B1C RF characteristics of the BDSBAS GEO-1, GEO-2 and GEO-3
| No. | Item | ICAO requirements | GEO-1 RF characteristics | GEO-2 RF characteristics | GEO-3 RF characteristics |
|---|---|---|---|---|---|
| 1. | Carrier frequency | 1575.42MHz | 1575.42MHz | 1575.42MHz | 1575.42MH |
| 2. | Spurious | ≤-40dBc | -56.66 dBc | -62.52 dBc | -58.34 dBc |
| 3. | Modulation | BPSK (1) symbol rate 500sps code length 1,023 Chip rate 1.023Mchip/s | BPSK (1) symbol rate 500sps code length 1,023 Chip rate 1.023Mchip/s | BPSK (1) symbol rate 500sps code length 1,023 Chip rate 1.023Mchip/s | BPSK (1) symbol rate 500sps code length 1,023 Chip rate 1.023Mchip/s |
| 4. | Phase noise | PLL of 10 Hz one-sided noise bandwidth is able to track the carrier with an accuracy of 0.1 radian | 0.00578 rad | 0.00630 rad | 0.00598 rad |
| 5. | Spectrum | At least 95% of the broadcast power will be contained within 12 MHz bandwidth | Band wide: ±18.414MHz | Band wide: ±18.414MHz | Band wide: ±18.414MHz |
| 6. | Frequency stability | <5e-11(1s~10s) | 1.5e-12/1s | 1.37e-12/1s | 1.40e-12/1s |
| 7. | Coherence of Code & Carrier | Short-term: < 0.15m | 0.12m | 0.08m | 0.10m |
| Long-term: < 0.19m | 0.133m | 0.09m | 0.11m | ||
| Long-term: <0.255m | 0.16m | 0.11m | 0.15m | ||
| 8. | Coherent of L1 | Short-term: <0.2m Long-term: <0.255m | Short-term: 0.13m Long-term: 0.178m | Short-term: 0.04m Long-term: 0.078m | Short-term: 0.08m Long-term: 0.103m |