Multi-channel digital TR component receiving phase consistency test system and method

Abstract

The present invention discloses a multi-channel digital TR component receiving phase consistency test system and method. The switch matrix is ​​used to split the single-tone signal emitted by a vector network analyzer into a first analog signal and a second analog signal. The first analog signal is sent to each channel of the digital TR component; the second analog signal is sent to a digital signal processing device; the digital TR component converts the first analog signal into a first baseband signal and outputs it to the digital signal processing device; the digital signal processing device converts the second analog signal into a second baseband signal and transparently transmits the first and second baseband signals to an automatic test device; the automatic test device performs a receiving phase consistency test on the digital TR component based on the first and second baseband signals. The receiving phase consistency test is performed by digitizing a reference signal emitted by the vector network analyzer into a digital signal and then comparing it with the digital signal output by the TR component.

Description

Technical Field

[0001] The present invention relates to the field of automated testing technology, and in particular to a system and method for testing the receiving phase consistency of a multi-channel digital TR component. Background Art

[0002] The input and output signals of conventional TR components are analog RF signals, and industry measurement instruments are designed for analog signal testing. During testing, both the input and output signals are analog, allowing vector network analyzers to perform normal testing. During receive phase consistency testing, phase consistency calculations are often performed using the value of a specific channel as a reference. However, with the advancement of digital devices, existing TR components are gradually becoming digital. For digital TR components, when the input is an analog RF signal, the output is a digital signal. However, the calculations involve both analog and digital signals, which cannot be directly calculated. Therefore, how to perform receive phase consistency testing on digital TR components is a challenge that needs to be addressed. Summary of the Invention

[0003] The purpose of the present invention is to provide a multi-channel digital TR component receiving phase consistency test system and method, by adding a digital signal processing device and digitizing the reference signal sent by the vector network analyzer into a digital signal, and then performing a receiving phase consistency test on the digital signal output by the TR component.

[0004] To achieve the above objectives, this application provides the following solutions:

[0005] On the one hand, the present application provides a multi-channel digital TR component receiving phase consistency test system, including a vector network analyzer, a switch matrix, a digital TR component, a digital signal processing device and an automatic test device, wherein:

[0006] The switch matrix is ​​used to split the single-tone signal sent from the vector network analyzer into a first analog signal and a second analog signal. The first analog signal is sent to each channel of the digital TR component through switching of the switch matrix; the second analog signal is sent to the digital signal processing device;

[0007] The digital TR component is used to convert the first analog signal into a first baseband signal and then output it to the digital signal processing device;

[0008] The digital signal processing device is used to convert the second analog signal into a second baseband signal, and transparently transmit the first baseband signal and the second baseband signal to the automatic test equipment;

[0009] The automatic test equipment is used to perform a receiving phase consistency test of the digital TR component according to the first baseband signal and the second baseband signal.

[0010] In some specific embodiments, the switch matrix includes a power divider, a mode selection switch, and a channel selection switch, wherein the input end of the power divider is connected to the signal output end of the vector network analyzer, and the output end is respectively connected to the input ends of the mode selection switch and the channel selection switch, the selection end of the mode selection switch is respectively connected to the DA end and AD end of the digital signal processing device, and the output end of the channel selection switch selects the test channel of the digital TR component.

[0011] In some specific implementations, the switch matrix further includes a plurality of interface selection switches, the channel selection switch is respectively connected to the input end of each interface selection switch, and the output end of each interface selection switch is respectively connected to the RF port of the digital TR component.

[0012] In some specific embodiments, the power splitter is used to split the single-tone signal emitted by the vector network analyzer into a first analog signal and a second analog signal;

[0013] The mode selection switch is used to output the second analog signal to the AD port of the digital signal processing device according to the current test mode of the digital TR component;

[0014] The channel selection switch is used to select the current test channel of the digital TR component.

[0015] The interface selection switch is used to select the current test interface in the current test channel, and the first analog signal is transmitted to the digital TR component along the selected current test channel and the current test interface.

[0016] In a second aspect, the present application provides a method for testing the receiving phase consistency of a multi-channel digital TR component, comprising the following steps:

[0017] S1. Set the current test mode of the digital TR component to receive phase consistency test and generate control parameters for distribution. The switch matrix, digital TR component and digital signal processing device perform mode configuration according to the control parameters.

[0018] S2. Start the automatic test program and send a port switching instruction for switching the test channel and test interface to the switch matrix, so that one RF port in one channel of the digital TR component is connected to the vector network analyzer;

[0019] S3. Receive a first baseband signal and a second baseband signal transparently transmitted by a digital signal processing device, where the first baseband signal is the output signal corresponding to the currently turned-on RF port, and the second baseband signal is a reference signal sent by the digital signal processing device, and the frequency of the reference signal is the same as the frequency of the output signal of the digital TR component;

[0020] S4. Calling an FFT algorithm to calculate the phase values ​​of the first baseband signal and the second baseband signal to obtain a first phase of the first baseband signal and a second phase of the second baseband signal;

[0021] S5. Calculate the difference between the first phase and the second phase to obtain a receive phase consistency test result of the currently turned-on RF port of the digital TR component;

[0022] S6. Repeat steps S2-S5 until the test of all RF ports of the digital TR component is completed.

[0023] In some specific implementations, the process of obtaining the first baseband signal is:

[0024] Receive the single tone signal sent by the vector network analyzer;

[0025] The switch matrix splits the single-tone signal into a first analog signal and a second analog signal, and sends the first analog signal to the digital TR component along the currently turned-on RF port;

[0026] The first analog signal is digitized by the digital TR component to obtain a first baseband signal;

[0027] The first baseband signal is output to a digital signal processing device.

[0028] In some specific implementations, the specific process of obtaining the second baseband signal is:

[0029] When the automatic test program is turned on, a switch switching instruction for mode selection switching is also sent to the switch matrix, so that the switch matrix sends the second analog signal to the AD port of the digital signal processing device;

[0030] synchronously sampling the second analog signal to obtain sampling data;

[0031] The sampled data is digitally down-converted to obtain a second baseband signal.

[0032] In some specific implementations, the digital down-conversion process includes sequentially performing decimation, filtering, and interpolation processes.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] In existing technology, the receive phase consistency test of TR components typically uses a vector network analyzer to measure the phase of the TR component channel under test and transmit the test results back to the mobile terminal for phase consistency testing. However, vector network analyzers generally transmit RF analog signals. With the digitization of TR components, digital TR components output baseband digital signals, which vector network analyzers cannot directly process. In addition, to achieve automated testing and limit the number of vector network analyzers used, only one vector network analyzer is typically used. Therefore, only one test channel of the TR component is connected at a time, and the phase of other channels cannot be used as a reference for testing during receive phase consistency testing.

[0035] This application adds a digital signal processing device and divides the reference signal emitted by the vector network analyzer into two paths through a switch matrix. One path is sent to the digital signal processing device for digital conversion into a digital signal to obtain a first baseband signal as a reference, and the other path is sent to the RF port currently tested by the digital TR component through the switch matrix. The second baseband signal is output after digital conversion by the TR component, and then the first baseband signal and the second baseband signal are transmitted together through the digital signal processing device to the automatic test software for receiving phase consistency testing. In order to realize automated testing, the switch matrix is ​​used to switch each interface of each channel, thereby realizing automated testing of the RF port of the digital TR component. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of a receiving phase consistency test system provided in an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of an automatic testing system provided by an embodiment of the present invention;

[0038] Figure 3 Flowchart of the receiving phase consistency test method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] Unless otherwise specifically stated, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0041] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0042] Additionally, descriptions of well-known structures, functions, and configurations may be omitted for clarity and conciseness. Those skilled in the art will recognize that various changes and modifications can be made to the examples described herein without departing from the spirit and scope of the present disclosure.

[0043] Technologies, methods and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods and equipment should be considered part of the authorization specification.

[0044] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0045] Example 1

[0046] like Figure 1 As shown, this embodiment provides a multi-channel digital TR component receiving phase consistency test system, including a vector network analyzer, a switch matrix, a digital TR component, a digital signal processing device, and an automatic test device. The digital TR component and the digital signal processing device are connected via high-speed digital optical fiber communication. The switch matrix includes a power splitter 6, a mode selection switch 7, a channel selection switch 1, and interface selection switches 2, 3, 4, and 5 corresponding to each channel. The input end of the power splitter 6 is connected to the signal output terminal P1 of the vector network analyzer, and the output end is connected to the input end of the mode selection switch 7 and the input end of the channel selection switch 1 respectively. The selection end of the mode selection switch 7 is connected to the DA terminal and AD terminal of the digital signal processing device respectively. The output ends of the channel selection switches 2 to 5 select the test channel of the digital TR component. The channel selection switch is connected to the input end of each interface selection switch respectively, and the output end of each interface selection switch is connected to the RF port of the digital TR component respectively.

[0047] Specifically, the switch matrix is ​​used to split the single-tone signal emitted from the vector network analyzer into a first analog signal and a second analog signal. The first analog signal is sent to each channel of the digital TR component through switching of the switch matrix; the second analog signal is sent to the digital signal processing device;

[0048] More specifically, the power splitter is used to split the single-tone signal emitted by the vector network analyzer into a first analog signal and a second analog signal;

[0049] The mode selection switch is used to output the second analog signal to the AD port of the digital signal processing device according to the current test mode of the digital TR component;

[0050] The channel selection switch is used to select the current test channel of the digital TR component.

[0051] The interface selection switch is used to select the current test interface in the current test channel, and the first analog signal is transmitted to the digital TR component along the selected current test channel and the current test interface.

[0052] The digital TR component is used to convert the first analog signal into a first baseband signal and then output it to the digital signal processing device;

[0053] The digital signal processing device is used to convert the second analog signal into a second baseband signal, and transparently transmit the first baseband signal and the second baseband signal to the automatic test equipment;

[0054] The automatic test equipment is used to perform a receiving phase consistency test of the digital TR component according to the first baseband signal and the second baseband signal.

[0055] based on Figure 1 The process is:

[0056] The RF signal output port P1 of the vector network analyzer is connected to the input port of the power divider 6. A single-tone signal with a frequency of F0 and a power of P0 is output from the output port P1. The single-tone signal is then split into two signals, a first analog signal and a second analog signal, by the power divider 6. The second analog signal is output to either the receiving reference channel (R) or the transmitting reference channel (L) via the mode selector 7. When the system is configured for receiving phase consistency testing, the mode selector 7 is switched to the receiving reference channel (R), and the second analog signal is output to the AD port of the digital signal processing device via the receiving reference channel (R). Since the digital TR component has multiple channels, in this embodiment, a four-channel digital TR component is used as an example. Therefore, the channel selector 1 is a single-pole four-throw switch corresponding to the number of channels of the digital TR component. When testing, the channel selector switch can be controlled to switch to each channel in sequence. Each channel of the digital TR component corresponds to multiple RF ports. Therefore, an interface selector switch is also required to transmit the first analog signal to each RF port of each channel in sequence when testing each channel. The number of interface selection switches corresponds to the number of channels. In this embodiment, four interface selection switches 2, 3, 4, and 5 are provided, and each interface selection switch corresponds to eight RF ports connected to the digital TR component.

[0057] After the first analog signal is processed by the digital TR component, a first baseband IQ signal is obtained, which is transmitted to the digital signal processing device via a high-speed digital optical fiber. After the digital signal processing device receives the second analog signal from the receiving reference channel, it undergoes synchronous sampling and digital down-conversion within the digital signal processing device to obtain a second baseband IQ signal. The baseband IQ data is a digital baseband signal obtained by sampling and digital down-conversion of the RF signal. Sampling is the digitization of the RF signal, and digital down-conversion is the baseband IQ signal obtained by extracting, filtering, and interpolating the digitized RF signal. Finally, the digital signal processing device transparently transmits the first baseband IQ signal and the second baseband IQ signal to the automatic test equipment (an industrial computer is used in this embodiment). The automatic test software in the industrial computer calls the FFT algorithm and performs FFT calculations on the first baseband IQ signal and the second baseband IQ signal respectively to obtain the phase PH1 of the corresponding channel interface of the digital TR component and the phase PH0 transmitted through the reference channel. The received phase consistency test result is recorded as: PH1-PH0.

[0058] like Figure 2As shown, this embodiment also provides a multi-channel digital TR component automatic test system, which includes not only the receiving phase test but also other test processes. The switch matrix includes a first switch 8 (in order to achieve compatibility between the receiving phase and transmitting phase consistency test systems, the first switch 8 can be set as a three-terminal switch, so that it can be directly connected to the vector network analyzer when performing the transmitting phase consistency test, and can receive the RF signal sent by the power divider 6 when performing the receiving phase consistency test), a second switch 9, a third switch 10, a fourth switch 11, a fifth switch 12, a sixth switch 13, a seventh switch 14, and an eighth switch 15. Except that the fourth switch 11 adopts a four-to-one switch and the seventh switch 14 adopts a double-pole double-throw switch, the remaining switches adopt single-pole double-throw switches. The two ports P1 and P2 of the vector network analyzer, port P1 is connected to the input end of the power divider 6, the output end of the power divider is connected to the switching end of the first switch 8 and the second switch 9, the switching end of the second switch 9 is connected to the noise source, the switch end of the second switch 9 is connected to the J1 port of the seventh switch 14, and the first switch 15 is connected to the input end of the power divider 6. The switch end of the switching switch 8 is connected to the input end of the mode switching switch 7, the other switching end of the first switching switch 8 is connected to the switching end of the third switching switch 10, the switching end of the third switching switch 10 is respectively connected to the switching end of the fifth switching switch 12 and the switching end of the sixth switching switch 13, the switching end of the fifth switching switch 12 is connected to the switching end of the sixth switching switch 13, the switching end of the fifth switching switch 12 is connected to the switching end of the fourth switching switch 11, and the switching end of the fourth switching switch 11 is respectively connected to the signal source, the first attenuator (connected to the power meter), and the second attenuator (connected to the spectrum analyzer). The switch end of the sixth switch 13 is connected to the P2 port of the vector network analyzer, the J3 port of the seventh switch 14, the J2 port of the seventh switch 14 is connected to the input end of the channel switch 1, and the J4 port is connected to the switch end of the eighth switch 15. The J1-J4 ports of the channel switch 1 are respectively connected to the input ends of the interface switches 2-5, and the switching end of the eighth switch 15 is respectively connected to the RF end of the time-frequency optical transmission device. When different test items are required, it is only necessary to control the corresponding switch action in the switch matrix to switch to the corresponding test link. When performing the receive phase consistency test, each switch is activated, and the signal flow path is shown as the dotted line in the figure. The signal path of the RF signal output from the vector network analyzer is:

[0059] The switching end of first switch 8 is controlled to switch to connection with power splitter 6, mode switch 7 is controlled to switch to the receive reference channel (R), the second switch is controlled to switch to connection with power splitter 6, seventh switch 14 is switched to connect ports J1 and J2, channel switch 1 is switched to interface switch 2 corresponding to the first channel, and interface switch 2 is sequentially switched to RF ports XS03-XS10 of the digital TR assembly. The RF signal is split into two paths by power splitter 6. One path passes through first switch 8 and mode switch 7, and is transmitted to the digital signal processing device via the receive reference channel (R). The other path passes through second switch 9, seventh switch, channel switch 1, and interface switch 2, and is sent to the digital TR assembly.

[0060] Example 2

[0061] like Figure 3 As shown, this embodiment provides a method for testing the receiving phase consistency of a multi-channel digital TR component, including the following steps:

[0062] S1. Set the current test mode of the digital TR component to receive phase consistency test and generate control parameters for distribution. The switch matrix, digital TR component and digital signal processing device perform mode configuration according to the control parameters.

[0063] S2. Start the automatic test program and send a port switching instruction for switching the test channel and test interface to the switch matrix, so that one RF port in one channel of the digital TR component is connected to the vector network analyzer;

[0064] S3. Receive a first baseband signal and a second baseband signal transparently transmitted by a digital signal processing device, where the first baseband signal is the output signal corresponding to the currently turned-on RF port, and the second baseband signal is a reference signal sent by the digital signal processing device, and the frequency of the reference signal is the same as the frequency of the output signal of the digital TR component;

[0065] The process of obtaining the first baseband signal is:

[0066] S311, receiving a single tone signal sent by a vector network analyzer;

[0067] S312: The switch matrix splits the single-tone signal into a first analog signal and a second analog signal, and sends the first analog signal to the digital TR component along the currently turned-on RF port;

[0068] S313: The first analog signal is digitized by the digital TR component to obtain a first baseband signal;

[0069] S314: Output the first baseband signal to a digital signal processing device.

[0070] The specific process of obtaining the second baseband signal is:

[0071] S321, when the automatic test program is turned on, a switch switching instruction for mode selection switching is also sent to the switch matrix, so that the switch matrix sends the second analog signal to the AD port of the digital signal processing device;

[0072] S322, synchronously sampling the second analog signal to obtain sampling data;

[0073] S323 , performing digital down-conversion processing on the sampled data to obtain a second baseband signal, wherein the digital down-conversion processing includes sequentially performing decimation, filtering, and interpolation processing.

[0074] S4. Calling an FFT algorithm to calculate the phase values ​​of the first baseband signal and the second baseband signal to obtain a first phase of the first baseband signal and a second phase of the second baseband signal;

[0075] S5. Calculate the difference between the first phase and the second phase to obtain a receive phase consistency test result of the currently turned-on RF port of the digital TR component;

[0076] S6. Repeat steps S2-S5 until the test of all RF ports of the digital TR component is completed.

[0077] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Based on the technical essence of the present invention and within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement of the above embodiment shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A multi-channel digital TR component receiving phase consistency test system, including a vector network analyzer, characterized in that: It also includes switch matrices, digital TR components, digital signal processing equipment, and automatic test equipment, among which, The switch matrix is ​​used to split the single-tone signal sent from the vector network analyzer into a first analog signal and a second analog signal. The first analog signal is sent to each channel of the digital TR component through switching of the switch matrix; the second analog signal is sent to the digital signal processing device; The switch matrix includes a power splitter, a mode selection switch, and a channel selection switch. The input end of the power splitter is connected to the signal output end of the vector network analyzer, and the output end is connected to the input end of the mode selection switch and the input end of the channel selection switch respectively. The selection end of the mode selection switch is connected to the DA end and the AD end of the digital signal processing device respectively. The output end of the channel selection switch selects the test channel of the digital TR component. The power splitter is used to split the single-tone signal emitted by the vector network analyzer into a first analog signal and a second analog signal; The mode selection switch is used to output the second analog signal to the AD port of the digital signal processing device according to the current test mode of the digital TR component; the second analog signal is output to the receiving reference channel or the transmitting reference channel through the mode selection switch; The channel selection switch is used to select the current test channel of the digital TR component; The interface selection switch is used to select the current test interface in the current test channel, and the first analog signal is transmitted to the digital TR component along the selected current test channel and the current test interface; The digital TR component is used to convert the first analog signal into a first baseband signal and then output it to the digital signal processing device; The digital signal processing device is used to convert the second analog signal into a second baseband signal, and transparently transmit the first baseband signal and the second baseband signal to the automatic test equipment; The automatic test equipment is used to perform a receiving phase consistency test of the digital TR component according to the first baseband signal and the second baseband signal.

2. The multi-channel digital TR component receiving phase consistency test system according to claim 1, characterized in that: The switch matrix also includes several interface selection switches, the channel selection switches are respectively connected to the input end of each interface selection switch, and the output end of each interface selection switch is respectively connected to the radio frequency port of the digital TR component.

3. A multi-channel digital TR component receiving phase consistency test method, characterized in that: The following steps are involved: S1. Set the current test mode of the digital TR component to receive phase consistency test and generate control parameters for distribution. The switch matrix, digital TR component and digital signal processing device perform mode configuration according to the control parameters. S2. Start the automatic test program and send a port switching instruction for switching the test channel and test interface to the switch matrix, so that one RF port in one channel of the digital TR component is connected to the vector network analyzer; S3. Receive a first baseband signal and a second baseband signal transparently transmitted by a digital signal processing device, where the first baseband signal is the output signal corresponding to the currently turned-on RF port, and the second baseband signal is a reference signal sent by the digital signal processing device, and the frequency of the reference signal is the same as the frequency of the output signal of the digital TR component; S4. Calling an FFT algorithm to calculate the phase values ​​of the first baseband signal and the second baseband signal to obtain a first phase of the first baseband signal and a second phase of the second baseband signal; S5. Calculate the difference between the first phase and the second phase to obtain a receive phase consistency test result of the currently turned-on RF port of the digital TR component; S6. Repeat steps S2-S5 until the test of all RF ports of the digital TR component is completed.

4. The multi-channel digital TR component receiving phase consistency test method according to claim 3, characterized in that: The process of obtaining the first baseband signal is: Receive the single tone signal sent by the vector network analyzer; The switch matrix splits the single-tone signal into a first analog signal and a second analog signal, and sends the first analog signal to the digital TR component along the currently turned-on RF port; The first analog signal is digitized by the digital TR component to obtain a first baseband signal; The first baseband signal is output to a digital signal processing device.

5. The multi-channel digital TR component receiving phase consistency test method according to claim 4, characterized in that: The specific process of obtaining the second baseband signal is: When the automatic test program is turned on, a switch switching instruction for mode selection switching is also sent to the switch matrix, so that the switch matrix sends the second analog signal to the AD port of the digital signal processing device; synchronously sampling the second analog signal to obtain sampling data; The sampled data is digitally down-converted to obtain a second baseband signal.

6. The multi-channel digital TR component receiving phase consistency test method according to claim 5, characterized in that: The digital down-conversion process includes decimation, filtering and interpolation in sequence.

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