A non-rectangular array polarimetric monopulse radar dual target discrimination method

Abstract

The invention discloses a non-rectangular array polarization monopulse radar dual target discrimination method, comprising: obtaining several pulse groups from continuous pulse signals, and the pulse group has two continuous pulses; Pulse signal model; establish a single-polarization matching function model with a zero point at the actual position of the target; based on the single-polarization matching function, two sets of estimated angles of the target in the two polarization channels in each pulse group are obtained; The matching function is transformed to obtain a single-polarization mean matching function; the estimated variances of all estimated angles of the two polarization channels are calculated separately, and a fusion matching function is established to obtain the final estimated angle result. The invention is applied to the field of radar, eliminates the error caused by the non-rectangular array through two pulses, accurately estimates the position of the target, solves the problem of angle ambiguity by fusing the estimation results of the two polarization channels, improves the estimation performance, and realizes high-efficiency, Accurate and stable dual source resolution.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a dual target discrimination method of a non-rectangular array polarized monopulse radar. Background technique [0002] Monopulse is a mainstream technology, which is widely used in target tracking and precision guidance. The essential requirement of monopulse radar is to estimate the target angle accurately. However, a classic problem in monopulse processing is the presence of two unresolved targets in the main beam. In 1982, Nickel proposed a traditional monopulse radar based on summation, azimuth difference and elevation difference channels to estimate the target parameter fitting model of two closely spaced targets, which requires multiple pulses to obtain the optimal solution. Based on the statistical distribution of the complex single pulse ratio, at the same time in 2020 Dong proposed the method of moments to estimate the angles of two Rayleigh targets. The method is enha...

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Problems solved by technology

[0004] However, when the monopulse radar is configured with a non-rectangular array, such as a circular array, an elliptical array, or a diamond array, the dual-target resolution algorithm of FCMR will produce serious estimation errors due to the distortion of the antenna pattern

For this problem, although there is a solution in the subarray-based four-channel monopulse approach, it sacrifices the target echo power for elements outside the inscribed rectangle of the initial non-rectangular array, only for each element There is a digital array system channel that receives the

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