CN204964766U - Big dipper RDSS radio frequency transceiving frequency conversion passageway module - Google Patents
Big dipper RDSS radio frequency transceiving frequency conversion passageway module Download PDFInfo
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- CN204964766U CN204964766U CN201520706373.0U CN201520706373U CN204964766U CN 204964766 U CN204964766 U CN 204964766U CN 201520706373 U CN201520706373 U CN 201520706373U CN 204964766 U CN204964766 U CN 204964766U
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Abstract
The utility model discloses a big dipper RDSS radio frequency transceiving frequency conversion passageway module belongs to the beiDou navigation satellite system communications field. A big dipper RDSS radio frequency transceiving frequency conversion passageway module includes radio frequency transceiving frequency conversion chip, the IF output end and an intermediate frequency input of radio frequency transceiving frequency conversion chip all link to each other with a IF filter, the signal input part of radio frequency transceiving frequency conversion chip connects power switching circuit's signal output part, the signal input part of radio frequency transceiving frequency conversion chip connects crystal oscillator's signal output part, the clock phase locked loop of radio frequency transceiving frequency conversion chip links to each other with the phase locked loop wave filter, radio frequency transceiving frequency conversion chip respectively with transmission phase locked loop wave filter, it links to each other to receive the phase locked loop wave filter, the SPI interface of radio frequency transceiving frequency conversion chip links to each other with the singlechip. The utility model discloses can free choice simulation intermediate frequency signal and digital intermediate frequency signal to can conveniently adjust clock output frequence, can use widely in big dipper terminal equipment such as big dipper subscriber computer, commander's machine.
Description
Technical field
The utility model belongs to the Beidou navigation communications field, particularly a kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module.
Background technology
Beidou satellite navigation system, be China implementing independent development capability, independent operating GPS (Global Position System).Beidou satellite navigation system by space segment, ground segment and user segment three part form, space segment comprises 5 satellites and 30 non-geo satellites, ground segment comprises several land stations such as master station, injection plant and monitoring station, and user segment comprises Big Dipper user terminal and the terminal with other satellite navigation system compatibilities.
Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module can be used in the Big Dipper terminal device such as Beidou subscriber machine, commander's machine, to receive through antenna element, low noise amplifier amplifies, filtered RDSS signal is given baseband signal part after carrying out down-converted and carried out digital processing, resolves, thus obtains useful information.But the transceiver channel cost of traditional discrete device composition is higher, integrated level is low, volume is excessive, cannot unrestricted choice analog if signal and digital medium-frequency signal.
Utility model content
The utility model is in order to overcome above-mentioned the deficiencies in the prior art, provide a kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module, the utility model provide a kind of with low cost, integrated level is high, volume is little, low in energy consumption, debug simple Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module, the Beidou navigation communications field can be widely used in.
For achieving the above object, the utility model have employed following technical measures:
A kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module, it is characterized in that: comprise the radio-frequency receiving-transmitting frequency conversion chip for receiving low noise amplifier output signal, one medium frequency output end of described radio-frequency receiving-transmitting frequency conversion chip is all connected with an intermediate-frequency filter with an IF input terminal, the signal input part of described radio-frequency receiving-transmitting frequency conversion chip connects the signal output part of power-switching circuit, the signal input part of described radio-frequency receiving-transmitting frequency conversion chip connects the signal output part of crystal oscillator, the clock phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip is connected with phase-locked loop filter, the transmission channel local oscillator phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip is connected with transmitting phase-locked loop filter, the receiving cable local oscillator phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip is connected with reception phase-locked loop filter, the SPI interface of described radio-frequency receiving-transmitting frequency conversion chip is connected with single-chip microcomputer, described radio-frequency receiving-transmitting frequency conversion chip model is BG7812EA,
The utility model can also be realized further by following technical measures.
Preferably, the input end of a described intermediate-frequency filter connects one end of inductance L 1, inductance L 2 respectively, and the other end of described inductance L 1, inductance L 2 connects a medium frequency output end of radio-frequency receiving-transmitting frequency conversion chip respectively; The output terminal of a described intermediate-frequency filter connects one end of inductance L 3, inductance L 4 respectively, and the other end of described inductance L 3, inductance L 4 connects an IF input terminal of radio-frequency receiving-transmitting frequency conversion chip respectively.
Preferably, described power-switching circuit comprises power conversion chip, and the model of described power conversion chip is LT17633; The pin 8 of described power conversion chip, pin 5 are all connected with the positive terminal of electric capacity C1, electric capacity C3 and+5V power supply, the negative pole end ground connection of described electric capacity C1, electric capacity C3; Pin 1, the pin 2 of described power conversion chip are all connected with the positive terminal of electric capacity C4 with electric capacity C2, the negative pole end ground connection of described electric capacity C2 and electric capacity C4, the pin 2 of described power conversion chip is connected electric capacity C5 with between pin 4, and the signal output part of described power conversion chip is connected with the signal input part of radio-frequency receiving-transmitting frequency conversion chip.
Preferably, described phase-locked loop filter comprises resistance R5, electric capacity C31, electric capacity C32; The clock phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip is connected with one end of resistance R5, electric capacity C31, and the other end of described resistance R5 connects one end, the other end of described electric capacity C32 and the equal ground connection of the other end of electric capacity C31 of electric capacity C32.
Further, described crystal oscillator comprises crystal oscillator, and the signal output part of described crystal oscillator connects one end of electric capacity C35, and the other end of described electric capacity C35 connects the reference frequency input end of radio-frequency receiving-transmitting frequency conversion chip.
Further, a described intermediate-frequency filter chip model is the sound surface band bandpass filter of TB0939A; The model of described single-chip microcomputer is ATtiny25V-10SU.
Further, described transmitting phase-locked loop filter comprises resistance R14, resistance R16, electric capacity C48, electric capacity C49, electric capacity C50; The pin 24 difference contact resistance R14 of described radio-frequency receiving-transmitting frequency conversion chip, one end of electric capacity C48, the other end of described resistance R14 connects one end of electric capacity C49, one end of resistance R16, the pin 25 of radio-frequency receiving-transmitting frequency conversion chip respectively, the other end of described electric capacity C49 and the equal ground connection of the other end of electric capacity C48, the other end of described resistance R166 connects one end of electric capacity C50, the other end ground connection of described electric capacity C50.
Further, described reception phase-locked loop filter comprises resistance R4, resistance R6, electric capacity C30, electric capacity C33, electric capacity C34; The pin 7 difference contact resistance R4 of described radio-frequency receiving-transmitting frequency conversion chip, one end of electric capacity C30, the other end of described resistance R4 connects one end of electric capacity C33, one end of resistance R6, the pin 9 of radio-frequency receiving-transmitting frequency conversion chip respectively, the other end of described resistance R6 connects one end of electric capacity C34, the equal ground connection of the other end of described electric capacity C30, electric capacity C33, electric capacity C34.
Further, one end of the pin 1 contact resistance R1 of described single-chip microcomputer, the other end of described resistance R1 connects power supply, the pin 8 of described single-chip microcomputer connects one end of electric capacity C6, resistance R2 respectively, the other end ground connection of described electric capacity C6, the other end of described resistance R2 connects power supply, and the pin 5 of described single-chip microcomputer, pin 6, pin 7, pin 2 are connected with the pin 22 of described radio-frequency receiving-transmitting frequency conversion chip, pin 21, pin 20, pin 19 respectively.
The beneficial effects of the utility model are:
1), the utility model by radio-frequency receiving-transmitting frequency conversion chip, an intermediate-frequency filter, power-switching circuit, phase-locked loop filter, crystal oscillator, launch phase-locked loop filter, receive phase-locked loop filter, single-chip microcomputer form.The utility model not only can unrestricted choice analog if signal and digital medium-frequency signal, and can adjust clock output frequency easily, can be widely used in the Big Dipper terminal device such as Beidou subscriber machine, commander's machine.
Be worth it is emphasized that: the utility model is only protected by above-mentioned physical unit and is connected the device or physical platform that the circuit between each physical unit forms, and does not relate to software section wherein.
2), described radio-frequency receiving-transmitting frequency conversion chip model is BG7812EA, have that integrated level is high, volume is little, low in energy consumption, easy to use, debug the features such as simple, can unrestricted choice analog intermediate frequency and digital intermediate frequency and conveniently adjust clock output frequency.
3) the intermediate-frequency filter chip model, in the utility model is the sound surface band bandpass filter of TB0939A, and the model of the power conversion chip in power-switching circuit is LT17633, and the model of described single-chip microcomputer is ATtiny25V-10SU.The parts of above-mentioned multiple specific model are worked in coordination, and achieve optimal design of the present utility model.
Accompanying drawing explanation
Fig. 1 is circuit composition frame chart of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
1-radio-frequency receiving-transmitting frequency conversion chip 2-intermediate-frequency filter
3-power-switching circuit, 4-phase-locked loop filter
5-crystal oscillator, 6-transmitting phase-locked loop filter
7-receive phase-locked loop filter 8-single-chip microcomputer
31-power conversion chip, 51-crystal oscillator
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, a kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module, comprise the radio-frequency receiving-transmitting frequency conversion chip 1 for receiving low noise amplifier output signal, one medium frequency output end of described radio-frequency receiving-transmitting frequency conversion chip 1 is all connected with an intermediate-frequency filter 2 with an IF input terminal, the signal input part of described radio-frequency receiving-transmitting frequency conversion chip 1 connects the signal output part of power-switching circuit 3, the reference frequency input end of described radio-frequency receiving-transmitting frequency conversion chip 1 connects the signal output part of crystal oscillator 5, the clock phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip 1 is connected with phase-locked loop filter 4, the transmission channel local oscillator phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip 1 is connected with transmitting phase-locked loop filter 6, the receiving cable local oscillator phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip 1 is connected with reception phase-locked loop filter 7, the SPI interface of described radio-frequency receiving-transmitting frequency conversion chip 1 is connected with single-chip microcomputer 8.
As shown in Figure 2, described radio-frequency receiving-transmitting frequency conversion chip 1 model is BG7812EA chip, the pin 3 of described radio-frequency receiving-transmitting frequency conversion chip 1 is connected with one end of resistance R3, the other end of described resistance R3 is connected with electric capacity C27, electric capacity C28 one end, the other end ground connection of described electric capacity C27, the other end of described electric capacity C28 is connected with the output signal end of outside low noise amplifier, pin 11 and the electric capacity C39 of described radio-frequency receiving-transmitting frequency conversion chip 1, inductance L 5, one end of electric capacity C38 is connected, the other end of described electric capacity C39, the other end of inductance L 5 connects+3.3V power supply respectively, described electric capacity C38 is connected with TXIN signal, the pin 13 of described radio-frequency receiving-transmitting frequency conversion chip 1 is connected with resistance R15 one end, the other end of described resistance R15 connects outside TEN and launches enable signal end, the pin 16 of described radio-frequency receiving-transmitting frequency conversion chip 1 connects outside BPSK modulation signal, the pin 32 of described radio-frequency receiving-transmitting frequency conversion chip 1, pin 33 connects base-band digital intermediate-frequency section respectively, the pin 35 of described radio-frequency receiving-transmitting frequency conversion chip 1, pin 37 connects one end of electric capacity C26 respectively, one end of electric capacity C17, the other end of described electric capacity C26, the equal ground connection of the other end of electric capacity C17, the pin 40 of described radio-frequency receiving-transmitting frequency conversion chip 1 connects baseband portion analog intermediate frequency input port, and the power input of the pin 1 of described radio-frequency receiving-transmitting frequency conversion chip 1, pin 2, pin 5, pin 6, pin 8, pin 10, pin 12, pin 14, pin 17, pin 18, pin 23, pin 26, pin 28, pin 31, pin 34, pin 36, pin 38, pin 39, pin 43, pin 44 is+3.3V power supply.
As shown in Figure 2, a described intermediate-frequency filter 2 chip model is the sound surface band bandpass filter of TB0939A; The IN pin of a described intermediate-frequency filter 2 connects one end of inductance L 1, inductance L 2 respectively, and the other end of described inductance L 1, inductance L 2 connects a medium frequency output end of radio-frequency receiving-transmitting frequency conversion chip 1 respectively; The OUT pin of a described intermediate-frequency filter 2 connects one end of inductance L 3, inductance L 4 respectively, and the other end of described inductance L 3, inductance L 4 connects an IF input terminal of radio-frequency receiving-transmitting frequency conversion chip 1 respectively; Other pin ground connection of a described intermediate-frequency filter 2.
As shown in Figure 2, described power-switching circuit 3 comprises power conversion chip 31, and the model of described power conversion chip 31 is LT17633; The pin 8 of described power conversion chip 31, pin 5 are all connected with the positive terminal of electric capacity C1, electric capacity C3 and+5V power supply, the negative pole end ground connection of described electric capacity C1, electric capacity C3; Pin 1, the pin 2 of described power conversion chip 31 are all connected with the positive terminal of electric capacity C4 with electric capacity C2, the negative pole end ground connection of described electric capacity C2 and electric capacity C4, the pin 2 of described power conversion chip 31 is connected electric capacity C5 with between pin 4, and the signal output part of described power conversion chip 31 is connected with the signal input part of radio-frequency receiving-transmitting frequency conversion chip 1.
As shown in Figure 2, described phase-locked loop filter 4 comprises resistance R5, electric capacity C31, electric capacity C32; The clock phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip 1 is connected with one end of resistance R5, electric capacity C31, and the other end of described resistance R5 connects one end, the other end of described electric capacity C32 and the equal ground connection of the other end of electric capacity C31 of electric capacity C32.
As shown in Figure 2, described crystal oscillator 5 comprises crystal oscillator 51, and the signal output part of described crystal oscillator 51 connects one end of electric capacity C35, and the other end of described electric capacity C35 connects the reference frequency input end of radio-frequency receiving-transmitting frequency conversion chip 1.
As shown in Figure 2, described transmitting phase-locked loop filter 6 comprises resistance R14, resistance R16, electric capacity C48, electric capacity C49, electric capacity C50; The pin 24 difference contact resistance R14 of described radio-frequency receiving-transmitting frequency conversion chip 1, one end of electric capacity C48, the other end of described resistance R14 connects one end of electric capacity C49, one end of resistance R16, the pin 25 of radio-frequency receiving-transmitting frequency conversion chip 1 respectively, the other end of described electric capacity C49 and the equal ground connection of the other end of electric capacity C48, the other end of described resistance R166 connects one end of electric capacity C50, the other end ground connection of described electric capacity C50.
As shown in Figure 2, described reception phase-locked loop filter 7 comprises resistance R4, resistance R6, electric capacity C30, electric capacity C33, electric capacity C34; The pin 7 difference contact resistance R4 of described radio-frequency receiving-transmitting frequency conversion chip 1, one end of electric capacity C30, the other end of described resistance R4 connects one end of electric capacity C33, one end of resistance R6, the pin 9 of radio-frequency receiving-transmitting frequency conversion chip 1 respectively, the other end of described resistance R6 connects one end of electric capacity C34, the equal ground connection of the other end of described electric capacity C30, electric capacity C33, electric capacity C34.
As shown in Figure 2, the model of described single-chip microcomputer 8 is ATtiny25V-10SU, one end of the pin 1 contact resistance R1 of described single-chip microcomputer 8, the other end of described resistance R1 connects power supply, the pin 8 of described single-chip microcomputer 8 connects one end of electric capacity C6, resistance R2 respectively, the other end ground connection of described electric capacity C6, the other end of described resistance R2 connects power supply, and the pin 5 of described single-chip microcomputer 8, pin 6, pin 7, pin 2 are connected with the pin 22 of described radio-frequency receiving-transmitting frequency conversion chip 1, pin 21, pin 20, pin 19 respectively.
Claims (9)
1. a Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module, it is characterized in that: comprise the radio-frequency receiving-transmitting frequency conversion chip (1) for receiving low noise amplifier output signal, one medium frequency output end of described radio-frequency receiving-transmitting frequency conversion chip (1) is all connected with an intermediate-frequency filter (2) with an IF input terminal, the signal input part of described radio-frequency receiving-transmitting frequency conversion chip (1) connects the signal output part of power-switching circuit (3), the signal input part of described radio-frequency receiving-transmitting frequency conversion chip (1) connects the signal output part of crystal oscillator (5), the clock phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip (1) is connected with phase-locked loop filter (4), the transmission channel local oscillator phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip (1) is connected with transmitting phase-locked loop filter (6), the receiving cable local oscillator phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip (1) is connected with reception phase-locked loop filter (7), the SPI interface of described radio-frequency receiving-transmitting frequency conversion chip (1) is connected with single-chip microcomputer (8), described radio-frequency receiving-transmitting frequency conversion chip (1) model is BG7812EA.
2. a kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module as claimed in claim 1, it is characterized in that: the input end of a described intermediate-frequency filter (2) connects one end of inductance L 1, inductance L 2 respectively, and the other end of described inductance L 1, inductance L 2 connects a medium frequency output end of radio-frequency receiving-transmitting frequency conversion chip (1) respectively; The output terminal of a described intermediate-frequency filter (2) connects one end of inductance L 3, inductance L 4 respectively, and the other end of described inductance L 3, inductance L 4 connects an IF input terminal of radio-frequency receiving-transmitting frequency conversion chip (1) respectively.
3. a kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module as claimed in claim 1, it is characterized in that: described power-switching circuit (3) comprises power conversion chip (31), the model of described power conversion chip (31) is LT17633; The pin 8 of described power conversion chip (31), pin 5 are all connected with the positive terminal of electric capacity C1, electric capacity C3 and+5V power supply, the negative pole end ground connection of described electric capacity C1, electric capacity C3; Pin 1, the pin 2 of described power conversion chip (31) are all connected with the positive terminal of electric capacity C4 with electric capacity C2, the negative pole end ground connection of described electric capacity C2 and electric capacity C4, the pin 2 of described power conversion chip (31) is connected electric capacity C5 with between pin 4, and the signal output part of described power conversion chip (31) is connected with the signal input part of radio-frequency receiving-transmitting frequency conversion chip (1).
4. a kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module as claimed in claim 1, is characterized in that: described phase-locked loop filter (4) comprises resistance R5, electric capacity C31, electric capacity C32; The clock phase-locked loop of described radio-frequency receiving-transmitting frequency conversion chip (1) is connected with one end of resistance R5, electric capacity C31, and the other end of described resistance R5 connects one end, the other end of described electric capacity C32 and the equal ground connection of the other end of electric capacity C31 of electric capacity C32.
5. a kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module as claimed in claim 1, it is characterized in that: described crystal oscillator (5) comprises crystal oscillator (51), the signal output part of described crystal oscillator (51) connects one end of electric capacity C35, and the other end of described electric capacity C35 connects the reference frequency input end of radio-frequency receiving-transmitting frequency conversion chip (1).
6. a kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module as claimed in claim 2, is characterized in that: a described intermediate-frequency filter (2) chip model is the sound surface band bandpass filter of TB0939A; The model of described single-chip microcomputer (8) is ATtiny25V-10SU.
7. a kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module as claimed in claim 1, is characterized in that: described transmitting phase-locked loop filter (6) comprises resistance R14, resistance R16, electric capacity C48, electric capacity C49, electric capacity C50; The pin 24 difference contact resistance R14 of described radio-frequency receiving-transmitting frequency conversion chip (1), one end of electric capacity C48, the other end of described resistance R14 connects one end of electric capacity C49, one end of resistance R16, the pin 25 of radio-frequency receiving-transmitting frequency conversion chip (1) respectively, the other end of described electric capacity C49 and the equal ground connection of the other end of electric capacity C48, the other end of described resistance R166 connects one end of electric capacity C50, the other end ground connection of described electric capacity C50.
8. a kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module as claimed in claim 1, is characterized in that: described reception phase-locked loop filter (7) comprises resistance R4, resistance R6, electric capacity C30, electric capacity C33, electric capacity C34; The pin 7 difference contact resistance R4 of described radio-frequency receiving-transmitting frequency conversion chip (1), one end of electric capacity C30, the other end of described resistance R4 connects one end of electric capacity C33, one end of resistance R6, the pin 9 of radio-frequency receiving-transmitting frequency conversion chip (1) respectively, the other end of described resistance R6 connects one end of electric capacity C34, the equal ground connection of the other end of described electric capacity C30, electric capacity C33, electric capacity C34.
9. a kind of Big Dipper RDSS radio-frequency receiving-transmitting frequency conversion channel module as claimed in claim 6, it is characterized in that: one end of the pin 1 contact resistance R1 of described single-chip microcomputer (8), the other end of described resistance R1 connects power supply, the pin 8 of described single-chip microcomputer (8) connects electric capacity C6 respectively, one end of resistance R2, the other end ground connection of described electric capacity C6, the other end of described resistance R2 connects power supply, the pin 5 of described single-chip microcomputer (8), pin 6, pin 7, pin 2 respectively with the pin 22 of described radio-frequency receiving-transmitting frequency conversion chip (1), pin 21, pin 20, pin 19 is connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520706373.0U CN204964766U (en) | 2015-09-11 | 2015-09-11 | Big dipper RDSS radio frequency transceiving frequency conversion passageway module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520706373.0U CN204964766U (en) | 2015-09-11 | 2015-09-11 | Big dipper RDSS radio frequency transceiving frequency conversion passageway module |
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| CN204964766U true CN204964766U (en) | 2016-01-13 |
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| CN201520706373.0U Expired - Fee Related CN204964766U (en) | 2015-09-11 | 2015-09-11 | Big dipper RDSS radio frequency transceiving frequency conversion passageway module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107942351A (en) * | 2017-11-15 | 2018-04-20 | 广西师范学院 | A kind of Big Dipper RDSS radio frequency transmissions detection devices |
| CN108072882A (en) * | 2017-11-28 | 2018-05-25 | 天津七六四通信导航技术有限公司 | A kind of Beidou navigation jamproof system and its signal receiving device |
-
2015
- 2015-09-11 CN CN201520706373.0U patent/CN204964766U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107942351A (en) * | 2017-11-15 | 2018-04-20 | 广西师范学院 | A kind of Big Dipper RDSS radio frequency transmissions detection devices |
| CN108072882A (en) * | 2017-11-28 | 2018-05-25 | 天津七六四通信导航技术有限公司 | A kind of Beidou navigation jamproof system and its signal receiving device |
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