Beidou vehicle terminal host computer external intelligent anti-disassembly device

Abstract

The utility model discloses a kind of intelligent anti-disassembly devices outside Beidou vehicle terminal host, it is related to vehicle positioning terminal anti-disassembly technical field, including monitoring mechanism, control module, power module and response mechanism, monitoring mechanism includes power supply monitoring module, communication monitoring module and external installation monitoring module;Response mechanism includes passage cut-off module, audible and visual alarm module and wireless communication alarm module;The one end of power supply monitoring module, communication monitoring module is connected with terminal host, and the other end of power supply monitoring module, communication monitoring module is connected with control module;External installation monitoring module is installed in the position of terminal host and vehicle connection;Passage cut-off module, audible and visual alarm module, wireless communication alarm module are electrically connected with control module;Power module is electrically connected with monitoring mechanism, control module, response mechanism.The utility model can realize to Beidou vehicle terminal host outside power supply wire, communication line, fixed position all-around monitoring.

Description

Technical Field

[0001] This utility model relates to the field of anti-tampering technology for vehicle-mounted positioning terminals, and in particular to an external intelligent anti-tampering device for a Beidou vehicle-mounted terminal host. Background Technology

[0002] Currently, Beidou vehicle-mounted terminals are widely used in scenarios such as vehicle positioning, trajectory tracking, and remote monitoring, and their normal operation depends on a stable installation. Existing anti-tamper technologies are mostly integrated inside the terminal host, which has the following drawbacks: First, the internal circuitry is highly coupled with the host's functional modules, making it easy to affect the terminal's normal navigation and communication in case of failure; second, external protection is weak, allowing criminals to bypass internal detection by cutting external connection cables or prying open the host's external fixing structure; third, the circuit response speed is slow, failing to trigger protective measures immediately after unauthorized operation. Therefore, there is an urgent need for an external intelligent anti-tamper circuit that is independent of the host's internal system and possesses high-sensitivity detection and rapid response capabilities to address the pain points of existing technologies. Utility Model Content

[0003] This utility model provides an external intelligent anti-tamper device for Beidou vehicle-mounted terminal main unit. Through an innovative architecture of three-line monitoring and dual-mode response, it can achieve all-round monitoring of the external power supply line, communication line and fixed position of Beidou vehicle-mounted terminal main unit. The device is independent of the internal system of the main unit, avoiding mutual interference and improving the reliability of anti-tampering and the stability of terminal operation.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An external intelligent anti-tamper device for a Beidou vehicle-mounted terminal host includes a monitoring mechanism, a control module, a power supply module, and a response mechanism. The monitoring mechanism includes a power supply monitoring module, a communication monitoring module, and an external installation monitoring module. The response mechanism includes a path cut-off module, an audible and visual alarm module, and a wireless communication alarm module. One end of each of the power supply and communication monitoring modules is connected to the Beidou vehicle-mounted terminal host, and the other end is connected to the control module. The power supply monitoring module monitors the power supply status of the Beidou vehicle-mounted terminal host, and the communication monitoring module monitors the communication status of the Beidou vehicle-mounted terminal host. The external installation monitoring module is installed at the location where the Beidou vehicle-mounted terminal host connects to the vehicle and monitors whether there are any abnormalities in the installation location of the Beidou vehicle-mounted terminal host. The path cut-off module, the audible and visual alarm module, and the wireless communication alarm module are electrically connected to the control module. The control module identifies whether the power supply status, communication status, and installation location of the Beidou vehicle-mounted terminal host are abnormal and controls the response mechanism to cut off the path and issue an alarm. The power supply module is electrically connected to the monitoring mechanism, the control module, and the response mechanism to provide power to the entire device.

[0005] Furthermore, the power supply monitoring module includes a current monitoring unit, a voltage monitoring unit, and an impedance monitoring unit; one end of the current monitoring unit, the voltage monitoring unit, and the impedance monitoring unit is electrically connected to the power supply line of the Beidou vehicle-mounted terminal host, and the other end of the current monitoring unit, the voltage monitoring unit, and the impedance monitoring unit is electrically connected to the control module.

[0006] Furthermore, the current monitoring unit includes a current sensor, the input terminals of which are connected to the positive and negative terminals of the power supply line, respectively. A first capacitor and a first resistor are connected in series between the output terminal of the current sensor and the control module. The voltage monitoring unit includes a voltage divider resistor network and an operational amplifier. The voltage divider resistor network includes a second resistor and a third resistor connected in series with the positive terminal of the power supply line. One end of the third resistor is connected to the input terminal of the operational amplifier. A fourth resistor and a second capacitor are connected in series between the output terminal of the operational amplifier and the control module. The impedance monitoring unit includes a signal generator, a third capacitor, a fifth resistor, an impedance monitoring chip, and a sixth resistor. The output terminal of the signal generator, the third capacitor, and the fifth resistor are connected in series to the VN- pin of the impedance monitoring chip. The VN+ pin of the impedance monitoring chip is connected in parallel between the third capacitor and the fifth resistor. The SDA / SCL pin of the impedance monitoring chip and the sixth resistor are connected in series with the control module. The positive terminal of the power supply line is connected between the third capacitor and the fifth resistor.

[0007] Furthermore, the communication monitoring module includes a CAN bus monitoring unit and an antenna feeder monitoring unit; the CAN bus monitoring unit is connected in parallel to the CAN bus of the Beidou vehicle-mounted terminal host, and the antenna feeder monitoring unit is connected in series between the vehicle antenna feeder and the Beidou vehicle-mounted terminal host.

[0008] Furthermore, the CAN bus monitoring unit includes a CAN bus transceiver, the corresponding pins of which are connected to the CAN_H line, CAN_L line of the CAN bus, and the control module, respectively. A seventh resistor and a fourth capacitor are connected in parallel between the CAN_H line and the CAN_L line. The antenna feeder monitoring unit includes a VSWR detection module, which is connected in series between the vehicle antenna feeder and the Beidou vehicle terminal host. The output pin of the VSWR detection module is connected to the control module.

[0009] Furthermore, the external installation monitoring module includes several thin-film pressure sensors and several infrared beam sensors; the thin-film pressure sensors are attached between the Beidou vehicle-mounted terminal host and the vehicle installation position, and each thin-film pressure sensor is electrically connected to the control module; the infrared beam sensors are installed on the vehicle mounting bracket outside the Beidou vehicle-mounted terminal host, and the transmitting end and receiving end of each infrared beam sensor are aligned with the Beidou vehicle-mounted terminal host.

[0010] Furthermore, the wireless communication alarm module includes a Beidou positioning module and a 4G module, both of which are electrically connected to the control module.

[0011] Furthermore, the power supply module includes an on-board power supply and a backup power supply; the on-board power supply is a vehicle power supply, and the on-board power supply is electrically connected to the monitoring mechanism, control module, and response mechanism through a DC / DC converter; the backup power supply is a battery, one end of the backup power supply is connected to the output terminal of the DC / DC converter through a charging management chip, and the other end of the backup power supply is electrically connected to the monitoring mechanism, control module, and response mechanism through a boost chip.

[0012] Furthermore, the path disconnection module includes electromagnetic relays connected in series with the power supply line, CAN bus, and antenna feed line of the Beidou vehicle terminal host, respectively, and the control terminal of each electromagnetic relay is electrically connected to the control module.

[0013] The beneficial effects of this utility model are: 1) This utility model achieves comprehensive monitoring of the external power supply line, communication line and fixed position of the Beidou vehicle terminal host through an innovative architecture of three-line monitoring and dual-mode response. When illegal disassembly is detected, the key path is cut off immediately and an alarm signal is sent. Moreover, the device is independent of the host internal system to avoid mutual interference and improve the reliability of anti-disassembly and the stability of terminal operation.

[0014] 2) The power supply monitoring module monitors the current, voltage, and impedance of the Beidou vehicle-mounted terminal host. It identifies abnormal power-on phenomena of the host by combining characteristics such as sudden current drop, voltage fluctuation, and impedance change, and sends the abnormal digital signals to the control module.

[0015] 3) The communication monitoring module monitors the antenna bus and antenna feeder of the Beidou vehicle-mounted terminal host and identifies communication anomalies.

[0016] 4) The external installation monitoring module identifies and monitors the installation pressure and installation location of the Beidou vehicle-mounted terminal host, and identifies illegal disassembly behavior through a combination of features such as sudden drop in installation pressure and infrared obstruction.

[0017] 5) After the control module identifies illegal disassembly or abnormal behavior, the wireless communication alarm module sends the abnormal situation, location data, and alarm information to the external monitoring platform.

[0018] 6) The power supply module adopts dual power supply to ensure the effective operation of the device. Attached Figure Description

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram illustrating the overall structural operation principle in an embodiment of this utility model. Figure 2 This is a circuit connection diagram of the power supply monitoring module in an embodiment of this utility model; Figure 3 This is a circuit connection diagram of the CAN bus monitoring unit in an embodiment of this utility model; Figure 4 This is a circuit connection diagram of the antenna feeder monitoring unit in an embodiment of this utility model; Figure 5 This is a schematic diagram illustrating the operating principle of the response mechanism in this embodiment of the present invention. Figure 6 This is a circuit connection diagram of the control module in an embodiment of the present invention; Attached image labels: 1-Monitoring mechanism, 2-Control module, 3-Power supply module, 4-Response mechanism, 41-Circuit cutoff module, 42-Audible and visual alarm module, 43-Wireless communication alarm module, 431-BeiDou positioning module, 432-4G module, 31-Vehicle power supply, 32-Backup power supply, 121-CAN bus monitoring unit, 122-Antenna feeder monitoring unit, U1-Current sensor, C1-First capacitor, R1-First resistor, U2-Operational amplifier, R2-Second resistor, R3-Third resistor, R4-Fourth resistor, C2-Second capacitor, U3-Signal generator, C3-Third capacitor, R5-Fifth resistor, U4-Impedance monitoring chip, R6-Sixth resistor, R7-Seventh resistor, C4-Fourth capacitor, U5-DC / DC converter, U6-Charging management chip, U7-Boost chip. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a central component. When a component is described as "connected to" another component, it can be directly connected to the other component or may have a central component. When a component is described as "set on" another component, it can be directly set on the other component or may have a central component. When a component is described as "set in the middle," it is not simply set in the exact center, as long as it is not set within the area defined by both ends being in the middle. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Reference Figures 1 to 6As shown, an external intelligent anti-tamper device for a Beidou vehicle-mounted terminal host includes a monitoring mechanism 1, a control module 2, a power supply module 3, and a response mechanism 4. The monitoring mechanism 1 includes a power supply monitoring module, a communication monitoring module, and an external installation monitoring module. The response mechanism 4 includes a circuit cut-off module 41, an audible and visual alarm module 42, and a wireless communication alarm module 43. One end of the power supply monitoring module and the communication monitoring module is connected to the Beidou vehicle-mounted terminal host, and the other end of the power supply monitoring module and the communication monitoring module is connected to the control module 3. The power supply monitoring module is used to monitor the power supply status of the Beidou vehicle-mounted terminal host, and the other end of the communication monitoring module is connected to the control module 3. The module is used to monitor the communication status of the Beidou vehicle-mounted terminal host; the external installation monitoring module is installed at the location where the Beidou vehicle-mounted terminal host is connected to the vehicle, and is used to monitor whether there is any abnormality in the installation location of the Beidou vehicle-mounted terminal host; the path cutting-off module 41, the audible and visual alarm module 42, and the wireless communication alarm module 43 are electrically connected to the control module 2, and the control module 2 is used to identify whether the power supply status, communication status, and installation location of the Beidou vehicle-mounted terminal host are abnormal in order to control the response mechanism 4 to cut off the path and issue an alarm; the power supply module 3 is electrically connected to the monitoring mechanism 1, the control module 2, and the response mechanism 4, and is used to provide power to the entire device. This invention adopts a three-layer architecture of "monitoring layer - control layer - response layer". The monitoring layer consists of a power supply monitoring module, a communication monitoring module, and an external installation monitoring module, which realizes three-line monitoring of circuit, communication, and external installation location. The control layer consists of a control module 2 to complete signal analysis and command issuance. The response layer consists of an audible and visual alarm module 42 and a wireless communication alarm module 43 to realize dual-mode triggering to perform protection and alarm actions. Through the innovative architecture of three-line monitoring and dual-mode response, it realizes all-round monitoring of the external power supply line, communication line, and fixed location of the Beidou vehicle terminal host, and realizes multi-dimensional illegal operation detection. When illegal disassembly is detected, the key path is cut off immediately and an alarm signal is sent. Moreover, the device is independent of the host internal system to avoid mutual interference and improve the reliability of anti-tampering and the stability of terminal operation.

[0024] The power supply monitoring module includes a current monitoring unit, a voltage monitoring unit, and an impedance monitoring unit; one end of the current monitoring unit, the voltage monitoring unit, and the impedance monitoring unit is electrically connected to the power supply line of the Beidou vehicle-mounted terminal host, and the other end of the current monitoring unit, the voltage monitoring unit, and the impedance monitoring unit is electrically connected to the control module 2.

[0025] Specifically, such as Figure 2As shown, the current monitoring unit includes a current sensor U1. The input terminals 1P+ and 1P- of the current sensor U1 are connected to the positive and negative terminals of the power supply line 5, respectively. A first capacitor C1 and a first resistor R1 are connected in series between the output terminal of the current sensor U1 and the control module 2. The current sensor U1 is connected in series in the positive power supply line. The VCC pin is connected to 5V, the GND pin is grounded, and the OUT pin outputs a 0-5V electrical signal. After being filtered by the first capacitor C1 (0.1μF), the signal is connected to the ADC1 pin (PA0) of the control layer. The first resistor R1 (10kΩ) is a pull-up resistor to ensure signal stability. The current sensor U1 (model ACS712, range ±5A, accuracy ±1.5%FS) collects the power supply line current in real time (normal operating current 0.5-2A). When the current drops by more than 80% (e.g., the power supply line is cut) or rises by more than 50% (e.g., short circuit damage), it outputs a voltage signal (0-5V corresponds to 0-5A) to the control layer. The response time is <100μs.

[0026] The voltage monitoring unit includes a voltage divider resistor network and an operational amplifier U2. The voltage divider resistor network includes a second resistor R2 and a third resistor R3 connected in series at the positive terminal of the power supply line 5. One end of the third resistor R3 is connected to the input terminal of the operational amplifier U2. A fourth resistor R4 and a second capacitor C2 are connected in series between the output terminal of the operational amplifier U2 and the control module 2. After the voltage of the positive terminal of the power supply line is stepped down by the second resistor R2 and the third resistor R3, it is connected to the non-inverting input terminal of the operational amplifier U2. The second resistor R2 (100kΩ) and the third resistor R3 (10kΩ) together form a voltage divider resistor network, which, together with the operational amplifier U2 (model LM358), forms a voltage sampling circuit, which feeds back to the fourth resistor R4 (10kΩ) and outputs an electrical signal of 0-3.3V to the control module 2. The second capacitor C2 (1μF) is a filter capacitor to suppress voltage fluctuations. When the voltage is <9V (12V system) and lasts for >1s, it is determined to be a power supply abnormality.

[0027] The impedance monitoring unit includes a signal generator U3, a third capacitor C3, a fifth resistor R5, an impedance monitoring chip U4, and a sixth resistor R6. The output terminal of the signal generator U3, the third capacitor C3, and the fifth resistor R5 are connected in series to the VN- pin of the impedance monitoring chip U4, and the VN+ pin of the impedance monitoring chip U4 is connected in parallel between the third capacitor C3 and the fifth resistor R5. The SDA / SCL pin of the impedance monitoring chip U4 and the sixth resistor R6 are connected in series to the control module 2. The positive terminal of the power supply line is connected between the third capacitor C3 and the fifth resistor R5. The impedance monitoring unit uses a high-frequency signal injection method. The signal generator U3 injects a 1MHz sine wave signal into the power supply line through the third capacitor C3 (1nF). The impedance detection chip U4 (model AD5933, measurement range 10Ω-10MΩ) collects the power supply line impedance signal through the fifth resistor R5 (1kΩ). It communicates with the control module 2 via the I2C bus (SDA, SCL pins). The sixth resistor R6 (4.7kΩ) is a pull-up resistor to ensure stable I2C communication. Under normal circumstances, the impedance is stable (approximately 6-12Ω for 12V system and approximately 12-24Ω for 24V system). When the impedance changes by more than 30% (such as infinite impedance after the line is cut, or a sudden drop in impedance caused by the introduction of foreign objects), an abnormal signal is immediately triggered.

[0028] The communication monitoring module 12 includes a CAN bus monitoring unit 121 and an antenna feeder monitoring unit 122; the CAN bus monitoring unit is connected in parallel on the CAN bus of the Beidou vehicle terminal host, and the antenna feeder monitoring unit 122 is connected in series between the vehicle antenna feeder and the Beidou vehicle terminal host. Specifically, the CAN bus monitoring unit 121 includes a CAN bus transceiver. The corresponding pins of the CAN bus transceiver are connected to the CAN_H line, CAN_L line of the CAN bus, and the control module, respectively. A seventh resistor R7 and a fourth capacitor C4 are connected in parallel between the CAN_H line and the CAN_L line. The output pin of the CAN bus transceiver is connected to the control module 2. The CAN bus transceiver (model TJA1050) monitors the bus level (normally CAN_H is 2.5-3.5V, CAN_L is 1.5-2.5V) and the message transmission rate (normally 500kbps) in real time. When the bus level is detected to be continuously >4V or <0.5V (such as a short circuit) or the message loss rate is >10% (such as a broken line), an interrupt signal is output to the control module 2. The antenna feeder monitoring unit 122 includes a standing wave ratio (SWR) detection module. The SWR detection module is connected in series between the vehicle antenna feeder and the Beidou vehicle-mounted terminal host. The output pin of the SWR detection module is connected to the control module 2. The antenna feeder (SMA interface) and the host are connected in series with the SWR detection module (model AD8302, measurement range 0.1-10, accuracy ±0.1) to monitor the feeder SWR in real time (normally <1.5). When the SWR is >3 (e.g., the feeder is cut or the connector is loose), the module outputs a voltage signal (0-5V corresponds to 0.1-10) to the control module 2. The detection period is <100ms.

[0029] The external installation monitoring module includes several thin-film pressure sensors and several infrared beam sensors. The thin-film pressure sensors are attached between the Beidou vehicle-mounted terminal host and the vehicle mounting location. Each thin-film pressure sensor is electrically connected to the control module 2. The infrared beam sensors are mounted on the vehicle mounting bracket outside the Beidou vehicle-mounted terminal host, with the transmitter and receiver of each infrared beam sensor aligned with the Beidou vehicle-mounted terminal host. The thin-film pressure sensors are model FSR406, with a range of 0-100 kPa and an accuracy of ±2% FS. They are attached to the four corners where the Beidou vehicle-mounted terminal host contacts the vehicle mounting bracket. Each thin-film pressure sensor corresponds to a signal conditioning circuit (composed of an RC filter circuit and a voltage follower). Under normal installation conditions, the pressure is 2-5 kPa. When the pressure drops sharply by more than 60% (e.g., the host is detached due to prying the bracket), an abnormal signal is output. The infrared beam sensor model is E3Z-LS63, with a detection distance of 5-30cm and a response time of <1ms. It is installed in pairs around the main unit on an external mounting bracket, with a total of four sets forming a rectangular monitoring area. The transmitter and receiver are aligned and aimed at the Beidou vehicle terminal. Under normal circumstances, the receiver continuously receives the infrared signal (outputting a high level of 3.3V). If a hand or tool obstructs the signal (such as when a screw is being removed), causing an interruption of >500ms, the receiver outputs a low level, triggering an anomaly detection.

[0030] The wireless communication alarm module 43 includes a Beidou positioning module 431 and a 4G module 432, both of which are electrically connected to the control module 2. The wireless communication alarm module 43 also enables communication between the control module 2 and an external monitoring platform. The Beidou positioning module 431, model BDS-610, supports the BDS / B1I frequency band and has a communication rate of 1200bps. When unauthorized disassembly is detected, the control module 2 issues an instruction to send an alarm message to the monitoring platform through the Beidou positioning module 431. This message includes data such as the vehicle's Beidou positioning coordinates (accuracy ≤10m), the type of unauthorized operation (identified by the externally installed monitoring module), and the circuit status (identified by the power supply monitoring module) (message length ≤140 bytes), ensuring that an alarm can still be triggered even without a 4G signal. The 4G module 432, model EC20, supports full network connectivity. When unauthorized disassembly is detected, the control module 2 issues an instruction to send an alarm push notification to the external monitoring platform and the vehicle owner's mobile APP through the 4G module 432 using the HTTPS protocol, with a response time of <3s.

[0031] Please refer to Figure 6As shown, the power supply module 3 includes an on-board power supply 31 and a backup power supply 32. The on-board power supply 31 is the vehicle's power source, and it is electrically connected to the monitoring mechanism 1, control module 2, and response mechanism 4 via a DC / DC converter U5. The backup power supply 32 is a battery. One end of the backup power supply 32 is connected to the output of the DC / DC converter U5 via a charging management chip U6, and the other end is electrically connected to the monitoring mechanism 1, control module 2, and response mechanism 3 via a boost chip U7. The DC / DC converter U5 is model XL1509, with an input of 9-36V and an output of 5V / 2A. It converts the vehicle's 12V / 24V power supply to 5V to power the circuitry of the entire anti-tamper device, and simultaneously charges the backup battery via the charging management chip U6 (model TP4056). The backup power supply 3 uses a lithium polymer battery (capacity 1500mAh, voltage 3.7V) and is equipped with a battery protection board (supporting overcharge, over-discharge, and short circuit protection). When the vehicle power supply 31 is cut off (such as when the power supply line is cut), the backup battery 32 automatically switches to power supply through the boost chip U7 (model SX1308, output 5V / 1A) to ensure that the circuit continues to work for ≥8 hours (≥4 hours in alarm state). When the battery power is lower than 20%, a low power warning is sent to the monitoring platform through the control module 2.

[0032] The path disconnection module 41 includes electromagnetic relays connected in series on the power supply line, CAN bus, and antenna feed line of the Beidou vehicle-mounted terminal host. The control terminal of each electromagnetic relay is electrically connected to the control module 2. The electromagnetic relay coil is controlled by a PWM signal from the control module 2. When a "disconnection command" is received, the coil is energized, the contacts open, and the connection between the Beidou vehicle-mounted terminal host and the external power supply and communication is disconnected. The electromagnetic relay has a power-off retention function; the coil remains open even after power is cut off. Only after an authorization password is sent from an external monitoring platform to the control module 2 will the control module 2 send a corresponding PWM signal to the electromagnetic relay to reset it. This protection mode prevents the Beidou vehicle-mounted terminal host from being disassembled and used without authorization. Restoration requires platform confirmation, rendering unauthorized disassembly and replacement invalid.

[0033] The control module 2 includes a microcontroller, which is an STM32L476 microcontroller with a built-in 4MB Flash memory. The microcontroller receives digital signals output from each unit of the monitoring mechanism and processes the electrical signal data through methods such as moving average filtering, threshold comparison, and feature recognition. It determines that the power supply line has been cut by using the combined features of "sudden drop in current, voltage fluctuation, and impedance change" and determines that the bracket has been pried by using the combined features of "sudden drop in installation pressure and infrared obstruction". The overall judgment of illegal disassembly behavior has a false judgment rate of ≤0.01 times / thousand hours. When illegal disassembly is judged, two commands are immediately sent to the response mechanism: one is a "cut-off command" to the path cut-off module, and the other is an "alarm command" to the audible and visual alarm module 42 and the wireless communication alarm module 43. At the same time, an "engine lock request" is sent to the vehicle ECU through the CAN bus, and a "status freeze command" is sent to the Beidou terminal host through the UART interface (freezing the uploaded positioning data to prevent tampering). Built-in Flash memory is used to record information such as the time of illegal operation (accurate to milliseconds), trigger unit (such as "power line, infrared blockage"), and voltage / current / impedance values ​​at that time. The stored data is retained for ≥1 year and can be exported via USB interface.

[0034] The audible and visual alarm module 42 includes a miniature buzzer and a red LED light, both of which are installed in a conspicuous position on the outside of the device. When an alarm is triggered, the buzzer sounds continuously and the LED light flashes.

[0035] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. An external intelligent anti-tamper device for a Beidou vehicle-mounted terminal host, characterized in that, The device includes a monitoring mechanism, a control module, a power supply module, and a response mechanism. The monitoring mechanism comprises a power supply monitoring module, a communication monitoring module, and an external installation monitoring module. The response mechanism includes a path cutoff module, an audible and visual alarm module, and a wireless communication alarm module. One end of each of the power supply and communication monitoring modules is connected to the BeiDou vehicle-mounted terminal host, and the other end is connected to the control module. The power supply monitoring module monitors the power supply status of the BeiDou vehicle-mounted terminal host, and the communication monitoring module monitors its communication status. The external installation monitoring module is installed at the location where the BeiDou vehicle-mounted terminal host connects to the vehicle and monitors whether there are any abnormalities in the installation location. The path cutoff module, audible and visual alarm module, and wireless communication alarm module are electrically connected to the control module. The control module identifies any abnormalities in the power supply, communication status, and installation location of the BeiDou vehicle-mounted terminal host to control the response mechanism to cut off the path and issue an alarm. The power supply module is electrically connected to the monitoring mechanism, control module, and response mechanism to provide power to the entire device.

2. The intelligent anti-tamper device for the external exterior of a Beidou vehicle-mounted terminal host according to claim 1, characterized in that, The power supply monitoring module includes a current monitoring unit, a voltage monitoring unit, and an impedance monitoring unit; one end of the current monitoring unit, the voltage monitoring unit, and the impedance monitoring unit is electrically connected to the power supply line of the Beidou vehicle-mounted terminal host, and the other end of the current monitoring unit, the voltage monitoring unit, and the impedance monitoring unit is electrically connected to the control module.

3. The intelligent anti-tamper device for the external exterior of a Beidou vehicle-mounted terminal host according to claim 2, characterized in that, The current monitoring unit includes a current sensor, the input terminals of which are connected to the positive and negative terminals of the power supply line, respectively. A first capacitor and a first resistor are connected in series between the output terminal of the current sensor and the control module. The voltage monitoring unit includes a voltage divider resistor network and an operational amplifier. The voltage divider resistor network includes a second resistor and a third resistor connected in series with the positive terminal of the power supply line. One end of the third resistor is connected to the input terminal of the operational amplifier. A fourth resistor and a second capacitor are connected in series between the output terminal of the operational amplifier and the control module. The impedance monitoring unit includes a signal generator, a third capacitor, a fifth resistor, an impedance monitoring chip, and a sixth resistor. The output terminal of the signal generator, the third capacitor, and the fifth resistor are connected in series to the VN- pin of the impedance monitoring chip. The VN+ pin of the impedance monitoring chip is connected in parallel between the third capacitor and the fifth resistor. The SDA / SCL pin of the impedance monitoring chip and the sixth resistor are connected in series with the control module. The positive terminal of the power supply line is connected between the third capacitor and the fifth resistor.

4. The intelligent anti-tamper device for the external exterior of a Beidou vehicle-mounted terminal host according to claim 1, characterized in that, The communication monitoring module includes a CAN bus monitoring unit and an antenna feeder monitoring unit; the CAN bus monitoring unit is connected in parallel on the CAN bus of the Beidou vehicle terminal host, and the antenna feeder monitoring unit is connected in series between the vehicle antenna feeder and the Beidou vehicle terminal host.

5. The Beidou vehicle-mounted terminal host external intelligent anti-tamper device according to claim 4, characterized in that, The CAN bus monitoring unit includes a CAN bus transceiver, whose corresponding pins are connected to the CAN_H line, CAN_L line, and the control module of the CAN bus, respectively. A seventh resistor and a fourth capacitor are connected in parallel between the CAN_H line and the CAN_L line. The antenna feeder monitoring unit includes a VSWR detection module, which is connected in series between the vehicle antenna feeder and the Beidou vehicle terminal host. The output pin of the VSWR detection module is connected to the control module.

6. The intelligent anti-tamper device for the external exterior of a Beidou vehicle-mounted terminal host according to claim 1, characterized in that, The external installation monitoring module includes several thin-film pressure sensors and several infrared beam sensors; the thin-film pressure sensors are attached between the Beidou vehicle-mounted terminal host and the vehicle installation position, and each thin-film pressure sensor is electrically connected to the control module. The infrared beam sensors are installed on the vehicle mounting bracket outside the Beidou vehicle-mounted terminal host, and the transmitting end and receiving end of each infrared beam sensor are aligned with the Beidou vehicle-mounted terminal host.

7. The intelligent anti-tamper device for the external exterior of a Beidou vehicle-mounted terminal host according to claim 1, characterized in that, The wireless communication alarm module includes a Beidou positioning module and a 4G module, both of which are electrically connected to the control module.

8. The Beidou vehicle-mounted terminal host external intelligent anti-tamper device according to claim 1, characterized in that, The power supply module includes an on-board power supply and a backup power supply; the on-board power supply is a vehicle power supply, which is electrically connected to the monitoring mechanism, control module, and response mechanism through a DC / DC converter; the backup power supply is a battery, one end of which is connected to the output terminal of the DC / DC converter through a charging management chip, and the other end of which is electrically connected to the monitoring mechanism, control module, and response mechanism through a boost chip.

9. The intelligent anti-tamper device for the external exterior of a Beidou vehicle-mounted terminal host according to claim 1, characterized in that, The path cutoff module includes electromagnetic relays connected in series with the power supply line, CAN bus, and antenna feed line of the Beidou vehicle terminal host, respectively, and the control terminal of each electromagnetic relay is electrically connected to the control module.

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