SCIENTIA SINICA Informationis, Volume 50 , Issue 4 : 603-616(2020) https://doi.org/10.1360/N112018-00269

## Real-time detection and elimination method for BDS signal-in-space anomalies

• AcceptedMar 18, 2019
• PublishedFeb 27, 2020
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### Abstract

The BeiDou navigation satellite system (BDS) signal-in-space anomaly is an important factor affecting the signal-in-space quality assessment. Detecting and excluding signal-in-space anomalies is not only a method for constructing a BDS signal-in-space fault model but can also help ensure the BDS navigation and positioning integrity. Traditional methods, based on post precision ephemeris and broadcast ephemeris, maintain some disadvantages, such as a large delay and a low sampling rate. In this paper, a carrier-phase smoothing pseudorange algorithm based on Kalman filtering is proposed, and a real-time estimation method of a BDS signal-in-space user range error is established to detect and eliminate signal-in-space anomalies in real time, based on the statistical characteristics of signal-in-space user range error. The experimental results, based on 1 Hz data of the international GNSS service (IGS) ground observation network, show that the proposed method has an estimation accuracy of 1.15 m for a BDS signal-in-space user range error, which can effectively identify signal-in-space anomalies caused by satellite orbit and clock faults.

### References

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• Figure 1

(Color online) The radial error of orbit in the case that the antenna phase center offset and variations are not corrected (from top to bottom are the results of GEO satellite C01, IGSO satellite C06, and MEO satellite C11)

• Figure 2

(Color online) The radial error of orbit in the case that the antenna phase center offset and variations are corrected (from top to bottom are the results of GEO satellite C01, IGSO satellite C06, and MEO satellite C11)

• Figure 3

(Color online) Statistical distribution of IURE (from left to right are the results of NNOR, GAMG, JFNG, KRGG, NTUS, and PTGG stations)

• Figure 4

(Color online) IURE histogram (from left to right are the results of GEO satellite C01, IGSO satellite C06, and MEO satellite C11)

• Figure 5

(Color online) The kurtosis and skewness of the IURE distributions

• Figure 6

(Color online) The estimation errors of IURE (from top to bottom are IURE estimation errors using methods (1), (2), and (3))

• Figure 7

(Color online) Using real-time IURE estimation method to detect jumping anomalies caused by orbit faults

• Figure 8

(Color online) Using real-time IURE estimation method to detect anomalies caused by clock failures

• Figure 9

(Color online) Using real-time IURE estimation method to detect anomalies caused by orbit failures

• Table 1   Mean and STD of IURE for all stations (unit: m)
 PRN/type Mean STD PRN/type Mean STD C01 $-$0.84 1.52 C10 $-$1.20 1.21 C02 2.51 1.24 C13 0.32 0.98 C03 0.64 1.73 C11 0.68 0.93 C04 $-$0.43 1.57 C12 0.76 1.05 C05 0.55 1.41 C14 0.98 1.00 C06 $-$1.16 1.14 OC13 0.70 0.98 C07 $-$0.38 0.77 GEO 0.47 1.48 C08 $-$0.66 0.97 IGSO $-$0.72 1.06 C09 $-$1.27 1.04 MEO 0.81 1.03
• Table 2   The RMS values of IURE estimation errors (unit: m)
 Type Method NNOR GAMG JFNG KRGG NTUS PTGG Total GEO (1) 1.36 1.50 1.52 1.30 1.44 1.54 1.44 (2) 1.31 1.45 1.36 1.29 1.44 1.43 1.38 (3) 1.25 1.10 1.29 1.18 1.40 1.41 1.27 IGSO (1) 1.70 1.55 1.56 1.32 0.93 1.34 1.40 (2) 1.52 1.35 1.35 1.27 0.93 1.02 1.24 (3) 1.44 1.17 1.30 1.22 0.87 0.90 1.15 MEO (1) 1.53 1.56 1.45 1.10 1.20 1.23 1.35 (2) 1.16 1.10 1.11 1.04 1.20 0.89 1.08 (3) 1.09 0.88 1.03 0.90 1.17 0.87 0.99 AllSat (1) 1.53 1.54 1.51 1.24 1.19 1.38 1.40 (2) 1.34 1.30 1.28 1.20 1.19 1.13 1.24 (3) 1.27 1.06 1.22 1.10 1.14 1.08 1.15
• Table 3   The STD values of IURE estimation errors (unit: m)
 Type Method NNOR GAMG JFNG KRGG NTUS PTGG Total GEO (1) 0.96 1.04 0.95 0.73 0.35 0.80 0.80 (2) 0.88 0.96 0.69 0.71 0.35 0.58 0.70 (3) 0.77 0.49 0.56 0.52 0.26 0.46 0.51 IGSO (1) 1.55 1.10 1.12 0.69 0.47 1.08 1.00 (2) 1.35 0.82 0.83 0.62 0.47 0.66 0.79 (3) 1.25 0.55 0.72 0.47 0.32 0.39 0.62 MEO (1) 1.41 1.25 1.24 0.71 0.46 0.97 1.01 (2) 0.98 0.68 0.83 0.63 0.46 0.46 0.67 (3) 0.83 0.38 0.73 0.44 0.36 0.36 0.52 AllSat (1) 1.30 1.12 1.09 0.71 0.42 0.95 0.93 (2) 1.07 0.82 0.78 0.65 0.42 0.57 0.72 (3) 0.96 0.48 0.67 0.47 0.31 0.41 0.55

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