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针对舰载参考站的移动特性提出了海基联合精密进近着陆(舰)系统(JPALS)的多参考一致性检验(MRCC)算法。首先,利用舰船上的惯导系统输出的姿态信息和舰船尺寸测量数据,将每个参考站的原始伪距和载波相位观测量从其天线位置转换到舰船参考点上;然后,对转换后的各参考站几何无关组合观测量进行均值滤波,得到其宽巷模糊度估计值;最后,计算转换后的各原始观测量和宽巷模糊度估计值的B值。在无故障情况下,这些测量值的B值分布在一定范围(阈值)内,但在参考站故障、严重多径或无线电干扰等情形下,B值可能超出阈值。通过模拟实验采集数据,并计算B值幅度和阈值,结果表明,通常情况下各观测量的B值幅度很小,当某个参考站的接收测量值出现异常时,可以检测到其B值超过阈值。研究表明,该算法满足海基JPALS的多参考一致性检验完好性风险指标要求。
Aiming at the mobile characteristics of shipborne reference station, a Multi-Reference Consistency Check (MRCC) algorithm based on JPALS (Sea-based Joint Precision Approach Landing) system is proposed. Firstly, the original pseudoranges and carrier phase observations of each reference station are converted from their antenna positions to the ship reference points by using attitude information and ship size measurement data from the inertial navigation system on the ship. Then, After the conversion, the geometrically uncorrelated combined observations of each reference station are averaged to obtain the wide-channel ambiguity estimation value. Finally, the B values of the converted original observations and the wide-lane ambiguity estimation value are calculated. The B values for these measurements are distributed within a certain range (threshold) in the absence of a fault condition, but the B value may exceed the threshold in the case of a reference station failure, severe multipath or radio interference. Data were collected through simulation experiments and the amplitude and threshold of B value were calculated. The results show that under normal circumstances, the B value of each observation is very small. When the received measurement value of a reference station is abnormal, it can detect that the value of B exceeds Threshold. The research shows that the algorithm meets the requirements of the sea-based JPALS to test the integrity risk indicators of multiple reference consistency.