Non-rectangular array polarization monopulse radar dual-target distinguishing method

Abstract

The invention discloses a non-rectangular array polarization monopulse radar dual-target resolution method, which comprises the following steps: obtaining a plurality of pulse groups from continuous pulse signals, each pulse group having two continuous pulses; establishing a double-pulse signal model of the dual-polarization monopulse radar; establishing a single-polarization matching function model with a zero point at the actual position of the target; obtaining two groups of estimation angles of the target in the two polarization channels in each pulse group based on a single-polarization matching function; based on the single-polarization matching functions of all the pulse groups, obtaining a single-polarization mean value matching function; and respectively calculating estimation variances of all estimation angles of the two polarization channels, and establishing a fusion matching function to obtain a final estimation angle result. The method is applied to the field of radars, errors caused by a non-rectangular array are eliminated through two pulses, the position of a target is accurately estimated, the problem of angle ambiguity is solved by fusing estimation results of two polarization channels, the estimation performance is improved, and efficient, accurate and stable double-source resolution is achieved.

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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