Space-time coding-based frequency diversity array radar distance resolution enhancement method

Abstract

The invention belongs to the technical field of radar signal processing, and particularly discloses a space-time coding-based frequency diversity array radar distance resolution enhancement method, which comprises the following steps of transmitting a linear frequency modulation signal through a frequency diversity array, and obtaining an angle-frequency two-dimensional frequency spectrum of a transmitting directional diagram through a stationary phase principle, designing two-dimensional space-time coding by analyzing the linear relation between the angle and the frequency, shifting effective frequency bands corresponding to the pulses through the two-dimensional space-time coding, and improving the range resolution through coherent pulse accumulation synthesis bandwidth.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a frequency diversity array transmit diversity technology, specifically a space-time coding-based frequency diversity array radar range resolution enhancement method, which can be used for radar range resolution enhancement. Background technique [0002] The concept of frequency diversity array radar was proposed by Antonik and Wick et al. at the IEEE International Radar Conference. Compared with the traditional phased array radar with fixed transmission frequency and single-angle pointing transmission beam, there is a small frequency shift in the carrier frequency of the transmission signal between adjacent channels of frequency diversity array radar, which can form a distance-angle two-dimensional coupling Launch pattern. Compared with the transmission mode of the traditional multiple-input multiple-output MIMO radar orthogonal waveform group, each array elemen...

AI Technical Summary

Problems solved by technology

The transmission signal of the frequency diversity array is processed by matched filtering at the receiving end to form an equivalent transmission beam. The equivalent transmission bandwidth corresponding to the main lobe of the beam decreases compared with the transmission signal bandwidth, which directly leads to a decrease in distance resolution.

The decrease in distance resolution is not conducive to the high-precision parameter estimation of the target, and also makes it difficult for subsequent target detection, positioning and recognition.

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