Matched filtering method and device for synthesizing bore diameter laser radar non-linearity chirp

A synthetic aperture laser and matched filtering technology, which is applied in measuring devices, radio wave measuring systems, electromagnetic wave re-radiation, etc., can solve the problems of large amount of phase error calculations, and achieve improved imaging resolution, easy implementation, and reliable principles Effect

Inactive Publication Date: 2009-07-29
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

Compared with the matching channel scheme, the unmatched channel scheme is flexible in design and more suitable for practical applications in the field, but the calculation amount is relatively large when extracting phase error, phase shift calculation and nonlinear chirp compensation

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  • Matched filtering method and device for synthesizing bore diameter laser radar non-linearity chirp
  • Matched filtering method and device for synthesizing bore diameter laser radar non-linearity chirp
  • Matched filtering method and device for synthesizing bore diameter laser radar non-linearity chirp

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention should not be limited thereby.

[0022] see first figure 1 , it can be seen from the figure that the matched filter device for nonlinear chirp of synthetic aperture lidar in the present invention includes:

[0023] The local oscillating laser light source 1 splits four optical signals through the light splitting device 4: the reference emission signal 2, the reference local oscillation signal 5, the target emission signal 3 and the target local oscillation signal 6;

[0024] There are reference channel, reference local oscillator channel and target local oscillator channel, and satisfy τ rLo =τ zLo , τ r =τ s , where: τrLo is the time delay of the reference local oscillator channel, τ zLo is the time delay of the target LO channel, τ r is the time delay of the reference channel, τ s is the...

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Abstract

The invention provides a match filtering method and a device used for a synthetic aperture laser radar nonlinear chirp. The method comprises the following steps: an additional reference channel is arranged outside a target channel, the frequency domain conversion result of the quadratic high-order terms in heterodyne receiving signal phase difference of the reference channel is corrected so as to lead the index quadratic term of the frequency domain signal and the index quadratic term in the frequency domain signal in the target channel to form an index conjugated pair, and subsequently the convolution operation is carried out to the corrected frequency domain signal in the reference channel and the frequency domain signal in the target channel (wherein, the index quadratic term becomes a pulse function after being multiplied), thus overcoming the effects of the laser source nonlinear chirp. The method and the device overcome the nonlinear chirp phase error of the laser source and improve the range resolution of the synthetic aperture laser radar imaging.

Description

technical field [0001] The invention relates to a synthetic aperture laser radar, which is a synthetic aperture laser radar nonlinear chirp matching filter method and device in synthetic aperture laser radar imaging. The nonlinear chirp of the light source is realized by performing matching filtering on the difference frequency signal spectrum. The effect of chirp is compensated, the nonlinear effect of chirp is suppressed in the heterodyne signal, and the range to high resolution of synthetic aperture lidar imaging is improved. Background technique [0002] Synthetic aperture lidar is a high-resolution imaging radar that uses a laser light source as a radiation source. It uses the movement of a small-aperture optical antenna to synthesize a large aperture to obtain high-resolution images. The transmitting and receiving devices of the radar system are loaded on the same moving platform, and the real sampling aperture transmits pulses at each sampling position and receives th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/48G01S17/89
Inventor 鲁伟刘立人许楠
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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