A method and system for measuring target rcs based on wideband radar looking down
A wideband radar and target technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of large measurement errors of the calibration body, inability to achieve accurate measurement of the calibration body, and large gaps in field strength distribution, and achieve accurate results. The effect of measurement
Active Publication Date: 2021-04-30
BEIJING INST OF ENVIRONMENTAL FEATURES
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However, for the test at a large depression angle, the inherent high-intensity background clutter on the ground can easily cover the echo signal of the calibration body with low scattering intensity, and even laying absorbing materials on the ground cannot achieve accurate measurement of the calibration body Accurate Calibration of Targets
[0003] In addition, when the broadband radar is calibrated on the ground, the main beam of the radar receiving antenna will receive the direct wave signal and the reflected wave signal from the ground, which leads to a large measurement error of the calibration body
At the same time, due to the influence of ground reflection waves, the field strength distribution of different frequency points within the broadband measurement radar bandwidth varies greatly
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[0025] In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0026] figure 1 is the schematic diagram of radar imaging obtained in the existing top-down measurement calibration, such as figure 1 As shown, in the existing overhead measurement and calibration technology, the radar set in the air is used to detect the calibration object on the ground with an attitude of looking down. Due to the influence...
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The present invention relates to a method and system for measuring RCS of a target based on wideband radar looking down. An embodiment of the method includes: using a wideband radar set in the air to transmit a measurement signal to the target in a looking down attitude, and receiving target echo signals; The wideband radar is set on the ground, and the wideband radar set on the ground is used to transmit a calibration signal to the calibration body on the ground, and receive the echo signal of the calibration body; according to the radar equation, the received calibration body The echo signal is converted into calibration volume echo data corresponding to the distance between the broadband radar set in the air and the target; and the target RCS is determined according to the target echo signal and the calibration volume echo data. This embodiment can realize the test of the calibration body in the free space and the precise calibration of the broadband radar top-down measurement, which is helpful for the precise measurement of the target RCS.
Description
technical field [0001] The invention relates to the technical field of electromagnetic scattering, in particular to a system for measuring target RCS based on broadband radar. Background technique [0002] In the process of wideband radar looking down to measure the RCS (Radar Cross Section) of the target, generally speaking, the RCS of the target is larger than the surrounding clutter on the ground, and it is easy for the measuring radar to obtain its echo information, but to obtain the RCS of the target, it is necessary Accurate calibration of the target echo. In order to ensure the measurement accuracy of the target RCS, the uncertainty of the calibration body should be less than 1dB, so the signal-to-noise ratio of the calibration test should be greater than 20dB. However, for the test at a large depression angle, the inherent high-intensity background clutter on the ground can easily cover the echo signal of the calibration body with low scattering intensity, and even ...
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IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 刘飞亮高超白杨侯浩浩王铁兴
Owner BEIJING INST OF ENVIRONMENTAL FEATURES