Large dynamic ground penetrating radar sampling front-end delay equivalent sampling method and circuit

Abstract

The invention relates to a large dynamic ground penetrating radar sampling front-end delay equivalent sampling method and circuit, which belong to the technical field of ground penetrating. Sampling pulse sequence, performing gain-controlled amplification control on the echo signal to obtain a gain-controlled echo amplified signal; using delayed sampling pulse sequence, performing sampling time control and digital processing on the echo amplified signal to obtain a digital echo signal ; Wherein the time-delayed sampling pulse sequence is a stepping pulse sequence delayed sequentially relative to the trigger signal or a pulse sequence with adjustable delay time relative to the trigger signal. The invention simplifies the design of the delay circuit of the ground penetrating radar, realizes the delay adjustment, facilitates matching of the echo signals of the ground penetrating radar in different frequency bands, and simultaneously satisfies the requirements of a high equivalent sampling rate and a wide time window for deep detection, It is suitable for the equivalent sampling of ground penetrating radar.

Description

technical field [0001] The invention relates to the field of ground penetrating technology, in particular to a large dynamic ground penetrating radar sampling front-end delay equivalent sampling method and circuit. Background technique [0002] Most ground penetrating radars use the non-carrier frequency impulse system. With the current technical level, direct real-time sampling of nanosecond-level narrow pulses requires expensive ultra-high-speed analog-to-digital conversion chips and memory. Therefore, engineering implementation generally follows the equivalent Sampling principle for equivalent sampling. [0003] At present, the delay system commonly used in ground penetrating radar is the fast and slow ramp comparison timing circuit. This circuit is mainly composed of a fast ramp circuit, a ladder wave circuit and a high-speed comparator. The timing accuracy and stability of this method depend on External capacitors, although high-quality capacitors can be used, but thei...

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Problems solved by technology

[0004] In view of the above-mentioned analysis, the present invention aims to provide a large dynamic ground penetrating radar sampling front-end delay equivalent sampling method and circuit, which solves the problem that the traditional ground penetrating radar sampling time window is small, and can be applied to ground penetrating radar to detect deep layers Acquisition of echo signals to improve detection depth

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