Research And Implementation Of Array Ground Penetrating Radar Filter Denoising Technology

Along with the vigorous development of China's economy,as one of the lifeblood of national economic development,highway construction has also made a leap-forward development in recent years.However,in the process of using the road,the safety of roads such as road collapse is becoming more and more serious.Therefore,it is necessary to carry out certain detection of the road to eliminate safety hazards.Traditional detection methods have great limitations and cause certain physical damage to the road.As a representative of non-destructive detecting technology,ground penetrating radar has been widely used in highway detecting because of its fast detection speed and high accuracy.Different from the general ground penetrating radar,the vehicle-mounted ground penetrating radar designed with array antenna is studied in this paper,which has faster detection speed and larger detection area.In the process of collecting echo data,the ground penetrating radar will inevitably introduce the influence of noise,which greatly increases the difficulty of post-imaging interpretation and reduces the accuracy of target recognition.Therefore,this paper mainly focuses on the target echo.Research and implementation of filtering denoising technology.The array ground penetrating radar data acquisition board studied in this paper uses the Kintex-7 series FPGA as the main control chip.In order to realize the acquisition of high frequency echo signals,the design of the delay circuit is used to make the trigger signal acting on the transceiver antenna.The dynamic adjustable delay is generated,so that the radar generates the delayed pulse signal,and finally the radar echo signal is collected by the equivalent sampling method;and the configuration of the transmitting and receiving antenna is realized,and the working mode of one-shot and double-receiving is realized.The direct wave energy in the radar echo signal is the strongest.When the detected target is in the shallower underground position,the echo of the effective target will be submerged in the direct wave.Therefore,the mean method is used to average the offset method and the singular value is used.The decomposition method achieves the removal of direct waves.For the non-stationary signal of the ground penetrating radar,the wavelet transform method is used to process the echo data.The noise component is mainly concentrated in the high frequency part of the wavelet coefficient,and the wavelet threshold is used to denoise.The method performs preliminary denoising on the noisy echo signals and uses various threshold function methods.Because the wavelet threshold denoising method alone has the defect of incomplete denoising,the idea of introducing Wiener filtering in the wavelet domain combines the advantages of both Wiener filtering and wavelet denoising.The final experimental results also illustrate this.The joint denoising algorithm can effectively protect the useful target signal information while effectively removing noise.