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A method for identifying radar occlusion based on signal-to-noise ratio

A signal-to-noise ratio and radar technology, applied in the research field of radar signal processing, can solve problems such as inability to obtain accurate results, and achieve the effect of solving the problem of occlusion calculation, improving the accuracy of calculation, and having a high degree of automation

Active Publication Date: 2018-05-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, analyzing radar occlusion purely from DEM data, although it has high guiding value, cannot obtain accurate results

Method used

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  • A method for identifying radar occlusion based on signal-to-noise ratio
  • A method for identifying radar occlusion based on signal-to-noise ratio
  • A method for identifying radar occlusion based on signal-to-noise ratio

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Experimental program
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Embodiment Construction

[0024] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] Figure 1~5 Taking the occlusion situation of Nanjing Xianlin radar (installation height of 60m) in Jiangsu, China as an example, the calculation result is calculated using DEM data of 30m. The adopted scheme is as follows:

[0026] Turn off the radar transmitter, set the repetition period to 1000Hz, and set the pulse width to 0.5μs.

[0027] The elevation angle of the radar antenna is turned to 90°, that is, it is aimed at the zenith direction. The antenna is aimed at the zenith, because there must be no obstruction in the direction of the zenith, so as to determine a threshold value.

[0028] Set a radar volume scan mode, including the number of radar scan layers and the rotation speed of the radar antenna, so that the radar operates according to the set volume scan mode.

[0029] Save the IQ data output by the receiver, and sav...

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Abstract

The invention discloses a method for identifying radar shielding based on signal-to-noise ratio; the method comprises the steps: powering off a radar transmitter and setting parameters of radar transmission signal; setting the elevation angle of a radar antenna to be 90 degrees and transmitting electromagnetic waves for shielding; scanning in a body scanning mode by the radar; storing I / Q data of each elevation level received by a radar receiver; processing the I / Q data to obtain a noise power diagram output by the radar receiver when the radar antenna is located at different elevation angles and in different orientations; utilizing the confirmed threshold value and comparing signals received in any direction with the threshold value; if the signals exceed the threshold value, identifying that the shielding exists in the direction; and drawing a shielding diagram for the radar at different elevation angles and in different orientations according to the comparison result. Compared with the prior art, the computing precision is improved and the shielding calculation problem at short distances is solved.

Description

technical field [0001] The invention relates to a method for identifying the distribution of obstructions around a radar, in particular to a method for calculating and identifying the distribution of obstructions around a radar by using a signal-to-noise ratio (SNR, Signal to Noise Ratio), and belongs to the field of radar signal processing research. Background technique [0002] When selecting a site and building a fixed station radar, the primary consideration is the surrounding terrain and buildings. Excessive occlusion will greatly reduce the detection capability of the radar, so that the radar cannot play its original role, resulting in a waste of manpower and financial resources. For mobile radar, it is very important to choose an unobstructed observation site. Therefore, the calculation and recognition of radar occlusion is very important. [0003] There are many methods to identify the occlusion of ground objects, and the calculation based on digital elevation mode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/00G01S13/89
CPCG01S7/40
Inventor 赵坤杨正玮陈建军邵世卿黄浩温龙
Owner NANJING UNIV