CN202728142U

CN202728142U - Car-mounted terminal based on combined positioning technology

Info

Publication number: CN202728142U
Application number: CN 201220417406
Authority: CN
Inventors: 蒋屹; 蒋帆; 宋大鹏; 李娟�
Original assignee: Apx Science & Technology Development Co Ltd
Current assignee: Apx Science & Technology Development Co Ltd
Priority date: 2012-08-22
Filing date: 2012-08-22
Publication date: 2013-02-13
Anticipated expiration: 2022-08-22

Abstract

The utility model relates to a car-mounted terminal based on a combined positioning technology. The car-mounted terminal is composed of six parts including a singlechip, a GPS (Global Position System) module, an electronic compass, a wheel speed sensor, a GSM (Global System for Mobile Communications) module, a power source and a DC-DC (Direct Current-Direct Current) converter; the singlechip is respectively connected with the GPS module, the electronic compass and the wheel speed sensor; the GPS module is controlled by the singlechip to collect running position data of a car; a running angle of the car is obtained via the electronic compass; the running speed of the car is obtained via the wheel speed sensor; and data transmission is implemented by the GSM module via a wireless communication network. The car-mounted terminal can realize located monitoring via the sensor under the condition of loss of GPS signals so that the reliability of a system is improved; and meanwhile, the car-mounted terminal has the characteristics of being simple in structure, reliable in running, convenience to install, high in tracking precision, low in cost and the like.

Description

Car-mounted terminal based on combined orientation technology

Technical field

The utility model relates to a kind of car-mounted terminal, and is particularly a kind of based on GPS, GSM, GIS and the sensor technology car-mounted terminal in one.

Background technology

Vehicle and driver's management is the Focal point and difficult point of transport enterprise's daily management mission always, owing to executing the task, the driver is mostly away from unit, and the various complexity of working environment, this has brought very large difficulty with regard to the management of giving vehicle and driver.Present vehicle monitoring system, the speed of a motor vehicle error of calculating with GPS is larger, particularly larger at lower-speed state and the vehicle non-rectilinear time error that travels, and GPS is subjected to the impact of external environment condition larger, has signal blind zone, for example, near mountain area, skyscraper etc., the situation of signal interruption can appear in GPS, thereby loses the data of vehicle operating, and it is longer to reorientate required time, has affected the monitoring effect of vehicle.And the car speed that sensor obtains and position signal to be tach signal with wheel directly convert, therefore error is less, but because sensor exists in measurement and can't avoid accumulated error, grow distance, in the transfer data reliability that measures will be reduced greatly on a large scale at traffic unit.Therefore, we carry out monitoring and the scheduling of vehicle by the mode that vehicle GPS is combined with sensor technology, improve data reliability and real-time, the operation of supervision navigating mate, and the standard driving behavior, thus reach the purpose of preventing traffic accident.

The utility model content

The technical matters that (one) will solve

The technical problems to be solved in the utility model is the car-mounted terminal that proposes a kind of GPS of collection, GSM, GIS and sensor technology.

(2) technical scheme

For solving the problems of the technologies described above, the utility model provides a kind of car-mounted terminal, formed by 6 parts: micro controller system, GPS module, electronic compass, wheel speed sensors, gsm module, power supply and DC-DC conv, micro controller system links to each other with GPS module, electronic compass and wheel speed sensors respectively, by Single-chip Controlling GPS module the Vehicle Driving Cycle position data is gathered, know the Vehicle Driving Cycle angle by electronic compass, obtain Vehicle Speed by wheel speed sensors, realize that by wireless communication networks data transmit by gsm module.Wheel speed sensors is the Hall wheel speed sensors.

(3) beneficial effect

This car-mounted terminal integrates GPS, GSM, GIS and sensor technology, can be implemented in the situation that gps signal loses, and realizes locating and monitoring by sensor, has improved the reliability of system; Have simultaneously simple in structure, reliable, easy for installation, tracking accuracy is high, the characteristics such as with low cost.

Description of drawings

Fig. 1 is the car-mounted terminal constructional drawing;

Fig. 2 is the car-mounted terminal circuit connection diagram;

The specific embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present utility model is described in further detail.Following examples are used for explanation the utility model, but are not used for limiting scope of the present utility model.

Car-mounted terminal is comprised of 6 parts: micro controller system, GPS module, electronic compass, wheel speed sensors, gsm module, power supply and DC-DC conv.This 6 partial circuit is carried out logic to be connected and is installed on the driving vehicle, by Single-chip Controlling GPS module the Vehicle Driving Cycle position data is gathered, know the Vehicle Driving Cycle angle by electronic compass again, obtain Vehicle Speed by wheel speed sensors again, at last with the gps data that collects, the angle of travelling, moving velocity, by wireless communication networks data are sent back the host side of control center by the GSM communication module, finish data acquisition and the monitoring of a circulation.The car-mounted terminal hardware block diagram as shown in Figure 1.

This car-mounted terminal will be used serial communication, more the ROM of I/O port and larger capacity and RAM and stronger signal handling capacity.We select the AT89C51 of American ATMEL production as our central process unit; Contact in order between moving vehicle and monitoring and control centre, to set up radio communication, used a cover radio communication terminal-SIEMENSTC35I.It is the GSM terminal with SIM card reader, FME antenna connector, mouthpiece interface, standard RS-232 interface take TC35GSM module (double frequency EGSM900/GSM1800) as core.We have mainly used electronic compass and Hall wheel speed sensors sensor.We use electronic compass is the WJ-SDC-102 model, and it is a low-cost flat digital compass module, and input voltage is low, and power is little, and volume is little.The Hall wheel speed sensors is selected Hall switch sensor, model A04E, and it is cheap, and circuit is fairly simple.Power supply voltage is+5V, outgoing level and Transistor-Transistor Logic level coupling, can with the micro controller system direct interface.

Data between computing machine and the terminal transmit can adopt serial communication and parallel communication dual mode.Because serial communication mode has and uses that circuit is few, cost is low, particularly when remote transmission, avoided the inconsistent of many line characteristics and be widely adopted.When serial communication, require communication two party all to adopt a standard interface, different equipment can be coupled together easily carry out communication.RS-232 interface (claiming again EIA RS-232-C) is present the most frequently used a kind of serial communication interface.It is by the common standard that is used for serial communication of formulating of EIA (EIA) associating Bell System, modem producer and terminal manufacturer in 1970.

In micro controller system, mainly use asynchronous communication mode.The serial communication of full duplex only needs an output line and an input line.The output of data claims again to send data (TXD), and the input of data claims again receive data (RXD).The employed single chip computer AT 89C51 of the system that considers only provides a hardware full-duplex serial interface, and micro controller system decides the order of each paths time-sharing work by multidiameter option switch.Its X side is selected sendaisle, Y side selective reception passage, and A and B end by P1.2 and the P1.3 of AT89C51 receives CD4052 send the selection signal in order, are that sendaisle and receiving cable are connected one to one.The direct P3.4 of being connected with micro controller system of Hall element connects.The concrete scheme drawing that connects as shown in Figure 2.

Electronic compass WJ-SDC-102 is a kind of modular sensor, its intrinsic CPU processes locating data automatically, output is digital signal and can directly enters treater, consider that just RS-232 comes the presentation logic state with generating positive and negative voltage, it comes the regulation of presentation logic state different from TTL with high-low level, TC35I also is the RS-232 level simultaneously, therefore, WJ-SDC-102 is connected with TC35I and can be connected with micro controller system TTL circuit, must between RS-232 and TTL circuit, carry out the conversion of level and logical relation, used novel RS-232 conversion chip MAX232 in the native system, the MAX232 chip can be realized the conversion of Transistor-Transistor Logic level and RS-232 bidirectional level, and there are voltage multiplying circuit and change-over circuit in inside, and only need+5V power supply just can be worked, and is very easy to use.

Above embodiment only is used for explanation the utility model; and be not limitation of the utility model; the those of ordinary skill in relevant technologies field; in the situation that does not break away from spirit and scope of the present utility model; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.

Claims

1. car-mounted terminal, formed by 6 parts: micro controller system, GPS module, electronic compass, wheel speed sensors, gsm module, power supply and DC-DC conv, it is characterized in that: micro controller system links to each other with GPS module, electronic compass and wheel speed sensors respectively, by Single-chip Controlling GPS module the Vehicle Driving Cycle position data is gathered, know the Vehicle Driving Cycle angle by electronic compass, obtain Vehicle Speed by wheel speed sensors, realize that by wireless communication networks data transmit by gsm module.

2. car-mounted terminal according to claim 1, it is characterized in that: wheel speed sensors is the Hall wheel speed sensors.