Ground clutter recognition method

A technology of ground clutter and identification method, applied in the field of radar, can solve the problems of inability to eliminate super-refraction, large amount of calculation, damage to precipitation echo, etc., and achieve the effect of avoiding loss, small amount of calculation, and efficient identification

Inactive Publication Date: 2013-01-16
BEIJING METABTAR RADAR
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Problems solved by technology

[0005] The embodiment of the present invention provides a method for identifying ground clutter to solve the problems of damage to precipitation echoes, inability to eliminate super-refraction, and large and complex calculations in the prior art

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Embodiment 1

[0010] Please refer to figure 1 , an embodiment of the present invention provides a method for identifying ground clutter, including:

[0011] 101. Check the signal-to-noise ratio of the radar echo signal, and judge whether the signal-to-noise ratio is less than 3dB.

[0012] In radar echo signal processing, the small range units divided by distance along the ray direction are called range bins. In the present embodiment, at first check the signal-to-noise ratio corresponding to the radar echo signal of each distance storehouse, if signal-to-noise ratio 3dB before subsequent processing.

[0013] 102. If the signal-to-noise ratio is less than 3dB, calculate the three characteristic quantities TDBZ, SPIN and CPA of the radar echo signal, among which, TDBZ selects the 9 distance libraries centered on the current distance library, and SPIN selects the current distance library as the center 11 distance libraries.

[0014] If the signal-to-noise ratio of the radar echo signal is...

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Abstract

The invention discloses a ground clutter recognition method, which comprises the following steps of: detecting a signal-noise ratio of a radar echo signal and judging whether the signal-noise ratio is less than 3 dB; if the signal-noise ratio is less than 3 dB, calculating three characteristic quantities TDBZ, SPIN and CPA (Clutter Phase Alignment) of the radar echo signal, wherein nine range bins with a current range bin as center are selected by TDBZ and 11 range bins with the current range bin as center are selected by SPIN; converting each characteristic quantity into a value of 0-1 through a respective membership function respectively; calculating the three characteristic quantities with values of 0-1 by applying fuzzy logic to obtain ground clutter probability; and judging the ground clutter probability by using a certain threshold value to obtain a ground clutter recognition result. According to the technical scheme provided by the embodiment of the invention, the ground clutter can be efficiently recognized, super refraction is adaptively treated, the calculation is low, real-time operation at a radar signal processing front end can be realized, and the loss of a weather signal can be avoided.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a method for identifying ground object clutter. Background technique [0002] Ground clutter refers to the echoes generated by ground objects and buildings near the radar station, which are characterized by low elevation angles. In weather radar signal processing, the detection and filtering of ground clutter is very important. Ground clutter will pollute radar data and cover up weather signals, resulting in the degradation of radar data quality. [0003] There are two current solutions. One is to use a fifth-order elliptic filter for time-domain filtering based on the static clutter map. The other is to use a frequency-domain filter for full-range filtering. These two methods are based on the fact that the average radial velocity of ground clutter is zero, but both have their own defects. [0004] Among them, the disadvantage of the first method is that the time-domain filteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 孙召平张持岸钟涛
Owner BEIJING METABTAR RADAR
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