I hope this is the right place to ask such a question.
I am trying to encode some RTCM messages and they happen to be using the same parity algorithm as GPS (see section 20.3.5 in IS-GPS-200H; I've got the release form 2013-09-24). The six parity bits are at the end of each word and the calculation of them uses the last two parity bits from the previous word. What to do if this is the first word in your message (i.e. an RTCM header)?
I am struggling to find information on this, every tutorial online seems to skip over this point. The RTCM Recommended Standard for Differential GNSS Service v2.3 simply refers the reader to IS-GPS-200H which does not elucidate this point.
In short - how to calculate parity for the first word of a message in GPS or RTCM messages?
أكثر...
I am trying to encode some RTCM messages and they happen to be using the same parity algorithm as GPS (see section 20.3.5 in IS-GPS-200H; I've got the release form 2013-09-24). The six parity bits are at the end of each word and the calculation of them uses the last two parity bits from the previous word. What to do if this is the first word in your message (i.e. an RTCM header)?
I am struggling to find information on this, every tutorial online seems to skip over this point. The RTCM Recommended Standard for Differential GNSS Service v2.3 simply refers the reader to IS-GPS-200H which does not elucidate this point.
In short - how to calculate parity for the first word of a message in GPS or RTCM messages?
أكثر...