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A method for correcting inertial group error

An error correction and inertial group technology, which is applied in the field of synthetic aperture radar, can solve the problems of increasing sources of inertial group errors and no correction of inertial group errors.

Active Publication Date: 2021-05-04
THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the bistatic SAR system, due to the separation of the transmitting and receiving platforms, the sources of inertial group errors increase. At present, there is no complete analysis method or system to correct the inertial group errors.

Method used

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  • A method for correcting inertial group error
  • A method for correcting inertial group error
  • A method for correcting inertial group error

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Embodiment Construction

[0045] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0046] see figure 1 and figure 2 As shown, the embodiment of the present invention provides an inertial error correction method for error correction of the navigation parameters of the bistatic SAR, the transmitter inertial set, and the receiver inertial set, including the following steps:

[0047] The ranging error model of bistatic SAR is established by taking the clock error of the receiver and the transmitter to be equivalent to the error in the distance;

[0048] Based on the ranging error model of bistatic SAR, the state equation of bistatic SAR ranging is established;

[0049] Establish the state equations of the receiver inertial group and the transmitter inertial group;

[0050] Establish the state equation of the cooperative navigation system based on bistatic SAR and detection target distance constraints;

[0051]Establish the ...

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Abstract

The invention discloses an inertial group error correction method, which relates to the technical field of synthetic aperture radar. The method includes establishing a ranging error model of bistatic SAR; establishing a state equation of bistatic SAR ranging; establishing a receiver inertial group and a transmitter The state equation of the inertial group; the establishment of the state equation of the cooperative navigation system based on the bistatic SAR and the detection target distance constraint; the establishment of the observation equation of the cooperative navigation system based on the bistatic SAR and the detection target distance constraint; the establishment of the discrete Kalman filter The recursive equation is used to solve the Kalman filter; the bistatic SAR ranging error correction information, the receiver inertial group and the transmitter inertial group navigation parameter correction information are fed back to the navigation solution to correct the navigation parameters. The method is a cooperative navigation system constructed by the bistatic SAR, the receiver inertial group and the transmitter inertial group, which can improve the error estimation accuracy of the receiver inertial group and the transmitter inertial group.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar, in particular to an inertial set error correction method. Background technique [0002] The bistatic SAR system refers to the synthetic aperture radar system in which the receiver and the transmitter are installed on different platforms, and the receiver and the transmitter can have different spatial positions and movement speeds. The transmitter transmits the chirp signal to the observation area, and the receiver receives the ground echo signal and performs imaging processing. Bistatic SAR has many outstanding advantages due to the separation of transceivers. It can obtain the non-backscatter information of the target, and has the characteristics of long range, concealment and strong anti-interference. Bistatic SAR can provide high-resolution images of the observation area all day and all day long. Therefore, bistatic SAR, as a new means of space-to-earth observation, is widely...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
Inventor 杨凯新王春联吴丰阳胡奇罗雪平沈志陈术涛闫士杰蔡昔
Owner THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD
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