A portable long-distance line-patrolling signal receiving device

Abstract

The utility model provides a portable long -distance line signal receiving device belongs to communication engineering technical field. It includes the casing, is provided with filter circuit, detection circuit, logarithm operation amplifier circuit, operational amplifier circuit, main control processing circuit, display drive circuit and display screen in the casing, the front end of filter circuit is connected with the radio frequency input mouth of installing on the casing through the combiner, filter circuit is connected with detection circuit through logarithm operation amplifier circuit, the other end of detection circuit is connected with the front end of main control processing circuit through operational amplifier circuit, and display screen is connected with main control processing circuit through display drive circuit. The utility model can carry out the calibration to the drift phenomenon produced in the use process, is convenient to the equipment function expansion and the change of bottom program later. Add filter measure at the power supply, increase laboratory electromagnetic anti -interference measure.

Description

Technical Field

[0001] This utility model relates to radio frequency microwave technology and electronic measurement technology in the field of communication engineering, specifically a portable long-distance line inspection signal receiving device. Background Technology

[0002] With the continuous advancement of electronic technology, the integration of equipment is becoming increasingly sophisticated, and electromagnetic environments are becoming more complex. To ensure the stable operation of military equipment in complex electromagnetic environments, electromagnetic compatibility (EMC) testing is becoming more frequent and demanding. Therefore, both the accuracy and efficiency of EMC testing need to be improved simultaneously.

[0003] During testing missions, the electromagnetic compatibility (EMC) laboratory frequently employs the Army's seven-item test, requiring testers to continuously set up the test environment. This involves the system debugging of nearly a hundred major instruments, including EMI receivers, signal generators, power meters, electromagnetic field strength meters, switching devices, power amplifiers, and monitoring probes. Additionally, there are dozens of interconnecting cables with N / SMA / K connectors, and the system includes dozens of accessories such as signal injection current probes, attenuators, couplers, preamplifiers, and LISNs. Instruments, accessories, and cables are distributed between anechoic chambers, control rooms, and conduction rooms, with filters, splitters, and other accessories located underground. Before testing, system setup requires testers to ensure accurate matching and reasonable loss of all interconnecting cables. Misjudgments can lead to system malfunctions and inaccurate test results. More seriously, highly sensitive receivers, preamplifiers, and filters are particularly susceptible to damage from large signals or DC current. Therefore, preparation and troubleshooting during the testing process are crucial.

[0004] In view of this, there is an urgent need to develop a portable, highly sensitive small signal interconnect cable monitoring device to improve the identification efficiency of signal lines in laboratory systems, while ensuring voltage monitoring capabilities, achieving the effect of multiple uses in one device, effectively improving the efficiency of troubleshooting system problems, avoiding misjudgment of test results, improving testing efficiency, and saving human resources. Utility Model Content

[0005] In view of this, this utility model provides a portable long-distance line-following signal receiving device, which can calibrate the drift phenomenon that occurs during use, facilitating future expansion of device functions and modification of the underlying program. Filtering measures are added at the power supply to enhance electromagnetic interference protection in the laboratory.

[0006] The present invention achieves the above-mentioned technical effects by adopting the following technical solution:

[0007] A portable long-distance line-following signal receiving device includes a housing, and the housing is provided with a filter circuit, a detector circuit, a logarithmic operational amplifier circuit, an operational amplifier circuit, a main control processing circuit, a display driver circuit, and a display screen.

[0008] The front end of the filtering circuit is connected to the radio frequency input port installed on the housing through a combiner to collect the incoming signal and perform filtering processing on the signal;

[0009] The filtering circuit is connected to the detection circuit through a logarithmic amplification circuit. The filtered signal is amplified logarithmically and then processed by the detection circuit.

[0010] The other end of the detector circuit is connected to the front end of the main control processing circuit through an operational amplifier circuit. The operational amplifier circuit amplifies the signal processed by the detector circuit, which is then processed by the main control processing circuit.

[0011] The display screen is connected to the main control processing circuit through a display driver circuit, and the display screen displays the signal strength.

[0012] Furthermore, the detection circuit includes an SMA interface and an interface filter circuit, a DC 5V power supply regulator circuit, a frequency dynamic range selection circuit, and a linear DC output circuit.

[0013] The input of the interface filter circuit is connected to the SMA interface, and the output is connected to the signal input of the logarithmic operational amplifier circuit; the input of the 5V DC power supply regulator circuit is connected to the output port of the linear DC output circuit, and the output is connected to the VCC terminal of the detector circuit; the output of the frequency dynamic range selection circuit is connected to the linear DC output circuit, and the linear DC output circuit is connected to the RF port of the operational amplifier circuit.

[0014] Furthermore, the main control processing circuit includes an STM32MCU mother chip, a crystal oscillator circuit, an indicator circuit, a clock synchronization circuit, a program loading input port, an information output interface, a backlight display adjustment circuit, a calibration circuit, a reset circuit, and a drive circuit.

[0015] The crystal oscillator circuit is connected to the OSC32 pin of the STM32 MCU mother chip. The input terminal of the indicator circuit is connected to the 3.3V regulated output terminal, and the output terminal is connected to the WAKEUP pin of the mother chip. The clock synchronization circuit is connected to the RTC interface of the STM32 MCU mother chip. The backlight adjustment circuit is connected to PB9 of the STM32 MCU mother chip. The information output interface is connected to the display screen. The calibration circuit is connected to the PB8 pin of the STM32 MCU mother chip. The reset circuit is connected to the NRST interface of the STM32 MCU mother chip. The drive circuit is connected to ADIN1 of the STM32 MCU mother chip.

[0016] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0017] 1. The radio frequency signal receiving subsystem of this utility model can receive sine wave and square wave signals emitted by the signal source. Since it adopts two signal input demultiplexers with backup, the signals are input to the signal detection port through the demultiplexers, and two cables can be tested simultaneously.

[0018] 2. This utility model has good electromagnetic compatibility and can resist interference from the external electromagnetic environment, such as static electricity and electromagnetic pulse interference of various frequency bands. It has very low electromagnetic radiation, and the amount of electromagnetic radiation generated during operation is low, which meets the requirements of electromagnetic purity of the environment.

[0019] 3. This utility model is centered on testers and is committed to providing a highly convenient experience, freeing testers from complicated operation steps. One-click operation maximizes the simplicity of the design, and the high degree of convenience can make testing more efficient.

[0020] 4. This utility model adopts key circuits such as AD8307 detector and operational amplifier, driver, MCU processing, and display unit, with integrated design, high reliability, and stable and accurate numerical reading.

[0021] 5. This utility model is small in size and light in weight, easy to carry and can be easily put into a toolbox, which greatly improves the flexibility of work, whether in field testing or outdoor work.

[0022] 6. This utility model is space-saving and can be used for testing in confined spaces, solving the problem of traditional instruments being too bulky and difficult to use. Attached Figure Description

[0023] Figure 1 This is a block diagram showing the overall composition of this utility model.

[0024] Figure 2 This is a flowchart of the main control processing circuit of the device as a whole.

[0025] Figure 3 This is the detection circuit diagram of this utility model.

[0026] Figure 4 This is a diagram of the MCU chip in the main control processing circuit of this utility model.

[0027] Figure 5 This refers to the calibration circuit, reset circuit, and backlight display adjustment circuit in the main control processing of this utility model.

[0028] Figure 6 : This is a structural schematic diagram of the present invention.

[0029] Figure 7 :yes Figure 6 A side view;

[0030] Figure 8 :yes Figure 6 Axonometric drawing.

[0031] In the diagram: 9. RF input port, 10. RF combiner / splitter, 11. Embedded card slot connector, 12. Voltage display screen, 13. Radiation-proof glass window, 14. Network interface display unit, 15. High-definition display module, 16. Filtering module, 1. Charging port, 3. Processing core unit detection and main control, 2. Waveguide ventilation window, 4. Power supply and charging power supply, 5. DC detection module, 6. Main switch, 7. DC detection input port, 8. RJ-45 network detection port. Detailed Implementation

[0032] The present invention will now be further described with reference to the accompanying drawings.

[0033] To facilitate the understanding of the technical solution of this patent by those skilled in the art, and to make the technical purpose, technical solution and beneficial effects of this patent clearer, and to fully support the scope of protection of the claims, the technical solution of this patent will be further and more detailed below in the form of specific cases.

[0034] Reference Figures 1 to 8 This embodiment of a portable long-distance line-following signal receiving device comprises an AD8037 detector circuit, an STM32 MCU main control processing circuit, a reset and calibration subsystem, a power supply system, a network level receiving module, a DC detection module, a housing, a drive circuit, and a signal display module. It calibrates for drift phenomena occurring during use, facilitating future expansion of device functionality and modifications to the underlying program. Filtering measures are added to the power supply to enhance electromagnetic interference protection.

[0035] The detection circuit includes an SMA interface and an interface filter circuit, a 5V DC power supply regulator circuit, a frequency dynamic range selection circuit, and a linear DC output circuit. The input of the interface filter circuit is connected to the SMA interface, and its output is connected to the signal input of the logarithmic operational amplifier circuit. The input of the 5V DC power supply regulator circuit is connected to the output port of the linear DC output circuit, and its output is connected to the VCC terminal of the detection circuit. The output of the frequency dynamic range selection circuit is connected to the linear DC output circuit, and the linear DC output circuit is connected to the RF port of the operational amplifier circuit.

[0036] The STM32MCU main control processing unit includes an STM32MCU mother chip, a crystal oscillator circuit, an indicator circuit, a clock synchronization circuit, a program input port, an information output interface, a backlight display adjustment circuit, a calibration circuit, a reset circuit, a driver circuit, and a spare interface. The crystal oscillator circuit is connected to the OSC32 pin of the STM32MCU mother chip. The input of the indicator circuit is connected to the 3.3V regulated output, and its output is connected to the WAKEUP pin of the mother chip. The clock synchronization circuit is connected to the RTC interface of the STM32MCU mother chip. The backlight adjustment circuit is connected to PB9 of the STM32MCU mother chip. The information output interface is connected to the display screen. The calibration circuit is connected to PB8 of the STM32MCU mother chip. The reset circuit is connected to the NRST interface of the STM32MCU mother chip. The driver circuit is connected to the power supply module and also to the ADIN1 pin of the STM32MCU mother chip.

[0037] The reset calibration subsystem includes a reset circuit and a calibration compensation program.

[0038] The STM32 MCU main control processing circuit is equipped with software, which includes initialization of various interfaces and peripherals, clock configuration, calibration subroutines, system programs, feedback functions, etc.

[0039] The power supply system includes a lithium battery body, a power supply filter component, an anti-interference magnetic ring, a charging interface, and an overcurrent protection fuse terminal.

[0040] The network level module includes an RJ-45 network generator module, an RJ-45 network receiver module, a voltage regulator module, and an indicator light group.

[0041] The DC detection module includes a DC detection and adjustment module, a power interface, and a display module.

[0042] The product housing includes an aluminum alloy body, a front cover, a rear cover, ventilation holes, a network interface opening, a DC monitoring opening, a dual N coaxial cable interface opening, a radio frequency signal receiving display window, electromagnetic shielding glass, an electromagnetic shielding wire mesh crimping strip, a DC voltage display window, a base shock-absorbing block, a side handle mounting block, a main switch hole, a charging hole, and a charging waterproof sleeve.

[0043] The display module includes a main display screen, a display driving circuit, a display filtering module, an anti-interference magnetic ring, a display fixing clamp, a DuPont data cable, and various cable pins.

[0044] A portable long-distance line-following signal receiving device has a calibration function. After the circuit board was manufactured, it was found during debugging that the output accuracy deviation of some frequency points was greater than 0.5dB. The calibration circuit design was reserved at the beginning of the project. At this stage, compensation is used for accuracy calibration. A calibration subroutine is set up so that the final output meets the requirements.

[0045] A portable long-distance line-following signal receiving device, the software circuit block diagram is as follows: Figure 1 As shown,

[0046] A portable long-distance line inspection signal receiving device has a charging port on its side panel. The charging port is fitted with a rubber bushing and is designed to be waterproof and shockproof.

[0047] A portable long-distance line inspection signal receiving device has a rechargeable battery connected to a base plate using fastening bolts, and rubber pads are added to increase its shock resistance.

[0048] A portable long-distance line inspection signal receiving device includes network level reception functionality. The front panel features an RJ-45 network port for direct plug-in use, and an LED array on the top panel displays connection status. This facilitates simultaneous measurement of various interconnecting cables and monitoring of network conditions.

[0049] A portable long-distance line inspection signal receiving device has a DC monitoring voltage input terminal, banana plug quick-connect terminals, and an aluminum alloy housing. It features precision milling cutters for a coaxial N-interface, a universal fiber optic interface, an RJ-45 network interface, a DC cable input interface, a switch port, a charging port, and heat dissipation holes.

[0050] Specifically

[0051] like Figure 3 The module shown implements the input amplitude and strength detection of radio frequency signals. The logarithmic operational amplifier AD8307 receives the signal and converts it into a linear voltage output. The AD8307 operates within a range of -75 to 17 dBm, and its output accuracy is 25 mV / dB. A high-impedance operational amplifier circuit is added to appropriately amplify the signal to ensure receiver sensitivity.

[0052] This microcontroller system is as follows Figure 4 The circuit operates at 3.3V, uses an external 8MHz crystal oscillator, supports 12-bit ADC sampling, and has a minimum resolution of 3.3 / 1024 = 3.2mV, corresponding to an input signal amplitude resolution of 3.2 / 25 = 0.128dB, which meets the accuracy requirements.

[0053] This circuit adds a calibration function, such as... Figure 6 As shown, switch S3 is the calibration button. Press and hold this button for 2 seconds to enter calibration mode. Then, input a 0dB RF signal of the specified frequency through the RF1 interface to complete the calibration at that frequency. Because this circuit supports full-band amplitude testing from 10MHz to 500MHz, users need to calibrate the test frequency band with a dedicated instrument before each use to ensure test accuracy. The test accuracy after calibration can be guaranteed to be within 0.5dBm.

[0054] To ensure output accuracy, the software employs techniques such as calibration, computational processing, and compensation processing, for example... Figure 2 As shown, the process includes starting the ADC calibration, starting the timer TIM2 channel+ for PWM output, processing various acquired data for conversion and recording, calibrating the compensation value and outputting an accurate value, initializing the LCD via SPI, and outputting display information.

[0055] For the purpose of simplifying the description, the disclosure of technical details in the above-described specific embodiments may only reach the level that a person skilled in the art can determine for themselves. That is, for the technical details not disclosed in the above-described specific embodiments, a person skilled in the art can complete them without any creative effort, with the full guidance of the patented technical solution and with the help of published documents such as textbooks, reference books, papers, patents, and audio-visual products. Alternatively, these details are content that a person skilled in the art can determine for themselves based on the actual situation, according to their common understanding. Therefore, even if these technical details are not disclosed, it will not affect the sufficiency of disclosure of the patented technical solution.

[0056] In summary, based on the interpretative role of the claims in this patent specification, any specific implementation that falls within the scope of the claims of this patent is within the protection scope of this patent.

Claims

1. A portable long-range line-patrol signal receiving device comprising a housing, characterized in that, The housing contains a filter circuit, a detector circuit, a logarithmic operational amplifier circuit, an operational amplifier circuit, a main control processing circuit, a display driver circuit, and a display screen. The front end of the filtering circuit is connected to the radio frequency input port installed on the housing through a combiner to collect the incoming signal and perform filtering processing on the signal; The filtering circuit is connected to the detection circuit through a logarithmic amplification circuit. The filtered signal is amplified logarithmically and then processed by the detection circuit. The other end of the detector circuit is connected to the front end of the main control processing circuit through an operational amplifier circuit. The operational amplifier circuit amplifies the signal processed by the detector circuit, which is then processed by the main control processing circuit. The display screen is connected to the main control processing circuit through a display driver circuit, and the display screen displays the signal strength.

2. A portable long distance line-patrolling signal receiving device according to claim 1, wherein The detection circuit includes an SMA interface and an interface filter circuit, a DC 5V power supply regulator circuit, a frequency dynamic range selection circuit, and a linear DC output circuit. The input of the interface filter circuit is connected to the SMA interface, and the output is connected to the signal input of the logarithmic operational amplifier circuit; the input of the 5V DC power supply regulator circuit is connected to the output port of the linear DC output circuit, and the output is connected to the VCC terminal of the detector circuit. The output of the frequency dynamic range selection circuit is connected to the linear DC output circuit, and the linear DC output circuit is connected to the RF port of the operational amplifier circuit.

3. The portable long-range line-patrol signal receiving apparatus according to claim 1, wherein The main control processing circuit includes an STM32MCU mother chip, a crystal oscillator circuit, an indicator circuit, a clock synchronization circuit, a program loading input port, an information output interface, a backlight display adjustment circuit, a calibration circuit, a reset circuit, and a drive circuit. The crystal oscillator circuit is connected to the OSC32 pin of the STM32 MCU mother chip. The input terminal of the indicator circuit is connected to the 3.3V regulated output terminal, and the output terminal is connected to the WAKEUP pin of the mother chip. The clock synchronization circuit is connected to the RTC interface of the STM32 MCU mother chip. The backlight adjustment circuit is connected to PB9 of the STM32 MCU mother chip. The information output interface is connected to the display screen. The calibration circuit is connected to the PB8 pin of the STM32 MCU mother chip. The reset circuit is connected to the NRST interface of the STM32 MCU mother chip. The drive circuit is connected to ADIN1 of the STM32 MCU mother chip.

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