CN2795873Y - Global positioning system receiver based on virtual difference technology - Google Patents

Global positioning system receiver based on virtual difference technology Download PDF

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Publication number
CN2795873Y
CN2795873Y CNU2005200058013U CN200520005801U CN2795873Y CN 2795873 Y CN2795873 Y CN 2795873Y CN U2005200058013 U CNU2005200058013 U CN U2005200058013U CN 200520005801 U CN200520005801 U CN 200520005801U CN 2795873 Y CN2795873 Y CN 2795873Y
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China
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gps
wireless network
microprocessor
serial
gps receiver
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Expired - Fee Related
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CNU2005200058013U
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Chinese (zh)
Inventor
汪懋华
何月芳
张漫
刘刚
高华江
曾祥钟
司永胜
王�琦
张淼
郑典萍
张俊宁
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China Agricultural University
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China Agricultural University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture

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Abstract

The utility model relates to a global positioning system receiver, particularly a global positioning system receiver based on the technology of virtual difference. The utility model is composed of a GPS receiving circuit, a microprocessor, a communication module of a wireless network, a display and storage device, and a serial port expanding and voltage converting circuit. The utility model communicates with a virtual reference station through the communication module of a wireless network to obtain difference information, thereby, the GPS receiving circuit outputs high precision GPS information on which difference correction is carried out, and GPS data can be displayed and stored in the real-time manner. The utility model has the advantages of low cost, simplicity and portability. The utility model is suitable for being used in positioning devices in the implementation of precision agriculture and other fields.

Description

GPS receiver based on virtual differential technique
Technical field
The utility model relates to a kind of GPS (Global Position System is hereinafter to be referred as GPS) receiver, particularly relates to a kind of GPS receiver based on virtual differential technique.
Background technology
In precision agriculture, the various field datas and the information of gathering are implemented precisely to manage to depend on accurate positional information, and the GPS technology is quick, the most convenient effective and efficient manner that positions measurement at present, has become to implement the essential condition that precision agriculture is supported the agricultural modernization practice.
Further improving GPS receiver real-time positioning precision is one of problem that needs at present research.Because the GPS receiver, the unit bearing accuracy is too low, can not satisfy the especially requirement of precision agriculture of practical application, adopts the mode of difference to improve bearing accuracy usually.The GPS receiver often adopts satellite difference, beacon difference or autonomous differential mode to improve bearing accuracy at present, yet the practical application of these three kinds of modes all is very limited.The satellite differential service is paid, need to pay by service time, and this service can not cover the whole country; Beacon station only just has in China's Coastal Areas, though for example can receive the differential correcting signal of Tianjin beacon station emission in Beijing, because of distance, signal is stable inadequately, also is restricted so use; The difference reference station that adopts autonomous differential mode to set up is a kind of scheme that does not have territorial restrictions, but the coverage of this difference reference station becomes positive relation-changing with the data radio station power that sends differential signal, and measuring error with between reference station and movement station the distance increase, be difficult to satisfy high-precision positioning requirements.
In this case, the notion of the virtual reference station VRS that U.S. Trimble company is proposed (Virtual ReferenceStation is called for short VRS) has been broken above-mentioned restriction.In use, the systematic error of reference station data is reduced or eliminates, and means that so not only the user can increase the distance between movement station and reference station, has also increased the reliability of system, and has reduced the initialized time.With conventional RTK (Real-Time-Kinematic, the abbreviation of the real-time carrier phase difference of GPS) difference, in the VRS network, each fixed reference station does not directly send any correcting information to the mobile subscriber, but all raw data are issued control center by data communication line.Simultaneously, the mobile subscriber is before work, send a rough coordinates by wireless network (as GSM network or GPRS network or cdma network etc.) to control center earlier, after this positional information is received by control center, according to customer location, select one group of best fixed reference station automatically by computing machine, the information of sending according to these stations, integrally correct the error that orbit error, ionosphere, troposphere and the atmospheric refraction of GPS cause, high-precision differential signal is issued movement station.The effect of this differential signal is equivalent to generate a virtual reference station on the movement station next door, thereby has solved the last restricted problem of RTK operation distance, and has guaranteed user's precision; The user also removes purchase from and has set up the GPS reference station simultaneously.At present, Beijing's whole world satellite integrated application service system has tentatively been built 5 reference stations, 1 data center, and service range can cover eight districts of the city, Beijing, and plans reference station is expanded to 28, to cover all cities, Beijing and suburban country and district.System after building up can provide differential data for the running fix user by the network differential mode, is not subjected to the restriction of distance, can satisfy the user's request of different industries different accuracy requirement.
At present, for the mobile subscriber, the high accurate GPS receiver that Trimble company is released has possessed the function that receives virtual difference information, and as the product of models such as 5700, but the price of this series products is generally higher; The GPS receiver that price is lower does not possess the ability that receives this difference information that sends with wireless network forms again, makes the application of VRS be subjected to very big restriction, has limited the widespread use of GPS receiver simultaneously yet.In the case, just need to design, develop a kind of cost low, have and receive virtual difference information, possess that locator data is handled and the GPS receiving system of memory function simultaneously again.
Summary of the invention
The purpose of this utility model is to provide a kind of GPS receiver based on virtual differential technique, and this system cost is low, simply portable, can gather and show the high-precision GPS information with difference information in real time, and can be stored in the memory device.
In order to achieve the above object, the utility model adopts following technical scheme:
As shown in Figure 1, this GPS receiver comprises:
One microprocessor 1 is used for the initialization, data processing of system and to the monitoring of total system;
One wireless network communication module 2 is connected with microprocessor 1, and this module is by sending and receiving information between wireless network and the virtual reference station control center (not shown in figure 1);
One GPS receiving circuit 3 is used to receive gps data, and this circuit has at least two serial ports that comprise first serial and second serial;
One expansion serial port circuit 7 is connected with microprocessor 1, expands at least two serial ports that comprise first serial and second serial, through being connected with second serial with the first serial of GPS receiving circuit 3 respectively behind first voltage conversion circuit 9;
One client identification module 6 is connected with wireless network communication module 2, is used to discern client identity, and the client finishes and being connected and message exchange of Radio Network System by it;
One power supply 8 is connected with first voltage conversion circuit 9 with microprocessor 1, GPS receiving circuit 3, expansion serial port circuit 7, be connected with wireless network communication module 2 through second voltage conversion circuit 10, for each several part circuit and module in the system provide stable operating voltage.
In the technique scheme, also comprise a display module 5,, be connected, be used for showing in real time the GPS information of gathering with microprocessor 1 by parallel interface 11.
In the technique scheme, also comprise a memory device 4, be connected, be used to store gps data with microprocessor 1.
In the technique scheme, described client identification module 6 is made up of client's identification card deck and client's identification card.
In the technique scheme, described wireless network is meant the GSM network, or GPRS network, or cdma network.
The course of work of the present utility model is: microprocessor 1 carries out after the initialization setting GPS receiving circuit 3 by the first serial of expansion serial port circuit 7, and GPS receiving circuit 3 begins to receive gps data.This gps data is not because carry out difference correction, and error is bigger, and bearing accuracy is low.Microprocessor 1 is controlled wireless network communication module 2 via control command, utilize wireless network communication module 2 gps data that receives before this GPS receiver to be sent to VRS control center by wireless network, VRS control center carries out Error Calculation according to this information, again with RTCM (Radio Technical Commission for Maritime Services, be called for short RTCM) difference information with the microprocessor 1 of wireless network real-time Transmission to this GPS receiver; Microprocessor 1 is imported this RTCM difference information by the second serial of expansion serial port circuit 7 again from the second serial of GPS receiving circuit 3, the output of the first serial of GPS receiving circuit 3 is through the gps data after the difference correction.Data can show in display module 5 that the user can understand self present position in real time after handling through microprocessor 1 more on the one hand; On the other hand, this gps data also can be stored in the memory device 4.
Compared with prior art, the beneficial effects of the utility model are:
It is low to the utlity model has cost, reliability height, characteristics low in energy consumption; Can gather through the high-precision GPS data after the difference correction, and the high-precision GPS data that can show collection in real time, be convenient to the user and understand self present position in real time, can also be in jumbo memory device with the data storage of gathering, for the user to the subsequent analysis of data, handle use.
Description of drawings
Fig. 1 is the circuit block diagram of a most preferred embodiment of the present utility model;
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
As shown in Figure 1, microprocessor 1 adopts 8 single chip computer AT 89S51 of high-performance of American ATMEL production.This chip price is low, low in energy consumption, and the capacity of Flash program storage is 4KB, and it to be to write/wipe circulation 1000 times that serviceable life is minimum, is one of higher cpu chip of the present ratio of performance to price.Oscillatory circuit adopts CPU internal oscillator and external quartz crystal to constitute, and crystal oscillation frequency is elected 11.0592MHz as.
Wireless network communication module 2 is selected the MC35i of SIEMENS company, and it not only can support GSM900/1800MHz two-frequency operation pattern, and numeral, voice, short message and facsimile function can be provided, and can support the GPRS data service.On dimensions, volume is less, is easy to integrated.If utilize GPRS network, can adopt the TC45 of SIEMENS company, its design is small and exquisite, power consumption is very low, and built-in ICP/IP protocol stack is supported the JAVA programming, and the solution of economical and efficient can be provided for a lot of communications applications.If utilize cdma network communication, can adopt the Q2358C of WAVECOM company, it is single-frequency 800MHZ, the CDMA20001xRTT module.This
Embodiment adopts the GSM network.
GPS receiving circuit 3 is selected the GPS 25LVS plate of GARMIN company for use, and this is a stable performance, and cost performance compares high product.The GPS OEM plate bulk of this model is little; in light weight; single 5V power supply; built-in protection battery, RS232 level are exported NMEA0183 statement (ascii character type) automatically, the input of RTCM difference; the 1PPS pulse per second (PPS) is rolled into one; its single-point bearing accuracy is less than 15 meters, and difference bearing accuracy 2-5 rice can satisfy the application need under the precision agriculture different situations substantially.In addition, GPS 25LVS plate does not have complex time sequence control, develops more convenient.
The LCM12232B that display module 5 adopts Beijing high official position Creative Company to produce, operating voltage 5V, maximum operating currenbt 1mA is not with character library, and the master controller chip is the graphical dots configuration Liquid Crystal Module of SED1520.Show that with 16*16 a Chinese character and 16*8 show a character, can show two row, 7.5 Chinese characters of every row or 15 characters.Interface circuit adopts the mode of control indirectly, and eight data lines link to each other with parallel interface 11, controls its read-write with the I/O mouth of microprocessor 1 in addition and enables.
Client identification module 6 adopts client's identification card deck and client's identification card to form, and its input end is connected with wireless network communication module 2, and producing voltage by wireless network communication module 2 is the power supply of 3V.Wherein client's identification card is also referred to as smart card, adopts the A level encryption method to make, and is storing user's data, method for authenticating and key, for Radio Network System user identity is differentiated.Simultaneously, the user finishes and being connected and the exchange of information of system by it.
Power supply 8 will provide most of chip operate as normal required 5V voltage; First voltage conversion circuit 9 can be converted into the Transistor-Transistor Logic level of microprocessor 1 the RS232 level of GPS receiving circuit 3; In the present embodiment, the power supply of wireless network communication module 2 has specific (special) requirements, required voltage 4.2V when second voltage conversion circuit 10 is its operate as normal with the 5V voltage transitions.
The memory capacity that the collection of gps data needs is bigger, if adopt RAM or EEPROM, can be subjected to the restriction of factors such as addressing space, power consumption and volume, and price is also very expensive.Therefore, the memory device in the present embodiment 4 uses the CF card to store gps data.CF card capacity is big, and read or write speed is fast, can with multiple computer operating system platform compatibility, durable, can repeatedly read and write.In addition, it supports 3.3V and two kinds of power supplys of 5V, and power consumption is little, and data still can be preserved after outage.
Expansion serial port circuit 7 and parallel interface 11 adopt usual manner to insert.
The course of work of present embodiment is: microprocessor 1 carries out after the initialization setting GPS receiving circuit 3 by the first serial of expansion serial port circuit 7, and GPS receiving circuit 3 begins to receive gps data.This gps data is not because carry out difference correction, and error is bigger, and bearing accuracy is low.(AT is Attention to microprocessor 1, and AT Command Set sends to TA (Terminal Adapter) or DCE (Data Circuit Terminating Equipment) from TE (Terminal Equipment) or DET (Data TerminalEquipment) via the AT order.Send AT by TA, TE and order the function of controlling MS (Mobile Station), carry out alternately with the GSM Network.The user can call out by the AT order, note, phone, data service, supplementary service, the control of aspects such as fax) control wireless network communication module 2, utilize wireless network communication module 2 gps data that receives before the GPS receiver to be sent to VRS control center by wireless network, VRS control center carries out Error Calculation according to this information, again with RTCM (Radio Technical Commission forMaritime Services, be called for short RTCM) difference information with the microprocessor 1 of wireless network real-time Transmission to the GPS receiver; Microprocessor 1 is imported this RTCM difference information by the second serial of expansion serial port circuit 7 again from the second serial of GPS receiving circuit 3, the output of the first serial of GPS receiving circuit 3 is through the gps data after the difference correction.Data can show in display module 5 that the user can understand self present position in real time after handling through microprocessor 1 more on the one hand; On the other hand, this gps data also can be stored in the memory device 4.
It should be noted last that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiments, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is made amendment or is equal to replacement, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims (7)

1, based on the GPS receiver of virtual differential technique, comprise a GPS receiving circuit (3), be used to receive gps data; It is characterized in that, also comprise:
One microprocessor (1) is used for the initialization, data processing of system and to the monitoring of total system;
One wireless network communication module (2) is connected with microprocessor (1), and this module is by sending and receiving information between wireless network and the virtual reference station control center;
One client identification module (6) is connected with wireless network communication module (2), is used to discern client identity, and the client finishes and being connected and message exchange of Radio Network System by it;
One expansion serial port circuit (7) is connected with microprocessor (1), expand at least two serial ports that comprise first serial and second serial, through being connected with second serial with the first serial of described GPS receiving circuit (3) respectively behind first voltage conversion circuit (9);
One power supply (8) is connected with first voltage conversion circuit (9) with microprocessor (1), GPS receiving circuit (3), expansion serial port circuit (7), and be connected with wireless network communication module (2) through second voltage conversion circuit (10), for each circuit and module in the system provide stable operating voltage.
2, GPS receiver according to claim 1 is characterized in that, also comprises a display module (5), by parallel interface (11), is connected with microprocessor (1), is used for showing in real time the GPS information of gathering.
3, GPS receiver according to claim 1 and 2 is characterized in that, also comprises a memory device (4), is connected with microprocessor (1), is used to store gps data.
4, GPS receiver according to claim 1 is characterized in that, described client identification module (6) is made up of client's identification card deck and client's identification card.
5, GPS receiver according to claim 1 is characterized in that, described wireless network is meant the GSM network.
6, GPS receiver according to claim 1 is characterized in that, described wireless network is meant GPRS network.
7, GPS receiver according to claim 1 is characterized in that, described wireless network is meant cdma network.
CNU2005200058013U 2005-03-08 2005-03-08 Global positioning system receiver based on virtual difference technology Expired - Fee Related CN2795873Y (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101008671B (en) * 2006-12-29 2011-09-28 深圳市赛格导航科技股份有限公司 Method, system and device for accurately navigating mobile station
CN104407364A (en) * 2014-11-03 2015-03-11 中国人民解放军63961部队 High precision measuring type Beidou user machine
CN108415048A (en) * 2018-01-23 2018-08-17 武汉大学 Large scale network RTK localization methods based on space clustering and system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101008671B (en) * 2006-12-29 2011-09-28 深圳市赛格导航科技股份有限公司 Method, system and device for accurately navigating mobile station
CN104407364A (en) * 2014-11-03 2015-03-11 中国人民解放军63961部队 High precision measuring type Beidou user machine
CN108415048A (en) * 2018-01-23 2018-08-17 武汉大学 Large scale network RTK localization methods based on space clustering and system
CN108415048B (en) * 2018-01-23 2021-10-22 武汉大学 Large-scale network RTK positioning method and system based on spatial clustering

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Granted publication date: 20060712