Self-adapting space interference suppression method of one-dimensional phase scanning three-coordinate radar

Abstract

The invention discloses a self-adapting space interference suppression method of a one-dimensional phase scanning three-coordinate radar, which comprises the steps that a radar system distributes detection pulse resources, a signal processing subsystem detects and receives echoes of antenna of all rows, azimuth angles and pitching angles, carries out digital down conversion processing, weights wave beams at equal intervals in directions of the pitching angles to obtain space-distance domain data, then carries out one-dimensional fourier transformation, extracts interference feature information in a frequency domain for interference judgment, and records the azimuth angle and the pitching angle of interference when judging the interference; and at the same time, the signal processing system carries out wave beam weight water-flowing solving for multi-beam weighting to form multiple received wave beams reset in an interference direction by a phase-only method according to an interference angle recorded in the last scanning period and an expected direction of the current target. The method applies self-adapting space interference suppression to a pulse doppler radar according to characteristics of the one-dimensional phase scanning three-coordinate radar, and survivability and target detection capability of the radar in an interference environment are effectively improved.

Description

technical field [0001] The invention relates to a method for airspace self-adaptive interference suppression of a vehicle-mounted one-dimensional phase-scanned three-coordinate radar. Background technique [0002] In the prior art, phased array radars can be roughly divided into two categories, namely full electronically scanned phased array and limited electronically scanned phased array. The full electronically scanned phased array can also be called the fixed phased array, that is, the electronically scanned array is used in both azimuth and elevation, and the antenna array is fixed. The finite electronically scanned phased array is a hybrid antenna design, which combines two or more antenna technologies to obtain the desired effect. At first, the phase-scanning technology is combined with the reflector antenna technology, and its electric scanning angle is small. Only a small number of radiation elements are needed, so the cost and complexity of the equipment can be gre...

AI Technical Summary

Problems solved by technology

Sidelobe blanking adopts the method of directly blocking the signal. When the interference signal is a pulse signal or noise interference with a high duty cycle, the target signal is turned off most of the time, resulting in radar failure

The sidelobe cancellation technology mainly relies on auxiliary antennas to suppress interference. Due to the limited number of auxiliary antennas, the angle resolution of interference is low and the number of interference suppression is small.

[0004] With the development of array antennas and array signal processing, adaptively adjusting weights according to changes in the interference environment to offset interference and enhance target signals in the desired direction has become a hot issue in modern radar airspace interference suppression research. In recent years, airspace autonomous Adaptive interference suppression weight calculation algorithms have become increasingly mature, such as the minimum variance undistorted response algorithm, sampling matrix inversion algorithm (SMI), least mean square (LMS) algorithm, recursive least squares (RLS) algorithm, etc. For vehicle-mounted one-dimensional phase-scanning three-coordinate radar, due to the high radar data rate, the radar dwell time in each azimuth beam is limited, it is difficult to ensure real-time calculation of weights, which restricts engineering applications

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