CN103501424A - TDMA+TDD model high-speed image transmitting system, communication control method and working method - Google Patents
TDMA+TDD model high-speed image transmitting system, communication control method and working method Download PDFInfo
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Abstract
The invention provides a TDMA+TDD model high-speed image transmitting system, a communication control method and a working method. The image transmitting system is designed to be of a modular hardware structure, meets the requirements for small size, high integration level and multifunction, and is a wireless transmission system which is high-performance and capable of transmitting data signals at high speed. The image transmitting system integrates high quality images (including videos and pictures) and other data services and can transmit data information and video image information in real time according to a specific message format and communication protocol. A broadcasting station has TDMA+TDD both-way communication ability, can support downlink transmission of the videos (invisible light and infrared light), the pictures and SAR signals by using the same device at the same time, can also support uplink transmission of low-speed data services like reverse measurement and control data, and can support one-to-many and many-to-many video signal transmission. Therefore, spectral efficiency is high, and the demands for the current fast-changing space communication can be further met.
Description
Technical field
The present invention relates to a kind of high speed image transmission system and communication control method and method of work, particularly relate to a kind of high speed image transmission system and communication control method and method of work based on the TDMA+TDD standard.
Background technology
The development of avionics, especially the development of scounting aeroplane, UCAV, fighter plane, make the high speed image transmission technology obtain very big development, the behavior of accusing of terrestrial operation personnel's great majority is all to judge according to the high definition real time video image of passback.Thus, high speed figure transmission/communication system is the eyes of unmanned plane or other unmanned vehicle.
The transmitted in both directions of image, speech, data service is the key technology of high speed figure transmission/communication system (hereinafter to be referred as image transmission system).Existing image transmission system great majority are only supported the one-way video data stream transmitting, or rely on Frequency Division Duplexing (FDD) (Frequency Division Duplexing, FDD) standard to realize the transmitted in both directions of video, data, and the availability of frequency spectrum is lower with day line use ratio.The simple two bill receipts systems of take are example, and transmit leg needs 4 antennas (2 send, 2 receptions), and the recipient also needs 4 antennas just can complete the two-way communication of this system.This type of image transmission system hardware is complicated, cost is higher, and the availability of frequency spectrum is lower simultaneously, can only realize point-to-point communication.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of TDMA+TDD standard high speed image transmission system and communication control method and method of work, thereby realizes the image on a channel, the duplex transmission of data service.This technology is different from other graphic transmission equipments and only supports unidirectional, single transmission of video, or only relies on FDD to adopt double antenna, can only realize that the mode of point-to-point communication meets defect two-way, the group-net communication demand.
The technical solution used in the present invention is as follows: a kind of TDMA+TDD standard high speed image transmission system, it is characterized in that: comprise that the figure be connected with airborne antenna 1 and video camera 4 respectively passes airborne station 3, the figure be connected with monitor 6 with earth station antenna 2 respectively passes ground station radio station 5, and figure passes airborne station 3 and figure biography ground station radio station 5 completes mutual communication by airborne antenna 1 and earth station antenna 2.
As preferably, described figure passes airborne station 3 and comprises the first ifd module and the first radio-frequency module; Described the first ifd module comprises the first power supply base plate 311, the first image processing board 312 and a FPGA signal-processing board 313; Described the first radio-frequency module comprises first receiver module the 321, first frequently comprehensive module 322 and the first power amplifier module 323; Described video camera 4, the first image processing template 312, a FPGA signal-processing board 313, the first receiver module 321, the first power amplifier module 323 are connected successively with airborne antenna 1; Described first combines module 322 frequently is connected with the first power amplifier module 323 with the first receipts machine module 321 respectively.
As preferably, described figure passes ground station radio station 5 and comprises the second ifd module and the second radio-frequency module; Described the second ifd module comprises second source plate 511, the second image processing board 512 and the 2nd FPGA signal-processing board 513; Described the second radio-frequency module comprises second receiver module the 521, second frequently comprehensive module 522 and the second power amplifier module 523; Described earth station antenna 2, the second power amplifier module 523, the second receiver module 521, the 2nd FPGA signal-processing board 513, the second image processing board 512 are connected successively with monitor 6; Described second combines module 522 frequently is connected respectively with the second receiver module 521 with the second power amplifier module 523.
As preferably, communication control method based on said system, described figure passes airborne station 3 for slave, it is main frame that figure passes ground station radio station 5, the concrete control method that main frame is communicated by letter with slave is: uplink and downlink communication is controlled by the TDMA+TDD agreement, transmission time distributes with time slot, by the uplink/downlink frames structural design, is fixing time slot, and radio station transmission information is fixedly sending data in time slot; The valid data length sent in given time slot is long definite according to bag, and invalid data is full 0.
As preferably, the frame structure that main frame and slave send data is: guard bit ︱ frame head ︱ wraps long ︱ data ︱ guard bit.
Communication working method based on above-mentioned control method, the concrete grammar step is: step 1, power on after, main frame, in the slot time of regulation, sends known synchronous head and control information, and, after data are sent, switches to immediately accepting state; After step 2, slave start, the synchronous head that constantly base unit search sends, if synchronous head detected enter next step, otherwise always in accepting state; Step 3, slave carry out demodulation to control information and judge that whether cycle period calculated value cnt reaches setting frame number threshold value, is to enter next step, otherwise continues transfer of data; Step 4, slave proceed to reset mode, enter the transfer of data of next frame.
As preferably, described reiving/transmitting state is controlled by PTT, and when PTT is high level 1, main frame is in emission state, and slave is in accepting state; And PTT is while being low level 0, main frame is in accepting state, and slave is in emission state.
As preferably, main frame adopts different modulation systems from slave.
As preferably, main frame and slave, when emission state, all comprise the free time, send frame head, send data and send the protected data one of four states.
As preferably, descending employing DQPSK modulation, code check 3Mbit/s, up employing MSK modulation, code check 60kbit/s; Single time slot length is 8962.16ms, and wherein, the slot length of airborne single transmission is 16.5ms, and the time slot that earth station sends synchronous code and control command is 0.16ms, unidirectional aerial transmission delay 1ms.
Compared with prior art, the invention has the beneficial effects as follows: the hardware configuration volume is little, and integrated level is high, and the availability of frequency spectrum is high, meets multi-functional demand; Adopt the time division duplex communication transmission means of TDMA+TDD standard, same set of equipment is supported the downlink transfer of video (visible ray, infrared), picture, SAR signal simultaneously, also support the uplink of the low-speed data services such as reverse measuring and control data, can meet two-way point-to-point, group-net communication simultaneously, thereby more meet the current space communication needs that make rapid progress.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 be the present invention wherein the figure of an embodiment pass the airborne station structural representation.
Fig. 3 is that figure embodiment illustrated in fig. 2 passes ground station's broadcasting station structure schematic diagram.
Fig. 4 is main frame of the present invention, slave communication frame structural representation.
Fig. 5 is main frame of the present invention, slave communication work flow chart.
Fig. 6 is that the main frame emission state is controlled and transition diagram.
Fig. 7 is that the slave emission state is controlled and transition diagram.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Disclosed all features in this specification, except the feature of mutual eliminating, all can combine by any way.
Disclosed arbitrary feature in this specification (comprising any accessory claim, summary and accompanying drawing), unless special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is,, unless special narration, each feature is an example in a series of equivalences or similar characteristics.
The present invention is directed to time division duplex (TDD) technology and time division multiple access (TDMA) technology of high speed signal (Mbps level), realize duplex transmission and the group-net communication of image, data service.This system only adopts an antenna, a set of transceiver, can realize the duplexing group-net communication of data, image on a frequency.
As shown in Figure 1, a kind of TDMA+TDD standard high speed image transmission system, comprise that the figure be connected with airborne antenna 1 and video camera 4 respectively passes airborne station 3, the figure be connected with monitor 6 with earth station antenna 2 respectively passes ground station radio station 5, and figure passes airborne station 3 and figure biography ground station radio station 5 completes mutual communication by airborne antenna 1 and earth station antenna 2.
From hardware complexity and the stability of a system, consider, image transmission system intermediate frequency, baseband signal processing module are used monolithic instead, low-power consumption FPGA is realized.Wherein figure passes airborne station 3 and schemes to pass ground station radio station 5 and realize that by the TDMA+TDD standard image and the information of charge up-downgoing group-net communication transmit.The descending information such as transmission of video, picture that are mainly used in are to ground station, up for accusing the transmission of the low-speed data service such as order, thereby realize the two-way group-net communication in space, ground.
As shown in Figure 1, system of the present invention has two kinds of mode of operations, is respectively point-to-point communication and group-net communication.This system descending is mainly used in the information such as transmission of video, picture to ground station, up for accusing the transmission of the low-speed data services such as order.There are two kinds of operating states in radio station: receive and emission.In this specific embodiment: during reception, aerial signal is carried out to the receiving demodulation processing, recover base band bitstream data or the video flowing of corresponding format, and these data are delivered to computer or monitor is shown; During emission, data to be sent are modulated, produce the 450MHz radiofrequency signal and go out through antenna transmission.
During the emission operating state, as shown in Figure 2, described figure passes airborne station 3 and comprises the first ifd module and the first radio-frequency module; Described the first ifd module comprises the first power supply base plate 311, the first image processing board 312 and a FPGA signal-processing board 313; Described the first radio-frequency module comprises first receiver module the 321, first frequently comprehensive module 322 and the first power amplifier module 323; Described video camera 4, the first image processing template 312, a FPGA signal-processing board 313, the first receiver module 321, the first power amplifier module 323 are connected successively with airborne antenna 1; Described first combines module 322 frequently is connected with the first power amplifier module 323 with the first receipts machine module 321 respectively.
In this specific embodiment, from CCD(video camera 4) audio-video signal and the control command of serial ports send into the first image processing board 312, this assembly carries out being transferred to a FPGA signal-processing board 313 after AD sampling, compression, framing, optimization process to vision signal; Vision signal after the one 313 pairs of FPGA signal-processing boards compression is modulated, and produces the 70MHz intermediate-freuqncy signal; Modulated emission medium-frequency signal upconverts to relevant work frequency (450MHz) in the first receiver module 321, and is transferred to the first power amplifier module 323; First this signal of 323 pairs of power amplifier modules amplifies and filtering is launched by the first dual-mode antenna 1 after processing; First combines module 322 frequently produces the local frequency signal to the first receiver module 321 and the first power amplifier module 323.
While receiving operating state, as shown in Figure 3, described figure passes ground station radio station 5 and comprises the second ifd module and the second radio-frequency module; Described the second ifd module comprises second source plate 511, the second image processing board 512 and the 2nd FPGA signal-processing board 513; Described the second radio-frequency module comprises second receiver module the 521, second frequently comprehensive module 522 and the second power amplifier module 523; Described earth station antenna 2, the second power amplifier module 523, the second receiver module 521, the 2nd FPGA signal-processing board 513, the second image processing board 512 are connected successively with monitor 6; Described second combines module 522 frequently is connected respectively with the second receiver module 521 with the second power amplifier module 523.
In this specific embodiment, external signal is transferred to the second power amplifier module 523 by earth station antenna 2, delivers to the second receiver module 521 after transmit-receive switch; After the second receiver module 521 carries out the frequency-selecting amplification to received signal, with the local oscillation signal mixing that the second frequently comprehensive module 522 produces, carry out down-converted, the 70MHz intermediate-freuqncy signal that then output receives; This intermediate-freuqncy signal is delivered to the 2nd FPGA signal-processing board 513 and is carried out AD sampling, demodulation process; The base band data of demodulation output is sent into DSP the second image processing board 512 and is decompressed, and reverts to picture format, sends into monitor 6 and shows.
Figure passes airborne station 3 and figure biography ground station radio station 5 forms by ifd module and radio-frequency module two large divisions.Inner integrated power supply base plate, FPGA signal-processing board and image processing board of ifd module wherein, radio-frequency module is inner integrated receiver module, combine module and power amplifier module frequently.
And this system image processing module not only provides a road BNC(composite video) input/output interface, and a serial ports and a network interface are provided.Directly export host computer to by network interface, show in real time two width image and control informations.
Power panel provides radio-frequency module 68 core interfaces, IF board connecting interface, external power source and control box input interface, exports each module required voltage of radio station (comprising+5V+12V ,+27V) simultaneously.
The FPGA signal-processing board is realized QPSK, MSK modulation /demodulation, Digital up and down convert, A/D, D/A, TDMA upper-layer protocol, image treatment S PI interface protocol, image processing board 5V power supply etc.
Image processing board completes A/D, D/A conversion, video compression, FPGA signal-processing board SPI interface, decompression, external data RS232 communication interface, the RJ45 network interface of image video signal.
Under the receiver module accepting state, produce intermediate frequency 70MHz output signal; Under emission state, process the 70MHz intermediate-freuqncy signal that the FPGA plate produces, produce the emission pumping signal.
Frequently combine module and generate reference frequency signal, produce the local frequency signal.
Power amplifier module completes a receipts/switching, pumping signal is carried out to power amplification.
As shown in Figure 4, the uplink and downlink communication of image transmission system is controlled by the TDMA+TDD agreement, and radio station sends information and circulated by the time.
Described figure passes airborne station 3 for slave, it is main frame that figure passes ground station radio station 5, the concrete control method that main frame is communicated by letter with slave is: uplink and downlink communication is controlled by the TDMA+TDD agreement, transmission time distributes with time slot, for avoiding main frame and slave communication contention aware, by the uplink/downlink frames structural design, be fixing time slot, radio station transmission information is fixedly sending data in time slot, simultaneously, airborne station can carry out two-way communication with land station; The valid data length sent in given time slot is long definite according to bag, and invalid data is full 0.
The frame structure that main frame and slave send data is: guard bit ︱ frame head ︱ wraps long ︱ data ︱ guard bit.
As shown in Figure 5, the communication working method based on above-mentioned control method, the concrete grammar step is step 1, power on after, main frame, in the slot time of regulation, sends known synchronous head and control information, and, after data are sent, switches to immediately accepting state; After step 2, slave start, the synchronous head that constantly base unit search sends, if synchronous head detected enter next step, otherwise always in accepting state; Step 3, slave carry out demodulation to control information and judge that whether cycle period calculated value cnt reaches setting frame number threshold value, is to enter next step, otherwise continues transfer of data; Step 4, slave proceed to reset mode, enter the transfer of data of next frame.
In this specific embodiment, the threshold value of described setting is 255.
All there are the two states that transmits and receive data in main frame and slave, and when main frame, when sending state, slave is in accepting state; When slave, when sending state, main frame is in accepting state.
Described reiving/transmitting state is controlled by PTT, and when PTT is high level 1, main frame is in emission state, and slave is in accepting state; And PTT is while being low level 0, main frame is in accepting state, and slave is in emission state.
Consider that image information is bursty data, and data volume is larger, thus time slot while dividing image information will take most of time slot, up-downgoing adopts different modulation systems.In this specific embodiment, descending employing DQPSK modulation, code check 3Mbit/s, up employing MSK modulation, code check 60kbit/s.Simultaneously, up-downgoing adopts different modulation systems, has effectively utilized tdma slot.
As shown in Figure 6 and Figure 7, main frame and slave, when emission state, all comprise the free time, send frame head, send data and send protected data (IDLE, SEND_HD, SEND_DATA, SEND_GUA) one of four states.The counter controls that Host Status is 3Mbit/s by clock frequency, the counter controls that slave is 600kbit/s by frequency, each state below is corresponding count value.
In time slot design in this specific embodiment, single time slot length is 8962.16ms, and wherein, the slot length of airborne single transmission is 16.5ms, and the time slot that earth station sends synchronous code and control command is 0.16ms, unidirectional aerial transmission delay 1ms.
Adopt the TDMA+TDD technology, the surface map platform that conducts electricity can not only receive and comes from aerial downstream video signal, can also the up charge order of reverse transfer, realize the control to the unmanned plane during flying device.The employing of TDMA technology, make unmanned plane and ground control's car both can realize 1 pair of 1 point-to-point communication, also can be more than 1 pair, the group-net communication of multi-to-multi.And no matter Installed System Memory at how many equipment, individual equipment only need to be equipped with common antenna can realize two-way, group-net communication on a frequency, has solved the problem that the availability of frequency spectrum is lower with day line use ratio.
Claims (10)
1. a TDMA+TDD standard high speed image transmission system, it is characterized in that: comprise that the figure be connected with airborne antenna (1) and video camera (4) respectively passes airborne station (3), the figure be connected with monitor (6) with earth station antenna (2) respectively passes ground station radio station (5), and figure passes airborne station (3) and completes mutual communication with figure biography ground station radio station (5) by airborne antenna (1) and earth station antenna (2).
2. system according to claim 1, it is characterized in that: described figure passes airborne station (3) and comprises the first ifd module and the first radio-frequency module; Described the first ifd module comprises the first power supply base plate (311), the first image processing board (312) and a FPGA signal-processing board (313); Described the first radio-frequency module comprises the first receiver module (321), the first frequently comprehensive module (322) and the first power amplifier module (323); Described video camera (4), the first image processing template (312), a FPGA signal-processing board (313), the first receiver module (321), the first power amplifier module (323) are connected successively with airborne antenna (1); Described first combines module (322) frequently is connected with the first power amplifier module (323) with the first receiver module (321) respectively.
3. system according to claim 1, it is characterized in that: described figure passes ground station radio station (5) and comprises the second ifd module and the second radio-frequency module; Described the second ifd module comprises second source plate (511), the second image processing board (512) and the 2nd FPGA signal-processing board (513); Described the second radio-frequency module comprises the second receiver module (521), the second frequently comprehensive module (522) and the second power amplifier module (523); Described earth station antenna (2), the second power amplifier module (523), the second receiver machine module (521), the 2nd FPGA signal-processing board (513), the second image processing board (512) are connected successively with monitor (6); Described second combines module (522) frequently is connected respectively with the second receiver machine module (521) with the second power amplifier module (523).
4. the communication control method based on the described system of claim 1, it is slave that described figure passes airborne station (3), it is main frame that figure passes ground station radio station (5), the concrete control method that main frame is communicated by letter with slave is: uplink and downlink communication is controlled by the TDMA+TDD agreement, transmission time distributes with time slot, by the uplink/downlink frames structural design, be fixing time slot, radio station transmission information is fixedly sending data in time slot; The valid data length sent in given time slot is long definite according to bag, and invalid data is full 0.
5. method according to claim 4, the frame structure that main frame and slave send data is: guard bit ︱ frame head ︱ wraps long ︱ data ︱ guard bit.
6. the communication working method based on control method claimed in claim 5, the concrete grammar step is: step 1, power on after, main frame the regulation slot time in, send known synchronous head and control information, and, after data are sent, switch to immediately accepting state; After step 2, slave start, the synchronous head that constantly base unit search sends, if synchronous head detected enter next step, otherwise always in accepting state; Step 3, slave carry out demodulation to control information and judge that whether cycle period calculated value cnt reaches setting frame number threshold value, is to enter next step, otherwise continues transfer of data; Step 4, slave proceed to reset mode, enter the transfer of data of next frame.
7. method according to claim 6, described reiving/transmitting state is controlled by PTT, and when PTT is high level 1, main frame is in emission state, and slave is in accepting state; And PTT is while being low level 0, main frame is in accepting state, and slave is in emission state.
8. method according to claim 6, main frame adopts different modulation systems from slave.
9. method according to claim 8, main frame and slave, when emission state, all comprise the free time, send frame head, send data and send the protected data one of four states.
10. method according to claim 9, descending employing DQPSK modulation, code check 3Mbit/s, up employing MSK modulation, code check 60kbit/s; Single time slot length is 8962.16ms, and wherein, the slot length of airborne single transmission is 16.5ms, and the time slot that earth station sends synchronous code and control command is 0.16ms, unidirectional aerial transmission delay 1ms.
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