基于二次相位差的空对地单站无源定位方法

Air-to-ground Single Station Passive Location Method Based on The Secondary Phase Difference

长基线干涉仪具有相位差测量精确的优点,但是单个长基线干涉仪测量相位差存在2π模糊的问题,可以采取再增加一定数量干涉仪的方法来消除2π模糊的影响,但这同时也增加工程实现的复杂性。在单个长基线干涉仪的基础上,采用二次相位差的方法可以绕开2π模糊的问题,实现空对地的快速单站无源定位。对该方法进行仿真分析,验证了该方法的定位效果。

The interferometer with long baseline has the advantage of accurately measuring the phase difference,but the phase difference measured by the interferometer with single long baseline has the problem of 2π ambiguity, which can be solved by adding a number of interferometers, which meantime makes it complex to be realized out in engineering. Based on single long baseline interferometer,this paper adopts the method of the secondary phase difference to steer clear of the 2π ambiguity in order to realize the fast air-to-ground passive location for single observer. The method has been simulated and analyzed and the location effect has been proved.