Based on the GPSOne valuables tracking system terminal design (1)

Introduction

The Consumer Council on current problems in the freight forwarding industry conducted a survey of consumers entrust transportation of valuable goods lost in transit, causing serious damage to the amount of consumers is increasing.

Logistics companies often assume the task of transporting valuables, valuables of loss will result in the loss of their huge. Logistics companies using traditional GPS tracking valuables, you can reduce the chances of lost items. But under the viaduct or urban built-up and other complex geographic environment, easily lost satellite signals; and in the entire goods during transport, valuables in goods of metal containers or kept indoors, using GPS technology also could not get satellite positioning signals, it is difficult to achieve an effective tracking valuables. At the same time, the logistics company monitoring system of traditional solutions, GPS positioning business is GSM or CDMA mobile network SMS as communication media, positioning and alarm messages via cell phone text message sent to end users, and therefore not easy to logistics companies on the entire system for real-time monitoring, and management.

To meet the logistics company tracking valuables of urgent need, this article proposes a set of technologies based on GPSOne solution.

The programme is capable of a wide variety of environments in real-time, accurate positioning and events in the event of theft by Internet timely alarm, convenient for logistics company real-time monitoring, and management, enabling you to more effectively prevent items missing, and accountable.

1 positioning system

Use the positioning of CDMA DTGS-800 module is a good logistics tracking management programmes.

This module is based on the GPSOne technology, not only can achieve positioning, and built-in TCP/IP protocol stack, can easily transfer data to the Inter-net for easy monitoring and management of logistics companies.

GPSOne is a A-GPS (Assisted Global, complemented by PositionSystem GPS) and CDMA triangulation with hybrid positioning technology.

The combination of the two positioning technology complement each other. Away from the city's suburban and rural areas, CDMA triangle location technology for the wireless base station less scarce and precision, but those parts of the satellite signal strong, can take full advantage of the location information provided by A-GPS for precise positioning; in the downtown area, a large shopping mall, offices, and other high-rise buildings-intensive local or indoor, satellite signal is weak, no A-GPS positioning, but these areas more intensive CD-MA base station, you can use AFLT (Advanced Forward LinkTrilateration, senior forward link triangulation method) technology to overcome the shortcomings of positioning blind A-GPS, precise positioning.

At the same time, DTGS-800 module is machine card separation technology, as long as an open Internet and R-UIM card GPSOne location capabilities, and then insert the module to access the Internet and positioning services.

DTGS-800 module comes with TCP/IP protocol stack, with only a single command to the appropriate module, the module can automatically wirelessly using the TCP protocol to connect to the Internet. For connection, set the connection's IP address and port number to monitor backend server IP address and port number, you can implement Internet data transmission capabilities. Monitoring server, open the appropriate software to receive this information and then saved to the database, using GIS (Geographic Information System, GIS) to achieve real-time tracking and logistics location of vehicles and goods, and other functions, to facilitate the logistics company real-time monitoring and management. The entire positioning system as shown in Figure 1.

Positioning system including positioning Terminal, CDMA network, satellite systems and logistics company monitoring platform 4 sections.

Satellite positioning terminal or CD-MA base station Gets the current time, latitude and longitude information, send via CDMA network to the Internet, the logistics company monitoring platform uses software to receive the appropriate information from the Internet. As long as R-UIM card opened the GPSOne location CD-MA and Internet capabilities to obtain CDMA networks and satellite system of corresponding services. The data transmission process can be considered as transparent transmission, can be thought of as data is sent directly from the location of the Terminal to the logistics company monitoring platform.

The entire system works as follows: DTGS-800 module, limit switch, antennas and other auxiliary circuit packaged as an independent unit made of positioning terminals, fixed to the storage of goods in containers out of the box.

During transport, when the container seals intact and functioning transport, the location of the terminal can be scheduled to monitoring platform to send information such as latitude and longitude, time; and when the container is opened non-normal will touch on the limit switch, the location of the terminal will prompt to send alarm information monitoring platform and location information. Logistics company through monitoring platform to receive this information, combined with the logistic scheduling tables, analysis of the situation at the time of the incident, to logistics determine whether an exception occurs, and timely processing, delivering logistics process tracking, security, query, and management, real-time monitoring capabilities.

2 system hardware design

Positioning Terminal hardware overall block diagram shown in Figure 2.

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