A multi-satellite coordinated moving target adaptive direction finding positioning and tracking method

Abstract

The present invention provides a multi-satellite cooperative moving target adaptive direction finding positioning and tracking method, which includes the following steps: multiple satellites in orbit synchronously or asynchronously acquire the line-of-sight vector information of the moving target changing with time, and select one of the satellites as the main satellite , other satellites act as auxiliary satellites; the auxiliary satellites send line-of-sight measurement data and positioning assistance data to the main satellite through the inter-satellite link; use the constant speed motion model to perform the least squares estimation of the initial state, and set the initial covariance matrix according to the target azimuth measurement noise ;Adopt the 12-state linear motion model to predict the motion state and covariance matrix of the target at the current observation moment; combine the positioning auxiliary data and the predicted motion state at the current moment to calculate the Jacobian matrix of the azimuth measurement value, and calculate it according to the measurement noise covariance matrix Filter gain, and finally estimate the motion state of the target at the current moment according to the real measurement.

Description

technical field [0001] The invention relates to a space-based space moving target tracking method, more specifically, relates to a space moving target positioning and tracking method based on pure azimuth measurement using multi-satellite coordination. Background technique [0002] The monitoring of space non-cooperative targets such as space debris has attracted more and more attention from all countries. With the improvement of the requirements for measurement accuracy, observation field of view, and anti-interference, it is the general trend to develop space-based passive positioning technology based on pure azimuth measurement (direction-finding positioning) of photoelectric sensors. Due to the lack of ranging information in the direction-finding system, multi-satellite coordinated observation can realize the three-dimensional space positioning of the target. Considering that the observation start time and observation frequency are difficult to keep consistent under mul...

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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