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Pulse compression method of piecewise linear frequency modulation SAR

A piecewise linear and pulse compression technology, applied in the field of signal processing, can solve the problems of inconvenient SAR imaging processing, inability to obtain matched filter analytical expressions, etc., and achieve the effect of perfecting the generation method

Active Publication Date: 2022-08-09
AEROSPACE INFORMATION RES INST CAS
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AI Technical Summary

Problems solved by technology

At present, the matching filter generation method of the PLFM signal is: copy the pulse and perform discrete Fourier transform after zero padding, and then take the complex conjugate of the result. However, this method cannot obtain the analytical expression of the matched filter, so it is not convenient for subsequent SAR imaging processing

Method used

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  • Pulse compression method of piecewise linear frequency modulation SAR
  • Pulse compression method of piecewise linear frequency modulation SAR
  • Pulse compression method of piecewise linear frequency modulation SAR

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Experimental program
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Embodiment 1

[0155] The following combines figure 1 , Detailed description of the process of designed the segmented LFM signal of low -side petals in this embodiment.

[0156] First of all, determine the power spectrum function of the PLFM signal according to the peak side petals than PSLR (about -40 dB), so choose the Kaiser window ( β = 5.8) As a approximate power spectrum for the PLFM signal;

[0157] Then, the value points of the Kaiser window get the duration vector of the group;

[0158] Secondly, calculate the PLFM signal segmental frequency function and time domain expression based on the group delay vector;

[0159] Then, determine the signal spectrum and matching filter according to the PLFM signal;

[0160] Finally, pulse compression of the PLFM signal based on the matching filter.

[0161] The system parameters used in this implementation case are shown below:

[0162]

[0163] In order to evaluate the performance of the vein compression method of the invention, it compares it wi...

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Abstract

The invention discloses a pulse compression method of a piecewise linear frequency modulation SAR (Synthetic Aperture Radar). The method comprises the following steps: determining a power spectrum function of a piecewise linear frequency modulation signal according to a peak sidelobe ratio; integrating the power spectrum function to obtain a group delay vector; calculating a piecewise instantaneous frequency function and a time domain expression of the piecewise linear frequency modulation signal according to the group delay vector; determining a frequency spectrum and a matched filter according to the piecewise linear frequency modulation signal; and performing pulse compression on the piecewise linear frequency modulation signal according to a matched filter. By adopting the method provided by the invention, the frequency domain matched filter suitable for the piecewise linear frequency modulation SAR can be designed.

Description

Technical field [0001] The invention is a signal processing technology field, which involves a pulse compression method of a Piecewise Linearfrequency Modulation (PLFM) SAR. Background technique [0002] Synthetic Aperture Radar (SAR), as an active microwave imaging radar of all -day, all -weather, is widely used in terrain surveying and mapping, vegetation survey, resource detection, marine management, pollution monitoring, urban construction, deep space detection, etc. Many areas. At present, the LFM signal is the most commonly used transmitted waveform in the SAR system, but the peak of the LFM signal pulse compression result is high than the PSLR (about -13 dB), which will reduce the SAR system imaging performance. In order to suppress the peak side petals, weighted windows functions or filtering are usually used, but these methods will reduce the output signal -to -noise ratio (SNR). Compared with the LFM signal, the PLFM signal can obtain a very low beam level by regulating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/28
CPCG01S13/90G01S7/28
Inventor 张永伟王伟张志敏邓云凯
Owner AEROSPACE INFORMATION RES INST CAS
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