Stepping delay pulse acquisition method and system in equivalent sampling

Abstract

The invention provides a stepping delay pulse acquisition method and system in equivalent sampling, and belongs to the technical field of ground penetrating radars. The stepping delay pulse acquisition method comprises the following steps of: S1) in response to a trigger pulse, generating a single-cycle sinusoidal signal according to a preset rule; S2) shifting the single-period sinusoidal signal to a preset reference voltage; S3) converting the shifted single-cycle sinusoidal signal into a square wave signal; S4) outputting a stepping delay pulse along a falling edge of the square wave signal; and S5) repeating the steps S1 to S4) to obtain continuous stepping delay pulses. According to the stepping delay pulse acquisition method and the system, the high-precision stepping delay pulse is obtained by utilizing the high-frequency resolution characteristic of the DDS chip, so that high-precision equivalent sampling is realized. Therefore, the pS level, even the sub-pS level, of the stepping time delay can be easily achieved, and the equivalent sampling precision can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of ground penetrating radar, in particular to a method for acquiring step-delay pulses in equivalent sampling and a system for acquiring step-delay pulses in equivalent sampling. Background technique [0002] The equivalent sampling method is a conventional method for collecting the echo signal of the existing ground penetrating radar. This method collects a sample point every signal cycle or every few signal cycles, and recombines the collected sample points according to a certain arrangement. A new signal is formed, the shape of the newly formed signal is similar to the original sampled signal, and the time width of the newly formed signal is several times higher than that of the original sampled signal, thereby reducing the frequency of the sampled signal. The accuracy of the equivalent sampling depends on the accuracy and precision of the step-delay pulse, and the different generation methods of the step...

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Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a method and system for obtaining step delay pulses in equivalent sampling, so as to at least solve the problems of poor precision and large step delay distance in the process of generating step delay in the prior art

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