Method for suppressing interference on wind profile radar

Abstract

The invention discloses a method for suppressing interference on wind profile radar. The method includes steps of firstly, selecting the optimal fractional order alpha<opt>; secondly, carrying out fractional Fourier transformation on coherent accumulative time-domain data under the condition of the optimal fractional order alpha<opt> to obtain corresponding fractional-domain signal forms; thirdly, determining clutter interference detection thresholds on the basis of statistic characteristics of all order moments of received signals in fractional-domains; fourthly, carrying out inverse fractional-domain Fourier transformation on suppressed data to obtain clutter-removed time-domain wind profile radar data so as to completely suppress and process clutter. The method has the advantages that the influence of wireless electric signals on the wind profile radar can be reduced after the received signals of the wind profile radar are processed by the aid of the method, the signal-to-noise ratios can be obviously improved, and the method is high in practicality.

Description

technical field [0001] The invention relates to the technical field of wind profile radar, in particular to a wind profile radar interference suppression method. Background technique [0002] Wind profiler radar is a remote sensing device for high-altitude wind field detection by transmitting electromagnetic beams in different directions to the high altitude, receiving and processing the information returned by these electromagnetic beams due to the uneven vertical structure of the atmosphere. Using the Doppler effect, the wind profiler radar can detect the changes of meteorological elements such as wind direction and wind speed over it with altitude, and has the advantages of high spatial and temporal resolution and high degree of automation. On the basis of the wind profile radar, the acoustic emission device is added to form a radio-acoustic detection system, which can remotely sense the vertical profile of the temperature in the atmosphere. Wind profiler radar has broad...

AI Technical Summary

Problems solved by technology

The echo signal power of the wind profiler radar is weak, while the amplitude of the ground clutter and intermittent clutter is several orders of magnitude higher than the wind signal, resulting in a low effective data rate of the wind profiler radar. In addition, due to the It is relatively close to the working frequency band of broadcasting and communication equipment, and the echo signal power of the wind profiler radar is weak, so it is easily interfered by radio waves. How to effectively suppress the influence of clutter and radio waves on the wind profiler radar needs to be solved urgently one of the puzzles

At present, wind profiler radar mainly adopts classical signal processing techniques, such as pulse compression coding, DC removal, spectrum accumulation, spectrum cancellation, etc. Although it has a certain suppression effect on active interference, the signal-to-interference ratio has little improvement and the effect is not obvious

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