Sapphire pseudocode for coordinate conversions – NavCom Sapphire Rev.J User Manual
Page 395
Sapphire Technical Reference Manual Rev. J
395
}
}
else if( ch is not ascii_char )
{
// Got a 'non-ASCII' character, parse fails
Error handling;
}
else if( crc_count >= 4 )
{
// CRC string is too long
Error handling;
}
else
{
// Save this character on the end of the crc string and
// add null terminator after it.
crc_str[crc_count] = ch;
crc_count++;
crc_str[crc_count] = 0;
}
break;
}// end switch on parse state
// Input character has been processed.
// Check if initial parse has completed or failed.
if( flag PARSE_COMPLETED_OK is set )
{
if(
mnemonic matches “PVT1B” )
{// msg_body holds binary data for PVT1B
Decode msg_body using [PVT1B] format definition
}
}
} // end of LOOP
Sapphire Pseudocode for Coordinate Conversions
This is example source code for properly parsing the LAT|LON|HGHT from the PVT1B
message:
if
( msg.IsNavValid())
{
double
latitude = msg.GetLatitude();
double
longitude = msg.GetLongitude();
double
height = msg.GetHeight();
}
// convert from S32 in arc-seconds scaled to 2^-11
// to R64 as degrees.minutes
R64 CNovaPVT1B::GetLatitude()
{
if
(IsPvtRevision1OrPvtRevision2())
{
R64 xTmp = rev1_latitude;
// convert S32 to R64
xTmp = xTmp / 2048.0;
// convert to arc-seconds
// pull the latitude correction