CN104734771A - Low-elevation air-ground communication device - Google Patents
Low-elevation air-ground communication device Download PDFInfo
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- CN104734771A CN104734771A CN201510190677.0A CN201510190677A CN104734771A CN 104734771 A CN104734771 A CN 104734771A CN 201510190677 A CN201510190677 A CN 201510190677A CN 104734771 A CN104734771 A CN 104734771A
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Abstract
The invention discloses a low-elevation air-ground communication device and relates to a communication device of low-elevation air-ground communication, binary-diameter declination, and large-difference time delay power spectrum diversity reception parts in the field of communication. The low-elevation air-ground communication device comprises a dual-band antenna, a multiplexer, a dual-band transceiver, a modulator-demodulator, a baseband processing unit, a power source and the like. Based on large-difference time delay power spectrum diversity reception technology, communication interruption caused by sheltering and binary-diameter flat-fading in the low-elevation air-ground communication is effectively eliminated. The low-elevation air-ground communication device has the advantages of high anti-fading capability, high transmission quality, small size, light weight, simplicity, flexibility and the like and is particularly applicable to high-capacity communicators in the air-ground low-elevation environment.
Description
Technical field
The present invention relates to the communications field, particularly can realize the one low elevation angle that is highly reliable, flexible transmission earth-space communication device in low elevation angle earth-space communication condition.
Background technology
Current earth-space communication is all according to the design of line-of-sight microwave link transmission means, does not take effective diversity reception measure, and the simple raising communication allowance that relies on cannot be avoided equalling with two footpaths the communication disruption declining and cause because body blocks.
Summary of the invention
The object of the invention is to avoid the communication disruption problem in above-mentioned background technology under the condition of the air-ground low elevation angle.The present invention adopts a kind of based on the isolation of airborne spatial domain and big-difference time delay power spectrum diversity transmission reception technique, aircraft can be reduced in flight course because its body blocks the signal interruption phenomenon caused, also effectively can eliminate direct projection footpath in flight course and interfere with each other with reflection footpath the two footpath influence of fading caused, realize the high-quality transmission of air-ground wide-band-message.The advantages such as it has that anti-fading ability is strong, transmission quality is high, volume is little, lightweight, simple and flexible.
The object of the present invention is achieved like this:
A kind of low elevation angle earth-space communication device, comprise dual-band antenna 1, multiplexer 2, two-band transceiver 3, modulator-demodulator 4 and baseband processing unit 5, after described dual-band antenna 1 receives external wireless signals, export the discrepancy port one of multiplexer 2 through port one of coming in and going out to; Multiplexer 2 wireless signal received is isolated different frequency range obtain two-way filtering signal after by output port 4 and output port 5 corresponding input port 7 and the input port 8 exporting two-band transceiver 3 to respectively; Exported to input port 5 and the input port 6 of modulator-demodulator 4 by output port 3 and output port 4 correspondence after this two-way filtering signal is carried out down-conversion by two-band transceiver 3 respectively; Two paths of signals after down-conversion is carried out diversity merging and coherent demodulation by modulator-demodulator 4, is exported to the input port 3 of baseband processing unit 5 after recovering base-band information by output port 2; Exported by discrepancy port one after base-band information is carried out auxiliary tap and interface conversion by baseband processing unit 5;
The discrepancy port one of baseband processing unit 5 receives local information to be sent, is exported to the input port 1 of modulator-demodulator 4 after information to be sent for this locality is carried out auxiliary multiple connection and interface conversion by output port 2; By output port 3 and output port 4 corresponding input port 1 and the input port 2 exporting two-band transceiver 3 to respectively after signal after multiple connection is carried out coding and forms the different modulation signal of two-way after modulation treatment by modulator-demodulator 4; Exported to input port 2 and the input port 3 of multiplexer 2 by output port 5 and output port 6 correspondence after two-way modulation signal is carried out up-conversion by two-band transceiver 3 respectively; Two paths of signals after up-conversion is carried out filtering and is emitted to opposite end through dual-band antenna 1 after closing road by multiplexer 2.
Wherein, modulator-demodulator 4 comprises modulator 6, filtering and amplifying circuit 7, along separate routes exports 8, demodulator 9 and binary channels automatic growth control 10, and described modulator 6 to be exported to the input port 1 of filtering and amplifying circuit 7 by output port 2 after being modulated by the signal after the multiple connection received; Modulation signal carries out amplifying and being exported to the input port 1 exporting 8 along separate routes after filtering by output port 2 by filtering and amplifying circuit 7; Exported to input port 1 and the input port 2 of two-band transceiver 3 respectively by output port 2 and output port 3 after filtered signal is divided into two-way by output 8 along separate routes; The input port 3 of binary channels automatic growth control 10 and input port 4 receive the signal after the output port 3 of two-band transceiver 3 and the down-conversion of output port 4 output respectively, are exported to input port 2 and the input port 3 of demodulator 9 after this two paths of signals is carried out automatic growth control after obtaining the intermediate-freuqncy signal of two-way constant amplitude by output port 1 and output port 2 respectively; Exported to the input port 3 of baseband processing unit 5 by output port 1 after the two-way intermediate-freuqncy signal received is carried out diversity merging and coherent demodulation by demodulator 9.
Wherein, multiplexer 2 comprises that low-frequency range sends out filter 11, high band sends out filter 12, low-frequency range receives filter 13, high band receives filter 14 and combiner device 15; The input port 1 that low-frequency range sends out filter 11 receives the input port 1 being exported to combiner device 15 after up-conversion Hou mono-road signal carries out Choose filtering by output port 2; Exported to the input port 2 of combiner device 15 by output port 2 after another road signal after the input port 2 that high band sends out filter 12 receives up-conversion carries out Choose filtering; By the discrepancy port one going out inbound port 5 and export to dual-band antenna 1 after the two-way filtering signal received merges by combiner device 15; The inbound port 5 that goes out of combiner device 15 receives the wireless signal that dual-band antenna 1 sends, wireless signal is divided into identical two-way, one road signal exports by output port 3 input port 2 that low-frequency range receives filter 13 to, and another road signal exports by output port 4 input port 2 that high band receives filter 14 to; Exported to the input port 7 of two-band transceiver 3 by output port 1 after the signal received is carried out Choose filtering by low-frequency range receipts filter 13; Exported to the input port 8 of two-band transceiver 3 by output port 1 after the signal received is carried out Choose filtering by high band receipts filter 14.
The present invention compares background technology tool and has the following advantages:
1, the present invention adopts based on big-difference time delay power spectrum diversity receiving technology, the constant-parameter channel at the high elevation angle under not being only applicable to line of sight conditions, good diversity can be realized by big-difference time delay power spectrum channel in low elevation angle earth-space communication process, thus reduce that two footpaths of causing due to ground return are flat declines, realize the high-quality transmission of earth-space communication, thus the earth-space communication under the condition of the low elevation angle can well be adapted to.
2, the present invention adopts across frequency band broadband antenna designing technique, realizes omnidirectional antenna, the directed parabolic antenna of crossing over C, X frequency range, thus reduces equipment complexity, reduce equipment volume weight, be beneficial to the installation at aircraft platforms.
3, the present invention adopts the waveform of high spectral efficiency to combine with error correction coding, realizes the approximate permanent envelope of signal waveform, meets Large Copacity low threshold transmission requirement, effectively can improve efficiency power amplifier, reduces equipment power dissipation.
Accompanying drawing explanation
Fig. 1 is the present invention's electricity functional-block diagram;
Fig. 2 is the electrical schematic diagram of modulator-demodulator embodiment of the present invention;
Fig. 3 is the electrical schematic diagram of multiplexer of the present invention.
Embodiment
The working frequency range of the embodiment of the present invention is C frequency range and X frequency range, is described in further details the present invention below in conjunction with accompanying drawing.
Referring to figs. 1 through Fig. 3, the present invention by dual-band antenna 1, multiplexer 2, two-band transceiver 3, modulator-demodulator 4, composition such as baseband processing unit 5 grade.Fig. 1 is electric functional-block diagram of the present invention, and embodiment presses Fig. 1 connection line.
The effect of modulator-demodulator 4 of the present invention is that the baseband signal provided by baseband processing unit carries out error correction coding, modulation, recovers base-band information to the intermediate-freuqncy signal diversity merging received, demodulation.Fig. 2 is the electrical schematic diagram of modulator-demodulator embodiment of the present invention, and it is made up of modulator 6, filtering and amplifying circuit 7, along separate routes output 8, demodulator 9 and binary channels automatic growth control 10; Wherein the baseband signal that baseband processing unit 5 produces is modulated by modulator 6; Modulation signal is carried out amplification filtering by filtering and amplifying circuit 7; Export 8 pairs of modulation signals along separate routes and carry out shunt, export 2 road modulation signals and carry out upconversion process to two-band transceiver 3; The output signal of two-band transceiver 3 is carried out automatic growth control by binary channels automatic growth control 10, and export two-way constant amplitude signal to demodulator 9, the diversity that demodulator 9 completes Received signal strength merges and coherent demodulation.
The effect of multiplexer 2 of the present invention is carried out by the different frequency signals launched, receive synthesizing, along separate routes, thus transmission while carrying out the Frequency Division Duplexing (FDD) of multiple frequency range and diversity signal.Fig. 3 is the electrical schematic diagram of multiplexer of the present invention, and it comprises, and C frequency range sends out filter 11, X frequency range sends out filter 12, C frequency range receives filter 13, X frequency range receives filter 14 and combiner device 15; It is carry out C frequency range, the filtering of X frequency range respectively to transmitting that C frequency range sends out the effect that filter 11 and X frequency range send out filter 12, C frequency range, the filtering of X frequency range are carried out in the effect that C frequency range receives filter 13 and X frequency range receipts filter 14 to received signal respectively, and the effect of combiner device 15 is connected with dual-band antenna 1 to close road or shunt to the different frequency range signal of launch and accept.
The concise and to the point operation principle of the present invention is as follows:
Receiving terminal: dual-band antenna 1 sends the wireless signal received to multiplexer 2, multiplexer 2 isolates the Received signal strength of different frequency range by the receipts filter of different frequency range, give two-band transceiver 3 respectively, the conversion of Received signal strength frequency is completed in two-band transceiver 3, modulator-demodulator 4 is given by the signal after frequency conversion, the diversity completing two-band signal in modulator-demodulator merges and coherent demodulation, recover base-band information and give baseband processing unit 5, the auxiliary subdivision completing Received signal strength in baseband processing unit 5 connects, the functions such as interface conversion, the information recovering the other side's transmission is exported by external interface A,
Transmitting terminal: baseband processing unit 5 receives local information to be sent by external interface A, modulator-demodulator 4 is given after completing interface conversion, auxiliary multiple connection, two-band transceiver 3 is given respectively after completing coding, modulation, multiplexer 2 is given complete the frequency spectrum shift of modulation signal in two-band transceiver after, through being launched by dual-band antenna 1 behind multiplexer 2 filtering, conjunction road, complete the transmitting procedure of earth-space communication.
Claims (3)
1. one kind low elevation angle earth-space communication device, comprise dual-band antenna (1), two-band transceiver (3) and baseband processing unit (5), it is characterized in that: also comprise multiplexer (2) and modulator-demodulator (4); Export the discrepancy port one of multiplexer (2) to through port one of coming in and going out after described dual-band antenna (1) receives external wireless signals; Multiplexer (2) wireless signal received is isolated different frequency range obtain two-way filtering signal after by output port 4 and output port 5 respectively correspondence export input port 7 and the input port 8 of two-band transceiver (3) to; Exported to input port 5 and the input port 6 of modulator-demodulator (4) by output port 3 and output port 4 correspondence after this two-way filtering signal is carried out down-conversion by two-band transceiver (3) respectively; Two paths of signals after down-conversion is carried out diversity merging and coherent demodulation by modulator-demodulator (4), is exported to the input port 3 of baseband processing unit (5) after recovering base-band information by output port 2; Exported by discrepancy port one after base-band information is carried out auxiliary tap and interface conversion by baseband processing unit (5);
The discrepancy port one of baseband processing unit (5) receives local information to be sent, is exported to the input port 1 of modulator-demodulator (4) after information to be sent for this locality is carried out auxiliary multiple connection and interface conversion by output port 2; Modulator-demodulator (4) signal after multiple connection is carried out coding and after forming the different modulation signal of two-way after modulation treatment by output port 3 and output port 4 respectively correspondence export input port 1 and the input port 2 of two-band transceiver (3) to; Exported to input port 2 and the input port 3 of multiplexer (2) by output port 5 and output port 6 correspondence after two-way modulation signal is carried out up-conversion by two-band transceiver (3) respectively; Two paths of signals after up-conversion is carried out filtering and is emitted to opposite end through dual-band antenna (1) after closing road by multiplexer (2).
2. one according to claim 1 low elevation angle earth-space communication device, it is characterized in that: described modulator-demodulator (4) comprises modulator (6), filtering and amplifying circuit (7), along separate routes exports (8), demodulator (9) and binary channels automatic growth control (10), described modulator (6) to be exported to the input port 1 of filtering and amplifying circuit (7) by output port 2 after being modulated by the signal after the multiple connection received; Modulation signal carries out amplifying and being exported to the input port 1 exporting (8) along separate routes after filtering by output port 2 by filtering and amplifying circuit (7); Exported to input port 1 and the input port 2 of two-band transceiver (3) respectively by output port 2 and output port 3 after filtered signal is divided into two-way by output (8) along separate routes; The input port 3 of binary channels automatic growth control (10) and input port 4 receive the signal after the output port 3 of two-band transceiver (3) and the down-conversion of output port 4 output respectively, are exported to input port 2 and the input port 3 of demodulator (9) after this two paths of signals is carried out automatic growth control after obtaining the intermediate-freuqncy signal of two-way constant amplitude by output port 1 and output port 2 respectively; Exported to the input port 3 of baseband processing unit (5) by output port 1 after the two-way intermediate-freuqncy signal received is carried out diversity merging and coherent demodulation by demodulator (9).
3. one according to claim 1 low elevation angle earth-space communication device, is characterized in that: described multiplexer (2) comprises that low-frequency range sends out filter (11), high band sends out filter (12), low-frequency range receives filter (13), high band receives filter (14) and combiner device (15); The input port 1 that low-frequency range sends out filter (11) receives the input port 1 being exported to combiner device (15) after up-conversion Hou mono-road signal carries out Choose filtering by output port 2; Exported to the input port 2 of combiner device (15) by output port 2 after another road signal after the input port 2 that high band sends out filter (12) receives up-conversion carries out Choose filtering; By the discrepancy port one going out inbound port 5 and export to dual-band antenna (1) after the two-way filtering signal received merges by combiner device (15); The inbound port 5 that goes out of combiner device (15) receives the wireless signal that dual-band antenna (1) sends, wireless signal is divided into identical two-way, one road signal exports by output port 3 input port 2 that low-frequency range receives filter (13) to, and another road signal exports by output port 4 input port 2 that high band receives filter (14) to; Exported to the input port 7 of two-band transceiver (3) by output port 1 after the signal received is carried out Choose filtering by low-frequency range receipts filter (13); Exported to the input port 8 of two-band transceiver (3) by output port 1 after the signal received is carried out Choose filtering by high band receipts filter (14).
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Cited By (1)
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| CN107800460A (en) * | 2016-08-31 | 2018-03-13 | 中国电信股份有限公司 | For the radio frequency remote unit RRU and transmission method across frequency range carrier aggregation |
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