一种基于相频函数关系的双基时差定位方法

A Double Station Time Difference Location Method Based on Function Relationship between Phase Shift and Doppler Shift

基于相、频、时三者之间的函数关系,提出了一种有助于改善现有多站时差无源定位性能的定位算法。相对于现有的平面三站时差定位方法,这种先通过频移到相差的函数变换,再利用相差和时差间的关系,将原先仅能用于机载的测距公式转化为与探测平台运动状态无关的双基时差定位方法具有更高的测量精度,避免了对高重频信号测量的定位解模糊,同时相距较远的两主基站间的时间基准可以要求不同步,这无疑有利于站址的选择。仿真结果验证了该算法的有效性。

This paper presents alocation algorithm which can help to improve existing performance of multistationtime difference location based on the function relationship among phase shift,Doppler shift and time difference. New method uses the relationship between phasedifference and time difference based on the function transforms from Dopplershift into phase shift. Finally, the ranging formula that only can apply toairborne platform can be translated into the double station time differencelocation method which is not associated with the motion state of detectionplatform. As compared to existing three stations time difference locationmethod in two-dimension plane, the double station time difference locationmethod can heighten measurement accuracy and avoid the time differenceambiguity introduced by high PRF signal. At the same time, it also has thecharacteristics that the time reference between two major base stations can be deranged,and that looking for the building position of base station is more convenient.Simulation result proves the availability of the algorithm.