Waveform design method, computer equipment and storage medium
A waveform and combined waveform technology, applied in the computer field, can solve the problems of large time-bandwidth product, poor imaging performance, low peak-to-average ratio, etc., and achieve the effect of good imaging performance
Active Publication Date: 2020-12-01
长沙莫之比智能科技有限公司
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[0003] Applying the sub-chirp (chirp) combined waveform set to MIMO SAR imaging can meet the characteristics of the waveform with good autocorrelation / cross-correlation performance, large time-width-bandwidth product, and low peak-to-average ratio. However, the current sub-chirp combined waveform The sub-chirp combination waveform set obtained by the design method has poor imaging performance when applied to MIMO SAR imaging
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[0037] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0038] This application provides a waveform design method, such as figure 1 As shown, it is a schematic flowchart of the steps of the waveform design method in an embodiment, including step S110 to step S150.
[0039] Step S110, after performing time-frequency grid division on the combined sub-chirp waveform base, obtaining a first preset number of sub-chirp waveforms.
[0040] Wherein, the sub-chirp combination waveform is defined as follows: a multi-carrier frequency segmental linear frequency modulation (LFM) waveform comprising P sub-carrier frequencies and L sub-time...
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The invention provides a waveform design method, a computer device and a storage medium, the method comprises the following steps: after time-frequency grid division is carried out on a sub-chirp combined waveform base, a first preset number of sub-chirp waveforms are obtained; chaotic mapping is carried out on the first preset number of sub-chirp waveforms to obtain a first preset number of frequency coding sequences; after constructing a chaotic sequence matrix based on the first preset number of frequency coding sequences, a waveform modulation matrix based on the chaotic sequence matrix isgenerated; when a waveform set corresponding to the generated waveform modulation matrix meets an optimization termination condition, a sequence is selected from the waveform modulation matrix, and afinal optimization waveform is obtained based on the sub-chirp waveform corresponding to each element of the sequence; and returning to the step of acquiring the first preset number of sub-chirp waveforms is carried out when a waveform set corresponding to the generated waveform modulation matrix does not meet the optimization termination condition. Through the waveform design method, the waveform can be optimally designed to obtain an optimized waveform with good imaging performance.
Description
technical field [0001] The present application relates to the field of computer technology, in particular to a waveform design method, computer equipment and computer storage media. Background technique [0002] Radar waveform design is always an important research content. The waveform's time-width-bandwidth product, ambiguity function, peak-to-average ratio and other properties greatly affect the radar system performance and imaging effect. MIMO SAR (Multiple-Input Multiple-Output Synthetic Aperture Radar) achieves more equivalent channels than the actual aperture through multiple transmission and multiple reception. In theory, it can have great advantages in applications such as imaging and target detection. However, its efficient waveform design remains a challenge. It can be said that the optimal design of the orthogonal waveform set is the basis for MIMO SAR to exert its advantages. [0003] Applying the sub-chirp (chirp) combined waveform set to MIMO SAR imaging can...
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IPC IPC(8): G01S7/02
CPCG01S7/02
Inventor 陈浩文
Owner 长沙莫之比智能科技有限公司