Infiniti G35 (V35). Manual — part 131
ANTENNA
AV-39
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AV
TEL ANTENNA
Window Antenna Repair
NKS002FP
ELEMENT CHECK
1.
Attach probe circuit tester (ohm setting) to antenna terminal on
each side.
●
When measuring continuity, wrap tin foil around the top
of probe. Then, press the foil against the wire with finger.
SKIB7574E
SEL250I
SEL122R
AV-40
ANTENNA
2.
If an element is broken, no continuity will exist.
3.
To locate a break, move probe along element. Tester needle will
swing abruptly when probe passes the broken point.
ELEMENT REPAIR
Refer to
SEL252I
SEL253I
NAVIGATION SYSTEM
AV-41
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AV
NAVIGATION SYSTEM
PFP:25915
System Description
NKS002FQ
The navigation system periodically calculates the vehicle's current
position according to the following three signals: Travel distance of
the vehicle as determined by the vehicle speed sensor, turning angle
of the vehicle as determined by the gyroscope (angular velocity sen-
sor), and the direction of vehicle travel as 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 read from the map DVD-
ROM, which is stored in the DVD-ROM drive (map-matching), and
indicated on the screen as a current-location mark.
My accurate data is judged and used by comparing vehicle position
detection results found by the GPS with the result by map-matching.
The current vehicle position will be calculated by detecting the dis-
tance the vehicle moved from the previous calculation point and its
direction.
TRAVEL DISTANCE
Travel distance calculations are based on the vehicle speed sensor input signal. Therefore, the calculation
may become incorrect as the tires wear down. To prevent this, an automatic distance fine adjustment function
has been adopted.
TRAVEL DIRECTION
Change in the travel direction of the vehicle is calculated by a gyroscope (angular velocity sensor) and a GPS
antenna (GPS information). As the gyroscope and GPS antenna have both merit and demerit, input signals
from them 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 is a function that repositions the vehicle on the road
map when a new location is judged to be the most accurate. This is
done by comparing the current vehicle position, calculated by the
method described in the position detection principle, with the road
map data around the vehicle, read from the map DVD-ROM stored in
the DVD-ROM drive.
In the following cases, the vehicle position may not be corrected
after the vehicle is driven over a certain distance or time in which
GPS information is hard to receive. In this case, the current-location
mark on the display must be corrected manually.
CAUTION:
The road map data is based on data stored in the map DVD-
ROM.
SKIA0370E
SEL684V
Type
Advantage
Disadvantage
Gyroscope
(angular velocity sensor)
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Can detect the vehicle's turning angle quite
accurately.
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Direction errors may accumulate when the vehicle
is driven for long distances without stopping.
GPS antenna
(GPS information)
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Can detect the vehicle's travel direction (North/
South/East/West).
●
Correct direction cannot be detected when the
vehicle speed is low.
SEL685V
AV-42
NAVIGATION SYSTEM
●
In map-matching, alternative routes are prepared and prioritized
in addition to the road judged currently driven. Due to the dis-
tance and/or direction error, the incorrect road may be prioritized
and current location mark may be repositioned to the wrong
road.
When two roads are running in parallel, they are judged to the
same priority. Therefore, the current-location mark may appear
on either of them alternately, depending on maneuvering of the
steering wheel and configuration of the road.
●
Map-matching does not function correctly when the road on
which the vehicle is driving is new and not recorded in the map
DVD-ROM, or when the road pattern stored in the map data and
the actual road pattern are different due to repair.
When driving on a road not present in the map, the map-match-
ing function may find another road and position the current-loca-
tion mark on it. Then, when the correct road is detected, the
current-location mark may leap to it.
●
Effective range for comparing the vehicle position and travel
direction calculated by the distance and direction with the road
data read from the map DVD-ROM is limited. Therefore, when
there is an excessive gap between the current vehicle position
and the position on the map, correction by map-matching is not possible.
GPS (GLOBAL POSITIONING SYSTEM)
GPS (Global Positioning System) has been developed and con-
trolled by the US Department of Defense. The system utilizes GPS
satellite (NAVSTAR), sending out radio waves while flying on an orbit
around the earth at the height of approx. 21,000 km (13,000 miles).
The GPS receiver calculates the vehicle's position in three dimen-
sions (latitude/longitude/altitude) according to the time lag of the
radio waves received from four or more GPS satellites (three-dimen-
sional positioning). If radio waves were received only from three
GPS satellites, the GPS receiver calculates the vehicle's position in
two dimensions (latitude/longitude), utilizing the altitude data calcu-
lated previously by using radio waves from four or more GPS satel-
lites (two-dimensional positioning).
Accuracy of the GPS will deteriorate under the following conditions.
●
In two-dimensional positioning, the GPS accuracy will deteriorate when the altitude of the vehicle position
changes.
●
There may be an error of approximately 10 m (30 ft) in position detected by three-dimensional positioning,
which is more accurate than two-dimensional positioning. The accuracy can be even lower depending on
the arrangement of the GPS satellites utilized for the positioning.
●
Position detection is not possible when the vehicle is in an area where radio waves from the GPS satellite
do not reach, such as in a tunnel, parking lot in a building, and under an elevated highway. Radio waves
from the GPS satellites may not be received when some object is located over the GPS antenna.
●
Position correction by GPS is not available while the vehicle is stopped.
SEL686V
SKIA0613E
SEL526V
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