Detection device for high-frequency pseudo-random (PN) spread spectrum (SS) coded sequence signal of shallow geologic body and method using the same

Patent metadata

Field	Value
Publication number	US-12523792-B2
Application number	US-202318520524-A
Country	US
Kind code	B2
Filing date	Nov 27, 2023
Priority date	May 15, 2023
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A detection device for high-frequency pseudo-random spread spectrum coded sequence signal of shallow geologic body includes a signal transmitter and a synchronous signal receiver. The signal transmitter includes a first Mono-Chip Computer (MCU), a first Field Programmable Gate Array (FPGA), a power amplifier module, a direct-current (DC) power supply, a first display module, a first Global Position System (GPS) synchronization module, a first communication module, and a first memory module. The synchronous signal receiver includes a preamplifier circuit, a bandpass filter circuit, a program-controlled amplifier circuit, an analog to digital (AD) converter circuit, a second FPGA, a second MCU, a second communication module, a second display module, a second GPS synchronization module, and a second memory module. A method using the detection device is further provided.

First claim

What is claimed is:

1 . A detection device for high-frequency pseudo-random (PN) spread spectrum (SS) coded sequence signal of shallow geologic body, comprising:
a signal transmitter; and a synchronous signal receiver; wherein the signal transmitter comprises a first Mono-Chip Computer (MCU), a first Field Programmable Gate Array (FPGA), a power amplifier module, a direct-current (DC) power supply, a first display module, a first Global Position System (GPS) synchronization module, a first communication module, and a first memory module; the first MCU is connected to the first display module, the first communication module, the first GPS synchronization module, the first FPGA, and the power amplifier module; the DC power supply is connected to the power amplifier module; and the power amplifier module is connected to the first FPGA; the first FPGA is configured for collecting in real time output voltage information and output current information and storing the output voltage information and output current information in the first memory module connected to the first FPGA; and the power amplifier module is configured for outputting a pseudo-random combined rectangular wave signal to ground through a first ground electrode and a second ground electrode to form a transmitter circuit; the synchronous signal receiver comprises a preamplifier circuit, a bandpass filter circuit, a program-controlled amplifier circuit, an analog to digital (AD) converter circuit, a second FPGA, a second MCU, a second communication module, a second display module, a second GPS synchronization module, and a second memory module; the second MCU is connected to the second communication module, the second display module, the second GPS synchronization module, and the second FPGA, and the program-controlled amplifier circuit; and the second FPGA is further connected to the second memory module; a first receiving electrode and a second receiving electrode are configured to acquire a frequency response signal of geoelectricity; the first receiving electrode and the second receiving electrode are connected to the preamplifier circuit; the frequency response signal passes through the bandpass filter circuit, the program-controlled amplifier circuit, the AD converter circuit and is performed with a high-speed process, so as to obtain a processed frequency response signal; and the second FPGA is configured to store the processed frequency response signal; the signal transmitter is configured to generate a pseudo-random combined rectangular wave signal in a frequency range of 1 KHz to 300 KHz based on a spread spectrum coded frequency division band; the pseudo-random combined rectangular wave signal is performed with power amplification to be supplied to ground through the first ground electrode and the second ground electrode to form the transmitter circuit; the first FPGA is configured to record in real time voltage information, current information, and time information of an output coded signal; and the synchronous signal receiver is configured to arrange the first receiving electrode and the second receiving electrode on a parallel line of a straight line formed by the first ground electrode and the second ground electrode; the frequency response signal acquired by the first receiving electrode and the second receiving electrode is captured and stored by the synchronous signal receiver and processed by a computer, so as to form geoelectric structure information.

2 . The detection device of claim 1 , wherein when a lowest frequency is fixed, an inverse repeated m-sequence is spread based on a spread spectrum, so as to generate two groups of pseudo-random spreading coded signals with a signal frequency range of 1 KHz to 300 KHz; a code element frequency for a spreading sequence signal is ½ of that of the inverse repeated m-sequence; and a frequency point density of the spreading sequence signal is two times of that of the inverse repeated m-sequence.

3 . The detection device of claim 1 , wherein a plurality of ultra-audio frequencies are coded to form a single simultaneous generation, transmission and reception of pseudo-random spread spectrum coded sequence signal.

4 . The detection device of claim 1 , wherein a detection operation is based on a shallow area within an underground depth of 2-100 m.

5 . A method using the detection device of claim 1 , comprising:
(1) laying the first ground electrode and the second ground electrode according to a detection design requirement; lowering a connecting resistance of the first ground electrode and the second ground electrode by pouring water; connecting a ground electrode connecting wire to the first ground electrode and the second ground electrode; and measuring a first resistance value of the first ground electrode, the second ground electrode, and a connecting circuit; (2) connecting the DC power supply to an input terminal of the power amplifier module; checking a polarity of the DC power supply; and connecting the ground electrode connecting wire to an output terminal of the power amplifier module; (3) warming the signal transmitter up; checking connection status of the input terminal of the power amplifier module, the output terminal of the power amplifier module, the first ground electrode, the second ground electrode, and the ground electrode connecting wire; and measure a second resistance value of the first ground electrode, the second ground electrode, and the connecting circuit; (4) after warming the signal transmitter up for 5 minutes, generating and transmitting a high-frequency pseudo-random sequence signal generated based on spread spectrum coding; and adjusting output voltage to a set detection voltage to ensure continuous transmission output; (5) after synchronizing the synchronous signal receiver, picking up and checking a geoelectric signal; if the geoelectric signal is ok, start a collecting work; (6) connecting the synchronous signal receiver to an upper personal computer (PC) through a communication port; and uploading a measurement data to the upper PC for subsequent processing; (7) uploading output signal voltage data and output signal current data stored in the signal transmitter to the upper PC; and (8) calculating section information of an underground resistivity of a detection area in the upper PC; and making corresponding geological interpretation after map processing.

Assignees

• Univ Hunan Science & Technology

Inventors

• Cheng Hui
• Jia Chenxing
• Li Diquan
• Fu Guohong
• Liao Xiuying

Classifications

• H03K19/21 Primary

  EXCLUSIVE-OR circuits, i.e. giving output if input signal exists at only one input; COINCIDENCE circuits, i.e. giving output only if all input signals are identical · CPC title

• H03K19/177

  arranged in matrix form · CPC title

• G01V3/02 Primary

  operating with propagation of electric current · CPC title

• Y02A90/30

  Assessment of water resources · CPC title

• H03M1/12

  Analogue/digital converters ({H03M1/001 – } H03M1/10 take precedence) · CPC title