A five-dimensional dynamic stereo clutter map realization 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 clutter map target detection. Specifically, it relates to a method for implementing a five-dimensional dynamic three-dimensional clutter map based on DDR3-SDRAM, which uses DDR3-SDRAM to establish a five-dimensional three-dimensional dynamic clutter map, which focuses on azimuth, pitch, distance, Doppler channel and PRF mode. Background technique [0002] The clutter map is the clutter intensity distribution map stored in the memory within the power range of the radar. It is a technology used to detect moving targets with extremely low Doppler frequency or suppress clutter. With the large-scale integrated circuit and modern radar With the development of radar, the research of clutter map has been paid more and more attention by radar designers. [0003] The modern radar signal processing system works for the clutter to a large extent. It records t...

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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