GPS Free Stack/Debug

Off-Line processing

Mainly intended for debugging purposes like off-line processing of the received data, it implement a 8 bits shift register that is stored in a 2k buffer on the fpga, this is currently on the Milkymist SoC, Received data is saved to file on the on-board nor memory, allowing a max sample size of 17Mb to be recorded.

Data is analyzed using an adapted version of the osgps, so far, signals from some gps satellites has been confirmed, but not carrier phase can be tracked.

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  osgps after process raw sample http://downloads.qi-hardware.com/people/kristianpaul/sigeraw_2011_lun30may_21-27hrs.bin

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  visual aid from gpredict simulation in order to identify satellites at the time of the data recording

Note highest state from osgps is just 3.

Debugging

Analyzing signal output from the board in order to verify is signal characterization.

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  Clock and Sync

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  Sync and Data

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  Just Clock Signal

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  Just Sync Signal