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无源被动定位技术中一个重要问题，是如何使定位的约束条件尽可能地少，即尽可能地提高方法的可操作性。只利用测角信息（ＤＯＡ）的定位方法，由于可观测性的要求，在单观测平台对运动目标定位时，常常需要观测平台作特殊的机动运动，这种约束给实际操作带来很大不便。本文提出了一种引入测频信息对运动目标进行定位的定位方法，并给出了可观测性分析。运用该定位法定位，观测平台的运动形式可以任意，特别有意义的是，在满足某些条件情况下观测平台还可以完全静止不动。
An important issue in passive passive location technology is how to make positioning constraints as small as possible, that is, to improve the operability of the method as much as possible. Due to the requirement of observability, only the angular position information (DOA) is used to locate the moving target when the single observing platform locates, and often the observing platform is required to make special maneuvering motion. This constraint brings great inconvenience to the practical operation . This paper presents a method of locating the moving target by introducing frequency measurement information, and gives the observability analysis. Using this positioning method, the observational platform can take any form of motion. It is particularly significant that the observing platform can still be completely stationary under certain conditions.