Synthetic aperture radar coherent pulse signal generation method

Abstract

The invention belongs to the field of radar system design, and particularly relates to a synthetic aperture radar coherent pulse signal generation method. The method comprises the following steps: step 1, waveform parameters of radar signals in an imaging mode are obtained, the waveform parameters of the radar signals are sent to a signal generation unit, and the signal generation unit receives and stores the waveform parameters of the radar signals; step 2, the signal generation unit detects the frame pulse signal of the timer in real time, and after the frame pulse signal is detected, the signal generation unit generates a PRF signal according to the waveform parameter of the radar signal and the frame pulse signal; and step 3, the signal generation unit generates a coherent pulse signal according to the waveform parameters of the PRF signal and the radar signal, sends the coherent pulse signal to the emission unit, amplifies the coherent pulse signal, and then radiates the coherent pulse signal through an antenna. The stability of the radar imaging function can be greatly improved, the image obtained after radar imaging is good in focusing and free of ghosting, and the radar image quality can be effectively improved.

Description

technical field [0001] The application belongs to the field of radar system design, in particular to a synthetic aperture radar coherent pulse signal generation method. Background technique [0002] Synthetic aperture radar is widely used in terrain surveying and mapping. When working, the radar continuously transmits multiple coherent pulse signals and receives echo signals. By synthesizing the echo signals, a well-focused terrain image is obtained. During the signal acquisition process of each frame of radar image, a high degree of coherence should be maintained between different pulse signals emitted by the radar, so that the radar can perform subsequent imaging processing. The coherence between pulse signals requires that different pulses have the same initial phase during a frame of image. The coherent pulse signal is generated by the signal generation unit based on the PRF signal of the timer. The timer and the signal generation unit in the synthetic aperture radar ar...

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Problems solved by technology

[0003] The traditional coherent pulse signal generation method has the following disadvantages: because the PRF signal generated by the timer is an unideal rectangular wave in practice, the rising edge of the rectangular wave has a certain width, and due to its own factors and external interference, the timing signal may have a certain The jitter, the signal generation unit sometimes has a sampling clock deviation when sampling and detecting it, which will cause a sampling time interval deviation between adjacent pulse signals generated, resulting in the radar sampling the echo signal When , there will be a certain deviation between adjacent pulses, the coherence between different pulse signals during a frame of image will become worse, and the radar image after imaging processing will appear ghosting and defocusing

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