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Super-resolution imaging method of forward-looking radar

An imaging method and super-resolution technology, applied in the field of forward-looking radar super-resolution imaging, can solve problems such as loss of high-frequency information of echo signals, achieve good resolution performance, and suppress amplification and transmission.

Pending Publication Date: 2019-05-03
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low-pass effect of the radar antenna pattern, the high-frequency information of the echo signal is lost, and the amount of information in the imaging scene will be greater than the amount of information in the echo signal, resulting in deconvolution called an ill-conditioned problem.

Method used

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  • Super-resolution imaging method of forward-looking radar

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Embodiment Construction

[0052]Below in conjunction with accompanying drawing and example, describe technical scheme of the present invention in detail

[0053] Assume that the imaging scene is 5km in front of the radar, the imaging range is plus or minus 10 degrees, the bandwidth of the radar transmission signal is 200MHZ, the time width is 0.005ms, the pulse repetition period is 1ms, and the scanning speed of the antenna is 100 degrees per second. The imaging process is as follows:

[0054] 1. Generate a chirp signal according to step 1, as follows:

[0055]

[0056] 2. According to step 2, perform range pulse compression processing on the echo signal.

[0057] 3. Perform distance migration correction on the echo in the frequency domain according to step 3, and the distance migration correction factor is:

[0058]

[0059] Calibration result as Figure 4 .

[0060] 4. Construct a convolution measurement matrix using the antenna pattern according to step 4.

[0061] 5. According to step fi...

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Abstract

The invention, which belongs to the technical field of forward-looking radar imaging, in particular relates to a super-resolution imaging method of a forward-looking radar. According to the invention,an azimuth deconvolution model is constructed; and a singular value being obvious to noise amplification in an iterative process is found out from the perspective of the mathematics, so that the amplification transmission of the noise in the iterative process is suppressed. Therefore, the deconvolution has the better resolution performance in realizing radar super-resolution imaging.

Description

technical field [0001] The invention belongs to the technical field of forward-looking radar imaging, and specifically relates to a forward-looking radar super-resolution imaging method. Background technique [0002] Compared with radars of other imaging systems, radar forward-looking imaging has an urgent need to improve the super-resolution capability of radar forward-looking field in the fields of precision guidance, autonomous landing and terrain avoidance. Therefore, forward-looking radar super-resolution imaging has great research significance. Forward-looking imaging radar is to image the fan-shaped area directly in front of the radar aircraft's track direction, and the azimuth direction is almost perpendicular to the track direction, so the Doppler frequency is very small, and the accumulated Doppler bandwidth is also small, resulting in forward-looking The imaging azimuth resolution is very low. Therefore, how to achieve forward-looking radar super-resolution imag...

Claims

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Application Information

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IPC IPC(8): G01S13/89
Inventor 宗竹林舒兆炜
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA