; satrec.omgcof = 0.0; satrec.sinmao = 0.0;
            satrec.t       = 0.0; satrec.t2cof = 0.0; satrec.t3cof = 0.0;
            satrec.t4cof   = 0.0; satrec.t5cof = 0.0; satrec.x1mth2 = 0.0;
            satrec.x7thm1  = 0.0; satrec.mdot = 0.0; satrec.nodedot = 0.0;
            satrec.xlcof   = 0.0; satrec.xmcof = 0.0; satrec.nodecf = 0.0;

            // ----------- set all deep space variables to zero ------------
            satrec.irez  = 0; satrec.d2201 = 0.0; satrec.d2211 = 0.0;
            satrec.d3210 = 0.0; satrec.d3222 = 0.0; satrec.d4410 = 0.0;
            satrec.d4422 = 0.0; satrec.d5220 = 0.0; satrec.d5232 = 0.0;
            satrec.d5421 = 0.0; satrec.d5433 = 0.0; satrec.dedt = 0.0;
            satrec.del1  = 0.0; satrec.del2 = 0.0; satrec.del3 = 0.0;
            satrec.didt  = 0.0; satrec.dmdt = 0.0; satrec.dnodt = 0.0;
            satrec.domdt = 0.0; satrec.e3 = 0.0; satrec.ee2 = 0.0;
            satrec.peo   = 0.0; satrec.pgho = 0.0; satrec.pho = 0.0;
            satrec.pinco = 0.0; satrec.plo = 0.0; satrec.se2 = 0.0;
            satrec.se3   = 0.0; satrec.sgh2 = 0.0; satrec.sgh3 = 0.0;
            satrec.sgh4  = 0.0; satrec.sh2 = 0.0; satrec.sh3 = 0.0;
            satrec.si2   = 0.0; satrec.si3 = 0.0; satrec.sl2 = 0.0;
            satrec.sl3   = 0.0; satrec.sl4 = 0.0; satrec.gsto = 0.0;
            satrec.xfact = 0.0; satrec.xgh2 = 0.0; satrec.xgh3 = 0.0;
            satrec.xgh4  = 0.0; satrec.xh2 = 0.0; satrec.xh3 = 0.0;
            satrec.xi2   = 0.0; satrec.xi3 = 0.0; satrec.xl2 = 0.0;
            satrec.xl3   = 0.0; satrec.xl4 = 0.0; satrec.xlamo = 0.0;
            satrec.zmol  = 0.0; satrec.zmos = 0.0; satrec.atime = 0.0;
            satrec.xli   = 0.0; satrec.xni = 0.0;


            // sgp4fix - note the following variables are also passed directly via satrec.
            // it is possible to streamline the sgp4init call by deleting the "x"
            // variables, but the user would need to set the satrec.* values first. we
            // include the additional assignments in case twoline2rv is not used.

            satrec.bstar = xbstar;
            satrec.ecco  = xecco;
            satrec.argpo = xargpo;
            satrec.inclo = xinclo;
            satrec.mo    = xmo;
            satrec.no    = xno;
            satrec.nodeo = xnodeo;

            //  sgp4fix add opsmode
            satrec.operationmode = opsmode;

            // ------------------------ earth constants -----------------------
            // sgp4fix identify constants and allow alternate values

            double ss = (78.0 / earthRadius) + 1.0;
            // sgp4fix use multiply for speed instead of pow
            double qzms2ttemp = (120.0 - 78.0) / earthRadius;
            double qzms2t     = qzms2ttemp * qzms2ttemp * qzms2ttemp * qzms2ttemp;

            satrec.init = 'y';
            satrec.t    = 0.0;

            InitlOptions initlOptions = new InitlOptions();

            initlOptions.satn    = satn;
            initlOptions.ecco    = satrec.ecco;
            initlOptions.epoch   = epoch;
            initlOptions.inlco   = satrec.inclo;
            initlOptions.no      = satrec.no;
            initlOptions.method  = satrec.method;
            initlOptions.opsmode = satrec.operationmode;

            Initl       initl       = new Initl();
            InitlResult initlResult = new InitlResult();

            initlResult = initl.initl(initlOptions); //TODO: Finish impl

            double ao     = initlResult.ao;
            double con42  = initlResult.con42;
            double cosio  = initlResult.cosio;
            double cosio2 = initlResult.cosio2;
            double eccsq  = initlResult.eccsq;
            double omeosq = initlResult.omeosq;
            double posq   = initlResult.posq;
            double rp     = initlResult.rp;
            double rteosq = initlResult.rteosq;
            double sinio  = initlResult.sinio;

            satrec.no    = initlResult.no;
            satrec.con41 = initlResult.con41;
            satrec.gsto  = initlResult.gsto;
            satrec.error = 0;



            // sgp4fix remove this check as it is unnecessary
            // the mrt check in sgp4 handles decaying satellite cases even if the starting
            // condition is below the surface of te earth
            // if (rp < 1.0)
            // {
            //   printf("// *** satn%d epoch elts sub-orbital ***\n", satn);
            //   satrec.error = 5;
            // }


            if (omeosq >= 0.0 || satrec.no >= 0.0)
            {
                satrec.isimp = 0;
                if (rp < (220.0 / earthRadius + 1.0))
                {
                    satrec.isimp = 1;
                }
                sfour  = ss;
                qzms24 = qzms2t;
                perige = (rp - 1.0) * earthRadius;

                // - for perigees below 156 km, s and qoms2t are altered -
                if (perige < 156.0)
                {
                    sfour = perige - 78.0;
                    if (perige < 98.0)
                    {
                        sfour = 20.0;
                    }

                    // sgp4fix use multiply for speed instead of pow
                    double qzms24temp = (120.0 - sfour) / earthRadius;
                    qzms24 = qzms24temp * qzms24temp * qzms24temp * qzms24temp;
                    sfour  = (sfour / earthRadius) + 1.0;
                }
                pinvsq = 1.0 / posq;

                tsi        = 1.0 / (ao - sfour);
                satrec.eta = ao * satrec.ecco * tsi;
                etasq      = satrec.eta * satrec.eta;
                eeta       = satrec.ecco * satrec.eta;
                psisq      = Math.Abs(1.0 - etasq);
                coef       = qzms24 * Math.Pow(tsi, 4.0);
                coef1      = coef / (Math.Pow(psisq, 3.5));
                cc2        = coef1 * satrec.no * ((ao * (1.0 + (1.5 * etasq) + (eeta * (4.0 + etasq))))
                                                  + (((0.375 * j2 * tsi) / psisq) * satrec.con41
                                                     * (8.0 + (3.0 * etasq * (8.0 + etasq)))));
                satrec.cc1 = satrec.bstar * cc2;
                cc3        = 0.0;
                if (satrec.ecco > 1.0e-4)
                {
                    cc3 = (-2.0 * coef * tsi * j3oj2 * satrec.no * sinio) / satrec.ecco;
                }
                satrec.x1mth2 = 1.0 - cosio2;
                satrec.cc4    = 2.0 * satrec.no * coef1 * ao * omeosq * (
                    ((satrec.eta * (2.0 + (0.5 * etasq)))
                     + (satrec.ecco * (0.5 + (2.0 * etasq))))
                    - (((j2 * tsi) / (ao * psisq))
                       * ((-3.0 * satrec.con41 * ((1.0 - (2.0 * eeta)) + (etasq * (1.5 - (0.5 * eeta)))))
                          + (0.75 * satrec.x1mth2
                             * ((2.0 * etasq) - (eeta * (1.0 + etasq)))
                             * Math.Cos(2.0 * satrec.argpo))))
                    );
                satrec.cc5  = 2.0 * coef1 * ao * omeosq * (1.0 + (2.75 * (etasq + eeta)) + (eeta * etasq));
                cosio4      = cosio2 * cosio2;
                temp1       = 1.5 * j2 * pinvsq * satrec.no;
                temp2       = 0.5 * temp1 * j2 * pinvsq;
                temp3       = -0.46875 * j4 * pinvsq * pinvsq * satrec.no;
                satrec.mdot = satrec.no + (0.5 * temp1 * rteosq * satrec.con41)
                              + (0.0625 * temp2 * rteosq * ((13.0 - (78.0 * cosio2)) + (137.0 * cosio4)));
                satrec.argpdot = (-0.5 * temp1 * con42)
                                 + (0.0625 * temp2 * ((7.0 - (114.0 * cosio2)) + (395.0 * cosio4)))
                                 + (temp3 * ((3.0 - (36.0 * cosio2)) + (49.0 * cosio4)));
                xhdot1         = -temp1 * cosio;
                satrec.nodedot = xhdot1 + (((0.5 * temp2 * (4.0 - (19.0 * cosio2)))
                                            + (2.0 * temp3 * (3.0 - (7.0 * cosio2)))) * cosio);
                xpidot        = satrec.argpdot + satrec.nodedot;
                satrec.omgcof = satrec.bstar * cc3 * Math.Cos(satrec.argpo);
                satrec.xmcof  = 0.0;
                if (satrec.ecco > 1.0e-4)
                {
                    satrec.xmcof = (-x2o3 * coef * satrec.bstar) / eeta;
                }
                satrec.nodecf = 3.5 * omeosq * xhdot1 * satrec.cc1;
                satrec.t2cof  = 1.5 * satrec.cc1;

                // sgp4fix for divide by zero with xinco = 180 deg
                if (Math.Abs(cosio + 1.0) > 1.5e-12)
                {
                    satrec.xlcof = (-0.25 * j3oj2 * sinio * (3.0 + (5.0 * cosio))) / (1.0 + cosio);
                }
                else
                {
                    satrec.xlcof = (-0.25 * j3oj2 * sinio * (3.0 + (5.0 * cosio))) / temp4;
                }
                satrec.aycof = -0.5 * j3oj2 * sinio;

                // sgp4fix use multiply for speed instead of pow
                double delmotemp = 1.0 + (satrec.eta * Math.Cos(satrec.mo));
                satrec.delmo  = delmotemp * delmotemp * delmotemp;
                satrec.sinmao = Math.Sin(satrec.mo);
                satrec.x7thm1 = (7.0 * cosio2) - 1.0;


                // --------------- deep space initialization -------------
                if ((2 * pi) / satrec.no >= 225.0)
                {
                    satrec.method = 'd';
                    satrec.isimp  = 1;
                    tc            = 0.0;
                    inclm         = satrec.inclo;


                    DscomOptions dscomOptions = new DscomOptions();
                    dscomOptions.epoch = epoch;
                    dscomOptions.ep    = satrec.ecco;
                    dscomOptions.argpp = satrec.argpo;
                    dscomOptions.tc    = tc;
                    dscomOptions.inclp = satrec.inclo;
                    dscomOptions.nodep = satrec.nodeo;

                    dscomOptions.np  = satrec.no;
                    dscomOptions.e3  = satrec.e3;
                    dscomOptions.ee2 = satrec.ee2;

                    dscomOptions.peo   = satrec.peo;
                    dscomOptions.pgho  = satrec.pgho;
                    dscomOptions.pho   = satrec.pho;
                    dscomOptions.pinco = satrec.pinco;

                    dscomOptions.plo = satrec.plo;
                    dscomOptions.se2 = satrec.se2;
                    dscomOptions.se3 = satrec.se3;

                    dscomOptions.sgh2 = satrec.sgh2;
                    dscomOptions.sgh3 = satrec.sgh3;
                    dscomOptions.sgh4 = satrec.sgh4;

                    dscomOptions.sh2 = satrec.sh2;
                    dscomOptions.sh3 = satrec.sh3;
                    dscomOptions.si2 = satrec.si2;
                    dscomOptions.si3 = satrec.si3;

                    dscomOptions.sl2 = satrec.sl2;
                    dscomOptions.sl3 = satrec.sl3;
                    dscomOptions.sl4 = satrec.sl4;

                    dscomOptions.xgh2 = satrec.xgh2;
                    dscomOptions.xgh3 = satrec.xgh3;
                    dscomOptions.xgh4 = satrec.xgh4;
                    dscomOptions.xh2  = satrec.xh2;

                    dscomOptions.xh3 = satrec.xh3;
                    dscomOptions.xi2 = satrec.xi2;
                    dscomOptions.xi3 = satrec.xi3;
                    dscomOptions.xl2 = satrec.xl2;

                    dscomOptions.xl3 = satrec.xl3;
                    dscomOptions.xl4 = satrec.xl4;

                    dscomOptions.zmol = satrec.zmol;
                    dscomOptions.zmos = satrec.zmos;



                    Dscom       dscom       = new Dscom();
                    DscomResult dscomResult = new DscomResult();

                    dscomResult = dscom.dscom(dscomOptions);

                    satrec.e3  = dscomResult.e3;
                    satrec.ee2 = dscomResult.ee2;

                    satrec.peo  = dscomResult.peo;
                    satrec.pgho = dscomResult.pgho;
                    satrec.pho  = dscomResult.pho;

                    satrec.pinco = dscomResult.pinco;
                    satrec.plo   = dscomResult.plo;
                    satrec.se2   = dscomResult.se2;
                    satrec.se3   = dscomResult.se3;

                    satrec.sgh2 = dscomResult.sgh2;
                    satrec.sgh3 = dscomResult.sgh3;
                    satrec.sgh4 = dscomResult.sgh4;
                    satrec.sh2  = dscomResult.sh2;
                    satrec.sh3  = dscomResult.sh3;

                    satrec.si2 = dscomResult.si2;
                    satrec.si3 = dscomResult.si3;
                    satrec.sl2 = dscomResult.sl2;
                    satrec.sl3 = dscomResult.sl3;
                    satrec.sl4 = dscomResult.sl4;

                    sinim = dscomResult.sinim;
                    cosim = dscomResult.cosim;
                    em    = dscomResult.em;
                    emsq  = dscomResult.emsq;
                    s1    = dscomResult.s1;
                    s2    = dscomResult.s2;
                    s3    = dscomResult.s3;
                    s4    = dscomResult.s4;
                    s5    = dscomResult.s5;
                    ss1   = dscomResult.ss1;
                    ss2   = dscomResult.ss2;
                    ss3   = dscomResult.ss3;
                    ss4   = dscomResult.ss4;
                    ss5   = dscomResult.ss5;
                    sz1   = dscomResult.sz1;
                    sz3   = dscomResult.sz3;
                    sz11  = dscomResult.sz11;
                    sz13  = dscomResult.sz13;
                    sz21  = dscomResult.sz21;
                    sz23  = dscomResult.sz23;
                    sz31  = dscomResult.sz31;
                    sz33  = dscomResult.sz33;

                    satrec.xgh2 = dscomResult.xgh2;
                    satrec.xgh3 = dscomResult.xgh3;
                    satrec.xgh4 = dscomResult.xgh4;
                    satrec.xh2  = dscomResult.xh2;
                    satrec.xh3  = dscomResult.xh3;
                    satrec.xi2  = dscomResult.xi2;
                    satrec.xi3  = dscomResult.xi3;
                    satrec.xl2  = dscomResult.xl2;
                    satrec.xl3  = dscomResult.xl3;
                    satrec.xl4  = dscomResult.xl4;
                    satrec.zmol = dscomResult.zmol;
                    satrec.zmos = dscomResult.zmos;

                    nm  = dscomResult.nm;
                    z1  = dscomResult.z1;
                    z3  = dscomResult.z3;
                    z11 = dscomResult.z11;
                    z13 = dscomResult.z13;
                    z21 = dscomResult.z21;
                    z23 = dscomResult.z23;
                    z31 = dscomResult.z31;
                    z33 = dscomResult.z33;


                    DpperOptions dpperOptions = new DpperOptions();
                    dpperOptions.inclo   = inclm;
                    dpperOptions.init    = satrec.init;
                    dpperOptions.ep      = satrec.ecco;
                    dpperOptions.inclp   = satrec.inclo;
                    dpperOptions.nodep   = satrec.nodeo;
                    dpperOptions.argpp   = satrec.argpo;
                    dpperOptions.mp      = satrec.mo;
                    dpperOptions.opsmode = satrec.operationmode;


                    Dpper       dpper       = new Dpper();
                    DpperResult dpperResult = new DpperResult();

                    dpperResult = dpper.dpper(satrec, dpperOptions);

                    satrec.ecco  = dpperResult.ep;
                    satrec.inclo = dpperResult.inclp;
                    satrec.nodeo = dpperResult.nodep;
                    satrec.argpo = dpperResult.argpp;
                    satrec.mo    = dpperResult.mp;

                    argpm = 0.0;
                    nodem = 0.0;
                    mm    = 0.0;



                    DsinitOptions dsinitOptions = new DsinitOptions();

                    dsinitOptions.cosim = cosim;
                    dsinitOptions.emsq  = emsq;
                    dsinitOptions.argpo = satrec.argpo;
                    dsinitOptions.s1    = s1;
                    dsinitOptions.s2    = s2;
                    dsinitOptions.s3    = s3;
                    dsinitOptions.s4    = s4;
                    dsinitOptions.s5    = s5;
                    dsinitOptions.sinim = sinim;
                    dsinitOptions.ss1   = ss1;
                    dsinitOptions.ss2   = ss2;
                    dsinitOptions.ss3   = ss3;
                    dsinitOptions.ss4   = ss4;
                    dsinitOptions.ss5   = ss5;
                    dsinitOptions.sz1   = sz1;
                    dsinitOptions.sz3   = sz3;
                    dsinitOptions.sz11  = sz11;
                    dsinitOptions.sz13  = sz13;
                    dsinitOptions.sz21  = sz21;
                    dsinitOptions.sz23  = sz23;
                    dsinitOptions.sz31  = sz31;
                    dsinitOptions.sz33  = sz33;
                    dsinitOptions.t     = satrec.t;

                    dsinitOptions.tc      = tc;
                    dsinitOptions.gsto    = satrec.gsto;
                    dsinitOptions.mo      = satrec.mo;
                    dsinitOptions.mdot    = satrec.mdot;
                    dsinitOptions.no      = satrec.no;
                    dsinitOptions.nodeo   = satrec.nodeo;
                    dsinitOptions.nodedot = satrec.nodedot;

                    dsinitOptions.xpidot = xpidot;
                    dsinitOptions.z1     = z1;
                    dsinitOptions.z3     = z3;
                    dsinitOptions.z11    = z11;
                    dsinitOptions.z13    = z13;
                    dsinitOptions.z21    = z21;
                    dsinitOptions.z23    = z23;
                    dsinitOptions.z31    = z31;
                    dsinitOptions.z33    = z33;
                    dsinitOptions.ecco   = satrec.ecco;

                    dsinitOptions.eccsq = eccsq;
                    dsinitOptions.em    = em;
                    dsinitOptions.argpm = argpm;
                    dsinitOptions.inclm = inclm;
                    dsinitOptions.mm    = mm;
                    dsinitOptions.nm    = nm;
                    dsinitOptions.nodem = nodem;

                    dsinitOptions.irez  = satrec.irez;
                    dsinitOptions.atime = satrec.atime;
                    dsinitOptions.d2201 = satrec.d2201;
                    dsinitOptions.d2211 = satrec.d2211;
                    dsinitOptions.d3210 = satrec.d3210;
                    dsinitOptions.d3222 = satrec.d3222;
                    dsinitOptions.d4410 = satrec.d4410;
                    dsinitOptions.d4422 = satrec.d4422;
                    dsinitOptions.d5220 = satrec.d5220;
                    dsinitOptions.d5232 = satrec.d5232;
                    dsinitOptions.d5421 = satrec.d5421;
                    dsinitOptions.d5433 = satrec.d5433;
                    dsinitOptions.dedt  = satrec.dedt;
                    dsinitOptions.didt  = satrec.didt;
                    dsinitOptions.dmdt  = satrec.dmdt;
                    dsinitOptions.dnodt = satrec.dnodt;
                    dsinitOptions.domdt = satrec.domdt;
                    dsinitOptions.del1  = satrec.del1;
                    dsinitOptions.del2  = satrec.del2;
                    dsinitOptions.del3  = satrec.del3;
                    dsinitOptions.xfact = satrec.xfact;
                    dsinitOptions.xlamo = satrec.xlamo;
                    dsinitOptions.xli   = satrec.xli;
                    dsinitOptions.xni   = satrec.xni;

                    Dsinit       dsinit       = new Dsinit();
                    DsinitResult dsinitResult = new DsinitResult();
                    dsinitResult = dsinit.dsinit(dsinitOptions);

                    satrec.irez  = dsinitResult.irez;
                    satrec.atime = dsinitResult.atime;
                    satrec.d2201 = dsinitResult.d2201;
                    satrec.d2211 = dsinitResult.d2211;

                    satrec.d3210 = dsinitResult.d3210;
                    satrec.d3222 = dsinitResult.d3222;
                    satrec.d4410 = dsinitResult.d4410;
                    satrec.d4422 = dsinitResult.d4422;
                    satrec.d5220 = dsinitResult.d5220;

                    satrec.d5232 = dsinitResult.d5232;
                    satrec.d5421 = dsinitResult.d5421;
                    satrec.d5433 = dsinitResult.d5433;
                    satrec.dedt  = dsinitResult.dedt;
                    satrec.didt  = dsinitResult.didt;

                    satrec.dmdt  = dsinitResult.dmdt;
                    satrec.dnodt = dsinitResult.dnodt;
                    satrec.domdt = dsinitResult.domdt;
                    satrec.del1  = dsinitResult.del1;

                    satrec.del2  = dsinitResult.del2;
                    satrec.del3  = dsinitResult.del3;
                    satrec.xfact = dsinitResult.xfact;
                    satrec.xlamo = dsinitResult.xlamo;
                    satrec.xli   = dsinitResult.xli;

                    satrec.xni = dsinitResult.xni;
                }

                // ----------- set variables if not deep space -----------
                if (satrec.isimp != 1)
                {
                    cc1sq        = satrec.cc1 * satrec.cc1;
                    satrec.d2    = 4.0 * ao * tsi * cc1sq;
                    temp         = (satrec.d2 * tsi * satrec.cc1) / 3.0;
                    satrec.d3    = ((17.0 * ao) + sfour) * temp;
                    satrec.d4    = 0.5 * temp * ao * tsi * ((221.0 * ao) + (31.0 * sfour)) * satrec.cc1;
                    satrec.t3cof = satrec.d2 + (2.0 * cc1sq);
                    satrec.t4cof = 0.25 * ((3.0 * satrec.d3)
                                           + (satrec.cc1 * ((12.0 * satrec.d2) + (10.0 * cc1sq))));
                    satrec.t5cof = 0.2 * (
                        (3.0 * satrec.d4)
                        + (12.0 * satrec.cc1 * satrec.d3)
                        + (6.0 * satrec.d2 * satrec.d2)
                        + (15.0 * cc1sq * ((2.0 * satrec.d2) + cc1sq))
                        );
                }

                /* finally propogate to zero epoch to initialize all others. */
                // sgp4fix take out check to let satellites process until they are actually below earth surface
                // if(satrec.error == 0)
            }

            Sgp4 sgp4 = new Sgp4();

            sgp4.sgp4(satrec, 0);

            satrec.init = 'n';

            /* eslint-enable no-param-reassign */
        }
Ejemplo n.º 2
0
        /*-----------------------------------------------------------------------------
         *
         *                           procedure dscom
         *
         *  this procedure provides deep space common items used by both the secular
         *    and periodics subroutines.  input is provided as shown. this routine
         *    used to be called dpper, but the functions inside weren't well organized.
         *
         *  author        : david vallado                  719-573-2600   28 jun 2005
         *
         *  inputs        :
         *    epoch       -
         *    ep          - eccentricity
         *    argpp       - argument of perigee
         *    tc          -
         *    inclp       - inclination
         *    nodep       - right ascension of ascending node
         *    np          - mean motion
         *
         *  outputs       :
         *    sinim  , cosim  , sinomm , cosomm , snodm  , cnodm
         *    day         -
         *    e3          -
         *    ee2         -
         *    em          - eccentricity
         *    emsq        - eccentricity squared
         *    gam         -
         *    peo         -
         *    pgho        -
         *    pho         -
         *    pinco       -
         *    plo         -
         *    rtemsq      -
         *    se2, se3         -
         *    sgh2, sgh3, sgh4        -
         *    sh2, sh3, si2, si3, sl2, sl3, sl4         -
         *    s1, s2, s3, s4, s5, s6, s7          -
         *    ss1, ss2, ss3, ss4, ss5, ss6, ss7, sz1, sz2, sz3         -
         *    sz11, sz12, sz13, sz21, sz22, sz23, sz31, sz32, sz33        -
         *    xgh2, xgh3, xgh4, xh2, xh3, xi2, xi3, xl2, xl3, xl4         -
         *    nm          - mean motion
         *    z1, z2, z3, z11, z12, z13, z21, z22, z23, z31, z32, z33         -
         *    zmol        -
         *    zmos        -
         *
         *  locals        :
         *    a1, a2, a3, a4, a5, a6, a7, a8, a9, a10         -
         *    betasq      -
         *    cc          -
         *    ctem, stem        -
         *    x1, x2, x3, x4, x5, x6, x7, x8          -
         *    xnodce      -
         *    xnoi        -
         *    zcosg  , zsing  , zcosgl , zsingl , zcosh  , zsinh  , zcoshl , zsinhl ,
         *    zcosi  , zsini  , zcosil , zsinil ,
         *    zx          -
         *    zy          -
         *
         *  coupling      :
         *    none.
         *
         *  references    :
         *    hoots, roehrich, norad spacetrack report #3 1980
         *    hoots, norad spacetrack report #6 1986
         *    hoots, schumacher and glover 2004
         *    vallado, crawford, hujsak, kelso  2006
         * ----------------------------------------------------------------------------*/

        public DscomResult dscom(DscomOptions dscomOptions)
        {
            Globals globals = new Globals();
            double  twoPi   = globals.twoPi;

            double epoch = dscomOptions.epoch;
            double ep    = dscomOptions.ep;
            double argpp = dscomOptions.argpp;
            double tc    = dscomOptions.tc;
            double inclp = dscomOptions.inclp;
            double nodep = dscomOptions.nodep;
            double np    = dscomOptions.np;

            double a1    = 0.0;
            double a2    = 0.0;
            double a3    = 0.0;
            double a4    = 0.0;
            double a5    = 0.0;
            double a6    = 0.0;
            double a7    = 0.0;
            double a8    = 0.0;
            double a9    = 0.0;
            double a10   = 0.0;
            double cc    = 0.0;
            double x1    = 0.0;
            double x2    = 0.0;
            double x3    = 0.0;
            double x4    = 0.0;
            double x5    = 0.0;
            double x6    = 0.0;
            double x7    = 0.0;
            double x8    = 0.0;
            double zcosg = 0.0;
            double zsing = 0.0;
            double zcosh = 0.0;
            double zsinh = 0.0;
            double zcosi = 0.0;
            double zsini = 0.0;

            double ss1  = 0.0;
            double ss2  = 0.0;
            double ss3  = 0.0;
            double ss4  = 0.0;
            double ss5  = 0.0;
            double ss6  = 0.0;
            double ss7  = 0.0;
            double sz1  = 0.0;
            double sz2  = 0.0;
            double sz3  = 0.0;
            double sz11 = 0.0;
            double sz12 = 0.0;
            double sz13 = 0.0;
            double sz21 = 0.0;
            double sz22 = 0.0;
            double sz23 = 0.0;
            double sz31 = 0.0;
            double sz32 = 0.0;
            double sz33 = 0.0;
            double s1   = 0.0;
            double s2   = 0.0;
            double s3   = 0.0;
            double s4   = 0.0;
            double s5   = 0.0;
            double s6   = 0.0;
            double s7   = 0.0;
            double z1   = 0.0;
            double z2   = 0.0;
            double z3   = 0.0;
            double z11  = 0.0;
            double z12  = 0.0;
            double z13  = 0.0;
            double z21  = 0.0;
            double z22  = 0.0;
            double z23  = 0.0;
            double z31  = 0.0;
            double z32  = 0.0;
            double z33  = 0.0;

            // -------------------------- ants -------------------------
            double zes    = 0.01675;
            double zel    = 0.05490;
            double c1ss   = 2.9864797e-6;
            double c1l    = 4.7968065e-7;
            double zsinis = 0.39785416;
            double zcosis = 0.91744867;
            double zcosgs = 0.1945905;
            double zsings = -0.98088458;

            //  --------------------- local variables ------------------------
            double nm     = np;
            double em     = ep;
            double snodm  = Math.Sin(nodep);
            double cnodm  = Math.Cos(nodep);
            double sinomm = Math.Sin(argpp);
            double cosomm = Math.Cos(argpp);
            double sinim  = Math.Sin(inclp);
            double cosim  = Math.Cos(inclp);
            double emsq   = em * em;
            double betasq = 1.0 - emsq;
            double rtemsq = Math.Sqrt(betasq);

            //  ----------------- initialize lunar solar terms ---------------
            double peo    = 0.0;
            double pinco  = 0.0;
            double plo    = 0.0;
            double pgho   = 0.0;
            double pho    = 0.0;
            double day    = epoch + 18261.5 + (tc / 1440.0);
            double xnodce = (4.5236020 - (9.2422029e-4 * day)) % twoPi;
            double stem   = Math.Sin(xnodce);
            double ctem   = Math.Cos(xnodce);
            double zcosil = 0.91375164 - (0.03568096 * ctem);
            double zsinil = Math.Sqrt(1.0 - (zcosil * zcosil));
            double zsinhl = (0.089683511 * stem) / zsinil;
            double zcoshl = Math.Sqrt(1.0 - (zsinhl * zsinhl));
            double gam    = 5.8351514 + (0.0019443680 * day);
            double zx     = (0.39785416 * stem) / zsinil;
            double zy     = (zcoshl * ctem) + (0.91744867 * zsinhl * stem);

            zx  = Math.Atan2(zx, zy);
            zx += gam - xnodce;
            double zcosgl = Math.Cos(zx);
            double zsingl = Math.Sin(zx);

            //  ------------------------- do solar terms ---------------------
            zcosg = zcosgs;
            zsing = zsings;
            zcosi = zcosis;
            zsini = zsinis;
            zcosh = cnodm;
            zsinh = snodm;
            cc    = c1ss;
            double xnoi = 1.0 / nm;

            double lsflg = 0;

            while (lsflg < 2)
            {
                lsflg += 1;
                a1     = (zcosg * zcosh) + (zsing * zcosi * zsinh);
                a3     = (-zsing * zcosh) + (zcosg * zcosi * zsinh);
                a7     = (-zcosg * zsinh) + (zsing * zcosi * zcosh);
                a8     = zsing * zsini;
                a9     = (zsing * zsinh) + (zcosg * zcosi * zcosh);
                a10    = zcosg * zsini;
                a2     = (cosim * a7) + (sinim * a8);
                a4     = (cosim * a9) + (sinim * a10);
                a5     = (-sinim * a7) + (cosim * a8);
                a6     = (-sinim * a9) + (cosim * a10);

                x1 = (a1 * cosomm) + (a2 * sinomm);
                x2 = (a3 * cosomm) + (a4 * sinomm);
                x3 = (-a1 * sinomm) + (a2 * cosomm);
                x4 = (-a3 * sinomm) + (a4 * cosomm);
                x5 = a5 * sinomm;
                x6 = a6 * sinomm;
                x7 = a5 * cosomm;
                x8 = a6 * cosomm;

                z31 = (12.0 * x1 * x1) - (3.0 * x3 * x3);
                z32 = (24.0 * x1 * x2) - (6.0 * x3 * x4);
                z33 = (12.0 * x2 * x2) - (3.0 * x4 * x4);

                z1 = (3.0 * ((a1 * a1) + (a2 * a2))) + (z31 * emsq);
                z2 = (6.0 * ((a1 * a3) + (a2 * a4))) + (z32 * emsq);
                z3 = (3.0 * ((a3 * a3) + (a4 * a4))) + (z33 * emsq);

                z11 = (-6.0 * a1 * a5)
                      + (emsq * ((-24.0 * x1 * x7) - (6.0 * x3 * x5)));
                z12 = (-6.0 * ((a1 * a6) + (a3 * a5)))
                      + (emsq * ((-24.0 * ((x2 * x7) + (x1 * x8))) + (-6.0 * ((x3 * x6) + (x4 * x5)))));

                z13 = (-6.0 * a3 * a6)
                      + (emsq * ((-24.0 * x2 * x8) - (6.0 * x4 * x6)));

                z21 = (6.0 * a2 * a5)
                      + (emsq * ((24.0 * x1 * x5) - (6.0 * x3 * x7)));
                z22 = (6.0 * ((a4 * a5) + (a2 * a6)))
                      + (emsq * ((24.0 * ((x2 * x5) + (x1 * x6))) - (6.0 * ((x4 * x7) + (x3 * x8)))));
                z23 = (6.0 * a4 * a6)
                      + (emsq * ((24.0 * x2 * x6) - (6.0 * x4 * x8)));

                z1 = z1 + z1 + (betasq * z31);
                z2 = z2 + z2 + (betasq * z32);
                z3 = z3 + z3 + (betasq * z33);
                s3 = cc * xnoi;
                s2 = (-0.5 * s3) / rtemsq;
                s4 = s3 * rtemsq;
                s1 = -15.0 * em * s4;
                s5 = (x1 * x3) + (x2 * x4);
                s6 = (x2 * x3) + (x1 * x4);
                s7 = (x2 * x4) - (x1 * x3);

                //  ----------------------- do lunar terms -------------------
                if (lsflg == 1)
                {
                    ss1   = s1;
                    ss2   = s2;
                    ss3   = s3;
                    ss4   = s4;
                    ss5   = s5;
                    ss6   = s6;
                    ss7   = s7;
                    sz1   = z1;
                    sz2   = z2;
                    sz3   = z3;
                    sz11  = z11;
                    sz12  = z12;
                    sz13  = z13;
                    sz21  = z21;
                    sz22  = z22;
                    sz23  = z23;
                    sz31  = z31;
                    sz32  = z32;
                    sz33  = z33;
                    zcosg = zcosgl;
                    zsing = zsingl;
                    zcosi = zcosil;
                    zsini = zsinil;
                    zcosh = (zcoshl * cnodm) + (zsinhl * snodm);
                    zsinh = (snodm * zcoshl) - (cnodm * zsinhl);
                    cc    = c1l;
                }
            }

            double zmol = (4.7199672 + ((0.22997150 * day) - gam)) % twoPi;
            double zmos = (6.2565837 + (0.017201977 * day)) % twoPi;

            //  ------------------------ do solar terms ----------------------
            double se2  = 2.0 * ss1 * ss6;
            double se3  = 2.0 * ss1 * ss7;
            double si2  = 2.0 * ss2 * sz12;
            double si3  = 2.0 * ss2 * (sz13 - sz11);
            double sl2  = -2.0 * ss3 * sz2;
            double sl3  = -2.0 * ss3 * (sz3 - sz1);
            double sl4  = -2.0 * ss3 * (-21.0 - (9.0 * emsq)) * zes;
            double sgh2 = 2.0 * ss4 * sz32;
            double sgh3 = 2.0 * ss4 * (sz33 - sz31);
            double sgh4 = -18.0 * ss4 * zes;
            double sh2  = -2.0 * ss2 * sz22;
            double sh3  = -2.0 * ss2 * (sz23 - sz21);

            //  ------------------------ do lunar terms ----------------------
            double ee2  = 2.0 * s1 * s6;
            double e3   = 2.0 * s1 * s7;
            double xi2  = 2.0 * s2 * z12;
            double xi3  = 2.0 * s2 * (z13 - z11);
            double xl2  = -2.0 * s3 * z2;
            double xl3  = -2.0 * s3 * (z3 - z1);
            double xl4  = -2.0 * s3 * (-21.0 - (9.0 * emsq)) * zel;
            double xgh2 = 2.0 * s4 * z32;
            double xgh3 = 2.0 * s4 * (z33 - z31);
            double xgh4 = -18.0 * s4 * zel;
            double xh2  = -2.0 * s2 * z22;
            double xh3  = -2.0 * s2 * (z23 - z21);

            DscomResult dscomResult = new DscomResult();

            dscomResult.snodm  = snodm;
            dscomResult.cnodm  = cnodm;
            dscomResult.sinim  = sinim;
            dscomResult.cosim  = cosim;
            dscomResult.sinomn = sinomm;

            dscomResult.cosomm = cosomm;
            dscomResult.day    = day;
            dscomResult.e3     = e3;
            dscomResult.ee2    = ee2;
            dscomResult.em     = em;

            dscomResult.emsq = emsq;
            dscomResult.gam  = gam;
            dscomResult.peo  = peo;
            dscomResult.pgho = pgho;
            dscomResult.pho  = pho;

            dscomResult.pinco  = pinco;
            dscomResult.plo    = plo;
            dscomResult.rtemsq = rtemsq;
            dscomResult.se2    = se2;
            dscomResult.se3    = se3;

            dscomResult.sgh2 = sgh2;
            dscomResult.sgh3 = sgh3;
            dscomResult.sgh4 = sgh4;
            dscomResult.sh2  = sh2;
            dscomResult.sh3  = sh3;

            dscomResult.si2 = si2;
            dscomResult.si2 = si3;
            dscomResult.sl2 = sl2;
            dscomResult.sl3 = sl3;
            dscomResult.sl4 = sl4;

            dscomResult.s1 = s1;
            dscomResult.s2 = s2;
            dscomResult.s3 = s3;
            dscomResult.s4 = s4;
            dscomResult.s5 = s5;

            dscomResult.s6  = s6;
            dscomResult.s7  = s7;
            dscomResult.ss1 = ss1;
            dscomResult.ss2 = ss2;
            dscomResult.ss3 = ss3;

            dscomResult.ss4 = ss4;
            dscomResult.ss5 = ss5;
            dscomResult.ss6 = ss6;
            dscomResult.ss7 = ss7;
            dscomResult.sz1 = sz1;

            dscomResult.sz2  = sz2;
            dscomResult.sz3  = sz3;
            dscomResult.sz11 = sz11;
            dscomResult.sz12 = sz12;
            dscomResult.sz13 = sz13;

            dscomResult.sz21 = sz21;
            dscomResult.sz22 = sz22;
            dscomResult.sz23 = sz23;
            dscomResult.sz31 = sz31;
            dscomResult.sz32 = sz32;

            dscomResult.sz33 = sz33;
            dscomResult.xgh2 = xgh2;
            dscomResult.xgh3 = xgh3;
            dscomResult.xgh4 = xgh4;
            dscomResult.xh2  = xh2;

            dscomResult.xh3 = xh3;
            dscomResult.xi2 = xi2;
            dscomResult.xi3 = xi3;
            dscomResult.xl2 = xl2;
            dscomResult.xl3 = xl3;

            dscomResult.xl4 = xl4;
            dscomResult.nm  = nm;
            dscomResult.z1  = z1;
            dscomResult.z2  = z2;
            dscomResult.z3  = z3;

            dscomResult.z11 = z11;
            dscomResult.z12 = z12;
            dscomResult.z13 = z13;
            dscomResult.z21 = z21;
            dscomResult.z21 = z22;

            dscomResult.z23  = z23;
            dscomResult.z31  = z31;
            dscomResult.z32  = z32;
            dscomResult.z33  = z33;
            dscomResult.zmol = zmol;

            dscomResult.zmos = zmos;

            return(dscomResult);
        }