卫星引导自动着舰定位精度估计与终端误差影响

Positioning Accuracy Estimating and Terminal Error of Satellite Guidance Automatic Carrier Landing

摘要:

分析了卫星引导自动着舰在最终进近段的定位精度及对最终着舰性能的影响；针对海基精密进近与着陆系统所采用的两阶段无障碍导航算法，根据着舰进近最终下滑段确定参数典型取值；通过对宽巷组合信号预滤波处理后的整周模糊度和载波相位精度进行计算，结合覆盖导航卫星重访周期的星座形式，对卫星引导导航算法的定位精度得到上界估计；在预滤波时间20min，载波相位精度0.007m，伪距精度0.35m时估计得到的卫星导航性能符合垂直告警限对应完好性要求；基于机上解算卫星引导架构全自动着舰纵向回路闭环仿真分析不同干扰因素对最终着舰性能的影响，在选择适配卫星导航误差特征的引导律滤波器基础上，最终得到着舰点水平偏差统计标准差为6.9288m，其中甲板运动为影响着舰性能的最主要因素。

Abstract:

The positioning accuracy and landing performance of satellite guidance automatic carrier landing during final approaching is investigated. The issue focuses on the two-phase fault-free navigation algorithm of Sea-Based Joint Precision Approach and Landing System. According to the typical parameters during automatic carrier landing, the precision of wide-lane cycle ambiguity after pre-filtering and wide-lane carrier phase from double-frequency differential global position system, are calculated. Based on the simulation covering satellite revisiting period, the upper bound of navigation algorithm positioning precision is estimated. It is concluded that when setting pre-filtering time 20 min, pseudo-range standard error 0.35m, carrier phase standard error 0.007m, the accuracy of Sea-Based Joint Precision Approach and Landing System satisfies the integrity demand corresponding to vertical alert limit. From airborne guidance ACLS closed-loop simulation and design the suitable filter subject to satellite guidance error, the statistical standard deviation of touchdown point horizontal errors is 6.9288m, and the deck motion contributes most in the performance of automatic carrier landing.