Real-time orbit determination simulations were conducted using the space-borne GPS/BDS (BeiDou navigation satellite system) receiver developed for the ZDPS-3 mission. The orbit determination performance based on BDS, especially the B3 frequency, was evaluated. As results, with the higher chip rate, the anti-noise performance of pseudo-noise code of B3 was obviously better than that of B1, which can be utilized to achieve a better orbit determination accuracy. Based on the establishment of the observation model and the orbit determination algorithm model, a hardware-in-loop simulation experimental platform was established after the quality of the receiver’s field observation data was evaluated. The simulation results show that, under the same conditions, the real-time orbit determination accuracy of the B3 frequency is better than that of B1, and comparable to that of GPS in full operation.
Fig.1Photo and block diagram of GNSS receiver prototype for ZDPS-3
信号
f/MHz
fc/ Mcps
信号
f/MHz
fc/ Mcps
B1I
1561.098
2.046
L1 C/A
1575.42
1.023
B3I
1268.52
10.23
L2C
1227.60
1.023
Tab.1Supported frequencies of the receiver for ZDPS-3
Fig.2Double difference pseudorange observation for BDS
Fig.3Double difference pseudorange observation for GPS
参数
设置值
参数
设置值
$a$
6 907 395.5 m
$\varOmega $
115.5611°
$e$
0.001163
$\omega $
128.1038°
$i$
97.4304°
$M$
76.7532°
Tab.2Orbit parameters of low-orbit satellite
Fig.4Hardware-in-loop simulation platform
Fig.5Flow chart for simulation of GPS/BDS orbit determination
双频伪距组合
RMS/m
X轴
Y轴
Z轴
三轴
BDS
1.88
10.04
3.88
10.92
GPS
3.49
7.45
3.79
9.06
Tab.3Root mean square statistics of orbit determination
Fig.6Real-time orbit determination results of dual frequency pseudorange combination
Fig.7Statistics of GDOP
双频伪距组合
RMS/m
X轴
Y轴
Z轴
三轴
B1
0.72
3.77
1.45
4.10
B3
0.83
2.47
0.99
2.79
Tab.4Root mean square statistics of orbit determination for BDS
双频伪距组合
RMS/m
X轴
Y轴
Z轴
三轴
L1
1.21
1.33
1.72
2.49
L2
1.34
1.47
1.73
2.64
Tab.5Root mean square statistics of orbit determination for GPS
Fig.8Real-time orbit determination results of GRAPHIC for BDS
Fig.9Real-time orbit determination results of GRAPHIC for GPS
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