Geely EC718, EC718RV, EC715, EC715RV. Manual part — 381

11.3 Navigation

11.3.1 Specifications
11.3.1.1 Fastener Tightening Specifications

Applications

Model

Specifications

Metric(Nm)

US English(lb-ft)

Navigation Control Retaining Bolts

M6 × 20

8-11

6-8

GPS Antenna Self-Tapping Screws

ST4.2 × 16

3-4

2-3

Rear Speaker Self-Tapping Screws

ST4.8 × 9.5

3-4

2-3

Front Door Tweeters Self-Tapping Screws

ST4.2 × 9.5

3-4

2-3

Radio Antenna System Bolts (Sedan)

M6 × 16

8-11

6-8

Body Electric

Navigation

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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.

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Navigation

Body Electric

This system supports regular music CD, MP3 CD. When the
CD/MP3 is inserted, it will automatically start playing, the
display shows CD/MP3 status, including "track number",
"progress bar," and other information. (When you insert a MP3
disc, the machine will detect the MP3 disc, the screen will
switch to the MP3 screen display. When playing MP3 disc, the
track name and artist information will also be displayed on the
screen).

3. SD Functions

Note

This system supports dedicated cards: If MP3/WMA
format file is copied on the SD card with map files, the
system does not recognize the corresponding audio
files, only when the MP3/WMA format files are copied on
other non-loaded SD card, the system will play the
music.

The system supports MP3/WMA format audio file playback.
When a SD card with MP3/WMA files is inserted, press [SD]
key, the system starts playing the audio files on the SD card,
the display shows SD status, including "track name", "Artist
Information", "progress bar", etc.

4. DVD Functions

When the DVD disc is inserted, the system will play DVD after
reading the menu.

Body Electric

Navigation

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11.3.3 System Working Principle
11.3.3.1 Navigation System Principle Diagram

Antenna

Amplifier

Frequency Modifier

Vehicle Speed Sensor

Vehicle Speed Signal

Measure Calculate

Check Confirm

Calculate Vehicle
Current Position

Sensor

Calculate Direction Change

Map Matching

Map Database

Microprocessor

Display

Voice Output

Receiver

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11.3.3.2 GPS System Positioning Principle

GPS system is used to determine the user's exact location on
Earth. each satellite rotate around the Earth two laps every day,
so at any location on Earth, four or more satellites signals can
be received at the same time. the computer can calculate the
user current location in Earth coordinates (longitude, latitude).
After the receiver receives these signals, it calculates the
current three-dimensional position, three-dimensional direction
and velocity and time information. GPS receivers are usually
used for pseudo-range measurements, carrier phase
measurements, satellite radio interferometry, Doppler
measurements and other measurements.

x

y

z

(x1、y1、z1)

(x2、y2、z2)

(x3、y3、z3)

(x4、y4、z4)

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Navigation

Body Electric