Background extraction and offset processing method for RCS (Radar Cross Section) measurement of low detectable target

A technology of background extraction and processing method, which is applied in the field of background extraction and cancellation processing in radar cross section measurement, and can solve the problems of non-polarized scattering matrix measurement application, difficult to guarantee extraction accuracy, and high RCS level

Active Publication Date: 2015-05-20
BEIHANG UNIV
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  • Abstract
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Problems solved by technology

[0038] Disadvantages of prior art 1: The main disadvantage of using this auxiliary device is that it is necessary to design a special mechanism to drive the auxiliary measurement carrier to translate back and forth
[0041] Disadvantages of prior art 2: the technology of using eccentric cylinders for auxiliary measurement and background extraction avoids the requirement of translation of the carrier, but this technology also has the following obvious disadvantages:
Obviously, its extraction accuracy is difficult to guarantee
[0046] (2) Since the cross-polarization scattering component of the metal cylinder is zero, this device cannot be used for background auxiliary measurement and extraction under cross-polarization, so it cannot be used for polarization scattering matrix measurement applications
[0079] The main disadvantages of t

Method used

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  • Background extraction and offset processing method for RCS (Radar Cross Section) measurement of low detectable target
  • Background extraction and offset processing method for RCS (Radar Cross Section) measurement of low detectable target
  • Background extraction and offset processing method for RCS (Radar Cross Section) measurement of low detectable target

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Embodiment Construction

[0143] The general process and steps of background auxiliary measurement and extraction processing are as follows:

[0144] (1) Design and process a background auxiliary measuring body according to the RCS test field support and other conditions;

[0145] (2) Install the auxiliary measuring body on the target bracket, and move relative to the measuring radar in a certain way, measure and obtain the I and Q channel signals S of the scattered echoes of the auxiliary measuring body I (f,t),S Q (f,t). Assume that a total of N discrete echo signal samples are obtained for a given frequency f, denoted as S I (f,t i ),S Q (f,t i ), i=1,2,...,N;

[0146] (3) Process according to the signal processing scheme discussed above to obtain the scattered echo phase φ of the auxiliary measuring body T (f,t) and amplitude A T Estimated value of (f), where the estimated value of phase is:

[0147] φ T ( f , ...

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Abstract

The invention discloses a background extraction and offset processing method for RCS (Radar Cross Section) measurement of a low detectable target. The method can cover, but is not limited to, the existing operation including rectilinear translation of an auxiliary measurement carrier, azimuth rotation of an eccentric cylinder or rotation measurement of a dihedral angle reflector around a radar sight line. According to the method, a fixed background can be extracted by utilizing measurement data of various different auxiliary measurement bodies, thereby greatly expanding the application range of auxiliary background measurement, background extraction and offset technologies in the RCS measurement of the low detectable target. Particularly, when double-calibration bodies serve as the auxiliary measurement bodies, calibration measurement and auxiliary background extraction measurement can be simultaneously completed at a time; when targets self serve as the auxiliary measurement bodies, target measurement and auxiliary background extraction measurement are simultaneously completed at a time. According to the method, the measurement process and the workload are greatly simplified, and the problem of non-ideal background offset processing effect caused by the factors such as shifting of a measurement system is further solved.

Description

technical field [0001] The invention relates to the technical fields of communication and radar, in particular to a background extraction and offset processing method in radar cross section (RCS) measurement of low detectable targets. Background technique [0002] In order to discuss the measurement and calibration of the target wideband radar cross section (RCS) amplitude and phase, the target wideband complex scattering function is defined for: [0003] σ ( f ) = lim R → ∞ 4 π R · E s ( f ) E i ( f ) ...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S7/292G01S7/35
CPCG01S7/292G01S7/35G01S7/41
Inventor 许小剑
Owner BEIHANG UNIV
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