Channel selection device suitable for dual-mode test system

Abstract

The invention belongs to the technical field of power dual-mode communication detection, and discloses a channel selection device suitable for a dual-mode test system. Comprising a peripheral equipment unit, a signal attenuation unit and a channel selection unit, the peripheral equipment unit comprises HPLC standard equipment, a signal source, a first spectrum analyzer, HRF standard equipment, a first vector signal source, a second vector signal source, a second spectrum analyzer and an EVM analyzer; the signal attenuation unit comprises a first programmable attenuator and a second programmable attenuator; the channel selection unit comprises a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a fourth radio frequency switch, a first HPLC power divider, a second HPLC power divider, a first HRF power divider, a second HRF power divider and a third HRF power divider; channel switching and testing of the dual-mode module are achieved through the multiple radio frequency switches and the power dividers, the testing process is simplified, and the testing efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power dual-mode communication detection, and in particular relates to a channel selection device suitable for a dual-mode test system. Background Art

[0002] At present, the dual-mode communication of power communication technology applications usually adopts HPLC+HRF technology, which is the most critical technology in the field of low-voltage power grids. Among them, HRF has an operating frequency range of 470M-510MHz and adopts OFDM technology. Compared with HPLC single-mode technology, it has better anti-interference ability and communication rate, which can meet the requirements of new power system business scenarios for larger communication bandwidth, higher rate and higher reliability, and lay the foundation for integrated distribution, digitization and intelligence.

[0003] However, the existing HPLC+HRF dual-mode equipment testing requires many instruments, complex connections, and cumbersome testing processes. Therefore, high-efficiency testing is often impossible to achieve. In order to facilitate the performance testing of carrier and wireless equipment, it is necessary to propose a channel selection device suitable for a dual-mode test system based on the signal characteristics of high-speed carrier and high-speed wireless to improve the test efficiency. Summary of the invention

[0004] In order to improve the testing efficiency of HPLC+HRF dual-mode equipment, the present invention overcomes the shortcomings of the prior art and aims to solve the technical problem of providing a channel selection device suitable for a dual-mode testing system to solve the problem of using a large number of instruments and inconvenient channels for control and management during performance testing of dual-mode communication equipment.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a channel selection device suitable for a dual-mode test system, comprising a peripheral device unit, a signal attenuation unit, and a channel selection unit;

[0006] The peripheral device unit includes HPLC standard equipment, a signal source, a first spectrum analyzer, an HRF standard equipment, a first vector signal source, a second vector signal source, a second spectrum analyzer, and an EVM analyzer; the signal attenuation unit includes a first programmable attenuator and a second programmable attenuator; the channel selection unit includes a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a fourth radio frequency switch, a first HPLC power divider, a second HPLC power divider, a first HRF power divider, a second HRF power divider, and a third HRF power divider;

[0007] The output end of the signal source is connected to the input end of the first radio frequency switch, the first output end of the first radio frequency switch is connected to the input end of the HPLC standard device, and the second output end of the first radio frequency switch is connected to the first input end of the first HPLC power divider; the output end of the HPLC standard device is connected to the second input end of the first HPLC power divider through the first programmable attenuator; the first spectrum analyzer is connected to the second input end of the second HPLC power divider through the second radio frequency switch; the output end of the second HPLC power divider is connected to the carrier port of the device to be tested;

[0008] The output end of the HRF standard device is connected to the first input end of the third HRF power divider; the output end of the first vector signal source is connected to the first input end of the first HRF power divider, the output end of the second vector signal source is connected to the second input end of the first HRF power divider through the third RF switch, the output end of the first HRF power divider is connected to the first input end of the fourth RF switch, the second spectrum analyzer is connected to the first input end of the second HRF power divider, the EVM analyzer is connected to the second input end of the second HRF power divider through the second programmable attenuator, the output end of the first HRF power divider is connected to the first input end of the fourth RF switch, the output end of the second HRF power divider is connected to the second input end of the fourth RF switch, the output end of the fourth RF switch is connected to the second input end of the third HRF power divider, and the output end of the third HRF power divider is connected to the wireless port of the device under test.

[0009] The channel selection unit further includes a fifth radio frequency switch, and the output end of the third HRF power divider is divided into multiple paths through the fifth radio frequency switch, and each path is respectively connected to a wireless port of the device to be tested.

[0010] The fifth RF switch is a three-channel selection switch, which includes an input end and three output ends, and the three output ends are respectively used to connect to the wireless ports of the dual-mode single-phase module, the dual-mode three-phase module, and the dual-mode routing module.

[0011] The first RF switch, the second RF switch, the third RF switch and the fourth RF switch are dual-channel selection switches.

[0012] The channel selection device suitable for a dual-mode test system further includes a logic control unit, which is used to control the channel selection of the first radio frequency switch, the second radio frequency switch, the third radio frequency switch, and the fourth radio frequency switch.

[0013] The specific method of the logic control unit controlling the channel selection of the first RF switch, the second RF switch, the third RF switch, and the fourth RF switch is:

[0014] (1) When testing the HPLC frequency deviation resistance of the dual-mode module, the first RF switch is controlled to switch to the first output end to be turned on, and the second RF switch is switched to the channel-fully-off state;

[0015] (2) During the HPLC white noise resistance test, narrowband noise resistance test, and pulse noise resistance test, the first RF switch is controlled to switch to the second output end to be turned on, and the second RF switch is switched to the channel fully closed state;

[0016] (3) During the HPLC communication rate performance test, the first RF switch and the second RF switch are controlled to switch to the channel-fully closed state;

[0017] (4) During the HPLC working frequency band and power spectrum density test, the first RF switch is controlled to switch to the channel fully closed state, and the second RF switch is controlled to switch to the channel conducting state;

[0018] (5) During the HRF maximum input level test, the receiving sensitivity test, and the anti-frequency offset tolerance test, the third RF switch is controlled to switch to the channel closing state, and the fourth RF switch is switched to the first output end to conduct;

[0019] (6) During the HRF adjacent channel interference performance test, the multipath channel performance test, and the blocking interference performance test, the third RF switch is controlled to switch to the channel conduction, and the fourth RF switch is controlled to switch to the first input end conduction;

[0020] (7) During the HRF operating frequency band and power spectrum density test, maximum transmit power test, spurious radiation limit test and transmit spectrum mask test, the third RF switch is switched to the channel off state, and the fourth RF switch is switched to the second input end on state.

[0021] The channel selection device suitable for a dual-mode test system further includes a software control platform, and the logic control unit is connected to the software control platform and is used to receive and execute control instructions sent by the software platform.

[0022] The channel selection device suitable for a dual-mode test system further comprises a logic control unit, and the logic control unit is used to control the attenuation values ​​of the first programmable attenuator and the second programmable attenuator.

[0023] The frequency range of the first HPLC power splitter and the second HPLC power splitter is 0.1-400 MHz, and the frequency range of the first HRF power splitter, the second HRF power splitter and the third HRF power splitter is 0.2-1000 MHz.

[0024] The attenuation ranges of the first programmable attenuator and the second programmable attenuator are 0-127dBm.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention provides a channel selection device suitable for a dual-mode test system. By connecting a peripheral device unit and a device under test through multiple radio frequency switches and power dividers, multiple test channel selection of a dual-mode communication module can be realized without multiple connections, which greatly simplifies the test difficulty. Moreover, the device can be controlled by a software control platform to select a test channel, and the carrier and wireless performance tests of the dual-mode module are automatically completed, which greatly simplifies the test difficulty and solves the problem that a large number of instruments are used in the performance test of the dual-mode communication device and the channels are not easy to control and manage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of a channel selection device applicable to a dual-mode test system proposed in Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of a channel selection device applicable to a dual-mode test system proposed in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0029] In order to make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in combination with specific embodiments and drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Embodiment 1

[0031] like Figure 1 As shown, an embodiment of the present invention provides a channel selection device suitable for a dual-mode test system, including a peripheral device unit, a signal attenuation unit, a channel selection unit, and a logic control unit.

[0032] The peripheral device unit includes HPLC standard equipment, a signal source, a first spectrum analyzer, an HRF standard equipment, a first vector signal source, a second vector signal source, a second spectrum analyzer, and an EVM analyzer; the signal attenuation unit includes a first programmable attenuator and a second programmable attenuator; the channel selection unit includes a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a fourth radio frequency switch, a first HPLC power divider, a second HPLC power divider, a first HRF power divider, a second HRF power divider, and a third HRF power divider;

[0033] The output end of the signal source is connected to the input end of the first radio frequency switch, the first output end of the first radio frequency switch is connected to the input end of the HPLC standard device, and the second output end of the first radio frequency switch is connected to the first input end of the first HPLC power divider; the output end of the HPLC standard device is connected to the second input end of the first HPLC power divider through the first programmable attenuator; the first spectrum analyzer is connected to the second input end of the second HPLC power divider through the second radio frequency switch; the output end of the second HPLC power divider is connected to the carrier port of the device to be tested;

[0034] The output end of the HRF standard device is connected to the first input end of the third HRF power divider; the output end of the first vector signal source is connected to the first input end of the first HRF power divider, the output end of the second vector signal source is connected to the second input end of the first HRF power divider through the third RF switch, the output end of the first HRF power divider is connected to the first input end of the fourth RF switch, the second spectrum analyzer is connected to the first input end of the second HRF power divider, the EVM analyzer is connected to the second input end of the second HRF power divider through the second programmable attenuator, the output end of the first HRF power divider is connected to the first input end of the fourth RF switch, the output end of the second HRF power divider is connected to the second input end of the fourth RF switch, the output end of the fourth RF switch is connected to the second input end of the third HRF power divider, and the output end of the third HRF power divider is connected to the wireless port of the device under test.

[0035] In this embodiment, the peripheral device unit supports 8 signal connections, including a signal source, HPLC standard equipment, a first spectrum analyzer required for carrier performance testing, and a first vector signal source, a second vector signal source, a second spectrum analyzer, an HRF standard device, and an EVM analyzer required for wireless performance testing. Each signal is connected separately, and is respectively connected to a signal attenuation unit and a channel selection unit to ensure that each channel is controllable. The signal source, HPLC standard equipment, HRF standard equipment, the first vector signal source, and the second vector signal source serve as signal output devices. The logic control unit controls each RF switch of the channel selection unit to control the output test signal to the device under test. The first spectrum analyzer, the second spectrum analyzer, and the EVM analyzer serve as signal receiving devices to capture the strength and data of the carrier or wireless signal sent by the device under test, which can be sent to the software platform to obtain the test results.

[0036] Specifically, in this embodiment, the first RF switch, the second RF switch, the third RF switch, and the fourth RF switch are dual-channel selection switches. The main function of each RF switch is to quickly switch between different signal paths to ensure stable signal transmission. The RF switch of this embodiment has characteristics such as low insertion loss in the entire frequency range. In addition to channel one and channel two, the dual-channel selection switch also supports the state where both channels are closed at the same time. In addition, the second RF switch and the third RF switch can also use single-channel selection switches as needed.

[0037] Furthermore, a channel selection device suitable for a dual-mode test system in this embodiment also includes a logic control unit, which is used to control the channel selection of the first RF switch, the second RF switch, the third RF switch, and the fourth RF switch. In this embodiment, the logic control unit is connected to each RF switch in the channel selection unit through GPIO, provides power to the channel selection unit and controls the channel selection state of the RF switch in the channel selection unit. Further, the logic control unit is also used to control the attenuation value of the first programmable attenuator and the second programmable attenuator, which is connected to each signal attenuation unit through UART and a power line, provides power to the signal attenuation unit, and sends commands to complete the attenuation value setting of the programmable attenuator.

[0038] Further, in this embodiment, the frequency range of the first HPLC power splitter and the second HPLC power splitter is 0.1-400MHz, and the frequency range of the first HRF power splitter, the second HRF power splitter and the third HRF power splitter is 0.2-1000MHz. In this embodiment, the first HPLC power splitter, the second HPLC power splitter, the first HRF power splitter, the second HRF power splitter and the third HRF power splitter are used to split one input signal into two outputs or to combine two input signals into one output.

[0039] Furthermore, in this embodiment, the attenuation range of the first programmable attenuator and the second programmable attenuator is 0-127dBm. With the characteristics of precision and stable performance, the first programmable attenuator and the second programmable attenuator are connected to the peripheral device unit and the channel selection unit, and are used to adjust the channel attenuation value by receiving instructions from the logic control unit. During the carrier test, the attenuation value of the first programmable attenuator is increased step by step to reduce the channel signal strength, which is used to test the carrier reception performance test; during the wireless test, the software platform obtains the ChannelPower of the second spectrum analyzer, calculates the attenuation value of the second programmable attenuator and sets it so that the input power of the EVM analyzer is around -25dBm, which is used to test the wireless EVM test.

[0040] The channel selection device suitable for a dual-mode test system further includes a software control platform, and the logic control unit is connected to the software control platform and is used to receive and execute control instructions sent by the software control platform. In addition, the logic control unit is also used to receive the test signals obtained by the first spectrum analyzer, the second spectrum analyzer and the EVM analyzer and send them to the software control platform for analysis and processing.

[0041] The following introduces the seven test channels and test principles of the present invention.

[0042] (1) HPLC test channel 1: Control the first RF switch to switch to the first output end (channel A is turned on), and switch the second RF switch to the channel full-off state; the output signal of the signal source is transmitted to the HPLC standard device via the first RF switch to provide an external clock signal for the HPLC standard device; the HPLC standard device sends a test signal via the first programmable attenuator, the first HPLC power divider, and the second HPLC power divider to the carrier device under test for the dual-mode module HPLC anti-frequency deviation performance test.

[0043] (2) HPLC test channel 2: Control the first RF switch to switch to the second output end (B channel is turned on), and switch the second RF switch to the channel fully closed state. The interference signal output by the signal source is coupled to the test signal sent by the HPLC standard device through the first HPLC power divider; the HPLC standard device sends the test signal through the first programmable attenuator, the first HPLC power divider, and the second HPLC power divider to the carrier device under test; the programmable attenuator 1 adjusts the attenuation value to control the channel attenuation strength from the HPLC standard device to the device under test, which is used for the dual-mode module HPLC anti-white noise performance test, anti-narrowband noise performance test, and anti-pulse noise performance test.

[0044] (3) HPLC test channel 3: The first RF switch is switched to the channel-all-off state, and the second RF switch is switched to the channel-all-off state. The HPLC standard device sends a test signal through the first programmable attenuator, the first HPLC power divider, and the second HPLC power divider to the carrier device under test; the first programmable attenuator adjusts the attenuation value to control the channel attenuation strength from the HPLC standard device to the device under test, which is used for the dual-mode module HPLC anti-attenuation performance test. The HPLC standard device sends a test signal to the device under test, and the device under test transmits the test signal back to the HPLC standard device, which is used for the dual-mode module HPLC communication rate performance test.

[0045] (4) HPLC test channel 4: The first RF switch is switched to the channel fully closed state, and the second RF switch is switched to the channel conduction state (channel A is on). The HPLC standard equipment sends a test signal through the first programmable attenuator, the first HPLC power divider, and the second HPLC power divider to the carrier device under test; the device under test transmits the test signal back through the second HPLC power divider and the second RF switch to the first spectrum analyzer for dual-mode module HPLC working frequency band and power spectrum density test.

[0046] (5) HRF test channel 1: The third RF switch is switched to the channel fully closed state, and the fourth RF switch is switched to the first output end conduction (Channel A is conducted). The HRF standard device sends a test signal through the third HRF power divider to the wireless device under test; the first vector signal source sends a test signal through the first HRF power divider, the fourth RF switch, and the third HRF power divider 3 to the wireless port of the device under test, which is used for the dual-mode module HRF maximum input level test, receiving sensitivity test, and anti-frequency deviation tolerance test.

[0047] (6) HRF test channel 2: Control the third RF switch to switch to the channel on (Channel A is on), and the fourth RF switch to switch to the first input end on (Channel A is on); the HRF standard device sends a test signal, which is transmitted through the third HRF power divider to the wireless port of the device under test; the first vector signal source sends a test signal, which is transmitted through the first HRF power divider, the fourth RF switch, and the third HRF power divider to the wireless port of the device under test; the interference signal sent by the second vector signal source is coupled to the test signal sent by the first vector signal source through the first HRF power divider, and is used for the HRF adjacent channel interference performance test, multipath channel performance test, and blocking interference performance test of the dual-mode module.

[0048] (7) HRF test channel 3: The third RF switch is switched to the channel off state, and the fourth RF switch is switched to the second input end on (B channel is on); the HRF standard device sends a test signal through the third HRF power divider to the wireless port of the device under test; the device under test transmits the test signal back through the third HRF power divider, the fourth RF switch, and the second HRF power divider 2 to the second spectrum analyzer, which is used for the HRF operating frequency band and power spectrum density test, maximum transmit power test, spurious radiation limit test, and transmit spectrum mask test of the dual-mode module. According to the ChannelPower of the second spectrum analyzer, the attenuation value of the second programmable attenuator is calculated and set, and the device under test transmits the test signal back through the third HRF power divider, the fourth RF switch, the second HRF power divider, and the second programmable attenuator to the EVM analyzer for the HRF EVM test of the dual-mode module.

[0049] As can be seen from the above, in this embodiment, the specific method for the logic control unit to control the channel selection of the first RF switch, the second RF switch, the third RF switch, and the fourth RF switch is:

[0050] (1) When testing the HPLC frequency deviation resistance of the dual-mode module, the first RF switch is controlled to switch to the first output end to be turned on, and the second RF switch is switched to the channel-fully-off state;

[0051] (2) During the HPLC white noise resistance test, narrowband noise resistance test, and pulse noise resistance test, the first RF switch is controlled to switch to the second output end to be turned on, and the second RF switch is switched to the channel fully closed state;

[0052] (3) During the HPLC communication rate performance test, the first RF switch and the second RF switch are controlled to switch to the channel-fully closed state;

[0053] (4) During the HPLC working frequency band and power spectrum density test, the first RF switch is controlled to switch to the channel fully closed state, and the second RF switch is controlled to switch to the channel conducting state;

[0054] (5) During the HRF maximum input level test, the receiving sensitivity test, and the anti-frequency offset tolerance test, the third RF switch is controlled to switch to the channel closing state, and the fourth RF switch is switched to the first output end to conduct;

[0055] (6) During the HRF adjacent channel interference performance test, the multipath channel performance test, and the blocking interference performance test, the third RF switch is controlled to switch to the channel conduction, and the fourth RF switch is controlled to switch to the first input end conduction;

[0056] (7) During the HRF operating frequency band and power spectrum density test, maximum transmit power test, spurious radiation limit test and transmit spectrum mask test, the third RF switch is switched to the channel off state, and the fourth RF switch is switched to an input end on state.

[0057] Embodiment 2

[0058] like Figure 2 As shown, embodiment 2 of the present invention provides a channel selection device suitable for a dual-mode test system. Different from embodiment 1, in this embodiment, the channel selection unit also includes a fifth RF switch, and the output end of the third HRF power divider is divided into multiple paths through the fifth RF switch, and each path is respectively connected to a wireless port of the device to be tested.

[0059] Specifically, in this embodiment, the fifth RF switch is a three-channel selection switch, which includes an input end and three output ends. Among the three output ends, channel 1, channel 2 and channel 3 are respectively used to connect the wireless ports of the dual-mode single-phase module, the dual-mode three-phase module, and the dual-mode routing module.

[0060] In this embodiment, the software platform can control the channel selection of the fifth RF switch through the logic control unit, and the wireless port tests of three different dual-mode modules can be completed in sequence without replacing the module during the test.

[0061] In summary, the present invention provides a channel selection device suitable for a dual-mode test system, which can realize multi-channel testing of a dual-mode communication module. Moreover, the test channel can be selected by the software control platform control device to complete the carrier and wireless performance tests of the dual-mode module without multiple connections, which greatly simplifies the test difficulty and solves the problem of using many instruments and inconvenient channel control and management when testing the performance of dual-mode communication equipment.

[0062] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A channel selection device suitable for a dual-mode test system, characterized in that: It includes a peripheral device unit, a signal attenuation unit, and a channel selection unit; The peripheral device unit includes HPLC standard equipment, a signal source, a first spectrum analyzer, an HRF standard equipment, a first vector signal source, a second vector signal source, a second spectrum analyzer, and an EVM analyzer; the signal attenuation unit includes a first programmable attenuator and a second programmable attenuator; the channel selection unit includes a first radio frequency switch, a second radio frequency switch, a third radio frequency switch, a fourth radio frequency switch, a first HPLC power divider, a second HPLC power divider, a first HRF power divider, a second HRF power divider, and a third HRF power divider; The output end of the signal source is connected to the input end of the first radio frequency switch, the first output end of the first radio frequency switch is connected to the input end of the HPLC standard device, and the second output end of the first radio frequency switch is connected to the first input end of the first HPLC power divider; the output end of the HPLC standard device is connected to the second input end of the first HPLC power divider through the first programmable attenuator; the first spectrum analyzer is connected to the second input end of the second HPLC power divider through the second radio frequency switch; the output end of the second HPLC power divider is connected to the carrier port of the device to be tested; The output end of the HRF standard device is connected to the first input end of the third HRF power divider; the output end of the first vector signal source is connected to the first input end of the first HRF power divider, the output end of the second vector signal source is connected to the second input end of the first HRF power divider through the third RF switch, the output end of the first HRF power divider is connected to the first input end of the fourth RF switch, the second spectrum analyzer is connected to the first input end of the second HRF power divider, the EVM analyzer is connected to the second input end of the second HRF power divider through the second programmable attenuator, the output end of the first HRF power divider is connected to the first input end of the fourth RF switch, the output end of the second HRF power divider is connected to the second input end of the fourth RF switch, the output end of the fourth RF switch is connected to the second input end of the third HRF power divider, and the output end of the third HRF power divider is connected to the wireless port of the device under test.

2. A channel selection device suitable for a dual-mode test system according to claim 1, characterized in that: The channel selection unit further includes a fifth radio frequency switch, and the output end of the third HRF power divider is divided into multiple paths through the fifth radio frequency switch, and each path is respectively connected to a wireless port of the device to be tested.

3. A channel selection device suitable for a dual-mode test system according to claim 2, characterized in that: The fifth RF switch is a three-channel selection switch, which includes an input end and three output ends, and the three output ends are respectively used to connect to the wireless ports of the dual-mode single-phase module, the dual-mode three-phase module, and the dual-mode routing module.

4. A channel selection device suitable for a dual-mode test system according to claim 1, characterized in that: The first RF switch, the second RF switch, the third RF switch and the fourth RF switch are dual-channel selection switches.

5. A channel selection device suitable for a dual-mode test system according to claim 1, characterized in that: It also includes a logic control unit, which is used to control the channel selection of the first radio frequency switch, the second radio frequency switch, the third radio frequency switch, and the fourth radio frequency switch.

6. A channel selection device suitable for a dual-mode test system according to claim 5, characterized in that: The specific method of the logic control unit controlling the channel selection of the first RF switch, the second RF switch, the third RF switch, and the fourth RF switch is: (1) When testing the HPLC frequency deviation resistance of the dual-mode module, the first RF switch is controlled to switch to the first output end to be turned on, and the second RF switch is switched to the channel-fully-off state; (2) During the HPLC white noise resistance test, narrowband noise resistance test, and pulse noise resistance test, the first RF switch is controlled to switch to the second output end to be turned on, and the second RF switch is switched to the channel fully closed state; (3) During the HPLC communication rate performance test, the first RF switch and the second RF switch are controlled to switch to the channel-fully closed state; (4) During the HPLC working frequency band and power spectrum density test, the first RF switch is controlled to switch to the channel fully closed state, and the second RF switch is controlled to switch to the channel conducting state; (5) During the HRF maximum input level test, the receiving sensitivity test, and the anti-frequency offset tolerance test, the third RF switch is controlled to switch to the channel closing state, and the fourth RF switch is switched to the first output end to conduct; (6) During the HRF adjacent channel interference performance test, the multipath channel performance test, and the blocking interference performance test, the third RF switch is controlled to switch to the channel conduction, and the fourth RF switch is controlled to switch to the first input end conduction; (7) During the HRF operating frequency band and power spectrum density test, maximum transmit power test, spurious radiation limit test and transmit spectrum mask test, the third RF switch is switched to the channel off state, and the fourth RF switch is switched to the second input end on state.

7. A channel selection device suitable for a dual-mode test system according to claim 5, characterized in that: It also includes a software control platform, and the logic control unit is connected to the software control platform and is used to receive and execute control instructions sent by the software platform.

8. A channel selection device suitable for a dual-mode test system according to claim 1, characterized in that: It also includes a logic control unit, which is used to control the attenuation value of the first programmable attenuator and the second programmable attenuator.

9. A channel selection device suitable for a dual-mode test system according to claim 1, characterized in that: The frequency range of the first HPLC power splitter and the second HPLC power splitter is 0.1-400 MHz, and the frequency range of the first HRF power splitter, the second HRF power splitter and the third HRF power splitter is 0.2-1000 MHz.

10. The channel selection device suitable for a dual-mode test system according to claim 1, characterized in that: The attenuation ranges of the first programmable attenuator and the second programmable attenuator are 0-127dBm.

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