Dynamic reconfigurable multichannel high-speed digital signal acquisition, recording and playback device and method

Abstract

The invention belongs to the technical field of radio, and relates to a dynamic reconfigurable multichannel high-speed digital signal acquisition, recording and playback device and method. The device is composed of a signal collecting and processing module, a data storage module, a synchronous clock module, a data interaction module and a main control module. The data storage module is connected through the data interaction module; the plurality of signal acquisition and processing modules are used for acquiring and processing signals of different channels and storing processed data in the data storage module through the data interaction module; the data interaction module realizes high-speed digital signal interaction control of the signal acquisition and processing module and the data storage module; the synchronous clock module provides a synchronous sampling clock to realize synchronous acquisition of each signal channel in the device; and the master control module realizes comprehensive control and management of each module in the device. According to the invention, the number of intermediate frequency acquisition channels is increased; a reconfigurable design concept is adopted to realize different configurations of the number of acquisition channels so as to meet different application scenes.

Description

Technical Field

[0001] This invention belongs to the field of radio technology and relates to a dynamically reconfigurable multi-channel high-speed digital signal acquisition, recording, and playback device and method. Background Technology

[0002] With the development of radio technology, wireless equipment is flourishing in fields such as radar, 5G / 6G communication, and autonomous driving. The electromagnetic environment in space is also becoming increasingly complex. The acquisition and recording of on-site signals is crucial for electromagnetic environment signal analysis and accelerating equipment development. In electromagnetic spectrum monitoring applications, regional electromagnetic spectrum monitoring systems are mostly distributed monitoring nodes. The recording of raw electromagnetic environment data provides important data support for electromagnetic environment analysis and interference troubleshooting. In MIMO communication systems, the acquisition and recording of multi-channel on-site data provides data support for the rapid development of communication equipment. In the field of autonomous driving, millimeter-wave radar is increasingly used. In practical applications, multiple radars are deployed simultaneously at different locations on the vehicle. Collecting and recording radar data from different locations is of great significance for autonomous driving algorithm design and millimeter-wave radar.

[0003] Current signal acquisition and recording systems are mostly dedicated signal acquisition and recording systems, typically composed of a radio frequency (RF) front-end, an intermediate frequency (IF) acquisition unit, and a storage unit. For example, patent CN102590827, "GNSS Receiver System with Built-in IF Recording and Playback Function," discloses a GNSS receiver system with built-in IF recording functionality. This device consists of a GNSS receiver subsystem, an IF data recording subsystem, an IF data real-time playback subsystem, and an isolated compatibility interface module, realizing the recording and playback of GNSS signals and providing convenience for dynamic field testing of GNSS receivers in complex environments. However, this solution is only suitable for GNSS signal reception and cannot achieve the acquisition, recording, and playback of broader bandwidth, higher-level multi-channel general-purpose signals.

[0004] Current stand-alone products cannot meet the usage requirements in terms of the number of channels, recording bandwidth, and storage capacity. Summary of the Invention

[0005] To address the shortcomings of existing signal acquisition and recording equipment, this invention proposes a dynamically reconfigurable multi-channel broadband high-speed digital signal acquisition and recording device. This device adopts a hardware reconfigurable design concept to realize signal acquisition, recording, and playback of different sampling channels. The device employs digital down-conversion and digital up-conversion designs to meet the acquisition requirements of any intermediate frequency signal.

[0006] The technical solution provided by this invention is: a dynamically reconfigurable multi-channel high-speed digital signal acquisition, recording, and playback device. It consists of a signal acquisition and processing module, a data storage module, a synchronization clock module, a data interaction module, and a main control module. The data storage module is connected through the data interaction module. Several signal acquisition and processing modules acquire and process signals from different channels, and store the processed data in the data storage module through the data interaction module. The data interaction module enables high-speed digital signal interaction control between the signal acquisition and processing module and the data storage module. The synchronization clock module provides a synchronous sampling clock to achieve synchronous acquisition of each signal channel within the device. The main control module enables comprehensive control and management of all modules within the device.

[0007] Preferably, the signal acquisition and processing module comprises an intermediate frequency (IF) conditioning unit, a data acquisition unit, a digital down-conversion unit, a digital up-conversion unit, a digital-to-analog converter (DAC), and a baseband conditioning unit. The IF conditioning unit, data acquisition unit, and digital down-conversion unit are connected in sequence. The digital down-conversion unit is connected to the data interaction module to perform AC / DC switching of the IF signal coupling mode, gain adjustment, low-pass filtering and impedance transformation, analog-to-digital conversion and acquisition, and digital down-conversion, generating the raw IQ data of the IF signal and storing the data. The digital up-conversion unit, DAC, and baseband conditioning unit are connected in sequence. The digital up-conversion unit is connected to the data interaction module to perform IQ data interpolation and up-conversion, digital-to-analog conversion, and generate the required baseband signal. The baseband signal is output after impedance transformation, filtering, and amplification.

[0008] Preferably, the digital downconversion unit consists of a digital local oscillator and a multi-stage decimation filter; the digital downconversion unit generates the raw IQ data of the set intermediate frequency by setting the frequency of the digital local oscillator and the number of decimation filters according to the instructions of the main control module, including the center frequency and bandwidth of the intermediate frequency.

[0009] Preferably, the signal acquisition and processing module is suitable for acquiring 4 / 8 / 12 / 16 channel signals.

[0010] Preferably, the ADC sampling rate of the signal acquisition and processing module is 1GSPS~5GSPS.

[0011] Preferably, the data acquisition unit has a maximum sampling rate of 5GSPS, enabling the acquisition of DC to 2.4GHz intermediate frequency signals.

[0012] Preferably, the signal bandwidth ranges from 5MHz to 2GHz.

[0013] Furthermore, the present invention also provides a dynamically reconfigurable multi-channel high-speed digital signal acquisition, recording, and playback method, which includes an acquisition and recording process and a playback process. The acquisition and recording process includes: after the intermediate frequency signal enters the signal acquisition and processing module, it first enters the intermediate frequency conditioning unit for AC / DC signal coupling mode switching, gain adjustment, low-pass filtering, and impedance transformation before being output to the data acquisition unit; the data acquisition unit performs analog-to-digital conversion to complete the acquisition of the high-speed signal and sends the acquired data to the digital down-conversion unit; the digital down-conversion unit performs digital down-conversion of the intermediate frequency signal to generate raw IQ data and sends the raw IQ data to the data interaction module; the data storage module records the raw IQ data sent by the data interaction module. The playback process includes: the data storage module sending the original IQ data to be played back to the data interaction module; the data interaction module sending the original IQ data to the designated signal acquisition and processing module according to the instruction; after the original IQ data enters the signal acquisition and processing module, it first enters the digital up-conversion unit, and after interpolation filtering, the original IQ data is orthogonally mixed with the digital local oscillator to generate baseband data, and the baseband data is sent to the digital-to-analog conversion unit for digital-to-analog conversion to generate the required baseband signal; the baseband signal is output after impedance change, filtering and amplification by the baseband conditioning unit.

[0014] This invention addresses the need for acquisition, recording, playback, and analysis of arbitrary intermediate frequency (IF) signals across multiple channels by proposing a multi-channel high-speed digital signal acquisition, recording, and playback device. This device expands the number of IF acquisition channels to meet the needs of multi-channel acquisition, recording, and playback scenarios. It employs a reconfigurable design concept to allow for different configurations of the number of acquisition channels to satisfy various application scenarios. Utilizing digital down-conversion and digital up-conversion, the device covers a frequency range of DC to 2.4 GHz and a bandwidth range of 5 MHz to 2 GHz, satisfying the application requirements of different devices. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the dynamically reconfigurable multi-channel broadband high-speed digital signal acquisition, recording, and playback device provided in this embodiment of the invention. Figure 2 This is a schematic diagram of the signal acquisition and processing module and a schematic diagram of the data acquisition, recording, and playback principle. Figure 3 This is a schematic diagram of the structure of a digital down-converter unit; Figure 4 This is a schematic diagram of the structure of a digital up-conversion unit. Detailed Implementation

[0016] To more clearly understand the technical content of this invention, its solution will now be described in detail with reference to the accompanying drawings and specific embodiments. The accompanying drawings show a preferred embodiment of this invention, but its scope of protection is not limited thereto, and can be flexibly adjusted according to specific usage requirements in practical applications. This embodiment aims to help those skilled in the art to fully and deeply understand the inventive concept of this solution.

[0017] This invention proposes a dynamically reconfigurable multi-channel broadband high-speed digital signal acquisition and recording device, the structure of which and its components are as follows: Figure 1 As shown, the device mainly consists of four signal acquisition and processing modules 1, a synchronization clock module 2, a data interaction module 3, four data storage modules 4, and a main control module 5. The number of signal acquisition and processing modules can be selected from 1 to 4 as needed to achieve different requirements for acquiring and playing back signals such as 4 / 8 / 12 / 16 channels. The synchronization clock module 2 provides a synchronous sampling clock for the device, enabling synchronous acquisition of each signal channel. The data interaction module 3 enables high-speed digital signal interaction control between the signal acquisition and processing modules and the data storage modules. The number of data storage modules 4 can be selected according to the storage capacity to achieve high-speed data recording of the system. The main control module 5 enables comprehensive control and management of all modules within the device.

[0018] like Figure 2 As shown, the signal acquisition and processing module consists of an intermediate frequency (IF) conditioning unit 1-1, a data acquisition unit 1-2, a digital down-conversion unit 1-3, a digital up-conversion unit 1-4, a digital-to-analog converter (DAC) unit 1-5, and a baseband conditioning unit 1-6. The IF conditioning unit 1-1, data acquisition unit 1-2, and digital down-conversion unit 1-3 are connected sequentially. The digital down-conversion unit 1-3 is connected to the data interaction module 3, enabling AC / DC switching of the IF signal coupling mode, gain adjustment, low-pass filtering and impedance transformation, analog-to-digital conversion and acquisition, and digital down-conversion to generate the raw IQ data and store it. The digital up-conversion unit 1-4, DAC unit 1-5, and baseband conditioning unit 1-6 are connected sequentially. The digital up-conversion unit 1-6 is connected to the data interaction module 3, enabling IQ data interpolation and up-conversion, digital-to-analog conversion, and generating the required baseband signal. The baseband signal is then output after impedance transformation, filtering, and amplification.

[0019] like Figure 3 As shown, the digital downconversion unit 1-3 consists of a digital local oscillator and a multi-stage decimation filter. The digital downconversion unit sets the frequency of the digital local oscillator and the number of decimation filters according to the instructions of the main control module 5 (including the center frequency and bandwidth of the intermediate frequency), generates the raw IQ data of the set intermediate frequency, and sends the IQ data to the data interaction module 3.

[0020] The composition of digital upconverter units 1-6 is as follows: Figure 4 As shown.

[0021] Based on the above-mentioned dynamically reconfigurable multi-channel broadband high-speed digital signal acquisition and recording device, the present invention also provides a dynamically reconfigurable multi-channel high-speed digital signal acquisition, recording and playback method, which includes an acquisition and recording process and a playback process.

[0022] Acquisition and Recording Process: After the intermediate frequency (IF) signal enters the signal acquisition and processing module, it first enters the IF conditioning unit for AC / DC signal coupling switching, gain adjustment, low-pass filtering, and impedance transformation before being output to the data acquisition unit. The data acquisition unit performs analog-to-digital conversion to acquire the high-speed signal. The maximum sampling rate of the data acquisition unit's ADC is 5 GSPS, enabling the acquisition of IF signals from DC to 2.4 GHz, and sends the acquired data to the digital down-conversion unit. The digital down-conversion unit performs digital down-conversion of the IF signal. According to the instructions of the main control module, the digital down-conversion unit sets the frequency of the digital local oscillator and the number of decimation filters, generates the raw IQ data of the set IF, and sends the IQ data to the data interaction module. The data interaction module enables data interaction between multiple signal acquisition and processing modules and multiple data storage modules. The data storage module records the raw IQ data sent by the data interaction module. The sampling rate of the signal acquisition and processing module is also controlled by the main control module, and the ADC sampling rate can be configured from 1 GSPS to 5 GSPS.

[0023] Playback Process: When the main control module initiates the data playback task, the data storage module sends the IQ data to be played back to the data interaction module; the data interaction module sends the IQ data to the designated signal acquisition and processing module according to the instructions; after the IQ data enters the signal acquisition and processing module, it first enters the digital up-conversion unit, and after interpolation filtering, the IQ data is orthogonally mixed with the digital local oscillator to generate baseband data. The baseband data is sent to the digital-to-analog conversion unit for digital-to-analog conversion to generate the required baseband signal; the baseband signal is output after impedance change, filtering and amplification by the baseband conditioning unit.

Claims

1. A dynamically reconfigurable multi-channel high-speed digital signal acquisition, recording, and playback device, characterized in that: The signal acquisition processing module, the data storage module, the synchronous clock module, the data interaction module and the main control module are connected; the data storage module is connected through the data interaction module; the signal acquisition processing module realizes the acquisition and processing of different channel signals, and stores the processed data in the data storage module through the data interaction module; the data interaction module realizes the high-speed digital signal interaction control of the signal acquisition processing module and the data storage module; the synchronous clock module provides a synchronous sampling clock to realize the synchronous acquisition of each signal channel in the device; and the main control module realizes the comprehensive control and management of each module in the device.

2. The dynamic reconfigurable multi-channel high-speed digital signal acquisition, recording and playback device according to claim 1, characterized in that: The signal acquisition processing module is composed of an intermediate frequency conditioning unit, a data acquisition unit, a digital down conversion unit, a digital up conversion unit, a digital-to-analog conversion unit and a baseband conditioning unit; the intermediate frequency conditioning unit, the data acquisition unit and the digital down conversion unit are connected in sequence, the digital down conversion unit is connected with the data interaction module, the AC / DC switching of the intermediate frequency signal coupling mode, the gain adjustment, the low-pass filtering and impedance transformation, the analog-to-digital conversion and acquisition, the digital down conversion are realized, the original IQ data of the intermediate frequency are generated, and the data storage is completed; the digital up conversion unit, the digital-to-analog conversion unit and the baseband conditioning unit are connected in sequence, the digital up conversion unit is connected with the data interaction module, the interpolation and up conversion of the IQ data, the digital-to-analog conversion are realized, the required baseband signal is generated, and the baseband signal is output after impedance change, filtering and amplification.

3. The dynamic reconfigurable multi-channel high-speed digital signal acquisition, recording and playback device according to claim 2, characterized in that: The digital down conversion unit is composed of a digital local oscillator and a multi-stage decimation filter; the digital down conversion unit sets the frequency of the digital local oscillator and the number of decimation filters according to the instructions of the main control module, including the center frequency of the intermediate frequency and the intermediate frequency bandwidth, to generate the original IQ data of the set intermediate frequency.

4. The dynamically reconfigurable multi-channel high-speed digital signal acquisition, recording and playback device according to any one of claims 1-3, characterized in that: The signal acquisition processing module is suitable for the acquisition of 4 / 8 / 12 / 16 channel signals.

5. The dynamically reconfigurable multi-channel high-speed digital signal acquisition, recording and playback device according to any one of claims 1-3, characterized in that: The ADC sampling rate of the signal acquisition processing module is 1GSPS~5GSPS.

6. The dynamically reconfigurable multi-channel high-speed digital signal acquisition, recording and playback device of any one of claims 2-3, wherein: The highest sampling rate of the data acquisition unit is 5GSPS, realizing the acquisition of DC~2.4GHz intermediate frequency signals.

7. The dynamically reconfigurable multi-channel high-speed digital signal acquisition, recording and playback device according to any one of claims 1-3, characterized in that: The bandwidth range of the signal is 5MHz~2GHz.

8. A dynamic reconfigurable multi-channel high-speed digital signal acquisition recording playback method, characterized in that: The method comprises a collection recording process and a playback process; The collection recording process comprises the following steps: after the intermediate frequency signal enters the signal acquisition processing module, the signal is first input into the intermediate frequency conditioning unit to realize the AC / DC switching of the signal coupling mode, the gain adjustment, the low-pass filtering and the impedance transformation, and then output to the data acquisition unit; the data acquisition unit realizes the analog-to-digital conversion to complete the acquisition of high-speed signals, and sends the collected data to the digital down conversion unit; the digital down conversion unit realizes the digital down conversion of the intermediate frequency signal, generates the original IQ data, and sends the original IQ data to the data interaction module; and the data storage module records the original IQ data sent by the data interaction module. The playback process comprises: a data storage module sends original IQ data needing to be played back to a data interaction module; the data interaction module sends the original IQ data to a designated signal acquisition and processing module according to an instruction; after the original IQ data enters the signal acquisition and processing module, the original IQ data first enters a digital up-conversion unit, the original IQ data is subjected to interpolation filtering and then subjected to digital local oscillator quadrature mixing to generate baseband data, the baseband data is sent to a digital-to-analog conversion unit to generate a required baseband signal through digital-to-analog conversion; and the baseband signal is output after impedance change, filtering and amplification of the baseband signal through a baseband conditioning unit.

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