Geely EC715 2009, Workshop Manual

Page: 1522 / 2181

11.3.2 Description and Operation
11.3.2.1 Overview
Vehicle navigation system consists of a GPS receiver, self-
navigation device, speed sensors, gyro sensors, LCD monitor
etc.. GPS is "Global Positioning System" acronym, the Global
Positioning System, which is the U.S. research and
development for military purposes. Its means using navigation
satellites to measure time and distance, and form a global
navigation system.
This vehicle navigation system uses current advanced design
approach: navigation display screen, navigation ECU, radio,
DVD are integrated in one. Map database uses SD card
storage technology, previously using CD-ROM map to store
database. Using SD cards as map data storage is faster than
using CD-ROM. Without the CD-ROM player, its structure is
simpler, so the failure chances are greatly reduced. When a
new navigation map database needs to be updated, simply use
the computer to update the SD card data. To update the
traditional map data stored on CD-ROM, the only way is to
replace the CD-ROM.
Vehicle navigation have the following main functions:
– Be able to retrieve the best route to the destination;
– With instantaneous re-search function;
– Provide an abundance set menu and records to facilitate
the search;
– Provide real-time voice prompts at appropriate times;
– Function expansions.
11.3.2.2 GPS System Introduction
GPS consists of the space segment, ground control segment,
the user device.
Space Segment:
It includes 21 satellites and three spare satellites, like a
constellation, placed in the air 20,000 km away from the Earth.
Evenly distributed in the orbit angle 55 ° in six orbital planes,
different orbital planes form a 60 ° angle, four satellites are
distributed on each orbit. The distribution structure ensures that
at any location in the world, one can refer to at least four
satellites.
1
6
8
17
20
21
15
5 10
11
9
14
7
2
4
13
16
18
12
19
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Ground Control Segment:
For navigation and positioning, firstly the satellite location must
be known. The satellite position is derived from calculations
based on the satellite movement and its orbital parameters.
Ground monitoring station continuously monitors each satellite
for many years. According to the satellite observed parameters
adjust the satellite orbit to amend the satellite positioning.
When one satellite fails, a spare satellite can replace the failed
satellite.
User Receiver System:
User receiver system includes a power supply, antenna,
receiver, microprocessor, control display devices such as
hardware and software, data processing software package and
so on.
11.3.2.3 Function Expansion Introduction
1. Radio Functions
Same as an ordinary radio, this system radio has radio
receiving capabilities, and it can store 30 radio stations. When
disconnecting the battery negative cable, the stored list of all
the radio stations with all information will be cleared.
2. CD/MP3 Functions
Note
If an already inserted disc does not pop up, inserting the
second disc may damage the CD / DVD drive. Insert
adisc after the disc ejected from the CD/DVD drive.
11-38 Navigation Body Electric
EC718/EC718RV EC715/EC715RV 10/2009