Detailed explanation of the principle, structure and application of GPS navigation system

Detailed explanation of the principle, structure and application of GPS navigation system

GPS prospects and characteristics

Because of the all-weather, high-precision and automatic measurement characteristics of GPS technology, as advanced measurement methods and new productivity, it has been integrated into various application fields of national economic construction, national defense construction and social development.

With the end of the Cold War and the vigorous development of the global economy, the US government announced that from 2000 to 2006, under the premise of ensuring that the US national security is not threatened, the SA policy will be cancelled, and the accuracy of GPS civilian signals will be improved globally. / A code for single-point positioning accuracy increased from 100 meters to 10 meters, which will further promote the application of GPS technology, improve productivity, operating efficiency, scientific level and people's quality of life, and stimulate the growth of the GPS market. According to the prediction of relevant experts, in the United States, the car GPS navigation system alone will have a market of 3 billion US dollars after 2000, while in China, the market for car navigation will also reach 5 billion yuan. It can be seen that the application prospect of the GPS technology market is very impressive.

The main features of the global positioning system:

(1) Work globally and around the clock.

â‘ High positioning accuracy. Click positioning accuracy is better than 10m, using differential positioning, accuracy can reach centimeter level and millimeter level.

â‘¡Multiple functions and wide application.

The characteristics of GPS system: high precision, all-weather, high efficiency, multi-function, easy operation, and wide application.

1. High positioning accuracy

Application practice has proved that the relative positioning accuracy of GPS can reach 10-6 within 50KM, 100-7500KM can reach 10-7, and 1000KM can reach 10-9. In the precise positioning of the 300-1500M engineering, the plane position error of the plane observed for more than 1 hour is less than 1mm. Compared with the measured side length of the ME-5000 electromagnetic wave distance meter, the maximum side length difference is 0.5mm The median error is 0.3mm.

2. Short observation time

With the continuous improvement of the GPS system and the continuous updating of the software, at present, relative static positioning within 20KM takes only 15-20 minutes; during rapid static relative positioning measurement, when each mobile station is within 15KM from the reference station, the mobile The observation time of the station is only 1-2 minutes, and then it can be located at any time, and the observation of each station takes only a few seconds.

The main uses of the global positioning system: (1) land applications, mainly including vehicle navigation, emergency response, atmospheric physical observation, geophysical resource exploration, engineering survey, deformation monitoring, crustal movement monitoring, municipal planning control, etc .; (2) marine applications , Including the determination of the best voyage route of ocean-going ships, real-time dispatch and navigation of ships, marine rescue, ocean exploration, hydrogeological survey, positioning of offshore platforms, and monitoring of sea level rise and fall; Attitude control, low-orbit satellite orbit determination, missile guidance, aviation rescue and manned spacecraft protection detection, etc.

Control cable, insulated by PVC,XLPO/XLPE or PTFE material, is applicable for controlling and protecting circuits of rated voltage up to and including 450/750 V, used in enterprises of industrial and mining and department of energy source and transportation. It belongs to electrical equipments use cable which transmits electrical power from power system to various electrical equipments and tools.

Product specification

l  Conductor type: stranded 99.95% OFC(oxygen free copper)

l  Material :environmental friendly, fire resistant, flame retardant, low smoke halogen free, heat resistant

l  Control cable color: black or other customized color

l  Packing: carton packing, pallet packing, wooden steel drum or other packing method as requirements.


Three Main Type of our Control Cable

l  PVC Insulated sheathed control cable

l  Fire resistant control cable(PTFE)

l  Radiation XLPO insulated control cable

  control cables for electrical signalelectrical control cables

Using features

*Rated power-frequency rated voltage U0/U is 450/750V

*Max. permissible continuous operating temperature of conductor:

l  PVC Insulation type: 0℃

l  XLPE Insulation type:  90℃

l  PTFE Insulation type: 40℃~200℃

l  XLPO Insulation type: 125℃

*The ambient temperature under installation should not be lower than 0℃, if the ambient temperature is below 0℃,the cable should be preheated.



This cable is manufactured according to GB/T9330-2008 standard. It can also be manufactured according to other standards upon request.


Industrial and mining enterprises: iron and steel, coal manufacturing, etc

Modern high-rise building

Connecting line of electrical instruments and automation devices

 For laying indoors, in trenches and in ducts, the cable should be shielded and for fixed installation.

Notes for installation

1.   Don`t directly expose to the sunlight or superheat.

2.   Don`t forget to check dry and wet level for installations in trenches regularly.

We can manufacture control cables as customer`s requirements. Welcome to contact us for more details about products and price. If later you want to visit our factory to get close to our production line, please also feel free to get in touch with us.

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