99 GPS C/A PRN Generator
99 : GPS C/A PRN Generator
- Author: Adam Greig
- Description: Generate the GPS C/A PRN sequences PRN1 through PRN32
- GitHub repository
- Open in 3D viewer
- Clock: 1000 Hz
How it works
Two LFSRs are constructed per the GPS ICD, and the first is added to selected taps of the second to produce the selected final PRN sequence.
How to test
With io_in[2:7] set to 2 to select PRN2, reset and then drive the clock; the output sequence on io_out[2] will start with 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1.
External hardware
None
IO
| # | Input | Output |
|---|---|---|
| 0 | clock | G1 |
| 1 | reset | G2 |
| 2 | prn[0] | Selected PRN |
| 3 | prn[1] | |
| 4 | prn[2] | |
| 5 | prn[3] | |
| 6 | prn[4] | |
| 7 |