Quick Guide for
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Nokia 9000/9000i/9110 Communicator
GPS – SMS Application
Version 1.0
By
Nokia Mobile Phones
Copyright. 1999. Nokia Mobile Phones. All right reserved
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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
Copyright. 1999. Nokia Mobile Phones. All right reserved
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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
Positioning
Determination of the relative coordinates of two or more receivers which
are simultaneously tracking the same satellites. Static differential GPS
involves determining baseline vectors between pairs of receivers.
DOP (Dilution of
precision)
A description of the purely geometrical contribution to the uncertainly in a
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
Copyright. 1999. Nokia Mobile Phones. All right reserved
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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
Copyright. 1999. Nokia Mobile Phones. All right reserved
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