Multi-port multi-band intermodulation test method and device

Abstract

The invention provides a multi-port multi-band intermodulation test method and equipment, and the method comprises the following steps: controlling one or more signal sources to respectively generate carrier signals of two different frequency points in respective target frequency bands; combining the carrier signals into a mixed wave signal through a signal cross network, and distributing the mixed wave signal into multiple paths of test signals, so that each path of test signal comprises the mixed wave signal of one frequency band or multiple frequency bands so as to access a signal port of external passive equipment; and polling and collecting reflected signals generated by each path of test signals through a signal collection unit, and generating test data based on the reflected signals. According to the method, intermodulation testing of multiple frequency bands is achieved, multi-frequency-band intermodulation testing can be conducted on multiple external passive devices at the same time, or multi-frequency-band intermodulation testing can be conducted on multiple ports of the external passive devices, and therefore the intermodulation detection efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of mobile communications, and particularly relates to a multi-port multi-band intermodulation test device and an intermodulation test method implemented based on this device. Background Art

[0002] With the rapid development of mobile communication technologies, wireless communication technologies and product forms are constantly updated. Currently, RRU (Remote Radio Unit) has gradually evolved from the original single-mode (such as 700M, 800M, 900M, 1.8G, 2.1G, 2.6G, etc.) to dual-mode (such as 1.8 + 2.1G, 700 + 900M, 800 + 900M, etc.) and then to triple-mode (such as 700M + 800M + 900M and 1.8G + 2.1G + 2.6G). In the field of macro base stations, the mainstream FDD RRU configuration has been upgraded to 4TR (four transmit / receive channels), and correspondingly, antennas have evolved into 4-port or multi-port broadband antennas. For such multi-port broadband antennas, it is necessary to test the passive intermodulation indicators of multiple ports and multiple frequency bands. In addition, 5G Massive MIMO has also evolved from single-mode to multi-mode, such as 1.8G + 2.1G + 2.6G triple-mode, and the antennas have even evolved into triple-band 32-port or even triple-band 64-port. The demand for intermodulation testing of such multi-frequency multi-port antennas and multi-port passive products is increasing day by day.

[0003] However, ordinary intermodulation test devices on the market currently generally only support single-port and dual-port modes, and the operating frequency band only supports single frequency. One intermodulation test device can only test one frequency band. For the intermodulation testing of multi-frequency multi-port antennas and multi-port passive products, it is often necessary to increase the number of intermodulation test devices, and one or more intermodulation devices with different frequency bands are required. This not only increases the equipment procurement cost, but also makes the testing process cumbersome and the testing efficiency low. For example, when testing a triple-band 32-port antenna, if an independent intermodulation test device is required for each frequency band, then at least three devices are needed, with each device testing one frequency band respectively. This not only increases the occupied space of the devices, but also increases the testing time and labor cost.

[0004] To improve the test efficiency, multi-port intermodulation test systems have also been proposed. However, these systems usually use multiple intermodulation devices with the same or different frequency bands to build a test system through a switch matrix. Although this system improves the test efficiency to a certain extent, its complexity and cost problems are still prominent. Specifically, this system not only has a large number of devices, complex cable connections, and high operation difficulty, but also, due to the introduction of a switch matrix and additional connection cables, etc., it not only increases the output power of a single intermodulation instrument, but also easily affects the test accuracy. For example, the switch matrix may introduce additional signal loss and reflection when switching different ports, resulting in inaccurate test results. In addition, the coordinated operation of multiple devices requires a complex control system, increasing the system's failure risk and maintenance cost.

[0005] It can be seen from this that the existing intermodulation test equipment and systems have problems such as low test efficiency, high cost, complex operation, and poor test accuracy when facing the test requirements of multi-frequency multi-port antennas and multi-port passive products. Therefore, there is an urgent need for an intermodulation test device that can simultaneously test multiple ports and multiple frequency bands to meet the growing test requirements of multi-frequency multi-port antennas and multi-port passive products. Summary of the Invention

[0006] The primary object of the present invention is to provide a multi-port multi-band intermodulation test method and device to solve at least one of the above problems.

[0007] To meet the various objects of the present invention, the present invention adopts the following technical solutions:

[0008] To provide a multi-port multi-band intermodulation test method according to one of the objects of the present invention, including the following steps:

[0009] Control one or more signal sources to respectively generate carrier signals at two different frequency points within their respective target frequency bands;

[0010] Combine the carrier signals into a mixed wave signal through a signal cross network and distribute it into multiple test signals, so that each test signal contains a mixed wave signal of one frequency band or multiple frequency bands to access the signal ports of external passive devices;

[0011] Poll and collect the reflected signals generated by each test signal through a signal acquisition unit, and generate test data based on the reflected signals.

[0012] In one embodiment, in the step of controlling one or more signal sources to respectively generate carrier signals at two different frequency points within their respective target frequency bands, the following steps are included:

[0013] Control two signal generators of the signal source corresponding to the target frequency band to work, and the two signal transmitters respectively generate carrier signals at two different frequency points.

[0014] In one embodiment, in the step of controlling one or more signal sources to respectively generate carrier signals at two different frequencies within their respective target frequency bands, the following specific steps are included:

[0015] Receive a test instruction, where the test instruction includes information on one or more target frequency bands corresponding to the intermodulation test;

[0016] Based on the information on the one or more target frequency bands, control the corresponding one or more signal sources to generate corresponding carrier signals.

[0017] In one embodiment, in the step of controlling the corresponding one or more signal sources to generate corresponding carrier signals based on the information on the one or more target frequency bands, the following steps are included:

[0018] When the test instruction includes information on one target frequency band, control one of the signal generators of the signal source corresponding to this target frequency band to fixedly operate at the same frequency point, and the other signal generator continuously changes its operating frequency point.

[0019] In one embodiment, in the step of controlling one of the signal generators of the signal source corresponding to this target frequency band to fixedly operate at the same frequency point and the other signal generator continuously changes its operating frequency point, the following steps are further included:

[0020] Control the signal source to lock two different frequency points within the target frequency band and start the test process for the device under test;

[0021] After controlling one of the signal generators to complete the test of one frequency point, automatically switch to the next frequency point until the tests of all frequency points within the predetermined frequency band are completed.

[0022] In one embodiment, in the step of polling and collecting the reflected signals generated by each test signal through the signal acquisition unit, the following steps are included:

[0023] Amplify the power of the reflected signals uploaded by each multiplexer through a signal amplifier;

[0024] Control the polling controller to perform polling switching through a digital receiver to receive the reflected signals that have been power-amplified for each path at different times.

[0025] In one embodiment, in the step of controlling one or more signal sources to respectively generate carrier signals at two different frequencies within their respective target frequency bands, the following steps are further included:

[0026] Connect to an external reference source through a reference source interface and receive the calibration signal of the external reference source to calibrate the frequency accuracy of the signal source.

[0027] In one embodiment, in the step of polling and collecting the reflected signals generated by each test signal through the signal acquisition unit, the following steps are further included:

[0028] Control the local oscillator to generate a local oscillator signal, mix the local oscillator signal with the reflected signal to generate an intermediate frequency signal, and output the intermediate frequency signal to the digital controller.

[0029] In one embodiment, after the step of generating test data based on the reflected signal, the following steps are further included:

[0030] Perform data communication with an external control device through the communication interface to upload the test data to the external control device.

[0031] To meet one of the purposes of the present invention, a multi-port multi-band intermodulation test device is provided, including a plurality of signal sources, a signal crossover network, a signal acquisition unit, and a controller, and the controller is configured to execute the method described in any one of the previous purposes.

[0032] Compared with the prior art, the present invention has multiple advantages, including but not limited to:

[0033] On the one hand, the intermodulation test method controls one or more signal sources to generate carrier signals at two different frequencies within their respective target frequency bands, and uses the signal crossover network to combine and distribute these carrier signals into multiple test signals. This way avoids the cumbersome process of testing each frequency band and port one by one in the traditional test method, and greatly improves the test efficiency. Especially when facing complex passive devices with multiple ports and multiple frequency bands to be tested, the intermodulation test efficiency can be greatly improved.

[0034] On the other hand, the method of the present invention combines the carrier signals into a mixed wave signal through the signal crossover network and distributes it into multiple test signals, so that each test signal contains a mixed wave signal of one frequency band or multiple frequency bands, and can be simultaneously connected to multiple signal ports of an external passive device or connected to multiple signal ports of multiple external passive devices. This avoids the cumbersome process of testing each port one by one in the traditional method, greatly shortens the test time, and improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, where:

[0036] Figure 1 is a circuit principle block diagram of the intermodulation test device of a typical embodiment of the present invention.

[0037] Figure 2 is a flow schematic diagram of the intermodulation test method of a typical embodiment of the present invention.

[0038] Figure 3 The flowchart of the step of controlling one or more signal sources to respectively generate carrier signals at two different frequency points within their respective target frequency bands in one embodiment of the present invention.

[0039] Figure 4 The flowchart of the step of controlling one of the signal generators of the signal source corresponding to the target frequency band to fixedly operate at the same frequency point and the other signal generator to continuously change its operating frequency band in one embodiment of the present invention.

[0040] Figure 5 The flowchart of the step of polling and collecting the reflected signals generated by each test signal through the signal acquisition unit in one embodiment of the present invention.

[0041] Figure 6 The structural principle block diagram of the intermodulation test network in a typical embodiment of the present invention.

[0042] Figure 7 The flowchart of the method for controlling the intermodulation test network in a typical embodiment of the present invention.

[0043] Figure 8 The flowchart of the post - step of the method for controlling the intermodulation test network in one embodiment of the present invention.

[0044] Figure 9 The flowchart of the step of enabling the intermodulation test device to control one or more signal sources to respectively generate carrier signals at two different frequency points within their respective target frequency bands based on the test instruction in one embodiment of the present invention.

[0045] Figure 10 The flowchart of the step of the intermodulation test device controlling one of the signal generators of the signal source corresponding to the target frequency band to fixedly operate at the same frequency point and the other signal generator to continuously change its operating frequency point in one embodiment of the present invention.

[0046] Figure 11 The flowchart of the step of polling and collecting the reflected signals generated by each test signal through the signal acquisition unit of the intermodulation test device in one embodiment of the present invention. Detailed Embodiment

[0047] The embodiments of the present invention are described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described by referring to the drawings are exemplary and are only used to explain the present invention and cannot be construed as limiting the present invention.

[0048] Those skilled in the art can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the", and "said" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of the present invention means the presence of the described features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or their groups. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0049] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention pertains. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as herein.

[0050] The present invention provides a multi-port multi-band intermodulation test method, which is implemented based on an intermodulation test device 100. The intermodulation test device 100 has a plurality of test ports, and each test port can implement intermodulation tests for multiple frequency bands, so that the intermodulation test device 100 can simultaneously perform multi-band intermodulation tests on a plurality of test specimens, or the intermodulation test device 100 can perform multi-band intermodulation tests on multiple ports of a test specimen to improve the intermodulation detection efficiency. The test specimen is an external passive device, such as a multi-frequency and / or multi-port antenna, a combiner, a multiplexer, and a coupler.

[0051] In a typical embodiment of the present invention, in combination with Figure 1 , the intermodulation test device 100 includes a controller (not shown), a signal acquisition unit, a signal cross network, and a plurality of signal sources 120. The controller is electrically connected to the signal acquisition unit, the signal sources 120, and the signal cross network respectively, so as to facilitate the controller to control the operation of the intermodulation test device 100.

[0052] The plurality of signal sources 120 operate in different frequency bands respectively, so that the intermodulation test device 100 can implement multi-band intermodulation tests on a test specimen. The signal source 120 is used to generate two carrier signals with different frequencies within the same frequency band.

[0053] Specifically, the signal source 120 includes two signal generators 124, and the two signal generators 124 operate within the same frequency band. The controller is electrically connected to the two signal generators 124. The controller controls one of the two signal generators 124 to operate at a first frequency point and controls the other signal generator 124 to operate at a second frequency point, and the first frequency point is different from the second frequency point. For example, the signal source 120 operates in the frequency band of 1800 - 1900 MHz, the first frequency point is 1805 MHz, and the second frequency point is 1879 MHz.

[0054] In one embodiment, the signal source 120 further includes a frequency controller (not shown), and the frequency controller is electrically connected to the controller and the two signal generators 124 of the signal source 120 respectively. The controller sends a frequency point control instruction to the frequency controller, and the frequency controller controls the operating frequency point of the signal generator 124 based on the frequency point control instruction, so that the signal generator 124 can correspondingly change the operating frequency point to adapt to different intermodulation test requirements.

[0055] In a typical implementation of the present invention, the signal cross-network includes a plurality of combiners 131, a plurality of power splitting modules 132, and a plurality of multiplexers 133. The signal cross-network is configured with one combiner 131 and one power splitting module 132 corresponding to one signal source 120.

[0056] Specifically, the two signal generators 124 of the signal source 120 are simultaneously electrically connected to the combiner 131, and the two signal generators 124 respectively generate a carrier signal, that is to say, the two signal generators 124 correspondingly generate two carrier signals. The two carrier signals are input into the combiner 131, and the combiner 131 combines the two carrier signals to generate a mixed wave signal.

[0057] In one embodiment, the combiner 131 can be replaced by a hybrid (not shown), and the hybrid can play the role of the combiner 131. The hybrid is suitable for combining signals in the same frequency band, that is to say, the hybrid can well combine the two carrier signals output by the two signal generators 124 of the same signal source 120. In this embodiment, it is recommended that the hybrid be a 3 dB hybrid, but it should not be construed as a limitation to the present invention.

[0058] In a typical embodiment of the present invention, a power amplifier module 134 is further provided between the signal generator 124 and the combiner 131. The power amplifier module 134 is electrically connected to the signal generator 124 and the combiner 131 respectively. The power amplifier module 134 amplifies the power of the carrier signal output from the signal generator 124 so that the carrier signal can be used for subsequent intermodulation tests.

[0059] The signal cross-network is provided with a power splitting module 132 corresponding to the combiner 131. The power splitting module 132 is electrically connected to the corresponding combiner 131. The combiner 131 outputs the mixed-wave signal to the power splitting module 132. The power splitting module 132 divides the mixed-wave signal into multiple paths of signals. To distinguish it from the mixed-wave signal, the signal generated by the power splitting of the power splitting module 132 is called a mixed signal. That is to say, the power splitting module 132 splits the mixed-wave signal output by the combiner 131 into multiple paths of mixed signals. For example, the power splitting module 132 splits the mixed-wave signal into two paths of mixed signals or three paths of mixed signals or four paths of mixed signals, etc. In one embodiment, the power splitting module 132 can be a power splitter. For example, the power splitting module 132 is a one-to-three power splitter or a one-to-four power splitter, etc., but it should not be construed as a limitation of the present invention.

[0060] In a typical embodiment of the present invention, the power splitting module 132 includes multiple power splitters 135. In this embodiment, the power splitter 135 is taken as an example of a one-to-two power splitter 135 to describe the present invention, but it should not be construed as a limitation of the present invention. The combiner 131 divides the combined mixed-wave signal into multiple paths. The number of the multiple paths of mixed-wave signals corresponds to the number of the corresponding power splitters 135. The combiner 131 respectively outputs the multiple paths of mixed-wave signals to the multiple power splitters 135.

[0061] After receiving a corresponding path of mixed-wave signal, the power splitter 135 splits the path of mixed-wave signal into two paths of mixed signals. In this embodiment, the power splitting module 132 can increase the number of power splitters 135 to increase the number of paths of the mixed signals generated by splitting the mixed-wave signal. For example, the power splitting module 132 can set two power splitters 135 to generate four paths of mixed signals, or set three power splitters 135 to generate six paths of mixed signals, or four power splitters 135 to generate eight paths of mixed signals... and so on.

[0062] In this embodiment, taking the power splitter module 132 as an example where there are two power splitters 135, the present invention is described, but it should not be construed as a limitation to the present invention. It can be understood that the combiner 131 outputs a mixed wave signal to each of the two power splitters 135 of the power splitter module 132. Each of the two power splitters 135 splits the input mixed wave signal. Each power splitter 135 splits the mixed wave signal into two mixed signals, and the two power splitters 135 correspondingly split the two mixed wave signals into four mixed signals.

[0063] The signal cross network is provided with a plurality of multiplexers 133. The number of the multiplexers 133 corresponds to the number of paths of the mixed signals generated by power splitting of one power splitter module 132. The multiple paths of mixed signals generated by power splitting of the power splitter module 132 are respectively output to the plurality of multiplexers 133. That is to say, the plurality of signal sources 120 respectively output a mixed signal to each multiplexer 133, so that each multiplexer 133 can receive a mixed signal output by a plurality of signal sources 120 operating in different frequency bands. Thus, the multiplexer 133 can mix a plurality of mixed signals in different frequency bands to form a test signal. The multiplexer 133 is electrically connected to the signal port of the device under test. The multiplexer 133 inputs the test signal into the device under test through the signal port of the device under test to perform an intermodulation test on the device under test.

[0064] The multiplexer 133 is provided with a plurality of TX ports (transmission ports). The number of TX ports of the multiplexer 133 corresponds to the number of power splitter modules 132 of the signal cross network, so that the multiplexer 133 can be correspondingly electrically connected to a plurality of power splitter modules 132 through a plurality of TX ports, facilitating the multiplexer 133 to receive a plurality of mixed signals in different frequency bands. Since the plurality of signal sources 120 respectively operate at different frequency points, the frequency bands of the mixed signals generated by the plurality of signal sources 120 respectively passing through the corresponding combiners 131 and power splitter modules 132 are different, so that the frequency bands of the mixed signals output by the plurality of power splitter modules 132 to the same multiplexer 133 are different.

[0065] In this embodiment, taking the intermodulation test device 100 as an example where there are three signal sources 120 operating in different frequency bands, the present invention is described, but it should not be construed as a limitation to the present invention. Since the intermodulation test device 100 has three signals operating in different frequency bands, the intermodulation test device 100 can perform third-order and higher-order intermodulation tests, expanding the intermodulation range of the intermodulation test device 100.

[0066] In this embodiment, for the convenience of description, it is assumed that the power splitting module 132 includes two power splitters 135, and four mixed signals can be generated by power splitting as an example to describe the present invention, but it should not be construed as a limitation to the present invention. The signal cross-network is provided with four multiplexers 133, and the four mixed signals generated by power splitting by the power splitting module 132 are respectively output to the four multiplexers 133.

[0067] In this embodiment, the intermodulation test device 100 is provided with three signal sources 120. The signal cross-network separately configures components such as a power amplifier module 134, a combiner 131, and a power splitting module 132 for each signal source 120. Each power splitting module 132 outputs four mixed signals, and the three power splitting modules 132 corresponding to the three signal sources 120 output a total of twelve mixed signals.

[0068] The multiplexer 133 is configured with three TX ports corresponding to the three signal sources 120, and these three TX ports are respectively referred to as the first TX port, the second TX port, and the third TX port. The signal cross-network is configured with three power splitting modules 132 for the three signal sources 120. The three power splitting modules 132 respectively correspond to the three signal sources 120, and the three signal sources 120 are respectively referred to as the first signal source 121, the second signal source 122, and the third signal source 123. Among them, the power splitting module corresponding to the first signal source 121 is the first power splitting module 1321, the power splitting module corresponding to the second signal source 122 is the second power splitting module 1322, and the power splitting module corresponding to the third signal source 123 is the third power splitting module 1323.

[0069] Among them, one of the mixed signals output by the first power splitting module 1321 (this mixed signal is referred to as the first mixed signal) is output to the first TX port of the multiplexer 133, one of the mixed signals output by the second power splitting module 1322 (this mixed signal is referred to as the second mixed signal) is output to the second TX port of the multiplexer 133, and one of the mixed signals output by the third power splitting module 1323 (this mixed signal is referred to as the third mixed signal) is output to the third TX port of the multiplexer 133, so that the multiplexer 133 can receive these three mixed signals with different frequency bands.

[0070] When it is necessary to perform third-order intermodulation testing on the device under test, the controller controls one of the three signal sources 120 to work. Taking the controller controlling the first signal source 121 to work and the second signal source 122 and the third signal source 123 not working as an example, the present invention is described, but it should not be construed as a limitation to the present invention. The controller controls the first signal source 121 to work. The two carrier signals output by the first signal source 121 pass through the power amplifier module 134, the combiner 131, and the first power splitter module 1321 in sequence to generate a first mixed signal. The first mixed signal is output to the multiplexer 133. The multiplexer 133 outputs the first mixed signal as a test signal to the signal port of the device under test to perform intermodulation testing on the device under test.

[0071] Specifically, since the two signal generators 124 of the first signal source 121 can generate two carrier signals with different frequencies in the same frequency band, when performing intermodulation testing on the device under test, the first signal source 121 controls one of the signal generators 124 (referred to as the first signal generator 1241) to generate a carrier signal with a fixed frequency (referred to as the first carrier signal), and the first signal source 121 controls the other signal generator 124 (referred to as the second signal generator 1242) to generate a second carrier signal with a continuously changing frequency. The first carrier signal and the second carrier signal are combined to generate a first mixed signal. Since the frequency of the second carrier signal continuously changes, the first mixed signal continuously changes. The continuously changing first mixed signal is output as a test signal to the device under test to perform third-order intermodulation testing on the device under test corresponding to the frequency band where the first signal source 121 is located.

[0072] For example, the first signal source 121 operates in the range of 1800 - 1900 MHz. The frequency of the first carrier signal is fixed at 1805 MHz, and the second carrier signal is 1880 MHz but steps down by 1 MHz. The frequency of the second carrier signal sweeps down from 1880, 1979, 1878... 1825 MHz in sequence. The first carrier signal and the second carrier signal are combined to continuously generate different first mixed signals. The multiplexer 133 outputs the first mixed signal as a test signal to the device under test to continuously perform intermodulation testing on the device under test.

[0073] Alternatively, the frequency of the second carrier signal is fixed at 1880 MHz, and the frequency of the first carrier signal is 1805 MHz but steps up by 1 MHz. The frequency of the first carrier signal sweeps up from 1805, 1806, 1807... 1832.5 MHz. The first carrier signal and the second carrier signal are combined to continuously generate different first mixed signals. The multiplexer 133 outputs the first mixed signal as a test signal to the device under test to continuously perform intermodulation testing on the device under test.

[0074] Alternatively, when third-order or higher-order intermodulation of the device under test is required, the controller controls two of the three signal sources 120 to operate. Taking the controller controlling the first signal source 121 and the second signal source 122 to operate while the third signal source 123 does not operate as an example, the present invention will be described, but it should not be construed as a limitation to the present invention. The controller simultaneously controls the first signal source 121 and the second signal source 122 to operate. The first signal source 121 generates a first mixed signal through the first power amplifier module 134, and the second signal source 122 generates a second mixed signal through the second power splitter module 1322.

[0075] The multiplexer 133 receives the first mixed signal through its first TX port and the second mixed signal through its second TX port. The multiplexer 133 combines the first mixed signal and the second mixed signal to form a test signal. The multiplexer 133 outputs the test signal to the signal port of the device under test to perform an intermodulation test on the device under test.

[0076] It can be seen from this that when the intermodulation test device 100 has three signal sources 120 operating in different frequency bands, a total of six intermodulation test modes can be formed to realize the three-frequency intermodulation function of the intermodulation test device 100. Assume that the first signal source 121 operates in the first frequency band, the second signal source 122 operates in the second frequency band, and the third signal source 123 operates in the third frequency band, and the first frequency band, the second frequency band, and the third frequency band do not overlap each other. The six intermodulation test modes are respectively: the first frequency band, the second frequency band, the third frequency band, the first frequency band + the second frequency band, the first frequency band + the third frequency band, and the second frequency band + the third frequency band. For example, the first frequency band is 1800 - 1900 MHz, the second frequency band is 2100 - 2200 MHz, and the third frequency band is 2600 - 2700 MHz.

[0077] Since the intermodulation test device 100 has multiple multiplexers 133, each multiplexer 133 plays the same role, and each multiplexer 133 generates the same test signal at the same moment, so that the multiple multiplexers 133 can correspondingly test multiple devices under test to improve the intermodulation test efficiency. Alternatively, the device under test has multiple signal ports, and the multiple multiplexers 133 of the intermodulation test device 100 are respectively electrically connected to the multiple signal ports of the device under test, so that the intermodulation test device 100 can perform intermodulation tests on the multiple signal ports of the device under test to improve the test efficiency of the device under test with multiple ports.

[0078] In an embodiment of the present invention, taking the example that the intermodulation test device 100 has four multiplexers 133, the intermodulation test device 100 can perform intermodulation tests through the four multiplexers 133 working simultaneously. In other words, the four multiplexers 133 are equivalent to the four test ports of the intermodulation test device 100, and the intermodulation test efficiency is improved through the four test ports. Moreover, since the intermodulation test device 100 has three signal sources 120 operating in different frequency bands, the intermodulation test device 100 constitutes a three-frequency four-port intermodulation test device 100.

[0079] In this embodiment, when the intermodulation test device 100 of the present invention tests a device under test with multiple ports and operating in multiple frequency bands, the number of cable pluggings and unpluggings can be significantly reduced, the intermodulation test efficiency can be improved, and the test time can be reduced.

[0080] For example, when a traditional single-frequency two-port intermodulation tester tests a four-port broadband (1800 MHz, 2100 MHz, 2600 MHz) base station antenna, since each frequency band needs to be tested separately and each port needs to be connected separately, the cable needs to be plugged and unplugged multiple times. Specifically, for a base station antenna with 3 frequency bands and 4 ports, the number of ports to be tested is 3×4 = 12. Each cable needs to be plugged and unplugged twice, with one end of the cable plugged into the intermodulation tester and the other end plugged into the base station antenna. Therefore, the cable needs to be plugged and unplugged 24 times in total.

[0081] However, when using the intermodulation test device 100 of the present invention, since the intermodulation test device 100 of the present invention has four multiplexers 133, which is equivalent to having four test ports, the intermodulation test device 100 of the present invention can connect the 4 ports of the base station antenna at one time and can test 3 frequency bands simultaneously. Thus, only 4 cables need to be connected between the intermodulation test device 100 of the present invention and the base station antenna, and each cable is connected twice, with one end of the cable plugged into the intermodulation test device 100 of the present invention and the other end plugged into the base station antenna. In total, only 8 cable pluggings and unpluggings are needed. Therefore, the number of cable pluggings and unpluggings is reduced from 24 times to 8 times, the efficiency is increased by 3 times, and the test time is also reduced by more than half.

[0082] Furthermore, if a three-frequency 32-port 5G Massive antenna is tested through networking, using the intermodulation test device 100 of the present invention can further significantly reduce the number of cable connections and the test time, and the efficiency is increased by more than 7 times. This is because the intermodulation test device 100 of the present invention can connect and test multiple ports of the 5G Massive antenna at one time, greatly reducing the time for cable plugging, unplugging, and disconnection, and improving the test efficiency.

[0083] Therefore, the intermodulation test device 100 of the present invention completely changes the cumbersome process of replacing intermodulation meters with different frequency bands for multiple tests in traditional intermodulation tests, greatly reduces the number of cable pluggings and unpluggings, effectively reduces the loss of expensive intermodulation test cables, and also reduces the requirement for anechoic chambers in intermodulation tests, further significantly reducing the overall cost of intermodulation tests.

[0084] In a typical embodiment of the present invention, the intermodulation test device 100 having three signal sources 120 operating in different frequency bands and four multiplexers 133 is taken as an example for illustration, but this should not be regarded as a limitation to the present invention. After understanding the technical solution of the present invention, those skilled in the art can adaptively increase the number of signal sources 120 operating in different frequency bands and the number of multiplexers 133 to expand the application scope of the intermodulation test device 100. These technical solutions that can be achieved without creative labor based on the present invention all fall within the protection scope of the present invention. For example, on the basis that the intermodulation test device 100 has three signal sources 120 operating in different frequency bands and four multiplexers 133, one more signal source 120 operating in a different frequency band and one more multiplexer 133 are further added, so that the intermodulation test device 100 has four signal sources 120 operating in different frequency bands and five multiplexers 133.

[0085] In one embodiment, the signal cross network is provided with a plurality of circulators 136 corresponding to one multiplexer 133. The plurality of circulators 136 are arranged corresponding to the plurality of TX ports of the multiplexer 133. The mixed signals input to the multiplexer 133 from the respective power splitting modules 132 need to pass through the corresponding circulators 136 first and then be input to the multiplexer 133 through the corresponding TX ports. The circulator 136 is used to isolate the mixed signals transmitted from the power splitting module 132 to the multiplexer 133 to block reverse signal interference, reduce signal distortion and interference, and improve the accuracy of intermodulation tests. In this embodiment, the multiplexer 133 has three TX ports, and one circulator 136 is configured for each of the three TX ports, that is, three circulators 136 are configured for the multiplexer 133.

[0086] Furthermore, during the intermodulation test, the standing wave ratio of the device under test significantly affects the intermodulation test accuracy. The standing wave ratio is an index to measure the matching degree between an antenna or a transmission line and a load. When the standing wave ratio is greater than 1, it indicates that there is reflection, which will cause uneven power distribution among the shunt channels of the power splitter module 132, thus affecting the test accuracy. The intermodulation test device 100 realizes the simultaneous transmission of test signals by all multiplexers 133 through power splitting. However, if the standing wave ratio of the signal port of a device under test is relatively high during the intermodulation test, that is, there is a large reflection, this will affect the power distribution of each multiplexer 133, resulting in unstable output power of each multiplexer 133 and unable to perform accurate tests. To solve this problem, the present invention connects a circulator 136 corresponding to the frequency band in series before the TX port of the multiplexer 133. The circulator 136 can withstand power reflection for a short time, thereby ensuring that the power of each multiplexer 133 is equal and solving the test accuracy problem when the port is adapted or open-circuited.

[0087] In a typical embodiment of the present invention, the signal acquisition unit of the intermodulation test device 100 includes a signal amplifier 141, a polling controller 142, and a digital receiver 143. The multiplexer 133 further includes an RX port (receiving port). After the multiplexer 133 outputs a test signal to the device under test to perform an intermodulation test, the device under test will generate a reflected signal. The multiplexer 133 receives the reflected signal, and the multiplexer 133 outputs the reflected signal to the signal amplifier 141 through the RX port. The signal amplifier 141 amplifies the power of the reflected signal. Then, the signal amplifier 141 outputs the reflected signal to the digital receiver 143 through the polling controller 142. After receiving the reflected signal, the digital receiver 143 transmits the reflected signal to the controller, and the controller generates test data based on the reflected signal, thereby obtaining the intermodulation test data of the device under test.

[0088] Specifically, the multiple multiplexers 133 share the same signal amplifier 141, or each multiplexer 133 is respectively configured with a signal amplifier 141. In this embodiment, the multiple multiplexers 133 share the same polling controller 142. After the reflected signals output by the multiple multiplexers 133 are output through the corresponding signal amplifiers 141, they are output to the polling controller 142.

[0089] The digital receiver 143 is used to control the operation of the polling controller 142, such that the polling controller 142 polls and receives the reflected signals output by a plurality of multiplexers 133. That is to say, under the control of the digital receiver 143, the polling controller 142 receives, through time-division multiplexing, only the reflected signal output by one multiplexer 133 at a time, so as to avoid the mixing and interference of the reflected signals output by the plurality of multiplexers 133 respectively. In this embodiment, it is recommended that the polling controller 142 be a single-pole multi-throw electronic switch, but it should not be construed as a limitation of the present invention.

[0090] The polling controller 142 outputs the reflected signals received at different times to the digital receiver 143, and the digital receiver 143 converts the reflected signals into digital signals, so as to facilitate the controller to analyze the digital signals and obtain the intermodulation test data of the specimen to be tested. In this embodiment, the digital receiver 143 converts signal characteristics such as the amplitude, frequency, and phase of the reflected signal into digital signals. For example, through steps such as analog-to-digital conversion, down-conversion, quadrature demodulation, and digital signal processing, the accurate measurement and analysis of the reflected signal are realized. The digital signal provides an accurate data basis for the subsequent analysis by the controller, so as to facilitate the generation of accurate test data. In this embodiment, it is recommended that the controller be a computer, but it should not be construed as a limitation of the present invention.

[0091] In one embodiment, the intermodulation test device 100 further includes a local oscillator source 145, and the local oscillator source 145 is electrically connected to the polling controller 142. After the controller controls the intermodulation test device 100 to generate a high-frequency test signal, the specimen to be tested will correspondingly return a high-frequency reflected signal. Since the frequency of the high-frequency reflected signal is relatively high, it is difficult to directly process these high-frequency signals.

[0092] In response to this, the controller controls the local oscillator source 145 to generate a local oscillator signal, and mixes the local oscillator signal with the high-frequency reflected signal received by the polling controller 142, so as to convert the high-frequency reflected signal into an intermediate-frequency signal, thereby reducing the frequency of the reflected signal and making it easier for the subsequent digital receiver 143 to perform digital processing on the intermediate-frequency signal.

[0093] In one embodiment, the intermodulation test device 100 further includes a reference source interface (not shown), the reference source interface is used to be electrically connected to an external reference source, and the reference source interface is disposed on the controller. The controller provides a high-precision clock signal for the intermodulation test device 100 based on the reference source, ensures the frequency stability of the plurality of signal sources 120 and the local oscillator source 145 of the intermodulation test device 100, and improves the test accuracy of the intermodulation test device 100.

[0094] In this embodiment, the reference source is a temperature-compensated crystal oscillator (TCXO) or an oven-controlled crystal oscillator (OCXO). In this embodiment, it is recommended that the reference source be an oven-controlled crystal oscillator, and the frequency accuracy and long-term frequency stability of the oven-controlled crystal oscillator are at least several orders of magnitude higher than those of a general temperature-compensated crystal oscillator. Using an oven-controlled crystal oscillator as the reference source can significantly improve the phase noise performance of the signal source 120, reduce carrier spurs, and thus improve the overall performance of the intermodulation test device 100.

[0095] In one embodiment, the intermodulation test device 100 further includes a first housing 151 and a second housing 152. The signal source 120, the digital receiver 143, the polling controller 142, and the local oscillator 145 are installed in the first housing 151, and the signal cross network is installed in the second housing 152. Components such as the signal source 120 and the digital receiver 143 generate electromagnetic radiation during operation, while the signal cross network is susceptible to external interference or becomes a radiation source. Placing them in different housings can reduce electromagnetic interference between different components and improve the electromagnetic compatibility of the device. In addition, installing different functional modules in different housings helps to achieve modularization and integration of functions. Components such as the signal source 120, the digital receiver 143, the polling controller 142, and the local oscillator 145 are mainly responsible for signal generation, reception, and processing, while the signal cross network is responsible for signal distribution and routing. By installing them in different housings respectively, functional partitioning and integration can be better achieved.

[0096] In a typical embodiment of the present invention, the intermodulation test device 100 is further provided with a display screen (not shown), the controller is electrically connected to the display screen, and the controller can output the intermodulation test data of the test piece to the display screen for display, so that the user can directly obtain the test data of the test piece through the display screen.

[0097] In one embodiment, the controller is further provided with a communication interface (not shown), and the controller performs data communication with an external control device through the communication interface. Specifically, the controller submits test data to the external control device through the communication interface, and at the same time, the controller can also receive test instructions output by the external control device through the communication interface. Based on the test instructions, the controller can control the working state and test process of the intermodulation test device 100, enabling the intermodulation test device 100 to perform effective data interaction and instruction control with the external control device, improving the automation degree and test efficiency of the device. For example, during third-order intermodulation testing, the controller can accurately control the output frequency and power of the signal source 120 according to the instructions of the external control device, so as to achieve testing of different frequency bands and different power combinations.

[0098] In addition, the communication interface can also be used to receive test instructions output by an external control device, enabling the controller to control the operation of the intermodulation test device 100 based on the test instructions, further improving the flexibility and efficiency of the test. In this embodiment, it is recommended that the communication interface support multiple interfaces such as LAN, USB, and GB IP, and be compatible with the SCP I standard protocol, ensuring unobstructed data interaction with various programming languages.

[0099] The present invention also provides a multi-port multi-band intermodulation test method. This intermodulation test method is implemented based on the intermodulation test device 100 described above, and the controller of the intermodulation test device 100 is used to execute the intermodulation test method, enabling the intermodulation test device 100 to perform intermodulation tests on the device under test well based on the intermodulation test method. In a typical embodiment of the present invention, please refer to Figure 2 , the intermodulation test method includes the following specific steps:

[0100] Step S1100, controlling one or more signal sources to generate carrier signals at two different frequency points within their respective target frequency bands;

[0101] The multiple signal sources 120 of the intermodulation test device 100 operate at different frequency points respectively. The controller controls the signal sources 120 to generate two carrier signals respectively, and these two carrier signals operate at different frequency points within the same frequency band.

[0102] When the device under test needs to perform an intermodulation test on a target frequency band, the controller controls the signal source 120 corresponding to this target frequency band to operate, so as to cause the corresponding signal source 120 to generate two carrier signals with different frequency points, that is to say, the signal source 120 generates two carrier signals with different frequency points within the same frequency band.

[0103] When the device under test needs to perform an intermodulation test by combining two target frequency bands, the controller controls the signal sources 120 corresponding to these two target frequency points to operate. It can be understood that the controller controls two signal sources 120 operating in different frequency bands to operate, and these two signal sources 120 each generate corresponding two carrier signals, that is to say, the two signal sources 120 generate four carrier signals.

[0104] Step S1200, combining the carrier signals into a mixed wave signal through a signal cross network and distributing it into multiple test signals, so that each test signal includes a mixed wave signal of one frequency band or multiple frequency bands, for accessing the signal ports of external passive devices;

[0105] The signal cross-network of the intermodulation test device 100 is separately configured with a combiner 131 and a power splitting module 132 for each signal source 120. Two carrier signals with different frequencies in the same frequency band generated by the signal source 120 are output to the combiner 131. The combiner 131 combines the two carrier signals into a mixed wave signal, and the combiner 131 outputs the mixed wave signal to the power splitting module 132. The power splitting module 132 splits the mixed wave signal into multiple mixed signals.

[0106] The signal cross-network is provided with a plurality of multiplexers 133, and the number of the multiplexers 133 is the same as the number of the mixed signals generated by power splitting of the same power splitting module 132. The power splitting module 132 respectively outputs the multiple mixed signals generated by power splitting to the plurality of multiplexers 133, that is to say, each multiplexer 133 can receive one mixed signal output by the same power splitting module 132.

[0107] When an intermodulation test needs to be performed on a DUT for a target frequency band, the controller controls the signal source 120 corresponding to the target frequency point to work, and controls the remaining signal sources 120 not to work, so that the multiplexer 133 can only receive one mixed signal generated by the signal source 120 corresponding to the target frequency band. The multiplexer 133 outputs the received mixed signal as a test signal to the DUT to perform the intermodulation test.

[0108] When an intermodulation test needs to be performed on a DUT by combining two target frequency bands, the controller controls the signal sources 120 corresponding to the two target frequency bands to work, and controls the remaining signal sources 120 not to work, so that the multiplexer 133 can only receive one mixed signal generated by each of the signal sources 120 corresponding to the two target frequency bands. It can be understood that the multiplexer 133 receives two mixed signals, and the two mixed signals come from two signal sources 120 with different frequency bands respectively. The multiplexer 133 combines the two received mixed signals into a test signal and outputs the test signal to the DUT to perform the intermodulation test.

[0109] The signal cross-network has a plurality of multiplexers 133. The plurality of multiplexers 133 have the same function, and each multiplexer 133 generates the same test signal at the same moment, so that the plurality of multiplexers 133 can correspondingly test a plurality of DUTs to improve the intermodulation test efficiency. Or, the DUT has a plurality of signal ports, and the plurality of multiplexers 133 of the intermodulation test device 100 are respectively electrically connected to the plurality of signal ports of the DUT, so that the intermodulation test device 100 can perform intermodulation tests on the plurality of signal ports of the DUT to improve the test efficiency of the multi-port DUT.

[0110] Step S1300, the signal acquisition unit polls and acquires the reflected signals generated by each test signal, and generates test data based on the reflected signals;

[0111] The specimen to be tested generates a reflected signal in response to the test signal. The multiplexer 133 outputs the received reflected signal to the signal acquisition unit, and the signal acquisition unit outputs the reflected signal to the controller. The controller analyzes and obtains the corresponding intermodulation test data based on the reflected signal.

[0112] Since multiple multiplexers 133 all output reflected signals to the controller via the signal acquisition unit, the controller sequentially analyzes and obtains the corresponding intermodulation test data for each of the multiple received reflected signals.

[0113] When the multiple multiplexers 133 are respectively connected to different specimens to be tested, the reflected signals output by each of the multiple multiplexers 133 correspond to different specimens to be tested, and the controller generates intermodulation test data for multiple specimens to be tested based on the multiple reflected signals.

[0114] When the multiple multiplexers 133 are respectively electrically connected to multiple signal ports of the same specimen to be tested, the reflected signals output by each of the multiple multiplexers 133 correspond to different signal ports of the same specimen to be tested, and the controller generates intermodulation test data for different signal ports of the same specimen to be tested based on the multiple reflected signals.

[0115] Based on any embodiment of the intermodulation test method of the present invention, in the step of controlling one or more signal sources to respectively generate carrier signals at two different frequency points within their respective target frequency bands, the following specific steps are further included:

[0116] Step S1110, control two signal generators of the signal source corresponding to the target frequency band to work, and the two signal generators respectively generate carrier signals at two different frequency points;

[0117] The multiple signal sources 120 of the intermodulation test device 100 respectively operate at different frequency points. The controller controls two signal generators 124 of the signal source 120 to respectively generate two carrier signals, and the two carrier signals operate at different frequency points within the same frequency band.

[0118] Based on any embodiment of the intermodulation test method of the present invention, please refer to Figure 3 , in the step of controlling one or more signal sources to respectively generate carrier signals at two different frequency points within their respective target frequency bands, the following specific steps are included:

[0119] Step S1120, receive a test instruction, and the test instruction includes information about one or more target frequency bands corresponding to the intermodulation test;

[0120] The external control device outputs a test instruction to the controller, and the test instruction includes one or more target frequency band information corresponding to the intermodulation test. When the intermodulation test instruction contains one target frequency band information, it indicates that this intermodulation test performs the intermodulation test on the test piece for this one target frequency band. When the intermodulation test instruction contains two or more target frequency band information, it indicates that this intermodulation test performs the intermodulation test on the test piece for the combination of two or more target frequency points.

[0121] Step S1130, based on the one or more target frequency band information, control one or more corresponding signal sources to generate corresponding carrier signals;

[0122] When the test instruction contains one target frequency band information, the controller controls the signal source 120 of the corresponding frequency band based on this one target frequency band information to generate two carrier signals with different frequencies.

[0123] When the test instruction contains two or more target frequency band information, the controller controls two or more corresponding signal sources 120 of the frequency bands to each generate two carrier signals with different frequencies based on the two or more target frequency band information. In other words, the controller controls each signal source 120 to each generate two carrier signals with different frequencies in the same frequency band.

[0124] Based on any embodiment of the intermodulation test method of the present invention, in the step of controlling one or more corresponding signal sources to generate corresponding carrier signals based on the one or more target frequency band information, the following specific steps are included:

[0125] Step S1131, when the test instruction includes one target frequency band information, control the signal generator in the signal source corresponding to this target frequency band to fixedly operate at the same frequency point, and the other signal generator continuously changes its operating frequency point;

[0126] When the test piece needs to perform an intermodulation test on one target frequency band, the controller controls the signal source 120 corresponding to this target frequency point to operate, and controls the remaining signal sources 120 not to operate, so that the multiplexer 133 can only receive one mixed signal corresponding to the signal source 120 corresponding to the target frequency band. The multiplexer 133 outputs the received one mixed signal as a test signal to the test piece to perform the intermodulation test.

[0127] Specifically, since the two signal generators 124 of the signal source 120 can generate two carrier signals with different frequencies in the same frequency band, when performing an intermodulation test on the device under test, the controller controls the first signal generator 1241 to generate a first carrier signal with a fixed frequency, and the controller controls the second signal generator 1242 to generate a second carrier signal with a continuously changing frequency. The first carrier signal and the second carrier signal are combined to generate a mixed signal. Since the frequency of the second carrier signal continuously changes, the mixed signal continuously changes. The continuously changing mixed signal is used as a test signal and output to the device under test to perform a third-order intermodulation test on the device under test for the corresponding target frequency band.

[0128] Based on any embodiment of the intermodulation test method of the present invention, please refer to Figure 4 , in the step of controlling one of the signal generators corresponding to the signal source of the target frequency band to fixedly operate at the same frequency point and the other signal generator to continuously change its operating frequency band, the following steps are further included:

[0129] Step S1132, control the signal source to lock two different frequency points within the target frequency band and start the test process for the device under test;

[0130] When it is necessary to start the intermodulation test, the controller controls the first signal generator 1241 of the signal source 120 to be fixed at the first frequency point, and controls the second signal generator 1242 of the signal source 120 to be fixed at the second frequency point. After the multiple multiplexers 133 of the intermodulation test device 100 are respectively electrically connected to multiple devices under test, the controller starts the intermodulation test process.

[0131] In the intermodulation test device 100, before it is necessary to start the intermodulation test, the controller controls the first signal generator 1241 of the signal source 120 to be fixed at the first frequency point, and at the same time controls the second signal generator 1242 of the signal source 120 to be fixed at the second frequency point. After the multiple multiplexers 133 of the intermodulation test device 100 are respectively electrically connected to multiple devices under test, or, after the multiple multiplexers 133 of the intermodulation test device 100 are electrically connected to multiple signal ports of the same device under test. The controller starts the intermodulation test process.

[0132] Step S1133, after controlling one of the signal generators to complete the test of one frequency point, automatically switch to the next frequency point until the tests of all frequency points within the predetermined frequency band are completed;

[0133] In the intermodulation test device 100, the two signal generators 124 of the signal source 120 can generate two carrier signals at different frequencies within the same frequency band. When performing an intermodulation test on a device under test, the controller controls the first signal generator 1241 to generate a first carrier signal with a locked frequency, and at the same time controls the second signal generator 1242 to sequentially switch the operating frequency within a predetermined frequency band to generate a second carrier signal at different frequencies. The predetermined frequency band is within the operating frequency band of the signal source 120. The first carrier signal and the second carrier signal are combined to generate a mixed signal. Since the frequency of the second carrier signal continuously switches, the mixed signal also continuously changes. The continuously changing mixed signal is output as a test signal to the device under test to perform a third-order intermodulation test on the device under test for the corresponding target frequency band.

[0134] When the intermodulation test device 100 completes the intermodulation test based on one of the frequencies of the second signal generator 1242, the controller will control the second signal generator 1242 to switch to the next frequency and continue the intermodulation test until the intermodulation test for all frequencies within the predetermined frequency band is completed.

[0135] For example, the controller controls the first signal source 121 to operate at 1800 - 1900 MHz, and controls the first signal generator 1241 to operate so that the frequency of the first carrier signal is fixed at 1805 MHz; the controller controls the second signal generator 1242 so that the second carrier signal operates at 1880 MHz but steps down by 1 MHz. The frequency of the second carrier signal sweeps down sequentially from 1880, 1979, 1878... 1825 MHz. The first carrier signal and the second carrier signal are combined to continuously generate different mixed signals, and the multiplexer 133 outputs the mixed signals as test signals to the device under test to continuously perform an intermodulation test on the device under test.

[0136] Alternatively, the controller controls the second signal generator 1242 to operate so that the frequency of the second carrier signal is fixed at 1880 MHz; the controller controls the first signal generator 1241 to operate so that the frequency of the first carrier signal operates at 1805 MHz but steps up by 1 MHz. The frequency of the first carrier signal sweeps up from 1805, 1806, 1807... 1832.5 MHz. The first carrier signal and the second carrier signal are combined to continuously generate different mixed signals, and the multiplexer 133 outputs the mixed signals as test signals to the device under test to continuously perform an intermodulation test on the device under test.

[0137] Based on any embodiment of the intermodulation test method of the present invention, please refer to Figure 5 , in the step of polling and collecting the reflected signals generated by each test signal through the signal acquisition unit, the following specific steps are included:

[0138] Step S1310: Amplify the power of the reflected signals uploaded by each multiplexer through a signal amplifier.

[0139] The multiplexer 133 further includes an RX port. After the multiplexer 133 outputs a test signal to the device under test to perform an intermodulation test, the device under test will generate a reflected signal. The multiplexer 133 receives this reflected signal and outputs it to the signal amplifier 141 through the RX port. Subsequently, the signal amplifier 141 amplifies the power of the reflected signal. The signal amplifier 141 amplifies the power of the reflected signal to increase the signal strength, facilitating subsequent processing and analysis, thereby improving the accuracy and reliability of the intermodulation test.

[0140] Multiple multiplexers 133 of the intermodulation test device 100 all upload the received reflected signals to the signal amplifier 141, enabling the signal amplifier 141 to amplify the power of the reflected signals output by each multiplexer 133.

[0141] Step S1320: Control the polling controller to perform polling switching through a digital receiver to receive the power-amplified reflected signals of each path at different times.

[0142] The digital receiver 143 is used to control the working state of the polling controller 142. Under the control of the digital receiver 143, the polling controller 142 performs a polling operation to receive, in a time-division multiplexing manner, only the reflected signal output by a certain multiplexer 133 among the multiple multiplexers 133 at any moment, aiming to avoid the mixing and interference of the reflected signals output by the multiple multiplexers 133.

[0143] The polling controller 142 sequentially outputs the reflected signals received at different times to the digital receiver 143. The digital receiver 143 is responsible for converting these reflected signals into digital signals for subsequent analysis by the controller. For example, the digital receiver 143 precisely measures and analyzes signal characteristics such as the amplitude, frequency, and phase of the reflected signal through a series of steps including analog-to-digital conversion, down-conversion, quadrature demodulation, and digital signal processing, and converts them into digital form. These digital signals provide an accurate and reliable data basis for subsequent analysis by the controller.

[0144] Based on any embodiment of the intermodulation test method of the present invention, in the step of controlling one or more signal sources to respectively generate carrier signals at two different frequency points within their respective target frequency bands, the following specific steps are further included:

[0145] Step S1140: Connect to an external reference source through a reference source interface and receive the calibration signal of the external reference source to calibrate the frequency accuracy of the signal source.

[0146] The intermodulation test device 100 is provided with a reference source interface for electrically connecting to an external reference source, and the reference source interface is disposed on the controller. Based on the high-precision clock signal provided by the external reference source, the controller provides a high-precision clock signal for multiple signal sources 120 of the intermodulation test device 100, ensuring the frequency accuracy and stability of the multiple signal sources 120, thereby improving the test accuracy of the intermodulation test device 100. Specifically, it is recommended that the external reference source can be a temperature-controlled crystal oscillator. The temperature-controlled crystal oscillator places the crystal in a constant temperature environment through a temperature control system, reducing the influence of ambient temperature changes on the oscillation frequency and providing ultra-high frequency stability and accuracy. The controller utilizes this high-precision clock signal to achieve precise control of the multiple signal sources 120, ensuring the accuracy and reliability of the intermodulation test.

[0147] Based on any embodiment of the intermodulation test method of the present invention, in the step of the signal acquisition unit polling and acquiring the reflected signals generated by each test signal, the following specific steps are further included:

[0148] Step S1330, controlling the local oscillator to generate a local oscillator signal, mixing the local oscillator signal with the reflected signal to generate an intermediate frequency signal, and outputting the intermediate frequency signal to the digital controller;

[0149] After the controller controls the intermodulation test device 100 to generate a high-frequency test signal, the device under test will correspondingly return a high-frequency reflected signal. Since the frequency of the high-frequency reflected signal is relatively high, it is difficult to directly process these high-frequency signals. In response, the controller controls the local oscillator 145 to generate a local oscillator signal, and mixes the local oscillator signal with the high-frequency reflected signal received by the polling controller 142 to convert the high-frequency reflected signal into an intermediate frequency signal, thereby reducing the frequency of the reflected signal and making it easier for the subsequent digital receiver 143 to perform digital processing on the intermediate frequency signal.

[0150] The digital receiver 143 converts the intermediate frequency signal into a digital signal through its analog-to-digital converter (ADC). The analog-to-digital converter samples the intermediate frequency signal at a certain sampling rate and quantizes it into a digital signal. The sampling rate is usually set according to the bandwidth and frequency characteristics of the intermediate frequency signal to ensure the integrity and accuracy of the signal. During the analog-to-digital conversion process, the selection of the sampling rate and quantization bits has an important impact on the quality of the digital signal. A higher sampling rate and quantization bits can provide higher signal resolution and dynamic range, thereby improving the intermodulation test accuracy.

[0151] Based on any embodiment of the intermodulation test method of the present invention, after the step of generating test data based on the reflected signal, the following specific steps are further included:

[0152] Step S1400: Perform data communication with an external control device through a communication interface to upload the test data to the external control device.

[0153] The controller performs data communication with an external control device through a communication interface. Specifically, the controller submits test data to the external control device through the communication interface. This process not only realizes effective data interaction with the external control device but also ensures the accurate transmission and sharing of test data. Through the communication interface, the controller can efficiently transmit test data to the external control device, facilitating further analysis and processing of the data. In addition, the communication interface supports multiple communication protocols and data formats to meet the requirements of different external control devices, further enhancing the compatibility and flexibility of the system.

[0154] Thus, based on the intermodulation test method of the present invention, the intermodulation test device 100 is controlled to perform intermodulation tests on multiple frequency bands and multiple ports to improve the intermodulation test efficiency.

[0155] The present invention also provides an intermodulation test network. The intermodulation test network forms a test network by networking multiple intermodulation test devices 100 described above to improve the intermodulation test efficiency.

[0156] In a typical embodiment of the present invention, refer to Figure 6 , the intermodulation test device 100 includes a control device 310, at least one switch 320, and multiple intermodulation test devices 100. The intermodulation test device 100 is the multi-port multi-band intermodulation test device 100 described above. For the specific structure of the intermodulation test device 100, please refer to the above. To save space, it will not be elaborated here.

[0157] Specifically, the intermodulation test network has multiple switches 320. These multiple switches 320 are cascaded with each other. The multiple switches 320 include a main switch 321 and sub-switches 322. The main switch 321 is electrically connected to the control device 310 and the sub-switches 322 respectively, and the sub-switches 322 are electrically connected to multiple intermodulation test devices 100. In this embodiment, the main switch 321 can be connected to multiple sub-switches 322 at the same time, and each sub-switch 322 can be electrically connected to multiple intermodulation test devices 100 at the same time.

[0158] In another embodiment, there is one switch 320 in the intermodulation test network, and all the intermodulation test devices 100 in the intermodulation test network share the same switch 320.

[0159] The switch 320 is plugged into the communication interface of the intermodulation test device 100 through a cable, enabling the intermodulation test device 100 to perform data communication with the control device 310 through the switch 320.

[0160] In a typical embodiment of the present invention, the control device 310 can control one or more intermodulation test devices 100 to work simultaneously via the switch 320, and can enable the multiple intermodulation test devices 100 to generate the same test signal simultaneously to perform unified testing on a number of test pieces in the same batch, so as to improve the test efficiency for a large number of test pieces.

[0161] Specifically, the control device 310 sends test instructions to the multiple intermodulation test devices 100 through the switch 320. In this embodiment, the control device 310 can send the test instructions to all the intermodulation test devices 100 in a broadcast manner, or the control device 310 sends test instructions to each intermodulation test device 100 individually.

[0162] After the controller of the intermodulation test device 100 receives the test instructions, the controller controls the intermodulation test device 100 to work based on the test instructions, so that the intermodulation test device 100 generates multiple paths of test signals. Each multiplexer 133 of the intermodulation test device 100 receives one path of test signal, and the multiple multiplexers 133 output the corresponding test signals to the signal ports of the test pieces to perform intermodulation testing. The test pieces generate reflected signals based on the test signals. The multiplexer 133 receives the reflected signals output from the corresponding signal ports, and the multiplexer 133 outputs the reflected signals to the digital receiver 143. The digital receiver 143 converts the reflected signals into digital signals and outputs the digital signals to the controller. The controller generates test data based on the digital signals. The controller generates multiple test data based on the reflected signals uploaded by the multiple multiplexers 133.

[0163] In the intermodulation test device 100, the controller packs the multiple test data and uploads them to the control device 310 through the switch 320. After the control device 310 receives the test data output by each intermodulation device, it analyzes these test data and generates an intermodulation test report for the corresponding test pieces based on these test data. The user can intuitively understand the intermodulation test results of the test pieces based on the intermodulation test report. This process not only realizes the efficient transmission and processing of data, but also provides the user with an intuitive and convenient way to display the test results by generating a detailed test report, which is convenient for the user to quickly understand and evaluate the performance of the test pieces.

[0164] In one embodiment, a reference source (not shown) is provided in the control device 310. In the intermodulation test network, the reference source integrated in the control device 310 ensures the consistency of the intermodulation test network by providing high-precision clock synchronization and frequency reference, outputs a unified reference signal for all the intermodulation test devices 100, and the reference signal provided by the reference source is used to calibrate and compare other voltage signals to ensure the accurate operation of the circuit. The reference source is also used to lock the local oscillator frequencies of the intermodulation test devices 100 to eliminate the superposition of frequency offset and phase noise among the intermodulation test devices 100. In addition, the reference source is also used to calibrate various test devices and instruments to ensure the accuracy and stability of these devices or instruments. In the signal processing and control system, the stable reference voltage signal provided by the reference source helps to improve the performance and reliability of the system. In a further embodiment, nanosecond-level time synchronization can also be achieved simultaneously through the IEEE 1588 protocol or pulse triggering to ensure that the timing of the intermodulation test devices 100 is strictly aligned.

[0165] The present invention also provides an intermodulation test network control method. This intermodulation test network control method is implemented based on the intermodulation test network described above, and the control device 310 of the intermodulation test network is used to execute the intermodulation test network control method. Through the intermodulation test network control method, multiple intermodulation test devices 100 of the intermodulation test network can be well controlled to execute the intermodulation test task, improving the intermodulation test efficiency. In a typical embodiment of the present invention, please refer to Figure 7 , the intermodulation test network control method includes the following specific steps:

[0166] Step S3100: Send intermodulation test instructions to multiple intermodulation test devices through a switch;

[0167] In the intermodulation test network, multiple intermodulation test devices 100 are respectively connected to corresponding test pieces to be tested. The control device 310 pre-packages the target frequency band information for intermodulation test in the test instructions, and then sends the test instructions to each intermodulation test device 100 in the intermodulation test network through the switch 320. This process not only realizes the centralized control of multiple intermodulation test devices 100, but also ensures the accurate transmission and execution of the test instructions, improving the efficiency and accuracy of the test. In this way, the control device 310 can flexibly manage and schedule multiple intermodulation test devices 100 to adapt to different scales and complexities of test requirements.

[0168] Step S3200: Enable the intermodulation test device to control one or more signal sources to generate carrier signals with two different frequency points within their respective target frequency bands based on the test instructions;

[0169] After the controller of the intermodulation test device 100 receives the test instruction sent by the control device 310, the controller parses the target frequency band information from the test instruction, and the controller controls the corresponding signal source 120 to generate carrier signals at two different frequencies within the target frequency band based on the target frequency band information. Specifically, when the test instruction contains one target frequency band information, the controller controls the signal source 120 corresponding to the one target frequency band to work; when the test instruction contains two or more target frequency band information, the controller controls the signal sources 120 corresponding to the two or more target frequency bands to work simultaneously.

[0170] For the specific content of this step S3200, reference can be made to step S1100 above. To save space here, it will not be elaborated.

[0171] Multiple intermodulation test devices 100 in the intermodulation test network all receive the test instruction, so that the multiple intermodulation test devices 100 synchronously execute the same step S3200, so as to synchronously implement the intermodulation test for the intermodulation test network.

[0172] Step S3300, combine the two carrier signals into a mixed wave signal through the signal cross network of the intermodulation test device and allocate it into multiple test signals, so that each test signal contains a mixed wave signal of one or more frequency bands to access the signal port of an external passive device;

[0173] For the specific content of this step S3300, reference can be made to step S1200 above. To save space here, it will not be elaborated.

[0174] Step S3400, poll and collect the reflected signals generated by each test signal through the signal acquisition unit of the intermodulation test device, and the intermodulation test device generates test data based on the reflected signals;

[0175] For the specific content of this step S3400, reference can be made to step S1300 above. To save space here, it will not be elaborated.

[0176] Step S3500, based on the switch, receive the test data uploaded by the multiple intermodulation test devices and generate an intermodulation test report based on the multiple test data;

[0177] The controller of the intermodulation test device 100 packs multiple pieces of test data and uploads them to the control device 310 through the switch 320. After receiving the test data output by multiple intermodulation devices, the control device 310 analyzes these test data and generates an intermodulation test report for the corresponding device under test based on these test data. The user can intuitively understand the intermodulation test results of the device under test based on the intermodulation test report. This process not only realizes the efficient transmission and processing of data, but also provides the user with an intuitive and convenient way to display the test results by generating a detailed test report, facilitating the user to quickly understand and evaluate the performance of the device under test.

[0178] Specifically, the controller uploads the packed test data to the control device 310 through the switch 320. The switch 320 plays a key role in the intermodulation test network, ensuring the efficient transmission and stable connection of data. After receiving the test data uploaded by multiple intermodulation test devices 100, the control device 310 analyzes these data. The analysis process includes the statistics, comparison, and evaluation of the test data to determine the intermodulation performance of the device under test. Based on the analysis results, the control device 310 generates a corresponding intermodulation test report. For example, the content of the intermodulation report includes a detailed analysis of the test data, chart display, and statistical information to help the user intuitively understand the test results.

[0179] Based on any embodiment of the intermodulation test network control method of the present invention, for the structure and control logic of the intermodulation test device 100 involved in the intermodulation test network control method of the present invention, reference can be made to the discussion of the intermodulation test device 100 and the discussion of the intermodulation test method implemented based on the intermodulation test device 100 above. To save space, it will not be elaborated here.

[0180] Based on any embodiment of the intermodulation test network control method of the present invention, please refer to Figure 8 , and further includes the following specific steps:

[0181] Step S3600, real-time monitor the operating status of each intermodulation test device, where the operating status includes the frequency stability index of the signal source, the power distribution of the signal crossover network, and the signal acquisition efficiency of the signal acquisition unit;

[0182] The control device 310 has the function of real-time monitoring the operating status of each intermodulation test device 100, where the operating status includes the frequency stability index of the signal source 120, the power distribution information of the signal crossover network, and the acquisition efficiency of the reflected signals of the signal acquisition unit.

[0183] The frequency stability index of the signal source 120 reflects the stability of the output frequency of the signal source 120, which is crucial for the accuracy of the intermodulation test. Frequency stability refers to the magnitude of the deviation value of the output frequency of the signal generator 124 relative to the preset frequency within a preset duration when the external environment remains unchanged.

[0184] The power distribution information of the signal cross-network involves the power distribution of signals on devices such as the power amplifier module 134, combiner 131, power splitter module 132, and multiplexer 133 in the signal cross-network, ensuring the power balance of signals on each device and avoiding test errors caused by uneven power. Through the power distribution network, power is evenly and non-interferingly distributed to multiple independent devices simultaneously, enabling each device to obtain signals with corresponding power and the same phase.

[0185] The signal acquisition efficiency of the signal acquisition unit reflects the speed and accuracy of the acquisition of reflected signals, affecting the quality of test data and the efficiency of the test.

[0186] Step S3700, when the operating state of any intermodulation test device is detected to be abnormal, automatically adjust the test parameters of the corresponding intermodulation test device or suspend its test task;

[0187] When the control device 310 detects that the operating state of any intermodulation test device 100 is abnormal, the control device 310 automatically adjusts the test parameters of the corresponding intermodulation test device 100 or suspends its test task by sending a targeted adjustment instruction or stop instruction.

[0188] For example, if the frequency stability index of the signal source 120 exceeds the preset frequency, the control device 310 sends a targeted adjustment instruction or stop instruction to instruct the controller of the corresponding intermodulation test device 100 to adjust the frequency or suspend the test task of the signal source 120 to ensure the accuracy of the test. Specifically, the controller adjusts the output frequency or power of the signal source 120 based on the adjustment instruction to restore it to the normal range. Or, the controller controls the intermodulation test device 100 where the controller is located to stop working based on the stop instruction to prevent the intermodulation test device 100 from obtaining incorrect intermodulation test data.

[0189] For another example, if the power distribution information of the signal cross-network shows uneven power, the control device 310 sends a targeted adjustment instruction to instruct the controller of the corresponding intermodulation test device 100 to adjust the power distribution parameters of the signal cross-network to ensure the power balance of signals on each device in the signal cross-network. Specifically, the control device 310 adjusts the power distribution ratio of each device in the power distribution network based on the adjustment instruction sent by the control device 310 to make the power of signals on each device in the signal cross-network reach balance.

[0190] For another example, if the signal acquisition efficiency of the signal acquisition unit is low, the control device 310 issues an adjustment instruction in a targeted manner to instruct the controller of the corresponding intermodulation test device 100 to optimize the acquisition parameters and improve the acquisition efficiency. Specifically, based on the adjustment instruction issued by the control device 310, the control device 310 adjusts parameters such as the sampling rate and quantization bits of the digital receiver 143 of the acquisition unit to improve the acquisition speed and accuracy of the multiplexer 133.

[0191] Thus, the control device 310 issues an adjustment instruction or a stop instruction in a targeted manner to control the intermodulation test device 100 to adjust the operating state in real time, thereby improving the accuracy and reliability of the intermodulation test.

[0192] Based on any embodiment of the intermodulation test network control method of the present invention, in the step of sending a test instruction to multiple intermodulation test devices through a switch, the following steps are included:

[0193] Step S3110, obtain the device parameters of the external passive device, extract the corresponding target frequency band information from the calibration database based on the device parameters, and generate the test instruction based on the target frequency band information:

[0194] The control device 310 can obtain the device parameters of the device under test, and these parameters include but are not limited to the intermodulation characteristics, frequency range, power capacity, etc. of the device. The control device 310 extracts the corresponding target frequency band information from the calibration database based on the device parameters. The calibration database stores the intermodulation characteristic data of different passive devices in different frequency bands, and these intermodulation characteristic data are obtained through pre-tests and calibrations. The control device 310 generates the test instruction based on the target frequency band information. Thus, the control device 310 can adaptively adjust the target frequency band information in the test instruction according to the specific device parameters of the device under test, thereby improving the accuracy and efficiency of the test, and can also improve the automation degree of the intermodulation test network and reduce manual labor.

[0195] Based on any embodiment of the intermodulation test network control method of the present invention, the following steps are included: Step S3800, send a calibration signal to each intermodulation test device based on a reference source to calibrate the frequency accuracy of the signal sources of each intermodulation test device;

[0196] The control device 310 sends calibration signals to each intermodulation test device 100 based on a reference source to calibrate the frequency accuracy of the signal source 120 of each intermodulation test device 100. Specifically, the control device 310 uses the high-precision clock signal provided by the reference source to generate calibration signals and sends these calibration signals to each intermodulation test device 100. These calibration signals are used to adjust the output frequency of the signal source 120 of the intermodulation test device 100 to ensure that it is consistent with the frequency of the reference source, thereby improving the frequency accuracy. In this way, the control device 310 can ensure that the signal source 120 of each intermodulation test device 100 outputs accurate carrier signals during the intermodulation test, reduce test errors caused by frequency deviation, and improve the accuracy and reliability of the test results. For example, during the third-order intermodulation test, accurate carrier signals can effectively avoid intermodulation test errors caused by frequency deviation, thereby improving the accuracy and reliability of the test.

[0197] Based on any embodiment of the intermodulation test method of the present invention, in the step of enabling the intermodulation test device to control one or more signal sources to respectively generate carrier signals of two different frequency points within their respective target frequency bands based on the test instruction, the following steps are included:

[0198] Step S3210, the intermodulation test device controls two signal generators of the signal source corresponding to the target frequency band to work based on the test instruction, and the two signal transmitters respectively generate carrier signals of two different frequency points;

[0199] In the test instruction sent by the control device 310 received by the controller of the intermodulation test device 100, the controller correspondingly controls multiple signal sources 120 to work at different frequency points based on the test instruction. The controller controls two signal generators 124 of the signal source 120 to respectively generate two carrier signals, and the two carrier signals work at different frequency points within the same frequency band.

[0200] Based on any embodiment of the intermodulation test method of the present invention, please refer to Figure 9 , in the step of enabling the intermodulation test device to control one or more signal sources to respectively generate carrier signals of two different frequency points within their respective target frequency bands based on the test instruction, the following steps are included:

[0201] Step S3220, the intermodulation test device receives a test instruction, and the test instruction includes one or more target frequency bands;

[0202] For the specific content of step S3220, please refer to step S1120 above. To save space, it will not be elaborated here.

[0203] Step S3230: Based on one or more target frequency bands in the detection information, the intermodulation test device controls the one or more corresponding signal sources to generate corresponding carrier signals respectively.

[0204] For the specific content of step S3230, please refer to step S1130 above. To save space, it will not be elaborated here.

[0205] Based on any embodiment of the intermodulation test method of the present invention, in the step where the intermodulation test device controls one or more corresponding signal sources to generate corresponding carrier signals based on the one or more target frequency band information, the following steps are included:

[0206] Step S3231: When the test instruction includes one target frequency band information, the intermodulation test device controls one of the signal generators of the signal source corresponding to this target frequency band to fixedly operate at the same frequency point, and the other signal generator continuously changes its operating frequency point.

[0207] For the specific content of step S3231, please refer to step S1131 above. To save space, it will not be elaborated here.

[0208] Based on any embodiment of the intermodulation test method of the present invention, please refer to Figure 10 , in the step where the intermodulation test device controls one of the signal generators of the signal source corresponding to this target frequency band to fixedly operate at the same frequency point, and the other signal generator continuously changes its operating frequency point, the following steps are further included:

[0209] Step S3232: The intermodulation test device controls the signal source to lock two different frequency points within the target frequency band and starts the test process for the device under test.

[0210] For the specific content of step S3232, please refer to step S1132 above. To save space, it will not be elaborated here.

[0211] Step S3233: After the intermodulation test device controls one of the signal generators to complete the test of one frequency point, it automatically switches to the next frequency point until the tests of all frequency points within the predetermined frequency band are completed.

[0212] For the specific content of step S3233, please refer to step S1133 above. To save space, it will not be elaborated here.

[0213] Based on any embodiment of the intermodulation test method of the present invention, please refer to Figure 11 , in the step of polling and collecting the reflected signals generated by each test signal through the signal acquisition unit of the intermodulation test device, the following steps are included:

[0214] The intermodulation test device described in step S3410 amplifies the power of the reflected signals uploaded by each multiplexer through a signal amplifier;

[0215] For the specific content of step S3410, please refer to step S1310 above. To save space, it will not be elaborated here.

[0216] The intermodulation test device described in step S3420 controls the polling controller to perform polling switching through a digital receiver, so as to receive the reflected signals after power amplification on each path at different times.

[0217] For the specific content of step S3420, please refer to step S1320 above. To save space, it will not be elaborated here.

[0218] In summary, the intermodulation test device of the present invention has multiple test ports and multiple test frequency bands, so that the intermodulation test device can simultaneously perform third-order or higher-order intermodulation tests on multiple test pieces to be tested or multiple signal ports of the same test piece to be tested, so as to improve the intermodulation test efficiency.

[0219] The above description is only a preferred embodiment of the present invention and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features having similar functions in the present invention.

[0220] Although the subject matter has been described in language specific to structural features and / or methodological acts, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. On the contrary, the specific features and acts described above are merely example forms of implementing the claims.

Claims

1. A multi-port multi-band intermodulation test method, characterized in that: The steps include: Control one or more signal sources to respectively generate carrier signals of two different frequencies within respective target frequency bands; The carrier signals are combined into mixed signals through a signal cross network, and distributed into multiple test signals, so that each test signal contains mixed signals of one frequency band or multiple frequency bands, so as to be connected to the signal port of the external passive device; The signal acquisition unit polls and acquires the reflected signals generated by each test signal, and generates test data based on the reflected signals.

2. The method according to claim 1, characterized in that The step of controlling one or more signal sources to respectively generate carrier signals of two different frequencies within respective target frequency bands comprises the following steps: Two signal generators of a signal source corresponding to a target frequency band are controlled to work, and the two signal generators respectively generate carrier signals of two different frequencies.

3. The method according to claim 2, characterized in that The step of controlling one or more signal sources to respectively generate carrier signals of two different frequencies within respective target frequency bands includes the following specific steps: Receiving a test instruction, wherein the test instruction includes one or more target frequency band information corresponding to the intermodulation test; Based on the one or more target frequency band information, the corresponding one or more signal sources are controlled to generate corresponding carrier signals.

4. The method according to claim 3, characterized in that The step of controlling one or more corresponding signal sources to generate corresponding carrier signals based on the one or more target frequency band information includes the following steps: When the test instruction includes a target frequency band information, one of the signal generators of the signal source corresponding to the target frequency band is controlled to work at the same frequency point, and the other signal generator continuously changes its working frequency point.

5. The method according to claim 4, characterized in that The step of controlling one of the signal generators of the signal source corresponding to the target frequency band to work at the same frequency point and the other signal generator to continuously change its working frequency point also includes the following steps: The control signal source is used to lock two different frequency points in the target frequency band and start the test process for the device to be tested. After one of the signal generators is controlled to complete the test of one frequency point, it automatically switches to the next frequency point until the test of all frequency points in the predetermined frequency band is completed.

6. The method according to claim 1, characterized in that The step of collecting the reflected signals generated by each test signal through polling by the signal collection unit includes the following steps: The reflected signals uploaded by each multiplexer are power-amplified by a signal amplifier; The polling controller is controlled by a digital receiver to perform polling switching so as to receive the reflected signals of each path after power amplification at different times.

7. The method according to claim 1, characterized in that The step of controlling one or more signal sources to respectively generate carrier signals of two different frequencies within respective target frequency bands further includes the following steps: It is connected to an external reference source through a reference source interface and receives a correction signal from the external reference source to correct the frequency accuracy of the signal source.

8. The method according to claim 6, characterized in that The step of collecting the reflected signals generated by each test signal through polling by the signal collection unit also includes the following steps: The local oscillator source is controlled to generate a local oscillator signal, the local oscillator signal is mixed with the reflected signal to generate an intermediate frequency signal, and the intermediate frequency signal is output to the digital controller.

9. The method according to claim 1, characterized in that After the step of generating test data based on the reflection signal, the following steps are also included: Data communication is performed with the external control device via the communication interface to upload the test data to the external control device.

10. A multi-port multi-band intermodulation test device, characterized in that: It comprises a plurality of signal sources, a signal cross network, a signal acquisition unit, and a controller, wherein the controller is used to execute the method according to any one of claims 1 to 9.

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