CN103647596A - Double-receiving and double-transmitting modulator-demodulator of satellite - Google Patents
Double-receiving and double-transmitting modulator-demodulator of satellite Download PDFInfo
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- CN103647596A CN103647596A CN201310744622.0A CN201310744622A CN103647596A CN 103647596 A CN103647596 A CN 103647596A CN 201310744622 A CN201310744622 A CN 201310744622A CN 103647596 A CN103647596 A CN 103647596A
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Abstract
The invention discloses a double-receiving and double-transmitting modulator-demodulator of a satellite. The modulator-demodulator is characterized by comprising a base band modulation-demodulation unit, an L-wave band intermediate frequency unit, a monitoring unit and a power supply feed control unit, wherein the base band modulation-demodulation unit comprises two groups of digital-analog and analog-digital apparatuses arranged in parallel, a field-programmable gate array chip and an embedded processor. The embedded processor is provided with an ethernet interface, a serial data interface and a 32-bite bus wide PCI (Peripheral Component Interconnect) interface. The modulator-demodulator disclosed by the invention has the beneficial effects of being high in integration level, small in size, light in weight and strong in universality; the signal to noise ratio threshold for channel demodulation is lower than 3.5dB, and reliable communication under a low signal to noise ratio condition is ensured; the modulator-demodulator can be agilely and conveniently used by a user, the cost of renting satellite wideband resources is saved, and meanwhile, services at different rates are provided; the transmission efficiency can be effectively improved, and the bandwidth is saved.
Description
Technical field
The present invention relates to a kind of satellite modem, be specifically related to a kind of two two satellite modems of sending out of receiving, belong to technical field of satellite communication.
Background technology
Under satellite communication SCPC system, if increase far-end satellite small station, need to increase respective numbers modulator-demodulator in satellite main website.In the prior art, by a plurality of satellite modems are carried out to assembled realization.Therefore modulation /demodulation equipment exists: volume is large, Heavy Weight, integrated level is low, versatility is poor problem.
Summary of the invention
For solving the deficiencies in the prior art, the object of the present invention is to provide that a kind of integrated level is high, volume is little, lightweight, highly versatile, efficiency of transmission are high, save bandwidth twoly receive two satellite modems of sending out.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
Two pair satellite modem of receiving, is characterized in that, comprising:
Baseband modulation and demodulation unit: the data that L-band intermediate frequency unit is sent here are carried out modulation /demodulation, chnnel coding and decoding, synchronous, digital phase-locked loop, large frequency offset correction and modulus, digital-to-analogue conversion;
L-band intermediate frequency unit: comprise L-band modulating unit and L-band demodulating unit, there are two two intermediate-frequency channels of sending out of receiving, can provide 10M clock reference and DC power supply to power amplifier and LNB radio-frequency apparatus, give baseband modulation and demodulation unit after high-frequency signal is done to intermediate frequency process;
Monitoring unit: modem parameter is arranged to the operating state of modulation demodulator;
Power feed control unit: the output voltage of power supply is switched to output 24V or 18V direct voltage.
Aforesaid two two satellite modems of sending out of receiving, is characterized in that, aforementioned baseband modulation and demodulation unit comprises:
Digital-to-analogue, modulus device: parallel is provided with two groups, and the data that L-band intermediate frequency unit is sent here are carried out modulus, digital-to-analogue conversion;
Field programmable gate array chip: the data after modulus, digital-to-analogue conversion are carried out to modulation /demodulation, chnnel coding and decoding, synchronous, digital phase-locked loop, large frequency offset correction;
Flush bonding processor: the data that fpga chip is sent here are unpacked and organized bag, reduction IP packet, and give upper-layer user or service terminal.
Aforesaid two two satellite modems of sending out of receiving, is characterized in that, aforementioned flush bonding processor has Ethernet interface, serial data interface and 32 highway width pci interfaces.
Aforesaid two two satellite modems of sending out of receiving, is characterized in that, aforementioned flush bonding processor is also circumscribed with synchronous DRAM more than 256MB, flash memory more than 16MB.
Aforesaid two two satellite modems of sending out of receiving, is characterized in that, aforementioned monitoring unit comprises: keyboard, display screen and status indicator lamp.
Usefulness of the present invention is: integrated level is high, volume is little, lightweight, highly versatile; Can guarantee that channel demodulation signal-noise ratio threshold is lower than 3.5dB, and guarantee the reliable communication under Low SNR; Can be user the use of putting flexibly is just provided, save leased satellite bandwidth resources expense, simultaneously for providing different rates business to provide safeguard; Can effectively improve efficiency of transmission, save bandwidth.
Accompanying drawing explanation
Fig. 1 is two two composition schematic diagrames of sending out satellite modem of receiving of the present invention;
Fig. 2 is the composition schematic diagram of baseband modulation and demodulation unit in Fig. 1, and this baseband modulation and demodulation unit is connected with L-band intermediate frequency unit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is done to concrete introduction.
With reference to Fig. 1, two two satellite modems of sending out of receiving of the present invention, comprising: baseband modulation and demodulation unit, L-band intermediate frequency unit, monitoring unit and power feed control unit, wherein,
1, baseband modulation and demodulation unit carries out modulation /demodulation, chnnel coding and decoding, synchronous, digital phase-locked loop, large frequency deviation calibration and modulus, digital-to-analogue conversion for data that L-band intermediate frequency unit is sent here.
As a kind of preferred scheme, with reference to Fig. 2, baseband modulation and demodulation unit comprises: digital-to-analogue, modulus device, and field programmable gate array chip (abbreviation fpga chip) and flush bonding processor, wherein:
(1) digital-to-analogue, modulus device carry out modulus, digital-to-analogue conversion for the data that L-band intermediate frequency unit is sent here, and what it was parallel is provided with two groups, can effectively improve the integrated level of single-board device.
(2) fpga chip is for carrying out the data after modulus, digital-to-analogue conversion modulation /demodulation, chnnel coding and decoding, synchronous, digital phase-locked loop, large frequency deviation calibration, and preferably capacity is large, the chip that speed is high.
On fpga chip, be connected with clock and serial data interface.
(3) what flush bonding processor adopted is network processing unit, for the data that fpga chip is sent here, unpack and organize bag, and reduction IP packet, and give upper-layer user or service terminal.
Flush bonding processor has Ethernet interface, serial data interface and 32 highway width pci interfaces, thereby high-speed transfer passage and high-speed data throughput can be provided.
As a kind of preferred scheme, flush bonding processor is also circumscribed with synchronous DRAM more than 256MB, flash memory more than 16MB, plays the effect of good buffering and exchanges data, thereby has accelerated data processing.
2, L-band intermediate frequency unit, for high-frequency signal is done to intermediate frequency process, is then given baseband modulation and demodulation unit by the data of handling.
L-band intermediate frequency unit comprises: L-band modulating unit and L-band demodulating unit.L-band intermediate frequency unit has two two intermediate-frequency channels of sending out of receiving, and can realize the functions such as intermediate frequency quadrature modulation, demodulation, automatic gain control, and can provide 10M clock reference and DC power supply to power amplifier and LNB radio-frequency apparatus.
3, monitoring unit is used for modem parameter to arrange, and the operating state of modulation demodulator.
As a kind of preferred scheme, monitoring unit comprises: keyboard, display screen and status indicator lamp, and keyboard is for modem parameter is arranged, and display screen and status indicator lamp are for the operating state of modulation demodulator.
4, power feed control unit, for the output voltage of Switching power, is finally exported 24V/10A or 18V direct voltage, and this direct voltage is for powering to power amplifier and LNB.
Two two satellite modems of sending out of receiving of the present invention, the operation principle of its modulation /demodulation is:
(1) modulation operation principle:
User data is given the flush bonding processor of baseband modulation and demodulation unit by Ethernet interface, through being packaged into data flow, give fpga chip, through coding, modulation, change into zero intermediate frequency signals and give L-band intermediate frequency unit, then through orthogonal transform, become intermediate-freuqncy signal to send by up-conversion power amplifier BUC to send.
(2) demodulation operation principle:
The signal that low noise block downconverter is received converts intermediate-freuqncy signal to, delivers to L-band intermediate frequency unit, through converting zero intermediate frequency signals to, gives baseband modulation and demodulation unit and processes, and the IP data after processing are sent to business device.
Two two satellite modems of sending out of receiving of the present invention, its optimum Working is:
(1) central station is communicated by letter with a remote terminal
1. the TDM signaling that remote terminal modulator-demodulator receiving center station signaling modulation demodulator sends, sends STDMA burst signaling, carries out Signalling exchange and sets up link with central station modulator-demodulator.
2. webmaster is to setting up carrier wave between the central station intercoming mutually and remote terminal.
3. after standby service carrier wave is set up, central station modulator-demodulator 0 tunnel receives the TDM signaling that signaling modulation demodulator sends, and 1 tunnel receives the traffic carrier of remote terminal modulator-demodulator.
(2) central station is communicated by letter with two remote terminals
1. the TDM signaling that remote terminal modulator-demodulator receiving center station signaling modulation demodulator sends, sends STDMA burst signaling, carries out Signalling exchange and sets up link with central station modulator-demodulator.
2. webmaster is to setting up carrier wave between the central station intercoming mutually and remote terminal.
3. after standby service carrier wave is set up, central station modulator-demodulator 0 tunnel receives the traffic carrier of remote terminal 1 modulator-demodulator, and 1 tunnel receives the traffic carrier of remote terminal 2 modulator-demodulators.
(3) remote terminal is communicated by letter with remote terminal
1. the TDM signaling that remote terminal modulator-demodulator receiving center station signaling modulation demodulator sends, sends STDMA burst signaling, carries out Signalling exchange and sets up link with central station modulator-demodulator.
2. webmaster is to setting up carrier wave between the remote terminal intercoming mutually and remote terminal.
3., after standby service carrier wave is set up, central station modulator-demodulator is monitored the mutual signaling of remote terminal 1 modulator-demodulator and remote terminal 2 modulator-demodulators.
Because modulator-demodulator of the present invention has adopted efficient modulating-coding and variable bit rate bandwidth technology and efficient binary channels data transmission technology, so it has following beneficial effect:
(1) can guarantee that channel demodulation signal-noise ratio threshold is lower than 3.5dB;
(2) guarantee the reliable communication under Low SNR;
(3) can be user the use of putting flexibly is just provided, save leased satellite bandwidth resources expense, simultaneously for providing different rates business to provide safeguard;
(4) efficiency of transmission improves, and saves bandwidth.
It should be noted that, above-described embodiment does not limit the present invention in any form, and all employings are equal to replaces or technical scheme that the mode of equivalent transformation obtains, all drops in protection scope of the present invention.
Claims (5)
1. two pair satellite modem of receiving, is characterized in that, comprising:
Baseband modulation and demodulation unit: the data that L-band intermediate frequency unit is sent here are carried out modulation /demodulation, chnnel coding and decoding, synchronous, digital phase-locked loop, large frequency offset correction and modulus, digital-to-analogue conversion;
L-band intermediate frequency unit: comprise L-band modulating unit and L-band demodulating unit, there are two two intermediate-frequency channels of sending out of receiving, can provide 10M clock reference and DC power supply to power amplifier and LNB radio-frequency apparatus, give baseband modulation and demodulation unit after high-frequency signal is done to intermediate frequency process;
Monitoring unit: modem parameter is arranged to the operating state of modulation demodulator;
Power feed control unit: the output voltage of power supply is switched to output 24V or 18V direct voltage.
2. two two satellite modems of sending out of receiving according to claim 1, is characterized in that, described baseband modulation and demodulation unit comprises:
Digital-to-analogue, modulus device: parallel is provided with two groups, and the data that L-band intermediate frequency unit is sent here are carried out modulus, digital-to-analogue conversion;
Field programmable gate array chip: the data after modulus, digital-to-analogue conversion are carried out to modulation /demodulation, chnnel coding and decoding, synchronous, digital phase-locked loop, large frequency offset correction;
Flush bonding processor: the data that fpga chip is sent here are unpacked and organized bag, reduction IP packet, and give upper-layer user or service terminal.
3. two two satellite modems of sending out of receiving according to claim 2, is characterized in that, described flush bonding processor has Ethernet interface, serial data interface and 32 highway width pci interfaces.
4. according to the two pair satellite modem of receiving described in claim 2 or 3, it is characterized in that, described flush bonding processor is also circumscribed with synchronous DRAM more than 256MB, flash memory more than 16MB.
5. two two satellite modems of sending out of receiving according to claim 1, is characterized in that, described monitoring unit comprises: keyboard, display screen and status indicator lamp.
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| CN201310744622.0A CN103647596A (en) | 2013-12-31 | 2013-12-31 | Double-receiving and double-transmitting modulator-demodulator of satellite |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135294A (en) * | 2014-08-13 | 2014-11-05 | 中国科学院上海微系统与信息技术研究所 | E-waveband wireless transmission signal generating equipment |
| CN105450251A (en) * | 2015-12-07 | 2016-03-30 | 中国电子科技集团公司第十研究所 | Miniature double-receiving and double-sending universal terminal system level package method |
| CN109525330A (en) * | 2018-09-27 | 2019-03-26 | 南京凯瑞得信息科技有限公司 | Calibrating frequency method based on satellite motion and position frequency deviation |
| CN111404596A (en) * | 2020-03-27 | 2020-07-10 | 南京宽超通信技术有限公司 | Multifunctional controller for satellite downlink tuner |
| CN115225108A (en) * | 2022-07-25 | 2022-10-21 | 四川九洲空管科技有限责任公司 | L-band signal fusion processing system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104135294A (en) * | 2014-08-13 | 2014-11-05 | 中国科学院上海微系统与信息技术研究所 | E-waveband wireless transmission signal generating equipment |
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| CN109525330A (en) * | 2018-09-27 | 2019-03-26 | 南京凯瑞得信息科技有限公司 | Calibrating frequency method based on satellite motion and position frequency deviation |
| CN111404596A (en) * | 2020-03-27 | 2020-07-10 | 南京宽超通信技术有限公司 | Multifunctional controller for satellite downlink tuner |
| CN111404596B (en) * | 2020-03-27 | 2022-01-28 | 南京宽超通信技术有限公司 | Satellite downlink high-frequency head controller |
| CN115225108A (en) * | 2022-07-25 | 2022-10-21 | 四川九洲空管科技有限责任公司 | L-band signal fusion processing system |
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Application publication date: 20140319 |