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Cognitive Synthetic Aperture Radar Waveform Design Method Based on Joint Optimal Criterion

A synthetic aperture radar and waveform design technology, applied in the field of radar, can solve the problems of low-resolution waveform performance, SAR is not considered, and cannot be applied to high-resolution imaging and detection tasks, and achieves good resolution performance and suppresses noise.

Active Publication Date: 2021-03-16
UNIV OF ELECTRONICS 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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  • Cognitive Synthetic Aperture Radar Waveform Design Method Based on Joint Optimal Criterion
  • Cognitive Synthetic Aperture Radar Waveform Design Method Based on Joint Optimal Criterion
  • Cognitive Synthetic Aperture Radar Waveform Design Method Based on Joint Optimal Criterion

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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 As shown, a kind of cognitive synthetic aperture radar waveform design method based on the 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 express...

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Abstract

The present invention provides a cognitive synthetic aperture radar waveform design method based on the joint optimal criterion, including the following steps: S1, initializing system parameters; S2, constructing a joint according to the requirements of maximizing echo SCNR and minimizing delay resolution constant Optimal criterion objective function; S3, using the Lagrange multiplier method to convert the constrained optimization problem in step S2 into an unconstrained optimization problem; S4, solving the unconstrained optimization problem in step S3, and obtaining An expression of the optimal transmit waveform of the criterion; S5. According to the energy constraint condition, solve the Lagrangian multipliers of the optimal transmit waveform based on the joint optimal criterion in step S4 to obtain the optimal waveform. The present invention introduces the use of environment and target information by designing the transmission waveform of SAR, and suppresses clutter at the transmitting end, so that SAR has cognitive ability, and the designed cognitive SAR has better resolution while suppressing clutter performance.

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...

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Application Information

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Patent Type & Authority Patents(China)
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 ELECTRONICS SCI & TECH OF CHINA
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