Joint optimal criterion based waveform design method of cognitive synthetic aperture radar (SAR)

A technology of synthetic aperture radar and waveform design, applied in the field of radar, can solve the problems of low resolution performance of waveform, failure to consider SAR, and inability to apply high resolution imaging and detection tasks, etc., to achieve good resolution performance and suppress noise.

Active Publication Date: 2019-08-20
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

Although these waveform design methods have improved the radar's cognitive ability and noise suppression ability, they have not considered the actual working requirements of SAR, and the designed waveforms generally have low resolution performance, which cannot be applied to high-resolution imaging and noise suppression in SAR. detection mission

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  • Joint optimal criterion based waveform design method of cognitive synthetic aperture radar (SAR)
  • Joint optimal criterion based waveform design method of cognitive synthetic aperture radar (SAR)
  • Joint optimal criterion based waveform design method of cognitive synthetic aperture radar (SAR)

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Embodiment Construction

[0042] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0043] Such as figure 1 Shown, a kind of cognitive synthetic aperture radar waveform design method based on joint optimal criterion of the present invention comprises the following steps:

[0044] S1. Initialize system parameters; initialized parameters include transmit waveform bandwidth B, environmental clutter power spectral density P c (f), noise power spectral density Pn (f), target response function G(f);

[0045] S2. According to the requirements of maximizing the echo SCNR and minimizing the delay resolution constant, the joint optimal criterion objective function is constructed, and the joint optimal criterion optimization problem is constructed under the condition of energy constraints; the constructed joint optimal criterion objective function is:

[0046]

[0047]

[0048] F(f) represents the frequency domain expression of ...

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Abstract

The invention provides a joint optimal criterion based waveform design method of a cognitive SAR. The method comprises the following steps that S1) a system parameter is initialized; S2) a joint optimal criterion objective function is established to maximize the echo SCNR and minimizing a time delay distinguishing constant; S3) a Lagrange multiplier method is used to convert the constraint optimization problem in the step S2) into a constraint-free optimization problem; S4) the constraint-free optimization problem in the step S3) is solved to obtain an expression of the optimal emission waveform based on the joint optimal criterion; and S5) according to an energy constraint condition, a Lagrange multiplier of the optimal emission waveform based on the joint optimal criterion in the step S4) is solved, and the optimal waveform is obtained. The emission waveform of the SAR is designed to use environment and target information, clutters are inhibited in the emission end, the SAR has a cognition capability, and the designed cognitive SAR has a higher distinguishing performance while inhibiting noises.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a cognitive synthetic aperture radar waveform design method based on a joint optimal criterion. Background technique [0002] Synthetic Aperture Radar (SAR) has the characteristics of all-day, all-weather, and high-resolution, and can complete high-resolution imaging of the ground and target detection tasks. It uses the relative motion between the radar antenna and the target area to obtain high spatial resolution. Synthetic aperture radar has played an increasingly important role in the fields of terrain surveying and mapping, vegetation analysis, ocean and hydrological observation, environment and disaster monitoring, resource exploration, and detection of small changes in the earth's crust. [0003] When the conventional SAR works, it transmits the preset waveform and processes the received echo according to the preset mode, so as to complete the imaging detection of the obser...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/90
Inventor 李中余徐玛菲杜宁武俊杰杨海光杨建宇
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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