Multichannel signal acquisition device

Abstract

The application provides a kind of multichannel signal acquisition device, belongs to signal acquisition technical field, multichannel signal acquisition device includes multiple signal acquisition branches, each signal acquisition branch includes a directional antenna and the radio frequency channel connected with directional antenna;Baseband module is connected with multiple signal acquisition branches, for receiving the bandwidth signal that each signal acquisition branch is collected by radio frequency channel through directional antenna;Wherein, radio frequency channel includes first band-pass filter, second band-pass filter, first radio frequency switch and gain adjustment module, first radio frequency switch is used to select first band-pass filter or second band-pass filter and gain adjustment module intercommunication, bandwidth signal is filtered and handled and gain adjustment processing, to store the bandwidth signal after filtering and gain adjustment processing for baseband module.In this process, the bandwidth signal collected can be used for testing in laboratory environment, while reducing the test cost, improve the test efficiency.

Description

Technical Field

[0001] This invention relates to the field of signal acquisition technology, and in particular to a multi-channel signal acquisition device. Background Technology

[0002] With the increasing popularity of consumer electronics, Bluetooth headsets are now commonplace. In reality, in crowded or multi-device environments (such as subways, shopping malls, and offices), Bluetooth headsets are prone to connection interruptions or audio packet loss. When multiple devices are used on the same frequency, signal interference can occur, leading to data packet loss, increased latency, and dropped connections. Even without a complete disconnection, issues such as audio jitter, static noise, and brief periods of silence may occur.

[0003] To verify the level of interference of the equipment in the current operating environment, testers need to conduct on-site tests. However, on-site testing requires setting up the test environment and placing the test equipment, which is time-consuming, labor-intensive, and has relatively low testing efficiency. Summary of the Invention

[0004] This invention provides a multi-channel signal acquisition device to solve the shortcomings of existing technologies that require setting up a test environment and placing test equipment for on-site testing, which is time-consuming, labor-intensive, and has low testing efficiency. It enables testing in a laboratory environment, reducing testing costs while improving testing efficiency.

[0005] This invention provides a multi-channel signal acquisition device, comprising the following modules: Multiple signal acquisition branches, each of which includes a directional antenna and a radio frequency channel connected to the directional antenna; The baseband module is connected to multiple signal acquisition branches and is used to receive the bandwidth signal acquired by the directional antenna through the radio frequency channel in each of the signal acquisition branches. The radio frequency channel includes a first bandpass filter, a second bandpass filter, a first radio frequency switch, and a gain adjustment module. The first radio frequency switch is used to select the first bandpass filter or the second bandpass filter to be connected to the gain adjustment module, so as to perform filtering and gain adjustment processing on the bandwidth signal, so that the baseband module can store the bandwidth signal after the filtering and gain adjustment processing.

[0006] According to a multi-channel signal acquisition device provided by the present invention, each of the radio frequency channels further includes: The second radio frequency switch is connected in series between the directional antenna, the input terminal of the first bandpass filter, and the input terminal of the second bandpass filter; The input terminal of the second RF switch is connected to the directional antenna, the first output terminal of the second RF switch is connected to the input terminal of the first bandpass filter, and the second output terminal of the second RF switch is connected to the input terminal of the second bandpass filter. The second radio frequency switch operates synchronously with the first radio frequency switch to select whether the first bandpass filter or the second bandpass filter is connected to the directional antenna.

[0007] According to a multi-channel signal acquisition device provided by the present invention, each of the radio frequency channels further includes: The third radio frequency switch, the input terminal of which is connected to the output terminal of the gain adjustment module; A third bandpass filter, wherein the input terminal of the third bandpass filter is connected to the first output terminal of the third radio frequency switch; A fourth bandpass filter, the input of which is connected to the second output of the third radio frequency switch; A fourth radio frequency switch, wherein the first input terminal of the fourth radio frequency switch is connected to the output terminal of the third bandpass filter, the second input terminal of the fourth radio frequency switch is connected to the output terminal of the fourth bandpass filter, and the output terminal of the fourth radio frequency switch is connected to the baseband module; The first bandpass filter and the third bandpass filter are bandpass filters of the same model, the second bandpass filter and the fourth bandpass filter are bandpass filters of the same model, and the third RF switch and the fourth RF switch operate synchronously with the first RF switch to select the same model of bandpass filter to work.

[0008] According to the present invention, a multi-channel signal acquisition device is provided, wherein the baseband module includes: A multi-channel analog-to-digital converter, wherein the multiple input terminals of the multi-channel analog-to-digital converter are connected one-to-one with the output terminals of the multiple signal acquisition branches, and is used to sample the bandwidth signal output by the radio frequency channel based on the working clock signal to obtain the target bandwidth signal; The programmable logic chip is connected to the output of the multiplexer analog-to-digital converter; A storage chip, connected to the programmable logic chip; The programmable logic chip is used to store the target bandwidth signal in the memory chip.

[0009] According to the present invention, a multi-channel signal acquisition device is provided, the multi-channel signal acquisition device further includes: Storage array; A disk array card, connected to the storage array; The data processing platform is connected to the programmable logic chip and the disk array card via a high-speed bus, and is used to read the target bandwidth signal cached on the storage chip and store the read target bandwidth signal in the storage array.

[0010] According to the present invention, a multi-channel signal acquisition device is provided, the multi-channel signal acquisition device further includes: Reference clock source, used to generate a reference clock signal; A frequency synthesizer, connected to the reference clock source, is used to output a working clock signal based on the reference clock signal; The baseband module also includes: A clock generation module is connected to the programmable logic chip and the multiplexer, respectively, for receiving the working clock signal and sending the working clock signal to the programmable logic chip and the multiplexer.

[0011] According to a multi-channel signal acquisition device provided by the present invention, the passband frequency of the first bandpass filter is between 2400MHz and 2500MHz; The passband frequency of the second bandpass filter is between 5150MHz and 5895MHz.

[0012] According to the present invention, a multi-channel signal acquisition device is provided, the multi-channel signal acquisition device further includes: Operating mode input module, the operating mode input module being connected to the first radio frequency switch, is used to acquire the operating mode of the multi-channel signal acquisition device; and Based on the operating mode input module, the first RF switch is controlled to select either the first bandpass filter or the second bandpass filter to connect to the gain adjustment module.

[0013] According to a multi-channel signal acquisition device provided by the present invention, the bandwidth signals acquired by different signal acquisition branches are ping-pong stored in the memory chip.

[0014] According to the present invention, a multi-channel signal acquisition device is provided, wherein the multi-channel analog-to-digital converter and the programmable logic chip are integrated.

[0015] This invention provides a multi-channel signal acquisition device. By setting a first bandpass filter and a second bandpass filter selectable by a first RF switch in the RF channel, the device can flexibly switch between operating in different target frequency bands. Before entering the gain adjustment module, the signal undergoes precise bandpass filtering. This effectively filters out strong out-of-band interference signals, preventing these useless signals from causing saturation suppression effects on the gain adjustment module and subsequent circuits. Furthermore, in conjunction with the gain adjustment module, it ensures that the useful signal entering the baseband module has not only moderate power but also a high signal-to-noise ratio. Ultimately, the baseband module can store high-quality, high-fidelity bandwidth signals, providing reliable raw data for subsequent precise analysis of signal interference problems in complex electromagnetic environments. This achieves efficient and accurate acquisition of multiple channels and multiple frequency bands of signals in complex environments.

[0016] During this process, the collected bandwidth signal can be used for testing in a laboratory environment, which reduces testing costs and improves testing efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is one of the topological schematic diagrams of the multi-channel signal acquisition device provided by the present invention.

[0019] Figure 2 This is a schematic diagram of the topology of the radio frequency channel provided by the present invention.

[0020] Figure 3 This is the second topological schematic diagram of the multi-channel signal acquisition device provided by the present invention.

[0021] Figure label: 10: Signal acquisition branch; 101: Directional antenna; 102: RF channel; 1021: First bandpass filter; 1022: Second bandpass filter; 1023: First RF switch; 1024: Gain adjustment module; 1025: Second RF switch; 1026: Third RF switch; 1027: Third bandpass filter; 1028: Fourth bandpass filter; 1029: Fourth RF switch; 20: Baseband module; 201: Multiplexer analog-to-digital converter; 202: Programmable logic chip; 203: Memory chip; 204: Clock generation module; 30: Memory array; 40: Disk array card; 50: Data processing platform; 60: Reference clock source; 70: Frequency synthesizer. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] The following is combined Figures 1 to 3 The multi-channel signal acquisition device of the present invention is described.

[0024] Figure 1 This is one of the topological schematic diagrams of the multi-channel signal acquisition device provided by the present invention, such as... Figure 1 and Figure 2 As shown, the multi-channel signal acquisition device includes the following modules: Multiple signal acquisition branches 10, each signal acquisition branch 10 includes a directional antenna 101 and a radio frequency channel 102 connected to the directional antenna 101; The baseband module 20 is connected to multiple signal acquisition branches 10 and is used to receive the bandwidth signal acquired by the radio frequency channel 102 in each signal acquisition branch 10 through the directional antenna 101. The radio frequency channel 102 includes a first bandpass filter 1021, a second bandpass filter 1022, a first radio frequency switch 1023, and a gain adjustment module 1024. The first radio frequency switch 1023 is used to select the first bandpass filter 1021 or the second bandpass filter 1022 to connect to the gain adjustment module 1024, so as to filter and adjust the bandwidth signal, so that the baseband module 20 can store the bandwidth signal after filtering and gain adjustment.

[0025] In this embodiment, by setting a first bandpass filter 1021 and a second bandpass filter 1022 selectable by a first RF switch 1023 in the RF channel 102, the device can flexibly switch between operating in different target frequency bands. The signal undergoes precise bandpass filtering before entering the gain adjustment module 1024. This effectively filters out strong out-of-band interference signals, preventing these useless signals from causing saturation suppression effects on the gain adjustment module 1024 and subsequent circuits. Furthermore, in conjunction with the gain adjustment module 1024, it ensures that the useful signal entering the baseband module 20 has not only moderate power but also a high signal-to-noise ratio. Ultimately, the baseband module 20 can store high-quality, high-fidelity bandwidth signals, providing reliable raw data for subsequent precise analysis of signal interference problems in complex electromagnetic environments, thereby achieving efficient and accurate acquisition of multiple channels and multiple frequency bands of signals in complex environments.

[0026] During this process, the collected bandwidth signal can be used for testing in a laboratory environment, which reduces testing costs and improves testing efficiency.

[0027] In some embodiments, to achieve 360-degree signal acquisition of the test environment without blind spots, four signal acquisition branches 10 can be set up, each facing a different direction. Each signal acquisition branch 10 is used to independently acquire radio signals in one direction.

[0028] In some embodiments, the directional antenna 101 may be a horn antenna, a log-periodic antenna, or a microstrip array antenna, etc. By configuring directional antennas 101 facing different directions on different branches, the device can simultaneously acquire signals from four directions, such as east, south, west, and north, thereby obtaining the spatial distribution characteristics of signals in the environment.

[0029] In some embodiments, the first RF switch 1023 is a selector. One end of it is connected to the input of the gain adjustment module 1024, and the other two ends are connected to the outputs of the first bandpass filter 1021 and the second bandpass filter 1022, respectively. By controlling the state of the first RF switch 1023, the signal processed by the first bandpass filter 1021 or the signal processed by the second bandpass filter 1022 can be selected to be sent to the subsequent gain adjustment module 1024.

[0030] For example, when a tester needs to acquire signals in the 2.4 GHz band, the first RF switch 1023 can be controlled to switch to a state connected to the first bandpass filter 1021; when a signal in the 5 GHz band needs to be acquired, it can switch to a state connected to the second bandpass filter 1022. This design allows the same set of subsequent circuitry (gain adjustment module 1024 and baseband module 20) to be time-division multiplexed to process signals in different frequency bands, simplifying hardware design and reducing costs.

[0031] In the above embodiment, the gain adjustment module 1024 is used to adjust the power level of the selected and filtered bandwidth signal. In actual test environments, the received signal strength may vary drastically due to factors such as distance and obstruction, and may be very strong or very weak. If the signal is too strong, it may cause saturation distortion in the back-end circuitry; if the signal is too weak, it may be submerged in noise. The gain adjustment module 1024 amplifies or attenuates the signal to ensure that the signal power output to the baseband module 20 is always within an optimal, preset range. For example, this module can provide a gain (amplification capability) of up to 50dB and a dynamic adjustment range of 60dB to adapt to various complex signal environments and ensure signal quality.

[0032] In some embodiments, the channel bandwidth of the signal acquisition branch 10 is up to 160MHz, thereby covering the frequency bands of existing WIFI and Bluetooth, and thus covering existing application scenarios.

[0033] In some embodiments, such as Figure 2 As shown, each RF channel 102 also includes: The second radio frequency switch 1025 is connected in series between the directional antenna 101, the input terminal of the first bandpass filter 1021, and the input terminal of the second bandpass filter 1022; The input terminal of the second RF switch 1025 is connected to the directional antenna 101, the first output terminal of the second RF switch 1025 is connected to the input terminal of the first bandpass filter 1021, and the second output terminal of the second RF switch 1025 is connected to the input terminal of the second bandpass filter 1022. The second RF switch 1025 operates synchronously with the first RF switch 1023 to select the first bandpass filter 1021 or the second bandpass filter 1022 to connect to the directional antenna 101.

[0034] In this embodiment, the second RF switch 1025 is used in conjunction with the first RF switch 1023 to form a filtering channel between the first bandpass filter 1021 or the second bandpass filter 1022, thereby improving the isolation.

[0035] Specifically, if only the first RF switch 1023 is used, the bandwidth signal including Bluetooth will simultaneously enter the first bandpass filter 1021 and the second bandpass filter 1022. Although the first bandpass filter 1021 and the second bandpass filter 1022 will filter out the corresponding noise, they are not 100% effective and there will still be weak signal or noise leakage. When the second RF switch 1025 is used in conjunction with the first RF switch 1023, it can prevent noise from entering at the source of the first bandpass filter 1021 and the second bandpass filter 1022, thereby improving the isolation.

[0036] In addition, the first RF switch 1023 and the second RF switch 1025 used in conjunction can reduce signal crosstalk and improve the cleanliness of the bandwidth signal acquired by the multi-channel signal acquisition device.

[0037] In some embodiments, each radio frequency channel 102 further includes: The third RF switch 1026 has its input terminal connected to the output terminal of the gain adjustment module 1024; The third bandpass filter 1027 has its input terminal connected to the first output terminal of the third radio frequency switch 1026. The fourth bandpass filter 1028 has its input terminal connected to the second output terminal of the third RF switch 1026. The fourth RF switch 1029 has its first input terminal connected to the output terminal of the third bandpass filter 1027, its second input terminal connected to the output terminal of the fourth bandpass filter 1028, and its output terminal connected to the baseband module 20. Among them, the first bandpass filter 1021 and the third bandpass filter 1027 are bandpass filters of the same model, the second bandpass filter 1022 and the fourth bandpass filter 1028 are bandpass filters of the same model, and the third RF switch 1026 and the fourth RF switch 1029 operate synchronously with the first RF switch 1023 to select the same model of bandpass filter to work.

[0038] In this embodiment, the third bandpass filter 1027 and the fourth bandpass filter 1028 are used together to achieve secondary filtering of the signal.

[0039] Specifically, the first-stage filter is located before the gain adjustment module 1024. Its main purpose is to suppress strong out-of-band interference and prevent the gain adjustment module 1024 (usually an amplifier) ​​from entering the saturation or nonlinear operating region due to excessively strong out-of-band signals, thus ensuring the effectiveness of gain adjustment.

[0040] However, while amplifying the signal, the gain adjustment module 1024 may also introduce noise or generate out-of-band components such as harmonics and spurious signals. The second-stage filter in this embodiment is located after the gain adjustment module 1024, and its core function is to further purify the amplified signal, effectively filtering out the noise and spurious signals introduced by the gain adjustment module 1024, and further improving the purity of the signal.

[0041] In this embodiment, a selectable bandpass filter link is added after the gain adjustment module 1024 to perform secondary filtering on the signal. This design ensures that the bandwidth signal finally sent to the baseband module 20 for digital acquisition not only has an appropriate power level but also a higher signal-to-noise ratio and lower out-of-band spurious signals, greatly improving the quality and fidelity of signal acquisition. This is particularly important for applications requiring fine demodulation and interference analysis, thereby further enhancing the device's high-precision signal acquisition capability in complex electromagnetic environments while enabling flexible frequency band selection.

[0042] In the above embodiments, since the third RF switch 1026 and the fourth RF switch 1029 operate synchronously with the first RF switch 1023, only bandpass filters of the same type perform filtering operations at the same time, ensuring the accuracy of bandwidth signal acquisition.

[0043] In some embodiments, when the first RF switch 1023 selects the first bandpass filter 1021 to be connected to the gain adjustment module 1024, the third RF switch 1026 and the fourth RF switch 1029 select the third bandpass filter 1027 to operate, so as to select bandpass filters of the same type to work.

[0044] In some embodiments, when the first RF switch 1023 selects the second bandpass filter 1022 to be connected to the gain adjustment module 1024, the third RF switch 1026 and the fourth RF switch 1029 select the fourth bandpass filter 1028 to operate, so as to select bandpass filters of the same type to work.

[0045] In some embodiments, such as Figure 3 As shown, the baseband module 20 includes: The multi-channel analog-to-digital converter 201 has multiple input terminals connected one-to-one with the output terminals of multiple signal acquisition branches 10. It is used to sample the bandwidth signal output by the RF channel 102 based on the working clock signal to obtain the target bandwidth signal. The programmable logic chip 202 is connected to the output of the multiplexer analog-to-digital converter 201; The memory chip 203 is connected to the programmable logic chip 202; The programmable logic chip 202 is used to store the target bandwidth signal in the memory chip 203.

[0046] In some embodiments, the programmable logic chip 202 is a field programmable gate array (FPGA).

[0047] In some embodiments, the multiplexer 201 and the programmable logic chip 202 are integrated to form a radio frequency system-on-a-chip (RFSoC) chip.

[0048] In this embodiment, the programmable logic chip 202 and the multiplexer 201 are packaged inside a single chip, achieving high integration and greatly simplifying the design process and reducing time.

[0049] By encapsulating the programmable logic chip 202 and the multiplexer analog-to-digital converter 201 into a single chip, high-speed direct RF sampling and real-time buffering of multiple broadband signals are achieved. This architecture is not only highly integrated and simple in design, but also powerful in performance, capable of completely and losslessly recording transient and broadband signals under complex electromagnetic environments, providing valuable and authentic raw data for subsequent signal analysis and problem localization.

[0050] In this embodiment, by setting up the storage chip 203, ping-pong caching can be implemented, thereby meeting the storage needs of a large amount of data in a short period of time.

[0051] In some embodiments, the multi-channel signal acquisition device further includes: Storage array 30; Disk array card 40 is connected to storage array 30; The data processing platform 50 is connected to the programmable logic chip 202 and the disk array card 40 via a high-speed bus, and is used to read the target bandwidth signal cached on the storage chip 203 and store the read target bandwidth signal in the storage array 30.

[0052] In this embodiment, the storage array 30 and the disk array card 40 work together to achieve fast storage of the target bandwidth signal.

[0053] In some embodiments, the storage array 30 may support a storage capacity of 128TB.

[0054] In some embodiments, a central processing unit is deployed on the data processing platform 50, wherein the central processing unit stores the target bandwidth signal cached on the memory chip 203 in the memory array 30 when executing a pre-set program.

[0055] In some embodiments, the high-speed bus is a high-speed serial computer expansion bus standard (peripheral component interconnect express, PCI-Express) bus.

[0056] In some embodiments, such as Figure 3 As shown, SLOT1: PCIE3.0 16X and SLOT2: PCIE3.0 16X are deployed on the data processing platform 50, and are connected to the programmable logic chip 202 and the disk array card 40, respectively.

[0057] In some embodiments, such as Figure 3 As shown, there are 4 signal acquisition branches 10, and the radio frequency channels are radio frequency channel 1, radio frequency channel 2, radio frequency channel 3 and radio frequency channel 4. The downlink signal 1, downlink signal 2, downlink signal 3 and downlink signal 4 are acquired by using directional antennas 1, directional antenna 2, directional antenna 3 and directional antenna 4 set in the four directions of east, south, west and north.

[0058] In some embodiments, the multi-channel signal acquisition device further includes: Reference clock source 60 is used to generate a reference clock signal; The frequency synthesizer 70 is connected to the reference clock source 60 and is used to output a working clock signal based on the reference clock signal. Baseband module 20 also includes: The clock generation module 204 is connected to the programmable logic chip 202 and the multiplexer, respectively, and is used to receive the working clock signal and send the working clock signal to the programmable logic chip 202 and the multiplexer.

[0059] In this embodiment, the clock generation module 204 is connected to the frequency synthesizer 70 and synchronizes the working clock signal to the programmable logic chip 202 and the multiplexer 201, so that the programmable logic chip 202 and the multiplexer 201 adopt RF direct sampling technology, thereby meeting the verification requirements in actual scenarios.

[0060] In some embodiments, a highly stable 10MHz crystal oscillator built into the device can be used as an internal reference. In scenarios requiring system-level synchronization with other test equipment, the system can switch to receiving a higher-precision reference signal (e.g., an external 10MHz reference) from an external instrument, thereby ensuring time synchronization of the entire test system.

[0061] In some embodiments, the frequency of the reference clock signal is a first frequency, and the operating clock signal is a second frequency, wherein the second frequency is greater than the first frequency.

[0062] For example, the first frequency is 100MHz and the second frequency is 4.4GHz.

[0063] In some embodiments, the reference clock source 60 may also input a 10MHz reference clock signal as needed for actual use, and generate a working clock signal based on the 10MHz reference clock signal.

[0064] In some embodiments, the reference clock source 60 may also output a 100MHz clock signal to other modules of the multi-channel signal acquisition device as needed. The other modules may be deployed as needed, and the specific modules they contain will not be described in detail here.

[0065] In this embodiment, the coordinated operation of the reference clock source 60, the frequency synthesizer 70, and the clock generation module 204 within the baseband module 20 ensures that every step from front-end signal acquisition to back-end data processing operates under the same high-precision time reference. This is crucial for achieving strict synchronization of multi-channel signals and ensuring the accuracy of the timestamps of the acquired data.

[0066] In some embodiments, the passband frequency of the first bandpass filter 1021 is between 2400MHz and 2500MHz; The passband frequency of the second bandpass filter 1022 is between 5150MHz and 5895MHz.

[0067] In some embodiments, the multi-channel signal acquisition device further includes: The operating mode input module is connected to the first RF switch 1023 and is used to acquire the operating mode of the multi-channel signal acquisition device; and Based on the working mode input module, the first RF switch 1023 is controlled to select the first bandpass filter 1021 or the second bandpass filter 1022 to connect to the gain adjustment module 1024.

[0068] In this embodiment, a user interface or control interface is provided for acquiring or setting the desired operating mode of the current device, particularly the target frequency band to be acquired. This operating mode input module establishes a control connection with the first RF switch 1023 in each signal acquisition branch 10 to precisely control the selection of the signal path based on the acquired operating mode.

[0069] The operating mode input module can be specifically implemented as control software running on a host computer. Testers can use the graphical user interface of this software, for example, by clicking buttons or selecting from drop-down menus, to specify the frequency band of the signal to be acquired. For example, the user can select either a 2.4GHz band acquisition mode or a 5GHz band acquisition mode. This user selection constitutes the operating mode.

[0070] Once the operating mode is set, the operating mode input module converts the mode information into a specific control command and sends it to the device's control core via the communication interface, which in turn edits the logic chip 202. Upon receiving the command, the control core generates a corresponding level signal to drive the first RF switch 1023.

[0071] For example, when the operating mode input module acquires the operating mode as 2.4GHz band acquisition, it outputs a first control signal (e.g., high level) to the control pin of the first RF switch 1023. This control signal causes the first RF switch 1023 to switch to a first state, in which the switch connects the output of the first bandpass filter 1021 (2.4GHz filter) to the input of the gain adjustment module 1024, while disconnecting the second bandpass filter 1022 from the gain adjustment module 1024. In this way, only signals in the 2.4GHz band can be sent to subsequent circuits for processing.

[0072] Accordingly, when the operating mode input module acquires the operating mode as 5GHz band acquisition, it outputs a second control signal (e.g., low level) to the first RF switch 1023. This signal causes the switch to switch to the second state, connecting the output of the second bandpass filter 1022 (5GHz filter) to the input of the gain adjustment module 1024.

[0073] In this embodiment, the first RF switch 1023 is automatically controlled by introducing a working mode input module, thus realizing the software-based and programmable configuration of the device's operating frequency band. Test personnel do not need to make any physical adjustments to the hardware; they can quickly and conveniently switch the acquisition target simply by operating the host computer software. This greatly improves the operational convenience and testing efficiency of the device in actual field testing, enabling the device to flexibly switch between the WIFI 2.4G / Bluetooth band and the WIFI 5G band according to the needs of the testing task.

[0074] In some embodiments, the operating mode further includes a hybrid acquisition mode. Specifically, when the operating mode input module obtains the operating mode as hybrid acquisition mode, it outputs a first control signal (e.g., a high level) to the control pin of the first RF switch 1023 in the first part of the signal acquisition branch. This control signal causes the first RF switch 1023 to switch to a first state, in which the switch connects the output of the first bandpass filter 1021 (2.4GHz filter) to the input of the gain adjustment module 1024, while disconnecting the second bandpass filter 1022 from the gain adjustment module 1024. Thus, only signals in the 2.4GHz band can be sent to subsequent circuits for processing.

[0075] Simultaneously, a second control signal (e.g., low level) is output to the first RF switch 1023 in the signal acquisition branch of the second part. This signal causes the switch to switch to the second state, connecting the output of the second bandpass filter 1022 (5GHz filter) to the input of the gain adjustment module 1024.

[0076] The number and location of the signal acquisition branches in the first part and the second part can be selected according to actual needs, and will not be elaborated here.

[0077] In this embodiment, a multi-channel signal acquisition device can be used to simultaneously acquire signals of different bandwidths according to actual usage needs, so as to meet the testing needs in different scenarios.

[0078] In some embodiments, the bandwidth signals acquired by different signal acquisition branches are ping-pong stored in a memory chip.

[0079] For example, if there are 4 signal acquisition branches 10, the bandwidth signal corresponding to signal acquisition branch 1 is CH1, the bandwidth signal corresponding to signal acquisition branch 2 is CH2, the bandwidth signal corresponding to signal acquisition branch 3 is CH3, and the bandwidth signal corresponding to signal acquisition branch 4 is CH4. The bandwidth signals corresponding to the 4 signal acquisition branches 10 are stored in the memory chip 203 in the following order: CH1-CH2-CH3-CH4-CH1-CH2-CH3-CH4.

[0080] In this embodiment, by using the ping-pong storage method described above, the storage chip can meet the storage requirements of a large amount of data in a short period of time, thus ensuring effective data storage.

[0081] In some embodiments, the multiplexer and programmable logic chip are integrated.

[0082] Specifically, the multi-channel analog-to-digital converter and the programmable logic chip are integrated into the same chip.

[0083] In this embodiment, the high integration of the chip greatly simplifies the design process and reduces time.

[0084] In some embodiments, the first RF switch 1023 switches the conduction state according to a preset cycle to switch the connection between the first bandpass filter 1021 or the second bandpass filter 1022 and the gain adjustment module 1024.

[0085] In this embodiment, instead of relying on the tester to manually select and fix a frequency band throughout the test, the device's internal controller automatically and periodically switches between two frequency bands.

[0086] Specifically, during the first half of the cycle (e.g., from 0ms to 100ms), the control core outputs a control signal, causing the first RF switch 1023 to connect the output of the first bandpass filter 1021 (2.4GHz) to the gain adjustment module 1024. During this period, the device acquires, processes, and stores signals in the 2.4GHz frequency band.

[0087] During the second half of the cycle (e.g., from 100ms to 200ms), the control core changes the control signal, causing the first RF switch 1023 to switch states and connect the output of the second bandpass filter 1022 (5GHz) to the gain adjustment module 1024. During this period, the device acquires, processes, and stores signals in the 5GHz band.

[0088] At 200ms, the cycle ends and a new cycle begins. The first RF switch 1023 switches back to the state of being connected to the first bandpass filter 1021, and this cycle repeats.

[0089] In this embodiment, it is ensured that the bandwidth signals acquired by multiple signal acquisition branches at the same time are from the same frequency band, avoiding signal interference between different frequency bands. Although only one frequency band signal is acquired at any extremely short point in time, the switching period can be set to be very short (e.g., on the millisecond level), thus enabling the approximate simultaneous capture of the dynamic changes of two frequency bands on a macroscopic time scale. This mode can obtain the bandwidth signals of two key frequency bands, 2.4GHz and 5GHz, in a single acquisition without deploying two sets of parallel hardware links, thereby effectively controlling hardware cost and complexity while ensuring functional diversity.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-channel signal acquisition device, characterized in that, include: Multiple signal acquisition branches, each of which includes a directional antenna and a radio frequency channel connected to the directional antenna. The directional antennas on different multiple signal acquisition branches have different orientations to synchronously acquire bandwidth signals in different directions. The baseband module is connected to multiple signal acquisition branches and is used to receive the bandwidth signal acquired by the directional antenna through the radio frequency channel in each of the signal acquisition branches. The baseband module includes a programmable logic chip and a storage chip. The baseband module synchronously samples the bandwidth signals output from multiple signal acquisition branches based on a unified working clock signal to obtain a target bandwidth signal, and stores the target bandwidth signal in the storage chip. Storage array; A disk array card, connected to the storage array; The data processing platform is connected to the programmable logic chip and the disk array card via a high-speed bus, and is used to read the target bandwidth signal cached on the storage chip and store the read target bandwidth signal in the storage array. The radio frequency channel includes a first bandpass filter, a second bandpass filter, a first radio frequency switch, and a gain adjustment module. The first radio frequency switch is used to select the first bandpass filter or the second bandpass filter to be connected to the gain adjustment module, so as to perform filtering and gain adjustment processing on the bandwidth signal. The radio frequency channel also includes: The third radio frequency switch, the input terminal of which is connected to the output terminal of the gain adjustment module; A third bandpass filter, wherein the input terminal of the third bandpass filter is connected to the first output terminal of the third radio frequency switch; A fourth bandpass filter, the input of which is connected to the second output of the third radio frequency switch; A fourth radio frequency switch, wherein the first input terminal of the fourth radio frequency switch is connected to the output terminal of the third bandpass filter, the second input terminal of the fourth radio frequency switch is connected to the output terminal of the fourth bandpass filter, and the output terminal of the fourth radio frequency switch is connected to the baseband module; The first bandpass filter and the third bandpass filter are of the same type, as are the second bandpass filter and the fourth bandpass filter. The third RF switch and the fourth RF switch operate synchronously with the first RF switch to select the same type of bandpass filter to operate, so that the baseband module can store the bandwidth signal after secondary filtering by the third or fourth bandpass filter.

2. The multi-channel signal acquisition device according to claim 1, characterized in that, Each of the aforementioned radio frequency channels further includes: The second radio frequency switch is connected in series between the directional antenna, the input terminal of the first bandpass filter, and the input terminal of the second bandpass filter; The input terminal of the second RF switch is connected to the directional antenna, the first output terminal of the second RF switch is connected to the input terminal of the first bandpass filter, and the second output terminal of the second RF switch is connected to the input terminal of the second bandpass filter. The second radio frequency switch operates synchronously with the first radio frequency switch to select whether the first bandpass filter or the second bandpass filter is connected to the directional antenna.

3. The multi-channel signal acquisition device according to claim 1 or 2, characterized in that, The baseband module also includes: A multi-channel analog-to-digital converter, wherein the multiple input terminals of the multi-channel analog-to-digital converter are connected one-to-one with the output terminals of the multiple signal acquisition branches, and is used to sample the bandwidth signal output by the radio frequency channel based on the working clock signal to obtain the target bandwidth signal; The programmable logic chip is connected to the output of the multi-channel analog-to-digital converter; The storage chip is connected to the programmable logic chip.

4. The multi-channel signal acquisition device according to claim 3, characterized in that, The multi-channel signal acquisition device also includes: Reference clock source, used to generate a reference clock signal; A frequency synthesizer, connected to the reference clock source, is used to output a working clock signal based on the reference clock signal; The baseband module also includes: A clock generation module is connected to the programmable logic chip and the multiplexer, respectively, for receiving the working clock signal and sending the working clock signal to the programmable logic chip and the multiplexer.

5. The multi-channel signal acquisition device according to claim 3, characterized in that, The passband frequency of the first bandpass filter is between 2400MHz and 2500MHz; The passband frequency of the second bandpass filter is between 5150MHz and 5895MHz.

6. The multi-channel signal acquisition device according to claim 1 or 2, characterized in that, The multi-channel signal acquisition device also includes: Operating mode input module, the operating mode input module being connected to the first radio frequency switch, is used to acquire the operating mode of the multi-channel signal acquisition device; and Based on the operating mode input module, the first RF switch is controlled to select either the first bandpass filter or the second bandpass filter to connect to the gain adjustment module.

7. The multi-channel signal acquisition device according to claim 3, characterized in that, The bandwidth signals acquired by the different signal acquisition branches are stored in the memory chip.

8. The multi-channel signal acquisition device according to claim 3, characterized in that, The multi-channel analog-to-digital converter and the programmable logic chip are integrated.

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