Five-dimensional dynamic stereoscopic clutter map implementation method based on DDR3-SDRAM

Abstract

The invention relates to a five-dimensional dynamic stereoscopic clutter map implementation method based on a DDR3-SDRAM. According to the five-dimensional dynamic stereoscopic clutter map implementation method, reading and writing control over the DDR3-SDRAM is achieved through an FPGA, and then a five-dimensional dynamic stereoscopic clutter map is established. The method comprises the following steps that (a) reading operation is conducted on the DDR3-SDRAM, and clutter data are read out; (b) a clutter map is updated through a recursive filter, and data conversion is conducted; (c) the updated cluster data are rewritten to the corresponding position of the DDR3-SDRAM, updating of the cluster map is completed, and a clutter map is established. Compared with a traditional cluster map implementation method, the five-dimensional dynamic stereoscopic clutter map implementation method based on the DDR3-SDRAM is characterized in that a clutter area is finely divided, and besides traditional distance division, direction division and pitching division, a PRF mode and clutters of a full-Doppler channel are also divided. Clutter data are specially processed, the storage capacity of the clutter map is doubled.

Description

technical field [0001] The invention belongs to the field of digital signal processing in array radar signal processing, and relates to target detection of clutter images. It specifically relates to a DDR3-SDRAM-based five-dimensional dynamic clutter map implementation method, using DDR3-SDRAM to establish a five-dimensional three-dimensional dynamic clutter map, five-dimensional for azimuth, pitch, distance, Doppler channel and PRF mode. Background technique [0002] The clutter map is a clutter intensity distribution map stored in the memory within the range of radar power. It is a technology for detecting moving targets with extremely low Doppler frequencies or suppressing clutter. With the development of large-scale integrated circuits and modern radar With the development of radar, the research of clutter diagram has been paid more and more attention by radar design workers. [0003] The modern radar signal processing system largely works on the clutter. It records the...

AI Technical Summary

Problems solved by technology

The 3D clutter map divides the detection range of the radar into several distance / azimuth / elevation area units. Compared with the traditional clutter map, the 3D clutter map can distinguish between high and low altitude areas. The establishment of a full-frequency channel clutter map cannot effectively suppress ground clutter and meteorological clutter; on the other hand, the three-dimensional clutter map is not fine enough to divide the clutter areas within the radar detection range, and the clutter power estimation The method adopts the method of intra-pulse distance unit averaging and inter-pulse correlation accumulation, so the resolution of the clutter map is not high, which leads to insufficient suppression of ground clutter and meteorological clutter by some multi-beam radars and three-coordinate radars Sufficient, thereby reducing the detection performance of the radar and the adaptability to the clutter environment

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