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Method for suppressing step frequency imaging distance sidelobe by means of cross-correlation function

A technology of cross-correlation function and distance sidelobe, which is applied in the field of array imaging, can solve problems such as the decrease of distance resolution, the widening of the composite signal distance from the main lobe, and the neglect of the cross-correlation function.

Inactive Publication Date: 2015-07-08
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, these methods tend to cause the range main lobe of the synthesized signal to widen, resulting in a decrease in range resolution
In addition, these methods only synthesize autocorrelation functions (or autofuzzy functions), ignore the role of cross-correlation functions and suppress them as interference

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  • Method for suppressing step frequency imaging distance sidelobe by means of cross-correlation function
  • Method for suppressing step frequency imaging distance sidelobe by means of cross-correlation function
  • Method for suppressing step frequency imaging distance sidelobe by means of cross-correlation function

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0027] Main content of the present invention has:

[0028] 1. Contrary to the traditional view that the cross-correlation function is harmful and needs to be suppressed, the present invention considers that the cross-correlation function can be exploited. The invention obtains a cross-correlation function with a certain height (the cross-correlation peak is greater than 0.1 times of the auto-correlation peak), and uses the cross-correlation function and the auto-correlation function to suppress the distance sidelobe of the synthetic correlation function. The specific method is to design a group of FM pulses as the transmission signal, and set the frequency bands of adjacent pulse signals to overlap each other, and set the frequency modulation direction to be opposite (in th...

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Abstract

The invention provides a method for suppressing step frequency imaging distance sidelobe by means of a cross-correlation function. According to the method, the cross-correlation function with a certain height is obtained, the distance sidelobe of a correlation function is obtained through co-suppression of the cross-correlation function and a self-correlation function, echoes of different LFM pulses are acquired, time delay between the LFM pulse echoes is removed, the echoes of all the LFM pulses are superimposed, and matched filtering, beam forming and intensity extraction are conducted on the superimposed echoes to obtain the image of a target. By the adoption of the method, the distance sidelobe of a composite signal can be effectively reduced.

Description

technical field [0001] The invention relates to an array imaging method. Background technique [0002] In array imaging technologies such as sonar, radar, and medicine, in order to improve the range resolution of the imaging system, it is necessary to use a transmission signal with a large bandwidth. However, a large bandwidth signal will increase the instantaneous bandwidth of the imaging system at the transmitting and receiving ends, thereby increasing the cost of system hardware. In order to overcome this shortcoming, the step frequency system (Gill G, Detection of targets embedded in clutter using frequency step waveform, Proceedings of the 1994 International Symposium on Noise and Clutter Rejection in Radars and Imaging Sensors, Kawasaki, Japan, 1994: 115. Liu Xiaohong , Signal Analysis and Processing of High Range Resolution Imaging Radar, Master Thesis of Xidian University, 2006) Multiple small bandwidth signals can be used to synthesize a signal with large bandwidth...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/89G01S7/41
CPCG01S7/41G01S13/89
Inventor 刘雄厚孙超杨益新卓颉
Owner NORTHWESTERN POLYTECHNICAL UNIV
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