Nokia 9000 User Manual

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Quick Guide for

Nokia 9000/9000i/9110 Communicator

GPS – SMS Application

Version 1.0

Nokia Mobile Phones

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Table of Contents

1.	ABBREVIATIONS .............................................................................................................................		3
2.	APPLICATION .................................................................................................................................		6
	2.1	THE SERIAL PORT CONNECTION ..............................................................................................	6
	2.2	THE USER INTERFACE.............................................................................................................	6
	2.3	THE SMS SENDING SUPPORT. ..............................................................................................	10
3.	GPS FRAME STRUCTURE.............................................................................................................		11
	3.1	GGA FRAME.........................................................................................................................	11
	3.2	VTG FRAME .........................................................................................................................	12
4.	SMS STRUCTURE........................................................................................................................		13
5.	LEGAL NOTICE ............................................................................................................................		13

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1. ABBREVIATIONS

This section defines some technical terms and abbreviations used in the field of GPS technology.

Almanac	A reduced-precision subset of the ephemeris parameters. Used by the
	receiver to compute the elevation angle, azimuth angle and estimated
	Doppler of the satellites. Each satellite broadcasts the almanac for all the
	satellites in the system
C/A code	The Coarse/Acquisition code. This is the civilian code made available by
	the Department of Defense (DOD). It is subject to selective availability
	(SA). Users can reduce the effects of SA using differential GPS.
DGPS	Differential GPS is a procedure for correcting GPS solutions to achieve
	improved position accuracy. Differential GPS provides 2 to 5 meter
	position accuracy. Differential accuracy is obtained by applying
	corrections determined by the stationary Differential GPS Reference
	Station to the GPS data collected by the RPU unit on board the vehicle.
Differential Relative	Determination of the relative coordinates of two or more receivers which
Positioning	are simultaneously tracking the same satellites. Static differential GPS
	involves determining baseline vectors between pairs of receivers.
DOP (Dilution of	A description of the purely geometrical contribution to the uncertainly in a
precision)	position fix, given by the expression DOP = SQRT TRACE (AA) where
	AA is the design matrix for the instantaneous position solution
	(dependent on satellite-receiver geometry). Standard terms for the GPS
	application are:
	GDOP: Geometric (three position coordinates plus clock offset in the
	solution)
	PDOP: Position (three coordinates)
	HDOP: Horizontal (two horizontal coordinates)
	VDOP: Vertical (height only)
	TDOP: Time (clock offset only)
Epoch	Measurement interval or data frequency, as in making observations every
	15 seconds. Loading data using 30-second epochs means loading every
	other measurement
GDOP	Geometric Dilution of Precision. GDOP describes how much an
	uncertainly in pseudo-range and time affects the uncertainty in a position
	solution. GDOP depends on where the satellites are relative to the GPS
	receiver and on the GPS clock offsets.
Geoidal separation	Geoidal separation is the difference between the WGS-84 earth ellipsoid
	and mean-sea-level

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GPD	GPS with differential corrections applied.
GPS	Global Positioning System. A constellation of 24 radio navigation
	satellites which transmit signals used (by GPS receivers) to determine
	precise location (position, velocity and time) solutions. GPS signals are
	available worldwide, 24 hours a day, in all weather conditions. This
	system also includes 5 monitor ground stations, 1 master control ground
	station and 3 upload ground stations. GPS provides 20 to 50 meter
	position accuracy without differential correction.
GPS Antenna	An antenna designed to receive GPS radio navigation signals.
GPS Receiver	The combination of a GPS antenna and a GPS processor.
GPS Time	The length of the second is fixed and is determined by primary atomic
	frequency standards. Leap seconds are not used, as they are in UTC.
	Therefore, GPS time and UTC differ by a variable whole number of
	seconds.
Maximum PDOP	A measure of the maximum Position Dilution of Precision that is
	acceptable in order for a GPS processor to determine a location solution.
NAVSTAR	The name given to the GPS satellites, built by Rockwell International,
	which is an acronym formed from NAVigation System with Time And
	Ranging.
NMEA	National Marine Electronics Association. An association that defines
	marine electronics interface standards for the purpose of serving the
	public interest.
NMEA 0183 message	The NMEA 0183 is a standard for interfacing marine electronics
	navigational devices. The standard specifies the message format used to
	communicate with marine devices/components.
PDOP	Position Dilution of Precision. PDOP is a unitless figure of merit that
	describes how an uncertainty in pseudo-range affects a position solution.
Relative Positioning	The process of determining the vector distance between two points and
	the coordinates of one spot relative to another. This technique yields a
	GPS position with greater precision than single point positioning mode
	can.
RS-232	A communication standard for digital data.
RxD	Received Data. RS-232 Signal Function Connector Pin Designation.
SA	Selective Availability

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