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中文摘要：
提出了一种基于局部地球重力场模型的水下被动定位新模式。这种方法无需使用常用的匹配算法，因而也就摆脱了匹配算法的诸多限制。以分辨率为2’×2’的某区域重力异常数据为背景场进行仿真，仿真结果表明，局部重力场模型的平均误差小于0．1331mGal，潜器的平均经纬方向定位误差分别小于0．7770nmile和1．2444nmile。
英文摘要：
A new pattern for passive location which based on local gravity field model is presented. A fast Fourier series based local gravity field model is firstly introduced; then by which the measured gravity is expressed as continual analytical equation. Finally the classical extended Kalman filter is introduced to estimate the target position with measured gravity as measurement containing the information of target positon. Simulation is done on 0.2＇×0. 2＇ gravity anoma gravity anoma y database; the result shows that the mean error of analytic equation of local ies is less than 0. 133 1 mGal; and the mean location errors in longitude and latitude are less than 0. 777 0 nmile and 1. 244 4 nmile respectively.
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