Infiniti EX35. Manual - part 169

 

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Infiniti EX35. Manual - part 169

 

 

AV

AUDIO SYSTEM

AV-457

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

C

D

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STEERING SWITCH

• Each audio operation can be operated.
• Steering switch signal (operation signal) is output to AV control unit.

MICROPHONE

• It is used for voice activated operation
• Pronounced voice is converted to voice signal and transmitted to AV control 

unit.

ANTENNA AMP.

• Radio signal received by rod antenna is amplified and transmitted to AV control 

unit.

• Power (antenna amp ON. signal) is supplied from AV control unit.

SATELLITE RADIO ANTENNA

Audio signal (satellite radio) is received and output to AV control unit.

iPod ADAPTER

• Inputs iPod sound signal from iPod

®

, and outputs iPod sound signal to AV con-

trol unit.

• Receiving/transmitting of iPod

®

 operation signals are performed as follows:

- between AV control unit and iPod adapter: AV communication.

- between iPod

®

 and iPod adapter: serial communication.

Part name

Description

AV-458

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

NAVIGATION SYSTEM

NAVIGATION SYSTEM

System Diagram

INFOID:0000000003160607

System Description

INFOID:0000000003515971

DESCRIPTION

• AV control unit controls navigation function while GPS tuner has built-in map data, GYRO (angle speed sen-

sor), on the HDD (Hard Disk Drive).

• AV control unit inputs operation signals with communication signals, through display (touch panel), multi-

function switch and steering switch.

• Guide sound is output to front speaker through BOSE amp. from AV control unit when operating navigation

system.

• The vehicle position is calculated through the GYRO (angle speed sensor), vehicle sensor, signal from GPS

satellite and map data stored on HDD (Hard Disk Drive), and transmits the map image signal (RGB image,
RGB area, RGB image synchronizing) to display.

POSITION DETECTION PRINCIPLE

The navigation system periodically calculates the current vehicle
position according to the following three types of signals.
• Travel distance of the vehicle as determined by the vehicle speed

sensor

• Vehicle turning angle determined by the gyroscope (angular speed

sensor) 

• The travel direction of the vehicle determined by the GPS antenna

(GPS information)

The current position of the vehicle is then identified by comparing the
calculated vehicle position with map data, which is stored in the HDD
(Hard Disk Drive) (map-matching), and indicated on the screen with
the current location mark. More accurate data is used by comparing
position detection results from GPS to map-matching.
The current position is calculated by detecting the travel distance
from the previous calculation point, and its direction change.
• Travel distance

The travel distance is generated from the vehicle speed sensor
input signal. The automatic distance correction function is adopted
for preventing a miss-detection of the travel distance because of
tire wear etc.

• Travel direction

The gyroscope (angular velocity sensor) and GPS antenna (GPS
information) detect a change in travel direction. Both have advan-
tages and disadvantages as per the following descriptions.

JSNIA0773GB

JSNIA0177GB

SEL684V

AV

NAVIGATION SYSTEM

AV-459

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

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Input signals are prioritized in each situation. However, this order of priority may change in accordance with
more detailed travel conditions so that the travel direction is detected more accurately.

MAP-MATCHING

Map-matching repositions the vehicle on the road map when a new
location is judged to be more accurate. This is done by comparing
the current vehicle position (calculated by the normal position detec-
tion method) from the map data stored in the HDD (Hard Disk Drive).

There is a possibility that the vehicle position may not be corrected in the following case, or when vehicle is
driven over a certain distance or time in which GPS information is hard to receive. Manually correct the current
location mark on the screen.
• In map-matching, several alternative routes are prepared and pri-

oritized in addition to the road detected as currently being driven
on.
Therefore, due to errors in the distance and/or direction, an incor-
rect road may be prioritized, and the current location mark may be
repositioned to the incorrect road.
If two roads are running parallel, they are of the same priority.
Therefore, the current location mark may appear on either of them
alternately, depending on steering wheel movement and road con-
figuration, etc.

• Map-matching does not function correctly when road that the vehi-

cle is driving on new, etc, or not recorded in the map data. Also,
map-matching does not function correctly when road patterns
stored in the map data and the actual road pattern are different due
to repair, etc.
Therefore, the map-matching function judges an other road as cur-
rently being driven on road if the road is not on the map, and dis-
plays the current location mark on it. Later, the current location
mark may be repositioned if the correct road is detected.

• Effective range for comparing the vehicle position and travel direc-

tion calculated by the distance and direction with the road data is
limited. Therefore, correction by map-matching is not possible
when there is an excessive gap between current vehicle position and the position on the map.

GPS (GLOBAL POSITIONING SYSTEM)

Type

Advantage

Disadvantage

Gyroscope (angular velocity 
sensor)

The turning angle is precisely detected.

Errors are accumulated when driving a long dis-
tance without stopping.

GPS antenna (GPS informa-
tion)

The travel direction (North/South/East/West) 
is detected.

The travel direction is not precisely detected when 
driving slowly.

SEL685V

SEL686V

JSNIA0180GB

AV-460

< FUNCTION DIAGNOSIS >

[BOSE AUDIO WITH NAVIGATION]

NAVIGATION SYSTEM

GPS (Global Positioning System) is developed for and is controlled
by the US Department of Defense. The system utilizes GPS satel-
lites (NAVSTAR), transmitting out radio waves while flying on an orbit
around the earth at an altitude of approximately 21,000 km (13,048
mile).
The receiver calculates the travel position in three dimensions (lati-
tude/longitude/altitude) according to the time lag of the radio waves
that four or more GPS satellites transmit (three-dimensional position-
ing). The GPS receiver calculates the travel position in two dimen-
sions (latitude/longitude) with the previous altitude data if the GPS
receiver receives only three radio waves (two-dimensional position-
ing). GPS position correction is not performed while the vehicle is
stopped.

Accuracy of the GPS will deteriorate under the following conditions:
• In two-dimensional positioning, GPS accuracy will deteriorate when altitude of the vehicle position changes.
• The position of GPS satellite affects GPS detection precision. The position detection may not be precisely

performed.

• The position detection is not performed if GPS receiver does not receive radio waves from GPS satellites.

(Inside a tunnel, parking in a building, under an elevated highway etc.) GPS receiver may not receive radio
waves from GPS satellites if any object is placed on the GPS antenna.

NOTE:
• The detection result has an error of approximately 10 m (32.8 ft) even with a high-precision three dimen-

sional positioning.

• There may be cases when the accuracy is lowered and radio waves are stopped intentionally because the

GPS satellite signal is controlled by the US trace control center.

SEL526V

 

 

 

 

 

 

 

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