Moving-target adaptive direction-finding, positioning and tracking method based on multi-star collaboration

Abstract

The invention provides a moving-target adaptive direction-finding, positioning and tracking method based on multi-star collaboration. The method comprises following steps: multiple satellites in orbitsynchronously or asynchronously acquire time-varying sight line vector information of a moving target, one satellite is selected as a primary satellite, and the other satellites are used as auxiliarysatellites; the auxiliary satellites send sight line measurement data and positioning assisted data to the primary satellite through inter-satellite links; least square estimation of an initial stateis performed by a constant-velocity motion model, and an initial covariance matrix is set according to measurement noise of a target azimuth; a motion state and a covariance matrix of the target at the current observation moment are predicted by adopting a 12-state linear motion model; a Jacobian matrix of azimuth measurement values is calculated through combination of the positioning assisted data and the predicted motion state at the current moment, filter gain is calculated according to the measurement noise covariance matrix, and finally, the motion state of the target at the current moment is estimated according to real measurement.

Description

Technical field [0001] The invention relates to a space-based space moving target tracking method, and more specifically, to a space moving target positioning and tracking method based on pure azimuth measurement using a multi-satellite coordination method. Background technique [0002] The monitoring of space non-cooperative targets such as space debris has received increasing attention from all countries. With the improvement of the requirements for measurement accuracy, observation field, anti-interference, etc., the development of space-based passive positioning technology based on photoelectric sensor pure azimuth measurement (direction finding positioning) is a general trend. Due to the lack of ranging information under the direction finding system, multi-satellite collaborative observation can achieve the target's three-dimensional space positioning. Considering that it is difficult to keep the same observation start time and observation frequency under multi-satellite co...

AI Technical Summary

Problems solved by technology

[0003] At present, there are few introductions on the multi-satellite cooperative moving target direction finding positioning and tracking method. After literature search, the Chinese invention patent application number 201610172124.7, the patent name is "Multi-sensor passive direction finding and positioning method", the estimation method is first through a The first-order prediction transfer matrix extrapolates all the observation data of multiple sensors to the positioning time, and the non-real-time measurement is efficient to estimate, which reduces the calculation efficiency while losing the positioning accuracy.

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