Method, device and storage medium for generating multi-degree-of-freedom FM signal

Abstract

The present application discloses a method for generating a multi-degree-of-freedom FM signal. The method includes: constructing a time-domain function of the multi-degree-of-freedom FM signal based on a piecewise nonlinear function; , determine the impulse response width IRW and the peak side lobe ratio PSLR in the autocorrelation function performance of the multi-degree-of-freedom FM signal, and establish a signal optimization model based on the IRW and the PSLR; based on the signal optimization model, determine the increase The algorithm model of wide Lagrangian genetic algorithm; According to the selected window function and the stationary phase principle POSP, determine the initialization frequency modulation control point of multi-degree-of-freedom frequency modulation signal; Utilize the time domain function of described multi-degree-of-freedom frequency modulation signal and the obtained The algorithm model of the augmented Lagrangian genetic algorithm is used to continuously iterate on the control points of the initial modulation frequency of the multi-degree-of-freedom frequency modulation signal until the augmented Lagrangian genetic algorithm converges.

Description

technical field [0001] The present application relates to the field of radar transmission signals, and relates to, but is not limited to, a method, device and storage medium for generating a multi-degree-of-freedom frequency modulation signal. Background technique [0002] With the development of high-resolution radar satellites, a large number of spaceborne synthetic aperture radar (Synthetic ApertureRadar, SAR) have been used in the field of remote sensing, such as TerraSAR-X, Sentinel-1 and COSMO-SkyMed. Conventional SAR systems use Linear Frequency Modulation (LFM) signals as transmit waveforms, resulting in high sidelobe levels, which can interfere with or even cover scatterers near the target. In order to suppress the high sidelobes generated by the target, the LFM signal is usually windowed. However, the windowing operation will make the filtering process no longer accurately match the signal, thereby reducing the Signal-Noise Ratio (SNR) of the radar system. In ord...

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Problems solved by technology

[0003] However, in the prior art, in the process of using multi-degree-of-freedom FM signals, it will inevitably cause the broadening of the main lobe while reducing the side lobe level, and the broadening of the main lobe will lead to a decrease in the resolution of the multi-degree-of-freedom FM signals , thereby reducing the imaging quality of SAR images

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