CN103439712A - Beidou satellite navigation system and navigation method thereof - Google Patents
Beidou satellite navigation system and navigation method thereof Download PDFInfo
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- CN103439712A CN103439712A CN2013103528077A CN201310352807A CN103439712A CN 103439712 A CN103439712 A CN 103439712A CN 2013103528077 A CN2013103528077 A CN 2013103528077A CN 201310352807 A CN201310352807 A CN 201310352807A CN 103439712 A CN103439712 A CN 103439712A
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- big dipper
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- beidou satellite
- satellite navigation
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Abstract
The invention discloses a Beidou satellite navigation system which comprises a Beidou receiving antenna, a star-searching module, a navigation map, a sound output unit and a display touch unit. The star-searching module comprises a low-noise amplifier, a digital processing base band circuit and a central processor, the digital processing base band circuit is connected with and communicated with the central processor through a series port, the low-noise amplifier sequentially passes through a filter and a mixer circuit to be electrically connected with the digital processing base band circuit, and communication pins of a Beidou digital processing base band chip are respectively connected with the series port communication end of the central processor. The Beidou satellite navigation system is respectively filtered by the Beidou filter in a separation mode, and due to the fact that signal loss during frequency mixing is small, and the accuracy of the filtering can be greatly improved during the filtering process; compared with the processes that frequency mixing is conducted at first and then filtering is conducted, the filtering process in the separation mode can obtain the signal acquisition state preferably, and reduces signal loss caused by filtering and frequency mixing to the minimum extent.
Description
Technical field
The present invention relates to the satellite navigation field, be specifically related to a kind of vehicle-mounted Beidou satellite navigation.
Background technology
Current automobile multimedia navigation system is domestic is all the GPS single mode, yet in the use of GPS, its precision is subject to certain control, and on State-level, for national security, the development dipper system is necessary, and for supporting national Big Dipper navigation cause, national government proposes will progressively enlarge the plan of using the Big Dipper navigation coming years.But the big-dipper satellite number that our country launches at present very little, cause the Big Dipper sometimes to receive the star effect not ideal, so in civil area, the utilization rate of Big Dipper navigation all remains at low levels always, the patent No. is 201210398693.5 to disclose the mode that a kind of signal separates, it carries out mixing after by bimodulus receiving antenna receiving satellite signal, pass through again Big Dipper wave filter, the filtering respectively of GPS wave filter, and then draw corresponding signal frequency range and be input to and search in the star module, in this process, due to needs mixing and then filtering, the signal finally drawn will have certain decay, if this part decay is original with regard in not too strong at the signal received, determined can't receive enough strong signal and process this signal and be presented on map, and this operates in outside and watches and can't know, this just allows the probability of originally searching the normal use of the less-than-ideal dipper system of star effect further reduce.
Summary of the invention
Technical matters to be solved by this invention is to provide and a kind ofly can makes up and improve satellite-signal and can't receive or receive in some cases the excessively weak drawback of signal; The present invention also provides a kind of air navigation aid of the Big Dipper, and it can be more intelligent and receives navigation information with stronger signal.
The technical scheme of technical solution problem of the present invention is as follows:
A kind of Beidou satellite navigation system, comprise Big Dipper receiving antenna, search the star module, navigation map, voice output unit and demonstration touch unit, the described star module of searching comprises low noise amplifier, digital processing baseband circuit and central processing unit, Big Dipper receiving antenna is connected with described low noise amplifier, described digital processing baseband circuit and central processing unit are by the serial ports connecting communication, described central processing unit connects described demonstration touch unit, voice output unit and navigation map, described low noise amplifier passes through bandpass filter successively, mixting circuit and described digital processing baseband circuit are electrically connected, described digital processing baseband circuit comprises Big Dipper digital processing baseband chip, the reception data pin (RXD1) of Big Dipper digital processing baseband chip is connected with the serial communication end of central processing unit respectively with transmission data pin (TXD1), Big Dipper digital processing baseband chip is through catching, follow the tracks of and positioning calculation, process and obtain longitude and latitude and elevation information and send to central processing unit by receiving data pin.Further, described Big Dipper mixting circuit output 4MHz intermediate-freuqncy signal.
Described central processing unit matches the coordinate of navigation map with obtaining the latitude and longitude information of processing, described demonstration touch unit displaing coordinate is graph region accordingly.
As to the further describing of above-mentioned Beidou satellite navigation system, Big Dipper digital processing baseband chip is provided with light emitting diode for the time clock pin that receives the satellite pulse signal.
A kind of Beidou satellite navigation method, comprise the steps:
A. utilize Big Dipper receiving antenna to receive Big Dipper satellite signal;
B. the satellite-signal received amplifies through low noise amplifier;
C. amplifying signal passes through Big Dipper bandpass filter and Big Dipper mixting circuit successively, output Big Dipper frequency band signals;
D. export Big Dipper frequency band signals and enter Big Dipper digital processing baseband chip and processed, Big Dipper digital processing baseband chip by catching, tracking and positioning calculation, process and obtain positional information, described positional information comprises longitude and latitude and elevation information;
E. Big Dipper digital processing baseband chip transfers to central processing unit by serial ports by positional information, and central processing unit loads navigation map, and output map information and audio-frequency information.
As to the further describing of above-mentioned Beidou satellite navigation method, step c further is handled as follows: described Big Dipper mixting circuit carries out Frequency mixing processing to Big Dipper frequency band signals, obtains the 4MHz intermediate-freuqncy signal.
As to the further describing of above-mentioned Beidou satellite navigation method, the time clock pin of described Big Dipper digital processing baseband chip is connected to light emitting diode, luminescence display while receiving the satellite pulse signal.
As further describing above-mentioned Beidou satellite navigation method, Big Dipper digital processing baseband chip obtains positional information, central processing unit reads the map reference header file and mates with positional information, navigation map matching area data also export the demonstration touch unit to, and described navigation map area data comprises urban road figure and map body frame composition.
The invention has the beneficial effects as follows: " Big Dipper " has location and the double action of communicating by letter, and the SMS communication function possessed is exactly that GPS is not available.12 meter of " Big Dipper " positioning precision, adopt receiving terminal not need to lay ground base station, and the ship at disaster center just can send information one second.Based on national security, consider, China is just greatly developing Big Dipper cause, is no matter in the situation that promptly be cut off the GPS communication that transmits, or all can uses under normal circumstances Big Dipper navigation.In order to solve the signal Receiver Problem, in this system and disposal route, first the low noise amplifier amplifying signal is passed through respectively to Big Dipper wave filter separating filtering, the loss of signal during due to mixing is comparatively little, thereby can greatly improve the accuracy of filtering in this filtering, compare the mixing process of filtering again, can more preferentially obtain the situation of signal acquisition state, and Min. reduces the loss of signal that filtering and mixing bring.
The accompanying drawing explanation
Fig. 1 is signal processing flow figure of the present invention;
The circuit theory diagrams that Fig. 2 is linking number word processing baseband chip of the present invention.
Embodiment
Further illustrate the present invention below in conjunction with accompanying drawing 1～accompanying drawing 2.
A kind of Beidou satellite navigation system of the present invention, comprise Big Dipper receiving antenna, search the star module, navigation map, voice output unit and demonstration touch unit, the described star module of searching comprises low noise amplifier, digital processing baseband circuit and central processing unit, Big Dipper receiving antenna is connected with described low noise amplifier, described digital processing baseband circuit and central processing unit are by the serial ports connecting communication, described central processing unit connects described demonstration touch unit, voice output unit and navigation map, described low noise amplifier passes through bandpass filter successively, mixting circuit and described digital processing baseband circuit are electrically connected, described digital processing baseband circuit comprises Big Dipper digital processing baseband chip, the reception data pin (RXD1) of Big Dipper digital processing baseband chip is connected with the serial communication end of central processing unit respectively with transmission data pin (TXD1), Big Dipper digital processing baseband chip is through catching, follow the tracks of and positioning calculation, process and obtain longitude and latitude and elevation information and send to central processing unit by receiving data pin.Further, described Big Dipper mixting circuit carries out mixing and exports the 4MHz intermediate-freuqncy signal the signal of bandpass filter.
Described central processing unit matches the coordinate of navigation map with obtaining the latitude and longitude information of processing, described demonstration touch unit displaing coordinate is graph region accordingly.
As to the further describing of above-mentioned Beidou satellite navigation system, Big Dipper digital processing baseband chip is provided with light emitting diode for the time clock pin that receives the satellite pulse signal.
As a kind of preferred version, the speed that the port of Beidou satellite navigation system connects is 4800 or 9600 bauds (bit), described navigation map is with the described central processing unit of searching the star module to there being a plurality of serial ports port COM1～COM9 to select to be connected, and one between navigation map and central processing unit in serial ports port COM1～COM9 is carried out data communication.
A kind of Beidou satellite navigation method, comprise the steps:
A. utilize Big Dipper receiving antenna to receive Big Dipper satellite signal;
B. the satellite-signal received amplifies through low noise amplifier;
C. amplifying signal passes through Big Dipper bandpass filter and Big Dipper mixting circuit successively, output Big Dipper frequency band signals;
D. export Big Dipper frequency band signals and enter Big Dipper digital processing baseband chip and processed, Big Dipper digital processing baseband chip by catching, tracking and positioning calculation, process and obtain positional information, described positional information comprises longitude and latitude and elevation information;
E. Big Dipper digital processing baseband chip transfers to central processing unit by serial ports by positional information, and central processing unit loads navigation map, and output map information and audio-frequency information.
As to the further describing of above-mentioned Beidou satellite navigation method, step c further is handled as follows: described Big Dipper mixting circuit carries out Frequency mixing processing to Big Dipper frequency band signals, obtains the 4MHz intermediate-freuqncy signal.In the processing procedure of published patent, be first mixing filtering again, and the present invention is by first filtering mixing again, can in the process of filtering, learn the power of signal, thereby signal that can priority processing filtering is mixed down the 4MHz intermediate-freuqncy signal again, and this process can make output signal more stable.
As to the further describing of above-mentioned Beidou satellite navigation method, between central processing unit and Big Dipper digital processing baseband chip, be serial communication, it carries out the transmission on data by TXD1 and RXD1.
As a kind of preferred version of Beidou satellite navigation method, the time clock pin of described Big Dipper digital processing baseband chip is connected to and shows the LED-ORG that receives the satellite pulse signal.The satellite pulse signal was outwards launched the PPS signal every one second, LED-ORG receives the voltage signal that this pulse signal is corresponding and realizes glittering effect, thereby can recognize more intuitively the situation of receiving satellite signal.
As further describing above-mentioned Beidou satellite navigation method, Big Dipper digital processing baseband chip obtains positional information, central processing unit reads the indexing head file of navigation map, owing to there being the attribute information of data in the indexing head file, as map ID, type, coordinate range, zone name and map file store path etc., navigation can be by positional information and map data matching, data can be determined the path of depositing of map data file according to the map, and then call by this path, load corresponding map area, and export the demonstration touch unit to, described navigation map area data comprises urban road figure and map body frame composition, further comprise the position communication chart that other are attached, as hotel, restaurant, petrol station, the position information such as famous tourist attractions.
Above embodiment is merely illustrative and not limiting to the invention, and the equivalence of doing according to the described method of patent claim of the present invention therefore all changes or modifies, and is included in patent claim of the present invention.
Claims (9)
1. a Beidou satellite navigation system, comprise Big Dipper receiving antenna, search the star module, navigation map, voice output unit and demonstration touch unit, the described star module of searching comprises low noise amplifier, digital processing baseband circuit and central processing unit, Big Dipper receiving antenna is connected with described low noise amplifier, described digital processing baseband circuit and central processing unit are by the serial ports connecting communication, described central processing unit connects described demonstration touch unit, voice output unit and navigation map, it is characterized in that: described low noise amplifier passes through bandpass filter successively, mixting circuit and described digital processing baseband circuit are electrically connected, described digital processing baseband circuit comprises Big Dipper digital processing baseband chip, the reception data pin of Big Dipper digital processing baseband chip is connected with the serial communication end of central processing unit respectively with the transmission data pin, Big Dipper digital processing baseband chip is through catching, follow the tracks of and positioning calculation, process to obtain longitude and latitude and elevation information and the reception data pin by Big Dipper digital processing baseband chip sends to central processing unit.
2. a kind of Beidou satellite navigation system according to claim 1 is characterized in that: Big Dipper digital processing baseband chip is provided with light emitting diode for the time clock pin that receives the satellite pulse signal.
3. a kind of Beidou satellite navigation system according to claim 1 is characterized in that: described central processing unit by the coordinate of navigation map with obtain the latitude and longitude information pairing of processing, described demonstration touch unit displaing coordinate is graph region accordingly.
4. a kind of Beidou satellite navigation system according to claim 1, is characterized in that: described Big Dipper mixting circuit output 4MHz intermediate-freuqncy signal.
5. a kind of Beidou satellite navigation system according to claim 1 is characterized in that: the speed that the port of Beidou satellite navigation system connects is 4800 or 9600 bauds.
6. a Beidou satellite navigation method, comprise the steps:
A. utilize Big Dipper receiving antenna to receive Big Dipper satellite signal;
B. the satellite-signal received amplifies through low noise amplifier;
C. amplifying signal passes through Big Dipper bandpass filter and Big Dipper mixting circuit successively, output Big Dipper frequency band signals;
D. export Big Dipper frequency band signals and enter Big Dipper digital processing baseband chip and processed, Big Dipper digital processing baseband chip by catching, tracking and positioning calculation, process and obtain positional information, described positional information comprises longitude and latitude and elevation information;
E. Big Dipper digital processing baseband chip transfers to central processing unit by serial ports by positional information, and central processing unit loads navigation map, and output map information and audio-frequency information.
7. a kind of Beidou satellite navigation method according to claim 6, is characterized in that, step c further comprises the steps: that described Big Dipper mixting circuit carries out Frequency mixing processing to Big Dipper frequency band signals, obtains the 4MHz intermediate-freuqncy signal.
8. a kind of Beidou satellite navigation method according to claim 6, it is characterized in that: Big Dipper digital processing baseband chip obtains positional information, central processing unit reads the map reference header file and mates with positional information, navigation map matching area data also export the demonstration touch unit to, and described navigation map area data comprises urban road figure and map body frame composition.
9. a kind of Beidou satellite navigation method according to claim 6, it is characterized in that: the attribute information of described navigation map comprises map ID, type, coordinate range, zone name and map file store path.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570030A (en) * | 2015-01-09 | 2015-04-29 | 芜湖航飞科技股份有限公司 | Ship and warship Beidou satellite navigation and positioning system |
| CN105676243A (en) * | 2016-01-11 | 2016-06-15 | 昆明理工大学 | Non-geometric phase and ionosphere residual method-based Beidou three-frequency cycle-slip detection method |
| CN107064971A (en) * | 2017-04-12 | 2017-08-18 | 贵州北斗空间信息技术有限公司 | A kind of Big Dipper satellite signal receives display circuit |
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| CN1285980A (en) * | 1998-11-11 | 2001-02-28 | 三星电子株式会社 | Receiver for pseudo-noise signals from satellite radio-navigation systems |
| CN202218416U (en) * | 2011-09-09 | 2012-05-09 | 航天恒星科技有限公司 | Collecting terminal of disaster situation information |
| CN102540219A (en) * | 2010-12-31 | 2012-07-04 | 和芯星通科技(北京)有限公司 | Receiving method and receiver for signal of global navigation satellite system |
| CN203572967U (en) * | 2013-08-14 | 2014-04-30 | 东莞市科维电子科技有限公司 | Beidou navigation system |
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2013
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Patent Citations (4)
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| CN1285980A (en) * | 1998-11-11 | 2001-02-28 | 三星电子株式会社 | Receiver for pseudo-noise signals from satellite radio-navigation systems |
| CN102540219A (en) * | 2010-12-31 | 2012-07-04 | 和芯星通科技(北京)有限公司 | Receiving method and receiver for signal of global navigation satellite system |
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| CN203572967U (en) * | 2013-08-14 | 2014-04-30 | 东莞市科维电子科技有限公司 | Beidou navigation system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104570030A (en) * | 2015-01-09 | 2015-04-29 | 芜湖航飞科技股份有限公司 | Ship and warship Beidou satellite navigation and positioning system |
| CN105676243A (en) * | 2016-01-11 | 2016-06-15 | 昆明理工大学 | Non-geometric phase and ionosphere residual method-based Beidou three-frequency cycle-slip detection method |
| CN107064971A (en) * | 2017-04-12 | 2017-08-18 | 贵州北斗空间信息技术有限公司 | A kind of Big Dipper satellite signal receives display circuit |
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Application publication date: 20131211 |