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Background signal extraction method in radar scattering cross section measurement

A radar cross section and background signal technology, applied in the field of radar signal processing, can solve problems such as poor robustness

Active Publication Date: 2013-04-24
BEIHANG UNIV
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Problems solved by technology

[0014] The invention provides a background signal extraction method in radar scattering cross-section measurement, which is used to extract a higher-precision background signal, and solves the problem of poor robustness in practical engineering applications

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  • Background signal extraction method in radar scattering cross section measurement

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Embodiment Construction

[0062] figure 1 It is a flow chart of Embodiment 1 of the background signal extraction method in radar cross-section measurement of the present invention, as figure 1 As shown, the method includes:

[0063] Step 101: Measure and acquire the echo signal of the radar transmission signal reflected by the dihedral corner reflector.

[0064] In the case of a single station, the radar transmitting and receiving antennas are at the same position, and the echo signal received by the receiving antenna can be expressed as formula (15):

[0065] M=R(S+B+N)T=RST+RBT+RNT (15)

[0066] Among them, M, R, S, B, N, and T are the echo signal received by the receiving antenna, the receiving matrix of the radar system, the target polarization matrix, the background matrix, the noise matrix and the system emission matrix.

[0067] The receiving matrix R can be written as formula (16)

[0068] R = R ...

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Abstract

The invention provides a background signal extraction method in radar scattering cross section measurement. The method includes measuring echo signals used for obtaining radar transmission signals reflected by a dihedral angle reflector, isolating the echo signals into in-phase channel signals and orthogonal channel signals, obtaining first complex signals through reconstruction of the in-phase channel signals, obtaining second complex signals through the orthogonal channel signals, respectively obtaining real part signals and imaginary part signals of the first complex signals and the second complex signals by means of a curve fitting algorithm, obtaining the real part signals of background signals according to the real part signals and the imaginary part signals of the first complex signals, and obtaining the imaginary part signals of background signals according to the real part signals and the imaginary part signals of the second complex signals. Due to the fact that the background signals are extracted through the curve fitting algorithm in high precision, the background signal extraction method in the radar scattering cross section measurement solves the problem that robustness is poor in practical engineering application.

Description

technical field [0001] The present invention relates to radar signal processing technology, in particular to a background signal extraction method in radar cross section (Radar CrossSection, RCS for short) measurement. Background technique [0002] The extraction of background signals and the cancellation of background signals are important links in radar cross section (Radar Cross Section, RCS) measurement. Among them, the accuracy of background signal extraction directly affects the effect of background signal cancellation, so the accuracy of background signal extraction is particularly important. [0003] The prior art proposes a method for extracting the polarized background signal by rotating the dihedral reflector, which expresses the polarized signal as: [0004] m pq (θ)=c pq cos2θ+s pq sin2θ+B i +N i (11) [0005] Among them, M is the echo signal of the radar transmission signal reflected by the dihedral reflector obtained by measurement, p and q refer to...

Claims

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Application Information

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IPC IPC(8): G01S7/41
Inventor 孙双锁许小剑李亦同
Owner BEIHANG UNIV
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