CN201266236Y

CN201266236Y - Time service navigation receiver

Info

Publication number: CN201266236Y
Application number: CNU2008201098350U
Authority: CN
Inventors: 姜楠; 陈亮
Original assignee: Beijing Sdi Tech Development Co Ltd
Current assignee: Beijing SDi Science & Technology Co., Ltd.
Priority date: 2008-08-19
Filing date: 2008-08-19
Publication date: 2009-07-01
Anticipated expiration: 2018-08-19

Abstract

The utility model discloses a time service navigation receiver comprising a GPS module, a DSP digital processing unit and an output interface, wherein the GPS module is connected with a GPS antenna and can gather GPS satellite digital information and output a second pulse signal, the digital information acquired by the GPS module is transmitted to the DSP digital processing unit for processing to obtain navigation location information and time information, and meanwhile, the DSP digital processing unit sends the second pulse signal of the GPS module to a signal conversion module, the second pulse signal is converted into a signal matched with the output interface, and the DSP digital processing unit is connected with the output interface which outputs the navigation location information, the time information and the second pulse signal. The utility model has location and time service functions, adopts the stable and reliable GPS module in the center and the DSP digital processing unit at the periphery and has stronger anti-interference.

Description

The time service navigation neceiver

Technical field

The utility model is about the technology of navigator fix and precise time aligning, is specifically related to a kind of time service navigation neceiver.

Background technology

To be the U.S. develop since 1970's GPS (Global Positioning System-GPS), last 20 years, expensive 20,000,000,000 dollars, built up in 1994 comprehensively, have the new generation satellite navigation and the positioning system of carrying out comprehensive real-time three-dimensional navigation and station-keeping ability in sea, land and sky.Show through nearly 10 years uses of department such as China's mappings, GPS is with distinguishing features such as round-the-clock, high precision, robotization, high benefits, win vast mapping operations person's trust, and successfully be applied to multiple subjects such as geodetic surveying, engineering survey, photogrammetric measurement, delivery vehicle navigation and control, earth movement monitoring, engineering project deformation monitoring, resources survey, geodynamics, thereby bring the field depth technological revolution at quarter to survey field.Along with updating of GPS, hardware and software constantly perfect, application is developing constantly, has spreaded all over the various departments of national economy at present, and daily life is progressively goed deep in beginning.

GPS is not only the high precision GPS, and is high-precision real-time time reference signal.Time unification can provide unified standard time information and time reference signal for guided missile, space experiment and large-scale experiment system, with the time unification of the cover system realizing being made up of various electronic equipments and computing machine.GPS can provide accurate position and time at the anywhere of the earth based on the radio navigation system in space, and constantly carries out clock correction between a plurality of website and correct (error of (during the GPS) of satellite time and control station cesium-beam atomic clock).Disperse the maximum error of time signal 1pps (pulse per second (PPS)) and standard time of distant each GPS receiver output of thousands of kilometers to be no more than ± 100ns.In addition, the GPS receiver can comprise the statement of current UTC time (Coordinated Universal Time(UTC)) by serial ports output, therefore, and when all adopting the gps time school as if each measuring and controlling equipment that is dispersed in various places, then can remove the temporal information transmission of each measuring and controlling equipment and measurement and control center from, and obtain high precision time synchronization.

Therefore utilize GPS can realize global the location and time service round-the-clockly, and have advantages such as cost is low, signal stabilization, very big application market and researching value are arranged.

The utility model content

The purpose of this utility model is, utilizes existing GPS technology, and a kind of time service navigation neceiver that integrates location and time service function is provided.

The technical solution of the utility model is:

A kind of time service navigation neceiver, it is characterized in that, comprise a GPS module, one DSP digital processing unit and output interface, above-mentioned GPS module connects a gps antenna, collect gps satellite numerical information, and the exportable one-second burst signal of above-mentioned GPS module, the digital information transmission that the GPS module collects is handled to the DSP digital processing unit, obtain navigator fix information and temporal information, simultaneously, described DSP digital processing unit sends to a signal conversion module with the pps pulse per second signal of above-mentioned GPS module, this pps pulse per second signal is converted into the signal that is complementary with output interface, described DSP digital processing unit is connected with output interface, and this output interface is with above-mentioned navigator fix information, temporal information and pps pulse per second signal output.

Described DSP digital processing unit comprises and resolves module, and this resolves module and is used for that the GPS module is collected satellite information and calculates, and obtains navigator fix information and temporal information.

Described DSP digital processing unit comprises a filtration module, is used for that the GPS module is collected satellite information and carries out Filtering Processing.

Described DSP digital processing unit is connected with a storer, and the DSP digital processing unit is kept at above-mentioned navigator fix information and temporal information in this storer.

Also comprise a traffic filter, this traffic filter is used for gps satellite signal is carried out pre-service between GPS module and gps antenna.

Described output interface can be the RS232 interface.

Compared with prior art, the beneficial effects of the utility model are:

The utility model integrates location and time service function, core adopts reliable and stable GPS module, and the periphery is aided with DSP digital processing unit and wave filter, and its volume is little, in light weight, low in energy consumption, location and capture time weak point first again have powerful antijamming capability.

The utility model can pass through the RS232 standard serial port, is directly connected to subscriber equipmenies such as PC, industrial computer, exports location navigation and temporal information in real time.It is easy and simple to handle, is easy to use, and greatly makes things convenient for the user to carry out secondary development.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the block diagram of the utility model embodiment;

Fig. 3 is the processing flow chart of the utility model time service software.

Embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail:

Gps satellite sends ephemeris parameter, C/A sign indicating number and temporal information incessantly earthward by carrier wave, after the user receives these information, obtains the distance of receiver to every satellite through calculating, and solves the three dimensional local information of receiver according to co-ordinates of satellite.

Gps system is a big resource system, and with regard to the abundant exploitation of this system, widespread use, only the navigation locating function of applying GPS system is also imperfect, the precise time that gps system provides, and field equally is widely used.

Cesium-beam atomic clock all is installed on the gps satellite, thereby has very high frequency accuracy and (can reach 1 * 10 ^-12) and time precision.Temporal information in the GPS information and timing signal can be on the earth any position and the space user provides service, and wherein the moment precision of the 1PPS of Huo Deing (standard second) signal reaches as high as ± 10ns; Therefore, utilize standard time and timing signal in the GPS information, can realize the foundation of standard time yardstick and high precision time (frequency) unified and synchronously and the split-second precision frequency ratio right.

In the computing machine time service method, great majority all are the temporal informations of first acquisition standard, directly revise system time by Windows core bottom function afterwards at present.In this process, the accuracy of temporal information has just determined the precision of computer system time service.That is to say that a high precision time reference source is absolutely necessary.

With reference to figure 1, the utility model time service navigation neceiver comprises a GPS module, one DSP digital processing unit and output interface, the GPS module connects a gps antenna, collect gps satellite numerical information, and the exportable one-second burst signal of GPS module, the digital information transmission that the GPS module collects is handled to the DSP digital processing unit, obtain navigator fix information and temporal information, the utility model utilizes the DSP digital processing unit that the gps signal of input is also further carried out the digital filtering algorithm processing, use location algorithm, the direct pseudorange that the GPS module is gathered, information such as time and ephemeris is resolved, eliminate the disturbing effects such as multipath effect that the location is had the greatest impact, effectively improved bearing accuracy, antijamming capability and reliability.

The utility model time reference source has been selected for use current the most popular, and the time that also is the highest relatively a kind of clock source-GPS Global Positioning System (GPS) of precision is as benchmark.Mainly utilize the GPS module, this module provides two kinds of output signals, and a kind of is pulse per second (PPS) 1PPS signal, and the precision of this signal reaches as high as ± 10ns.Another kind is the time data of longitude, latitude, height coordinate and the UTC (UTC Universal Time Coordinated) that comprise Current GPS antenna position.The theory diagram of hardware components is seen Fig. 2.

The GPS module receives the signal of gps satellite by gps antenna, and data such as output time, longitude and latitude.In addition, the GPS module also can produce a pps pulse per second signal 1PPS constantly at whole second, and this signal inserts DB9 interface first pin through after the signal conversion module by dsp chip.

The utility model can pass through the RS232 standard serial port, is directly connected to subscriber equipmenies such as computing machine, industrial computer, exports navigator fix information and temporal information in real time.

The supporting computing machine time service software program part process flow diagram of the utility model is seen Fig. 3.

At first serial ports is detected and disposes, after configuration is finished, wait for that the serial ports carrier signal of the 1st pin of DB9 is interrupted.After the GPS module produces pulse per second (PPS), at first, judge that whether the current time and time interval last time are greater than 1 second.If judged result, is then thought wrong the interruption less than 1 second, withdraw from and wait for interruption arrival next time.If judged result, judges whether the GPS state is normal, if GPS does not receive effective temporal information, then reminder-data is invalid in display interface greater than 1 second again.Secondly, judge the data mode that received last time, do not locate then data that the unavailable wait of data receives next time,, then time second in the time data was added for 1 back update the system time, and show not at software interface if data can be used if GPS has.

After time service software was opened, program can be moved automatically according to setting relevant in the registration table.After program receives look-at-me,, then revise the time of computing machine by the bottom function of Windows if the GPS state is normal.And in display interface, show current time and the on-site longitude and latitude of user.The operation that this software is can be on the general calculation machine stable.The operating system of supporting is Windows 2000 and Windows XP.

The realization of DB9 interface is provided in the present embodiment, but corresponding structure also PCI or other forms of interface.In addition, signal conversion module can be converted to the multiple way of outputs such as output RS232, the output of 422 balanced types, Transistor-Transistor Logic level according to the different function selecting of user.

In addition, the utility model is solidificated in almanac, ephemeris, time data, navigator fix information among the EEPROM, need not battery and also can preserve.When shutdown, outage, reacquisition is better than 1 second positioning time.Can not cause loss of data owing to the cell voltage deficiency.

More than by specific embodiment time service navigation neceiver provided by the utility model has been described, it will be understood by those of skill in the art that in the scope that does not break away from the invention essence, can make certain deformation or modification to the utility model.

Claims

1, a kind of time service navigation neceiver, it is characterized in that, comprise a GPS module, one DSP digital processing unit and output interface, above-mentioned GPS module connects a gps antenna, collect gps satellite numerical information, and the exportable one-second burst signal of above-mentioned GPS module, the digital information transmission that the GPS module collects is handled to the DSP digital processing unit, obtain navigator fix information and temporal information, simultaneously, described DSP digital processing unit sends to a signal conversion module with the pps pulse per second signal of above-mentioned GPS module, this pps pulse per second signal is converted into the signal that is complementary with output interface, described DSP digital processing unit is connected with output interface, and this output interface is with above-mentioned navigator fix information, temporal information and pps pulse per second signal output.

2, time service navigation neceiver as claimed in claim 1 is characterized in that, described DSP digital processing unit comprises and resolve module, and this resolves module and is used for that the GPS module is collected satellite information and calculates, and obtains navigator fix information and temporal information.

3, time service navigation neceiver as claimed in claim 1 or 2 is characterized in that, described DSP digital processing unit comprises a filtration module, is used for that the GPS module is collected satellite information and carries out Filtering Processing.

As claim 1 or 2 time service navigation neceivers, it is characterized in that 4, described DSP digital processing unit is connected with a storer, the DSP digital processing unit is kept at above-mentioned navigator fix information and temporal information in this storer.

5, time service navigation neceiver as claimed in claim 1 is characterized in that, also comprises a traffic filter, and this traffic filter is used for gps satellite signal is carried out pre-service between GPS module and gps antenna.

6, time service navigation neceiver as claimed in claim 1 is characterized in that, described output interface is the RS232 interface.