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Difference between GPS vs IRNSS
| System parameter | IRNSS | GPS |
|---|---|---|
| Carrier center frequency | 1176.45 MHz | 1575.42 MHz |
| Coding scheme | Convolution + Interleaving | Parity check |
| Navigation data rate | 50 sps (50 sps equivalent to 25 bps) | 50 bps |
| System time | IRNSS system time | GPS time |
Position errors on 24 hours of different days
| Position Error (m) | |||
|---|---|---|---|
| Timestamp | May 31st to Jun 01st | Jun 01st to Jun 02st | Jun 02nd to Jun 03rd |
| 08h08 | 33.799 | 26.603 | 24.391 |
| 09h08 | 33.799 | 24.701 | 29.853 |
| 10h08 | 25.282 | 29.419 | 27.301 |
| 11h08 | 24.077 | 30.654 | 26.301 |
| 12h08 | 19.548 | 29.672 | 22.105 |
| 13h08 | 23.021 | 26.279 | 25.620 |
| 14h08 | 26.312 | 28.145 | 29.931 |
| 15h08 | 81.092 | 30.279 | 116.789 |
| 16h08 | 18.969 | 37.771 | 287.028 |
| 17h08 | 16.200 | 26.711 | 34.795 |
| 18h08 | 29.095 | 25.321 | 44.743 |
| 19h08 | 26.686 | 19.269 | 27.064 |
| 20h08 | 27.063 | 16.008 | 21.467 |
| 21h08 | 24.116 | 19.926 | 20.831 |
| 22h08 | 18.608 | 23.237 | 21.786 |
| 23h08 | 19.233 | 19.428 | 13.061 |
| 00h08 | 21.068 | 30.044 | 16.809 |
| 01h08 | 28.057 | 17.627 | 28.040 |
| 02h08 | 22.837 | 28.461 | 29.899 |
| 03h08 | 28.939 | 30.769 | 33.448 |
| 04h08 | 27.689 | 60.949 | 42.273 |
| 05h08 | 23.232 | 30.203 | 26.902 |
| 06h08 | 29.191 | 26.937 | 20.437 |
| 07h08 | 21.802 | 26.068 | 23.469 |
USRP configuration_
| Parameters | Value |
|---|---|
| Output type | Complex int16 |
| Wire Format | Automatic |
| Sync | PC |
| Clock rate | 200 Mhz |
| Input type | short |
| Vector length | 2 |
| Append file | Overwrite |
| Value | 2000000 |
| Gain value | 80 |
| Antenna | TX/RX |
| Center Freq (Hz) | 1176450000 |
| Gain Type | Absolute (dB) |
| Bandwidth (Hz) | 0 |
Common parameters between GPS and IRNSS_
| System parameters | |
|---|---|
| Multiplexing | CDMA |
| Modulation | BPSK |
| Spreading code | Gold-cod 10 bits |
| Chip rate | 1.023 MHz |
| Code length | 1023 chips |
| Code period | 1 millisecond |