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

Abstract

The invention discloses a multichannel digital TR assembly receiving phase consistency test system and method, a switch matrix is used for dividing single-tone signals sent by a vector network analyzer into first analog signals and second analog signals, and the first analog signals are sent to each channel of a digital TR assembly; 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 the first baseband signal to digital signal processing equipment; the digital signal processing device converts the second analog signal into a second baseband signal, and transmits the first baseband signal and the second baseband signal to the automatic test device; and the automatic test equipment performs a receiving phase consistency test of the digital TR assembly according to the first baseband signal and the second baseband signal. A reference signal sent by a vector network analyzer is digitally converted into a digital signal, and the digital signal and a digital signal output by a TR assembly are subjected to a receiving phase consistency test.

Description

Technical Field

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

[0002] The input and output signals of the existing traditional test object TR components are RF analog signals, and the industry measuring instruments are analog signal tests. During the test, the input and output ports are both analog signals, and the vector network analyzer can perform the test normally. In the process of receiving phase consistency test, the phase consistency calculation is often performed based on the value of a certain channel as the reference value. However, with the development of digital devices, the existing TR components are gradually transformed into digital TR components. For digital TR components, when the input is an RF analog signal, its output is a digital signal. However, when calculating, there are analog signals and digital signals that cannot be directly calculated. Therefore, how to perform receiving phase consistency test on digital TR components is a problem that needs to be solved. 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 with 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 the 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 enable end of the mode selection switch is respectively connected to the DA end and the AD end of the digital signal processing device, and the output end of the channel selection switch enables 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 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 RF port of the digital TR component.

[0012] In some specific implementations, the power splitter is used to power 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 test mode of the current 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 test mode of the current 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, send a port switching instruction for switching the test channel and the test interface to the switch matrix, so that a radio frequency port in a channel of the digital TR component is connected to the vector network analyzer;

[0019] S3, receiving the first baseband signal and the second baseband signal transparently transmitted by the digital signal processing device, wherein the first baseband signal is the output signal corresponding to the currently turned-on RF port, and the second baseband signal is the 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 the 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 receiving phase consistency test result of the RF port currently turned on by 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 the prior art, the receiving phase consistency test of the TR component is generally performed by testing the phase of the TR component channel to be tested through a vector network analyzer, and the test results are transmitted back to the mobile terminal for phase consistency test. However, the vector network analyzer generally sends RF analog signals. With the digitization of the TR component, the digital TR component outputs a baseband digital signal. The vector network analyzer cannot directly process the baseband digital signal. In order to achieve automated testing and the number of vector network analyzers used, one vector network analyzer is generally used, and only one test channel of the TR component is connected each time. When performing the receiving phase consistency test, the phase of other channels cannot be used as a reference for testing.

[0035] The present 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 transparently transmitted to the automatic test software through the digital signal processing device for receiving phase consistency test. 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 A 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 A flow chart of a receiving phase consistency test method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0039] The following will be combined with the 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 by no means 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 creative work are within the scope of protection of the present invention.

[0040] 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 unless specifically stated otherwise.

[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.One of ordinary skill in the art will recognize that various changes and modifications may be made to the examples described herein without departing from the spirit and scope of the present disclosure.

[0043] Technologies, methods, and apparatus known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, such technologies, methods, and apparatus 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 as 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, wherein the digital TR component is connected to the digital signal processing device through high-speed digital optical fiber communication; the switch matrix includes a power divider 6, a mode selection switch 7, a channel selection switch 1 and interface selection switches 2, 3, 4, and 5 corresponding to each channel, wherein the input end of the power divider 6 is connected to the signal output end P1 of the vector network analyzer, and the output end is respectively connected to the input end of the mode selection switch 7 and the channel selection switch 1, the selection end of the mode selection switch 7 is respectively connected to the DA end and the AD end of the digital signal processing device, and the output end of the channel selection switches 2 to 5 selects the test channel of the digital TR component. 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.

[0047] Specifically, 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 the 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 power 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 test mode of the current 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, and a single-tone signal with a frequency of F0 and a power of P0 is output from the output port P1. Then, the single-tone signal is split into two signals, namely a first analog signal and a second analog signal, through the power divider 6. The second analog signal is selected to be output to the receiving reference channel (R) or the transmitting reference channel (L) through the mode selection switch 7. When the system is configured to receive the phase consistency test, the mode selection switch 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 through the receiving reference channel (R). Since the digital TR component has multiple channels, the four-channel digital TR component is taken as an example in this embodiment. Therefore, the channel selection switch 1 is a single-pole four-throw switch corresponding to the number of channels of the digital TR component. When testing, the channel selection switch can be controlled to switch to each channel in turn. Each channel of the digital TR component corresponds to multiple RF ports. Therefore, an interface selection switch is also required to be set to transmit the first analog signal to each RF port of each channel in turn 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 8 RF ports connected to the digital TR component.

[0057] The first analog signal is processed by the digital TR component to obtain the first baseband IQ signal, which is transmitted to the digital signal processing device through a high-speed digital optical fiber. After the digital signal processing device receives the second analog signal from the receiving reference channel, it is synchronously sampled and digitally down-converted inside the digital signal processing device to a second baseband IQ signal, wherein the baseband IQ data is a digital baseband signal after the RF signal is sampled and digitally down-converted, sampling is the digitization of the RF signal, and digital down-conversion is the baseband IQ signal after the digitized RF signal is extracted, filtered, and interpolated. Finally, the digital signal processing device transparently transmits the first baseband IQ signal and the second baseband IQ signal to the automatic test device (an industrial computer is used in this embodiment), and the automatic test software in the industrial computer calls the FFT algorithm, and performs FFT algorithm 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, and 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 a 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 the transmitting phase consistency test system, the first switch 8 can be set to 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, the 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 The switch end of the first switch 8 is connected to the input end of the mode switch 7, the other switch end of the first switch 8 is connected to the switch end of the third switch 10, the switch end of the third switch 10 is respectively connected to the switch end of the fifth switch 12 and the switch end of the sixth switch 13, the switch end of the fifth switch 12 is connected to the switch end of the sixth switch 13, the switch end of the fifth switch 12 is connected to the switch end of the fourth switch 11, and the switch end of the fourth 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) and the P2 port of the vector network analyzer, the switch end of the sixth switch 13 is connected to 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 switch 2-5, and the switch 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 receiving phase consistency test, each switch is operated, 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 the first switching switch 8 is controlled to switch to connect with the power divider 6, the mode switching switch 7 is controlled to switch to the receiving reference channel (R), the second switching switch is controlled to switch to connect with the power divider 6, the seventh switching switch 14 is switched to connect the J1 and J2 ports, the channel switching switch 1 is switched to the interface switching switch 2 corresponding to the first channel, and the interface switching switch 2 is switched to the XS03-XS10 RF port of the digital TR component in turn. The RF signal is split into two paths by the power divider 6, one path is transmitted to the digital signal processing device through the receiving reference channel (R) through the first switching switch 8 and the mode switching switch 7 in turn; the other path is sent to the digital TR component through the second switching switch 9, the seventh switching switch, the channel switching switch 1 and the interface switching switch 2 in turn.

[0060] Example 2

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

[0062] S1. Set the test mode of the current 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, send a port switching instruction for switching the test channel and the test interface to the switch matrix, so that a radio frequency port in a channel of the digital TR component is connected to the vector network analyzer;

[0064] S3, receiving the first baseband signal and the second baseband signal transparently transmitted by the digital signal processing device, wherein the first baseband signal is the output signal corresponding to the currently turned-on RF port, and the second baseband signal is the 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 the 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 receiving phase consistency test result of the RF port currently turned on by 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 only a preferred embodiment of the present invention and does not limit the present invention in any form. According to the technical essence of the present invention, within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope 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 a switch matrix, a digital TR component, a digital signal processing device, and an automatic test device, wherein: 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 the switching of the switch matrix; the second analog signal is sent to the digital signal processing device; 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 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 the 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.

3. The multi-channel digital TR component receiving phase consistency test system according to claim 2, characterized in that: The switch matrix also includes a plurality of 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.

4. The multi-channel digital TR component receiving phase consistency test system according to claim 3 is characterized in that: The power divider is used to divide the single-tone signal sent 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 test mode of the current digital TR component; 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.

5. A multi-channel digital TR component receiving phase consistency test method, characterized in that: The following steps are involved: S1. Set the test mode of the current 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, send a port switching instruction for switching the test channel and the test interface to the switch matrix, so that a radio frequency port in a channel of the digital TR component is connected to the vector network analyzer; S3, receiving the first baseband signal and the second baseband signal transparently transmitted by the digital signal processing device, wherein the first baseband signal is the output signal corresponding to the currently turned-on RF port, and the second baseband signal is the 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 the 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 receiving phase consistency test result of the RF port currently turned on by the digital TR component; S6. Repeat steps S2-S5 until the test of all RF ports of the digital TR component is completed.

6. The multi-channel digital TR component receiving phase consistency test method according to claim 4, 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.

7. The multi-channel digital TR component receiving phase consistency test method according to claim 6, 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.

8. 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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