GPS Acronyms

2-D or 2D

Two Dimensional

3-D or 3D

Three Dimensional

AC

Alternating Current

A/D

Analog-to-Digital

ADC

Analog-to-Digital Convertor

ADR

Accumulated Doppler Range

ADR

Accumulated Delta Range

AGC

Automatic Gain Control

AK

Authentication Key

AL

Alarm Limit

AltBOC

Alternate Binary Offset Carrier

AMSAT

American Satellite

APC

Aircraft Power Conditioner

ARNS

Aeronautical Radio Navigation Services

ARP

Antenna Reference Point

AS

Anti-Spoofing

ASCII

American Standard Code for Information Interchange

ASIC

Application Specific Integrated Circuits

AVL

Automated Vehicle Locations

BCD

Binary Code Decimal

BDE

Borland Database Engine

BDS

Black Diamond System

BFS

Broadband Fiber Source

BIH

Bureau l'International de l'Heure

BIST

Built-In Self-Test

BIT

Built-In Test

BNR

Binary Numerical Representation

BOC

Binary Offset Carrier

BPS

Bits per Second

BPSK

Bi-Phase Shift Key

BSG

Baseband Signal Generator

BTS

Conventional Terrestrial System (BIH defined)

BW

Bandwidth

C/A Code

Coarse/Acquisition Code

CAN

Controller Area Network

CASM

Coherent Adaptive Subcarrier Modulation

CBIT

Continuous Built In Test

cc

Cubic Centimeters

CCITT

Command, Control, and Intelligence Technical Test

CD

Clock Drift

CD

Compact Disc

cd

Change Directory

CDGPS

Canada-Wide Differential Global Positioning System

CDMA

Code Division Multiple Access

CDPD

Cellular Digital Packet Data

CDU

Control and Display Unit

CE

Conformité Européenna

CEP

Circular Error Probable

CF

Compact Flash

CFGP

Configuration Parameters

CISPR

International Special Committee On Radio Interference

CKSC

Clock/Status Card

CL

Long Code

CLK

System Clock

CM

Moderate Length Code

CMG

Course Made Good

CMP

Comparator Message Processor

CMR

Compact Measurement Record

C/No

Post Correlation Carrier to Noise Ratio in dB-Hz

CoCom

Coordinating Committee on Multilateral Export Controls

COG

Course Over Ground

COGO

Coordinate Geometry

COSPAS

Cosmitscheskaja Sistema Poiska Awarinitsch Sudow (Russian: space system for search of vessels in distress)

CPLD

Complex Programmable Logic Device

CPU

Central Processing Unit

CR

Carriage Return

CRC

Cyclic Redundancy Check

CRR

Common Reference Receiver

CS

Commercial Service

CSIC

Coordination Scientific Information Center

CSA

Canada Shipping Act

CTP

Conventional Terrestrial Pole

CTS

Clear To Send

CTS

Conventional Terrestrial System or Clear To Send

CW

Continuous Wave

dB

Decibel

dBm

Decibel Relative to 1 milliWatt

DC

Direct Current

DCD

Data Carrier Detected

DCE

Data Communications Equipment (Modem)

DCO

Digitally Controlled Oscillator

DDS

Direct Digitial Sampling

DGNSS

Differential Global Navigation Satellite System

DGPS

Differential Global Positioning System

DHCP

Dynamic Host Configuration Protocol

DL

Data Logger

DLL

Delay Lock Loop

DoD

Department of Defence (U.S.)

DOP

Dilution Of Precision

DPB

Digital Pulse Blanking

DR

Dead Reckoning

DRAM

Dynamic Random Access Memory

DRMS

Distance Root Mean Square

DSP

Digital Signal Processor

DSR

Data Set Ready

DTE

Data Terminal Equipment

DTR

Data Terminal Ready

D/U

Desired/Undesired

e

Eccentricity

E-L

Early to Late

ECEF

Earth-Centred-Earth-Fixed

EDM

Electronic Distance Measuring (instrument)

EEPROM

Electrically Erasable Programmable Read Only Memory

EGNOS

European Geo-Stationary Navigation System

EMC

Electromagnetic Compatibility

EMI

Electromagnetic Immunity

EP

Engineering Practice

ESA

European Space Agency

ESD

Electrostatic Discharge

ESN

Electronic Serial Number

FAA

Federal Aviation Administration (FAA)

FCC

Federal Communication Commission

FDA

Frequency Distribution Amplifier

FDMA

Frequency Division Multiple Access

FEC

Forward Error Correction

FEPROM

Flash Erasable Programmable Read Only Memory

FIFO

First In, First Out

FKP

Flachen Korrectur Parameter (Plane Correction Parameter) German

FLL

Frequency Lock Loop

FMEA

Failure Mode Effects Analysis

FOC

Full Operational Capability

FOG

Fibre Optic Gyro

FOM

Figure of Merit

FPGA

Field-Programmable Gate Array

FR

Factory Reset

FTP

File Transfer Protocol

FTS

Frequency and Time Standard

FW

Firmware

GAGAN

GPS Aided GEO Augmented Navigation (India)

GaIn

Galileo Industries

GCC

Galileo Control Centre

GDOP

Geometric Dilution Of Precision

GEO

Geostationary Satellite

GIC

GPS Integrity Channel

GL

GLONASS (NMEA talker ID)

GLONASS

Global Navigation Satellite System

GM

Gauss-Markov

GMS

Ground Mission Segment

GMT

Greenwich Mean Time

GN

Combined GPS and GLONASS (NMEA talker ID)

GND

Ground

GNSS

Global Navigation Satellite System

G.P.

Ground Plane

GP

GPS (NMEA talker ID)

GPAI

General Purpose Analog Input

GPS

Global Positioning System

GRC

Galileo Reception Chain

GRCN

Galileo Reception Chain Non-PRS

GSS

Galileo Sensor Stations

GSTB

Galileo System Test Bed

GTR

Galileo Test Receiver

GTS

Galileo Test Signal Generator

GUI

Graphical User Interface

GUS

Ground Uplink Station

GUST

WAAS GUS-Type 1

GUSTR

WAAS GUS-Type 1 Receiver

HDOP

Horizontal Dilution Of Precision

hex

Hexadecimal

HFOM

Horizontal Figure of Merit

HMAC

Hashed Message Authentication Code

HP

High Performance (standard OmniSTAR service)

HTDOP

Horizontal position and Time Dilution Of Precision

Hz

Hertz

I and Q

In-Phase and Quadrature (Channels)

I Channel

In-phase data channel

IBIT

Initiated Built In Test

IC

Integrated Circuit

ICAO

International Civil Aviation Organization

ICD

Interface Control Document

ICP

Integrated Carrier Phase

ID

Identification

IEC

International Electrotechnical Commission

IEEE

Institute of Electrical & Electronics Engineers

IERS

International Earth Rotation Service

IF

Intermediate Frequency

IGP

Ionospheric Grid Point

IGRF

International Geometric Reference Field

IGS CB

International GPS Service Central Bureau

IM

Intermodulation

IMLA

Integrated Multipath Limiting Antenna

IMO

International Maritime Organization

IMU

Inertial Measuring Unit

INH

Inhibit

INS

Inertial Navigation System

I/O

Input/Output

IODE

Issue of Data (Ephemeris)

IOV

In-Orbit Validation

IP

Internet Protocol

IRQ

Interrupt Request

ISG

IF Signal Generator

ISO

International Standards Organization

ITRF

International Terrestrial Reference System

JPL

Jet Propulsion Laboratory (NASA)

JTAG

Joint Test Action Group

KPA

Klystron Power Amplifier

Kb

Kilobit

KB

Kilobyte

KMF

Key Management Facility

L1

The 1575.42 MHz GPS carrier frequency including C/A and P Code

L2

The 1227.60 MHz secondary GPS carrier frequency (P Code only)

L2C

The L2 civilian code transmitted at the L2 frequency (1227.6 MHz)

L5

3rd civil GPS frequency that tracks at low signal-to-noise ratios (1176.45 MHz)

LAAS

Local Area Augmentation System

LCD

Liquid Crystal Display

LED

Light-Emitting Diode

LF

Line Feed

LGF

LAAS Ground Facility

LHCP

Left Hand Circular Polarization

LME

Line Maintenance Equipment

LNA

Low Noise Amplifier

LO

Local Oscillator

LRU

Line Replacement Unit

LSB

Least significant bit

LVTTL

Low Voltage Transistor Transistor Logic

MAC

Media Access Control (Ethernet)

MAT

Multipath Assessment Tool

Mb

Megabit

MB

Megabyte

MEDLL®

Multipath Estimation Delay Lock Loop

MEO

Medium Earth Orbit

MET

Multipath Elimination Technology

MET

Meteorological

MGRS

Military Grid Reference Systems

MHz

MegaHertz

MIB

Management Information Base

MIL

Military

MINOS

Multiple Independent NOmadic Stargazer

MKI

Mark Input

MKMF

Mission Key Management Facility

MMCX

Multimedia Communications Exchange (Lucent)

MMT

Multipath Mitigation Technology

MOPS

Minimum Operational Performance Standard

MP

Messag Processor

MPC

Modulated Precision Clock

MPM

Multipath Meter

ms

Millisecond

MSAS

MTSAT Satellite Based Augmentation System

MSAT

Mobile Satellite

MSB

Most significant bit

MSL

Mean sea level

MSR

Measure Output

MTBF

Mean Time Between Failures

MTSAT

Multi-Functional Transport Satellite

N/A

Not Applicable

NAS

National Airspace System (United States)

NASA

National Aeronautics and Space Administration (U.S.)

NTS

National Topographic Series (Canada)

NAV

RINEX Ephemeris File

NAVSTAR

NAVigation Satellite Timing And Ranging (synonymous with GPS)

N/C or NC

Not Connected

NCC

Network Control Center

NCO

Numerically Controlled Oscillator

ND

Navigation Data

NH

Neumann-Hoffman

NMEA

National Marine Electronics Association

N. mi.

Nautical mile

NOC

Network Operations Center

ns

Nanosecond

NVM

Non-Volatile Memory

OBS

RINEX Observation File

OCXO

Oven Controlled Crystal Oscillator

OEM

Original Equipment Manufacturer

OP

Operational Parameters

OS

Open Service

PAC

Pulsed Aperture Correlator

PC

Personal Computer

PC

Phase Centre

P-Code

Precise Code

PBIT

Power-Up Built-In Test

PCB

Printed Circuit Board

PCMCIA

Personal Computer Memory Card International Association

PDC

Power and Data Card

PDF

Power Distribution Function

PDF

Portable Document File

PDOP

Position Dilution Of Precision

PE-90

Parameters of the Earth 1990 (see PZ90)

PIN

Position Indicator

PLL

Phase Lock Loop

PPM

Parts Per Million

PPP

Point to Point Protocol

PPS

Precise Positioning Service or Pulse Per Second

PRN#

PseudoRandom Noise number

PRS

Public Regulated Service

PSN

Part Serial Number

PSR

Pseudorange

PV

Position Valid

PVT

Position Velocity Time

PZ90

Parametry Zemli 1990 (see PE-90)

Q Channel

Quadrature data-free channel

RAM

Random Access Memory

RAS

Remote Access Service

RCC

Rescue Co-ordination Centre

RF

Radio Frequency

RFDC

Radio Frequency Direct Current

RFU

Radio Frequency Uplink

RHCP

Right Hand Circular Polarization

RI

Ring Indicator

RINEX

Receiver Independent Exchange Format

RLG

Ring Laser Gyro

RoHS

Restriction of the use of Hazardous Substances

RM

Raw Measurements

ROM

Read Only Memory

RMA

Return Material Authorization

RMS

Root Mean Square

RSS

Residual Solution Status

RTC

Real-Time Clock

RTCA

Radio Technical Commission for Aviation Services

RTCM

Radio Technical Commission for Maritime Services

RTCMV3

RTCM Version 3.0

RTK

Real Time Kinematic

RTS

Request To Send

RXD

Received Data

SA

SMART ANTENNA

SA

Selective Availability

SAE

Society of Automotive Engineers

SAR

Search and Rescue

SARSAT

Search and Rescue Satellite Aided Tracking

SBAS

Satellite Based Augmentation System

SC

Safety Computer

SCAT-I

Special Category I

SD

Standard Deviation

SEP

Spherical Error Probable

SG

Signal Generator

SGS-90

Soviet Geodetic System 1990

SI

Système Internationale

SigGen

WAAS GUS Type-1 Signal Generator

SiS

Signal in Space

SLIP

Serial Line Internet Protocol

SNAS

Satellite Navigation Augmentation System (China)

SNR

Signal-to-Noise Ratio

SOL

Safety-of-Life

SPS

Standard Position Service

sps

Symbols Per Second

SPAN™

Synchronized Position Attitude Navigation

SQM

Signal Quality Monitoring

SRAM

Static Random Access Memory

SS II

SUPERSTAR II

SU

(former) Soviet Union (now Russia)

SV

Space Vehicle

SVID

Space Vehicle Identifier

SVN

Space Vehicle Number

SW

Software

SWRU

Software Replacement Unit

TCP

Transmission Control Protocol

TCXO

Temperature Compensated Crystal Oscillator

TDOP

Time Dilution Of Precision

TES

Time Estimator Status

TIL

Time Integrity Limit

TNM

Telecommunications Network Management

TOA

Time of Almanac

TOE

Time of Ephemeris

TOW

Time of Week

TRAIM

Time Receiver Autonomous Integrity Monitor

TTFF

Time-To-First-Fix

TTL

Transistor-Transistor Logic

TTNL

Time to Narrow Lane

TVS

Transient Voltage Suppressor

TXD

Transmitted Data

UART

Universal Asynchronous Receiver Transmitter

UDP

User Datagram Protocol

UDRE

User Differential Range Error

UHF

Ultra High Frequency

USB

Universal Serial Bus

USGS

United States Geological Survey

UTC

Coordinated Universal Time

UTC(SU)

Coordinated Universal Time (former Soviet Union, now Russia

V AC

Volts Alternating Current

V DC

Volts Direct Current

VARF

Variable Frequency

VBS

Virtual Base Station (standard OmniSTAR service)

VCTCXO

Voltage Controlled Temperature Compensated Crystal Oscillator

VDOP

Vertical Dilution of Precision

VFD

Vacuum Fluorescent Display

VFOM

Vertical Figure of Merit

VSWR

Voltage Standing Wave Ratio

WAAS

Wide Area Augmentation System

WAAS G-II

WAAS Reference Receiver: G-II

WADGPS

Wide Area DGPS

WEEE

Waste Electrical and Electronic Equipment

WGS

World Geodetic System

WHQL

Windows Hardware Quality Lab (Microsoft)

WMP

WAAS Message Processor

WNA

Week number of almanac

WPT

Waypoint

XP

Extra Performance (standard OmniSTAR service)

XTE

Crosstrack Error

ZUPT

Zero Velocity Update