A Control System of Equivalent Sampling Ground Penetrating Radar with Variable Gain Based on cpld

Abstract

The invention belongs to the field of ground penetrating radars, and discloses a variable gain equivalent sampling ground penetrating radar control system based on a CPLD. The system comprises an upper computer, an MCU microprocessor, a CPLD, a delay trigger circuit, an analog-to-digital conversion module, a transmitting module and a receiving module, wherein the upper computer is used for sendingan instruction and receiving a signal; the MCU microprocessor is used for realizing information interaction between an upper computer and the CPLD, the analog-to-digital conversion module is used forconverting the received electromagnetic wave signal of the receiving module into a digital signal, the CPLD is used for setting the total number of times of transmitting and receiving the electromagnetic wave signals, the transmitting time interval, the receiving time interval and the gain multiplying power; the delay trigger circuit is used for controlling whether the transmitting module and thereceiving module transmit or receive signals; and the receiving module is used for realizing equivalent gain sampling. According to the invention, surface deep weak signals are acquired, and the parallel processing capability and the detection precision of the control system are improved.

Description

technical field [0001] The invention belongs to the field of ground penetrating radar, and more specifically relates to a CPLD-based variable gain equivalent sampling ground penetrating radar control system. Background technique [0002] Ground penetrating radar is widely used, including highway detection, underground non-destructive testing, void detection, layered positioning of bridge decks, underground pipeline detection, geological sediment detection, geological structure detection, determining the depth of bedrock and underground water tables, and the location of underground cultural relic structures Determination, life detection and mine detection, etc. [0003] The existing ground penetrating radar control system uses a microprocessor as the main controller of the system, and controls the working process of the radar through a software program. The system development cycle is short, but the microprocessor cannot achieve precise control of the system, and the paralle...

AI Technical Summary

Problems solved by technology

[0004] For the above defects or improvement needs of the prior art, the present invention provides a CPLD-based variable gain equivalent sampling ground penetrating radar control system, through the layout and design of the key components CPLD and variable gain unit in the control system, In particular, the CPLD is connected to the transmitting module, receiving module and analog-to-digital conversion module at the same time to realize the parallel operation of the transmitting module, receiving module and analog-to-digital conversion module without affecting each other, improving the parallel processing capability and precise control of the system, and realizing For the control of the transmitting module, the receiving module and the analog-to-digital conversion module, in addition, the variable gain unit increases the side gain of the electromagnetic wave signal received in different periods, so that the electromagnetic wave signal reflected in the deep layer of the ground to be detected can be collected, thereby solving the problem of ground penetrating radar. Large measurement errors and technical problems that cannot detect deep layers of the earth's surface

Images