Weak target double-channel monopulse angle measurement method based on reference signal

Abstract

The invention provides a weak target double-channel monopulse angle measurement method based on a reference signal. Compared with a traditional three-channel monopulse angle measurement algorithm, anazimuth difference channel and a pitch difference channel are combined into a path difference channel, and the path difference channel and a sum channel form double channels for signal processing to obtain measurement values of a pitch angle and an azimuth angle, that is to say, the method is a dual-channel monopulse angle measurement method based on channel combination, the number of channels ofa receiver is reduced, hardware resources such as the size, the mass and the power consumption are reduced, and the method is more suitable for a small integrated platform, moreover, reference signalsare introduced, and are adopted to carry out matched filtering with sum and difference channel signals, so a problem of angle measurement caused by random phase and non-coherent frequency differenceexisting between pulses in received signals under a non-coherent working system of a transceiving split small integrated platform is solved, phase-locked accumulation can be carried out between different pulses, and the angle measurement performance of a weak target is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of radar measurement, in particular to a method for measuring the angle of a weak target with two channels and single pulses based on a reference signal. Background technique [0002] For the angle measurement of weak targets, the traditional single-pulse angle measurement technology can achieve the purpose of improving the angle measurement accuracy by adding auxiliary channels and coherent accumulation. [0003] In the article "Radar Measurement Extraction in the Presence of Sea-Surface Multipath" published by A. Sinha et al. in IEEE Transactions on Aerospace and Electronic Systems, Vol. 39, No. 2, pp. 550-567, a multipath The angle measurement error caused by specular reflection and diffuse reflection in the effect, thereby improving the algorithm of angle measurement accuracy. In the article "Amplitude Angle MonopulseEstimation for the Four-channel Hybrid Polarimetric Radar System" published by Yi Zhang...

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Problems solved by technology

[0005] However, for a small integrated platform with a shared transmitter source, a non-coherent working system with separate transceivers is adopted, and there are non-coherent frequency differences and random initial phases between received echo pulses. The problem of low angular accuracy and the inability to achieve coherent accumulation

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