Intelligent detection method for built-in antenna of on-board internet of things terminal

Abstract

An intelligent detection method for a built-in antenna of an on-board Internet of Things terminal. A detection instruction unit sends a detection command to a VP, and the VP sends a corresponding command to an AP; the AP controls a port RF0 of an antenna tuning switch Switch to be separately connected to ports RF1, RF2, RF3 and RF4; the detection instruction unit respectively acquires voltage values when paths of the ports RF1, RF2, RF3 and RF4 are ON and reports same to the VP; the VP compares the received voltage values with an internal preset threshold, respectively determines antenna states when sub-paths of the ports RF1, RF2, RF3 and RF4 are ON, and stores the antenna states; and the VP performs built-in determination on the antenna states when the sub-paths of the ports RF1, RF2, RF3 and RF4 are ON, and returns a final detection result to the detection instruction unit.

Description

An intelligent detection method for built-in antennas of vehicle-mounted Internet of Things terminals Technical Field

[0001] The present invention relates to the field of automotive Internet of Things, and in particular to an intelligent detection method for a built-in antenna of an on-board Internet of Things terminal. Background Art

[0002] There are two existing methods for detecting antennas in Internet of Vehicles:

[0003] One approach involves adding a detection circuit to the vehicle terminal and a pull-down resistor to the antenna. This circuit forms a DC detection loop when the RF connector connects to the external antenna to form an RF channel. By detecting the voltage, the system can determine whether the external antenna is plugged in. However, this only detects whether the external antenna is plugged in; it cannot effectively detect an antenna that is plugged in but exhibits abnormal performance.

[0004] The second method is to add a coupling station on the assembly line, use a comprehensive tester and a coupling box to build a coupling environment, control the comprehensive tester through the comprehensive test tool on the PC, and use the flat antenna in the coupling box to detect whether the TX and RX indicators of the object under test pass the threshold to determine whether the built-in antenna is installed correctly. The traditional non-signaling coupling detection method is time-consuming and labor-intensive. Technical issues

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a simple and low-cost method to realize the detection of the Internet of Vehicles antenna during the production and use stages, and to clearly determine whether the antenna is connected correctly and whether the status is abnormal. Technical Solutions

[0006] To achieve the above object, the present invention provides an intelligent detection method for a built-in antenna of an on-board Internet of Things terminal, wherein the on-board Internet of Things terminal comprises:

[0007] Built-in main antenna, including antenna feed point and antenna ground feed point;

[0008] The antenna tuning switch includes ports RF0, RF1, RF2, RF3, and RF4. The RF0 port is connected to the antenna ground feed point. The RF1 port is connected to the ground feed point through R1 to achieve antenna state 0. The RF2 port is connected to the ground feed point through inductor L1 to achieve antenna state 1. The RF3 port is connected to the ground feed point through inductor L2 to achieve antenna state 2. The RF4 port is connected to the ground feed point through capacitors C1 and R2 (10kΩ / 100kΩ) to achieve antenna state 3. Antenna states 0-3 are four independent states, and the four states cannot appear at the same time. Switching different switch states realizes different frequency bands. Antenna states 0-3 together achieve different frequency band coverage.

[0009] The AP is a NAD module, which controls the switch through GPIO or MIPI to complete the switching of the four channels; the antenna feed point of the built-in main antenna is connected to the main RF port of the AP;

[0010] VP, the VP including ANT Power and VP_ANT_ADCS;

[0011] The ANT Power output 3.3V voltage supplies power to the voltage detection unit. After passing through the voltage detection unit, it is connected to the main RF path via inductor L0. The main RF path is the path from the NAD's LTE main ANT port to the antenna feed point of the built-in main antenna, used to transmit RF signals. The inductor L0 isolates the electrical signal from the RF signal path, ensuring that the RF signal is transmitted only in the main RF path.

[0012] The VP_ANT_ADCS is a pin built into the VP, which reports the detection voltage collected by the voltage detection unit to the VP. The VP determines the antenna status based on the voltage reported by the voltage detection unit.

[0013] Detection command unit, used to send detection commands to the VP, and the VP sends the corresponding commands to the AP

[0014] The steps include:

[0015] S30, the detection instruction unit sends the detection command to the VP, and the VP sends the corresponding command to the AP.

[0016] At step S50, the AP controls the RF0 and RF1 ports of the antenna tuning switch Switch to conduct. The detection command unit collects the voltage value indicating the conduction of the RF1 path and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF1 sub-path conduction, and stores the value.

[0017] At step S70, the AP controls the RF0 and RF2 ports of the antenna tuning switch Switch to conduct. The detection command unit collects the voltage value indicating the conduction of the RF1 path and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF2 sub-path conduction, and stores the value.

[0018] At step S90, the AP controls the antenna tuning switch to connect the RF0 and RF3 ports. The detection command unit collects the voltage value indicating the RF1 path is on and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF3 sub-path, and stores the value.

[0019] At step S110, the AP controls the antenna tuning switch to connect the RF0 and RF4 ports. The detection command unit collects the voltage value indicating the RF1 path is connected and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF4 sub-path, and stores the value.

[0020] The VP makes a built-in judgment on the antenna status of the RF1, RF2, RF3, and RF4 sub-paths being turned on, and returns the final detection result to the detection instruction unit.

[0021] Furthermore, the range given by the internal preset threshold is:

[0022] The voltage is between 1.5-2V, the antenna is in place and in normal condition, and the sub-channel antenna is in normal condition;

[0023] The voltage is greater than 2V or less than 1.5V. The antenna is in place but in an abnormal state, and the sub-channel antenna is in an abnormal state.

[0024] The voltage is 0V, the antenna is not in place, and the antenna line is open.

[0025] Furthermore, the steps of the built-in judgment are as follows:

[0026] a The RF1, RF2, RF3, RF4 sub-paths are all normal, determining the antenna status is normal;

[0027] b The RF1, RF2, RF3, RF4 sub-paths are all abnormal, determining the antenna state is abnormal;

[0028] c The RF1, RF2, RF3, RF4 sub-paths are all open, it is determined that the antenna state is open;

[0029] d. The RF1, RF2, RF3, RF4 sub-paths and other situations determine the antenna tuning switch failure.

[0030] Furthermore, the detection instruction unit is an external detection equipment independent of the vehicle-mounted Internet of Things terminal.

[0031] Furthermore, the method further includes the following steps:

[0032] S10, the external testing equipment is a computer terminal with a built-in comprehensive testing tool. The comprehensive testing tool is run on the PC tool to power on the in-vehicle IoT terminal to be tested, and the in-vehicle IoT terminal is controlled to enter an engineering test mode;

[0033] S20, the detection command unit is connected to the VP in the vehicle-mounted Internet of Things terminal;

[0034] Furthermore, the detection instruction unit is built into the vehicle-mounted Internet of Things terminal.

[0035] Furthermore, the detection instruction unit is a built-in software, which is connected to the VP to complete regular detection and report to the background server. Beneficial effects

[0036] The technical solution of this invention utilizes an antenna tuning switch to switch between different paths, combined with voltage testing, to determine whether the internal antenna is properly installed. This testing method can be performed alongside other functions at the semi-finished product station, eliminating the need for additional testing stations. This allows for testing of connected vehicle antennas during both production and use, ensuring proper antenna connection and determining any abnormalities in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a structural diagram of a prior art electrical appliance;

[0038] FIG2 is another prior art implementation diagram;

[0039] FIG3 is an electronic structure diagram of the present invention;

[0040] FIG4 is a flow chart of a method according to a preferred embodiment of the present invention;

[0041] FIG5 is a flow chart of a method according to a preferred embodiment of the present invention. Best Mode for Carrying Out the Invention

[0042] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0043] In the drawings, components with identical structures are denoted by the same reference numerals, and components with similar structures or functions are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrary and are not limited by the present invention. For clarity, the thickness of components in some places in the drawings is appropriately exaggerated.

[0044] As shown in Figure 1, prior art 1 uses a pull-down resistor R4 at the antenna terminal. If an antenna is plugged in, the voltage is pulled down. The presence of an external antenna is determined by monitoring the ANT_ADC status. A detection circuit is added to the vehicle terminal, along with a pull-down resistor at the antenna terminal. This detection circuit forms a DC detection loop when the RF connector connects to the external antenna, forming an RF channel. The voltage level is then used to determine if the external antenna is plugged in.

[0045] The disadvantage of this technical solution is that it can only detect whether the external antenna is inserted, and the state where the antenna is inserted but has abnormal performance cannot be effectively detected.

[0046] As shown in Figure 2, the second existing technology establishes a coupling environment. During testing, the DUT enters FTM (factory test mode) mode and is connected to a PC via a USB cable, forming a closed-loop test. A comprehensive test tool is run on the PC to control the comprehensive tester to transmit and receive RF signals. The flat antenna in the coupling box detects the DUT's TX and RX indicators. The comprehensive test tool determines whether they pass the threshold to verify the correct installation of the built-in antenna. A coupling station is added to the assembly line. A coupling environment is established using the comprehensive tester and coupling box. The comprehensive tester is controlled by the comprehensive test tool on the PC, and the flat antenna in the coupling box detects whether the DUT's TX and RX indicators pass the threshold to verify the correct installation of the built-in antenna.

[0047] The disadvantages of this technical solution are that it is necessary to purchase a comprehensive tester and a coupling box, which is expensive, and it is necessary to build a separate coupling station for testing, which is time-consuming and labor-intensive.

[0048] A preferred embodiment of the present invention is shown in FIG3 , where the vehicle-mounted Internet of Things terminal includes:

[0049] Built-in main antenna, including antenna feed point and antenna ground feed point;

[0050] The antenna tuning switch, Swtich, includes ports RF0, RF1, RF2, RF3, and RF4. The RF0 port is connected to the antenna ground feed point. The RF1 port is connected to the ground feed point through R1 to achieve antenna state 0. The RF2 port is connected to the ground feed point through inductor L1 to achieve antenna state 1. The RF3 port is connected to the ground feed point through inductor L2 to achieve antenna state 2. The RF4 port is connected to the ground feed point through capacitor C1 and R2 (10kΩ / 100kΩ) to achieve antenna state 3. Antenna states 0-3 are four independent states, and the four states cannot appear at the same time. Switching different switch states realizes different frequency bands. Antenna states 0-3 together achieve different frequency band coverage. The value ranges of related electronic components are as follows:

[0051] L0 between 100nH-200nH

[0052] R1 0Ω

[0053] L1 between 1nH and 5.6nH

[0054] L2 between 5.6nH-16nH

[0055] C1 between 0.5pF and 3.3pF

[0056] R2 10 / 100kΩ

[0057] The AP is a NAD module, which controls the switch through GPIO or MIPI to switch between four channels. The antenna feed point of the built-in main antenna is connected to the main RF port of the AP.

[0058] VP, VP includes ANT Power and VP_ANT_ADCS;

[0059] ANT Power 1 outputs a 3.3V voltage to power the voltage detection unit. After passing through voltage detection unit 3, it is connected to the main RF path via inductor L0. The main RF path is the path from the NAD's LTE main ANT port to the antenna feed point of the built-in main antenna, used to transmit RF signals. Inductor L0 isolates the electrical signal from the RF signal path, ensuring that the RF signal is transmitted only on the main RF path.

[0060] VP_ANT_ADCS2 is a pin built into VP. It reports the detection voltage collected by the voltage detection unit to VP. VP determines the antenna status based on the voltage reported by the voltage detection unit.

[0061] Detection command unit, used to send detection commands to VP, and VP sends corresponding commands to AP;

[0062] This embodiment includes the following steps:

[0063] S30, the detection instruction unit sends the detection command to the VP, and the VP sends the corresponding command to the AP.

[0064] At step S50, the AP controls the RF0 and RF1 ports of the antenna tuning switch Switch to conduct. The detection command unit collects the voltage value indicating the conduction of the RF1 path and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF1 sub-path conduction, and stores the value.

[0065] At step S70, the AP controls the RF0 and RF2 ports of the antenna tuning switch Switch to conduct. The detection command unit collects the voltage value indicating the conduction of the RF1 path and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF2 sub-path conduction, and stores the value.

[0066] At step S90, the AP controls the antenna tuning switch to connect the RF0 and RF3 ports. The detection command unit collects the voltage value indicating the RF1 path is on and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF3 sub-path, and stores the value.

[0067] At step S110, the AP controls the antenna tuning switch to connect the RF0 and RF4 ports. The detection command unit collects the voltage value indicating the RF1 path is connected and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF4 sub-path, and stores the value.

[0068] The VP makes a built-in judgment on the antenna status of the RF1, RF2, RF3, and RF4 sub-paths and returns the final detection result to the detection instruction unit.

[0069] The ranges given by the internal preset thresholds are:

[0070] The voltage is between 1.5-2V, the antenna is in place and in normal condition, and the sub-channel antenna is in normal condition;

[0071] The voltage is greater than 2V or less than 1.5V. The antenna is in place but in an abnormal state, and the sub-channel antenna is in an abnormal state.

[0072] The voltage is 0V, the antenna is not in place, and the antenna line is open.

[0073] The steps of built-in judgment are as follows:

[0074] a. RF1, RF2, RF3, and RF4 sub-paths are all normal, indicating that the antenna is in normal condition.

[0075] b. RF1, RF2, RF3, and RF4 sub-paths are all abnormal, indicating that the antenna status is abnormal;

[0076] c. RF1, RF2, RF3, and RF4 sub-paths are all open, and the antenna status is determined to be open;

[0077] d. For other situations in the RF1, RF2, RF3, and RF4 sub-channels, it is determined that the antenna tuning switch is faulty.

[0078] In another embodiment of the present invention, the detection instruction unit is an external detection equipment independent of the vehicle-mounted Internet of Things terminal.

[0079] The following steps are also included:

[0080] S10, the external testing equipment is a computer terminal with an embedded comprehensive test tool. The comprehensive test tool is run on the PC tool to power on the in-vehicle IoT terminal to be tested, and the in-vehicle IoT terminal is controlled to enter the engineering test mode;

[0081] S20, detecting the connection between the command unit and the VP in the vehicle-mounted IoT terminal;

[0082] S30, the detection instruction unit sends the detection command to the VP, and the VP sends the corresponding command to the AP.

[0083] At step S50, the AP controls the RF0 and RF1 ports of the antenna tuning switch Switch to conduct. The detection command unit collects the voltage value indicating the conduction of the RF1 path and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF1 sub-path conduction, and stores the value.

[0084] At step S70, the AP controls the RF0 and RF2 ports of the antenna tuning switch Switch to conduct. The detection command unit collects the voltage value indicating the conduction of the RF1 path and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF2 sub-path conduction, and stores the value.

[0085] At step S90, the AP controls the antenna tuning switch to connect the RF0 and RF3 ports. The detection command unit collects the voltage value indicating the RF1 path is on and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF3 sub-path, and stores the value.

[0086] At step S110, the AP controls the antenna tuning switch to connect the RF0 and RF4 ports. The detection command unit collects the voltage value indicating the RF1 path is connected and reports it to the VP. The VP compares the received voltage value with an internal preset threshold, determines the antenna status of the RF4 sub-path, and stores the value.

[0087] The VP makes a built-in judgment on the antenna status of the RF1, RF2, RF3, and RF4 sub-paths and returns the final detection result to the detection instruction unit.

[0088] The ranges given by the internal preset thresholds are:

[0089] The voltage is between 1.5-2V, the antenna is in place and in normal condition, and the sub-channel antenna is in normal condition;

[0090] The voltage is greater than 2V or less than 1.5V. The antenna is in place but in an abnormal state, and the sub-channel antenna is in an abnormal state.

[0091] The voltage is 0V, the antenna is not in place, and the antenna line is open.

[0092] The steps of built-in judgment are as follows:

[0093] a. RF1, RF2, RF3, and RF4 sub-paths are all normal, indicating that the antenna is in normal condition.

[0094] b. RF1, RF2, RF3, and RF4 sub-paths are all abnormal, indicating that the antenna status is abnormal;

[0095] c. RF1, RF2, RF3, and RF4 sub-paths are all open, and the antenna status is determined to be open;

[0096] d. For other situations in the RF1, RF2, RF3, and RF4 sub-channels, it is determined that the antenna tuning switch is faulty.

[0097] This embodiment utilizes an antenna tuning switch to switch between different paths, combined with voltage testing, to verify that the internal antenna is properly installed. This testing method can be performed alongside other functions at the semi-finished product station, eliminating the need for additional testing stations. This allows for testing of connected vehicle antennas during both production and use, ensuring proper antenna connection and determining any abnormalities in operation.

[0098] In another embodiment of the present invention, as shown in FIG4 , the detection instruction unit sends a detection command to the VP, and the VP sends a corresponding command to the AP; the AP controls the RF0 port and the RF1, RF2, RF3, and RF4 ports of the antenna tuning switch Switch to be turned on respectively; the detection instruction unit collects voltage values ​​indicating that the paths of the RF1, RF2, RF3, and RF4 ports are turned on respectively and reports them to the VP; the VP compares the received voltage values ​​with internal preset thresholds, determines the antenna states of the RF1, RF2, RF3, and RF4 port sub-paths being turned on respectively, and stores the values; the VP performs an internal determination on the antenna states of the RF1, RF2, RF3, and RF4 sub-paths being turned on and returns the final detection result to the detection instruction unit.

[0099] The ranges given by the internal preset thresholds are:

[0100] The voltage is between 1.5-2V, the antenna is in place and in normal condition, and the sub-channel antenna is in normal condition;

[0101] The voltage is greater than 2V or less than 1.5V. The antenna is in place but in an abnormal state, and the sub-channel antenna is in an abnormal state.

[0102] The voltage is 0V, the antenna is not in place, and the antenna line is open.

[0103] The steps of built-in judgment are as follows:

[0104] a. RF1, RF2, RF3, and RF4 sub-paths are all normal, indicating that the antenna is in normal condition.

[0105] b. RF1, RF2, RF3, and RF4 sub-paths are all abnormal, indicating that the antenna status is abnormal;

[0106] c. RF1, RF2, RF3, and RF4 sub-paths are all open, and the antenna status is determined to be open;

[0107] d. For other situations in the RF1, RF2, RF3, and RF4 sub-channels, it is determined that the antenna tuning switch is faulty.

[0108] This embodiment utilizes an antenna tuning switch to switch between different paths, combined with voltage testing, to verify that the internal antenna is properly installed. This testing method can be performed alongside other functions at the semi-finished product station, eliminating the need for additional testing stations. This allows for testing of connected vehicle antennas during both production and use, ensuring proper antenna connection and determining any abnormalities in operation.

[0109] In another embodiment of the present invention, a detection command unit is built into an in-vehicle IoT terminal. The detection command unit is a built-in software that is connected to the VP, completes regular detection, and reports to the backend server. The detection command unit sends a detection command to the VP, and the VP sends the corresponding command to the AP; the AP controls the RF0 port of the antenna tuning switch Switch and turns on the RF1, RF2, RF3, and RF4 ports respectively; the detection command unit collects the voltage values ​​of the RF1, RF2, RF3, and RF4 port paths and reports them to the VP; the VP compares the received voltage values ​​with internal preset thresholds, determines the antenna status of the RF1, RF2, RF3, and RF4 port sub-paths, and stores them; the VP makes an internal judgment on the antenna status of the RF1, RF2, RF3, and RF4 sub-paths and returns the final detection result to the detection command unit.

[0110] The ranges given by the internal preset thresholds are:

[0111] The voltage is between 1.5-2V, the antenna is in place and in normal condition, and the sub-channel antenna is in normal condition;

[0112] The voltage is greater than 2V or less than 1.5V. The antenna is in place but in an abnormal state, and the sub-channel antenna is in an abnormal state.

[0113] The voltage is 0V, the antenna is not in place, and the antenna line is open.

[0114] The steps of built-in judgment are as follows:

[0115] a. RF1, RF2, RF3, and RF4 sub-paths are all normal, indicating that the antenna is in normal condition.

[0116] b. RF1, RF2, RF3, and RF4 sub-paths are all abnormal, indicating that the antenna status is abnormal;

[0117] c. RF1, RF2, RF3, and RF4 sub-paths are all open, and the antenna status is determined to be open;

[0118] d. For other situations in the RF1, RF2, RF3, and RF4 sub-channels, it is determined that the antenna tuning switch is faulty.

[0119] This embodiment uses the antenna tuning switch to switch different paths, combined with voltage detection, to determine whether the built-in antenna is installed normally. This detection method can detect the vehicle network antenna during use, and determine whether the antenna is connected correctly and whether the operating status is abnormal.

[0120] In another embodiment of the present invention, as shown in FIG5 , a remote diagnostic device initiates a detection instruction, which is then sent to the vehicle to be diagnosed (TBOX) via the TSP server. After the T-BOX receives the detection instruction, the detection instruction unit reports the detection command from the AP to the VP. The VP initiates the detection process and finally reports the result to the TSP server, which returns it to the remote diagnostic device.

[0121] This embodiment uses an antenna tuning switch to switch between different paths, combined with voltage detection, to determine whether the internal antenna is properly installed. This detection method enables the detection of the vehicle network antenna during use, and determines whether the antenna is correctly connected and whether the operating status is abnormal.

[0122] The above describes in detail the preferred embodiments of the present invention. It should be understood that numerous modifications and variations based on the concepts of the present invention can be made by those skilled in the art without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims. Modes for Carrying Out the Invention

[0123] Type here a paragraph describing embodiments of the invention. Industrial Applicability

[0124] Type your industrial applicability description paragraph here. Sequence Listing Free Content

[0125] Type your sequence listing free description paragraph here.

Claims

1. An intelligent detection method for a built-in antenna of a vehicle-mounted Internet of Things terminal, the vehicle-mounted Internet of Things terminal comprising: Built-in main antenna, including antenna feed point and antenna ground feed point; The antenna tuning switch Swtich includes ports RF0, RF1, RF2, RF3 and RF4; the RF0 port is connected to the antenna ground feed point; the RF1 port is connected to the ground feed point through R1 to achieve the antenna state 0; the RF2 port is connected to the ground feed point through the inductor L1 to achieve the antenna state 1; the RF3 port is connected to the ground feed point through the inductor L2 to achieve the antenna state 2; the RF4 port is connected to the ground feed point through the capacitor C1 and R2 to achieve the antenna state 3; the antenna state 0-3 is 4 independent states, and the four states cannot appear at the same time. Switching different switch states realizes different frequency bands, and the antenna states 0-3 together realize different frequency band coverage; The AP is a NAD module, and the NAD module controls the Switch through GPIO or MIPI to complete the switching of the four paths; the antenna feed point of the built-in main antenna is connected to the main RF port of the AP; VP, the VP including ANT Power and VP_ANT_ADCS; The ANT Power outputs a 3.3V voltage to power the voltage detection unit. After passing through the voltage detection unit, it is connected to the main RF path via the inductor L0. The main RF path is the path from the LTE main ANT port of the NAD to the antenna feed point of the built-in main antenna, which is used to transmit RF signals. The inductor L0 serves to isolate the electrical signal and RF signal paths, ensuring that the RF signal is only transmitted in the main RF path. The VP_ANT_ADCS is a pin of the VP, which reports the detection voltage collected by the voltage detection unit to the VP. The VP determines the state of the antenna according to the voltage reported by the voltage detection unit. Detection command unit, used to send detection commands to the VP, and the VP sends corresponding commands to the AP It is characterized by comprising the following steps: S30, the detection instruction unit sends the detection command to the VP, and the VP sends the corresponding command to the AP. S50, the AP controls the RF0 port and the RF1 port of the antenna tuning switch Switch to be turned on; the detection instruction unit collects the voltage value of the RF1 path being turned on and reports it to the VP; the VP compares the received voltage value with the internal preset threshold value, determines the antenna state of the RF1 sub-path being turned on, and stores it; S70, the AP controls the RF0 port and the RF2 port of the antenna tuning switch Switch to be turned on; the detection instruction unit collects the voltage value of the RF1 path being turned on and reports it to the VP; the VP compares the received voltage value with the internal preset threshold value, determines the antenna state of the RF2 sub-path being turned on, and stores it; S90, the AP controls the RF0 port and the RF3 port of the antenna tuning switch Switch to be turned on; the detection instruction unit collects the voltage value of the RF1 path being turned on and reports it to the VP; the VP compares the received voltage value with the internal preset threshold value, determines the antenna state of the RF3 sub-path being turned on, and stores it; S110, the AP controls the RF0 port and the RF4 port of the antenna tuning switch Switch to be turned on; the detection instruction unit collects the voltage value of the RF1 path being turned on and reports it to the VP; the VP compares the received voltage value with the internal preset threshold value, determines the antenna state of the RF4 sub-path being turned on, and stores it; VP makes a built-in judgment on the antenna status of the RF1, RF2, RF3, and RF4 sub-paths being turned on, and returns the final detection result to the detection instruction unit.

2. The method according to claim 1, characterized in that The range given by the internal preset threshold is: The voltage is between 1.5-2V, the antenna is in place and in normal condition, and the sub-channel antenna is in normal condition; The voltage is >2V or less than 1.5V, the antenna is in place but in an abnormal state, and the sub-channel antenna is in an abnormal state; Voltage 0V, antenna not in place, antenna path wire status is open.

3. The method according to any one of claims 1 or 2, characterized in that: The steps of the built-in judgment are as follows: a. The RF1, RF2, RF3, RF4 sub-paths are all normal, determining that the antenna status is normal; b. The RF1, RF2, RF3, RF4 sub-paths are all abnormal, determining that the antenna state is abnormal; c. The RF1, RF2, RF3, RF4 sub-paths are all open, and the antenna state is determined to be open; d. Other situations of the RF1, RF2, RF3, and RF4 sub-channels determine that the antenna tuning switch is faulty.

4. The method according to claim 1, characterized in that The detection instruction unit is an external detection equipment independent of the vehicle-mounted Internet of Things terminal.

5. The method according to claim 4, characterized in that The following steps are also included: S10, the external detection equipment is a computer terminal with a built-in comprehensive test tool, the comprehensive test tool is run on the PC tool, the vehicle-mounted Internet of Things terminal to be tested is powered on, and the vehicle-mounted Internet of Things terminal is controlled to enter an engineering test mode; S20, the detection instruction unit is connected to the VP in the vehicle-mounted Internet of Things terminal.

6. The method according to claim 1, characterized in that The detection instruction unit is built into the vehicle-mounted Internet of Things terminal.

7. The method according to claim 6, characterized in that The detection instruction unit is a built-in software, which is connected to the VP to complete regular detection and report to the background server.

8. The method according to claim 1, characterized in that The setting range of R2 is 10kΩ / 100kΩ.

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