CN215682300U - Underground space tunnel geological exploration transceiver tester - Google Patents
Underground space tunnel geological exploration transceiver tester Download PDFInfo
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- CN215682300U CN215682300U CN202122218287.3U CN202122218287U CN215682300U CN 215682300 U CN215682300 U CN 215682300U CN 202122218287 U CN202122218287 U CN 202122218287U CN 215682300 U CN215682300 U CN 215682300U
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Abstract
The utility model provides a geological detection transceiver tester for an underground space roadway, which comprises: the system comprises a microprocessor unit, a transmitter, a receiver, a human-computer interaction GUI interface and a WiFi module; the microprocessor unit is respectively connected with the transmitter, the receiver, the human-computer interaction GUI interface and the WiFi module; the transmitter and the receiver are integrated transceiver machines, share one loop antenna, the mode is selected through a human-computer interaction GUI interface and comprises a transmitting mode and a receiving mode, the microprocessor unit switches the gear switch according to the selected mode, the loop antenna is connected with the corresponding impedance matching network according to the mode, so that the underground space roadway geological detection signal is transmitted or received, and the WiFi module outputs the received underground space roadway geological detection signal to the upper computer for displaying. The utility model integrally sets the transmitter and the receiver, adopts a digital signal processing mode, has flexible mode switching and simple hardware structure, shortens the development period and improves the signal receiving and transmitting efficiency.
Description
Technical Field
The utility model belongs to the field of geological exploration, and particularly belongs to a geological detection transceiver tester for an underground space roadway.
Background
The method for detecting the geological structure in the closed underground space through wireless communication transceiving is a main research direction of the current geological structure detection. However, because the underground space is different from a common wireless transmission channel, the formation shielding is serious, the geological formation detection is not suitable for common high-frequency signals to transmit, and a middle-frequency band and a low-frequency band with longer wavelengths are required to be adopted, so that the problems of large signal attenuation and serious multipath interference exist, the influence of noise and interference is very obvious in the process of receiving and transmitting signals, and the design of a high-sensitivity detection device is difficult.
The geological structure detector is mainly used for development detection of coal measure strata, and is based on the principle of reflected wave seismic exploration, and a receiving and transmitting device is arranged in a mine roadway space. The transmitting end transmits 100K-3M high-power medium-frequency wave signals, the signals penetrate through a geological layer, reflected echoes are received at the receiving end, and when poor geological bodies exist in the geological layer, elastic differences exist among media, so that a good physical premise is provided for generation and transmission of reflected waves. And obtaining basic data of the geological structure through different echo characteristics of the electromagnetic waves at the stratum interface. The time-distance curve of the reflection wave of the interface at the periphery of the roadway has a clear rule, and if the reflection wave of the geological abnormal interface at the head-on front of the roadway is represented as a negative apparent velocity characteristic.
The existing geological structure detector has the following technical problems:
1. the transmitter and the receiver are built by adopting discrete elements such as a triode, an adjustable capacitor and an adjustable inductor, the transmitted power can be very large, but the debugging is very difficult, the final performance is greatly influenced along with the aging of part of elements, and certain problems exist in the stability and the reliability of the transmitter and the receiver.
2. For the transmitter, since the frequencies of the local oscillator signal and the crystal oscillator are fixed, the carrier frequency of the transmitter is fixed, and thus cannot be adjusted for different geological environments (because the echo characteristic sensitivities of different media for different frequencies are different).
3. The transmitter and the receiver are two independent instruments, and development and use are inconvenient.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems, the utility model provides the design requirements and technical indexes of a geological detection and transceiving integrated tester (geological structure detector for short) for underground space roadway: namely, the transmitting power of the transmitter is more than 20W (belonging to the ultra-high power transmitting category), the sensitivity of the receiver is better than 0.05uV (ultra-high sensitivity), the dynamic range of the receiver is more than 120dB, and the maximum transmission distance reaches 300 m.
The utility model provides a geological detection transceiver tester for an underground space roadway, which comprises: the system comprises a microprocessor unit, a transmitter, a receiver, a human-computer interaction GUI interface and a WiFi module;
the microprocessor unit is respectively connected with the transmitter, the receiver, the human-computer interaction GUI interface and the WiFi module;
the transmitter and the receiver are integrated transceiver machines and share one loop antenna, the human-computer interaction GUI interface is used for selecting modes and comprises a transmitting mode and a receiving mode, the microprocessor unit is used for switching a gear switch according to the selected mode, so that the loop antenna is connected with a corresponding impedance matching network according to the mode to transmit or receive underground space roadway geological detection signals, and the WiFi module is used for outputting the received underground space roadway geological detection signals to an upper computer for display.
Further, the transmitter includes: the DDS signal generator, the power amplifier and the transmitting end impedance matching network;
the input end of the DDS signal generator is connected with the microprocessor unit, the output end of the DDS signal generator is connected with the input end of the power amplifier, the output end of the power amplifier is connected with the input end of the transmitting end impedance matching network, and the output end of the transmitting end impedance matching network is connected with the input end of the loop antenna.
Further, the receiver includes: the system comprises an automatic gain control module AGC, a low noise amplifier module LNA, a receiving end impedance matching network, a low pass filter module LPF and a high-speed analog-to-digital conversion module ADC;
the output end of the loop antenna is connected with the input end of the receiving end impedance matching network, the output end of the receiving end impedance matching network is connected with the input end of the low noise amplifier module LNA, the output end of the low noise amplifier module LNA is connected with the first input end of the automatic gain control module AGC, the microprocessor unit is connected with the second input end of the automatic gain control module AGC, the output end of the automatic gain control module AGC is connected with the input end of the low pass filter module LPF, the output end of the low pass filter module LPF is connected with the input end of the high-speed analog-to-digital conversion module ADC, and the output end of the high-speed analog-to-digital conversion module ADC is connected with the microprocessor unit.
Further, the human-computer interaction GUI interface employs a touchable screen, the touchable screen comprising: the device comprises a waveform display module, a mode switching module and a frequency point selection module; the waveform display module is used for displaying data waveforms and data results, the mode switching module is used for switching the transmitting mode and the receiving mode, and the frequency point selection module is used for selecting the frequency of transmitting signals.
Further, the DDS signal generator comprises an AD9851 chip.
Further, the power amplifier comprises a THS3091 chip and a BUF634 chip, and the THS3091 chip and the BUF634 chip are connected in parallel to increase driving energy.
Further, the low noise amplifier module LNA comprises an AD8429 chip, which AD8429 chip is connected with a voltage follower AD 817.
Further, the automatic gain control module AGC comprises a VCA810 chip, can be adjusted between-40 dB and 40dB, and has a control voltage of-2V to 0V.
Further, the low pass filter module LPF employs an eighth-order butterworth-bessel filter, and includes two dual-operational amplifier AD8032 chips.
Furthermore, the high-speed analog-to-digital conversion module ADC adopts a 65MHz high-speed sampling AD chip, and the microprocessor unit adopts a single chip microcomputer or an FPGA.
The technical scheme provided by the utility model has the beneficial effects that:
the transmitter and the receiver are integrated, a ring gain antenna is shared, mode switching is flexible, the transmitter part directly controls the DDS signal generator through the microprocessor unit, any needed waveform can be generated, the receiver part directly amplifies and filters received signals, analog signals are converted into digital signals for sampling, data streams are filtered through programs of the microprocessor unit, useful signals are extracted, and follow-up algorithm processing is conducted, therefore, the traditional complex frequency conversion process is not needed, the hardware structure is simple, the development period is shortened, the signal receiving and sending efficiency is improved, the use is convenient, and secondary development is easy to conduct.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a structural frame diagram of an underground space roadway geological exploration transceiver tester of the present invention;
fig. 2 is a circuit schematic of the power amplifier of the present invention;
FIG. 3 is a circuit schematic of the low noise amplifier module LNA of the present invention;
FIG. 4 is a circuit schematic of the automatic gain control module AGC of the present invention;
FIG. 5 is a circuit schematic of the low pass filter module LPF of the present invention;
FIG. 6 is a schematic circuit diagram of the high speed ADC module of the present invention;
fig. 7 is a circuit schematic of the microprocessor unit of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The working principle of geological advanced detection of the underground space roadway adopts a three-component reflection seismic method, and the working principle of geological advanced detection of the underground space roadway adopts an echo measurement principle like other reflection seismic methods. The seismic waves are generated by small-dose excitation at a designated seismic source point. The seismic waves propagate in the coal rock in the form of spherical waves, and when meeting petrophysical interfaces (namely wave impedance difference interfaces such as faults, rock breaking zones, collapse columns and other structures), a part of seismic signals are reflected back, and a part of signals are refracted into a front medium. The reflected seismic signals are received by highly sensitive geophones.
Based on above-mentioned theory of operation, this embodiment has provided an underground space tunnel geology detects transceiver test appearance, as shown in fig. 1, this underground space tunnel geology detects transceiver test appearance includes: the system comprises a microprocessor unit, a transmitter, a receiver, a human-computer interaction GUI interface and a WiFi module;
the microprocessor unit is respectively connected with the transmitter, the receiver, the human-computer interaction GUI interface and the WiFi module;
the transmitter and the receiver are integrated transceiver machines, share a loop antenna, the mode is selected through the man-machine interaction GUI interface and comprises a transmitting mode and a receiving mode, the microprocessor unit switches a gear switch according to the selected mode, the loop antenna is connected with a corresponding impedance matching network according to the mode, so that underground space roadway geological detection signals are transmitted or received, and the WiFi module outputs the received underground space roadway geological detection signals to the upper computer for display.
In this embodiment, the transmitter includes: the DDS signal generator, the power amplifier and the transmitting end impedance matching network;
the input end of the DDS signal generator is connected with the microprocessor unit, the output end of the DDS signal generator is connected with the input end of the power amplifier, the output end of the power amplifier is connected with the input end of the transmitting end impedance matching network, and the output end of the transmitting end impedance matching network is connected with the input end of the loop antenna.
Specifically, in this embodiment, the DDS signal generator adopts an AD9851 chip of AD company, and the microprocessor unit MCU adopts a single chip microcomputer (but not limited thereto, an FPGA may also be used). Considering that the system needs to change the frequency of the transmitting signals according to the formation transmission conditions, the transmitting frequency is adjustable in 88K, 158K, 365K and 956K positions, and therefore the system is realized by adopting a scheme that the human-computer interaction GUI interface is adjustable.
The power amplifier adopts THS3091 and BUF634 chips of TI company, firstly amplifies a small signal to about 28Vpp through a current feedback amplifier supplied by wide voltage, and then sends the small signal to a load antenna through a power output stage connected in parallel.
The BUF634 is connected into a feedback loop, the offset voltage and distortion are reduced by using feedback, the BUF634 also has two characteristics of broadband and large current output, and the embodiment uses 3 (or even more) BUFs 634 to be connected in parallel to complete power driving, so that the current output on each BUF634 is reduced. The 50 ohm resistance between the two stages is to isolate the THS3091 output stage from the BUF634 input parasitic capacitance.
As shown in fig. 2, the front-stage current feedback amplifier is driven in parallel, so that the current on each chip is as small as possible, the rear-stage power driving stage is also driven in parallel by a plurality of BUFs 634, so that the driving capability is improved, when a 5-ohm dummy load is connected, the signal is not output in a distorted manner, the effective value of the current is 1.85A, the effective value of the voltage is 9.27V, and the total power is more than 15W.
The signal output by the signal generator DDS is connected with JP1 of the power amplifier, wherein R9 is input signal impedance matching resistors R11, R7, R12, R8 and R10 are reserved element positions of a pi-type impedance matching network. The THS3091 and the BUF634 are connected in parallel to increase the driving capability. R3, R6, R15 are all 50 Ω resistance, can play the effect of impedance matching, also can keep apart THS3091 output stage and BUF634 input parasitic capacitance simultaneously. The amplification factor is jointly determined by R1, R2, R4 and R5, and R13 and R14, wherein three paths of output signals are superposed to enhance the driving capability, and the amplitudes of the signals are amplified by 8 times in the same structure. Then enters a BUF634 parallel current driving link and finally is output to an antenna through an impedance matching network.
In this embodiment, the receiver includes: the system comprises an automatic gain control module AGC, a low noise amplifier module LNA, a receiving end impedance matching network, a low pass filter module LPF and a high-speed analog-to-digital conversion module ADC;
the output end of the loop antenna is connected with the input end of the receiving end impedance matching network, the output end of the receiving end impedance matching network is connected with the input end of the low noise amplifier module LNA, the output end of the low noise amplifier module LNA is connected with the first input end of the automatic gain control module AGC, the microprocessor unit is connected with the second input end of the automatic gain control module AGC, the output end of the automatic gain control module AGC is connected with the input end of the low pass filter module LPF, the output end of the low pass filter module LPF is connected with the input end of the high-speed analog-to-digital conversion module ADC, and the output end of the high-speed analog-to-digital conversion module ADC is connected with the microprocessor unit.
Compared with the traditional analog receiver, the utility model greatly simplifies the received data processing flow and reduces the noise and distortion caused by excessive signal processing. And the analog device which is originally needed is subjected to down conversion for several times, and after the radar signal is directly demodulated in a coherent mode, the high-speed analog-to-digital conversion module ADC is directly used for signal acquisition, and the signal is converted into a digital signal and then is subjected to algorithm analysis processing. The core part of the receiver comprises: the automatic gain control module AGC, the low noise amplifier module LNA, the receiving end impedance matching network, the low pass filter module LPF and the high speed analog-to-digital conversion module ADC, and the microcontroller and the VCA810 perform feedback adjustment in time, so that the automatic gain control module AGC forms a complete closed-loop control system.
In particular, the low noise amplifier module LNA is intended to use the AD8429 chip of the AD company. The high CMRR of the AD8429 prevents unnecessary signal corruption from acquisition. The CMRR increases with increasing gain. The high performance pin configuration AD8429 allows for reliably maintaining a high CMRR at frequencies well above those typical instrumentation amplifiers.
The schematic diagram of the design circuit is shown in FIG. 3: the circuit structure is double-signal differential input, if the signal is single input, the signal is input through JP1, JP3 is grounded, and the position of C6 is directly grounded. Wherein R3, R4 and R5 are signal impedance matching resistors, and RP1 is a set gain adjustment potentiometer.
E1, E2, E3, E4, C1, C2, C3, C4, C5, C6, C7 and C8 are all filter capacitors. The rear stage operational amplifier AD817 is a voltage follower, wherein R1 is open-circuit, and R2 is 0 ohm. The amplifier can also be a post-stage amplifier, and the amplification factor is 1+ R2/R1; the signal output of the low noise amplifier is JP 2. L1, C9 and L2, C10 constitute power supply L type filter network respectively for the power supply noise is little that the fortune is put. The power supply indicating module is composed of R6, R6, LED1 and LED2, and displays the normal operation state of the circuit.
In the embodiment, STM32F103C8T6 and VCA810 are adopted as core components to form an automatic gain control module AGC, and an amplifier with output amplitude maintaining, step-by-step adjustment and arbitrarily set automatic gain control is designed and realized. After passing through the low noise amplifier, the signal enters a14 dB front stage buffer amplifier stage, the single chip microcomputer performs ADC sampling on the signal, determines the amplitude range, selects a proper control signal to act on the program control gain amplifier stage, and finally passes through a 20dB rear stage buffer amplifier stage. The schematic diagram of the circuit is shown in fig. 4.
The pre-stage buffer amplifier adopts an OPA843 chip, the circuit is an in-phase proportional amplifying circuit, the amplification factor is 5 times, namely 14dB, and the R15 is used for impedance matching of front and rear stages. R12 and R6 are gain adjusting resistors, and the gain relation is A1-1 + R6/R12; c7, C11, C13 and C17 are all power supply filter capacitors.
The program control gain Amplifier (AGC) adopts a VCA810 chip, can be adjusted between-40 dB and 40dB, and has control voltage of-2V to 0V, so that an inverter is required to be connected with a DA port of the singlechip at the periphery. R15 and R20 are 1:1 attenuation voltage division units, the gain is-6 dB, and C8, C12, C14 and C18 are power supply filter capacitors. R3, R10, R16 are peripheral resistance units of VCA 810.
When the signal is amplified in the later stage, the amplitude of the signal is already large, so the signal also needs to pass through a 1:1 attenuation voltage division unit consisting of R11 and R18, and the gain of the signal is-6 dB. And then, forming an in-phase proportional amplifier by a common operational amplifier, wherein the amplification factor is 1+ R4/R7, namely 5 times or 14 dB. C6, C10, C16 and C20 are all power supply filter capacitors.
The signal input port is an IN-SMB base, and the output port is an OUT-SMB base. R19 and R14 are voltage-dividing attenuation resistors having the same resistance as the signal line.
In this embodiment, the LPF mainly functions to select useful signals and shield out-of-band noise. In this embodiment, an eighth-order butterworth bessel filter is designed, the cut-off frequency is 1MHz, and the circuit is shown in fig. 5. An eight-order filter circuit can be formed by adopting 2 AD double-operational amplifier AD 8032. The whole structure is designed in a capacitance feedback mode, and the actual measurement effect is ideal. Wherein C1(A, B, C, D) are feedback branch capacitors, and form filter elements together with R1(A, B, C, D) and R2(A, B, C, D), and C2(A, B, C, D) are ground bypass capacitors, which can filter high-frequency noise introduced in the circuit process. U1D is the first stage of signal input, second order low pass filtering, U1(A, B, C, D) together form an eighth order Butterworth-Bessel filter.
In this embodiment, the high-speed analog-to-digital conversion module ADC employs a 65MHz high-speed sampling AD chip, and the peripheral circuit is simple, as shown in fig. 6, an ADC-capture is a signal acquisition port. The resistors R37 and R38 form a 10-time attenuation circuit, and the voltage stabilizing diodes D3 and D6 form a pair tube to protect the input signal from exceeding a limit value. U6(AD8065) is a subtraction circuit, and the voltage of the signal with the negative signal is increased, so that the whole signal is in the range of 0-3.3V. The TL072 operational amplifier plays a role of a voltage following and phase inverter, inverts the reference voltage by 180 degrees to be-2V, and then inputs the inverted reference voltage and a signal into a subtraction amplifying circuit formed by U6, so that the signal of the TL072 operational amplifier obtains a direct current bias and achieves the aim that all signals are integer values. The AD9226 is driven by the time sequence that the microprocessor applies a pulse signal with a specific frequency to the CLK pin, and each time one pulse signal is applied, the 12-bit data bit of the chip outputs parallel data. Pin 1 of CLK of AD9226 is connected to PA2 of the microprocessor. The data pins BT1-BT12 (No. 2-13 pins) are connected with the PC0-PC12 of the microprocessor, and the OTR of the AD9226 is a measuring range exceeding signal pin.
In this embodiment, the microprocessor unit is an STM32F 103-series single chip microcomputer of ARM corporation, and as shown in fig. 7, the periphery includes a crystal oscillator circuit, a key reset circuit, and an ST-Link download circuit. The RST of the reset circuit is connected with a PC5 (No. 25 pin) of the microprocessor, and the ST-Link download circuit is respectively connected with a PA13 and a PA14 of the microprocessor. The crystal oscillator circuit is respectively connected with the PC14, the PC15, the PD0 and the PD1 of the microprocessor.
In this embodiment, the human-computer interaction GUI interface employs a touchable screen, which includes: the device comprises a waveform display module, a mode switching module and a frequency point selection module; the waveform display module is used for displaying data waveforms and data results, the mode switching module is used for switching the transmitting mode and the receiving mode, and the frequency point selection module is used for selecting the frequency of transmitting signals. The touchable screen adopts a serial port communication protocol, two-way transmission of communication data can be realized by two lines of TX and RX, a data waveform and a data result can be displayed, and a transmitting mode, a receiving mode, a transmitting signal frequency value and the like can be switched in a touching mode. RX and TX of the serial port screen are respectively connected with PB10 and PB11 pins of the microcontroller.
The microprocessor unit MCU controls the signal generator DDS to send out a radar pulse signal with a set frequency according to the set condition on the touchable screen, and the radar pulse signal is amplified by the power amplifier and then transmitted by the gain loop antenna. After receiving signals through the gain loop antenna, a receiving end performs pre-amplification through a low noise amplifier module LNA, performs gain variable amplification through an automatic gain control module AGC, amplifies the signals with different sizes within the sampling range of the high-speed analog-to-digital conversion module ADC, performs low-pass filtering through a low-pass filter module LPF, and after filtering out-of-band noise, a microprocessor unit MCU controls the high-speed analog-to-digital conversion module ADC to perform sampling.
The utility model provides a geological detection transceiver integrated tester for an underground space roadway, which integrates a transmitter and a receiver, shares a ring gain antenna, is flexible in mode switching, the transmitter part directly controls a DDS signal generator through a microprocessor unit and can generate a required arbitrary waveform, the receiver part directly amplifies and filters received signals, converts analog signals into digital signals for sampling, filters data streams through programs of the microprocessor unit, extracts useful signals and processes subsequent algorithms, and therefore, the traditional complex frequency conversion process is not needed, the hardware structure is simple, the development period is shortened, the signal transceiving efficiency is improved, the use is convenient, and secondary development is easy.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third and the like do not denote any order, but rather the words first, second and the like may be interpreted as indicating any order.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides an underground space tunnel geology is surveyed and is received and dispatched all-in-one tester which characterized in that includes: the system comprises a microprocessor unit, a transmitter, a receiver, a human-computer interaction GUI interface and a WiFi module;
the microprocessor unit is respectively connected with the transmitter, the receiver, the human-computer interaction GUI interface and the WiFi module;
the transmitter and the receiver are integrated transceiver machines and share one loop antenna, the human-computer interaction GUI interface is used for selecting modes and comprises a transmitting mode and a receiving mode, the microprocessor unit is used for switching a gear switch according to the selected mode, so that the loop antenna is connected with a corresponding impedance matching network according to the mode to transmit or receive underground space roadway geological detection signals, and the WiFi module is used for outputting the received underground space roadway geological detection signals to an upper computer for display.
2. The underground space roadway geological exploration transceiver tester as claimed in claim 1, wherein said transmitter comprises: the DDS signal generator, the power amplifier and the transmitting end impedance matching network;
the input end of the DDS signal generator is connected with the microprocessor unit, the output end of the DDS signal generator is connected with the input end of the power amplifier, the output end of the power amplifier is connected with the input end of the transmitting end impedance matching network, and the output end of the transmitting end impedance matching network is connected with the input end of the loop antenna.
3. The underground space roadway geological exploration transceiver tester as claimed in claim 1, wherein said receiver comprises: the system comprises an automatic gain control module AGC, a low noise amplifier module LNA, a receiving end impedance matching network, a low pass filter module LPF and a high-speed analog-to-digital conversion module ADC;
the output end of the loop antenna is connected with the input end of the receiving end impedance matching network, the output end of the receiving end impedance matching network is connected with the input end of the low noise amplifier module LNA, the output end of the low noise amplifier module LNA is connected with the first input end of the automatic gain control module AGC, the microprocessor unit is connected with the second input end of the automatic gain control module AGC, the output end of the automatic gain control module AGC is connected with the input end of the low pass filter module LPF, the output end of the low pass filter module LPF is connected with the input end of the high-speed analog-to-digital conversion module ADC, and the output end of the high-speed analog-to-digital conversion module ADC is connected with the microprocessor unit.
4. The underground space roadway geology detection transceiver tester as claimed in claim 1, wherein said human-computer interaction GUI interface employs a touchable screen, said touchable screen comprising: the device comprises a waveform display module, a mode switching module and a frequency point selection module; the waveform display module is used for displaying data waveforms and data results, the mode switching module is used for switching the transmitting mode and the receiving mode, and the frequency point selection module is used for selecting the frequency of transmitting signals.
5. The underground space roadway geological detection transceiver tester as claimed in claim 2, wherein the DDS signal generator comprises an AD9851 chip.
6. The underground space roadway geological detection transceiver tester as claimed in claim 2, wherein the power amplifier comprises a THS3091 chip and a BUF634 chip, and a plurality of the THS3091 chips and the BUF634 chips are connected in parallel to increase driving energy.
7. The underground space roadway geological detection transceiver tester as claimed in claim 3, wherein the low noise amplifier module LNA comprises an AD8429 chip, and the AD8429 chip is connected with a voltage follower AD 817.
8. The underground space roadway geological detection transceiver tester as claimed in claim 3, wherein the automatic gain control module AGC comprises a VCA810 chip, can be adjusted between-40 dB to 40dB, and has a control voltage of-2V to 0V.
9. The underground space roadway geological detection transceiver tester as claimed in claim 3, wherein the low pass filter module LPF employs an eight-order Butterworth-Bessel filter, comprising two dual-operational amplifier AD8032 chips.
10. The underground space roadway geological exploration transceiver tester as claimed in claim 3, wherein the high-speed analog-to-digital conversion module ADC employs a 65MHz high-speed sampling AD chip, and the microprocessor unit employs a single chip microcomputer or FPGA.
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|---|---|---|---|---|
| CN113726455A (en) * | 2021-09-14 | 2021-11-30 | 中国地质大学（武汉） | Underground space tunnel geological exploration transceiver tester |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113726455A (en) * | 2021-09-14 | 2021-11-30 | 中国地质大学（武汉） | Underground space tunnel geological exploration transceiver tester |
| CN113726455B (en) * | 2021-09-14 | 2024-06-04 | 中国地质大学（武汉） | Underground space roadway geological detection transceiver integrated machine tester |
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