Moving target detection method based on FDA-MIMO

Abstract

The present invention relates to radar technology. And discloses a moving target detection method based on FDA-MIMO, and performs detection aiming at a radial moving target. The method comprises following steps: a. establishing an echo signal model, wherein the echo signal model consists M transmitting array elements and N receiving array elements, with an array element spacing d equal to Lambada / 2, Lambada being a wavelength; and an offset frequency of transmitting signals of the adjacent array elements in the M transmitting array elements is Delta f; b. performing intermediate frequency sampling and storage on echo signals received by the N receiving array elements; c. matching and filtering the signals received by the N receiving array elements through using reference waveforms corresponding to the transmitting array elements; and d, performing distance migration correction on the filtered signals, and detecting the moving target; and wherein, M and N are integers, and M is equal toor greater than 2, and N is equal to or greater than 2. The method has the beneficial effects that the multiple array elements is adopted to receive at a receiving end and a corresponding reference waveform of each transmitting orthogonal waveform is used for matching and filtering, then keystone transform is performed, and pulses after each pulse pressure are translated to an initial position, to perform phase coherent integration, greatly improving detectable signal to noise ratio.

Description

technical field [0001] The present invention relates to the technical field of radar moving target detection, in particular to a technique for improving the detection signal-to-noise ratio of weak and low-observable moving targets by combining Frequency Diversity Array (FDA, Frequency Diverse Array) and multiple-input multiple-output (MIMO) technology. It is a moving target detection method based on FDA-MIMO (Frequency Controlled Array - Multiple Input Multiple Output Radar System). Background technique [0002] In 2006, Antonik and Wicks first proposed the Frequency diverse array (FDA) radar concept at the International Radar Conference and applied for a US patent. Unlike phased array radar, it has a distance-dependent beam, so it has been widely concerned by the academic community once it was proposed. The literal translation of Frequency Diverse Array should be frequency diversity array, but it still emits coherent signals, but it is controlled by adding a small frequenc...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the frequency control array radar detection does not consider the target motion noise cross-distance unit, the invention proposes to use the FDA-MIMO radar system combined with the keystone algorithm to improve the detection signal-to-noise ratio

Images