Analysis of the application of the hottest logisti

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Logistics application analysis of science and Technology (VI)

(V) satellite positioning cargo tracking system

the global positioning system (GPS) of the U.S. Department of defense, GLONASS of Russia, INMARSAT of the international maritime satellite organization provide satellite positioning services, among which GPS is the earliest developed and provided for civilian use. GPS is composed of twenty-four satellites (three of which are standby) with six orbits located at 202 kilometers above the earth, which is not surprising. It carries out all-round real-time three-dimensional navigation and positioning at sea, land and air. GPS includes three parts: space satellite group, ground monitoring system and user equipment

1. The space satellite group

twenty four satellites are evenly distributed in six orbits. There are four satellites in each orbit. The satellites orbit the earth for about twelve hours. At any time, the signals of four to eight satellites can be received on the ground, up to 12 satellites, and more than six satellite signals can be received on average. Twenty one satellites can cover the surface of the earth seamlessly

2. The ground monitoring system

includes a master control station (located at the U.S. Colorado Falcon Air Force Base), five monitoring stations (located at Hawaii, kwajaiein, association Island, Diego Garcia, Colorado Springs), and three ground antennas (kwajaiein, association Island, Diego Garcia), which are responsible for tracking the satellite's operating position, time, meteorological and ionospheric data, and calculating the observed data every 15 seconds, It is transmitted to the master computer for comprehensive analysis, and then converted into longitude, latitude, speed and other positioning information

3. User equipment

user satellite receiver, receives satellite signals for positioning calculation, and uses electronic map to visually display the accurate position of ground moving targets. Electronic map digitises ordinary map, terrain, ground objects, etc., also known as digital map. It is a necessary map for positioning, navigation system, information center and control center of individuals, vehicles, crowd control, etc. Most maps are vector maps, which can be infinitely enlarged, reduced, managed in blocks, moved freely, and the integrity of place names can be maintained. It has the function of graphic and text mutual check, that is, input the adjustable map of street name, and click the road to display its road name

gps system generally has the following functions

1 Stepless zoom in and zoom out of the map

2. Arbitrary translation and switching of the map

3. Display mode optional

4. Arbitrary call of layers

5. Graphics

6. Selection of monitoring mode

7. Query of various information (Geographic target information, vehicle information, etc.)

8 Monitor vehicle selection reception

9. Various data statistics and management

10. Various operation help

11. Setting and rehearsal of various emergency plans (providing convenience for command and dispatching)

12. Reproduction of vehicle running track

13. The driving route is preset. If the vehicle deviates, a prompt can be sent

14 Statistics and analysis of various driving records

15. The selection of the shortest path and the best path

16. Alarm receiving and handling management

during the Gulf War, U.S. soldiers and vehicles were equipped with handheld and vehicle GPS user equipment. Therefore, facing the endless desert, GPS can still fully grasp the dynamics of the troops and quickly win this high-tech local war, which is indispensable. GPS has a wide range of applications. In addition to logistics cargo tracking, it can also be used for positioning and navigation of individuals in field operations, ship positioning and navigation, military and police crowd control, government and civil anti-theft, preservation, tracking, disaster relief, etc

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