Method for designing MIMO radar waveforms

Abstract

The invention discloses a method for designing MIMO radar waveforms. The method mainly solves the problem in the prior art that tolerance of Doppler is poor in the process of waveform design. The implementation steps of the method include the first step of fixing a set of waveform center frequency sequences of a radar and setting an initial phase to be zero, the second step of searching a frequency interval initial variable to find out a frequency interval initial value which satisfies the requirement that the 3dB bandwidth of an emitted energy function equals to the 3dB bandwidth of an ideal emitted energy function, the third step of setting a frequency interval according to the frequency interval initial value, the fourth step of inputting the frequency interval and the initial phase and outputting an emitted energy function difference value, emitting direction sidelobe gain and the sidelobe magnitude of signals after pulse synthesis to construct a cost function, the fifth step of calling the cost function and optimizing the cost function through the minimax method to obtain the frequency interval and the initial phase meeting the requirement, and the sixth step of obtaining a set of final signals according to the frequency interval and the initial phase and completing the design of the waveforms. The waveforms designed through the method have the advantages of being good in the tolerance of the Doppler and applicable to target detection.

Description

technical field [0001] The invention belongs to the technical field of radar, and relates to a design method of MIMO radar waveform, which can be used for target detection. Background technique [0002] Multiple-input-output MIMO radar is a new active detection technology. Its radiating antenna and receiving antenna can be flexibly arranged according to system requirements and each radiating unit can emit different signal waveforms. Transmit waveforms include quadrature waveforms and cross-correlation waveforms, and cross-correlation waveforms are usually required. MIMO radar can flexibly design cross-correlation waveforms by using the waveform diversity capability, so that the energy of electromagnetic waves can be focused on the target or area of ​​interest, so that electromagnetic energy can be effectively used and unnecessary clutter interference can be suppressed. In order to better design cross-correlation waveforms, the current design process is mainly as follows: f...

AI Technical Summary

Problems solved by technology

This method has a lower peak sidelobe level of the transmitted energy function, but also has the problem of high computational complexity

[0005] The above two methods have poor Doppler tolerance due to the use of phase encoding, especially when the target speed is high, the pulse comprehensive processing of the target echo signal will be seriously mismatched, and the target cannot be detected

Images