卫星干扰源精确定位的位置校正算法

Algorithm of position calibrator for satellite interference location

卫星干扰源定位系统可以通过测量两颗卫星对干扰源形成的时差(DTO)和频差(DFO)来完成对未知干扰源的定位,但卫星的星历难以准确测定,其微小变化将引起定位结果的较大误差。针对这一问题,提出利用多个位置校正站来修正卫星星历以消除其对定位结果影响的算法,并通过理论推导证明了有四个或四个以上的位置校正站时,该算法可以消除卫星星历不准确对定位结果的影响。仿真结果表明,与未采用位置校正站的定位结果相比,该算法能获得优于一个数量级以上的定位精度改善。

With differential time offset (DTO) and differential frequency offset (DFO), the position of the satellite interference can be located by using two-satellite. However, it's very difficult to obtain accurate satellite ephemeris, which limits the accuracy of locating the satellite interference. In this paper, a novel algorithm is developed to eliminate the effects of the uncorrected ephemeris by using position calibrators. Theoretical derivation is given in detail and it's proved that the errors introduced by uncorrected ephemeris can be completely removed through the use of four or more position calibrators. Compared with existing alternatives without position calibrators, simulation results confirm that the proposed algorithm can reduce the position error by an order of magnitude or more.