基于北斗信号辐射源的无源雷达定位技术

Positioning of passive radar based on Beidou external illuminator

外辐射源无源跟踪对提高区域防御系统的生存能力和反击能力具有重要的军事意义和实用价值。近年来,基于星载辐射源的无源雷达探测系统受到广泛关注。在选取北斗卫星信号为研究对象的基础上,首先从模糊函数和雷达探测距离方面重点分析了北斗信号作为无源雷达辐射源的实用性。然后研究了一种基于时差测量的多发单收型无源雷达定位系统,并给出了解算目标位置的总体最小二乘算法。最后对该系统下的定位算法和定位精度进行分析,仿真结果表明在相同条件下,总体最小二乘算法能减小近50%的定位误差,且误差波动范围明显减小。

Passive tracking has great military and practical value in improving the viability and retaliatory capability of the regional defense system.In recent years,the passive radar detecting system based on satellite borne transmitters has attracted a wide spread attention.In this paper,by taking Beidou signal as research object,the practicality of the Beidou signal as an external illuminator of the passive radar was discussed in the respects of ambiguity function and detection range.Then a Tn-R location model based on time difference of arrival（TDOA） was proposed and the location algorithm of the total least squares（TLS） was derived.At last,the positioning accuracy of this model was analyzed.The simulation results show that,under the same conditions,the total least squares algorithm can reduce nearly 50% of the positioning error,and error ranges are significantly reduced.