In your opinion, is it possible for a GPS receiver to align the PPS pulse on multiple of the C/A code repetition rate because of (for example) badly received satellite signals? Maybe this can happen, after the initial acquisition, on the following updates.
On Wed, Feb 1, 2012 at 10:47 AM, <b...@lysator.liu.se> wrote: > > On Tue, 31 Jan 2012 16:29:07 -0800 > > Chris Albertson <albertson.ch...@gmail.com> wrote: > > > >> I'm pretty sure those GPS recievers that send out more frequent data, > >> at say 2Hz or 5Hz are just interpolating. It is not more accurate. > >> The GPS sats only send a frame once over 6 seconds. > > > > As Magnus already wrote, once you have a fix, you can use code tracking > > to get an updated fix up to rates of 1kHz. If you use codeless P(Y) > > code tracking or carrier phase tracking you can get even higher rates. > > > > But, you can only update an already available fix, not calculate > > a fresh fix from scratch at that rate. This is because carrier phase > > and codeless P(Y) code tracking has an ambiguity of the phase, which > > has to be first resolved by a "conventional" fix. Once you have this, > > you can use those two techniques to get fixes at high rates. > > > > Attila Kinali > > > > The classic GPS receiver architecture use early and late correlators to > track the correlation peak. You can make fresh single fix solutions as > quick as your hardware can cope. However the correlator tracking loops > have a limited bandwidth - 5 to 25Hz-ish. It is of limited interest to > sample quicker than some 10-40Hz. > > -- > > Björn > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
