Part 1
Navigation System
Navigation System Component Location (Except Japan)
Navigation System Component Location (Japan Only)
Introduction to the Global Positioning System (GPS)
The system used to calculate the current position of the vehicle is called the GPS (global positioning system). The system utilizes satellites which are owned by the United States Department of Defense (DoD). A total of 24 satellites circular orbit the earth every 12 hours at a height of 20,000 km (12500 miles), and between 5 and 11 of these satellites can be seen from a single point at any given time. The orbits are tilted to the earth's equator by 55 degrees to ensure coverage of polar regions. Each satellite transmits radio signals to provide information about the satellite position i.e. latitude, longitude, altitude, almanac data and an accurate time signal generated by an on-board atomic clock. Each satellite contains four atomic clocks
The vehicle needs to receive data from at least four different satellites to give a three dimensional fix on its current position.
As the vehicle moves, this information is continually being updated. The computer determines which satellites are 'visible' to the system and their current position and relationship to each other. Using this information the computer can account for positional deviations of the satellites and compensate to enhance the accuracy of the navigation system.
The GPS (global positioning system) signal is also known as the Precision Positioning Signal (PPS). PPS predictable accuracy is:
^ 22 meters horizontal accuracy
^ 27.7 meters vertical accuracy
^ 200 nanosecond time accuracy.
The system uses almanac data to determine the vehicles position. Almanac data is the current status of the 24 satellites which orbit the earth. The computer determines which satellites are 'visible' to the system and their current position and relationship to each other. Using this information the computer can account for positional deviations of the satellites and compensate to enhance the accuracy of the navigation system. The navigation system requires the almanac data from at least four different satellites to calculate a three dimensional 'fix' on its location. As the vehicle moves the computer continually up dates this information s-that at all times the computer knows the precise location of the vehicle.
On Road Navigation System
The navigation system provides on road navigation capabilities. On road navigation requires a DVD (digital versatile disc) based map to be inserted in the navigation computer. One map disc is supplied with the vehicle, subsequent updated discs can be obtained from Land Rover dealer-ships at additional cost.
General
The navigation system provides computer generated audible and visual route guidance information to enable the driver to reach a desired destination. The system allows the driver to choose the desired route using minor or major roads or motorways and the quickest or shortest route. Directions to hospitals, museums, monuments and hotels are also available. The computer uses map information stored on a DVD (digital versatile disc) -ROM to determine the best route for the journey and provide the driver with details of directions and approaching junctions.
The Range Rover navigation system is a MOST based system. The navigation system provide on-road and off-road navigation capabilities with a DVD (digital versatile disc) based map system. The navigation system has the following advantages over a conventional CD based system:
^ High speed scrolling display and route searching
^ Single DVD (digital versatile disc) can contain all map data, e.g. only one DVD (digital versatile disc) required for the USA
^ Greater geographic coverage than a CD (compact disc) system
^ Touch screen display
^ Allows for multi-destination input
^ Large points of interest library, e.g. tourist attractions, petrol stations, etc.
^ 3 dimensional map display show terrain data, land contours and buildings
^ Voice operation
^ 800 X 600 high resolution screen
^ Display time and distance to destination.
The system comprises the following components:
^ Touch Screen Display (TSD)
^ Navigation computer
^ GPS (global positioning system) antenna
^ Traffic Message Channel (TMC) receiver (Except Japan)
^ TMC antenna amplifier (Except Japan)
^ Vehicle Information and Communication Systems (VICS) receiver (Japan only)
^ VICS beacon antenna (Japan only)
^ Integrated Head Unit (IHU)
^ Microphone
All vehicles with navigation feature voice recognition and Traffic Message Channel (TMC) (Europe and NAS markets only) or Vehicle Information and Communication Systems (VICS) (Japan only). Enhanced navigation includes on road and off road navigation functionality.
Navigation System Components
The navigation system comprises a number of dedicated components and interaction with other vehicle systems to obtain the navigational functionality. The following describes the additional components used in the navigation system.
Touch Screen Display
The Touch Screen Display (TSD) is located in the center of the instrument panel and is the driver control interface for the navigation system. The TSD is connected to the MOST ring and communicates with the other components in the audio/infotainment system.
The TSD communicates with the navigation computer on a dedicated serial link known as Gigabit Video Interface (GVIF) and provides the driver interface and driver display of the navigation system. The TSD processes its own video for system operation but receives the navigation graphics from the navigation computer on the GVIF serial link.
The TSD also provides driver display and control of the audio system, telephone, the rear view camera, the Venture Cam, the Traffic Message Channel and the rear seat entertainment.
The navigation system and other systems are operated by a combination of the physical buttons located on each side of the screen and the 'virtual' buttons displayed on the touch screen. For clarification, the physical buttons are referred to as 'buttons' and the touch screen virtual buttons are referred to as 'icons'.
The TSD is a touch sensitive, 800 X 600 pixels LCD (liquid crystal display) VGA screen which displays in a 15:9 format.
Care should be taken with the TSD to ensure its correct operation:
^ The screen should be cleaned with a lightly, water moistened cloth. D-not use chemical agents or domestic products to clean the screen or any part of the surround.
^ Only use your finger to operate the touch screen. Ensure you only use one finger to avoid incorrect entries.
^ A short light press of the touch screen is sufficient. Excessive pressure can damage the screen.
Refer to the Audio section for details of the harness connectors related to the TSD.
Navigation Computer
CAUTION: If the navigation computer is disconnected before the Infotainment System has powered down, the computer could fail to complete its data storage. This means that personal settings could be lost.
The navigation computer is located in the left hand rear corner of the luggage compartment. The navigation computer is a DVD (digital versatile disc) based unit which allows for a greater capacity of data to be stored on the map disc when compared to previous CD (compact disc) based units. The navigation computer incorporates a GPS (global positioning system) receiver, a Piezo gyro sensor and the voice recognition software and receives inputs from the ABS (anti-lock brake system) control module and the GPS (global positioning system) antenna.
The navigation computer contains a solid state piezo gyro which measures the motion of the vehicle around its vertical axis. The gyro operates on the principle known as the Coriolis force. The Coriolis force is the force that appears to accelerate a body moving away from its rotational axis against the direction of rotation of the axis.
Using the inputs from the ABS (anti-lock brake system) module, the GPS (global positioning system) antenna and the gyro sensor, the computer calculates the vehicle's current position, direction and speed.
The navigation computer houses the DVD (digital versatile disc) -ROM drive. The drive is used to read map data from region specific DVD (digital versatile disc) 's (1 DVD (digital versatile disc) for each of the following regions: EU, US, Japan and Australia). A button, located adjacent to the DVD (digital versatile disc) slot, is provided to eject the DVD (digital versatile disc) from the unit. If the ignition is on, or the Entertainment System is in 1-hour mode, one press of the button will eject the DVD (digital versatile disc).
The GPS (global positioning system) receiver receives information from between 1 and 8 satellites at any one time. This information is received from the GPS (global positioning system) antenna. The built in GPS (global positioning system) receiver is used for calculating the position (i.e. Latitude, longitude and height), direction and speed.
The navigation computer uses non-volatile memory to store settings and configuration information when it is powered down. This process takes place just before the computer turns off.
The navigation computer is connected to the TSD by a private CAN (controller area network) bus and a GVIF serial link. The GVIF serial link carries all video information from the navigation computer to the TSD. The CAN (controller area network) bus carries data and control instructions to and from the TSD.
Three connectors provide the interface between the navigation computer, the TSD and the GPS (global positioning system) antenna and the VICS receiver. The TMC receiver is connected on the MOST ring.
For the Japanese market the navigation computer is a different component. Although it looks identical the software is specific to Japan market and the part number is different. The system also has extra components for the VICS system (a receiver and an antenna). The VICS system receiver allows the vehicle to receive information about traffic conditions from roadside transmitters and adjust the navigation instructions accordingly. The VICS information is received by both a radio link and an infra red link. For this reason a VICS beacon antenna is located on the inside of the windscreen.
GPS (global positioning system) Antenna
Roof Pod
The GPS (global positioning system) antenna is located in the roof pod which is shared with the telephone system and the SDARS system where fitted. The roof pod is located externally in a central position towards the rear of the roof and is connected to the navigation computer via a single coaxial lead.
The antenna passes signals from the GPS (global positioning system) satellites to the navigation computer. These signals are processed by the GPS (global positioning system) receiver in the computer to calculate the vehicle position.
It is possible for the GPS (global positioning system) antenna to lose the GPS (global positioning system) signal from the satellites in hilly or tree lined areas, built up areas with tall buildings, multi-storey car parks, garages, tunnels, bridges and during heavy rain/thunderstorms. If the GPS (global positioning system) signal is lost, the navigation computer will continue to give route guidance using memory mapped data from the DVD (digital versatile disc) map.
Microphone
The microphone is located in the front interior lamp console. The standard, directional type microphone is connected to the Integrated Head Unit (IHU) and the navigation computer for voice recognition of the navigation system and the telephone. The microphone has an integrated noise suppression system for hands-free telephone use.
Traffic Message Channel (TMC) - European And North American Markets Only
The TMC is a function of the FM (frequency modulation) RDS (radio data system) available in European market only. The system broadcasts real-time traffic and weather information. The data messages are received from the rear screen FM (frequency modulation) antenna and the TMC amplifier and decoded by the TMC receiver. The TMC receiver passes the data to the navigation computer for processing. TMC messages are filtered by the navigation computer s-that only those messages relevant to the current journey are displayed. This allows the navigation computer to offer dynamic route guidance, alerting the driver of a problem on the planned route and calculating an alternative route to avoid the incident.
TMC traffic information systems conform to a global standard that has been adopted by traffic data companies, information service providers, broadcasters and vehicle/receiver manufacturers. The data is transmitted in a language applicable to the country from which it is broadcast. The TMC information is broadcast by selected radio stations. The TMC receiver automatically scans the FM (frequency modulation) wavelength for TMC transmissions and locks onto that transmission. A small 'TMC' icon is displayed in the TSD navigation screen to inform the driver that TMC information is being received.
All TMC receivers use the same list of event codes, while the location database (on the map DVD (digital versatile disc)) contains both a country specific set of location codes for the strategic European road network. TMC data is currently broadcast in many European countries and North America.
TMC Receiver
The TMC receiver is located in the left hand corner of the luggage compartment. The TMC receiver accepts signals from the TMC antenna amplifier via a single coaxial cable. The TMC receiver is connected on the MOST ring and passes the signal data on the MOST ring to the TSD. The navigation computer receives the data from the TSD on the private CAN (controller area network) bus.
TMC Antenna Amplifier
The TMC antenna amplifier is located in the upper tail door, adjacent to the center high mounted stop lamp. The amplifier is connected to the FM (frequency modulation) antenna which is integral with the rear screen.
Vehicle Information And Communication Systems (VICS) - Japan Only
The VICS supplies the navigation computer with information to enable the navigation computer to re-route the navigation guidance or to inform the driver of traffic conditions in the vehicle's vicinity. Information is provided to the navigation system through three separate routes:
^ RF Transmission
^ Infra-red transmission
^ FM (frequency modulation) multiplex transmissions.
The signals are passed directly from the VICS receiver to the navigation computer.