A Distributed Space Target Tracking Algorithm Based on Asynchronous Multi-sensor Networks
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摘要:
为解决传感器网络在空间目标分布式跟踪过程中的异步采样及通信延迟问题，该文提出一种异步分布式信息滤波算法(ADIF)。首先，局部传感器与相邻节点之间以一定的拓扑结构传递带采样时标的局部状态信息和量测信息，然后将收到的异步信息按时间排序，使用ADIF算法进行计算，分别对目标状态进行估计。该方法实现简单，传感器间通信的次数少，支持网络拓扑的实时变化，适用于空间目标监测中的多目标跟踪问题。该文分别对空间单目标、多目标跟踪进行了仿真，结果表明算法可以有效解决异步传感器滤波问题，分布式滤波精度一致逼近于集中式结果。
Abstract:To solve the problem of asynchronous sampling and communication delay of sensor network in space target tracking, an Asynchronous Distributed algorithm based on Information Filtering (ADIF) is proposed. First, local state information and measurement information with sampling time is transmitted between local sensor and adjacent nodes in a certain topology structure. Then, the local sensor sorts the received asynchronous information by time, and ADIF algorithm is used to calculate the target state respectively. This method is simple to implement, the frequency of communication between sensors is small, and it supports the real-time change of network topology, which is suitable for multi-target tracking. In this paper, single target and multi-target tracking are simulated respectively. The results show that the algorithm can effectively solve the problem of asynchronous sensor filtering, and the distributed filtering accuracy converges to the centralized result.
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表 1 目标初始轨道
历元 X(m) Y(m) Z(m) Vx(m·s–1) Vy(m·s–1) Vz(m·s–1) 2019-04-25 04:11:56 980093.466 1709342.512 6698030.714 6293.741438 3734.785328 –1863.584480 
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表 2 天基光学相机轨道根数
天基相机 历元 a(km) e i(°) Ω(°) ω(°) M(°) P1 2019-4-25 04:00:00 6878.137 0.000011 45.0 359.8 0.0 339.8 P2 2019-4-25 04:00:00 6778.137 0.000010 63.4 250.1 10.2 35.0
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表 3 各测站集中式与分布式滤波位置平均RMSE
滤波类型 P1 P2 S1 S2 S3 位置 ADIF(m) 11.4389 10.7740 11.6683 11.3893 10.9962 EIF(m) 9.6533 速度 ADIF(m/s) 0.4550 0.4563 0.4575 0.4564 0.4564 EIF(m/s) 0.3973
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表 4 目标2初始轨道
历元 X(m) Y(m) Z(m) Vx(m·s–1) Vy(m·s–1) Vz(m·s–1) 2019-04-25 04:00:55 6985582.028 542743.450 1003434.795 –966.305250 –1160.131728 –7350.707562
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