CN115085842A - Radio frequency signal acquisition, recording and playback system - Google Patents
Radio frequency signal acquisition, recording and playback system Download PDFInfo
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Abstract
The invention relates to the technical field of signal processing, and provides a radio frequency signal acquisition, recording and playback system, which comprises a down converter, an intermediate frequency signal recording unit and an up converter, wherein the down converter is used for receiving radio frequency signals and converting the radio frequency signals into intermediate frequency signals; the intermediate frequency signal recording unit is used for receiving the intermediate frequency signal, converting the intermediate frequency signal into a digital intermediate frequency signal and storing the digital intermediate frequency signal in the solid-state disk array; and the up-converter is used for receiving the intermediate frequency signals played back from the solid-state disk array by the intermediate frequency signal recording unit and converting the intermediate frequency signals into radio frequency signals. According to the radio frequency signal acquisition, recording and playback system, information interaction among the down converter, the intermediate frequency signal recording unit and the up converter is constructed, so that an internal field test task of communication countermeasure can be guaranteed, and the simulation test capability is improved; the system can collect signal samples in real time, can return communication signals to the air to be used as real-time test signals, and has the capability of viewing, monitoring and displaying frequency spectrums.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to a radio frequency signal acquisition, recording and playback system.
Background
The field signal plays an important role in the fields of radar, aerospace, communication, electronic warfare and the like. The signals have the characteristics of strong real-time performance, high data rate, large data volume, complex processing and the like. Therefore, the acquisition of the signals plays a role in lifting the weight, and various semi-physical simulation and physical systems can be constructed. Once the information can be collected, stored and played back, original real data are provided for various experiments, the development period is greatly shortened, and the research cost is reduced.
In the fields, radio frequency signals in the air are often required to be acquired, analyzed and played back, long-time recording is sometimes required to be carried out on the signals according to different applications, and the acquisition time of the signals is required from microseconds to milliseconds to seconds or even to hours, so that a high-speed signal real-time monitoring, acquisition and storage system in a complex electromagnetic environment has very important practical significance, and no good equipment is available for acquiring, recording and playing back the signals.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a radio frequency signal acquisition, recording and playback system.
The invention provides a radio frequency signal acquisition, recording and playback system, which comprises a down converter, an intermediate frequency signal recording unit and an up converter, wherein:
the down converter is used for receiving radio frequency signals and converting the radio frequency signals into intermediate frequency signals;
the intermediate frequency signal recording unit is used for receiving the intermediate frequency signal, converting the intermediate frequency signal into a digital intermediate frequency signal and storing the digital intermediate frequency signal in a solid-state disk array;
and the up-converter is used for receiving the intermediate frequency signal played back by the intermediate frequency signal recording unit from the solid-state disk array and converting the intermediate frequency signal into a radio frequency signal.
In one embodiment, the intermediate frequency signal recording unit includes a data acquisition unit, an intermediate frequency processing unit, a main control unit, a data storage unit, and a data playback unit, wherein:
the data acquisition unit is used for carrying out A/D conversion on the intermediate frequency signal to obtain a digital intermediate frequency signal;
the intermediate frequency processing unit is used for carrying out signal spectrum analysis on the digital intermediate frequency signal to obtain monitoring spectrum data and reporting the monitoring spectrum data to the main control unit; determining and collecting digital intermediate frequency signals corresponding to the target frequency points according to the monitoring frequency spectrum data;
the main control unit is used for displaying the monitoring frequency spectrum data, converting the digital intermediate frequency signals corresponding to the target frequency points into data files, and storing the data files in the solid-state disk array through the data storage unit;
and the data playback unit is used for performing D/A conversion on the digital intermediate frequency signals corresponding to the target frequency points to obtain intermediate frequency signals, and the intermediate frequency signals are converted into radio frequency signals by the up-converter.
In an embodiment, the if processing unit is specifically configured to: and performing signal spectrum analysis on the digital intermediate-frequency signal according to preset monitoring parameters, and selecting a baseband digital signal with a preset sampling rate according to the requirements of spectrum bandwidth and resolution ratio to perform FFT (fast Fourier transform) and power spectrum calculation to obtain monitoring spectrum data.
In one embodiment, the down converter comprises a first amplifier, a pre-filter, a first mixer, a first filter, a second amplifier, a second mixer, a second filter, a third amplifier, a booster, and a fourth amplifier, wherein:
the input end of the first amplifier is connected with a radio frequency signal, the output end of the first amplifier is connected with the input end of the pre-filter, the output end of the pre-filter is connected with the first input end of the first mixer, the second input end of the first mixer is connected with a first local oscillator signal, the output end of the first mixer is connected with the input end of the first filter, the output end of the first filter is connected with the input end of the second amplifier, the output end of the second amplifier is connected with the first input end of the second mixer, the second input end of the second mixer is connected with a second local oscillator signal, the output end of the second mixer is connected with the input end of the second filter, the output end of the second filter is connected with the input end of the third amplifier, the output end of the third amplifier is connected with the input end of the gain device, the output end of the gain device is connected with the input end of the fourth amplifier, and the output end of the fourth amplifier is connected with the data acquisition unit.
In one embodiment, the intermediate frequency processing unit comprises an N-th order anti-aliasing filtering device, wherein:
and the N-order anti-aliasing filtering device is used for determining the order according to the preset effective signal bandwidth and the sampling rate, then determining the digital intermediate frequency signal corresponding to the target frequency point according to the monitoring frequency spectrum data, performing anti-aliasing filtering processing on the digital intermediate frequency signal corresponding to the target frequency point, and outputting the IQ digital signal to be sampled.
In one embodiment, the anti-aliasing filtering device of each order comprises a forward filtering unit and a backward filtering unit, wherein the forward filtering unit comprises a forward mixer and a third filter, and the backward filtering unit comprises a backward mixer and a fourth filter.
In one embodiment, the main control unit is further configured to: and determining whether the digital intermediate frequency signals corresponding to the target frequency points meet signal storage warning conditions, and if so, sending warning information.
In one embodiment, the main control unit is specifically configured to: and generating a graphical file based on the monitoring spectrum data, and displaying the graphical file.
In an embodiment, the up-converter is specifically configured to: and adjusting the center frequency to play back the intermediate frequency signal to obtain a radio frequency signal, and outputting the radio frequency signal.
In one embodiment, the data acquisition unit and the data playback unit respectively adopt an FPGA mezzanine card high-speed ADC module and an FPGA mezzanine card high-speed DAC module.
According to the radio frequency signal acquisition, recording and playback system, information interaction among the down converter, the intermediate frequency signal recording unit and the up converter is established, so that an internal field test task of communication countermeasure can be guaranteed, and the simulation test capability is improved; the system can collect signal samples in real time, can return communication signals to the air to be used as real-time test signals, and has the capability of viewing, monitoring and displaying frequency spectrums.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a radio frequency signal acquisition, recording and playback system provided by the present invention;
FIG. 2 is a schematic diagram of a frame of a radio frequency signal acquisition, recording and playback system provided by the present invention;
FIG. 3 is a schematic diagram of a down converter provided by the present invention;
FIG. 4 is a schematic structural diagram of an analog-to-digital converter and a first-order anti-aliasing filter apparatus provided by the present invention;
FIG. 5 is a schematic flow chart of data of the multi-order anti-aliasing filtering apparatus provided by the present invention during the filtering process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The following describes the radio frequency signal acquisition, recording and playback system of the present invention with reference to fig. 1 to 5, which includes a down converter 11, an intermediate frequency signal recording unit 12 and an up converter 13, wherein:
the down converter 11 is used for receiving radio frequency signals and converting the radio frequency signals into intermediate frequency signals;
the intermediate frequency signal recording unit 12 is configured to receive the intermediate frequency signal, convert the intermediate frequency signal into a digital intermediate frequency signal, and store the digital intermediate frequency signal in the solid-state disk array;
and the up converter 13 is used for receiving the intermediate frequency signal played back by the intermediate frequency signal recording unit from the solid-state disk array and converting the intermediate frequency signal into a radio frequency signal.
In contrast, in the present invention, the radio frequency signal acquisition, recording and playback system is mainly used to guarantee the communication countermeasure infield test task and improve the simulation test capability; the system can collect signal samples in real time, can return communication signals to the air to be used as real-time test signals, and has the capability of viewing, monitoring and displaying frequency spectrums.
The radio frequency signal acquisition, recording and playback system integrally comprises a down converter, an intermediate frequency signal recording unit and an up converter. The down converter converts radio frequency signals (1 MHz-6.6 GHz) into intermediate frequency signals and can adjust power. The intermediate frequency signal recording unit is used for carrying out digital processing on the intermediate frequency signal to convert the intermediate frequency signal into a digital intermediate frequency signal, and storing the digital intermediate frequency signal into a local solid-state disk array in a data file mode. The up-converter converts the intermediate frequency signal returned from the intermediate frequency signal recording unit into a radio frequency signal (1 MHz-6.6 GHz) and outputs the radio frequency signal.
In the invention, the up-converter adjusts the center frequency to play back the intermediate frequency signal, so as to obtain a radio frequency signal and output the radio frequency signal. In addition, the signals are subjected to preliminary analysis based on playback display, the position, pause and other operations of the analysis file can be selected at will in the analysis process, and data segmentation and data format conversion can be carried out.
In the invention, the radio frequency signal acquisition, recording and playback system adopts the design concept of a software radio architecture, and is designed into a communication signal receiving and storing platform with wide frequency band, strong signal processing capability, and good universality and expansibility. The device consists of a high-performance hardware platform, a standardized software platform and a high-speed acquisition, storage and playback software application platform. Referring to fig. 2, fig. 2 shows a system architecture block diagram. Here, the high-performance hardware platform corresponds to a hardware component of the system, and mainly includes: a down converter, an intermediate frequency signal recording unit and an up converter. The intermediate frequency signal recording unit 12 includes a data acquisition unit 121, an intermediate frequency processing unit 122, a main control unit 123, a data storage unit 124, and a data playback unit 125.
The data acquisition unit 121 is configured to perform a/D conversion on the intermediate frequency signal to obtain a digital intermediate frequency signal;
the intermediate frequency processing unit 122 is configured to perform signal spectrum analysis on the digital intermediate frequency signal to obtain monitoring spectrum data, and report the monitoring spectrum data to the main control unit; determining and collecting digital intermediate frequency signals corresponding to the target frequency points according to the monitoring frequency spectrum data;
the main control unit 123 is configured to display the monitored frequency spectrum data, convert the digital intermediate frequency signals corresponding to the target frequency points into data files, and store the data files in the solid state disk array by the data storage unit 124;
and the data playback unit 125 is configured to perform D/a conversion on the digital intermediate frequency signal corresponding to the target frequency point to obtain an intermediate frequency signal, and convert the intermediate frequency signal into a radio frequency signal by using an up-converter.
It should be noted that the down converter is responsible for mixing the radio frequency carrier of the micro signal to the intermediate frequency signal after the radio frequency signal is amplified and filtered by the preceding stage, and the data acquisition unit gains the intermediate frequency signal and converts the intermediate frequency signal into a digital intermediate frequency signal which is sent to the intermediate frequency acquisition processing unit.
The intermediate frequency processing unit carries out waveform synthesis, digital down-conversion, baseband waveform processing and other processing on the digital intermediate frequency signal, realizes signal spectrum analysis, obtains monitoring spectrum data, and reports the monitoring spectrum data to the main control unit; and determining a digital intermediate frequency signal corresponding to a target frequency point according to the monitoring frequency spectrum data for acquisition, wherein the target frequency point can be a time point or a time period. The invention can selectively acquire data aiming at the digital intermediate frequency signal.
The CPU main control unit realizes the operation and control of a human-computer interaction interface. And displaying the monitoring frequency spectrum data, converting the digital intermediate frequency signals corresponding to the target frequency points into data files, and recording the acquired digital intermediate frequency signals onto a hardware array in real time in an RAID array mode by using a data storage unit.
The data playback unit carries out D/A conversion on the digital intermediate frequency signals corresponding to the target frequency points to obtain intermediate frequency signals, and the intermediate frequency signals are converted into radio frequency signals by the up-converter.
For further explanation, the data acquisition unit and the data playback unit are composed of two boards: firstly, an FPGA Mezzanine Card (FMC) high-speed ADC module (as a data acquisition unit) can support the highest sampling rate of 240MSps in a single channel; and the other is an FPGA Mezzanine Card (FMC) high-speed DAC module (as a data playback unit) which can support the single channel maximum sampling rate of 240 MSps. When in use, the two board cards are installed through the high-speed connector.
Further explaining, the intermediate frequency processing unit performs signal spectrum analysis on the digital intermediate frequency signal according to preset monitoring parameters, and selects a baseband digital signal with a preset sampling rate according to requirements on spectrum bandwidth and resolution to perform FFT and power spectrum calculation to obtain monitoring spectrum data. It should be noted that the intermediate frequency processing unit can perform real-time monitoring on signals in a specified frequency band and a specified bandwidth, and monitor the characteristics of the wireless signals through frequency spectrum information. The device carries out time-frequency domain conversion calculation based on discrete Fourier transform (FFT) on the signals in the monitoring frequency band to obtain power spectrum information of the signals in the real-time bandwidth.
In addition, the main control unit generates a graphical file based on the monitoring frequency spectrum data and displays the graphical file. The method specifically comprises the following steps: the conventional frequency spectrogram, two-dimensional and three-dimensional waterfall layout are displayed in a graphical display mode, afterglow display can be carried out on signal frequency domain information through statistics according to requirements, and then frequency domain characteristics of signals are visually displayed from multiple dimensions. The signal spectrogram is used for two-dimensionally displaying a frequency point of a signal at a certain moment and energy information corresponding to the frequency point, and the frequency of general display is 25 frames to 40 frames per second; the waterfall diagram displays the spectral energy information at each moment in a time axis rolling mode.
Each component of the high-performance hardware platform is relatively independent, and standard interfaces are adopted interactively, so that development and upgrading of independent functional components are facilitated. And selecting a mature board card taking processors such as a high-performance CPU (Central processing Unit), an FPGA (field programmable Gate array) and the like as cores, and carrying out data interaction based on a high-speed PCI-E (peripheral component interconnect-express) bus. In order to meet the requirement of parallel data processing in the future, a standby PCI-E interface is reserved on the mainboard so as to expand the GPU card in the future; the high-speed data bus and the board card chip are selected, so that the requirements of current communication signal simulation equipment are met, the requirements of the function expansion and performance upgrading in the future can be met, and the life cycle of hardware is expanded as much as possible.
The standardized software platform comprises an operating system, a hardware abstraction layer, a transmission mechanism layer (a hardware abstraction layer and a middleware), a core framework layer and the like, provides services such as a PCIE bus, a software middleware, hardware abstraction and the like, realizes loose coupling of high-speed data acquisition and storage software application and a bottom layer universal hardware platform, provides convenient conditions for development of the application and portability of the application, and supports dynamic reconstruction of waveform simulation and sending functions.
The high-speed acquisition, storage and playback software application platform comprises signal monitoring software, signal acquisition and storage software and signal playback software, and each software is used for processing and displaying a time domain and a frequency domain for communication or radar echo signals received by the system. The processing of the waveform data may be based on MATLAB, C, or C + +, performing waveform display, FFT transformation, waterfall graph display, persistence display, etc. on the signal. Under an application software platform, software files in various formats can be generated, and various algorithm libraries provided in matlab and C + + are utilized for data processing.
In a further explanation of the above system, referring to fig. 3, the down-converter 11 comprises a first amplifier 111, a pre-filter 112, a first mixer 113, a first filter 114, a second amplifier 115, a second mixer 116, a second filter 117, a third amplifier 118, a gain 119 and a fourth amplifier 120, wherein:
the input end of the first amplifier is connected with a radio frequency signal, the output end of the first amplifier is connected with the input end of the pre-filter, the output end of the pre-filter is connected with the first input end of the first mixer, the second input end of the first mixer is connected with a first local oscillator signal, the output end of the first mixer is connected with the input end of the first filter, the output end of the first filter is connected with the input end of the second amplifier, the output end of the second amplifier is connected with the first input end of the second mixer, the second input end of the second mixer is connected with a second local oscillator signal, the output end of the second mixer is connected with the input end of the second filter, the output end of the second filter is connected with the input end of the third amplifier, the output end of the third amplifier is connected with the input end of the gain device, the output end of the gain device is connected with the input end of the fourth amplifier, and the output end of the fourth amplifier is connected with the data acquisition unit.
The down converter is subjected to frequency conversion twice, and high local oscillation signals are adopted in the frequency conversion twice, so that the frequency spectrum is not inverted after the frequency conversion. The input radio frequency signal is first passed through a low noise amplifier to reduce the noise figure of the frequency converter. And then the signal is mixed with a first local oscillator 8.4-13.9 GHz after passing through a pre-filter to obtain a first intermediate frequency signal of 7.9GHz, the intermediate frequency signal is mixed with a second local oscillator 8.62GHz after being filtered and amplified to obtain a second intermediate frequency signal of 720MHz, and the second intermediate frequency signal is output after being processed by filtering, amplifying, gain control and the like.
In a further explanation of the above system, the intermediate frequency processing unit comprises an N-order anti-aliasing filtering means, wherein:
and the N-order anti-aliasing filtering device is used for determining the order according to the preset effective signal bandwidth and the sampling rate, then determining the digital intermediate frequency signal corresponding to the target frequency point according to the monitoring frequency spectrum data, performing anti-aliasing filtering processing on the digital intermediate frequency signal corresponding to the target frequency point, and outputting the IQ digital signal to be sampled.
In the invention, an N-order anti-aliasing filter device can be adapted to a multi-order anti-aliasing filter device, after the order with a reasonable number t is determined from the N-order according to the preset effective signal bandwidth and the sampling rate, the filter device with the t-order anti-aliasing function is arranged according to the order t, the anti-aliasing filtering processing is carried out on the received intermediate-frequency digital signal by the determined filter device, and an IQ digital signal to be sampled is output. And carrying out subsequent sampling operation on the output IQ digital signal to be sampled.
To explain further, the anti-aliasing filtering apparatus for each order comprises a forward filtering unit including a forward mixer and a first filter, and a backward filtering unit including a backward mixer and a second filter.
Referring to fig. 4 and 5, fig. 4 is a schematic diagram of the structure of the analog-to-digital converter and the first-order anti-aliasing filter, and fig. 5 is a schematic diagram of the flow of data of the multiple-order anti-aliasing filter during the filtering process.
As can be seen in fig. 4, the anti-aliasing filtering apparatus for each order includes a forward filtering unit including a forward mixer 41 and a third filter 42, and a backward filtering unit including a backward mixer 43 and a fourth filter 44. As can be seen from fig. 5, when the signal sampling frequency is Fs 1200MSps, the sampling bit width is 12 bits, and the data is stored in 16 bits for convenience of data use, the data recording speed is 1200 × 2MB/s 2400 MB/s. After channelized receiving processing, the IQ data stream of 600MSps is obtained by means of filtering and then down-sampling, data volume statistics after considering different extraction multiples are shown in table 1, and table 1 is a summary table for recording data rates under different processing bandwidths.
| Processing bandwidth | Data type | Sampling rate | Data rate |
| 500MHz | Raw data | 1200MSps | 2400MB/s |
| 500MHz | Baseband data | 600MSps | 2400MB/s |
| 250MHz | Baseband data | 300MSps | 1200MB/s |
| 125MHz | Baseband data | 150MSps | 600MB/s |
| 62.5MHz | Baseband data | 75MSps | 300MB/s |
| 31.25MHz | Baseband data | 37.5MSps | 150MB/s |
After the anti-aliasing order is determined according to the preset effective signal bandwidth and the sampling rate, the anti-aliasing filtering processing is carried out on the intermediate frequency digital signal, and an IQ digital signal to be sampled is output, so that the processing bandwidth is reduced through digital filtering extraction, and the signal-to-noise ratio is further improved.
In the further explanation of the above system, the main control unit determines whether the digital intermediate frequency signals corresponding to the target frequency point satisfy a signal storage warning condition, and if so, sends a warning message. It should be noted that the system also supports a signal warning function, and when the acquired digital intermediate frequency signal meets a certain condition, a warning is given out to remind a user, and the user makes a decision whether to start acquisition and storage of the digital intermediate frequency signal.
According to the radio frequency signal acquisition, recording and playback system, information interaction among the down converter, the intermediate frequency signal recording unit and the up converter is established, so that an internal field test task of communication countermeasure can be guaranteed, and the simulation test capability is improved; the system can collect signal samples in real time, can return communication signals to the air to be used as real-time test signals, and has the capability of viewing, monitoring and displaying frequency spectrums.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a radio frequency signal acquisition record playback system which characterized in that, includes down converter, intermediate frequency signal recording element and up converter, wherein:
the down converter is used for receiving radio frequency signals and converting the radio frequency signals into intermediate frequency signals;
the intermediate frequency signal recording unit is used for receiving the intermediate frequency signal, converting the intermediate frequency signal into a digital intermediate frequency signal and storing the digital intermediate frequency signal in a solid-state disk array;
and the up-converter is used for receiving the intermediate frequency signal played back by the intermediate frequency signal recording unit from the solid-state disk array and converting the intermediate frequency signal into a radio frequency signal.
2. The radio frequency signal acquisition, recording and playback system according to claim 1, wherein the intermediate frequency signal recording unit includes a data acquisition unit, an intermediate frequency processing unit, a main control unit, a data storage unit, and a data playback unit, wherein:
the data acquisition unit is used for carrying out A/D conversion on the intermediate frequency signal to obtain a digital intermediate frequency signal;
the intermediate frequency processing unit is used for carrying out signal spectrum analysis on the digital intermediate frequency signal to obtain monitoring spectrum data and reporting the monitoring spectrum data to the main control unit; determining and collecting digital intermediate frequency signals corresponding to the target frequency points according to the monitoring frequency spectrum data;
the main control unit is used for displaying the monitoring frequency spectrum data, converting the digital intermediate frequency signals corresponding to the target frequency points into data files, and storing the data files in the solid-state disk array through the data storage unit;
and the data playback unit is used for performing D/A conversion on the digital intermediate frequency signals corresponding to the target frequency points to obtain intermediate frequency signals, and the intermediate frequency signals are converted into radio frequency signals by the up-converter.
3. The radio frequency signal acquisition, recording and playback system according to claim 2, wherein the intermediate frequency processing unit is specifically configured to: and performing signal spectrum analysis on the digital intermediate frequency signal according to preset monitoring parameters, and selecting a baseband digital signal with a preset sampling rate according to the requirements of spectrum bandwidth and resolution ratio to perform FFT (fast Fourier transform) and power spectrum calculation to obtain monitoring spectrum data.
4. The radio frequency signal acquisition, recording and playback system of claim 2, wherein the down converter comprises a first amplifier, a pre-filter, a first mixer, a first filter, a second amplifier, a second mixer, a second filter, a third amplifier, a booster, and a fourth amplifier, wherein:
the input end of the first amplifier is connected with a radio frequency signal, the output end of the first amplifier is connected with the input end of the pre-filter, the output end of the pre-filter is connected with the first input end of the first mixer, the second input end of the first mixer is connected with a first local oscillator signal, the output end of the first mixer is connected with the input end of the first filter, the output end of the first filter is connected with the input end of the second amplifier, the output end of the second amplifier is connected with the first input end of the second mixer, the second input end of the second mixer is connected with a second local oscillator signal, the output end of the second mixer is connected with the input end of the second filter, the output end of the second filter is connected with the input end of the third amplifier, the output end of the third amplifier is connected with the input end of the gain device, the output end of the gain device is connected with the input end of the fourth amplifier, and the output end of the fourth amplifier is connected with the data acquisition unit.
5. The radio frequency signal acquisition, recording and playback system according to claim 2, wherein the intermediate frequency processing unit includes an N-order anti-aliasing filter device, wherein:
and the N-order anti-aliasing filtering device is used for determining the order according to the preset effective signal bandwidth and the sampling rate, then determining the digital intermediate frequency signal corresponding to the target frequency point according to the monitoring frequency spectrum data, performing anti-aliasing filtering processing on the digital intermediate frequency signal corresponding to the target frequency point, and outputting the IQ digital signal to be sampled.
6. The radio frequency signal acquisition, recording and playback system according to claim 5, wherein the anti-aliasing filtering means of each order comprises a forward filtering unit and a backward filtering unit, the forward filtering unit comprises a forward mixer and a third filter, and the backward filtering unit comprises a backward mixer and a fourth filter.
7. The radio frequency signal acquisition, recording and playback system of claim 2, wherein the main control unit is further configured to: and determining whether the digital intermediate frequency signals corresponding to the target frequency points meet signal storage warning conditions, and if so, sending warning information.
8. The radio frequency signal acquisition, recording and playback system according to claim 2, wherein the main control unit is specifically configured to: and generating a graphical file based on the monitoring spectrum data, and displaying the graphical file.
9. The radio frequency signal acquisition, recording and playback system according to claim 2, wherein the up-converter is specifically configured to: and adjusting the central frequency to play back the intermediate frequency signal to obtain a radio frequency signal, and outputting the radio frequency signal.
10. The radio frequency signal acquisition, recording and playback system according to claim 2, wherein the data acquisition unit and the data playback unit respectively employ an FPGA mezzanine card high-speed ADC module and an FPGA mezzanine card high-speed DAC module.
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| CN117155456A (en) * | 2023-08-31 | 2023-12-01 | 北京中捷时代航空科技有限公司 | Array signal acquisition and playback method, system, electronic device and readable storage medium |
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