Novel wireless image transmission module calibration test device

Abstract

The utility model discloses a novel wireless image transmission module calibration test device, which belongs to the technical field of electronic product test fixtures and comprises a PC (personal computer), one end of the PC is provided with a USB HUB through an electric wire, one end of the USB HUB is provided with a standard ground end module through a serial port, and the other end of the USB HUB is provided with a standard sky end module through a serial port. According to the utility model, the consistency of the wireless image transmission module in the mass production process is ensured through the transmitting power, the received signal strength indication, the frequency offset accurate calibration, the sensitivity and the throughput rate performance evaluation of the tested module, so that the quality and the reliability of wireless image transmission are ensured; the PC accurately controls the tested module to enter a frequent transmitting mode through a serial port and reads the measurement value of the power meter in real time, the transmitting power can be calibrated to a very accurate level, strict communication standard requirements are met, and the PC combines the measurement result of the frequency spectrograph, finely adjusts the output frequency of a voltage-controlled oscillator of the tested module and controls the frequency offset within an extremely small range.

Description

Technical Field

[0001] This utility model belongs to the field of electronic product testing fixture technology, specifically relating to a novel wireless image transmission module calibration and testing device. Background Technology

[0002] With the rapid development of modern technology, wireless communication technology has been widely used in many fields, such as smartphones, tablets, IoT devices, smart home systems, industrial automation control, drones, and vehicle communication systems. The normal operation of these devices depends on high-performance wireless communication modules. The radio frequency parameters of wireless communication modules directly affect key performance indicators such as communication quality, coverage, data transmission rate, and stability. In order to ensure that wireless communication modules can work stably and efficiently in different application scenarios, it is crucial to accurately calibrate these radio frequency parameters and comprehensively evaluate the overall performance of the modules during their research and development and mass production. This urgently requires a high-precision and high-efficiency calibration and testing device specifically designed for wireless communication modules to meet the growing market demand.

[0003] During the research and development or mass production of WIFI or 4G terminal products, it is generally necessary to calibrate the module's transmit power, receive signal strength, and crystal oscillator frequency offset, and to evaluate the product's sensitivity, throughput, and other performance characteristics. Therefore, a new type of wireless image transmission module calibration and testing device is needed to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a novel wireless image transmission module calibration and testing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A novel wireless image transmission module calibration and testing device, comprising a PC, one end of which is connected to a USB HUB via a wire, one end of which is connected to a standard ground terminal module via a serial port, the other end of which is connected to a standard air terminal module via a serial port, one end of the standard ground terminal module and the standard air terminal module being connected to a power divider A, one end of the power divider A being connected to an attenuator A, the other end of the USB HUB being connected to a test fixture via a serial port, one end of the test fixture being connected to a power divider B, one end of the power divider B being connected to an attenuator B, the PC being connected to a switch via a network cable, and one end of the switch being connected to a spectrum analyzer and a power meter via a network cable.

[0006] In a preferred embodiment, attenuator A is equipped with an adjustable attenuator via a feeder line, the adjustable attenuator is equipped with a power divider C via a wire, the power divider C is connected to attenuator B via a wire, the power divider C is connected to a spectrum analyzer via a wire, the power divider C is connected to a power meter via a wire, and the adjustable attenuator is connected to a switch via a network cable.

[0007] In a preferred embodiment, the switch is connected to the spectrum analyzer via a network cable, and the switch is also connected to the power meter via a network cable.

[0008] In a preferred embodiment, a shielding box A is provided on the outside of the standard ground terminal module and the standard sky terminal module.

[0009] In a preferred embodiment, a shielding box B is provided on the outside of the test fixture.

[0010] In a preferred embodiment, the power divider A is connected to a standard ground terminal module via a wire, and the power divider A is also connected to a standard overhead terminal module via a wire.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention enables several key testing functions for the module under test, including transmit power calibration, receive RSSI calibration, frequency offset calibration, sensitivity testing, and transmit frequency offset ACPR testing. Through precise calibration and performance evaluation of these parameters, it ensures that the wireless image transmission module possesses stable transmit power, accurate receive sensitivity, minimal frequency offset, and good spectral characteristics in practical applications, thereby guaranteeing the quality and reliability of wireless communication. During transmit power calibration, the PC precisely controls the module under test to enter constant transmit mode via a serial port and reads the power meter's measurement values ​​in real time, enabling the transmit power to be calibrated to a very precise level to meet stringent communication standard requirements. In frequency offset calibration, the PC, combined with the spectrum analyzer's measurement results, fine-tunes the output frequency of the voltage-controlled oscillator of the module under test, keeping the frequency offset within a very small range and effectively reducing signal distortion and interference.

[0013] This invention places the standard ground terminal module, standard aerial terminal module, and test fixture in separate shielded boxes and connects them via feeders, power dividers, and adjustable attenuators. This effectively isolates electromagnetic interference between the modules. The shielded boxes block external electromagnetic signals from affecting the internal modules and prevent electromagnetic radiation generated by the internal modules from interfering with the outside world. A USB hub enables serial port connections between the PC and multiple modules, simplifying the wiring structure and facilitating equipment management and maintenance. Furthermore, the network cable connections between the switch and the spectrum analyzer and power meter, along with the reasonable wiring connections between the power dividers, attenuators, and other devices, ensure efficient and stable signal transmission. During large-scale wireless image transmission module testing, this efficient connection method saves testing time, improves testing efficiency, and reduces test interruptions or errors caused by connection problems. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the testing device of this utility model;

[0015] Figure 2 This is a schematic diagram of shielding box A of this utility model;

[0016] Figure 3 This is a schematic diagram of the shielding box B of this utility model.

[0017] In the diagram: 1. PC; 2. USB HUB; 3. Standard ground terminal module; 4. Standard sky terminal module; 5. Power divider A; 6. Attenuator A; 7. Test fixture; 8. Power divider B; 9. Attenuator B; 10. Switch; 11. Spectrum analyzer; 12. Power meter; 13. Adjustable attenuator; 14. Power divider C; 15. Shielded box A; 16. Shielded box B. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments.

[0019] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0020] Please see Figure 1-3This utility model provides a novel wireless image transmission module calibration and testing device, including a PC1. One end of the PC1 is connected to a USB HUB2 via a wire. One end of the USB HUB2 is connected to a standard ground terminal module 3 via a serial port. The other end of the USB HUB2 is connected to a standard sky terminal module 4 via a serial port. One end of the standard ground terminal module 3 and the standard sky terminal module 4 is connected to a power divider A5. One end of the power divider A5 is connected to an attenuator A6. The other end of the USB HUB2 is connected to a test fixture 7 via a serial port. One end of the test fixture 7 is connected to a power divider B8. One end of the power divider B8 is connected to an attenuator B9. The PC1 is connected to a switch 10 via a network cable. One end of the switch 10 is connected to a spectrum analyzer 11 and a power meter 12 via a network cable.

[0021] Attenuator A6 is connected to an adjustable attenuator 13 via a feeder. The adjustable attenuator 13 is connected to a power divider C14 via a wire. The power divider C14 is connected to attenuator B9 via a wire. The power divider C14 is connected to spectrum analyzer 11 via a wire. The power divider C14 is connected to power meter 12 via a wire. The adjustable attenuator 13 is connected to switch 10 via a network cable.

[0022] Switch 10 is connected to spectrum analyzer 11 via network cable, and switch 10 is also connected to power meter 12 via network cable.

[0023] The standard ground terminal module 3 and the standard sky terminal module 4 are equipped with a shielding box A15 on their outer sides.

[0024] The test fixture 7 is equipped with a shielding box B16 on its outer side.

[0025] The power divider A5 is connected to the standard ground terminal module 3 via a wire, and the power divider A5 is connected to the standard sky terminal module 4 via a wire.

[0026] Includes the following steps;

[0027] a. Transmission power calibration: PC1 controls the module under test to enter constant transmission mode via serial port, and at the same time reads the current display value of power meter 12, sends serial port command to adjust the transmission power of the board under test until the requirements are met, and writes the current calibration value to complete the transmission power calibration of the module under test.

[0028] b. RSSI calibration: The module under test distinguishes between the sky end and the ground end. When testing the standard sky end module 4, control the standard ground end module 3 to make it emit a standard intensity signal, read the RSSI of the module under test, and write the difference between the standard ground end signal strength and the RSSI of the module under test into the module under test to complete the RSSI calibration.

[0029] c. Frequency deviation calibration: PC1 controls the module under test to emit a single-tone signal, PC1 program reads the frequency of spectrum analyzer 11, adjusts the output frequency of the voltage-controlled oscillator of the module under test until the requirements are met, writes the voltage value into the module under test, and the frequency deviation calibration is completed.

[0030] d. ACPR test: PC1 controls the module under test to enter constant transmission mode via serial port, and spectrum analyzer 11 measures the frequency ACPR value and stores this value in the local computer.

[0031] e. Sensitivity test: The module under test is distinguished between the sky end and the ground end. When testing the standard ground end module 3, control the standard sky end module 4 to establish a link with the module under test, set the lowest modulation mode, and adjust the value of the adjustable attenuator 13 until the LDPC error number appears. Record the current sensitivity value in the local computer to complete the sensitivity test.

[0032] During the wireless link module test, airborne and ground-end programs are pre-installed. In order to better test sensitivity and calibrate RSSI, this device extracts two sets of airborne and two sets of ground-end modules from the mass-produced modules. Using a power meter and signal source, the module's transmit power, RSSI, and frequency offset parameters are calibrated. Then, one airborne and one ground-end module are placed in a shielded box. The airborne and ground-end modules are connected to the outside of the shielded box through a power divider and a fixed attenuator. A standard module is placed in the test fixture to calibrate the attenuation value of the intermediate cable. Then, the standard ground-end module is placed to complete the self-calibration of test fixture 7.

[0033] To improve testing efficiency, a test fixture 7 was developed for the module under test. The board is placed in it, connected to the FPC cable, and the fixture is pressed down to complete the RF signal connection.

[0034] Both the spectrum analyzer 11 and the power meter 12 are connected to the computer via network cable. The software, through the instrument SDK, can control the instruments and complete automated testing.

[0035] The wireless module can be configured via serial port, allowing users to set module frequency, TX VGA, RX VGA, constant transmission, and other functions, and to write calibration values.

[0036] The working principle and usage process of this utility model are as follows: It connects to the standard ground module 3, standard air module 4, and test fixture 7 via USB HUB2 and serial ports. Simultaneously, it connects to the spectrum analyzer 11, power meter 12, and adjustable attenuator 13 via network cable through switch 10 to achieve data exchange. During operation, the standard module calibration parameters are first extracted, and the test fixture 7 itself undergoes calibration. In transmit power calibration, PC1 controls the module under test to transmit continuously, reads the power meter 12 value, adjusts the power to the target level, and then writes the calibration value. RSSI calibration is performed on the air module; PC1 controls the ground module to transmit a signal, calculates the RSSI difference with the module under test, and writes it. Frequency... During partial calibration, PC1 instructs the module under test to emit a single-tone signal, reads the frequency from the spectrum analyzer, adjusts the voltage-controlled oscillator frequency, and writes the voltage value. For ACPR testing, PC1 controls the module under test to emit a constant signal, and PC1 stores the measured value after the spectrum analyzer is activated. For sensitivity testing, during the ground-side module test, PC1 controls the sky-side module to establish a link, set the modulation mode, adjust the attenuator until the LDPC fails, and records the sensitivity value. Throughout the process, the signal is transmitted through a power divider and attenuator, and each module is placed in a shielded box to prevent electromagnetic interference. The instrument measures the parameters to achieve accurate calibration testing of the wireless image transmission module.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel wireless image transmission module calibration testing device comprising a PC (1), characterized in that: One end of the PC (1) is provided with a USB HUB (2) through an electric wire, one end of the USB HUB (2) is provided with a standard ground end module (3) through a serial port, the other end of the USB HUB (2) is provided with a standard sky end module (4) through a serial port, one end of the standard ground end module (3) and the standard sky end module (4) is provided with a power divider A (5), one end of the power divider A (5) is provided with an attenuator A (6), the other end of the USB HUB (2) is provided with a test fixture (7) through a serial port, one end of the test fixture (7) is provided with a power divider B (8), one end of the power divider B (8) is provided with an attenuator B (9), the PC (1) is provided with a switch (10) through a network cable, one end of the switch (10) is provided with a spectrum analyzer (11) and a power meter (12) through a network cable.

2. The novel wireless image transmission module calibration test device according to claim 1, characterized in that: The attenuator A (6) is provided with an adjustable attenuator (13) through a feeder, the adjustable attenuator (13) is provided with a power divider C (14) through an electric wire, the power divider C (14) is connected with the attenuator B (9) through an electric wire, the power divider C (14) is connected with the spectrum analyzer (11) through an electric wire, the power divider C (14) is connected with the power meter (12) through an electric wire, the adjustable attenuator (13) is connected with the switch (10) through a network cable.

3. The novel wireless image transmission module calibration test device according to claim 1, characterized in that: The switch (10) is connected with the spectrum analyzer (11) through a network cable, the switch (10) is connected with the power meter (12) through a network cable.

4. The novel wireless image transmission module calibration test device according to claim 1, characterized in that: The outside of the standard ground end module (3) and the standard sky end module (4) is provided with a shielding box A (15).

5. The novel wireless image transmission module calibration test device according to claim 1, characterized in that: The outside of the test fixture (7) is provided with a shielding box B (16).

6. The novel wireless image transmission module calibration testing device according to claim 1, characterized in that: The power divider A (5) is connected with the standard ground end module (3) through an electric wire, the power divider A (5) is connected with the standard sky end module (4) through an electric wire.

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