Multi-channel frequency conversion microwave link measurement circuit, test method and frequency conversion microwave link

Abstract

The application is suitable for the technical field of microwave link measurement, and provides a multi-channel frequency conversion microwave link measurement circuit and a test method. The circuit comprises: an input end of an up-conversion circuit for transmitting an intermediate frequency signal, and an output end connected with an input end of a channel calibration circuit; another input end of the channel calibration circuit as a test transmitting end, a plurality of output ends connected with a plurality of input ends of a receiving selection circuit, and an output end connected with one end of a transceiving power division selection circuit; a plurality of output ends of the receiving selection circuit connected with a plurality of input ends of a down-conversion circuit; a plurality of output ends of the down-conversion circuit as intermediate frequency signal receiving ends; a plurality of ends of the transceiving power division selection circuit connected with a plurality of ends of a radio frequency transceiving circuit; the plurality of ends of the radio frequency transceiving circuit as radio frequency transceiving ends; and one end of the transceiving power division selection circuit as a test output receiving end. The method can use a vector network analyzer without frequency conversion function to test the relative gain and phase of a multi-channel transmitting and receiving frequency conversion microwave circuit.

Description

Technical Field

[0001] The present application belongs to the field of microwave link measurement technology, and in particular relates to a multi-channel variable frequency microwave link measurement circuit and a test method. Background Art

[0002] Multi-channel transmit and receive frequency-converting microwave circuits are widely used. They primarily up-convert an intermediate frequency (IF) input signal through a single channel and split it into several RF output channels, as well as down-convert multiple RF signals to IF signals for output. Multi-transmit channels primarily consist of an up-conversion circuit, a transmit amplifier, and multiple RF transceiver circuits.

[0003] Testing the indicators of frequency-converting microwave circuits usually requires testing the indicators of multiple transmitting channels and multiple receiving channels separately for subsequent calibration. However, since the circuit contains frequency conversion functions, that is, it contains both intermediate frequency and radio frequency circuits, and the intermediate frequency signals and radio frequency signals have different frequencies, they cannot be tested using an ordinary vector network analyzer. Instead, a vector network analyzer with a frequency conversion function must be used, which undoubtedly increases the testing cost. Summary of the Invention

[0004] In order to overcome the problems existing in the related art, the embodiments of the present application provide a multi-channel variable frequency microwave link measurement circuit and test method, which can solve the problem that the relative gain and relative phase tests of multi-channel transmitting and multi-channel receiving variable frequency microwave circuits must be tested using a vector network analyzer with a frequency conversion function, and cannot be tested using a vector network analyzer without a frequency conversion function.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a multi-channel variable frequency microwave link measurement circuit, which is embedded in the working circuit of the variable frequency microwave link and includes an up-conversion circuit, a channel calibration circuit, a reception selection circuit, a down-conversion circuit, a transmit and receive power splitter selection circuit, and a radio frequency transceiver circuit;

[0007] The input end of the up-conversion circuit serves as an intermediate frequency signal transmission port; the output end of the up-conversion circuit is connected to the first input end of the channel calibration circuit;

[0008] The second input terminal of the channel calibration circuit serves as a test transmission port; the first output terminal to the nth output terminal of the channel calibration circuit are connected one-to-one with the first input terminal to the nth input terminal of the receiving selection circuit respectively; the n+1th output terminal of the channel calibration circuit is connected to the first terminal of the transmitting and receiving power splitting selection circuit; the first terminal of the transmitting and receiving power splitting selection circuit is a unidirectional input port; n>2 and is a positive integer; the third input terminal of the channel calibration circuit serves as a TTL control signal input port;

[0009] The first output terminal to the nth output terminal of the receiving selection circuit are connected one-to-one with the first input terminal to the nth input terminal of the down-conversion circuit; the first output terminal to the nth output terminal of the down-conversion circuit serve as n intermediate frequency signal receiving ports respectively;

[0010] The second end to the n+1th end of the transceiver power splitter selection circuit are respectively connected one-to-one with the first end to the nth end of the radio frequency transceiver circuit; the n+1th end to the 2nth end of the radio frequency transceiver circuit serve as n radio frequency transceiver ports respectively; the n+2th end of the transceiver power splitter selection circuit serves as a test output receiving port; the second end to the n+1th end of the transceiver power splitter selection circuit serve as bidirectional input and output ports; and the n+2th end of the transceiver power splitter selection circuit serves as a unidirectional output port.

[0011] In a possible implementation of the first aspect, the channel calibration circuit includes a multiplexing selection circuit, an isolation circuit, and a transmission amplifier;

[0012] The first input end of the multiplexing selection circuit serves as the first input end of the channel calibration circuit; the second input end of the multiplexing selection circuit serves as the second input end of the channel calibration circuit; the first output end of the multiplexing selection circuit is connected to the first input end of the isolation circuit; and the second output end of the multiplexing selection circuit is connected to the input end of the transmitting amplifier;

[0013] The second input terminal of the isolation circuit serves as the third input terminal of the channel calibration circuit; the first output terminal to the nth output terminal of the isolation circuit serve as the first output terminal to the nth output terminal of the channel calibration circuit respectively;

[0014] The output end of the transmitting amplifier serves as the (n+1)th output end of the channel calibration circuit.

[0015] In a possible implementation of the first aspect, the multiplexing selection circuit includes two power splitters and a first single-pole double-set switch;

[0016] The input end of the second power divider serves as the first input end of the multiplexing selection circuit; the output end of the second power divider is connected to the input end of the first single-pole double-set switch; the first output end of the first single-pole double-set switch serves as the first output end of the multiplexing selection circuit; and the second output end of the first single-pole double-set switch serves as the second output end of the multiplexing selection circuit.

[0017] The isolation circuit includes a first attenuator, a second attenuator, ..., an n+1th attenuator, a low noise amplifier and a power control module;

[0018] The input end of the (n+1)th attenuator serves as the first input end of the isolation circuit; the output end of the (n+1)th attenuator is connected to the first input end of the low-noise amplifier; the second input end of the low-noise amplifier is connected to the output end of the power control module; the input end of the power control module serves as the second input end of the isolation circuit; the output end of the low-noise amplifier is connected to the input ends of the first attenuator, the second attenuator, ..., and the nth attenuator, respectively;

[0019] The output end of the first attenuator to the output end of the nth attenuator serve as the first output end to the nth output end of the isolation circuit respectively.

[0020] In a possible implementation of the first aspect, the receiving selection circuit includes a second single-pole double-set switch, a third single-pole double-set switch, ..., and an (n+1)th single-pole double-set switch;

[0021] The input end of the second single-pole double-set switch to the input end of the (n+1)th single-pole double-set switch serve as the first input end to the nth input end of the receiving selection circuit respectively.

[0022] In a possible implementation of the first aspect, the transceiver power division selection circuit includes a transceiver power division multiplexing circuit and a transceiver selection circuit; the transceiver power division multiplexing circuit includes a circulator and a second n power divider; the transceiver selection circuit includes an n+2th single-pole double-position switch, ..., and a 2n+1th single-pole double-position switch;

[0023] The first end of the circulator serves as the first end of the transmit-receive power splitter selection circuit; the second end of the circulator serves as the n+2th end of the transmit-receive power splitter selection circuit; the third end of the circulator is connected to the first end of the second n-power splitter;

[0024] The second end to the (n+1)th end of the second n-th power divider are connected one-to-one with the first end of the (n+2)th single-pole double-position switch to the first end of the (2n+1)th single-pole double-position switch respectively;

[0025] The second end of the (n+2)th single-pole double-set switch and the second end of the (2n+1)th single-pole double-set switch are respectively connected one-to-one to the first input end to the nth input end of the receiving selection circuit;

[0026] The third end of the (n+2)th single-pole double-set switch to the third end of the (2n+1)th single-pole double-set switch serve as the second end to the (n+1)th end of the transmit-receive power division selection circuit respectively.

[0027] In a second aspect, an embodiment of the present application provides a method for testing a multi-channel variable frequency microwave link, using a vector network analyzer to test the multi-channel variable frequency microwave link measurement circuit of the first aspect. The method for testing the multi-channel variable frequency microwave link includes:

[0028] Connect the intermediate frequency signal transmission port to the RF output port of the vector network analyzer, and simultaneously connect n intermediate frequency signal receiving ports to the input ports of the vector network analyzer for testing. Input a TTL control signal to the third input terminal of the control channel calibration circuit. Use the channel calibration circuit to control the signal to enter the down-conversion circuit through the receiving selection circuit and output from the first output terminal to the nth output terminal of the down-conversion circuit to obtain the absolute gain and absolute phase of the frequency conversion of the n channels.

[0029] Connect the RF output port of the vector network analyzer to n RF transceiver ports respectively, and connect the test output receiving port to the input port of the vector network analyzer for testing. The control signal enters the transceiver power splitter selection circuit from the n+1th terminal to the 2nth terminal of the RF transceiver circuit, and is output from the n+2th terminal of the transceiver power splitter selection circuit to obtain the absolute gain and absolute phase of the received RF of the n channels.

[0030] Based on the frequency conversion absolute gain and frequency conversion absolute phase of the n channels and the receiving RF absolute gain and receiving RF absolute phase of the n channels, the relative gain and relative phase of the signal receiving process of the n-channel frequency conversion microwave link are determined.

[0031] In a possible implementation of the second aspect, determining a relative gain and a relative phase of a signal reception process of an n-channel frequency-converted microwave link based on the frequency conversion absolute gain and frequency conversion absolute phase of the n channels and the receive RF absolute gain and receive RF absolute phase of the n channels includes:

[0032] Select one of the n channels as a target channel, determine a total absolute gain of a signal reception process of the target channel of the variable frequency microwave link based on a sum of a frequency conversion absolute gain of the target channel and a receiving radio frequency absolute gain of the target channel, and determine a total absolute phase of a signal reception process of the target channel of the variable frequency microwave link based on a sum of a frequency conversion absolute phase of the target channel and a receiving radio frequency absolute phase of the target channel;

[0033] Similarly, based on the frequency conversion absolute gain of each other channel and the sum of the received RF absolute gain of each other channel, the total absolute gain of the signal reception process of each other channel of the frequency conversion microwave link is determined; and based on the frequency conversion absolute phase of each other channel and the sum of the received RF absolute phase of each other channel, the total absolute phase of the signal reception process of each other channel of the frequency conversion microwave link is determined;

[0034] Determining the relative gains of n channels in the signal reception process of the variable frequency microwave link based on the difference between the total absolute gain of the signal reception process of the target channel and the total absolute gain of the signal reception process of other channels;

[0035] The relative phases of the n channels in the signal receiving process of the frequency conversion microwave link are determined based on the difference between the total absolute phase of the signal receiving process of the target channel and the total absolute phase of the signal receiving process of other channels.

[0036] In a possible implementation of the second aspect, the method for testing a multi-channel variable-frequency microwave link further includes:

[0037] Connect the RF output port of the vector network analyzer to the test transmit port, and simultaneously connect n RF transceiver ports to the input port of the vector network analyzer for testing. Use the channel calibration circuit to control the signal to pass through the transmit / receive power selector circuit into the RF transceiver circuit and output from the first end to the nth end of the RF transceiver circuit to obtain the transmit RF absolute gain and transmit RF absolute phase of the n channels.

[0038] Based on the absolute gains and absolute phases of the transmitted radio frequencies of the n channels, relative gains and relative phases of the signal transmission process of the variable frequency microwave links of the n channels are determined.

[0039] In a possible implementation of the second aspect, determining a relative gain and a relative phase of a signal transmission process of an n-channel variable frequency microwave link based on the transmit RF absolute gain and transmit RF absolute phase of the n-channels includes:

[0040] One of the n channels is selected as a target channel, and the relative gains of the n channels in the signal transmission process of the variable frequency microwave link are determined based on the difference between the transmit RF absolute gain of the target channel and the transmit RF absolute gains of the other channels.

[0041] Based on the difference between the absolute phase of the transmitted radio frequency of the target channel and the absolute phase of the transmitted radio frequency of other channels, the relative phases of the n channels in the signal transmission process of the variable frequency microwave link are determined.

[0042] In a third aspect, the present application provides a variable frequency microwave link, including the multi-channel variable frequency microwave link measurement circuit of the first aspect.

[0043] It can be understood that the beneficial effects of the second to third aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here.

[0044] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0045] In the embodiment of the present application, a measurement circuit including an up-conversion circuit, a channel calibration circuit, a receiving selection circuit, a down-conversion circuit, a transmitting and receiving power division selection circuit, and an RF transceiver circuit is embedded in the working circuit of a variable frequency microwave link. The multi-channel receiving process includes two different frequency signal channels, an RF receiving signal and an intermediate frequency output signal. By designing the measurement circuit to include two channels including an RF transceiver (including a receiving part) and a down-conversion circuit, the final indicators of the multiple transmitting channels can be obtained by calculation after being tested separately using an ordinary vector network analyzer. This solves the problem that the relative gain and relative phase tests of multi-channel transmitting and multi-channel receiving variable frequency microwave circuits must be tested using a vector network analyzer with a frequency conversion function, but cannot be tested using a vector network analyzer without a frequency conversion function, thereby reducing testing costs.

[0046] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0048] Figure 1 This is a structural diagram of a multi-channel variable frequency microwave link measurement circuit provided by an embodiment of the present application;

[0049] Figure 2 This is a schematic diagram of the specific structure of a multi-channel variable frequency microwave link measurement circuit provided by an embodiment of the present application;

[0050] Figure 3 is a structural diagram of a channel calibration circuit provided in one embodiment of the present application;

[0051] Figure 4 This is a schematic diagram of the specific structure and connection relationship of the transmit / receive power division selection circuit and the radio frequency transmit / receive circuit provided in one embodiment of the present application;

[0052] Figure 5 It is a structural diagram of a controller provided in one embodiment of the present application. DETAILED DESCRIPTION

[0053] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0054] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0055] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0056] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0057] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0058] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0059] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0060] Figure 1This is a schematic diagram of the structure of a multi-channel variable frequency microwave link measurement circuit provided by an embodiment of the present application, referring to Figure 1 , the multi-channel variable frequency microwave link measurement circuit is described in detail as follows:

[0061] An embodiment of the present application provides a multi-channel variable frequency microwave link measurement circuit, which is embedded in the working circuit of the variable frequency microwave link, including an up-conversion circuit 100, a channel calibration circuit 200, a receiving selection circuit 300, a down-conversion circuit 400, a transmitting and receiving power division selection circuit 500 and a radio frequency transceiver circuit 600.

[0062] Exemplarily, the entire functional circuit is divided into three parts. The first part of the circuit mainly includes the up-conversion circuit 100 and the channel calibration circuit 200, the second part of the circuit mainly includes the receiving selection circuit 300 and the down-conversion circuit 400, and the third part of the circuit mainly includes the transmitting and receiving power selection circuit 500 and the RF transceiver circuit 600.

[0063] The input end of the up-conversion circuit 100 serves as an intermediate frequency signal transmission port; the output end of the up-conversion circuit 100 is connected to the first input end of the channel calibration circuit 200 .

[0064] The second input terminal of the channel calibration circuit 200 serves as a test transmission port; the first output terminal to the nth output terminal of the channel calibration circuit 200 are respectively connected one-to-one with the first input terminal to the nth input terminal of the receiving selection circuit 300; the n+1th output terminal of the channel calibration circuit 200 is connected to the first terminal of the transmitting and receiving power division selection circuit 500; the first terminal of the transmitting and receiving power division selection circuit 500 is a unidirectional input port; n>2 and is a positive integer; the third input terminal of the channel calibration circuit 200 serves as a TTL control signal input port.

[0065] Exemplarily, the radio frequency signal T_RF is input from the first terminal of the transmit / receive power division selection circuit 500 .

[0066] The first to nth output terminals of the receiving selection circuit 300 are connected one-to-one with the first to nth input terminals of the down-conversion circuit 400; the first to nth output terminals of the down-conversion circuit 400 serve as n intermediate frequency signal receiving ports respectively.

[0067] The second end to the n+1th end of the transceiver power splitter selection circuit 500 are respectively connected one-to-one with the first end to the nth end of the RF transceiver circuit 600; the n+1th end to the 2nth end of the RF transceiver circuit 600 serve as n RF transceiver ports respectively; the n+2th end of the transceiver power splitter selection circuit 500 serves as a test output receiving port; the second end to the n+1th end of the transceiver power splitter selection circuit 500 are bidirectional input and output ports; and the n+2th end of the transceiver power splitter selection circuit 500 is a unidirectional output port.

[0068] Exemplarily, the intermediate frequency signal transmitting port is connected with the radio frequency output port of the vector network analyzer, and the n intermediate frequency signal receiving ports are respectively connected with the input ports of the vector network analyzer for receiving frequency conversion connection test; the radio frequency output port of the vector network analyzer is connected with the n radio frequency transceiving ports, and the test output receiving port is connected with the input port of the vector network analyzer for receiving radio frequency connection test; the radio frequency output port of the vector network analyzer is connected with the test transmitting port, and the n radio frequency transceiving ports are respectively connected with the input ports of the vector network analyzer for transmitting radio frequency connection test.

[0069] The embodiment solves the problem that the relative gain and relative phase of the multi-channel transmitting and multi-channel receiving frequency conversion microwave circuit must be tested by using the vector network analyzer with frequency conversion function, and cannot be tested by using the vector network analyzer without frequency conversion function, and reduces the test cost.

[0070] An embodiment, referring to Figure 2 and Figure 3 The up-conversion circuit 100 is single, and the specific structure and connection relationship of the multi-down-conversion channel, i.e. the channel calibration circuit 200, the receiving selection circuit 300 and the down-conversion circuit 400, are specifically introduced.

[0071] Exemplarily, the channel calibration circuit 200 includes a multiplexing selection circuit 201, an isolation circuit 202 and a transmitting amplifier 203.

[0072] The first input end of the multiplexing selection circuit 201 is the first input end of the channel calibration circuit 200; the second input end of the multiplexing selection circuit 201 is the second input end of the channel calibration circuit 200; the first output end of the multiplexing selection circuit 201 is connected with the first input end of the isolation circuit 202; and the second output end of the multiplexing selection circuit 201 is connected with the input end of the transmitting amplifier 203.

[0073] The second input end of the isolation circuit 202 is the third input end of the channel calibration circuit 200; and the first output end to the n output end of the isolation circuit 202 are respectively the first output end to the n output end of the channel calibration circuit 200.

[0074] Taking n=8 as an example, the first to eighth output terminals of the isolation circuit 202 serve as the first to eighth output terminals of the channel calibration circuit 200, respectively. The first output terminal of the isolation circuit 202 serves as the first output terminal of the channel calibration circuit 200; the second output terminal of the isolation circuit 202 serves as the second output terminal of the channel calibration circuit 200; the third output terminal of the isolation circuit 202 serves as the third output terminal of the channel calibration circuit 200; the fourth output terminal of the isolation circuit 202 serves as the fourth output terminal of the channel calibration circuit 200; the fifth output terminal of the isolation circuit 202 serves as the fifth output terminal of the channel calibration circuit 200; the sixth output terminal of the isolation circuit 202 serves as the sixth output terminal of the channel calibration circuit 200; the seventh output terminal of the isolation circuit 202 serves as the seventh output terminal of the channel calibration circuit 200; and the eighth output terminal of the isolation circuit 202 serves as the eighth output terminal of the channel calibration circuit 200.

[0075] The output terminal of the transmitting amplifier 203 serves as the (n+1)th output terminal of the channel calibration circuit 200 .

[0076] Exemplarily, the multiplexing selection circuit 201 includes two power splitters and a first single-pole dual-position switch SPDT1, such as Figure 3 shown.

[0077] The input end of the second power divider serves as the first input end of the multiplexing selection circuit 201; the output end of the second power divider is connected to the input end of the first single-pole dual-set switch SPDT1; the first output end of the first single-pole dual-set switch SPDT1 serves as the first output end of the multiplexing selection circuit 201; the second output end of the first single-pole dual-set switch SPDT1 serves as the second output end of the multiplexing selection circuit 201.

[0078] The isolation circuit 202 includes a first attenuator, a second attenuator, ..., an (n+1)th attenuator, a first n-power divider, a low noise amplifier, and a power control module.

[0079] The input end of the (n+1)th attenuator serves as the first input end of the isolation circuit 202; the output end of the (n+1)th attenuator is connected to the first input end of the low-noise amplifier; the second input end of the low-noise amplifier is connected to the output end of the power control module; the input end of the power control module serves as the second input end of the isolation circuit 202, i.e., the TTL control signal input port; the output end of the low-noise amplifier is connected to the input end of the first n power divider; the first output end to the nth output end of the first n power divider are respectively connected to the input ends of the first attenuator ATT1, the second attenuator ATT2, ..., and the nth attenuator ATTn;

[0080] The output end of the first attenuator ATT1 to the output end of the n-th attenuator ATTn serve as the first output end to the n-th output end of the isolation circuit 202 , respectively.

[0081] Taking n=8 as an example, the output end of the first attenuator ATT1 to the output end of the eighth attenuator ATT8 serve as the first output end to the eighth output end of the isolation circuit 202, respectively. The output end of the first attenuator ATT1 serves as the first output end of the isolation circuit 202; the output end of the second attenuator ATT2 serves as the second output end of the isolation circuit 202; the output end of the third attenuator ATT3 serves as the third output end of the isolation circuit 202; the output end of the fourth attenuator ATT4 serves as the fourth output end of the isolation circuit 202; the output end of the fifth attenuator ATT5 serves as the fifth output end of the isolation circuit 202; the output end of the sixth attenuator ATT6 serves as the sixth output end of the isolation circuit 202; the output end of the seventh attenuator ATT7 serves as the seventh output end of the isolation circuit 202; and the output end of the input end of the eighth attenuator ATT8 serves as the eighth output end of the isolation circuit 202.

[0082] Exemplarily, the receiving selection circuit 300 includes a second single-pole double-set switch SPDT2, a third single-pole double-set switch SPDT3, ..., and an n+1th single-pole double-set switch SPDTn+1, as shown in FIG. Figure 2 shown.

[0083] The input terminal of the second single-pole double-set switch SPDT2 to the input terminal of the (n+1)th single-pole double-set switch SPDTn+1 serve as the first input terminal to the nth input terminal of the receiving selection circuit 300 .

[0084] Taking n=8 as an example, the input terminal of the second single-pole double-set switch SPDT2 to the input terminal of the ninth single-pole double-set switch serve as the first input terminal to the eighth input terminal of the receiving selection circuit 300, respectively. The input terminal of the second single-pole double-set switch SPDT2 serves as the first input terminal of the receiving selection circuit 300; the input terminal of the third single-pole double-set switch SPDT3 serves as the second input terminal of the receiving selection circuit 300; the input terminal of the fourth single-pole double-set switch SPDT4 serves as the third input terminal of the receiving selection circuit 300; the input terminal of the fifth single-pole double-set switch SPDT5 serves as the fourth input terminal of the receiving selection circuit 300; the input terminal of the sixth single-pole double-set switch SPDT6 serves as the fifth input terminal of the receiving selection circuit 300; the input terminal of the seventh single-pole double-set switch SPDT7 serves as the sixth input terminal of the receiving selection circuit 300; the input terminal of the eighth single-pole double-set switch SPDT8 serves as the seventh input terminal of the receiving selection circuit 300; and the input terminal of the ninth single-pole double-set switch SPDT9 serves as the eighth input terminal of the receiving selection circuit 300.

[0085] The embodiment utilizes the two power dividers to multiplex the output signal of the up-conversion circuit 100 (the input signal of the channel calibration circuit 200) and the input signal of the test transmitting port, only one signal terminal has an input signal at the same time, the first single-pole double-throw switch SPDT1 (Single Pole Double Throw) is utilized to select two branches, i.e. to select the down-conversion channel calibration branch and the normal transmitting branch. The SPDT1 can be selected by external control.

[0086] For example, when n=8, taking the down-conversion channel calibration branch of eight channels as an example: the two power dividers of the first part of the circuit complete the multiplexing function of the transmitting radio frequency signal and the transmitting test input port, only one interface has an input signal at the same time, the first single-pole double-throw switch SPDT1 completes the selection of the normal transmitting channel and the down-conversion receiving calibration channel. The down-conversion calibration channel outputs the signal to the 8-way receiving selection switch SPDT2-SPDT9 after the ninth attenuator ATT9 (the attenuation value can be 20dB), the low-noise amplifier with power control function (the relative gain of the low-noise amplifier is not greater than 10dB, and the reverse isolation is 30dB), the first eight-way power divider, the first attenuator ATT1 to the eighth attenuator ATT8 (the attenuation value of each attenuator can be 10dB).

[0087] The ninth attenuator ATT9 mainly prevents the signal saturation of the down-conversion circuit 400 caused by the too large input signal of the up-conversion circuit 100, and the first attenuator ATT1 to the eighth attenuator ATT8 mainly increases the isolation degree of the power divider output branch. The low-noise amplifier with power control function is linked with the first single-pole double-throw switch SPDT1 and the receiving selection switch (the second single-pole double-throw switch to the ninth single-pole double-throw switch) SPDT2-SPDT9 to realize that the on-off ratio is not less than 100dBc.

[0088] When in the down-conversion calibration state, the TTL level input of the TTL control signal input port is valid, the signals output by the first attenuator ATT1 to the eighth attenuator ATT8 are test calibration signals CAL_R1-CAL_R8, and the SPDT2-SPDT9 are switched to the test state to receive the test calibration signals CAL_R1-CAL_R8; when in the non-down-conversion calibration state, the TTL level input of the TTL control signal input port is invalid, the signals output by the first attenuator ATT1 to the eighth attenuator ATT8 are normal working signals CR1-CR8, and the SPDT2-SPDT9 are switched to the normal receiving state to receive the normal working signals CR1-CR8. Thus, when in the down-conversion calibration state, the intermediate frequency signal transmitting port is connected with the radio frequency output port of the vector network analyzer, and the eight intermediate frequency signal receiving ports are respectively connected with the input ports of the vector network analyzer for test, so that the gain and phase of the eight-channel down-conversion circuit can be tested.

[0089] For an embodiment, see Figure 2 and Figure 4 Here, multiple radio frequency channels are specifically introduced, that is, the specific structure and connection relationship of the transceiver power division selection circuit 500 and the radio frequency transceiver circuit 600.

[0090] Exemplarily, the transmit / receive power division selection circuit 500 includes a transmit / receive power division multiplexing circuit and a transmit / receive selection circuit, as shown in the figure. The transmit / receive power division multiplexing circuit includes a circulator and a second n power divider; the transmit / receive selection circuit includes an n+2th single-pole double-position switch, ..., and a 2n+1th single-pole double-position switch.

[0091] The first end of the circulator serves as the first end of the transmit / receive power splitter selection circuit 500 ; the second end of the circulator serves as the n+2th end of the transmit / receive power splitter selection circuit 500 ; the third end of the circulator is connected to the first end of the second n power splitter.

[0092] The second end to the (n+1)th end of the second n power divider are connected one-to-one with the first end of the (n+2)th single-pole double-set switch to the first end of the (2n+1)th single-pole double-set switch, respectively.

[0093] For example, when n=8, the second end to the ninth end of the second eight-power divider are connected one-to-one with the first end of the tenth single-pole dual-position switch SPDT10 to the first end of the seventeenth single-pole dual-position switch SPDT17, respectively. Figure 4 The second end of the second eight power divider is connected to the first end of the tenth single-pole double-set switch SPDT10; the third end of the second eight power divider is connected to the first end of the eleventh single-pole double-set switch SPDT11; the fourth end of the second eight power divider is connected to the first end of the twelfth single-pole double-set switch SPDT12; the fifth end of the second eight power divider is connected to the first end of the thirteenth single-pole double-set switch SPDT13; the sixth end of the second eight power divider is connected to the first end of the fourteenth single-pole double-set switch SPDT14; the seventh end of the second eight power divider is connected to the first end of the fifteenth single-pole double-set switch SPDT15; the eighth end of the second eight power divider is connected to the first end of the sixteenth single-pole double-set switch SPDT16; and the ninth end of the second eight power divider is connected to the first end of the seventeenth single-pole double-set switch SPDT17.

[0094] The second end of the (n+2)th single-pole double-set switch to the second end of the (2n+1)th single-pole double-set switch are respectively connected one-to-one to the first input end to the nth input end of the receiving selection circuit 300 .

[0095] For example, when n=8, the second end of the tenth single-pole double-set switch SPDT10 through the second end of the seventeenth single-pole double-set switch SPDT17 are respectively connected one-to-one to the first input end through the eighth input end of the receive selection circuit 300. When transmitting an RF signal from the RF transceiver port, the second end of the tenth single-pole double-set switch SPDT10 through the second end of the seventeenth single-pole double-set switch SPDT17 output normal operating signals CR1-CR8, respectively, and the first input end through the eighth input end of the receive selection circuit 300 receive the normal operating signals CR1-CR8.

[0096] The third end of the (n+2)th single-pole double-set switch to the third end of the (2n+1)th single-pole double-set switch serve as the second end to the (n+1)th end of the transmit / receive power division selection circuit 500 .

[0097] For example, when n=8, the third terminal of the tenth single-pole double-set switch SPDT10 through the third terminal of the seventeenth single-pole double-set switch SPDT17 serve as the second terminal through the ninth terminal of the transmit / receive power splitter selection circuit 500. When transmitting an RF signal from the RF transceiver port, the second terminal of the tenth single-pole double-set switch SPDT10 through the second terminal of the seventeenth single-pole double-set switch SPDT17 output the RF signal, and the second terminal through the ninth terminal of the transmit / receive power splitter selection circuit 500 receive the RF signal and output it from the test output receiving port.

[0098] In this embodiment, the RF output port of the vector network analyzer can be connected to n RF transceiver ports respectively, and the test output receiving port can be connected to the input port of the vector network analyzer for testing. The signal passes through the RF transceiver circuit 600, the transceiver selection circuit, and the transceiver power division multiplexing circuit, and is finally output to the input port of the vector network analyzer through the test output receiving port, thereby completing the measurement of multi-channel receive RF gain and phase.

[0099] The RF output port of the vector network analyzer can also be connected to the test transmission port, and n RF transceiver ports can be connected to the input port of the vector network analyzer for testing. The signal passes through the transmitting amplifier 203, the transceiver power division multiplexing circuit, the transceiver selection circuit, and the RF transceiver circuit 600, and is finally output to the input end of the vector network analyzer through the RF transceiver port, thereby completing the measurement of multi-channel transmission RF gain and phase.

[0100] An embodiment of the present application provides a method for testing a multi-channel variable frequency microwave link, which uses a vector network analyzer to test the multi-channel variable frequency microwave link measurement circuit of the above embodiment.

[0101] This embodiment performs a frequency conversion receiving n-channel test and a radio frequency receiving n-channel test. Then, the test method of the multi-channel frequency conversion microwave link includes:

[0102] Connect the intermediate frequency signal transmitting port to the RF output port of the vector network analyzer, and simultaneously connect n intermediate frequency signal receiving ports to the input ports of the vector network analyzer for testing. Control the third input terminal of the channel calibration circuit 200 to input a TTL control signal. The channel calibration circuit 200 controls the signal to pass through the receiving selection circuit 300 and enter the down-conversion circuit 400. The signal is then output from the first output terminal to the nth output terminal of the down-conversion circuit 400, thereby obtaining the absolute frequency conversion gain Gain_IF and the absolute frequency conversion phase Phase_IF of the n channels.

[0103] The RF output port of the vector network analyzer is connected to n RF transceiver ports respectively, and the test output receiving port is connected to the input port of the vector network analyzer for testing. The control signal enters the transceiver power splitter selection circuit 500 from the n+1th terminal to the 2nth terminal of the RF transceiver circuit 600, and is output from the n+2th terminal of the transceiver power splitter selection circuit 500 to obtain the receive RF absolute gain Gain_RF and receive RF absolute phase Phase_RF of the n channels.

[0104] Based on the frequency conversion absolute gain and frequency conversion absolute phase of the n channels and the receiving RF absolute gain and receiving RF absolute phase of the n channels, the relative gain ΔGain and relative phase ΔPhase of the signal receiving process of the n-channel frequency conversion microwave link are determined.

[0105] For example, relative gain ΔGain reflects the difference in gain between different channels. Gain inconsistency can cause signals to be amplified more on some channels and less on others, affecting the system's signal quality and uniformity. By measuring relative gain, channels with gain imbalance can be identified, allowing appropriate calibration or adjustments to ensure consistent gain across all channels.

[0106] Relative phase (ΔPhase) reflects the phase difference between signals in different channels. Phase consistency is crucial for coherent signal combination and processing. Phase inconsistency can lead to signal distortion, increased interference, or degraded system performance. By measuring relative phase, channels with large phase deviations can be identified and necessary calibration or adjustments can be made to ensure signal coherence and system stability.

[0107] Therefore, the channel indicators "relative gain" and "relative phase" obtained from the test play a vital role in evaluating system performance, performing calibration work, optimizing system design and troubleshooting.

[0108] Exemplarily, based on the n-channel variable frequency absolute gain and variable frequency absolute phase, and the n-channel receiving radio frequency absolute gain and receiving radio frequency absolute phase, the relative gain and relative phase of the signal receiving process of the n-channel variable frequency microwave link are determined, comprising:

[0109] One of the n-channels is selected as a target channel, based on the sum of the variable frequency absolute gain of the target channel and the receiving radio frequency absolute gain of the target channel, the total absolute gain of the signal receiving process of the target channel of the variable frequency microwave link is determined, and based on the sum of the variable frequency absolute phase of the target channel and the receiving radio frequency absolute phase of the target channel, the total absolute phase of the signal receiving process of the target channel of the variable frequency microwave link is determined.

[0110] For example, the first channel is selected as the target channel, and the total absolute gain Gain_1 and the total absolute phase Phase_1 of the first channel are respectively represented as:

[0111] Gain_1 = Gain_RF1 + Gain_IF1;

[0112] Phase_1 = Phase_RF1 + Phase_IF1;

[0113] Wherein, Gain_RF1 is the receiving radio frequency absolute gain of the first channel; Gain_IF1 is the variable frequency absolute gain of the first channel; Phase_RF1 is the receiving radio frequency absolute phase of the first channel; and Phase_IF1 is the variable frequency absolute phase of the first channel.

[0114] Similarly, based on the sum of the variable frequency absolute gain of each other channel and the receiving radio frequency absolute gain of each other channel, the total absolute gain of the signal receiving process of each other channel of the variable frequency microwave link is determined, and based on the sum of the variable frequency absolute phase of each other channel and the receiving radio frequency absolute phase of each other channel, the total absolute phase of the signal receiving process of each other channel of the variable frequency microwave link is determined.

[0115] Similarly, the total absolute gain Gain_n and the total absolute phase Phase_n of each other channel are represented with reference to the first channel.

[0116] Gain_n = Gain_RFn + Gain_IFn;

[0117] Phase_n = Phase_RFn + Phase_IFn;

[0118] Gain_RF2-Gain_RF1+Gain_IF2-Gain_IF1

[0119] Based on the difference between the total absolute gain of the signal receiving process of the target channel and the total absolute gain of the signal receiving process of the other channels, the relative gain of the n channels of the signal receiving process of the frequency conversion microwave link is determined.

[0120] For example, the relative gain of the second channel, ΔGain_2, is expressed as:

[0121] ΔGain=Gain_2-Gain_1=(Gain_RF2+Gain_IF2)-(Gain_RF1+Gain_IF1)

[0122] =(Gain_RF2-Gain_RF1)+(Gain_IF2-Gain_IF1)

[0123] =ΔGain_RF(2-1)+ΔGain_IF(2-1)

[0124] The relative gain of the n channel, ΔGain_n, is expressed as:

[0125] ΔGain=Gain_n-Gain_1=(Gain_RFn+Gain_IFn)-(Gain_RF1+Gain_IF1)

[0126] =(Gain_RFn-Gain_RF1)+(Gain_IFn-Gain_IF1)

[0127] =ΔGain_RF(n-1)+ΔGain_IF(n-1)

[0128] Based on the difference between the total absolute phase of the signal receiving process of the target channel and the total absolute phase of the signal receiving process of the other channels, the relative phase of the n channels of the signal receiving process of the frequency conversion microwave link is determined.

[0129] In this embodiment, the absolute gain value and the absolute phase value of the target channel in the eight channels with the same function are measured as the reference, and the absolute gain and the absolute phase of all the eight channels are respectively subtracted from the absolute gain and the absolute phase of the first channel, so as to obtain the relative gain and the relative phase of each channel.

[0130] In one embodiment, since the up-conversion circuit 100 is a single circuit, the inter-channel relative gain and relative phase test can bypass the up-conversion circuit 100 and only test some inter-channel indicators of the transmit RF circuit to perform n-channel RF transmit testing. Therefore, the test method for a multi-channel frequency conversion microwave link further includes:

[0131] Connect the RF output port of the vector network analyzer to the test transmission port, and simultaneously connect n RF transceiver ports to the input port of the vector network analyzer for testing. Use the channel calibration circuit 200 to control the signal to pass through the transceiver power selection circuit 500 into the RF transceiver circuit 600, and output from the first end to the nth end of the RF transceiver circuit 600 to obtain the transmit RF absolute gain and transmit RF absolute phase of the n channels.

[0132] Based on the absolute gains and absolute phases of the transmitted radio frequencies of the n channels, relative gains and relative phases of the signal transmission process of the variable frequency microwave links of the n channels are determined.

[0133] Exemplarily, determining the relative gain and relative phase of a signal transmission process of a frequency-converted microwave link of n channels based on the absolute gain and absolute phase of the transmitted radio frequency of the n channels includes:

[0134] One of the n channels is selected as the target channel, and the relative gains of the n channels in the signal transmission process of the variable frequency microwave link are determined based on the difference between the transmit RF absolute gain of the target channel and the transmit RF absolute gains of other channels.

[0135] For example, if the first channel is used as the target channel, the total absolute gain Gain_1 and total absolute phase Phase_1 of the first channel are expressed as follows:

[0136] Gain_1=Gain_RF1;

[0137] Phase_1 = Phase_RF1;

[0138] Where, Gain_RF1 is the absolute gain of the transmit RF of the first channel; Phase_RF1 is the absolute phase of the transmit RF of the first channel.

[0139] Based on the difference between the absolute phase of the transmitted radio frequency of the target channel and the absolute phase of the transmitted radio frequency of other channels, the relative phases of the n channels in the signal transmission process of the variable frequency microwave link are determined.

[0140] For example, the relative gain ΔGain_2 of the second channel is expressed as:

[0141] ΔGain=Gain_2-Gain_1=Gain_RF2-Gain_RF1

[0142] =ΔGain_RF(2-1)

[0143] The relative gain ΔGain_n of the nth channel is expressed as:

[0144] ΔGain=Gain_n-Gain_1=(Gain_RFn-Gain_RF1)

[0145] =Gain_RFn-Gain_RF1

[0146] =ΔGain_RF(n-1)

[0147] As can be seen, the multi-channel variable frequency microwave link measurement circuit proposed in the present invention is based on a measurement circuit including an up-conversion circuit 100, a channel calibration circuit 200, a receiving selection circuit 300, a down-conversion circuit 400, a transmit / receive power division selection circuit 500, and an RF transceiver circuit 600. The multi-channel receiving process includes two different frequency signal channels: an RF receive signal and an intermediate frequency output signal. By designing the measurement circuit to include two channels, the RF transceiver (including the receiving portion) and the down-conversion circuit 400, and utilizing the principle that the relative gain and relative phase of the entire link between channels can be divided into the sum of the RF relative gain and relative phase and the relative gain and relative phase of the frequency conversion portion, the multi-channel variable frequency microwave link calibration measurement circuit divides the frequency conversion microwave circuit into an RF circuit portion and a frequency conversion circuit portion. These portions can be tested separately using a conventional vector network analyzer, and the final indicators of the multiple transmit channels can be calculated. This solves the problem that the relative gain and relative phase testing of multi-channel transmit and receive variable frequency microwave circuits must be tested using a vector network analyzer with frequency conversion functionality, rather than using a vector network analyzer without frequency conversion functionality, thereby reducing testing costs.

[0148] One embodiment provides a variable frequency microwave link, including the multi-channel variable frequency microwave link measurement circuit as described in the above embodiment.

[0149] The present application also provides a controller, see Figure 5 The controller 700 may include: at least one processor 710 and a memory 720, wherein the memory 720 stores a computer program that can be run on the at least one processor 710, and when the processor 710 executes the computer program, the steps in any of the above method embodiments are implemented.

[0150] For example, the computer program can be divided into one or more modules / units, one or more modules / units are stored in the memory 720 and executed by the processor 710 to complete the present application. One or more modules / units can be a series of computer program segments capable of completing a specific function, which are used to describe the execution process of the computer program in the controller 700.

[0151] Those skilled in the art can understand that, Figure 5 The controller is only an example and does not constitute a limitation on the controller, and can include more or fewer components than illustrated, or combine certain components, or different components, such as input / output devices, network access devices, buses, etc.

[0152] The processor 710 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0153] The memory 720 can be an internal storage unit of the controller, or an external storage device of the controller, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. The memory 720 is used to store computer programs and other programs and data required by the test method. The memory 720 can also be used to temporarily store data that has been output or will be output.

[0154] The bus can be an industry standard architecture (ISA) bus, a peripheral component (PCI) bus, or an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of the present application does not limit to only one bus or one type of bus.

[0155] The rapid intelligent detection method for physical and chemical indicators of hazardous waste provided in the embodiments of the present application can be applied to controllers such as computers, tablet computers, laptops, netbooks, and personal digital assistants (PDAs). The embodiments of the present application do not impose any restrictions on the specific type of controller.

[0156] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0157] The beneficial effects of a manufacturing method refer to the beneficial effects of the self-cleaning method for smoking articles in the above embodiment.

[0158] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A multi-channel variable frequency microwave link measurement circuit, characterized in that: Embedded in the working circuit of the frequency conversion microwave link, it includes up-conversion circuit, channel calibration circuit, receiving selection circuit, down-conversion circuit, transmit and receive power selection circuit and RF transceiver circuit; The input end of the up-conversion circuit serves as an intermediate frequency signal transmission port; the output end of the up-conversion circuit is connected to the first input end of the channel calibration circuit; The second input end of the channel calibration circuit serves as a test transmission port; The first output terminal to the nth output terminal of the channel calibration circuit are respectively connected one-to-one with the first input terminal to the nth input terminal of the receiving selection circuit; the n+1th output terminal of the channel calibration circuit is connected to the first terminal of the transmitting and receiving power splitting selection circuit; the first terminal of the transmitting and receiving power splitting selection circuit is a unidirectional input port; n>2 and is a positive integer; the third input terminal of the channel calibration circuit serves as a TTL control signal input port; The first output end to the nth output end of the receiving selection circuit are connected one-to-one with the first input end to the nth input end of the down-conversion circuit; the first output end to the nth output end of the down-conversion circuit serve as n intermediate frequency signal receiving ports respectively; The second end to the n+1th end of the transceiver power division selection circuit are respectively connected one-to-one with the first end to the nth end of the radio frequency transceiver circuit; the n+1th end to the 2nth end of the radio frequency transceiver circuit serve as n radio frequency transceiver ports respectively; The n+2th terminal of the transmit / receive power division selection circuit serves as a test output receiving port; The second end to the n+1th end of the transmit / receive power division selection circuit are input / output bidirectional ports; The n+2th terminal of the transmitting and receiving power division selection circuit is a unidirectional output port.

2. The multi-channel variable frequency microwave link measurement circuit according to claim 1, wherein: The channel calibration circuit includes a multiplexing selection circuit, an isolation circuit and a transmitting amplifier; The first input end of the multiplexing selection circuit serves as the first input end of the channel calibration circuit; the second input end of the multiplexing selection circuit serves as the second input end of the channel calibration circuit; the first output end of the multiplexing selection circuit is connected to the first input end of the isolation circuit; the second output end of the multiplexing selection circuit is connected to the input end of the transmitting amplifier; The second input end of the isolation circuit serves as the third input end of the channel calibration circuit; the first output end to the nth output end of the isolation circuit serve as the first output end to the nth output end of the channel calibration circuit respectively; The output end of the transmitting amplifier serves as the (n+1)th output end of the channel calibration circuit.

3. The multi-channel variable frequency microwave link measurement circuit according to claim 2, wherein: The multiplexing selection circuit includes two power splitters and a first single-pole double-set switch; The input end of the two power splitters serves as the first input end of the multiplexing selection circuit; the output end of the two power splitters is connected to the input end of the first single-pole double-set switch; the first output end of the first single-pole double-set switch serves as the first output end of the multiplexing selection circuit; and the second output end of the first single-pole double-set switch serves as the second output end of the multiplexing selection circuit; The isolation circuit includes a first attenuator, a second attenuator, ..., an n+1th attenuator, a low noise amplifier and a power control module; The input end of the (n+1)th attenuator serves as the first input end of the isolation circuit; the output end of the (n+1)th attenuator is connected to the first input end of the low-noise amplifier; the second input end of the low-noise amplifier is connected to the output end of the power control module; the input end of the power control module serves as the second input end of the isolation circuit; the output end of the low-noise amplifier is connected to the input ends of the first attenuator, the second attenuator, ..., and the nth attenuator, respectively; The output end of the first attenuator to the output end of the nth attenuator serve as the first output end to the nth output end of the isolation circuit respectively.

4. The multi-channel variable frequency microwave link measurement circuit according to claim 1, wherein: The receiving selection circuit includes a second single-pole double-set switch, a third single-pole double-set switch, ..., and an n+1th single-pole double-set switch; The input end of the second single-pole double-set switch to the input end of the (n+1)th single-pole double-set switch serve as the first input end to the nth input end of the receiving selection circuit respectively.

5. The multi-channel variable frequency microwave link measurement circuit according to claim 1, wherein: The transceiver power division selection circuit includes a transceiver power division multiplexing circuit and a transceiver selection circuit; the transceiver power division multiplexing circuit includes a circulator and a second n power divider; the transceiver selection circuit includes an n+2th single-pole double-position switch, ..., and a 2n+1th single-pole double-position switch; The first end of the circulator serves as the first end of the transmit-receive power splitter selection circuit; the second end of the circulator serves as the n+2th end of the transmit-receive power splitter selection circuit; the third end of the circulator is connected to the first end of the second n power splitter; The second end to the (n+1)th end of the second n power divider are connected one-to-one with the first end of the (n+2)th single-pole double-position switch to the first end of the (2n+1)th single-pole double-position switch respectively; The second end of the (n+2)th single-pole double-set switch and the second end of the (2n+1)th single-pole double-set switch are respectively connected one-to-one to the first input end to the nth input end of the receiving selection circuit; The third end of the (n+2)th single-pole double-set switch to the third end of the (2n+1)th single-pole double-set switch serve as the second end to the (n+1)th end of the transmit-receive power division selection circuit respectively.

6. A method for testing a multi-channel variable frequency microwave link, characterized in that: The multi-channel variable frequency microwave link measurement circuit according to any one of claims 1 to 5 is tested using a vector network analyzer, wherein the multi-channel variable frequency microwave link testing method comprises: Connecting an intermediate frequency signal transmitting port to a radio frequency output port of a vector network analyzer, and simultaneously connecting n intermediate frequency signal receiving ports to input ports of the vector network analyzer for testing, controlling a third input terminal of a channel calibration circuit to input a TTL control signal, using the channel calibration circuit to control the signal to enter a down-conversion circuit through a receiving selection circuit, and output from a first output terminal to an nth output terminal of the down-conversion circuit, thereby obtaining the absolute gain and absolute phase of the frequency conversion of the n channels; Connecting the RF output port of the vector network analyzer to n RF transceiver ports, respectively, and connecting the test output receiving port to the input port of the vector network analyzer for testing, wherein the control signal enters the transceiver power splitter selection circuit from the n+1th terminal to the 2nth terminal of the RF transceiver circuit, and is output from the n+2th terminal of the transceiver power splitter selection circuit, thereby obtaining the absolute gain and absolute phase of the received RF of the n channels; Based on the frequency conversion absolute gain and frequency conversion absolute phase of the n channels and the receiving RF absolute gain and receiving RF absolute phase of the n channels, the relative gain and relative phase of the signal receiving process of the n-channel frequency conversion microwave link are determined.

7. The method for testing a multi-channel frequency-converting microwave link according to claim 6, wherein: The method of determining the relative gain and relative phase of a signal reception process of an n-channel frequency conversion microwave link based on the frequency conversion absolute gain and frequency conversion absolute phase of the n-channels and the receiving RF absolute gain and receiving RF absolute phase of the n-channels includes: Selecting one of the n channels as a target channel, determining a total absolute gain of a signal reception process of the target channel of the variable frequency microwave link based on a sum of a frequency conversion absolute gain of the target channel and a receiving radio frequency absolute gain of the target channel, and determining a total absolute phase of a signal reception process of the target channel of the variable frequency microwave link based on a sum of a frequency conversion absolute phase of the target channel and a receiving radio frequency absolute phase of the target channel; Similarly, based on the frequency conversion absolute gain of each other channel and the sum of the received RF absolute gain of each other channel, the total absolute gain of the signal reception process of each other channel of the frequency conversion microwave link is determined; and based on the frequency conversion absolute phase of each other channel and the sum of the received RF absolute phase of each other channel, the total absolute phase of the signal reception process of each other channel of the frequency conversion microwave link is determined; Determining relative gains of n channels in a signal reception process of a variable frequency microwave link based on a difference between a total absolute gain of a signal reception process of the target channel and a total absolute gain of a signal reception process of other channels; Based on the difference between the total absolute phase of the signal receiving process of the target channel and the total absolute phase of the signal receiving process of other channels, the relative phases of the n channels in the signal receiving process of the variable frequency microwave link are determined.

8. The method for testing a multi-channel frequency-converting microwave link according to claim 6, wherein: The testing method of the multi-channel variable frequency microwave link further includes: Connecting the RF output port of the vector network analyzer to the test transmitting port, and simultaneously connecting n RF transceiver ports to the input ports of the vector network analyzer for testing, using the channel calibration circuit to control the signal to enter the RF transceiver circuit through the transceiver power selection circuit and output from the first end to the nth end of the RF transceiver circuit, thereby obtaining the transmit RF absolute gain and transmit RF absolute phase of the n channels; Based on the absolute gains and absolute phases of the transmitted radio frequencies of the n channels, relative gains and relative phases of the signal transmission process of the variable frequency microwave links of the n channels are determined.

9. The method for testing a multi-channel frequency-converting microwave link according to claim 8, wherein: The determining of the relative gain and relative phase of the signal transmission process of the variable frequency microwave link of the n channels based on the absolute gain and absolute phase of the transmitted radio frequency of the n channels includes: Selecting one of the n channels as a target channel, and determining the relative gains of the n channels in a signal transmission process of the variable frequency microwave link based on a difference between the transmit RF absolute gain of the target channel and the transmit RF absolute gains of the other channels; Based on the difference between the absolute phase of the transmitted radio frequency of the target channel and the absolute phase of the transmitted radio frequency of other channels, the relative phases of the n channels in the signal transmission process of the variable frequency microwave link are determined.

10. A variable frequency microwave link, characterized in that: The method comprises the multi-channel variable frequency microwave link measurement circuit according to any one of claims 1 to 5.

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