Bistatic MIMO radar high-speed movement target parameter estimation method based on dual-frequency transmission

Abstract

The invention discloses a bistatic MIMO radar high-speed movement target parameter estimation method based on dual-frequency transmission. Echo signals of high-speed high-mobility targets are received through a receiving array of bistatic MIMO radar, and the echo signals of the receiving array are divided according to different carrier frequencies; conjugate multiplication is conducted on the two routes of echo data obtained through division, and whole cycle integration is conducted in a rapid time domain; Fourier conversion is conducted on the integrated data in a slow time domain, and each target speed is estimated; high-speed target matching filtering functions are set up; matching filtering is conducted on the echo signals of the receiving array to form a virtual array; the transmission angle of each target and the receiving angle of the target are estimated. The range walk of the high-speed targets is corrected according to the characteristic of the echo signals of the dual-frequency transmission MIMO radar, the problem that the parameter estimation performance is influenced by unstable factors such as Doppler spread and RCS rapid fluctuation is solved, and MIMO radar parameter estimation under the high-speed high-mobility targets is achieved.

Description

technical field [0001] The invention relates to the application field of a multiple-input multiple-output radar system, in particular to a parameter estimation method for a high-speed moving target of a bistatic MIMO radar based on dual-frequency transmission. Background technique [0002] Target detection is an important task of radar. However, in recent years, radars are facing serious challenges of high-speed and high-maneuvering targets, such as hypersonic and highly maneuvering fighter jets and missiles in the field of air defense, as well as orbital targets and space debris that need to be monitored when developing space resources. Modern radars usually use matched filtering and multi-pulse long-term coherent accumulation technology to improve the echo signal-to-noise ratio of low-observable targets, so as to achieve effective detection of low-speed moving targets. However, for high-speed and high-maneuvering targets, the high Doppler frequency it brings will cause se...

AI Technical Summary

Problems solved by technology

This method expands the Doppler tolerance of the matched filter by reducing the duration of the matched filter, but this sacrifices the performance of the matched filter, which also makes it difficult for the MIMO radar to effectively form a virtual array

Most of the existing distance walking correction methods usually require the target’s reflection cross-sectional area (RCS) to remain constant during the echo accumulation time. The wave phase changes randomly, which affects the correction effect of the target echo envelope movement, so it will reduce the multi-dimensional parameter estimation performance of MIMO radar for high-speed targets

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