The feed-forward control of utility grid voltage counteracts the influence of utility grid. The system becomes a simple passive tracking system.

电压前馈补偿可以抵消电网作用，使系统近似成为一个简单的无源跟随系统。

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According to this, this paper focuses on the study of bearings-only passive tracking system in the aspects of the target location, time alignment and nonlinear filtering algorithm.

基于这样的背景，本文从目标定位、时间配准和非线性滤波算法三个方面对多站纯方位被动跟踪系统进行了研究和算法改进。

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Constructing the system of passive multi-sensor so as to achieve the passive target detecting and tracking is significant to enhance the capability of defense system.

构建被动多传感器防御系统，实现全被动的目标探测与跟踪，对于提高防御系统的能力，具有十分重要的意义。

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