Exemple #1
0
        public string[] Decode(byte[] DataBlockBuffer, string Time, out int NumOfMessagesDecoded)
        {
            // Define output data buffer
            string[] DataOut = new string[2000];

            // Determine the size of the datablock
            int LengthOfDataBlockInBytes = DataBlockBuffer.Length;

            // Index into the array of record strings
            int DataOutIndex = 0;

            // Reset buffer indexes
            CurrentDataBufferOctalIndex = 0;
            int DataBufferIndexForThisExtraction = 0;

            // SIC/SAC Indexes
            int SIC_Index = 0;
            int SAC_Index = 0;

            // Lenght of the current record's FSPECs
            int FSPEC_Length = 0;

            // The first four possible FSPEC octets
            BitVector32 FourFSPECOctets = new BitVector32();

            // The fifth FSPEC octet in the case RE or SP field is present
            BitVector32 TheFifthFSPECOctet = new BitVector32();

            while (DataBufferIndexForThisExtraction < LengthOfDataBlockInBytes)
            {
                // Assume that there will be no more than 200 bytes in one record
                byte[] LocalSingleRecordBuffer = new byte[3000];

                Array.Copy(DataBlockBuffer, DataBufferIndexForThisExtraction, LocalSingleRecordBuffer, 0, (LengthOfDataBlockInBytes - DataBufferIndexForThisExtraction));

                // Get all four data words, but use only the number specifed
                // by the length of FSPEC words
                FourFSPECOctets    = ASTERIX.GetFourFSPECOctets(LocalSingleRecordBuffer);
                TheFifthFSPECOctet = ASTERIX.GetFifthFSPECOctet(LocalSingleRecordBuffer);


                // Determine Length of FSPEC fields in bytes
                FSPEC_Length = ASTERIX.DetermineLenghtOfFSPEC(LocalSingleRecordBuffer);

                // Check wether 010 is present
                if (FourFSPECOctets[Bit_Ops.Bit7] == true)
                {
                    // Determine SIC/SAC Index
                    SIC_Index = FSPEC_Length;
                    SAC_Index = SIC_Index + 1;

                    // Extract SIC/SAC Indexes.
                    DataOut[DataOutIndex] = LocalSingleRecordBuffer[SIC_Index].ToString() + '/' + LocalSingleRecordBuffer[SAC_Index].ToString();

                    // Save of the current data buffer index so it can be used by
                    // Decoder
                    CurrentDataBufferOctalIndex = SAC_Index + 1;
                }
                else
                {
                    // Extract SIC/SAC Indexes.
                    DataOut[DataOutIndex] = "---" + '/' + "---";
                }

                ///////////////////////////////////////////////////////////////////////////
                // Populate the current SIC/SAC and Time stamp for this meesage
                //
                I062DataItems[ItemIDToIndex("010")].value =
                    new ASTERIX.SIC_SAC_Time(LocalSingleRecordBuffer[SIC_Index], LocalSingleRecordBuffer[SAC_Index], ASTERIX.TimeOfReception);

                // Loop for each FSPEC and determine what data item is present
                for (int FSPEC_Index = 1; FSPEC_Index <= FSPEC_Length; FSPEC_Index++)
                {
                    switch (FSPEC_Index)
                    {
                    case 1:

                        // 010 Data Source Identifier
                        if (FourFSPECOctets[Bit_Ops.Bit7] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  010:T";
                            I062DataItems[ItemIDToIndex("010")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("010")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  010:F";
                            I062DataItems[ItemIDToIndex("010")].CurrentlyPresent = false;
                        }

                        // Spare bit
                        if (FourFSPECOctets[Bit_Ops.Bit6] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  SPR:T";
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  SPR:F";
                        }

                        // 015 Service Identification
                        if (FourFSPECOctets[Bit_Ops.Bit5] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  015:T";
                            I062DataItems[ItemIDToIndex("015")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("015")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  015:F";
                            I062DataItems[ItemIDToIndex("015")].CurrentlyPresent = false;
                        }

                        // 070 Time Of Track Information
                        if (FourFSPECOctets[Bit_Ops.Bit4] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  070:T";
                            I062DataItems[ItemIDToIndex("070")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("070")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  070:F";
                            I062DataItems[ItemIDToIndex("070")].CurrentlyPresent = false;
                        }

                        // 105 Calculated Track Position (WGS-84)
                        if (FourFSPECOctets[Bit_Ops.Bit3] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  105:T";
                            I062DataItems[ItemIDToIndex("105")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("105")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  105:F";
                            I062DataItems[ItemIDToIndex("105")].CurrentlyPresent = false;
                        }

                        // 100 Calculated Track Position (Cartesian)
                        if (FourFSPECOctets[Bit_Ops.Bit2] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  100:T";
                            I062DataItems[ItemIDToIndex("100")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("100")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  100:F";
                            I062DataItems[ItemIDToIndex("100")].CurrentlyPresent = false;
                        }

                        // 185 Calculated Track Velocity (Cartesian)
                        if (FourFSPECOctets[Bit_Ops.Bit1] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  185:T";
                            I062DataItems[ItemIDToIndex("185")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("185")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  185:F";
                            I062DataItems[ItemIDToIndex("185")].CurrentlyPresent = false;
                        }

                        break;

                    case 2:

                        // 210 Calculated Acceleration (Cartesian)
                        if (FourFSPECOctets[Bit_Ops.Bit15] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  210:T";
                            I062DataItems[ItemIDToIndex("210")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("210")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  210:F";
                            I062DataItems[ItemIDToIndex("210")].CurrentlyPresent = false;
                        }

                        // 060 Track Mode 3/A Code
                        if (FourFSPECOctets[Bit_Ops.Bit14] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  060:T";
                            I062DataItems[ItemIDToIndex("060")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("060")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  060:F";
                            I062DataItems[ItemIDToIndex("060")].CurrentlyPresent = false;
                        }

                        // 245 Target Identification
                        if (FourFSPECOctets[Bit_Ops.Bit13] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  245:T";
                            I062DataItems[ItemIDToIndex("245")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("245")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  245:F";
                            I062DataItems[ItemIDToIndex("245")].CurrentlyPresent = false;
                        }

                        // 380 Aircraft Derived Data
                        if (FourFSPECOctets[Bit_Ops.Bit12] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  380:T";
                            I062DataItems[ItemIDToIndex("380")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("380")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  380:F";
                            I062DataItems[ItemIDToIndex("380")].CurrentlyPresent = false;
                        }

                        // 040 Track Number
                        if (FourFSPECOctets[Bit_Ops.Bit11] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  040:T";
                            I062DataItems[ItemIDToIndex("040")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("040")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  040:F";
                            I062DataItems[ItemIDToIndex("040")].CurrentlyPresent = false;
                        }

                        // 080 Track Status
                        if (FourFSPECOctets[Bit_Ops.Bit10] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  080:T";
                            I062DataItems[ItemIDToIndex("080")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("080")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  080:F";
                            I062DataItems[ItemIDToIndex("080")].CurrentlyPresent = false;
                        }

                        // 290 System Track Update Ages
                        if (FourFSPECOctets[Bit_Ops.Bit9] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  290:T";
                            I062DataItems[ItemIDToIndex("290")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("290")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  290:F";
                            I062DataItems[ItemIDToIndex("290")].CurrentlyPresent = false;
                        }

                        break;

                    case 3:

                        // 200 Mode of Movement
                        if (FourFSPECOctets[Bit_Ops.Bit23] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  200:T";
                            I062DataItems[ItemIDToIndex("200")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("200")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  200:F";
                            I062DataItems[ItemIDToIndex("200")].CurrentlyPresent = false;
                        }

                        // 295 Track Data Ages
                        if (FourFSPECOctets[Bit_Ops.Bit22] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  295:T";
                            I062DataItems[ItemIDToIndex("295")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("295")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  295:F";
                            I062DataItems[ItemIDToIndex("295")].CurrentlyPresent = false;
                        }

                        // 136 Measured Flight Level
                        if (FourFSPECOctets[Bit_Ops.Bit21] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  136:T";
                            I062DataItems[ItemIDToIndex("136")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("136")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  136:F";
                            I062DataItems[ItemIDToIndex("136")].CurrentlyPresent = false;
                        }

                        // 130 Calculated Track Geometric Altitude
                        if (FourFSPECOctets[Bit_Ops.Bit20] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  130:T";
                            I062DataItems[ItemIDToIndex("130")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("130")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  130:F";
                            I062DataItems[ItemIDToIndex("130")].CurrentlyPresent = false;
                        }

                        // 135 Calculated Track Barometric Altitude
                        if (FourFSPECOctets[Bit_Ops.Bit19] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  135:T";
                            I062DataItems[ItemIDToIndex("135")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("135")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  135:F";
                            I062DataItems[ItemIDToIndex("135")].CurrentlyPresent = false;
                        }

                        // 220 Calculated Rate Of Climb/Descent
                        if (FourFSPECOctets[Bit_Ops.Bit18] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  220:T";
                            I062DataItems[ItemIDToIndex("220")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("220")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  220:F";
                            I062DataItems[ItemIDToIndex("220")].CurrentlyPresent = false;
                        }


                        // 390 Flight Plan Related Data
                        if (FourFSPECOctets[Bit_Ops.Bit17] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  390:T";
                            I062DataItems[ItemIDToIndex("390")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("390")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  390:F";
                            I062DataItems[ItemIDToIndex("390")].CurrentlyPresent = false;
                        }

                        break;


                    case 4:

                        // 270 Target Size & Orientation
                        if (FourFSPECOctets[Bit_Ops.Bit31] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  270:T";
                            I062DataItems[ItemIDToIndex("270")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("270")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  270:F";
                            I062DataItems[ItemIDToIndex("270")].CurrentlyPresent = false;
                        }

                        // 300 Vehicle Fleet Identification
                        if (FourFSPECOctets[Bit_Ops.Bit30] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  300:T";
                            I062DataItems[ItemIDToIndex("300")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("300")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  300:F";
                            I062DataItems[ItemIDToIndex("300")].CurrentlyPresent = false;
                        }

                        // 110 Mode 5 Data reports & Extended Mode 1 Code
                        if (FourFSPECOctets[Bit_Ops.Bit29] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  110:T";
                            I062DataItems[ItemIDToIndex("110")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("110")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  110:F";
                            I062DataItems[ItemIDToIndex("110")].CurrentlyPresent = false;
                        }

                        // 120 Track Mode 2 Code
                        if (FourFSPECOctets[Bit_Ops.Bit28] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  120:T";
                            I062DataItems[ItemIDToIndex("120")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("120")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  120:F";
                            I062DataItems[ItemIDToIndex("120")].CurrentlyPresent = false;
                        }

                        // 510 Composed Track Number
                        if (FourFSPECOctets[Bit_Ops.Bit27] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  510:T";
                            I062DataItems[ItemIDToIndex("510")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("510")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  510:F";
                            I062DataItems[ItemIDToIndex("510")].CurrentlyPresent = false;
                        }

                        // 500 Estimated Accuracies
                        if (FourFSPECOctets[Bit_Ops.Bit26] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  500:T";
                            I062DataItems[ItemIDToIndex("500")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("500")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  500:F";
                            I062DataItems[ItemIDToIndex("500")].CurrentlyPresent = false;
                        }

                        // 340 Measured Information
                        if (FourFSPECOctets[Bit_Ops.Bit25] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  340:T";
                            I062DataItems[ItemIDToIndex("340")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("340")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  340:F";
                            I062DataItems[ItemIDToIndex("340")].CurrentlyPresent = false;
                        }

                        break;

                    // These are Reserved Expansion and Special Purpose fileds.
                    case 5:

                        // RE Reserved Expansion Field
                        if (TheFifthFSPECOctet[Bit_Ops.Bit2] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  REF:T";
                            I062DataItems[ItemIDToIndex("REF")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("REF")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  REF:F";
                            I062DataItems[ItemIDToIndex("REF")].CurrentlyPresent = false;
                        }

                        // SP Special Purpose Indicator
                        if (TheFifthFSPECOctet[Bit_Ops.Bit1] == true)
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  SPI:T";
                            I062DataItems[ItemIDToIndex("SPI")].HasBeenPresent   = true;
                            I062DataItems[ItemIDToIndex("SPI")].CurrentlyPresent = true;
                        }
                        else
                        {
                            DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  SPI:F";
                            I062DataItems[ItemIDToIndex("SPI")].CurrentlyPresent = false;
                        }

                        break;

                    // Handle errors
                    default:
                        DataOut[DataOutIndex] = DataOut[DataOutIndex] + "  UKN:T";
                        break;
                    }
                }

                DataOutIndex++;
                CAT62DecodeAndStore.Do(LocalSingleRecordBuffer);
                DataBufferIndexForThisExtraction = DataBufferIndexForThisExtraction + CurrentDataBufferOctalIndex;
            }

            // Return decoded data
            NumOfMessagesDecoded = DataOutIndex;
            return(DataOut);
        }