CN204790423U - Multichannel shortwave / ultrashort wave signal processing system based on FPGA - Google Patents
Multichannel shortwave / ultrashort wave signal processing system based on FPGA Download PDFInfo
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- CN204790423U CN204790423U CN201520451060.5U CN201520451060U CN204790423U CN 204790423 U CN204790423 U CN 204790423U CN 201520451060 U CN201520451060 U CN 201520451060U CN 204790423 U CN204790423 U CN 204790423U
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Abstract
The utility model discloses a multichannel shortwave / ultrashort wave signal processing system based on FPGA, including receiving module, acquisition control and processing module and customer end module, receiving module and acquisition control and processing module are connected, and acquisition control and processing module are connected with the customer end module. The utility model discloses a shortwave / the ultrashort wave intermediate frequency analog signal's of four channels high speed is gathered in real time, and the precision of system is high, and the commonality is strong, can realize through increasing many channel selector switch that more the signal of multichannel is gathered in real time according to the collection demand of reality. The utility model discloses an adopt the design philosophy of software radio, make the realization that analog signal is fast as far as possible after receiving digital, avoid the inside or the external interference that probably receive among the signal transmission process. Overcome traditional collection processing system's low -speed, defect such as unreliable, made the reliability of transmission of digital informations obtain the reinforcing, can realize the transmission including figure, pronunciation and image etc. Satisfied the current data acquisition and the demand of processing.
Description
Technical Field
The utility model belongs to the radio communication field especially relates to a multichannel shortwave/ultrashort ripples signal processing system based on FPGA.
Background
With the rapid development of computers and information science technologies, the signal processing task faced by people is heavier and heavier, and the requirements on data acquisition systems are higher and higher. Digital signal processing techniques have thus been developed and rapidly developed. The method has the advantages of flexible algorithm, strong anti-interference capability, high processing speed, accurate result and the like, and is widely applied to the fields of image processing, signal detection, software radio, industrial automation control and the like. The data acquisition and processing system is used as an application platform for realizing the digital signal processing technology, thereby being greatly developed and greatly improving the sampling rate, the processing capacity and the like.
The rapid development of the FPGA technology makes the advantage of the FPGA in signal acquisition and processing more and more obvious. The FPGA chip not only has strong logic control capability, but also has strong digital signal processing capability. The DSP module is generally integrated in the existing novel FPGA chip, and even a soft/hard core processor is embedded, and the FPGA has the advantages in the aspect of signal parallel processing, so that the signal acquisition control and processing based on the FPGA are completely possible. The signal acquisition and processing system based on the FPGA has the characteristics of short development period, flexible design, low cost, strong reliability and the like, and has very wide application prospect.
SUMMERY OF THE UTILITY MODEL
The utility model provides a multichannel shortwave/ultrashort wave signal processing system based on FPGA has high-speed real-time collection, and the precision of system is high, and advantages such as commonality are strong adopt software radio thought, can the wide application in fields such as speech signal, image processing and automated control.
The utility model provides a multichannel shortwave/ultrashort wave signal processing system based on FPGA, which comprises a receiving module, an acquisition control and processing module and a client module; the receiving module is connected with the acquisition control and processing module, and the acquisition control and processing module is connected with the client module; wherein the receiving module comprises: a radio frequency circuit and a down-conversion circuit; the output end of the radio frequency circuit is connected with the input end of the down-conversion circuit; the acquisition control and processing module comprises: the multi-channel selection circuit, the A/D conversion circuit, the FPGA and peripheral circuits thereof; the input end of the multi-channel selection circuit is connected with the output end of the down-conversion circuit; the input end of the A/D conversion circuit is connected with the output end of the multi-channel selection circuit; the input ends of the FPGA and the peripheral circuit thereof are connected with the output end of the A/D conversion circuit; the client module includes: the serial port is connected with the circuit and the upper computer module; the input end of the serial port circuit connecting circuit is connected with the output ends of the FPGA and the peripheral circuit thereof; and the input end of the upper computer module is connected with the output end of the serial port connecting circuit.
The utility model provides an among multichannel shortwave/ultrashort wave signal processing system based on FPGA, FPGA and peripheral circuit include: the device comprises an acquisition control unit, a signal processing unit, a storage control unit and a memory unit; the acquisition control unit is connected with the signal processing unit; the signal processing unit is connected with the storage control unit; the storage control unit is connected with the memory unit.
The utility model provides an among the multichannel shortwave/ultrashort wave signal processing system based on FPGA, FPGA is the EP2C35F672C6N of ALTERA's cyclonei series.
The utility model provides an among the multichannel shortwave/ultrashort wave signal processing system based on FPGA, the memory cell is the Flash memory outside the piece.
The utility model provides an among the multichannel shortwave/ultrashort wave signal processing system based on FPGA, multichannel selection circuit is 16 multichannel option switch AD7506 of way.
The utility model provides an among the multichannel shortwave/ultrashort wave signal processing system based on FPGA, AD converting circuit is the AD7862 of 12 positions of double-circuit.
The utility model provides an among the multichannel shortwave/ultrashort wave signal processing system based on FPGA, host computer module adopts MATLAB language to compile graphical user interface, the waveform and the frequency parameter of each channel signal of interface display.
The utility model provides a multichannel shortwave/ultrashort wave signal processing system's processing method, including following step:
the method comprises the following steps: frequency selection, filtering and amplification are carried out on the received short wave/ultrashort wave target signal through a radio frequency circuit, and a high-frequency signal is converted into an intermediate-frequency signal through a down-conversion module;
step two: the FPGA and the peripheral circuit thereof control the multi-channel selection circuit to complete the selection of the multi-channel analog signals, and control the A/D conversion circuit to convert the selected multi-channel analog signals into digital signals and send the digital signals into the FPGA for FFT processing;
step three: and uploading the processed signal data to an upper computer module through a serial port connecting circuit, and displaying the related parameters through a visual interface of the upper computer module.
Wherein the second step comprises:
step a: the acquisition control unit generates a logic control signal to control the multichannel selection circuit to complete the selection of the multichannel analog signals, and controls the A/D conversion circuit to generate a working time sequence to convert the selected multichannel analog signals into digital signals and send the digital signals to the FPGA for FFT processing;
step b: the storage control unit generates a logic control signal and stores the signal after the FFT processing in the memory unit;
step c: and outputting the signal data stored in the memory unit by setting an overflow parameter.
The utility model discloses an adopt four multichannel selector switch AD7506, realized the high-speed real-time collection of the shortwave/ultrashort wave intermediate frequency analog signal of four-channel, the precision of system is high, and the commonality is strong, can realize the signal real-time collection of more passageways through simply increasing multichannel selector switch according to the collection demand of reality.
The utility model discloses multichannel shortwave/ultrashort wave signal processing system based on FPGA through the design philosophy that adopts the software radio, makes the analog signal after receiving as fast as possible realize the digitization, avoids the inside or external interference that probably receives among the signal transmission process. The defects of low speed, unreliability and the like of the traditional acquisition processing system are overcome, the reliability of data transmission is enhanced, the transmission of graphs, voice, images and the like can be realized, and the requirements of the existing data acquisition and processing are met.
The utility model discloses can be applied to in the signal acquisition and the processing of fields such as industrial automation control, water conservancy regimen monitoring, electric power emergency communication of shortwave/ultrashort wave communication.
Drawings
Fig. 1 is the utility model discloses multichannel shortwave/ultrashort wave signal processing system's schematic structure based on FPGA.
Fig. 2 is the utility model discloses acquisition control and processing module's schematic structure among multichannel shortwave/ultrashort wave signal processing system based on FPGA.
Fig. 3 is the utility model discloses visual interface's of host computer blueprint among multichannel shortwave/ultrashort wave signal processing system based on FPGA.
Detailed Description
The present invention will be described in further detail with reference to the following specific examples and the accompanying drawings. The procedures, conditions, experimental methods and the like for carrying out the present invention are common knowledge and common general knowledge in the art except for the contents mentioned specifically below, and the present invention is not particularly limited.
The "module" involved in the present invention refers to the chip and its connection circuit of the internal burning program or the inherent program, and the burning program or the inherent program in the chip is the prior known technology.
Fig. 1 is the utility model discloses multichannel shortwave/ultrashort wave signal processing system's overall structure frame based on FPGA. The utility model discloses a: a receiving module 100, an acquisition control and processing module 200 and a client module 300.
The receiving module 100 is connected to the acquisition control and processing module 200, the acquisition control and processing module 200 is connected to the client module 300, and the receiving module 100 is configured to receive the short-wave/ultra-short-wave target signal and perform corresponding frequency conversion processing. The acquisition control and processing module 200 is a control core of the whole system, and related functional modules of the control system complete the acquisition and processing tasks of signals. The client module 300 mainly performs visual display on the acquired relevant waveforms, frequencies and the like of the multipath signals, and presents the waveforms, the frequencies and the like to a system manager more intuitively.
Referring to fig. 1, the receiving module 100 includes: the radio frequency circuit 110 and the down-conversion circuit 120, the radio frequency circuit 110 is used for performing frequency selection, filtering, amplification and the like on a target signal, and the down-conversion module 120 is used for converting a high-frequency short wave/ultra-short wave signal into an intermediate frequency signal which can be processed by the acquisition control and processing module 200.
Referring to fig. 1, the acquisition control and processing module 200 includes: a multi-channel selection circuit 210, an A/D conversion circuit 220, and an FPGA and its peripheral circuits 230. When the system works, a plurality of paths of analog signals firstly pass through the multi-channel selection circuit 210 and the A/D conversion circuit 220, the acquisition control unit 231 generates a logic control signal for controlling the working time sequence of the A/D conversion and carrying out the multi-channel selection by controlling the multi-channel selection circuit 210 and the A/D conversion circuit 220, the selection of the plurality of paths of analog signals is completed, and the A/D conversion is carried out on the selected plurality of paths of analog signals. The digital signal after a/D conversion is sent to the FPGA for FFT processing, and finally the storage control unit 233 generates a logic control signal of the memory unit 234, and stores the signal after FFT processing.
Referring to fig. 1, the client module 300 includes: the storage control unit 233 in the acquisition control and processing module 200 stores signals processed by FFT by generating logic control signals, and uploads the stored signal data to the upper computer module 320 through the serial port connection circuit 310 by setting certain overflow parameters, and displays related parameters through a visual interface of the upper computer.
The structure and function of the acquisition control and processing module 200 will be further described with reference to fig. 2.
The utility model discloses select 16 multichannel option switch AD7506, effectively control AD 7506's operating condition through control enable end high level. And grouping the collected signal input channels according to the number of signal paths to be collected, so that the channels of the multi-channel analog input signals are selected through a plurality of AD7506 channels. And the FPGA controls and generates chip selection signals and channel selection timing signals required by the AD 7506.
The a/D conversion circuit 220 is used to convert the collected analog signal into a digital signal, so that the digital signal can be processed by the following signal processing module. The utility model discloses select the AD conversion chip AD7862 of 12 positions of double-circuit, this chip internal integration two 12 bit AD converters that can simultaneous working, can accomplish 2 way analog signal of arbitrary a set of passageway in two sets of channel signals and sample simultaneously, conversion time is about 4 us. The FPGA generates a chip selection signal, a multi-path selection signal, a reading control signal and a CONVST signal, so that the AD7862 is controlled to complete conversion from an analog signal to a digital signal. And the converted digital signals send data to the FPGA through a data bus to carry out FFT processing.
Correlation, filtering, spectrum estimation, convolution and the like in digital signal processing can be realized by Discrete Fourier Transform (DFT), the DFT is an important transformation tool for realizing processing of digital signals such as graphics, voice, images and the like, and the Fast Fourier Transform (FFT) is a fast algorithm of the DFT. The digital signal after A/D conversion enters the FPGA to realize the FFT algorithm of 1024 points, thereby finishing the digital signal processing.
The utility model relates to a need use the memory in for the signal after the storage process digital signal processing also as the transition before uploading the host computer simultaneously. The utility model discloses in EP2C35F672C6N model of ALTERA's cyclonei series that uses, it contains 105M 4KRAM pieces on its piece, and the access speed of FPGA's on-chip memory is fast, and it is very convenient to use, but the memory space is limited, generally can only be used for saving a small amount of data. Use the piece internal storage to also occupy FPGA's partly logic resource simultaneously, so the utility model discloses an off-chip Flash memory.
Referring to fig. 1, the client module 300 includes a serial port connection circuit 310 and an upper computer module 320. Data processed by digital signals are stored in an off-chip Flash, certain overflow parameters are set in the FPGA, and when the stored data reach an overflow value, the data are uploaded to an upper computer through a serial port connection circuit.
Referring to fig. 3, a visual graphical user interface of the upper computer is implemented by an MATLAB programming language, a displayed interface is designed according to the number of signal channels to be acquired, and the graphical user interface is mainly used for displaying parameters such as waveforms, frequencies and the like of the signals of each channel after digital processing.
The utility model provides a multichannel shortwave/ultrashort wave signal processing system's processing method based on FPGA, including following step:
the method comprises the following steps: the frequency selection, filtering and amplification are carried out on the received short wave/ultra-short wave target signal through the radio frequency circuit 110, and the high-frequency signal is converted into an intermediate-frequency signal through the down-conversion module 120;
step two: the FPGA and its peripheral circuit 230 controls the multi-channel selection circuit 210 to complete the selection of the multi-channel analog signal, and controls the a/D conversion circuit 220 to convert the selected multi-channel analog signal into a digital signal and send the digital signal to the FPGA for FFT processing;
step three: the processed signal data is uploaded to the upper computer module 320 through the serial port connection circuit 310, and the related parameters are displayed through a visual interface of the upper computer module 320.
Wherein, step two includes:
step a: the acquisition control unit 231 generates a logic control signal to control the multichannel selection circuit 210 to complete the selection of the multichannel analog signals, and controls the A/D conversion circuit 220 to generate a working time sequence to convert the selected multichannel analog signals into digital signals and send the digital signals to the FPGA for FFT processing;
step b: the storage control unit 233 generates a logic control signal, and stores the FFT-processed signal in the memory unit 234;
step c: the signal data stored in the memory unit 234 is output by setting the overflow parameter.
The utility model discloses be particularly useful for traditional shortwave/ultrashort wave data transfer communication field, like industrial control, water conservancy control etc. for other radio communication like GPRS, satellite communication etc. shortwave/ultrashort wave direct-emitting wave communication, its channel parameter can regard as invariable in long time within range, therefore ultrashort/shortwave communication is more reliable also simpler, more stable. Compared with the traditional control and processing system based on a single chip microcomputer as a core, the clock frequency is low, the clock frequency is mainly realized by software operation, the efficiency is relatively low, and the acquisition requirements of high speed and high reliability are difficult to meet. While the DSP has a strong digital signal processing capability and is good at mass data processing, it is difficult to complete the control of the peripheral complex logic devices. The excellent performance of the FPGA not only meets the signal processing requirements of high speed and high reliability, but also has a strong logic control function. Therefore, the utility model discloses can accomplish the signal acquisition and the processing function in relevant field well, have wide application prospect.
Examples
In a tap water supply system of a certain city, the city is provided with 4 water plants, 12 pressure monitoring stations and 8 flow monitoring stations, wherein the 4 water plants are branch control rooms and respectively monitor the pressure and the flow monitoring stations, and the city is also provided with a master control center. The main monitoring station is connected with the 4 sub-control rooms through wireless communication, and the 4 sub-control rooms are respectively connected with the pressure and flow monitoring stations, so that centralized management and decentralized control are realized, centralized danger degree of a centralized control system is avoided, the centralized control system is poor in reliability and difficult to expand, and the reliability of the system is fundamentally improved. In the existing water supply system, in order to monitor the conditions (flow rate/pressure) of the equipment distributed at different positions, the signals collected by the sensors distributed at the positions need to be uploaded to a monitoring center in real time. At present, remote transmission has a plurality of modes, wired communication or wireless CDMA/GPRS communication mode is adopted, but from the view of special geographic environment and operation and maintenance cost of a water supply system, short wave/ultra-short wave wireless transmission mode can be selected. In combination with practical application conditions, a water plant consists of a control center and a plurality of monitoring stations, so that when in communication networking, the sub-monitoring stations are provided with antennas for transmitting signals in a mode that the control center is used for the plurality of sub-monitoring stations, and the control center is provided with a directional antenna for receiving and transmitting response signals. The water supply system is one of the core functions of a city, monitoring of the water supply system must have good real-time response and processing capacity, high transmission rate, low construction cost, wide coverage range and the like, and the ultrashort wave communication can completely meet the requirements by virtue of good performance. Each pressure and flow monitoring station of the system is provided with a sensor and information transmission equipment, and in the existing system monitoring, a set of signal receiving and processing device needs to be respectively arranged in a sub-monitoring center or a main monitoring room aiming at each monitoring pair, and then the signals are processed and then uploaded to an upper computer for displaying. Such an arrangement requires a large amount of cost to add receiving and processing equipment, and the efficiency of practical use is low.
The utility model discloses in, through the analog-to-digital conversion chip AD7862 who uses a plurality of 16 way multichannel option switch AD7506 and 4 passageway 12 bits, divide monitoring station signal not through handling directly to send into multichannel option switch circuit with each that the control center is received, the collection control module that this design can be realized has 64 way collection signal's input channel, divide into 4 groups with it, and every 16 are a set of, utilize 4 AD7506 to realize the channel selection to 64 way analog input signal. Then the signals are accessed into an AD7862 circuit for centralized parallel processing, the AD7862 can complete simultaneous sampling of 2-channel analog signals of any one of two groups of channel signals, and the functions of signal acquisition, processing, storage and the like of each channel are realized by controlling a multi-channel selection switch through an FPGA.
The utility model discloses a processing mode has saved a large amount of processing links among control center's the receipt and the processing apparatus, carries out centralized processing through the signal after receiving each, has realized the high-speed parallel processing of signal, has increased reliability, maintainability of system, is showing the construction cost of lowering system.
The protection of the present invention is not limited to the above embodiments. Variations and advantages that may occur to those skilled in the art may be incorporated into the invention without departing from the spirit and scope of the inventive concept, and the scope of the appended claims is intended to be protected.
Claims (6)
1. Multichannel shortwave/ultrashort wave signal processing system based on FPGA, its characterized in that includes: the system comprises a receiving module (100), an acquisition control and processing module (200) and a client module (300); the receiving module (100) is connected with the acquisition control and processing module (200), and the acquisition control and processing module (200) is connected with the client module (300); wherein,
the receiving module (100) comprises: a radio frequency circuit (110) and a down-conversion circuit (120); the output end of the radio frequency circuit (110) is connected with the input end of the down-conversion circuit (120);
the acquisition control and processing module (200) comprises: a multi-channel selection circuit (210), an A/D conversion circuit (220), an FPGA and a peripheral circuit (230) thereof; the input end of the multi-channel selection circuit (210) is connected with the output end of the down-conversion circuit (120); the input end of the A/D conversion circuit (220) is connected with the output end of the multi-channel selection circuit (210); the input end of the FPGA and the peripheral circuit (230) thereof is connected with the output end of the A/D conversion circuit (220);
the client module (300) comprises: the serial port connecting circuit (310) is connected with the upper computer module (320); the input end of the serial port circuit connecting circuit (310) is connected with the output ends of the FPGA and the peripheral circuit (230) thereof; the input end of the upper computer module (320) is connected with the output end of the serial port connection circuit (310).
2. The FPGA-based multi-channel shortwave/ultrashort-wave signal processing system of claim 1, wherein the FPGA and its peripheral circuits (230) comprise: an acquisition control unit (231), a signal processing unit (232), a storage control unit (233) and a memory unit (234); wherein the acquisition control unit (231) is connected with the signal processing unit (232); the signal processing unit (232) is connected with the storage control unit (233); the memory control unit (233) is connected to the memory unit (234).
3. The FPGA-based multi-channel shortwave/ultrashort wave signal processing system of claim 2 wherein the FPGA is EP2C35F672C6N of the cycleei series of ALTERA.
4. The FPGA-based multi-channel shortwave/ultrashort-wave signal processing system of claim 2 wherein the memory unit (234) is an off-chip Flash memory.
5. The FPGA-based multi-channel shortwave/ultrashort-wave signal processing system of claim 1, wherein the multi-channel selection circuit (210) is a 16-channel selection switch AD 7506.
6. The FPGA-based multi-channel shortwave/ultrashort-wave signal processing system of claim 1 wherein the a/D conversion circuit (220) is a two-way 12-bit AD 7862.
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