CN203551787U - Data transmission terminal used in Beidou satellite navigation system - Google Patents
Data transmission terminal used in Beidou satellite navigation system Download PDFInfo
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- CN203551787U CN203551787U CN201320700591.4U CN201320700591U CN203551787U CN 203551787 U CN203551787 U CN 203551787U CN 201320700591 U CN201320700591 U CN 201320700591U CN 203551787 U CN203551787 U CN 203551787U
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- output terminal
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- wave filter
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Abstract
The utility model discloses a data transmission terminal used in a Beidou satellite navigation system. The data transmission terminal comprises filters, an amplifier, an RF/IF down converter, an A/D converter, a frequency synthesizer, a reference oscillator, a power source data detector, a time clock counter, a navigation/receiver processor and a control display. According to the data transmission terminal used in the Beidou satellite navigation system, a received RF satellite signal is firstly filtered by a passive filter to reduce out-band radio frequency interference, then the radio frequency signal is subjected to down conversion into intermediate frequency, the IF signal sampling and digitalization is carried out using the A/D converter, a sample is sent to a signal processor, and in a DSP channel, code and carrier wave phase measurement and demodulation of navigation message data are completed. The data transmission terminal can effectively improve performances of the data transmission terminal and has a strong capability of receiving signals.
Description
Technical field
The utility model relates to a kind of data transmission terminal, relates in particular to a kind of data transmission terminal for Beidou satellite navigation system.
Background technology
Beidou satellite navigation system is China's global positioning satellite and communication system (BDS) of development voluntarily, Ji MeiGPSHe Russia GLONASS the 3rd ripe satellite navigation system afterwards, system is by vacant terminal, ground surface end and user side form, Beidou satellite navigation system be a kind of can be regularly and spatial intersection's pinpoint navigation system of range finding, it can provide continuous to global user, in real time, high accuracy three-dimensional position, three-dimensional velocity and put into practice information, utilize BDS technology to carry out navigator fix, no matter at military or civil area, there is extensive and important using value, the singularity of its applied environment has higher requirement to circuit performance, and the design of radio circuit is to realize high performance key, if radio frequency structure design is bad, make an uproar the limit sensitivity and signal to noise ratio (S/N ratio) and other technical indicator of data transmission terminal all can decline greatly, thereby affect the effect of received signal.
Utility model content
The purpose of this utility model provides a kind of data transmission terminal for Beidou satellite navigation system with regard to being in order to address the above problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
A kind of data transmission terminal for Beidou satellite navigation system, comprise wave filter, amplifier, RF/IF low-converter, A/D converter, frequency synthesizer, reference oscillator, power data detecting device, time clock counter, navigation/receiver processor and control display, described wave filter receiving satellite signal, the output terminal of described wave filter is connected with the input end of described amplifier, the output terminal of described amplifier is connected with the input end of described RF/IF low-converter, the input end of described A/D converter is connected with the output terminal of described RF/IF low-converter and the output terminal of described frequency synthesizer respectively, the input end of described frequency synthesizer is connected with the output terminal of described reference oscillator, the signal end of described A/D converter respectively with the signal end of described power data detecting device, the signal end of described time clock counter, the first signal end of described navigation/receiver processor and the first signal end of described controller are connected, the input end of described navigation/receiver processor is connected with the output terminal of described time clock counter with the output terminal of described power data detecting device respectively, the secondary signal end of described navigation/receiver processor is connected with the secondary signal end of described control display.
Particularly, described RF/IF low-converter comprises prefilter, the first wave filter, the second wave filter, the 3rd wave filter, PLL frequency synthesizer, 10MHz crystal resonator, AGC controller, converter and low noise amplifier, described prefilter input end input rf signal, the output terminal of described PLL frequency synthesizer respectively with the input end of described the first wave filter, the output terminal of described prefilter, the output terminal of described the first wave filter is connected with the input end of described the second wave filter, the output terminal of described 10MHz crystal resonator is connected with the input end of described PLL frequency synthesizer, the input end of described AGC controller is connected with the output terminal of described the second wave filter and the output terminal of described converter respectively, the output terminal of described AGC controller is connected with the input end of described the 3rd wave filter, described the 3rd output terminal of wave filter and the input end of described low noise amplifier are connected, the output terminal of described low noise amplifier is connected with the input end of described converter, described low noise amplifier output IF signal.
The beneficial effects of the utility model are:
A kind of data transmission terminal for Beidou satellite navigation system of the utility model is first used a passive filter filtering by the RF satellite-signal receiving, to reduce to be with outer Radio frequency interference (RFI), then radiofrequency signal is down-converted to intermediate frequency, with A/D converter to IF signal sampling and digitizing, sampling is delivered in digital signal processor, in DSP passage, complete code and carrier phase measurement, and the demodulation of navigation message data, use the utility model can effectively improve the performance of data transmission terminal, has the ability of stronger reception signal.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of a kind of data transmission terminal for Beidou satellite navigation system of the utility model;
Fig. 2 is the structured flowchart of the RF/IF low-converter of a kind of data transmission terminal for Beidou satellite navigation system of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, a kind of data transmission terminal for Beidou satellite navigation system of the utility model, comprise wave filter, amplifier, RF/IF low-converter, A/D converter, frequency synthesizer, reference oscillator, power data detecting device, time clock counter, navigation/receiver processor and control display, described wave filter receiving satellite signal, the output terminal of described wave filter is connected with the input end of described amplifier, the output terminal of described amplifier is connected with the input end of described RF/IF low-converter, the input end of described A/D converter is connected with the output terminal of described RF/IF low-converter and the output terminal of described frequency synthesizer respectively, the input end of described frequency synthesizer is connected with the output terminal of described reference oscillator, the signal end of described A/D converter respectively with the signal end of described power data detecting device, the signal end of described time clock counter, the first signal end of described navigation/receiver processor and the first signal end of described controller are connected, the input end of described navigation/receiver processor is connected with the output terminal of described time clock counter with the output terminal of described power data detecting device respectively, the secondary signal end of described navigation/receiver processor is connected with the secondary signal end of described control display.
As shown in Figure 2, described RF/IF low-converter comprises prefilter, the first wave filter, the second wave filter, the 3rd wave filter, PLL frequency synthesizer, 10MHz crystal resonator, AGC controller, converter and low noise amplifier, described prefilter input end input rf signal, the output terminal of described PLL frequency synthesizer respectively with the input end of described the first wave filter, the output terminal of described prefilter, the output terminal of described the first wave filter is connected with the input end of described the second wave filter, the output terminal of described 10MHz crystal resonator is connected with the input end of described PLL frequency synthesizer, the input end of described AGC controller is connected with the output terminal of described the second wave filter and the output terminal of described converter respectively, the output terminal of described AGC controller is connected with the input end of described the 3rd wave filter, described the 3rd output terminal of wave filter and the input end of described low noise amplifier are connected, the output terminal of described low noise amplifier is connected with the input end of described converter, described low noise amplifier output IF signal.
The principle of work of a kind of data transmission terminal for Beidou satellite navigation system of the utility model is as follows:
Notebook data transmission terminal is first used a passive filter filtering by the RF satellite-signal receiving, to reduce to be with outer Radio frequency interference (RFI), then radiofrequency signal is down-converted to intermediate frequency, with A/D converter to IF signal sampling and digitizing, sampling is delivered in digital signal processor, in DSP passage, complete code and carrier phase measurement, and the demodulation of navigation message data.The RF radiofrequency signal that RF/IF low-converter arrives antenna reception, the filtering of process and amplification, the sine wave signal producing with local oscillator carries out mixing, form intermediate-freuqncy signal, what the local oscillator of most of receiver adopted is the frequency synthesizer that accurate quartz oscillator is benchmark, intermediate-freuqncy signal is except step-down in carrier frequency, and the signal message of all modulation of RF signal is all transferred in intermediate-freuqncy signal.
Claims (2)
1. the data transmission terminal for Beidou satellite navigation system, it is characterized in that: comprise wave filter, amplifier, RF/IF low-converter, A/D converter, frequency synthesizer, reference oscillator, power data detecting device, time clock counter, navigation/receiver processor and control display, described wave filter receiving satellite signal, the output terminal of described wave filter is connected with the input end of described amplifier, the output terminal of described amplifier is connected with the input end of described RF/IF low-converter, the input end of described A/D converter is connected with the output terminal of described RF/IF low-converter and the output terminal of described frequency synthesizer respectively, the input end of described frequency synthesizer is connected with the output terminal of described reference oscillator, the signal end of described A/D converter respectively with the signal end of described power data detecting device, the signal end of described time clock counter, the first signal end of described navigation/receiver processor and the first signal end of described controller are connected, the input end of described navigation/receiver processor is connected with the output terminal of described time clock counter with the output terminal of described power data detecting device respectively, the secondary signal end of described navigation/receiver processor is connected with the secondary signal end of described control display.
2. a kind of data transmission terminal for Beidou satellite navigation system according to claim 1, it is characterized in that: described RF/IF low-converter comprises prefilter, the first wave filter, the second wave filter, the 3rd wave filter, PLL frequency synthesizer, 10MHz crystal resonator, AGC controller, converter and low noise amplifier, described prefilter input end input rf signal, the output terminal of described PLL frequency synthesizer respectively with the input end of described the first wave filter, the output terminal of described prefilter, the output terminal of described the first wave filter is connected with the input end of described the second wave filter, the output terminal of described 10MHz crystal resonator is connected with the input end of described PLL frequency synthesizer, the input end of described AGC controller is connected with the output terminal of described the second wave filter and the output terminal of described converter respectively, the output terminal of described AGC controller is connected with the input end of described the 3rd wave filter, described the 3rd output terminal of wave filter and the input end of described low noise amplifier are connected, the output terminal of described low noise amplifier is connected with the input end of described converter, described low noise amplifier output IF signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320700591.4U CN203551787U (en) | 2013-11-07 | 2013-11-07 | Data transmission terminal used in Beidou satellite navigation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320700591.4U CN203551787U (en) | 2013-11-07 | 2013-11-07 | Data transmission terminal used in Beidou satellite navigation system |
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| Publication Number | Publication Date |
|---|---|
| CN203551787U true CN203551787U (en) | 2014-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320700591.4U Expired - Lifetime CN203551787U (en) | 2013-11-07 | 2013-11-07 | Data transmission terminal used in Beidou satellite navigation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2013
- 2013-11-07 CN CN201320700591.4U patent/CN203551787U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |