Non-orthogonal multi-carrier phase coded radar system

Abstract

The invention discloses a non-orthogonal multi-carrier phase coded radar system. MCPC (multi-carrier phase coded) broadband radar signals adjusted through EBPSK (Extended Binary Phase Shift Keying) are adopted. According to the non-orthogonal multi-carrier phase coded radar system, firstly, the generalized likelihood ratio detection algorithm is adopted to primarily detect whether a target exists or not; secondly, an optimal radar transmitted waveform with maximized mutual information between echo signals and the target impact response is designed according to the differences between an extended type target and various frequency subcarrier scattering coefficients, and the target frequency domain scattering coefficient with the minimum error of mean square is estimated by adjusting the transmitted power of various subcarriers of the MCPC signals modulated through the EBPSK to approach the theoretical optimal waveform; thirdly, the frequency spectrum structure of the radar transmitted waveform is further optimized and designed, the subcarrier frequencies with the large scattering coefficient are preferentially selected, and the number of the optimal subcarriers is worked out; lastly, the radar transmitted waveform with the maximized signal to noise ratio of the echo signals is optimized and designed according to the estimated target impact response so that the constant false-alarm detecting probability of the target can be maximized, and the continuously-updating and adjusting process continues to be carried out.

Description

technical field [0001] The present invention relates to a non-orthogonal multi-carrier phase coded (Multi-Carrier Phase Coded, MCPC) radar system, which comprehensively considers the radar system's detection and estimation of extended targets, and integrates the adaptive optimization design theory of radar waveforms, In order to improve the target detection and scattering parameter estimation performance of the radar system as a whole, it belongs to the radar engineering technology. Background technique [0002] 1. Introduction to radar system [0003] The selection of radar transmission waveform affects the amount of information contained in the echo, which is directly related to the performance of radar monitoring, estimation, imaging, tracking and interference suppression. Adaptively select the transmission waveform according to the radar working environment, which is conducive to the radar extracting more and more accurate target information from the echo in the best wa...

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Problems solved by technology

[0045] 2. Under the condition that the target is initially detected, it is necessary to design the optimal radar transmission waveform so that the waveform contains the most target impulse response information, thereby improving the estimation performance of the extended target scattering characteristics; however, it is limited by the radar system Waveform generation conditions, not all signal waveform radar systems can be easily generated, it is necessary to design radar waveforms that are easy to generate;

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