CN103684575A - Digital intermediate frequency measurement and control platform based on embedded technology - Google Patents
Digital intermediate frequency measurement and control platform based on embedded technology Download PDFInfo
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Abstract
A digital intermediate frequency measurement and control platform based on the embedded technology comprises an FPGA, an analog-to-digital converting module, a digital-to-analog converting module, an ARM embedded processor, an embedded web server module, a matching isolating module, a storage unit, a temperature measuring circuit, and the like. The FPGA is the core device of the digital intermediate frequency measurement and control platform and used for transmitting and receiving digital intermediate frequency signals. The FPGA comprises an ARM interface module, a parameter configuration management module, a transmitting and receiving FIFO, a frame generating and counting module, a frame receiving and counting module, a code conversion module, a subcarrier modulation/demodulation module, a carrier modulation/demodulation module, a digital up and down frequency conversion module, an amplitude control module, a waveform storage module and a time mark management module. By the digital intermediate frequency measurement and control platform based on the embedded technology, digital processing of satellite measurement and control intermediate signals is achieved. In addition, the platform is compact in structure, small in size, good in portability, and suitable for being carried about by testers, and the platform can be used as comprehensive base band equipment for satellite testing.
Description
Technical field
The present invention relates to a kind of digital intermediate frequency monitoring platform based on embedded technology, belong to satellite test technical field.
Background technology
Digital intermediate frequency monitoring platform is the synthetical baseband equipment for satellite test, realized UCB(Unified C-band) and USB(Unified S-band) under observing and controlling system, the interconnection under video or intermediate frequency mode of ground checkout equipment and satellite is requisite up-downgoing passage in satellite test.
Along with space technology development, the ground observing and controlling test macro of communication satellite requires that reliability is high, function is many, system height is integrated and miniaturization, and there is functional redundancy in the baseband equipment that is applied at present satellite test, annexation is complicated, signal relaying link is many, partial parameters arranges very complicated, operation inconvenience, and with high costs.And conventional ground test synthetical baseband equipment be take industrial computer as operation platform at present, and the modulation /demodulation function of signal is completed by the signal-processing board being connected in industrial computer pci bus.There are two problems in the baseband equipment of this industrial control computer structure: first, equipment own vol is large, and quality is heavy not only causes operating efficiency low, and is prone to accidents, and cost of transportation is also very high; The more important thing is, industrial computer is after transportation, and its failure rate is also higher, affects normally carrying out of test assignment.Therefore need that a kind of system configuration is simplified, volume is little, good portability badly, and the reliable digital intermediate frequency monitoring platform method for designing of software and hardware system, to tackle the star interconnected requirement in ground in current test.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide a kind of system configuration to simplify, volume is little, the digital intermediate frequency monitoring platform based on damascene structures of good portability, realize the digitized processing of TT & C Signals of Satellite, significantly reduced the weight and volume of observing and controlling baseband equipment.
Technical solution of the present invention is: the digital intermediate frequency monitoring platform based on embedded technology, comprising: the modules such as FPGA, ARM flush bonding processor, embedded type web server module, coupling isolation module, memory cell, temperature measurement circuit.Wherein FPGA is the core devices of digital intermediate frequency monitoring platform, completed transmitting and receiving of digital medium-frequency signal, having comprised: with ARM interface module, parameter configuration management module, sending and receiving FIFO, frame generation and statistical module, frame reception and statistical module, code conversion module, sub-carrier modulation/demodulation module, carrier modulation/demodulation module, digital upper and lower frequency-variable module, amplitude control module, waveform memory module and markers administration module;
With ARM interface module: completing communicating by letter between FPGA and ARM flush bonding processor, is the bridge that FPGA communicates by letter with ARM flush bonding processor; Receive the configuration parameter that ARM flush bonding processor transmits, export to parameter configuration management module, FPGA is operated under user configured parameter; The data to be launched that ARM flush bonding processor is passed down write and send FIFO, from receive FIFO, read the data that demodulate, and for ARM flush bonding processor, read; The parameter configuration situation of FPGA, operating state, system temperature information are uploaded to ARM flush bonding processor, for user's real-time monitoring and accident analysis provides foundation;
Parameter configuration management module: receive the configuration parameter sending with ARM interface module, configuration parameter is provided to other digital signal processing modules, FPGA is operated under user configured parameter, send the parameter configuration of FPGA, operating state, device temperature to ARM interface module, for ARM flush bonding processor, read;
Sending and receiving FIFO: each transmission path all comprises one and independently sends FIFO, is used for storing the data to be sent that ARM flush bonding processor passes down; Each receiving path all comprises one and independently receives FIFO, is used for storing the data that demodulated, and for ARM flush bonding processor, reads;
Frame generates and frame sends statistical module: comprise that remote control frame generates submodule, telemetry frame generates submodule and sends statistics submodule; Wherein remote control frame generates submodule, telemetry frame generates submodule according to user configured parameter, from send FIFO, reads data to be sent, generates and sends frame, exports to code conversion module; Frame sends statistics submodule and according to remote control frame, generates the situation of submodule, telemetry frame generation submodule transmission data, and statistics has sent the content of frame, and the instruction information sending; And from markers administration module, obtain the current hardware time of equipment, the moment that statistics sends, for user's real-time monitoring and accident analysis provides foundation;
Code conversion module: receive the base band transmission code stream that remote control frame generates submodule, the output of telemetry frame generation submodule, and carry out base band code conversion according to user configured parameter, code conversion module realizes all code conversions of current Satellite TT system defined, the sub-carrier modulation module that code conversion module is exported to next stage according to user's configuration by the pcm stream after conversion is carried out sub-carrier modulation processing, also pcm stream directly can be outputed to outside, pcm stream is also exported to receive path and is formed inner ring certainly simultaneously;
Sub-carrier modulation module: receive the pcm stream of pattern conversion module output, carry out the modulation of BSPK according to the parameter of Satellite TT system defined, generate modulated subcarrier signal; The carrier modulation module that sub-carrier modulation module can be exported to next stage by the modulated subcarrier signal of generation according to user's configuration is carried out carrier modulation treatment, also BPSK modulated subcarrier signal directly can be outputed to outside, modulated subcarrier signal is also exported to receive path and is formed inner ring certainly simultaneously;
Carrier modulation module: receive the BPSK modulated subcarrier signal of sub-carrier modulation module output, carry out FM/PM modulation according to the parameter of Satellite TT system defined, generate carrier (boc) modulated signals; The Digital Up Convert module that carrier modulation module is exported to next stage by the carrier (boc) modulated signals of generation is carried out intermediate frequency process;
Digital Up Convert module: the FM/PM carrier (boc) modulated signals of reception carrier modulation module output, carries out Digital Up Convert processing according to the parameter of Satellite TT system defined, the digital medium-frequency signal that formation carrier frequency is 70MHz; The digital medium-frequency signal that Digital Up Convert module generates is exported to D/A converter module D/A after amplitude is controlled, and forms analog if signal output, and while digital medium-frequency signal is also exported to receive path and formed inner from ring;
Digital Down Converter Module: the digital medium-frequency signal that analog-to-digital conversion module A/D collects, or the inner digital medium-frequency signal from ring is after automatic gain control module is processed, and exports Digital Down Converter Module to; Digital Down Converter Module is carried out Digital Down Convert processing according to the parameter of Satellite TT system defined, forms carrier (boc) modulated signals, exports to the carrier wave solution molding piece of next stage;
Carrier wave demodulation module: receive the carrier (boc) modulated signals of Digital Down Converter Module output, carry out FM/PM carrier wave demodulation according to the parameter of Satellite TT system defined, generate the subcarrier solution molding piece that BPSK modulated subcarrier signal is exported to next stage;
Subcarrier demodulation module: the BPSK modulated subcarrier signal or the inner BPSK modulated subcarrier signal from ring that receive the output of digital carrier demodulation module, according to the parameter of Satellite TT system defined, carry out the demodulation of BPSK subcarrier, generate PCM base band code stream and export to code conversion module;
Frame receives and statistical module: comprise that remote control frame receives submodule, telemetry frame receives submodule and receiving and counting submodule; Wherein remote control frame reception submodule and telemetry frame receive submodule according to user configured frame synchronization strategy, and the base band code stream receiving is carried out to frame reception, form corresponding remote control frame or telemetry frame, deposit in and receive FIFO, for ARM flush bonding processor, read; Receiving and counting submodule according to remote control frame receive reception result that submodule and telemetry frame receive submodule to the instruction of the content receiving, the time of reception, reception number, whether there is wrong frame, leak the information such as frame and add up, for user's real-time monitoring and accident analysis provides foundation;
Waveform memory module: comprise sending waveform FIFO, receive waveform FIFO, writing three modules of memory cell; In signal process of transmitting, the digital medium-frequency signal of the BPSK modulated subcarrier signal of the pcm stream of code conversion module output, the output of sub-carrier modulation module, the output of Digital Up Convert module, after adding local time scale information, store into respectively in the different address sections that sent waveform FIFO; In signal receiving course, the pcm stream of the BPSK modulated subcarrier signal of the digital medium-frequency signal that A/D collects, the output of carrier wave demodulation module, the output of subcarrier demodulation module, after adding local time scale information, store into respectively in the different address sections that receive waveform FIFO; Write that memory cell module is responsible for sending waveform FIFO, the waveform that receives waveform FIFO storage is written in memory cell, user can be from memory cell the waveform of playback random time section, as monitoring or accident analysis;
The local zone time administration module of markers administration module: FPGA, produces the local time scale information of FPGA, for adding markers to the waveform of storage, to realize the playback of waveform; Markers administration module is supported the time service of host computer, supports host computer to read FPGA local zone time simultaneously; Markers comprises hour, minute, second, millisecond, microsecond, precision is a microsecond;
ARM flush bonding processor: receive the parameter of embedded type web server block configuration, and configuration parameter is delivered to the parameter configuration management module of FPGA; Liquid crystal display touch screen is provided, and display device current state, receives the configuration parameter from touch-screen; Realize network communication protocol, by LAN mouth and host computer, communicate, host computer data to be sent are write in FPGA, the data of FPGA demodulation are sent to host computer;
Embedded type web server module: realize embedded web server, support that user passes through web page access; Embedded web page display device current state, and receive user configured parameter;
Coupling isolation module: realize the coupling isolation of input/output interface between star ground, each road interface is all designed with electromagnetic isolation device, and there is the rear end power supply that independently power module is isolation, digitally isolate with device interior the interface being connected with satellite, do not go the same way between interface ground and isolate;
Memory cell: the time scale information adding for storing FPGA transmitting, the waveform receiving and FPGA; User can be from memory cell the waveform of playback random time section, as monitoring or accident analysis;
Temperature measurement circuit: ARM flush bonding processor is connected with 8 temperature sensors, be fixed on the main heat radiation point of cabinet inside, as power module place, FPGA place, ARM chip place, cabinet inside dividing plate place, temperature transducer uses thermo-sensitive resistor, by the relation of its resistance and temperature, by ARM flush bonding processor, calculated the temperature of current point for measuring temperature, realize the measurement to system temperature.
Described configuration parameter down biography process is: the embedded web page that user provides by embedded type web server module, the upper computer software connecting by network interface writes ARM flush bonding processor by configuration parameter, first ARM flush bonding processor resolves according to interface protocol the configuration parameter that user sends, then configuration parameter is sent to the parameter configuration management module in FPGA by bus interface, configuration parameter is deposited in FLASH simultaneously.The configuration parameter that parameter configuration management module in FPGA is sent ARM flush bonding processor is transferred to other digital signal processing modules in FPGA, and each module of FPGA is worked under user-defined parameter.When system is started shooting at every turn, ARM flush bonding processor reads last configuration parameter from FLASH, and under pass to the parameter configuration management module in FPGA, thereby make whole system keep the parameter configuration state of last start, realized state recovery function after the power-off of digital intermediate frequency monitoring platform.
The forwarding step of described digital medium-frequency signal is:
(1) ARM is stored in data to be sent in transmission FIFO in FPGA, remote control frame generates, telemetry frame generates submodule according to user configured parameter, from send FIFO, read data to be sent, generate transmission frame and export to code conversion module, after code conversion, generate PCM and send code stream;
(2) sub-carrier modulation module is carried out the modulation of BSPK by described pcm stream according to the parameter of Satellite TT system defined, generates modulated subcarrier signal;
(3) carrier modulation module is carried out FM/PM modulation by described modulated subcarrier signal according to the parameter of Satellite TT system defined, generates carrier (boc) modulated signals;
(4) Digital Up Convert module is carried out upconversion process by described carrier (boc) modulated signals, forms digital medium-frequency signal, after amplitude is controlled, exports to D/A converter module, converts analog if signal to, after overmatching isolation module, exports.
The receiving course of described digital medium-frequency signal is:
(1) analog-to-digital conversion module converts the analog if signal after coupling isolation to digital medium-frequency signal with constant sample rate, exports to FPGA;
(2) Digital Down Converter Module is carried out Digital Down Convert processing by described digital medium-frequency signal, forms carrier (boc) modulated signals;
(3) carrier wave demodulation module is carried out FM/PM demodulation by described carrier (boc) modulated signals according to the parameter of Satellite TT system defined, generates modulated subcarrier signal;
(4) subcarrier demodulation module carries out the demodulation of BPSK subcarrier by described modulated subcarrier signal according to the parameter of Satellite TT system defined, generates PCM base band code stream and exports to code conversion module;
(5) code conversion module is carried out base band code conversion by described PCM base band code, exports to the reception of remote control frame, telemetry frame reception, three submodules of receiving and counting, forms corresponding remote control frame or telemetry frame, deposits in and receives FIFO, for ARM, reads.
The present invention's advantage is compared with prior art:
(1) the present invention is based on software radio thought, embedded technology is applied in the design of digital intermediate frequency monitoring platform, synthetical baseband equipment is reduced to single circuit plate structure from industrial control computer structure, equipment has significantly on weight and volume to be cut down, be suitable for tester and carry, be especially applicable to transportation and carry out field trial.System configuration is simplified, volume is little, good portability, can be used as the synthetical baseband equipment of DFH-3 platform, No. four platforms of Dongfanghong, the test of DFH-3 enhanced platforms communication satellite, for satellite test, has practical significance.
(2) the ARM flush bonding processor that the present invention adopts and FPGA adopt bus form to communicate, an ARM flush bonding processor transmission configuration parameter and sending and receiving data, significantly alleviated communication load, can avoid operating system cause cannot realize the shortcoming of real-time operation, truly realize real time communication.
(3) the embedded type web server module that the present invention adopts realizes embedded web server, supports user by web page access equipment, has both supported user configured parameter, also display device current state in real time.The control of convenience and high-efficiency and Presentation Function have taken into full account user's user demand, user are obtained completely newly, hommization, intelligentized operating experience and status monitoring.
(4) internal system temp sensing function provided by the invention has solved the internal temperature black box problem of observing and controlling baseband equipment, make can the Real-Time Monitoring inner Current Temperatures of user, once it is abnormal to find that variations in temperature occurs, can stop immediately the use of observing and controlling baseband equipment, carry out corresponding malfunction elimination, improved the fault recognition rate of equipment, fabulous solution the blind area of the test uncertainty that causes star ground test performance to decline introducing because temperature is unstable, the fail safe that has improved star and test.
Accompanying drawing explanation
Fig. 1 is composition frame chart of the present invention;
Fig. 2 is the composition frame chart of FPGA of the present invention.
Embodiment
As shown in Figure 1, 2, a kind of digital intermediate frequency monitoring platform based on embedded technology of the present invention comprises: the modules such as FPGA, ARM flush bonding processor, embedded type web server module, coupling isolation module, memory cell, temperature measurement circuit.Wherein FPGA is the core devices of digital intermediate frequency monitoring platform, completed transmitting and receiving of digital medium-frequency signal, having comprised: with ARM interface module, parameter configuration management module, sending and receiving FIFO, frame generation and statistical module, frame reception and statistical module, code conversion module, sub-carrier modulation/demodulation module, carrier modulation/demodulation module, digital upper and lower frequency-variable module, amplitude control module, waveform memory module and markers administration module;
With ARM interface module: completing communicating by letter between FPGA and ARM flush bonding processor, is the bridge that FPGA communicates by letter with ARM flush bonding processor; Receive the configuration parameter that ARM flush bonding processor transmits, export to parameter configuration management module, FPGA is operated under user configured parameter; The data to be launched that ARM flush bonding processor is passed down write and send FIFO, from receive FIFO, read the data that demodulate, and for ARM flush bonding processor, read; The parameter configuration situation of FPGA, operating state, system temperature information are uploaded to ARM flush bonding processor, for user's real-time monitoring and accident analysis provides foundation;
Parameter configuration management module: receive the configuration parameter sending with ARM interface module, configuration parameter is provided to other digital signal processing modules, FPGA is operated under user configured parameter, send the parameter configuration of FPGA, operating state, device temperature to ARM interface module, for ARM flush bonding processor, read;
Sending and receiving FIFO: each transmission path all comprises one and independently sends FIFO, is used for storing the data to be sent that ARM flush bonding processor passes down; Each receiving path all comprises one and independently receives FIFO, is used for storing the data that demodulated, and for ARM flush bonding processor, reads;
Frame generates and frame sends statistical module: comprise that remote control frame generates submodule, telemetry frame generates submodule and sends statistics submodule; Wherein remote control frame generates submodule, telemetry frame generates submodule according to user configured parameter, from send FIFO, reads data to be sent, generates and sends frame, exports to code conversion module; Frame sends statistics submodule and according to remote control frame, generates the situation of submodule, telemetry frame generation submodule transmission data, and statistics has sent the content of frame, and the instruction information sending; And from markers administration module, obtain the current hardware time of equipment, the moment that statistics sends, for user's real-time monitoring and accident analysis provides foundation;
Code conversion module: receive the base band transmission code stream that remote control frame generates submodule, the output of telemetry frame generation submodule, and carry out base band code conversion according to user configured parameter, code conversion module realizes all code conversions of current Satellite TT system defined, the sub-carrier modulation module that code conversion module is exported to next stage according to user's configuration by the pcm stream after conversion is carried out sub-carrier modulation processing, also pcm stream directly can be outputed to outside, pcm stream is also exported to receive path and is formed inner ring certainly simultaneously;
Sub-carrier modulation module: receive the pcm stream of pattern conversion module output, carry out the modulation of BSPK according to the parameter of Satellite TT system defined, generate modulated subcarrier signal; The carrier modulation module that sub-carrier modulation module can be exported to next stage by the modulated subcarrier signal of generation according to user's configuration is carried out carrier modulation treatment, also BPSK modulated subcarrier signal directly can be outputed to outside, modulated subcarrier signal is also exported to receive path and is formed inner ring certainly simultaneously;
Carrier modulation module: receive the BPSK modulated subcarrier signal of sub-carrier modulation module output, carry out FM/PM modulation according to the parameter of Satellite TT system defined, generate carrier (boc) modulated signals; The Digital Up Convert module that carrier modulation module is exported to next stage by the carrier (boc) modulated signals of generation is carried out intermediate frequency process;
Digital Up Convert module: the FM/PM carrier (boc) modulated signals of reception carrier modulation module output, carries out Digital Up Convert processing according to the parameter of Satellite TT system defined, the digital medium-frequency signal that formation carrier frequency is 70MHz; The digital medium-frequency signal that Digital Up Convert module generates is exported to D/A converter module D/A after amplitude is controlled, and forms analog if signal output, and while digital medium-frequency signal is also exported to receive path and formed inner from ring;
Digital Down Converter Module: the digital medium-frequency signal that analog-to-digital conversion module A/D collects, or the inner digital medium-frequency signal from ring is after automatic gain control module is processed, and exports Digital Down Converter Module to; Digital Down Converter Module is carried out Digital Down Convert processing according to the parameter of Satellite TT system defined, forms carrier (boc) modulated signals, exports to the carrier wave solution molding piece of next stage;
Carrier wave demodulation module: receive the carrier (boc) modulated signals of Digital Down Converter Module output, carry out FM/PM carrier wave demodulation according to the parameter of Satellite TT system defined, generate the subcarrier solution molding piece that BPSK modulated subcarrier signal is exported to next stage;
Subcarrier demodulation module: the BPSK modulated subcarrier signal or the inner BPSK modulated subcarrier signal from ring that receive the output of digital carrier demodulation module, according to the parameter of Satellite TT system defined, carry out the demodulation of BPSK subcarrier, generate PCM base band code stream and export to code conversion module;
Frame receives and statistical module: comprise that remote control frame receives submodule, telemetry frame receives submodule and receiving and counting submodule; Wherein remote control frame reception submodule and telemetry frame receive submodule according to user configured frame synchronization strategy, and the base band code stream receiving is carried out to frame reception, form corresponding remote control frame or telemetry frame, deposit in and receive FIFO, for ARM flush bonding processor, read; Receiving and counting submodule according to remote control frame receive reception result that submodule and telemetry frame receive submodule to the instruction of the content receiving, the time of reception, reception number, whether there is wrong frame, leak the information such as frame and add up, for user's real-time monitoring and accident analysis provides foundation;
Waveform memory module: comprise sending waveform FIFO, receive waveform FIFO, writing three modules of memory cell; In signal process of transmitting, the digital medium-frequency signal of the BPSK modulated subcarrier signal of the pcm stream of code conversion module output, the output of sub-carrier modulation module, the output of Digital Up Convert module, after adding local time scale information, store into respectively in the different address sections that sent waveform FIFO; In signal receiving course, the pcm stream of the BPSK modulated subcarrier signal of the digital medium-frequency signal that A/D collects, the output of carrier wave demodulation module, the output of subcarrier demodulation module, after adding local time scale information, store into respectively in the different address sections that receive waveform FIFO; Write that memory cell module is responsible for sending waveform FIFO, the waveform that receives waveform FIFO storage is written in memory cell, user can be from memory cell the waveform of playback random time section, as monitoring or accident analysis;
The local zone time administration module of markers administration module: FPGA, produces the local time scale information of FPGA, for adding markers to the waveform of storage, to realize the playback of waveform; Markers administration module is supported the time service of host computer, supports host computer to read FPGA local zone time simultaneously; Markers comprises hour, minute, second, millisecond, microsecond, precision is a microsecond;
ARM flush bonding processor: receive the outside configuration parameter transmitting, configuration parameter is delivered to the parameter configuration management module of FPGA; Liquid crystal display touch screen is provided, and display device current state, receives the configuration parameter from touch-screen; Realize network communication protocol, by LAN mouth and host computer, communicate, host computer data to be sent are write in FPGA, the data of FPGA demodulation are sent to host computer;
Embedded type web server module: realize embedded web server, support that user passes through web page access.Embedded web page can display device current state, and receives user configured parameter;
Coupling isolation module: realize the coupling isolation of input/output interface between star ground, each road interface is all designed with electromagnetic isolation device, and there is the rear end power supply that independently power module is isolation, digitally isolate with device interior the interface being connected with satellite, do not go the same way between interface ground and isolate;
Memory cell: the time scale information adding for storing FPGA transmitting, the waveform receiving and FPGA; User can be from memory cell the waveform of playback random time section, as monitoring or accident analysis;
Temperature measurement circuit: ARM flush bonding processor is connected with 8 temperature sensors, be fixed on the main heat radiation point of cabinet inside, as power module place, FPGA place, ARM chip place, cabinet inside dividing plate etc. are located, temperature transducer uses thermo-sensitive resistor, by the relation of its resistance and temperature, by ARM, calculated the temperature of current point for measuring temperature, realize the measurement to system temperature.
The configuration parameter of FPGA down biography process is:
The embedded web page that user provides by embedded type web server module, the upper computer software connecting by network interface writes ARM flush bonding processor by configuration parameter, first ARM resolves according to interface protocol the configuration parameter that user sends, then configuration parameter is sent to the parameter configuration management module in FPGA by bus interface, configuration parameter is deposited in FLASH simultaneously.The configuration parameter that parameter configuration management module in FPGA is sent ARM is transferred to other digital signal processing modules in FPGA, and each module of FPGA is worked under user-defined parameter.
When system is started shooting at every turn, ARM flush bonding processor reads last configuration parameter from FLASH, and under pass to the parameter configuration management module in FPGA, thereby make whole system keep the parameter configuration state of last start, realized state recovery function after the power-off of digital intermediate frequency monitoring platform.
The process of transmitting of described digital medium-frequency signal is:
ARM is stored in data to be sent in transmission FIFO in FPGA, remote control frame generates, telemetry frame generates submodule according to user configured parameter, from send FIFO, read data to be sent, generate transmission frame and export to code conversion module, after code conversion, generate PCM and send code stream;
Sub-carrier modulation module is carried out the modulation of BSPK by described pcm stream according to the parameter of Satellite TT system defined, generates modulated subcarrier signal;
Carrier modulation module is carried out FM/PM modulation by described modulated subcarrier signal according to the parameter of Satellite TT system defined, generates carrier (boc) modulated signals;
Digital Up Convert module is carried out upconversion process by described carrier (boc) modulated signals, forms digital medium-frequency signal, after amplitude is controlled, exports to D/A converter module, converts analog if signal to, after overmatching isolation module, exports.
The receiving course of described digital medium-frequency signal is:
Analog-to-digital conversion module converts the analog if signal after coupling isolation to digital medium-frequency signal with constant sample rate, exports to FPGA;
Digital Down Converter Module is carried out Digital Down Convert processing by described digital medium-frequency signal, forms carrier (boc) modulated signals;
Carrier wave demodulation module is carried out FM/PM demodulation by described carrier (boc) modulated signals according to the parameter of Satellite TT system defined, generates modulated subcarrier signal;
Subcarrier demodulation module carries out the demodulation of BPSK subcarrier by described modulated subcarrier signal according to the parameter of Satellite TT system defined, generates PCM base band code stream and exports to code conversion module;
Code conversion module is carried out base band code conversion by described PCM base band code, exports to the reception of remote control frame, telemetry frame reception, three submodules of receiving and counting, forms corresponding remote control frame or telemetry frame, deposits in and receives FIFO, for ARM, reads.
In a word, the present invention is based on software radio thought, embedded technology is applied in the design of digital intermediate frequency monitoring platform, adopt the hardware configuration of ARM+FPGA, on weight and volume, have significantly and reduce, especially be applicable to transportation and carry out field trial, thering is practical value and good application prospect.
Claims (4)
1. the digital intermediate frequency monitoring platform based on embedded technology, is characterized in that comprising: FPGA(1), ARM flush bonding processor (2), embedded type web server module (3), coupling isolation module (4), memory cell (5), temperature measurement circuit module (6);
FPGA(1 wherein) be the core devices of digital intermediate frequency monitoring platform, completed transmitting and receiving of digital medium-frequency signal, comprise: with ARM interface module (10), parameter configuration management module (11), sending and receiving FIFO(12), frame generates and frame sends statistical module (13), frame receives and frame receiving and counting module (14), code conversion module (15), sub-carrier modulation/demodulation module (16), carrier modulation/demodulation module (17), numeral upper and lower frequency-variable module (18), amplitude control module (19), waveform memory module (20) (comprise and send waveform FIFO(201), receive waveform FIFO(202), write (203) three submodules of memory cell) and markers administration module (21),
With ARM interface module: completing communicating by letter between FPGA and ARM flush bonding processor, is the bridge that FPGA communicates by letter with ARM flush bonding processor; Receive the configuration parameter that ARM flush bonding processor transmits, export to parameter configuration management module, FPGA is operated under user configured parameter; The data to be launched that ARM flush bonding processor is passed down write and send FIFO, from receive FIFO, read the data that demodulate, and for ARM flush bonding processor, read; The parameter configuration situation of FPGA, operating state, system temperature information are uploaded to ARM flush bonding processor, for user's real-time monitoring and accident analysis provides foundation;
Parameter configuration management module: receive the configuration parameter sending with ARM interface module, configuration parameter is provided to other digital signal processing modules, FPGA is operated under user configured parameter, send the parameter configuration of FPGA, operating state, device temperature to ARM interface module, for ARM flush bonding processor, read;
Sending and receiving FIFO: each transmission path all comprises one and independently sends FIFO, is used for storing the data to be sent that ARM flush bonding processor passes down; Each receiving path all comprises one and independently receives FIFO, is used for storing the data that demodulated, and for ARM flush bonding processor, reads;
Frame generates and frame sends statistical module: comprise that remote control frame generates submodule, telemetry frame generates submodule and sends statistics submodule; Wherein remote control frame generates submodule, telemetry frame generates submodule according to user configured parameter, from send FIFO, reads data to be sent, generates and sends frame, exports to code conversion module; Frame sends statistics submodule and according to remote control frame, generates the situation of submodule, telemetry frame generation submodule transmission data, and statistics has sent the content of frame, and the instruction information sending; And from markers administration module, obtain the current hardware time of equipment, the moment that statistics sends, for user's real-time monitoring and accident analysis provides foundation;
Code conversion module: receive the base band transmission code stream that remote control frame generates submodule, the output of telemetry frame generation submodule, and carry out base band code conversion according to user configured parameter, code conversion module realizes all code conversions of current Satellite TT system defined, the sub-carrier modulation module that code conversion module is exported to next stage according to user's configuration by the pcm stream after conversion is carried out sub-carrier modulation processing, also pcm stream directly can be outputed to outside, pcm stream is also exported to receive path and is formed inner ring certainly simultaneously;
Sub-carrier modulation module: receive the pcm stream of pattern conversion module output, carry out the modulation of BSPK according to the parameter of Satellite TT system defined, generate modulated subcarrier signal; The carrier modulation module that sub-carrier modulation module can be exported to next stage by the modulated subcarrier signal of generation according to user's configuration is carried out carrier modulation treatment, also BPSK modulated subcarrier signal directly can be outputed to outside, modulated subcarrier signal is also exported to receive path and is formed inner ring certainly simultaneously;
Carrier modulation module: receive the BPSK modulated subcarrier signal of sub-carrier modulation module output, carry out FM/PM modulation according to the parameter of Satellite TT system defined, generate carrier (boc) modulated signals; The Digital Up Convert module that carrier modulation module is exported to next stage by the carrier (boc) modulated signals of generation is carried out intermediate frequency process;
Digital Up Convert module: the FM/PM carrier (boc) modulated signals of reception carrier modulation module output, carries out Digital Up Convert processing according to the parameter of Satellite TT system defined, the digital medium-frequency signal that formation carrier frequency is 70MHz; The digital medium-frequency signal that Digital Up Convert module generates is exported to D/A converter module D/A after amplitude is controlled, and forms analog if signal output, and while digital medium-frequency signal is also exported to receive path and formed inner from ring;
Digital Down Converter Module: the digital medium-frequency signal that analog-to-digital conversion module A/D collects, or the inner digital medium-frequency signal from ring is after automatic gain control module is processed, and exports Digital Down Converter Module to; Digital Down Converter Module is carried out Digital Down Convert processing according to the parameter of Satellite TT system defined, forms carrier (boc) modulated signals, exports to the carrier wave solution molding piece of next stage;
Carrier wave demodulation module: receive the carrier (boc) modulated signals of Digital Down Converter Module output, carry out FM/PM carrier wave demodulation according to the parameter of Satellite TT system defined, generate the subcarrier solution molding piece that BPSK modulated subcarrier signal is exported to next stage;
Subcarrier demodulation module: the BPSK modulated subcarrier signal or the inner BPSK modulated subcarrier signal from ring that receive the output of digital carrier demodulation module, according to the parameter of Satellite TT system defined, carry out the demodulation of BPSK subcarrier, generate PCM base band code stream and export to code conversion module;
Frame receives and statistical module: comprise that remote control frame receives submodule, telemetry frame receives submodule and receiving and counting submodule; Wherein remote control frame reception submodule and telemetry frame receive submodule according to user configured frame synchronization strategy, and the base band code stream receiving is carried out to frame reception, form corresponding remote control frame or telemetry frame, deposit in and receive FIFO, for ARM flush bonding processor, read; Receiving and counting submodule according to remote control frame receive reception result that submodule and telemetry frame receive submodule to the instruction of the content receiving, the time of reception, reception number, whether there is wrong frame, leak the information such as frame and add up, for user's real-time monitoring and accident analysis provides foundation;
Waveform memory module: comprise sending waveform FIFO, receive waveform FIFO, writing three modules of memory cell; In signal process of transmitting, the digital medium-frequency signal of the BPSK modulated subcarrier signal of the pcm stream of code conversion module output, the output of sub-carrier modulation module, the output of Digital Up Convert module, after adding local time scale information, store into respectively in the different address sections that sent waveform FIFO; In signal receiving course, the pcm stream of the BPSK modulated subcarrier signal of the digital medium-frequency signal that A/D collects, the output of carrier wave demodulation module, the output of subcarrier demodulation module, after adding local time scale information, store into respectively in the different address sections that receive waveform FIFO; Write that memory cell module is responsible for sending waveform FIFO, the waveform that receives waveform FIFO storage is written in memory cell, user can be from memory cell the waveform of playback random time section, as monitoring or accident analysis;
The local zone time administration module of markers administration module: FPGA, produces the local time scale information of FPGA, for adding markers to the waveform of storage, to realize the playback of waveform; Markers administration module is supported the time service of host computer, supports host computer to read FPGA local zone time simultaneously; Markers comprises hour, minute, second, millisecond, microsecond, precision is a microsecond;
ARM flush bonding processor: receive the parameter of embedded type web server block configuration, and configuration parameter is delivered to the parameter configuration management module of FPGA; Liquid crystal display touch screen is provided, and display device current state, receives the configuration parameter from touch-screen; Realize network communication protocol, by LAN mouth and host computer, communicate, host computer data to be sent are write in FPGA, the data of FPGA demodulation are sent to host computer;
Embedded type web server module: realize embedded web server, support that user passes through web page access; Embedded web page display device current state, and receive user configured parameter;
Coupling isolation module: realize the coupling isolation of input/output interface between star ground, each road interface is all designed with electromagnetic isolation device, and there is the rear end power supply that independently power module is isolation, digitally isolate with device interior the interface being connected with satellite, do not go the same way between interface ground and isolate;
Memory cell: the time scale information adding for storing FPGA transmitting, the waveform receiving and FPGA; User can be from memory cell the waveform of playback random time section, as monitoring or accident analysis;
Temperature measurement circuit: ARM flush bonding processor is connected with 8 temperature sensors, be fixed on the main heat radiation point of cabinet inside, as power module place, FPGA place, ARM chip place, cabinet inside dividing plate place, temperature transducer uses thermo-sensitive resistor, by the relation of its resistance and temperature, by ARM flush bonding processor, calculated the temperature of current point for measuring temperature, realize the measurement to system temperature.
2. the digital intermediate frequency monitoring platform based on embedded technology according to claim 1, is characterized in that: the parameter configuration management module in described FPGA be configured parameter down biography process be:
The embedded web page that user provides by embedded type web server module, the upper computer software connecting by network interface writes ARM flush bonding processor by configuration parameter, first ARM flush bonding processor resolves according to interface protocol the configuration parameter that user sends, then configuration parameter is sent to the parameter configuration management module in FPGA by bus interface, configuration parameter is deposited in FLASH simultaneously; The configuration parameter that parameter configuration management module in FPGA is sent ARM flush bonding processor is transferred to other digital signal processing modules in FPGA, and each module of FPGA is worked under user-defined parameter;
When system is started shooting at every turn, ARM flush bonding processor reads last configuration parameter from FLASH, and under pass to the parameter configuration management module in FPGA, thereby make whole system keep the parameter configuration state of last start, realized state recovery function after the power-off of digital intermediate frequency monitoring platform.
3. a kind of digital intermediate frequency monitoring platform based on embedded technology according to claim 1, is characterized in that: the process of transmitting of described digital medium-frequency signal is:
ARM is stored in data to be sent in transmission FIFO in FPGA, remote control frame generates, telemetry frame generates submodule according to user configured parameter, from send FIFO, read data to be sent, generate transmission frame and export to code conversion module, after code conversion, generate PCM and send code stream;
Sub-carrier modulation module is carried out the modulation of BSPK by described pcm stream according to the parameter of Satellite TT system defined, generates modulated subcarrier signal;
Carrier modulation module is carried out FM/PM modulation by described modulated subcarrier signal according to the parameter of Satellite TT system defined, generates carrier (boc) modulated signals;
Digital Up Convert module is carried out upconversion process by described carrier (boc) modulated signals, forms digital medium-frequency signal, after amplitude is controlled, exports to D/A converter module, converts analog if signal to, after overmatching isolation module, exports.
4. a kind of digital intermediate frequency monitoring platform based on embedded technology according to claim 1, is characterized in that: the receiving course of described digital medium-frequency signal is:
Analog-to-digital conversion module converts the analog if signal after coupling isolation to digital medium-frequency signal with constant sample rate, exports to FPGA;
Digital Down Converter Module is carried out Digital Down Convert processing by described digital medium-frequency signal, forms carrier (boc) modulated signals;
Carrier wave demodulation module is carried out FM/PM demodulation by described carrier (boc) modulated signals according to the parameter of Satellite TT system defined, generates modulated subcarrier signal;
Subcarrier demodulation module carries out the demodulation of BPSK subcarrier by described modulated subcarrier signal according to the parameter of Satellite TT system defined, generates PCM base band code stream and exports to code conversion module;
Code conversion module is carried out base band code conversion by described PCM base band code, exports to the reception of remote control frame, telemetry frame reception, three submodules of receiving and counting, forms corresponding remote control frame or telemetry frame, deposits in and receives FIFO, for ARM, reads.
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