Azimuth synthetic aperture radar system based on rotatable antennas

Abstract

The invention relates to an azimuth synthetic aperture radar system based on rotatable antennas. The azimuth synthetic aperture radar system comprises a uniform circular array composed of antennas, an antenna supporting rotary disc, a collector ring, a motor and a radar radio frequency receiving channel. The antennas are uniformly arranged on the antenna supporting rotary disc, the motor controls the antenna supporting rotary disc to rotate, a signal received by the antennas is transmitted to the radar radio frequency receiving channel through the collector ring, and the circular array is equalized into single whip antennas which are located at the circle center and have a plurality of directional responses through the signal interference processing technology. Meanwhile, azimuth scanning of a directional diagram is achieved through mechanical rotation of the single whip antennas, the rank of a flow pattern matrix of the antenna array is improved, an independent observation vector of the antennas is increased, and the same effect of azimuth aperture synchronization is achieved. The small electric circular array is adopted in the system, the occupied area oft the antenna array is reduced, all-dimensional unambiguous azimuth angle information can be provided, radar detection of the frequency bands suck as HF / VHF / UHF is achieved, and the detection performance of the system can be equivalent to a traditional ground-wave radar with an array occupying tens and hundreds of meters.

Description

technical field [0001] The invention relates to an azimuth synthetic aperture radar system based on a rotating antenna, which belongs to the field of radar technology, in particular to radar systems in HF / VHF / UHF and other frequency bands. Background technique [0002] In order to obtain sufficient azimuth resolution and directional gain for high-frequency over-the-horizon radar, the short-band radar antenna array is often hundreds of meters or even thousands of meters, which directly affects the scale, cost and installation cost of the equipment, and cannot meet the national alignment and low-cost requirements. The growing need for beyond-horizon detection. Scholars and engineers from various countries have done a lot of work on the miniaturization of ground wave radar antennas. Although the small antenna array has the advantages of low cost, portability and flexibility, it has shortcomings in the accuracy of the inversion results. In addition, the design of antenna param...

AI Technical Summary

Problems solved by technology

At the same time, due to the low azimuth resolution of small arrays, the limited transmission power of civil ground wave radars, and various noises and interferences (including interference from ocean echoes), the detection probability and false alarm of targets, especially small targets and maneuvering targets There are a series of problems that need to be overcome in terms of rate, positioning and tracking accuracy.

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