Calibrate inter-channel bias in GLONASS/BDS combined pseudorange positioning
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摘要: 由于俄罗斯的GLONASS卫星间频率存在差异，测站硬件延迟误差无法被接收机钟差参数吸收，提出为每颗卫星估计一个通道延迟改正参数的方法，以提升GLONASS/BDS组合伪距定位精度. 实验表明：加入通道延迟改正能有效降低GLONASS定位误差，改正后东(E)、北(N)、天顶(U)方向误差的均方根(RMS)值分别减小了0.43 m、0.69 m、0.73 m，并且改正效果长期有效. 在测站北斗卫星导航系统(BDS)观测效果有限时，GLONASS/BDS双系统组合伪距定位较BDS单系统性能更佳，改正通道延迟后，能进一步提升双系统定位性能，改正后E、N、U方向的误差RMS值分别减小了0.37 m、0.28 m、0.5 m.Abstract: Because of the frequency difference between GLONASS satellites, the hardware bias of the station cannot be absorbed by the receiver clock bias parameter. We presents a method to estimate a inter-channal bias for each satellites to improve the accuracy of combined GLONASS/BDS pseudorange standard point positioning. The solutions show that adding pseudorange ICB calibration can effectively reduce GLONASS positioning error, and the root mean square (RMS) value of east(E), north(N), and up (U) components error after calibration is reduced by 0.43 m, 0.69 m, 0.73 m, respectively, and the calibration effect is long-term effective. When the BeiDou Navigation Satellite System (BDS) observation conditions of the station is limited, the combined GLONASS/BDS pseudorange standard point positioning is effective in improve accuracy positioning. After calibrating inter-channal bias, dual-system positioning accuracy is further improved. And the RMS values of E, N, U components error are reduced by 0.37 m, 0.28 m, and 0.5 m, respectively.
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表 2 卫星与频率对应关系
频率号 同频卫星1 同频卫星2 SLOT/FRQ 1 R08 R04 6 2 R07 R03 5 3 R21 R17 4 4 R23 R19 3 5 R24 R20 2 6 R05 R01 1 7 R15 R11 0 8 R16 R12 −1 9 R13 R09 −2 10 R22 R18 −3 11 R06 R02 −4 12 R14 R10 −7 
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表 3 改正通道延迟前后的定位精度统计
m 通道延迟 误差 E N U 改正前 RMS 10.42 7.58 11.15 $\sigma $ 5.72 6.53 7.42 改正后 RMS 9.99 6.89 10.42 $\sigma $ 4.94 5.69 6.95
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表 4 单系统与双系统定位精度统计
m 卫星系统 误差 E N U BDS RMS 8.40 6.96 8.21 $\sigma $ 8.33 6.94 8.20 GLONASS/BDS RMS 7.84 5.79 8.17 $\sigma $ 5.04 5.51 6.82 改正通道延迟GLOANSNS/BDS RMS 7.47 5.51 7.67 $\sigma $ 4.58 5.21 6.19
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