Brooke, [email protected] skrev: > Hi Magnus: > > The reason F0 = 1.023 MHz is that it's also used as the basis for the data > bit rates. The L1C/A code is 1 ms long @ F0 rate. > The L2CM (Moderate) code will be 20 ms long @ F0/2 > The L2CL (Long) code will be 1.5 sec long @ F0/2, > so maybe F0 should be 511.5 kpbs?
In that case you should be using 50 Hz... since that is the rate of the C/A data modulation. But your reasoning is broken... you are attempting to find even multiplication rates, but this is not the way to get the fundamental frequency. ICD-200 clearly indicates 10,23 MHz. The basic rate of GPS is 10,23 MHz for the P-code. The flimsy C/A code is a 10th of that rate... and L2CM and L2CL is a further division by 2... > I discovered that the Trimble p/n 16768-80 Trimpack GPS receiver has a > graphics capability, which none of the others have, and wanted to know > why. So I'm in the process of reverse engineering and repairing it. > There's still a power supply problem that's making the LCD extreamly hard > to read, but now I know the reason for the graphics is to switch between > English and Arabic for all the displays. > http://www.prc68.com/I/Trimpack.shtml#GraphicsTP > > My interest in the GPS Link frequencies and codes is related to the > Polaris Guide (civilian version of the current military DAGR GPS receiver) > and possible firmware upgrades. I've just got off the phone with Rockwell > and they say the Polaris guide only has L1 capability (I was expecting > that it also had L2 since the DAGR has L2). > http://www.prc68.com/I/DAGR.shtml#Pol Kind of expected. It is only lately that we got any L2C coverage to be meaningfull. Codeless P-code tracking of some sort is still king for civilian uses. Especially with GLONASS added. > I'm in the process of adding a LF differential beacon receiver interface > to the Polaris Guide. Also have the connector on order to add Have Quick > time fill to the O-1814 Rb Time and Frequency standard. > http://www.prc68.com/I/O1814.shtml Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
