A portable 5T equipment intelligent tracking system performance tester

Abstract

The present invention discloses a portable 5T equipment intelligent tracking system performance detector, including a radio frequency antenna and a main control circuit, the main control circuit includes a radio frequency module circuit, the radio frequency module circuit includes a low noise amplifier chip U2 and a microprocessor controller chip U1, the radio frequency antenna is connected to the low noise amplifier chip U2 via a high frequency narrowband filter, and the low noise amplifier chip U2 is connected to the microprocessor controller chip U1 via a signal processing circuit. The present invention uses a high frequency narrowband filter to filter the clutter contained in the received signal, uses a low noise amplifier to amplify the received weak signal, mixes the signal passing through the low noise amplifier, generates an intermediate frequency signal, performs analog-to-digital conversion after amplifying the intermediate frequency signal, and uses a microprocessor controller chip to calculate the electric field strength and frequency. The detector can store and upload measurement data, which is convenient for users to view measurement data on different terminal devices, and has the advantages of accurate measurement and convenient operation.

Description

Technical Field

[0001] The invention belongs to the technical field of railway equipment, and in particular relates to a portable 5T equipment intelligent tracking system performance detector. Background Art

[0002] The 5T equipment intelligent tracking system is the application of the automatic vehicle identification system on the 5T equipment. The 5T equipment uses the automatic vehicle identification system and the label installed on the bottom of the train to track and accurately locate the train. Various sensors in the 5T equipment collect and analyze the working conditions, performance, and status of various components on the train, determine the faulty hot axle, brake, and accessory breakage that endanger the driving safety during the train operation, and provide an important basis for stopping and handling.

[0003] The car number antenna is the information transmitting and receiving device of the automatic car number recognition system. The effect of the system's working performance will eventually be reflected on the car number antenna. In order to ensure that the railway car number automatic recognition system works in the best condition all day long and can completely and correctly read the vehicle information stored in the tag of each car, the detection of the car number antenna is one of the most important links in the maintenance of 5T equipment.

[0004] Currently, vehicle license plate antenna detection mostly uses simulated vehicle license plate tags for manual work, which results in inaccurate measurement results, low efficiency, and inconvenient daily maintenance and repair.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a portable 5T equipment intelligent tracking system performance tester that can automatically detect the transmission frequency and electric field strength of the signal transmitted by the vehicle number antenna.

[0007] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0008] A portable 5T equipment intelligent tracking system performance tester includes a radio frequency antenna and a main control circuit. The main control circuit includes a radio frequency module circuit. The radio frequency module circuit includes a low-noise amplifier chip U2 and a microprocessor controller chip U1. The radio frequency antenna is connected to the low-noise amplifier chip U2 via a high-frequency narrowband filter. The low-noise amplifier chip U2 is connected to the microprocessor controller chip U1 via a signal processing circuit.

[0009] Preferably, the high-frequency narrowband filter includes an inductor L1, a capacitor C1, a capacitor C4, and a capacitor C5. The first end of the inductor L1 and the first end of the capacitor C4 are connected to the RF antenna, the second end of the inductor L1 is connected to the first end of the capacitor C1 and the first end of the capacitor C5, the second end of the capacitor C4 and the second end of the capacitor C5 are grounded, and the second end of the capacitor C1 is connected to the IN pin of the low-noise amplifier chip U2.

[0010] Preferably, the signal processing circuit includes inductor L2, inductor L3, inductor L4, capacitor C3, capacitor C6, capacitor C7, and capacitor C11, the J2 pin of the low-noise amplifier chip U2 is connected to the first end of the inductor L2 and the first end of the capacitor C3, the second end of the inductor L2 is connected to the first end of the capacitor C6 and the first end of the inductor L3, the second end of the inductor L3 is connected to the first end of the capacitor C7 and the first end of the inductor L4, the second end of the capacitor C3, the second end of the capacitor C6, and the second end of the capacitor C7 are grounded, and the second end of the inductor L4 is connected to the TX pin of the microprocessor controller chip U1 via the capacitor C11.

[0011] Preferably, the signal processing circuit also includes an inductor L5, a capacitor C16 and a capacitor C17, the J3 pin of the low-noise amplifier chip U2 is connected to the first end of the capacitor C16, the second end of the capacitor C16 is connected to the first end of the inductor L5, the second end of the inductor L5 is grounded via the capacitor C17, the RXP pin of the microprocessor controller chip U1 is connected to the first end of the inductor L5, and the RXN pin of the microprocessor controller chip U1 is connected to the second end of the inductor L5.

[0012] Preferably, the VDD pin of the microprocessor controller chip U1 is connected to the first end of the capacitor C12 and the first end of the resistor R3, capacitors C8, C9 and C10 are connected in parallel at both ends of the capacitor C12, the first end of the capacitor C12 is connected to the first power supply, the second end of the capacitor C12 is grounded, and the second end of the resistor R3 is connected to the TX pin of the microprocessor controller chip U1 via the inductor L6.

[0013] Preferably, the IN pin of the low noise amplifier chip U2 is connected to the second end of the capacitor C1, the VC1 pin of the low noise amplifier chip U2 is connected to the resistor R1, the VC2 pin of the low noise amplifier chip U2 is connected to the resistor R2, and the GND pin of the low noise amplifier chip U2 is grounded.

[0014] Preferably, a crystal oscillator Y1 is connected between the XIN pin of the microprocessor controller chip U1 and the XOUT pin of the microprocessor controller chip U1, the VR_DIG pin of the microprocessor controller chip U1 is connected to the first end of capacitor C14 and the first end of capacitor C15, the second end of capacitor C14 and the second end of capacitor C15 are grounded, the pin VDD_DIG of the microprocessor controller chip U1 is connected to the first end of capacitor C13 and the second power supply, and the second end of capacitor C13 is grounded.

[0015] Preferably, the main control circuit also includes a ranging module, which includes a gyroscope chip U3, a CLKIN pin of the gyroscope chip U3 is connected to the first end of the capacitor C11 and a reference ground, a VLOGIC pin of the gyroscope chip U3 is connected to the second end of the capacitor C11 and a third power supply, and a capacitor C13 is connected between the REGOUT pin of the gyroscope chip U3 and the FSYNC pin of the gyroscope chip U3; the SDA pin of the gyroscope chip U3 is connected to the first end of the resistor R4, the SCL pin of the gyroscope chip U3 is connected to the first end of the resistor R5, and the second end of the resistor R4 and the second end of the resistor R5 are connected to the fourth power supply; the CPOUT pin of the gyroscope chip U3 is coupled to the reference ground via the resistor C14, the VDD pin of the gyroscope chip U3 is connected to the first end of the capacitor C102 and the fifth power supply, and the second end of the capacitor C102 is grounded.

[0016] Preferably, the ranging module also includes an electrical connector J1 and an electrical connector J2, the XDA pin of the gyroscope chip U3 is connected to pin 1 of the electrical connector J1, the XCL pin of the gyroscope chip U3 is connected to pin 2 of the electrical connector J1, the INT pin of the gyroscope chip U3 is connected to pin 4 of the electrical connector J1, and the pin of the electrical connector J1 is grounded via a resistor R6; the SCL pin of the gyroscope chip U3 is connected to pin 3 of the electrical connector J2, the SDA pin of the gyroscope chip U3 is connected to pin 4 of the electrical connector J2, pin 1 of the electrical connector J2 is connected to the sixth power supply, and pin 2 of the electrical connector J2 is grounded.

[0017] Preferably, the ranging module also includes an LDO regulator chip U4, the VIN pin of the LDO regulator chip U4 is connected to the first end of the capacitor C3 and the seventh power supply, the GND pin of the LDO regulator chip U4 is grounded, the EN pin of the LDO regulator chip U4 is connected to the first end of the capacitor C3, the VOUT pin of the LDO regulator chip U4 is connected to the first end of the capacitor C10, the capacitor C12 and the capacitor C10 are connected in parallel, the second end of the capacitor C10 is grounded, the first end of the capacitor C10 is connected to the eighth power supply and the first end of the resistor R201, the second end of the resistor R201 is connected to the positive electrode of the light-emitting diode D1, and the negative electrode of the light-emitting diode D1 is grounded.

[0018] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0019] The present invention processes the signal received by the radio frequency antenna through a high-frequency narrowband filter to filter out most of the clutter. The signal is processed by a low-noise amplifier, which can amplify the received weak signal and reduce the interference of the amplifier itself to the signal. The signal passing through the low-noise amplifier is mixed to generate an intermediate frequency signal, and the intermediate frequency signal is amplified and then analog-to-digital conversion is performed. After the analog signal is converted into a digital signal, the electric field strength and frequency are calculated using a microprocessor controller chip. The portable 5T equipment intelligent tracking system performance tester can store and upload measurement data, which is convenient for users to view measurement data on different terminal devices, and has the advantages of accurate measurement and convenient operation.

[0020] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0022] Figure 1 This is the external structure diagram of the portable 5T equipment intelligent tracking system performance tester of the present invention;

[0023] Figure 2 is a circuit diagram of a radio frequency module of the present invention;

[0024] Figure 3 is a circuit diagram of a gyroscope of the present invention;

[0025] Figure 4 It is a schematic diagram of the internal structure of the SDRAM of the present invention;

[0026] Figure 5 It is a power supply charging management circuit diagram of the present invention;

[0027] Figure 6 It is a distance measurement schematic diagram of the present invention;

[0028] Figure 7 It is the anti-interference flow chart of the present invention;

[0029] Figure 8 It is a software flow chart of the operating system of the present invention.

[0030] In the figure: 1. Shell; 2. Display screen; 3. Keyboard; 4. RF antenna.

[0031] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0033] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figure 1 As shown, the embodiment of the present invention introduces a portable 5T device intelligent tracking system performance tester, including a housing 1, on which a display screen 2, a keyboard 3 and a radio frequency antenna 4 are installed, and inside the housing there is a main control circuit connected to the radio frequency antenna 4 and the keyboard, and the main control circuit includes a radio frequency module circuit. Figure 2 As shown, the RF module circuit includes a low-noise amplifier chip U2 and a microprocessor controller chip U1. The RF antenna is connected to the low-noise amplifier chip U2 via a high-frequency narrowband filter, and the low-noise amplifier chip U2 is connected to the microprocessor controller chip U1 via a signal processing circuit.

[0036] The high-frequency narrowband filter includes an inductor L1, a capacitor C1, a capacitor C4, and a capacitor C5. The first end of the inductor L1 and the first end of the capacitor C4 are connected to the radio frequency antenna, the second end of the inductor L1 is connected to the first end of the capacitor C1 and the first end of the capacitor C5, the second end of the capacitor C4 and the second end of the capacitor C5 are grounded, and the second end of the capacitor C1 is connected to the IN pin of the low-noise amplifier chip U2.

[0037] The signal processing circuit includes inductor L2, inductor L3, inductor L4, capacitor C3, capacitor C6, capacitor C7, and capacitor C11. The J2 pin of the low-noise amplifier chip U2 is connected to the first end of the inductor L2 and the first end of the capacitor C3. The second end of the inductor L2 is connected to the first end of the capacitor C6 and the first end of the inductor L3. The second end of the inductor L3 is connected to the first end of the capacitor C7 and the first end of the inductor L4. The second end of the capacitor C3, the second end of the capacitor C6, and the second end of the capacitor C7 are grounded. The second end of the inductor L4 is connected to the TX pin of the microprocessor controller chip U1 via the capacitor C11.

[0038] The signal processing circuit also includes an inductor L5, a capacitor C16 and a capacitor C17. The J3 pin of the low-noise amplifier chip U2 is connected to the first end of the capacitor C16, the second end of the capacitor C16 is connected to the first end of the inductor L5, the second end of the inductor L5 is grounded via the capacitor C17, the RXP pin of the microprocessor controller chip U1 is connected to the first end of the inductor L5, and the RXN pin of the microprocessor controller chip U1 is connected to the second end of the inductor L5.

[0039] The VDD pin of the microprocessor controller chip U1 is connected to the first end of the capacitor C12 and the first end of the resistor R3. Capacitors C8, C9 and C10 are connected in parallel at both ends of the capacitor C12. The first end of the capacitor C12 is connected to the first power supply, the second end of the capacitor C12 is grounded, and the second end of the resistor R3 is connected to the TX pin of the microprocessor controller chip U1 via the inductor L6.

[0040] The IN pin of the low noise amplifier chip U2 is connected to the second end of the capacitor C1, the VC1 pin of the low noise amplifier chip U2 is connected to the resistor R1, the VC2 pin of the low noise amplifier chip U2 is connected to the resistor R2, and the GND pin of the low noise amplifier chip U2 is grounded.

[0041] A crystal oscillator Y1 is connected between the XIN pin of the microprocessor controller chip U1 and the XOUT pin of the microprocessor controller chip U1, a VR_DIG pin of the microprocessor controller chip U1 is connected to the first end of capacitor C14 and the first end of capacitor C15, a second end of capacitor C14 and a second end of capacitor C15 are grounded, a pin VDD_DIG of the microprocessor controller chip U1 is connected to the first end of capacitor C13 and the second power supply, and a second end of capacitor C13 is grounded.

[0042] The main control circuit also includes a distance measurement module, such as Figure 3As shown, the ranging module includes a gyroscope chip U3, a CLKIN pin of the gyroscope chip U3 is connected to the first end of the capacitor C11 and the reference ground, a VLOGIC pin of the gyroscope chip U3 is connected to the second end of the capacitor C11 and the third power supply, and a capacitor C13 is connected between the REGOUT pin of the gyroscope chip U3 and the FSYNC pin of the gyroscope chip U3; an SDA pin of the gyroscope chip U3 is connected to the first end of the resistor R4, an SCL pin of the gyroscope chip U3 is connected to the first end of the resistor R5, and the second end of the resistor R4 and the second end of the resistor R5 are connected to the fourth power supply; a CPOUT pin of the gyroscope chip U3 is coupled to the reference ground via a resistor C14, a VDD pin of the gyroscope chip U3 is connected to the first end of the capacitor C102 and the fifth power supply, and the second end of the capacitor C102 is grounded.

[0043] The ranging module also includes an electrical connector J1 and an electrical connector J2. The XDA pin of the gyroscope chip U3 is connected to pin 1 of the electrical connector J1, the XCL pin of the gyroscope chip U3 is connected to pin 2 of the electrical connector J1, the INT pin of the gyroscope chip U3 is connected to pin 4 of the electrical connector J1, and the pin of the electrical connector J1 is grounded via a resistor R6; the SCL pin of the gyroscope chip U3 is connected to pin 3 of the electrical connector J2, the SDA pin of the gyroscope chip U3 is connected to pin 4 of the electrical connector J2, pin 1 of the electrical connector J2 is connected to the sixth power supply, and pin 2 of the electrical connector J2 is grounded.

[0044] The ranging module also includes an LDO regulator chip U4, a VIN pin of the LDO regulator chip U4 is connected to the first end of the capacitor C3 and the seventh power supply, a GND pin of the LDO regulator chip U4 is grounded, an EN pin of the LDO regulator chip U4 is connected to the first end of the capacitor C3, a VOUT pin of the LDO regulator chip U4 is connected to the first end of the capacitor C10, capacitors C12 and C10 are connected in parallel, a second end of the capacitor C10 is grounded, a first end of the capacitor C10 is connected to the eighth power supply and a first end of a resistor R201, a second end of the resistor R201 is connected to the positive electrode of the light-emitting diode D1, and a negative electrode of the light-emitting diode D1 is grounded.

[0045] In this embodiment, the display screen adopts a 3.2-inch wide-viewing angle TFTLCD display screen, and the display format is 320RGB×480. The TFTLCD display screen has many advantages such as good brightness, high contrast, strong layering, and bright colors. It is currently the mainstream LCD display. In order to ensure that the font display is clear under direct sunlight, the display brightness and contrast are debugged. The display chip adopts a 40-pin TFT display module, the power chip adopts ILI9341, the power supply voltage is 3.3V, and the data I / O is 16 lines.

[0046] In this embodiment, a 32-bit central control processor STM32 chip is used, which is mainly used for high-performance, low-cost, and low-power embedded applications. This is a chip based on the ARMCortex-M7 core MCU combined with wireless radio frequency. It has both general MCU resources and external devices inside, as well as special radio frequency modules, with a total of 176 external pins. The highest clock frequency is 400MHz, there are 140 I / O control ports on the periphery, and there are large-capacity program memory ROM and erasable memory RAM.

[0047] In this embodiment, the portable 5T device intelligent tracking system performance tester also includes a MicroSD card, which is used as data storage. The MicroSD card is a new generation of memory device based on semiconductor flash memory, which has excellent characteristics such as small size, fast data transmission speed, and hot pluggable. The communication interface with the MCU is the SD / SDIOMMC card host interface (SDIO). SDIO has the following main features: fully compatible with the multimedia card system specification version 4.2, the MicroSD card supports three different data bus modes, including 1-bit mode (default), 4-bit mode and 8-bit mode. For the 8-bit mode, the data transmission is up to 48MHz; fully compatible with the MicroSD memory card specification version 2.0, the card supports two different data bus modes, including 1-bit mode (default) and 4-bit mode; data and command output enable signals to control external bidirectional drivers.

[0048] In this embodiment, the portable 5T device intelligent tracking system performance tester uses synchronous dynamic random access memory (SDRAM for short). SDRAM is a dynamic random access memory with a synchronous interface. Figure 4 As shown, the "control logic" inside the SDRAM directs the operation of the entire system. The external system can input commands to the control logic through CS, WE, CAS, RAS and address lines. The commands are decoded by the "command decoder" and the control parameters are saved in the "mode register". The control logic runs accordingly.

[0049] like Figure 5 In the embodiment shown, the portable 5T device intelligent tracking system performance tester is powered by a lithium battery and uses a battery management chip for constant current and constant voltage linear charging. The charging cut-off voltage is 4.2V, and the charging current can be set by an external resistor. When the charging current drops to the set value, the battery management chip automatically ends the charging process. When the input voltage is removed, the chip automatically enters an ultra-low power standby state, reducing the standby current to 1uA. When there is input power, it can also be placed in shutdown mode, thereby reducing the operating current to 70uA.

[0050] In this embodiment, in order to facilitate the timely transmission and storage of measurement data, the portable 5T equipment intelligent tracking system performance tester has three data transmission functions: NB-Lot wireless network transmission, USB transmission, and Bluetooth transmission. The portable 5T equipment intelligent tracking system performance tester has a reserved NB-Lot wireless network module. When data needs to be transmitted, it can connect to the mobile network, access the pre-set virtual static IP address and transmit related measurement data. Users can receive and browse related data through mobile phones, computers or other terminal devices. The measurement data can be transferred to a computer or other device through a USB connection for user viewing.

[0051] Install the corresponding APP on the existing mobile phone or other device. After opening the APP, establish a connection between the mobile phone or other device and the portable 5T equipment intelligent tracking system performance tester through the Bluetooth function, transfer the data to the mobile phone or other device and save it. The portable 5T equipment intelligent tracking system performance tester is paired with the mobile phone or other device via Bluetooth, search for the pre-set name, and enter the login password after the connection is established. The portable 5T equipment intelligent tracking system performance tester sends data signals through the Bluetooth module and transmits them in the form of hexadecimal numbers. The transmitted data is received on the mobile phone or other device and saved locally. The test data is saved in the form of a table. The first line of the table is the title row and cannot be modified. When the data in the table is greater than 300 items, the first data is automatically overwritten, and the new data is progressive. The table content has a query function, and the user can enter the date and work location information for query.

[0052] Table 1 Test data summary

[0053]

[0054] like Figure 6 As shown, in this embodiment, tests are performed at three measuring points, and measuring point A is located directly above the vehicle number antenna D and is 1m away from the vehicle number antenna. Measuring point B is located at the upper left of the vehicle number antenna D and is at the same height as measuring point A, and is 1.2m away from the vehicle number antenna D. Measuring point C is located at the upper right of the vehicle number antenna D and is at the same height as measuring point A, and is 1.2m away from the vehicle number antenna D. The train passes through measuring point B, measuring point A, and measuring point C in sequence. The portable 5T device intelligent tracking system performance tester disclosed in the present invention has a prompt function, and will give an intermittent tone prompt when the three measuring points are located. The transmission frequency of the vehicle number antenna is 910.1MHz, 912.1MHz or 914.1MH, and the error range between the measured frequency and the transmission frequency of the vehicle number antenna is [-25KHz, 25KHz].

[0055] In this embodiment, due to the complex electromagnetic environment of the railway station and various interference signals, an optimized circuit board design is adopted and a large-scale integrated circuit is used. At the same time, a high-frequency narrowband filter is added to the RF antenna feeder port to filter out most of the clutter. Figure 7 As shown, for adjacent frequency interference or co-frequency interference pulse signals generated near the frequency point, the frequency point is identified using the sweep mode. The same frequency is identified as a useful frequency only when it is read continuously for more than 20 times. At the same time, the guard-free mean filtering algorithm is added to filter out the interference frequency.

[0056] Since the portable 5T device intelligent tracking system performance tester is a receiving device and does not emit electromagnetic waves to the outside, only the following three electromagnetic interference effects are tested: 1) Radiated interference resistance, use a signal generator to generate 80MHz-1GHz wireless signals, scan step size 1%, modulate 1KHz sine signal, the portable 5T device intelligent tracking system performance tester works normally, there is no user-perceivable loss of function and data loss; 2) Electrostatic interference resistance, use 2KV static electricity at the charging port, after the antenna port contact discharge (GB / T17626.2) test, it can be turned on normally, and it can work normally after turning on, without user-perceived loss of function and data loss; 3) Conducted interference resistance, since the portable 5T device intelligent tracking system performance tester is not connected to the charger when working, this interference can be ignored.

[0057] In this embodiment, after the microwave signal emitted by the car number antenna is received by the radio frequency antenna, it is filtered by the filter and then amplified by the low noise amplifier. The signal passing through the low noise amplifier is mixed to generate an intermediate frequency signal, and automatic gain control is used at the same time. After the intermediate frequency signal is amplified, analog-to-digital conversion is performed, and the electric field strength and frequency are calculated by the microprocessor controller chip after the analog signal is converted into a digital signal.

[0058] In this embodiment, the detector adopts open-circuit measurement in space, and uses an omnidirectional antenna to detect the size of the electrical signal induced by the antenna at the measurement point in space to represent the electric field strength at that point. Therefore, for the electric field strength at the measurement point in space, it is necessary to pass through the RF antenna, antenna interface, and filter before level acquisition. The receiving characteristics of the RF antenna can also be characterized by the RF antenna coefficient AF to determine the actual electric field strength at the RF antenna. The antenna coefficient is calculated using the parameters of the RF antenna, including gain, effective length, and effective aperture. When the system is well matched, the system impedance is 50Ω. Taking into account the matching attenuation of some RF antennas and components, when calculating the electric field strength at the measurement point in space, the calculation formula for the electric field strength based on electromagnetic field theory and component parameters is as follows:

[0059] E=E r -G a -20lgL e +L f +6

[0060]

[0061] AF=G a -20lgL e +L f +6

[0062] Among them, Er represents the level transmitted from the RF antenna to the RF module circuit, E represents the electric field level at the measurement point in the actual space, Ga represents the RF antenna gain on the detector, which is 2dBi, approximately 0dBd, and Lf represents the antenna feeder loss and insertion loss, which is related to factors such as the RF antenna gain, effective length, frequency, and opening attenuation insertion loss. Here, the theoretical estimated loss of the standard test antenna is used, which is set to 11.5dBm. Le represents the effective length of the RF antenna, with a frequency of 912Mhz, a wavelength λ of 0.329m, and a free space impedance of 120πΩ. The value of Le is 0.1047.

[0063] In one embodiment of the present invention, the electric field strength at the measuring point A is set to 3V / m through a microwave signal transmitting device, the signal transmission frequency is 914.10MHz, and the portable 5T device intelligent tracking system performance tester disclosed in the present invention is used to measure the level Er transmitted from the RF antenna to the RF module circuit to be 101dBuV, the antenna coefficient AF is set to 27.6dB, and the electric field strength at the measuring point A is calculated to be 128.6dBuV / m. After the unit is converted, the actually measured electric field strength is 2.691V / m, and the error with the set value is 0.309V / m.

[0064] In the test experiment, a standard dipole test antenna was used for calibration. First, a signal generator was used in the antenna darkroom to generate a 910.1MHz signal, and it was transmitted into space through a standard directional antenna. A calibrated field strength meter was used to receive the signal at 1.2m directly opposite the directional antenna, and the power of the signal generator was adjusted until the field strength meter displayed a field strength of 3V / m. At the same test point, a standard antenna was installed on the portable 5T equipment intelligent tracking system performance tester. The antenna coefficient of the standard antenna was calibrated to be 27.6dB, and the Er value displayed on the tester was 101.2dBuV. When the standard antenna was replaced with an ordinary antenna and tested again, the tester showed that the Er value was 92.5dBuV, with a difference of 8.7dBuV. This is due to the large antenna loss and antenna coefficient. Therefore, it is necessary to add a compensation value to Er based on the standard antenna. The compensation value range is 9-11dBuV.

[0065] In this embodiment, the portable 5T equipment intelligent tracking system performance tester uses the TF-Luna laser ranging module. Based on TOF, the ranging chip emits infrared modulated waves at a certain period, that is, 940nm wavelength light is emitted to the center point of the vehicle number antenna, and the refracted light is received at the same time. When the measurement starts, the infrared module emits 940nm infrared light waves to the measured object at a scanning frequency of 50HZ per second, and performs internal operations to calculate the real-time distance.

[0066] At test points B and C, that is, when the vertical distance from the center point of the vehicle number antenna is 1m and the horizontal distance is 1.2m, it is impossible for a single laser tester to measure the vertical distance and horizontal distance at the same time. Therefore, a gyroscope must be introduced to calculate the distance between test points B and C and the vehicle number antenna by measuring the angle. According to the vertical distance and horizontal distance between test point B or test point C and the vehicle number antenna, the angle between the connecting line between test point B or test point C and the center point of the vehicle number antenna and the horizontal plane is calculated to be 40 degrees.

[0067] As an inertial detection device, the gyroscope uses a resonant mass element and Coriolis acceleration to measure the angular velocity, and then integrates the angular velocity to obtain the required angle. In this embodiment, a 6-axis motion sensor digital gyroscope chip is used, which contains a 3-axis gyroscope and a 3-axis accelerometer. The complete 9-axis fusion calculation technology is mainly output to the application end in the form of a single data stream through the I2C port. At the same time, it can accurately track fast and slow movements, access external sensors through an auxiliary bus, and collect and process a full set of sensor data.

[0068] In this embodiment, the portable 5T equipment intelligent tracking system performance tester has a vehicle number tag reading function, and writes test information in the vehicle number tag. When the operator uses the portable 5T equipment intelligent tracking system performance tester to test near the site, the tracking system host must be set to simulate the passing vehicle state. In this state, the vehicle number recognition system will automatically read the built-in tag information of the portable 5T equipment intelligent tracking system performance tester and display it on the screen in the form of an energy slot, so as to actually verify the tag reading and writing status and the working status of the vehicle number recognition system.

[0069] When the intelligent tracking system host is turned on, the built-in label information of the portable 5T equipment intelligent tracking system performance tester is read in the following two situations: 1) If the complete vehicle number label information can be read, a green bar will be displayed in the label box of the measurement interface, and the label activation will be displayed in the measurement data record saving interface; 2) If the vehicle number label information is not read, a gray bar will be displayed in the label box of the measurement interface, and the label inactivation will be displayed in the measurement data record saving interface. If the intelligent tracking system host is not turned on, a gray bar will be displayed in the label box of the measurement interface, and the label inactivation will be displayed in the measurement data record saving interface.

[0070] Table 2 Built-in electronic tag code

[0071]

[0072] In this embodiment, the portable 5T equipment intelligent tracking system performance tester disclosed in the present invention is used to perform field measurements at the railway site. Figure 8 As shown, this embodiment introduces a portable 5T equipment intelligent tracking system performance tester operating system. After booting up, enter the boot password and administrator password, and then set the work area name, operator name and operator password. After the settings are completed, the device is handed over to the operator for measurement. The operator selects the measurement icon through the keyboard to enter the measurement selection interface, and then selects the lane number and measurement point to be tested to start measurement.

[0073] First, perform tag detection. Place the portable 5T device intelligent tracking system performance tester parallel to the vehicle number antenna and swing it slightly above the vehicle number antenna. If there is a signal, the tag display box will show green, and a pop-up information prompt box will show that the tag is activated; if there is no signal, the tag display box will show gray, and a pop-up information prompt box will show that the tag is not activated, and then automatically jump to the field strength test.

[0074] At measuring point A, place the portable 5T equipment intelligent tracking system performance tester horizontally at measuring point A. When the displayed distance value is 1m, the buzzer sounds. After keeping this position for 2 seconds, the measurement data record saving interface will pop up automatically. You can also directly pop up the record saving interface through keyboard operation. Similarly, at measuring points B and C, while meeting the vertical distance of 1m and the horizontal distance of 1.2m, the angle must be 40 degrees. At this time, the buzzer sounds, and after keeping this position for 2 seconds, the measurement data record saving interface will pop up automatically.

[0075] After the measurement is completed, the measurement data of each measurement point can be saved locally and stored in the MicroSD card. All data stored locally can be reviewed on site, and the saved measurement data can be queried according to the operation location and date. After the problem is found and maintained at the test site, it can be measured again at any time until the problem is solved. It can also be connected to a computer or other device via a USB data cable to transfer the measurement data to a computer or other device for storage. In addition, the measurement data can be transferred to a network server via a wireless network, and the server can be accessed through other devices to obtain the measurement data.

[0076] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A portable 5T equipment intelligent tracking system performance detector, comprising a radio frequency antenna and a main control circuit, wherein the main control circuit comprises a radio frequency module circuit, characterized in that: The RF module circuit includes a low-noise amplifier chip U2 and a microprocessor controller chip U1. The RF antenna is connected to the low-noise amplifier chip U2 via a high-frequency narrowband filter. The low-noise amplifier chip U2 is connected to the microprocessor controller chip U1 via a signal processing circuit. The main control circuit also includes a ranging module, which includes a gyroscope chip U3, a CLKIN pin of the gyroscope chip U3 is connected to the first end of the capacitor C11 and a reference ground, a VLOGIC pin of the gyroscope chip U3 is connected to the second end of the capacitor C11 and a third power supply, and a capacitor C13 is connected between the REGOUT pin of the gyroscope chip U3 and the FSYNC pin of the gyroscope chip U3; the SDA pin of the gyroscope chip U3 is connected to the first end of the resistor R4, the SCL pin of the gyroscope chip U3 is connected to the first end of the resistor R5, and the second end of the resistor R4 and the second end of the resistor R5 are connected to the fourth power supply; the CPOUT pin of the gyroscope chip U3 is coupled to the reference ground via the resistor C14, the VDD pin of the gyroscope chip U3 is connected to the first end of the capacitor C102 and the fifth power supply, and the second end of the capacitor C102 is grounded.

2. A portable 5T equipment intelligent tracking system performance detector according to claim 1, characterized in that: The high-frequency narrowband filter includes an inductor L1, a capacitor C1, a capacitor C4, and a capacitor C5. The first end of the inductor L1 and the first end of the capacitor C4 are connected to the radio frequency antenna, the second end of the inductor L1 is connected to the first end of the capacitor C1 and the first end of the capacitor C5, the second end of the capacitor C4 and the second end of the capacitor C5 are grounded, and the second end of the capacitor C1 is connected to the IN pin of the low-noise amplifier chip U2.

3. A portable 5T equipment intelligent tracking system performance detector according to claim 2, characterized in that: The signal processing circuit includes inductor L2, inductor L3, inductor L4, capacitor C3, capacitor C6, capacitor C7, and capacitor C11. The J2 pin of the low-noise amplifier chip U2 is connected to the first end of the inductor L2 and the first end of the capacitor C3. The second end of the inductor L2 is connected to the first end of the capacitor C6 and the first end of the inductor L3. The second end of the inductor L3 is connected to the first end of the capacitor C7 and the first end of the inductor L4. The second end of the capacitor C3, the second end of the capacitor C6, and the second end of the capacitor C7 are grounded. The second end of the inductor L4 is connected to the TX pin of the microprocessor controller chip U1 via the capacitor C11.

4. A portable 5T equipment intelligent tracking system performance detector according to claim 3, characterized in that: The signal processing circuit also includes an inductor L5, a capacitor C16 and a capacitor C17. The J3 pin of the low-noise amplifier chip U2 is connected to the first end of the capacitor C16, the second end of the capacitor C16 is connected to the first end of the inductor L5, the second end of the inductor L5 is grounded via the capacitor C17, the RXP pin of the microprocessor controller chip U1 is connected to the first end of the inductor L5, and the RXN pin of the microprocessor controller chip U1 is connected to the second end of the inductor L5.

5. A portable 5T equipment intelligent tracking system performance detector according to claim 4, characterized in that: The VDD pin of the microprocessor controller chip U1 is connected to the first end of the capacitor C12 and the first end of the resistor R3. Capacitors C8, C9 and C10 are connected in parallel at both ends of the capacitor C12. The first end of the capacitor C12 is connected to the first power supply, the second end of the capacitor C12 is grounded, and the second end of the resistor R3 is connected to the TX pin of the microprocessor controller chip U1 via the inductor L6.

6. A portable 5T equipment intelligent tracking system performance detector according to claim 5, characterized in that: The IN pin of the low noise amplifier chip U2 is connected to the second end of the capacitor C1, the VC1 pin of the low noise amplifier chip U2 is connected to the resistor R1, the VC2 pin of the low noise amplifier chip U2 is connected to the resistor R2, and the GND pin of the low noise amplifier chip U2 is grounded.

7. A portable 5T equipment intelligent tracking system performance detector according to claim 6, characterized in that: A crystal oscillator Y1 is connected between the XIN pin of the microprocessor controller chip U1 and the XOUT pin of the microprocessor controller chip U1, a VR_DIG pin of the microprocessor controller chip U1 is connected to the first end of capacitor C14 and the first end of capacitor C15, a second end of capacitor C14 and a second end of capacitor C15 are grounded, a pin VDDDIG of the microprocessor controller chip U1 is connected to the first end of capacitor C13 and the second power supply, and a second end of capacitor C13 is grounded.

8. A portable 5T equipment intelligent tracking system performance detector according to any one of claims 1-7, characterized in that: The ranging module also includes an electrical connector J1 and an electrical connector J2. The XDA pin of the gyroscope chip U3 is connected to pin 1 of the electrical connector J1, the XCL pin of the gyroscope chip U3 is connected to pin 2 of the electrical connector J1, the INT pin of the gyroscope chip U3 is connected to pin 4 of the electrical connector J1, and the pin of the electrical connector J1 is grounded via a resistor R6; the SCL pin of the gyroscope chip U3 is connected to pin 3 of the electrical connector J2, the SDA pin of the gyroscope chip U3 is connected to pin 4 of the electrical connector J2, pin 1 of the electrical connector J2 is connected to the sixth power supply, and pin 2 of the electrical connector J2 is grounded.

9. A portable 5T equipment intelligent tracking system performance detector according to claim 8, characterized in that: The ranging module also includes an LDO regulator chip U4, a VIN pin of the LDO regulator chip U4 is connected to the first end of the capacitor C3 and the seventh power supply, a GND pin of the LDO regulator chip U4 is grounded, an EN pin of the LDO regulator chip U4 is connected to the first end of the capacitor C3, a VOUT pin of the LDO regulator chip U4 is connected to the first end of the capacitor C10, capacitors C12 and C10 are connected in parallel, a second end of the capacitor C10 is grounded, a first end of the capacitor C10 is connected to the eighth power supply and a first end of a resistor R201, a second end of the resistor R201 is connected to the positive electrode of the light-emitting diode D1, and a negative electrode of the light-emitting diode D1 is grounded.

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