// This method returns the index to the first
// byte of the user data after FSPEC, SIC and SAC
// assumes that the first three octets from the data
// block are removed from the buffer
public static int GetFirstDataIndex(byte[] Data)
{
// Determine Length of FSPEC fields in bytes
int FSPEC_Length = ASTERIX.DetermineLenghtOfFSPEC(Data);
// Determine SIC/SAC Index
int SIC_Index = FSPEC_Length;
int SAC_Index = SIC_Index + 1;
return(SAC_Index + 1);
}
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);
}