海基JPALS的多参考一致性检验算法

Multiple reference consistency check algorithm for sea-based JPALS

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。

According to the characteristics of mobile carrier reference station, a novel multiple reference consistency check （MRCC） algorithm for the sea-based joint precision approach and landing system （JPALS） is proposed. First, the original pseudorange and carrier phase measurement of each reference station are con- verted to the ship reference point by using the attitude information from the inertial navigation system on the ship and the ship size measurement data. Then, the wide lane ambiguity of each reference station is obtained by filtering the converted geometry-free combined observables. Finally, the B-values of these converted meas- urements for each reference station are calculated. Under no fault condition, the B-values of these measure- ments distribute in a certain range, but the B-value may exceed the threshold in the case of reference station fault, severe muhipath or radio interference. Observation data were collected by simulation experiment and then the B-values and their threshold were computed. The results show that generally the B-values of these observa- bles are very small, but when any abnormal from some measurement occurs, it can be detected that the B-value exceeds their threshold. The algorithm satisfies the MRCC integrity risk requirements of the sea-based JPALS.