Single Observer Passive Localization Algorithm Based on Iterated Measurement Updating Filter
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摘要: 单站无源定位具有较强的隐蔽性, 能够避免多个观测平台之间数据的融合与同步等问题。针对单站无源定位算法性能易受测量误差一致性和初始状态误差等因素影响的问题, 文中从线性估计理论出发, 提出了一种基于迭代观测更新滤波(IMUF)的单站无源定位算法。首先, 将经典的一步离散线性估计器观测更新改写为连续时间上的逐步更新过程, 推导了连续逐步状态及其误差矩阵的演化方程, 然后进一步离散化得到迭代观测更新方程, 并采用Sigma点方法对其中的高斯矩进行近似计算, 得到了一种具有类似Kalman滤波运算形式, 适用于单站无源定位问题的迭代观测更新滤波算法。仿真试验证明, 较之传统算法, 该算法能够有效处理非一致性观测误差和大初始状态误差下的性能恶化问题, 在滤波收敛性与估计准确性方面更有优势。Abstract: Single observer passive localization has strong concealment performance, and can avoid the problem of data fusion and synchronization among multiple observing platforms. To address the performance degeneration of single observer passive localization affected by the factors such as measurement error consistency and initial state error, a single observer passive localization algorithm based on iterated measurement updating filter(IMUF) is proposed in this paper. Firstly, based on the theory of linear estimation, the classical one-step discrete linear estimator update is rewritten as the step-by-step updating process in continuous time. Secondly, the evolution equations of continuous stepwise state and its error matrix are deduced and the iterated measurement updating equation is obtained by discretization. And then, the Sigma point method are used to approximate calculate the Gaussian matrix included in updating equations, and the IMUF is obtained, which has the Kalman filter-like computation form and is suitable for single observer passive localization. Finally, compared with the classical method, the experimental results show that the IMUF algorithm can effectively deal with the performance degradation problem under non-uniform measurement error and large initial state error, with better filtering convergence and estimation accuracy.
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