Signal processing method of conical scanning high-resolution microwave scatterometer

A microwave scatterometer and high-resolution technology, which is applied in the field of microwave remote sensing, can solve the problems that the conical scanning high-resolution microwave scatterometer signal cannot be processed, and the azimuth processing is not performed, so as to reduce the antenna size and improve the azimuth resolution. Effect

Active Publication Date: 2010-03-17
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0008] Depend on figure 1 , figure 2 and image 3 The existing conical scanning microwave scatterometer signal processing methods are only for d

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  • Signal processing method of conical scanning high-resolution microwave scatterometer
  • Signal processing method of conical scanning high-resolution microwave scatterometer
  • Signal processing method of conical scanning high-resolution microwave scatterometer

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Embodiment Construction

[0047] The radio frequency transmitting end of the conical scanning microwave scatterometer needs to transmit broadband signals (such as LFM signals) with different center frequencies or coding methods in a coherent pulse train, so that the distance direction can be resolved by filtering and the Doppler frequency Pre-compensation, the frequency of compensation is the Doppler shift corresponding to the proximal end of the first range resolution unit.

[0048] Such as Figure 8 Shown, signal processing method of the present invention is:

[0049] 1) Collect the echo or internal calibration signal of the cone-scanning high-resolution microwave scatterometer through A / D, and perform direct digital down-conversion processing on the signal collected by A / D. The processed signal is divided into two channels, and one channel is transmitted to the noise channel , and the other is sent to the signal channel. can also be like Figure 9 As shown, the direct digital down-conversion proc...

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Abstract

The invention provides a signal processing method of a conical scanning high-resolution microwave scatterometer, which realizes azimuth high-resolution signal processing by the steps of echo (or internal calibration) signal acquiring, direct digital down-conversion (DDC) processing, narrowband distance filtering, distance de-chirping, distance fast Fourier transform (FFT), azimuth Doppler filtering, azimuth high-resolution processing (Doppler processing or deconvolution processing), modulus square processing, real-time frequency locating (required by fan beams but not by pencil beams), accumulating and the like. By adopting DBS or deconvolution processing in the azimuth direction, the method can improve the azimuth resolution and avoid adopting large-size antennae. The method solves the problem of distance ambiguity by adopting distance filtering and solves the problem of Doppler ambiguity by adopting azimuth filtering and can further decrease the size of the antennae so that the method can adopt DBS processing to improve the azimuth resolution in the form of small-size antennae.

Description

technical field [0001] The invention relates to a microwave scatterometer signal processing method, in particular to a novel system microwave scatterometer azimuth high-resolution signal processing method, which belongs to the field of microwave remote sensing technology. Background technique [0002] A microwave scatterometer is a typical radar system that measures the backscatter coefficient σ of a target surface. The main purpose of the spaceborne microwave scatterometer is to measure the sea surface wind field. It is currently an important remote sensing instrument that can simultaneously measure the sea surface wind speed and wind direction. The spaceborne microwave scatterometers currently in orbit or under development at home and abroad have three systems: fixed fan beam, conical scanning pencil beam and conical scanning fan beam. count. The space-borne conical scanning high-resolution microwave scatterometer is a new type of microwave scatterometer proposed by fore...

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Application Information

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IPC IPC(8): G01S7/28G01S13/95
CPCY02A90/10
Inventor 王万林刘丽霞王旭艳田栋轩陈文新
Owner XIAN INSTITUE OF SPACE RADIO TECH
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