CN201540463U - Big dipper-1 passive positioning time service terminal - Google Patents
Big dipper-1 passive positioning time service terminal Download PDFInfo
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- CN201540463U CN201540463U CN2009203147534U CN200920314753U CN201540463U CN 201540463 U CN201540463 U CN 201540463U CN 2009203147534 U CN2009203147534 U CN 2009203147534U CN 200920314753 U CN200920314753 U CN 200920314753U CN 201540463 U CN201540463 U CN 201540463U
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Abstract
The utility model discloses a big dipper-1 passive positioning time service terminal. The utility model includes an A/D converter, a digital down converter, an I route correlator, an I route PN code creater, a Q route correlator, a Q route PN code creater, an I route demodulator, a Q route demodulator, a time difference information extraction module, a carrier recovery module, a pulse per second forming device, a time difference measuring module, a navigation message generating module and a time delay correcting module. By receiving satellite signal from the Big dipper-1, the utility model can decode the broadcast massage for obtaining satellite position, speed and other information, combined with user position and measurement signal propagation delay, the required accurate stable pulse per second can be obtained, thereby realizing synchronization of local time and Big dipper-1 time.
Description
Technical field
The utility model relates to a passive location time service of a kind of Big Dipper terminal.
Background technology
Accurate regularly having extensively and important use with industrial circle such as communication, electric power, control and national defence field.At present, the timing means of using in these fields mainly is a worldwide navigation positioning system of utilizing the U.S., be that GPS finishes timing function, refer to that specifically the GPS receiver obtains the clock correction of local zone time and UTC standard time by certain mode, adjusts local clock then the time difference is controlled in the definite accuracy.
But utilize the gps satellite navigational system to finish time service and have following problem:
1, because gps system is controlled by U.S. Department of Defense, and this method independence is poor, brings some labile factors, for example deliberately reduce GPS service precision, shutdown signal increases random code, sends radio interference etc.
2, U.S. government has " shadow shield technology " to gps system, and at war or other particular times, when for example disaster taking place, U.S. government might close the GPS service to China.
3, technically, the first, the time signal long-time stability that the GPS receiver provides are good, but short-term stability is poor, and the second, the gps signal poor anti jamming capability, the 3rd, in satellite test or debugging, gps clock may saltus step.
Summary of the invention
In order to solve the above-mentioned technical matters that present gps satellite navigational system time service exists, the utility model provides that a kind of volume is little, time service precision is high, passive time service terminal of the reliable Big Dipper.
The utility model is to adopt following proposal to realize: comprise the A/D analog to digital converter, digital down converter, I road correlator, I road PN code generator, Q road correlator, Q road PN code generator, I road detuner, Q road detuner, the time difference information extraction module, carrier recovery block, pulse per second (PPS) forms device, the time difference measurement module, navigation message generation module and time delay correcting module, described A/D analog to digital converter links to each other with digital down converter, digital down converter respectively with I road correlator, Q road correlator links to each other, I road PN code generator respectively with I road correlator, the time difference information extraction module links to each other, the output of I road correlator connects I road detuner respectively, carrier recovery block, the output of carrier recovery block connects digital down converter, the output of time difference information extraction module connects the time difference measurement module, Q road correlator respectively with Q road PN code generator, Q road detuner links to each other, the output of I road detuner and Q road detuner connects the navigation message generation module, and the output of time delay correcting module connects pulse per second (PPS) and forms device.
In an above-mentioned passive location time service of the Big Dipper terminal, described pulse per second (PPS) forms device and comprises that pulse per second (PPS) produces counter, crystal oscillator, counter, pulse per second (PPS) generation time modified value circuit, pulse per second (PPS) produces counter and links to each other with crystal oscillator, counter, pulse per second (PPS) generation time modified value circuit, frame synchronizing signal respectively, the input of counter connects the modified value signal and writes, and the output of counter connects pulse per second (PPS) generation time modified value circuit.
The utility model is owing to adopt technique scheme, and it possesses following advantage:
1) reliable and stable, the pulse per second (PPS) precision height of terminal operating.
2) under the situation of the of short duration losing lock of satellite-signal, continue to keep stable, high-precision pulse per second (PPS) output.
3) under the situation that does not have the exterior coordinate input, the passive location software module of the Big Dipper can be dissolved in the middle of the time service function, be realized passive time service.
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the structural drawing that pulse per second (PPS) forms device in the utility model.
Embodiment
Referring to Fig. 1, the utility model comprises that A/D analog to digital converter, digital down converter, I road correlator, I road PN code generator, Q road correlator, Q road PN code generator, I road detuner, Q road detuner, time difference information extraction module, carrier recovery block, pulse per second (PPS) form device, time difference measurement module, navigation message generation module and time delay correcting module.A/D analog to digital converter major function be the intermediate-freuqncy signal of the 12.24M of self simulation radio-frequency module in the future after filtering is amplified, sample quantization is transformed to the digital signal of 8bit and delivers in the digital down converter; The digital down converter major function is signal to be divided into I, Q branch road in the digital intermediate frequency territory; I road correlator is realized the related operation of I tributary signal, and I road PN sign indicating number generator produces I road spreading code, and both finish the despreading function on I road jointly; Q road correlator is realized the related operation of Q tributary signal, and Q road PN sign indicating number generator produces Q road spreading code, and both finish the despreading function on Q road jointly; I road detuner is finished the demodulation of I road signal, and Q road detuner is finished the demodulation of Q road signal; The time difference information extraction module is finished the formation of satellite beams difference time of arrival key parameter; Carrier recovery block is finished the generation of carrier signal, and realizes the local carrier wave that produces and the frequency and the phase-locking of reception carrier by phase-locked loop; The time difference measurement module realizes utilizing relevant time-difference parameter and related algorithm to carry out time difference measurement; The navigation message generation module carries out the extraction and the generation of navigation message according to the Big Dipper downlink data upon handover that obtains; The time delay correcting module is realized the counter initial value of pulse per second (PPS) formation device is dynamically revised; Pulse per second (PPS) forms device and produces the 1pps pulse per second (PPS).
Message processing flow is: after filtering was amplified, the digital signal that is transformed to 8bit by A/D was delivered among the FPGA from the intermediate-freuqncy signal of the 12.24M of channel module.Finish the Digital Down Convert of signal among the DDC in FPGA, and be divided into I, the Q branch road, I branch road information generates by correlator and I road PN sign indicating number and finishes the despreading of I road, send into carrier recovery block and finish the carrier wave recovery, send into demodulation module and finish demodulation, despread signal inserts the time difference information extraction and finishes, and in DSP, finish time difference measurement, Q branch road information generates by correlator and Q road PN sign indicating number and finishes the despreading of Q road, send into demodulation module and finish demodulation, I, the merging of Q two paths of signals is input to the navigation message generation module and finishes the navigation message generation, pulse per second (PPS) forms and produces pulse per second (PPS) output, and pulse per second (PPS) counter time delay is rested and reorganized pulse per second (PPS) formation is revised among the DSP.
Referring to Fig. 2, described pulse per second (PPS) forms device and comprises that pulse per second (PPS) produces counter, crystal oscillator, counter, pulse per second (PPS) generation time modified value circuit, pulse per second (PPS) produces counter and links to each other with crystal oscillator, counter, pulse per second (PPS) generation time modified value circuit, frame synchronizing signal respectively, the input of counter connects the modified value signal and writes, and the output of counter connects pulse per second (PPS) generation time modified value circuit.The crystal oscillator clocking is come when modified value signal write signal, and putting pulse per second (PPS) generation time modified value circuit is 1, the enabling counting device; If Counter Value is greater than 32ms, putting pulse per second (PPS) generation time modified value circuit is 0; The frame-synchronizing impulse rising edge arrives, and detects whether pulse per second (PPS) generation time modified value circuit is 1, if 1, then modified value is forced to implant pulse per second (PPS) and produce counter; If pulse per second (PPS) generation time modified value circuit is 0, then pulse per second (PPS) produces counter under crystal oscillator drives, and continues counting.If the n-1 LOF, the ' frame arrives as scheduled, revises the data life period this moment and surpasses 31.25ms, and it is invalid then to be judged to, and is moved automatically by counter, obtains pulse per second (PPS), has avoided missing pulse thus; If the ' LOF, when the n+1 frame arrived, the correction data that the ' frame produces lost efficacy, and do not revise counter this moment, avoided multipulse phenomenon thus.
Claims (2)
1. a passive location time service of Big Dipper terminal, it is characterized in that: comprise the A/D analog to digital converter, digital down converter, I road correlator, I road PN code generator, Q road correlator, Q road PN code generator, I road detuner, Q road detuner, the time difference information extraction module, carrier recovery block, pulse per second (PPS) forms device, the time difference measurement module, navigation message generation module and time delay correcting module, described A/D analog to digital converter links to each other with digital down converter, digital down converter respectively with I road correlator, Q road correlator links to each other, I road PN code generator respectively with I road correlator, the time difference information extraction module links to each other, the output of I road correlator connects I road detuner respectively, carrier recovery block, the output of carrier recovery block connects digital down converter, the output of time difference information extraction module connects the time difference measurement module, Q road correlator respectively with Q road PN code generator, Q road detuner links to each other, the output of I road detuner and Q road detuner connects the navigation message generation module, and the output of time delay correcting module connects pulse per second (PPS) and forms device.
2. a passive location time service of the Big Dipper according to claim 1 terminal, it is characterized in that: described pulse per second (PPS) forms device and comprises that pulse per second (PPS) produces counter, crystal oscillator, counter, pulse per second (PPS) generation time modified value circuit, pulse per second (PPS) produces counter and links to each other with crystal oscillator, counter, pulse per second (PPS) generation time modified value circuit, frame synchronizing signal respectively, the input of counter connects the modified value signal and writes, and the output of counter connects pulse per second (PPS) generation time modified value circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203147534U CN201540463U (en) | 2009-11-13 | 2009-11-13 | Big dipper-1 passive positioning time service terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203147534U CN201540463U (en) | 2009-11-13 | 2009-11-13 | Big dipper-1 passive positioning time service terminal |
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| CN201540463U true CN201540463U (en) | 2010-08-04 |
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| CN2009203147534U Expired - Fee Related CN201540463U (en) | 2009-11-13 | 2009-11-13 | Big dipper-1 passive positioning time service terminal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033489A (en) * | 2010-12-16 | 2011-04-27 | 成都天奥电子股份有限公司 | Multifunctional Beidou second generation satellite time service watch and realizing method thereof |
| CN102109814A (en) * | 2010-12-31 | 2011-06-29 | 北京昆腾微电子有限公司 | Device and method for acquiring electric wave time signals |
| CN103033828A (en) * | 2012-12-14 | 2013-04-10 | 北京东方联星科技有限公司 | High-sensitivity compass-assisted time servicing device, time service receiver and time service method |
-
2009
- 2009-11-13 CN CN2009203147534U patent/CN201540463U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033489A (en) * | 2010-12-16 | 2011-04-27 | 成都天奥电子股份有限公司 | Multifunctional Beidou second generation satellite time service watch and realizing method thereof |
| CN102033489B (en) * | 2010-12-16 | 2012-11-14 | 成都天奥电子股份有限公司 | Multifunctional Beidou second generation satellite time service watch and realizing method thereof |
| CN102109814A (en) * | 2010-12-31 | 2011-06-29 | 北京昆腾微电子有限公司 | Device and method for acquiring electric wave time signals |
| CN102109814B (en) * | 2010-12-31 | 2013-03-06 | 北京昆腾微电子有限公司 | Device and method for acquiring electric wave time signals |
| CN103033828A (en) * | 2012-12-14 | 2013-04-10 | 北京东方联星科技有限公司 | High-sensitivity compass-assisted time servicing device, time service receiver and time service method |
| CN103033828B (en) * | 2012-12-14 | 2015-02-04 | 北京东方联星科技有限公司 | High-sensitivity compass-assisted time servicing device, time service receiver and time service method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: GUOXIN JUNCHUANG (YUEYANG) 6906 TECHNOLOGY CO., LTD. Assignor: Hunan Chuangyue Electronic Technology Co., Ltd. Contract record no.: 2011430000218 Denomination of utility model: Big dipper-1 passive positioning time service terminal Granted publication date: 20100804 License type: Exclusive License Record date: 20111017 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100804 Termination date: 20151113 |
|
| EXPY | Termination of patent right or utility model |