Background signal extraction method in radar scattering cross section measurement

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...

Images