A PDT digital cluster radio frequency performance automatic test system
Patent Information
- Application Number
- CN202522437871.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-17
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-11-17
AI Technical Summary
[0002]传统PDT数字集群射频性能测试方法主要依赖人工方式对多台独立仪器分别进行手动操作，手动连接射频转换接头，手动切换测试链路，手动处理测试结果，存在测试效率低、人为误差大和结果一致性差等问题
[0012]本实用新型的有益效果在于：本实用新型通过12V直流供电系统、射频开关控制器、射频开关、衰减器、三端口环路器、三合一合路器和高通滤波器集成可程控自动切换的射频开关网络，解决了需要手动连接射频转换接头、需要手动切换测试链路、通信链路插入损耗大等缺点，可同时完成多台PDT数字集群设备射频性能指标自动化测试，具有测试效率高、测试精度优和操作简单方便的特点。
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Figure CN224909494U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of PDT digital trunking radio frequency performance testing technology, and specifically to an automatic PDT digital trunking radio frequency performance testing system. Background Technology
[0002] Traditional PDT (Digital Trunking) radio frequency performance testing methods mainly rely on manual operation of multiple independent instruments, manual connection of radio frequency converters, manual switching of test links, and manual processing of test results. This results in problems such as low testing efficiency, large human error, and poor result consistency.
[0003] Furthermore, traditional RF switching switches are single-function, only capable of link switching, and do not integrate attenuators, circulators, combiners, or high-pass filters. This separate design suffers from drawbacks such as high insertion loss in the communication link and high VSWR at the RF port. Utility Model Content
[0004] In view of the shortcomings of the existing technology, this utility model aims to provide an automatic testing system for the radio frequency performance of PDT digital trunking.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] An automatic testing system for the radio frequency performance of a PDT digital trunking system includes an A signal generator, a B signal generator, a spectrum analyzer, a comprehensive tester, an RF switch network, an industrial control computer, a PDT digital trunking device, and a reference PDT digital trunking device.
[0007] The A signal generator, B signal generator, spectrum analyzer, integrated tester, PDT digital trunking device, and reference PDT digital trunking device are bidirectionally connected to the RF switch network; the output terminal of the industrial control computer is connected to the input terminals of the A signal generator, B signal generator, spectrum analyzer, integrated tester, RF switch network, PDT digital trunking device, and reference PDT digital trunking device; the A signal generator and B signal generator are used to generate different types of interference signals, and the integrated tester is used to generate useful signals;
[0008] The RF switch network includes a 12V DC power supply system, an RF switch controller, RF switches, attenuators, a three-port looper, a three-in-one combiner, and a high-pass filter; the 12V DC power supply system is used to power the RF switch controller and the RF switches respectively; the RF switches include multiple single-pole multi-throw switches; the attenuators include 30dB attenuators, 20dB attenuators, and 10dB attenuators;
[0009] Each PDT digital trunking device is connected to a fixed contact of a single-pole multi-throw switch (SPDS) 1, and the common terminal of SPDS 1 is connected to the common terminal of SPDS 2. The three fixed contacts of SPDS 2 are respectively connected to one fixed contact of SPDS 3, a three-in-one combiner, and a 30dB attenuator. The other fixed contact of SPDS 3 is connected to the three-in-one combiner, and the common terminal of SPDS 3 is connected to a comprehensive tester. The three-in-one combiner is connected to both signal generator A and signal generator B. The three fixed contacts of SPDS 4 are respectively connected to one fixed contact of SPDS 5, a high-pass filter, and a three-port loop. The circuit is connected, and the common terminal of single-pole multi-throw switch four is connected to the spectrum analyzer; the common terminal of single-pole multi-throw switch six is connected to the 30dB attenuator, and its two fixed contacts are respectively connected to the common terminal of single-pole multi-throw switch five and the 10dB attenuator; the high-pass filter is connected to another fixed contact of single-pole multi-throw switch five; the three-port looper is also connected to the 10dB attenuator and the 20dB attenuator respectively; the 20dB attenuator is also connected to the reference PDT digital trunking device; the RF switch controller is connected to single-pole multi-throw switch one, single-pole multi-throw switch two, single-pole multi-throw switch three, single-pole multi-throw switch four, single-pole multi-throw switch five and single-pole multi-throw switch six respectively.
[0010] Furthermore, the single-pole multi-throw switch 1 adopts a single-pole six-throw switch, the single-pole multi-throw switch 2 and the single-pole multi-throw switch 4 both adopt single-pole three-throw switches, and the single-pole multi-throw switch 3, the single-pole multi-throw switch 5 and the single-pole multi-throw switch 6 all adopt single-pole double-throw switches.
[0011] Furthermore, the radio frequency switch controller is provided with multiple control relays, which are used to control the corresponding single-pole multi-throw switches.
[0012] The beneficial effects of this utility model are as follows: This utility model integrates a programmable and automatically switchable RF switch network through a 12V DC power supply system, an RF switch controller, an RF switch, an attenuator, a three-port looper, a three-in-one combiner, and a high-pass filter. This solves the shortcomings of needing to manually connect RF conversion connectors, needing to manually switch test links, and having high insertion loss in communication links. It can simultaneously complete automated testing of the RF performance indicators of multiple PDT digital trunking devices, and has the characteristics of high testing efficiency, excellent testing accuracy, and simple and convenient operation. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall connection of the PDT digital trunking radio frequency performance automatic testing system in this embodiment of the present invention;
[0014] Figure 2 This is a schematic diagram showing the specific connection of the radio frequency switch network in an embodiment of this utility model. Detailed Implementation
[0015] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.
[0016] This embodiment provides an automated testing system for the radio frequency performance of PDT digital trunking, such as... Figure 1 As shown, it includes an A signal generator, a B signal generator, a spectrum analyzer, a comprehensive tester, an RF switch network, an industrial control computer, a PDT digital trunking device, and a reference PDT digital trunking device.
[0017] The A signal generator, B signal generator, spectrum analyzer, integrated tester, PDT digital trunking device, and reference PDT digital trunking device are bidirectionally connected to the RF switch network; the output terminal of the industrial control computer is connected to the input terminals of the A signal generator, B signal generator, spectrum analyzer, integrated tester, RF switch network, PDT digital trunking device, and reference PDT digital trunking device.
[0018] In this embodiment, as Figure 2 As shown, the RF switch network includes a 12V DC power supply system, an RF switch controller, RF switches, attenuators, a three-port looper, a three-in-one combiner, and a high-pass filter; the 12V DC power supply system is used to power the RF switch controller and the RF switches respectively; the RF switches include multiple single-pole multi-throw switches; the attenuators include 30dB attenuators, 20dB attenuators, and 10dB attenuators.
[0019] Each PDT digital trunking device is connected to each fixed contact of a single-pole multi-throw switch 100, and the common terminal of single-pole multi-throw switch 100 is connected to the common terminal of single-pole multi-throw switch 200; the three fixed contacts of single-pole multi-throw switch 200 are respectively connected to one fixed contact of single-pole multi-throw switch 300, a three-in-one combiner, and a 30dB attenuator; the other fixed contact of single-pole multi-throw switch 300 is connected to the three-in-one combiner, the common terminal of single-pole multi-throw switch 300 is connected to a comprehensive tester, and the three-in-one combiner is respectively connected to the A signal generator and the B signal generator; the three fixed contacts of single-pole multi-throw switch 400 are respectively connected to one fixed contact of single-pole multi-throw switch 500, a high-voltage attenuator, and a high-voltage attenuator. A high-pass filter and a three-port looper are connected, and the common terminal of single-pole multi-throw switch four 400 is connected to the spectrum analyzer; the common terminal of single-pole multi-throw switch six 600 is connected to the 30dB attenuator, and its two fixed contacts are respectively connected to the common terminal of single-pole multi-throw switch five 500 and the 10dB attenuator; a high-pass filter is connected to another fixed contact of single-pole multi-throw switch five 500; the three-port looper is also connected to the 10dB attenuator and the 20dB attenuator respectively; the 20dB attenuator is also connected to the reference PDT digital trunking device; the RF switch controller is connected to single-pole multi-throw switch one, single-pole multi-throw switch two, single-pole multi-throw switch three, single-pole multi-throw switch four, single-pole multi-throw switch five and single-pole multi-throw switch six respectively.
[0020] In this embodiment, the number of PDT digital trunking devices is six, therefore, the single-pole multi-throw switch 100 is a single-pole six-throw switch. The single-pole multi-throw switch 200 and the single-pole multi-throw switch 400 are both single-pole three-throw switches, and the single-pole multi-throw switch 300, the single-pole multi-throw switch 500, and the single-pole multi-throw switch 600 are all single-pole double-throw switches.
[0021] In this embodiment, the radio frequency switch controller is equipped with 15 control relays, which are used to control the corresponding single-pole multi-throw switches.
[0022] The working principle of the above-mentioned PDT digital trunking radio frequency performance automatic testing system is as follows:
[0023] The industrial control computer controls the A signal generator, B signal generator, and the integrated tester to generate specified signals. Specifically, the A signal generator is used to generate interference signals, specifically an RF modulation signal with a modulation frequency of 400Hz and a modulation frequency offset of 1.5kHz; the B signal generator is used to generate interference signals, specifically a continuous wave signal; and the integrated tester is used to generate useful signals, specifically a pseudo-random sequence signal of at least 511 bits. The A signal generator, the B signal generator, and the integrated tester are used together to measure various RF performance indicators of the PDT digital trunking equipment receiver.
[0024] Furthermore, the spectrum analyzer and the integrated tester, as radio frequency signal measurement and analysis instruments, are used to measure various radio frequency performance indicators of the PDT digital trunking equipment transmitter. The industrial control computer controls the spectrum analyzer and the integrated tester to perform pre-configured measurement tasks and sends instructions to the radio frequency switch controller. The radio frequency switch controller controls the switching connection between the common terminal and the fixed contact of each single-pole multi-throw switch according to the test configuration requirements, realizing dynamic switching of the test communication link and dynamic compensation for test link loss.
[0025] Specifically, the first communication link consists of a single-pole multi-throw switch (SPMS) 100, a single-pole multi-throw switch 200, a 30dB attenuator, a single-pole multi-throw switch 600, a single-pole multi-throw switch 500, and a single-pole multi-throw switch 400. It is responsible for establishing a test link for the radio frequency parameters (occupied bandwidth, transmit rise time, transmit fall time, adjacent channel power ratio, and transient switching adjacent channel power ratio) of the PDT digital trunking equipment. The 30dB attenuator is used to control the transmit signal strength of the PDT digital trunking equipment, optimize impedance matching, and avoid overloading the spectrum analyzer and signal distortion.
[0026] The second communication link consists of a single-pole multi-throw (SPMD) switch 100, a single-pole multi-throw (SPMD) switch 200, a 30dB attenuator, a single-pole multi-throw (SPMD) switch 600, a single-pole multi-throw (SPMD) switch 500, a high-pass filter, and a single-pole multi-throw (SPMD) switch 400. This link is responsible for establishing the RF parameter (transmitter spurious emissions and receiver spurious emissions) test link for the PDT digital trunking equipment. The 30dB attenuator controls the transmitted signal strength of the PDT digital trunking equipment, optimizes impedance matching, and prevents overload and signal distortion of the spectrum analyzer. The high-pass filter filters out the main in-band signal of the PDT digital trunking equipment, thereby improving the dynamic display range of out-of-band signals on the spectrum analyzer and preventing signal distortion.
[0027] The third communication link consists of a single-pole multi-throw switch (SPDMS) 100, a single-pole multi-throw switch 200, a 30dB attenuator, a single-pole multi-throw switch 600, a 10dB attenuator, a 20dB attenuator, and a single-pole multi-throw switch 400. It is responsible for establishing the RF parameter (intermodulation attenuation) test link for the PDT digital trunking equipment. The 10dB and 30dB attenuators control the transmitted signal strength of the PDT digital trunking equipment, optimize impedance matching, and prevent overload and signal distortion of the spectrum analyzer. The 20dB attenuator controls the transmitted signal strength of the reference PDT digital trunking equipment, optimizes impedance matching, and prevents overload and signal distortion of the spectrum analyzer. The three-port looper enables unidirectional transmission of transmitted signals between the PDT digital trunking equipment and the reference PDT digital trunking equipment, preventing reflected signals from interfering with the source equipment.
[0028] The fourth communication link consists of single-pole multi-throw switch 100, single-pole multi-throw switch 200, and single-pole multi-throw switch 300, which is responsible for establishing the test link for the radio frequency parameters (receiver bit error rate under high-level signal input state) of the PDT digital trunking equipment.
[0029] The fifth communication link consists of a single-pole multi-throw switch 100, a single-pole multi-throw switch 200, a single-pole multi-throw switch 300, and a three-in-one combiner. It is responsible for establishing a test link for the radio frequency parameters (transmit power, power tolerance variation, 4FSK modulation frequency offset error, 4FSK transmit bit error rate, frequency error, static sensitivity, intermodulation response suppression, blocking, spurious response suppression, co-channel suppression, and adjacent channel selectivity) of the PDT digital trunking equipment. The function of the three-in-one combiner is to combine the signals from signal generator A, signal generator B, and the integrated tester into a single signal.
[0030] In each test link, the industrial control computer controls each PDT digital trunking device to dynamically switch transmit and receive commands, thereby completing the automatic testing of the PDT digital trunking device's radio frequency parameters (transmit power, power tolerance variation, 4FSK modulation frequency offset error, 4FSK transmit bit error rate, occupied bandwidth, frequency error, transmit rise time, transmit fall time, adjacent channel power ratio, transient switching adjacent channel power ratio, transmitter spurious emissions, intermodulation attenuation, static sensitivity, receiver bit error rate under high-level signal input state, intermodulation response suppression, blocking, spurious response suppression, co-channel suppression, adjacent channel selectivity, and receiver spurious emissions).
[0031] In summary, the system of this embodiment can simultaneously perform automated testing of the radio frequency performance indicators of multiple PDT digital trunking devices, and features high testing efficiency, excellent testing accuracy, and simple and convenient operation.
[0032] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this utility model.
Claims
1. An automatic testing system for the radio frequency performance of a PDT digital trunking system, characterized in that, This includes A signal generator, B signal generator, spectrum analyzer, integrated tester, RF switch network, industrial control computer, PDT digital trunking equipment, and reference PDT digital trunking equipment; The A signal generator, B signal generator, spectrum analyzer, integrated tester, PDT digital trunking device, and reference PDT digital trunking device are bidirectionally connected to the RF switch network; the output terminal of the industrial control computer is connected to the input terminals of the A signal generator, B signal generator, spectrum analyzer, integrated tester, RF switch network, PDT digital trunking device, and reference PDT digital trunking device; the A signal generator and B signal generator are used to generate different types of interference signals, and the integrated tester is used to generate useful signals; The RF switch network includes a 12V DC power supply system, an RF switch controller, RF switches, attenuators, a three-port looper, a three-in-one combiner, and a high-pass filter; the 12V DC power supply system is used to power the RF switch controller and the RF switches respectively; the RF switches include multiple single-pole multi-throw switches; the attenuators include 30dB attenuators, 20dB attenuators, and 10dB attenuators; Each PDT digital trunking device is connected to a fixed contact of a single-pole multi-throw switch (SPDS) 1, and the common terminal of SPDS 1 is connected to the common terminal of SPDS 2. The three fixed contacts of SPDS 2 are respectively connected to one fixed contact of SPDS 3, a three-in-one combiner, and a 30dB attenuator. The other fixed contact of SPDS 3 is connected to the three-in-one combiner, and the common terminal of SPDS 3 is connected to a comprehensive tester. The three-in-one combiner is connected to both signal generator A and signal generator B. The three fixed contacts of SPDS 4 are respectively connected to one fixed contact of SPDS 5, a high-pass filter, and a three-port loop. The circuit is connected, and the common terminal of single-pole multi-throw switch four is connected to the spectrum analyzer; the common terminal of single-pole multi-throw switch six is connected to the 30dB attenuator, and its two fixed contacts are respectively connected to the common terminal of single-pole multi-throw switch five and the 10dB attenuator; the high-pass filter is connected to another fixed contact of single-pole multi-throw switch five; the three-port looper is also connected to the 10dB attenuator and the 20dB attenuator respectively; the 20dB attenuator is also connected to the reference PDT digital trunking device; the RF switch controller is connected to single-pole multi-throw switch one, single-pole multi-throw switch two, single-pole multi-throw switch three, single-pole multi-throw switch four, single-pole multi-throw switch five and single-pole multi-throw switch six respectively.
2. The system according to claim 1, characterized in that, Single-pole multi-throw switch 1 uses a single-pole six-throw switch, single-pole multi-throw switch 2 and single-pole multi-throw switch 4 both use single-pole three-throw switches, and single-pole multi-throw switch 3, single-pole multi-throw switch 5 and single-pole multi-throw switch 6 both use single-pole double-throw switches.
3. The system according to claim 1, characterized in that, The radio frequency switch controller is equipped with multiple control relays, which are used to control the corresponding single-pole multi-throw switches.