Optimal design method of missile-borne MIMO (Multiple-Input Multiple-Output) radar waveform covariance matrix

Abstract

The invention discloses an optimal design method of a missile-borne MIMO (Multiple-Input Multiple-Output) radar waveform covariance matrix. The main idea comprises the steps of determining missile-borne MIMO radar, wherein there is a target and clutter within a detection range of the missile-borne MIMO radar; recording echo signals received by the missile-borne MIMO radar when detecting the targetto be echo signals received by the missile-borne MIMO radar in a clutter environment, wherein the echo signals received by the missile-borne MIMO radar in the clutter environment comprise target signal, clutter signals and noise signals, and determining a transmitted waveform vector s of the missile-borne MIMO radar; setting a linear filter weight vector, and calculating to acquire a joint optimization problem of the transmitted waveform vector of the missile-borne MIMO radar and the linear filter weight vector in the clutter environment according to the transmitted waveform vector s; and acquiring an optimal design result of the missile-borne MIMO radar covariance matrix according to the joint optimization problem of the transmitted waveform vector of the missile-borne MIMO radar and thelinear filter weight vector in the clutter environment.

Description

technical field [0001] The invention belongs to the field of radar technology, and in particular relates to an optimal design method of a missile-borne MIMO radar waveform covariance matrix, which is suitable for suppressing clutter by using a multi-carrier signal system, that is, by jointly optimizing the method of transmitting waveforms and receiving filters to ensure that missiles are completed Accurately strike and effectively improve the anti-clutter capability of the terminal guidance stage. Background technique [0002] Missile-borne radar echo target detection is a key link in missile terminal guidance. The electromagnetic environment of the current battlefield is complex, and it is difficult to obtain sufficient target information under the influence of strong clutter from fixed missile-borne radar transmission waveforms, which seriously affects the guidance performance of the seeker; An important direction for the future development of missile-borne radar is to rea...

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Problems solved by technology

[0004] In recent years, scholars at home and abroad have carried out a lot of research on the optimization of radar target detection performance based on waveform design theory. Moran and Sira et al. designed and optimized waveforms based on ambiguity function theory. By aligning the groove of the ambiguity function side lobe with strong clutter, Reduce the influence of clutter and improve the signal-to-clutter ratio, but a large number of parameters need to be called, and the calculation complexity is high, which cannot meet the real-time requirements of cognitive radar; optimization, but this method does not consider the influence of environmental clutter; Sadjad et al. designed a fixed-form transmit waveform covariance matrix with the goal of maximizing the output SINR, but this method is only suitable for discontinuous strong clutter In the case of wave points, and without considering the target Doppler; Wang Peng et al. proposed a radar with 9 subcarriers in their paper "Orthogonal Multi-Carrier Radar Waveform Design Suitable for Missile Platforms" Waveform design method, which adopts pulse-to-pulse waveform agility and subcarrier frequency domain weighting technology, but this method is only designed for the transmit waveform, without considering the joint optimization of the receiver, and is only applicable to the collaborative work of multiple missile-borne radars ; Northwest University Yan Qing and others proposed a high-speed missile-borne radar waveform design method in the patent "A high-speed missile-borne radar waveform design method" (application number: 201710154330.X, publication number: 106940442). Mainly through the technology of millimeter wave, large bandwidth, stepping frequency and high repetition frequency, it solves the phenomenon that the signal-to-noise ratio decreases, the main lobe clutter Doppler spectral width broadens, and the high-speed movement between the missile and the target causes the target to move beyond the distance. However, the method is still limited to single carrier frequency waveforms

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