CN101583073A

CN101583073A - Wireless data communication device of GNSS network differential correction information

Info

Publication number: CN101583073A
Application number: CNA2009100330462A
Authority: CN
Inventors: 潘树国; 王庆; 张侃; 严伟; 陈亮; 安康
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2009-06-03
Filing date: 2009-06-03
Publication date: 2009-11-18

Abstract

The invention discloses a wireless data communication device of GNSS network differential correction information in satellite navigation positioning equipment, and belongs to network differential correction data forward equipment. The structure of the device comprises a power management module, a singlechip control module, an interface module, a communication module, an oscillation source module and an antenna, wherein the communication module and the interface module are bidirectionally connected with the singlechip control module; the communication module and the interface module are bidirectionally connected; the output end of the oscillation source module is connected with the input end of the singlechip control module; the antenna is connected with the communication module; the power management module respectively provides power for the interface module, the singlechip control module and the communication module; and the interface module is bidirectionally connected with a GPS receiver. The device embeds Ntrip protocol into the equipment, realizes butt joint with a GPS base station, and can transmit RTCM differential data through Internet.

Description

The wireless data communication device of GNSS network differential correcting information

Technical field

The present invention relates to the wireless data communication device of a kind of GNSS network differential correcting information in the satellite navigation equipment for user, belong to network differential correction data forward equipment.

Background technology

Continuously operation satellite fix Reference System (CORS) but integrated application in various fields such as territory mapping, urban planning, cadastral survey manual, town and country construction, weather forecast, car and boat navigation, precision agriculture, tourism exploration, emergency relief and UGISs.Only the domestic single, double frequency GPS receiver in Jiangsu just has tens0000, the total value over ten billion, and present a rapidly rising trend, if these equipment use CORS, just must adopt mobile radio network access, transmission differential correcting information.For this reason, a kind of data transmission device based on wireless telecommunications of development is particularly necessary.

Tradition RTK adopts the UHF radio station to broadcast differential signal, and its frequency is about 450～470MHz, about wavelength 60cm.The coverage and the measurement environment of signal have much relations, and during real time job, because influence of various factors such as tested landform, meteorology, electromagnetic interference sources, the operating distance of general double-frequency GPS receiver has only 5～10Km usually; And when the more local operation of barrier shielding ratios such as mountain area and cities and towns, RTK measures and often can't carry out.

The mobile data mechanics of communication developed rapidly in recent years, utilizing the mobile network to carry out transfer of data becomes a reality, the equipment that GPRS/EGPRS/CDMA carries out transfer of data has appearred on the market, but these equipment are general module, can't dock with the CORS network, can not be used for transmission network differential correcting data.

Summary of the invention

The present invention proposes a kind of wireless data communication device of GNSS network differential correcting information in order to make old GPS equipment can transmit the GPRS data that receive accurately and efficiently.

The wireless data communication device of GNSS network differential correcting information of the present invention, its structure comprises: power management module, single chip control module, interface module, communication module, oscillation source module and antenna, wherein: communication module all links to each other with single chip control module is two-way with interface module, communication module links to each other with interface module is two-way, the oscillation source module connects single chip control module, antenna connects communication module, power management module is given interface module respectively, single chip control module and communication module power supply, interface module links to each other with the GPS receiver is two-way, described single chip control module is a single-chip microcomputer, and interface module is an interface level conversion chip.

The present invention is embedded into Ntrip (Networked Transport of RTCM via Internet Protocol) agreement in the equipment, has realized and the docking of GPS base station, and can propagate the RTCM differential data by Internet; Use apparatus of the present invention, open-air mapping can be adopted the working method of network RTK, need not to set up reference station, has saved the duty personnel in the field work and the time at hypothetical reference station, has reduced operating cost; Improved production efficiency, made tradition " 1+1 " GPS receiver really equal " 2 ", the double raising of production efficiency; Needn't look about the control point, enlarge operating radius; Apparatus of the present invention volume is little, and is in light weight: volume is the 9.7*7.9*2.5 cubic centimetre, and heavily about 250 grams are easy to carry; Price is low: adopt universal elements to manufacture and design, cost is low; Easy to use: field investigation personnel in soil only need a Serial Port Line CORS module can be linked to each other with the GPS receiver, do not need other extras; The present invention can be widely used in numerous high-precision GPS measuring equipments and insert the CORS system, realizes hi-Fix by the network differential correcting information of wireless forwarding.

Description of drawings

Fig. 1 is an overall structure block diagram of the present invention.

Fig. 2 is power management module circuit theory diagrams among the present invention.

Fig. 3 is the single chip circuit schematic diagram of single chip control module among the present invention.

Fig. 4 is an oscillation source modular circuit schematic diagram among the present invention.

Fig. 5 is communication module circuit theory diagrams among the present invention.

Fig. 6 is interface module circuit theory diagrams among the present invention.

Fig. 7 is the workflow diagram of apparatus of the present invention.

Embodiment

As shown in Figure 1, the wireless data communication device of GNSS network differential correcting information of the present invention, its structure comprises: power management module, single chip control module, interface module, communication module, oscillation source module and antenna, wherein: communication module all links to each other with single chip control module is two-way with interface module, communication module links to each other with interface module is two-way, the oscillation source module connects single chip control module, antenna connects communication module, power management module is given interface module respectively, single chip control module and communication module power supply, interface module links to each other with the GPS receiver is two-way

As shown in Figure 2; the linear stabilized power supply J11 of power management module adopts LM1117 among the present invention; Adjustable switch power supply changeover device U1 adopts LM2596S-ADJ; the present invention adopts the lithium battery that larger capacity installs circuit protection additional to power, and power management module is with the 7.2V voltage transitions of lithium battery and be stabilized in 5V and 3.3V gives single chip control module, interface module and communication module power supply.

As shown in Figure 3, the single-chip microcomputer U15 of single chip control module adopts the low-power consumption chip MSP430F149 of Texas Instrument among the present invention, in the mode that sends the AT instruction communication module is controlled.

As shown in Figure 4, the oscillation source module is made up of crystal oscillator X1, resistance R 1 and capacitor C 3, C4 among the present invention, and it provides the crystal oscillation clock for whole system.

As shown in Figure 5, communication module is made up of socket J3 and SIM card J6 among the present invention.

As shown in Figure 6, the interface level conversion chip U6 of interface module adopts MAX3232 among the present invention.

Concrete connected mode is: serial ports 0 output that the serial ports input GR64RX of communication module socket J3 connects single-chip microcomputer U15 is 32 pin, 11 pin of the serial ports output GR64TX connecting interface level transferring chip U6 of socket J3, enable pin 14 pin of socket J3 connect 28 pin of single-chip microcomputer U15, the serial ports 1 of single-chip microcomputer U15 is 9 pin and 10 pin of URXD1 and UTXD1 difference connecting interface level transferring chip U6, and oscillation source module output XT2IN is connected 8 pin and 9 pin of single-chip microcomputer U15 with XT2OUT.

As shown in Figure 7, program determines whether that according to actual conditions needs carry out parameter configuration then earlier with the single-chip microcomputer initialization, if can the fetch equipment parameter, and then device parameter is write Flash, otherwise default value is write Flash.Begin being connected of initialization module and CORS center subsequently, if not successful connection, then whether judge module resets, resetted as module, then returned initialization and be connected this step, do not resetted as module with the CORS center, judge then whether the CORS center is closed, as the CORS closed center, then return initialization and be connected this step, otherwise send general location by UART0 with the CORS center; If successful connection, then judge whether to authorize and pass through, pass through as unauthorized, then return initialization and be connected this step, pass through, then judge whether to be subjected to the data of UART0 as mandate with the CORS center, as do not receive, then return initialization and be connected this step, as received, then by UART1 forward differential correcting information with the CORS center.

Claims

1, a kind of wireless data communication device of GNSS network differential correcting information, it is characterized in that: comprise power management module, single chip control module, interface module, communication module, oscillation source module and antenna, wherein: communication module all links to each other with single chip control module is two-way with interface module, communication module links to each other with interface module is two-way, the oscillation source module connects single chip control module, antenna connects communication module, power management module is given interface module respectively, single chip control module and communication module power supply, interface module links to each other with the GPS receiver is two-way, described single chip control module is a single-chip microcomputer (U15), and interface module is an interface level conversion chip (U6).

2, the wireless data communication device of GNSS network differential correcting information according to claim 1 is characterized in that: the URXD1 end of described single-chip microcomputer (U15) is connected with 10 pin with 9 pin of interface level conversion chip (U6) respectively with the UTXD1 end.