卫星导航系统功率增强对区域定位服务性能的影响分析

在导航战中,卫星功率增强技术是提高战区军用接收设备抗干扰性能的重要措施。文中以walker 27/3/1星座为例,以满足战区中心4颗可见卫星的最小定位要求为目标,提出基于最优GDOP值准则和基于最少切换次数准则的两种卫星功率增强策略,从卫星功率增强区域的覆盖性、可用性以及控制的复杂性三个方面,仿真分析并比较了两种卫星功率增强策略下的定位服务性能。仿真结果表明,实施卫星功率增强在保证目标区域具备全时段服务能力的同时,还将对全球10～20%的区域形成部分时段覆盖,基于最优GDOP值准则的卫星功率增强策略和基于最少切换次数准则的卫星功率增强策略分别在GDOP值分布和控制复杂性方面具有优势,鉴于上述两种功率增强策略的特点及存在的不足,本文最后提出了一种折中考虑控制复杂度和服务性能的改进方案。

An Analysis of Effect of Enhancement on Performance of Region Positioning Service

In the navigation war,the technology of power-enhancement of satellite navigation system is one of the measures which can improve the anti-jamming capability of receivers.Taking a simulated constellation of walker 27/3/1 as an example,this paper discussed the satellite power-enhanced strategies which aim to ensure there are four visible satellites in war zone over the observation period.In this paper,the methodology and simulation process of two satellite power-enhanced strategies based on the rule of best GDOP value and based on the rule of smallest switch time were presented.Then,the performance of region positioning service under carrying out different power-enhanced strategy was analyzed and compared from several aspects such as the characteristic of coverage,usability and complexity.The results of simulation show that carrying out power-enhanced strategy would provide full-time services in target area and cause partial-time coverage in 10~20% of the global regions.The satellite power-enhanced strategies based on the rule of best GDOP value and based on the rule of smallest switch time had advantage in GDOP value and complexity respectively.Based on the characteristics and shortcomings of above two strategies,the paper concluded an improvement program which considered both the complexity of control and service performance.