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Active and passive fusion calibration method and device

A calibration and target technology, applied in the field of target detection, can solve the problems of large polarization calibration error, poor calibration accuracy, single calibration method, etc.

Pending Publication Date: 2020-11-24
BEIJING INST OF ENVIRONMENTAL FEATURES
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Problems solved by technology

[0003] In the traditional polarization calibration, the calibration method given is relatively simple. For the research of radar moving targets, there are often problems of large polarization calibration errors and poor calibration accuracy.

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  • Active and passive fusion calibration method and device
  • Active and passive fusion calibration method and device
  • Active and passive fusion calibration method and device

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Embodiment Construction

[0087] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0088] like figure 1 As shown, an active and passive fusion calibration method provided by an embodiment of the present invention includes the following steps:

[0089] S1. Under the condition that the internal calibration of the radar is completed, set the parameters and set the transmit signal. The transmit signal is generated by the sign...

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Abstract

The invention relates to an active and passive fusion calibration method and device, and the method comprises the steps: carrying out the parameter setting under the condition that a radar completes the internal calibration, and setting a transmitting signal; adding a multiplicative error of a transmitting channel and time delay caused by forward propagation to the transmitting signal to obtain afully polarized signal transmitted by an antenna; simulating a theoretical polarization scattering matrix by utilizing a digital active calibrator according to the complete polarization signal to obtain a backward scattering signal of the moving target; adding a multiplicative error of a receiving channel to the received back scattering signal, performing down-conversion to zero frequency, and completing sampling storage to obtain a polarization scattering matrix; performing motion compensation and time delay compensation according to the obtained polarization scattering matrix; and performingpassive polarization calibration on the compensated polarization scattering matrix, correcting residual errors, obtaining a calibrated target polarization scattering matrix and completing calibration. The active and passive polarization calibration advantages are combined, and the polarization calibration precision of the moving target can be improved.

Description

technical field [0001] The invention relates to the technical field of target detection, in particular to an active and passive fusion calibration method and device. Background technique [0002] After the radar works normally for a period of time, some parameters may change. Generally, only through calibration processing can it be ensured that accurate target information can be extracted from the radar image. For the detection and identification requirements of air / space targets, it is very necessary to carry out research on the full polarization measurement error calibration of moving targets. Before actual use, it is usually necessary to analyze the influence of non-system factors and system non-ideal factors on the polarization measurement accuracy of full-polarization radar, and to improve the measurement accuracy of moving targets through calibration. [0003] In the traditional polarization calibration, the given calibration method is relatively simple. For the resea...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40G01S7/02
CPCG01S7/4052G01S7/024G01S7/4069
Inventor 刘芳白杨
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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