Glossary
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read-only memory
Memory whose contents can be read, but not changed.
Information is placed into ROM only once. The contents of
ROM are not erased when the system unit's power is turned
off.
real time clock
An electronic clock, usually battery powered, that keeps
current time. Used by a GPS receiver during a warm or hot
start to determine where to search for GPS satellite signals.
relative
positioning
The process of determining the vector distance between two
points and the coordinates of one spot relative to another.
This technique yields GPS positions with greater precision
than a single point positioning mode can.
rise/set time
Refers to the period during which a satellite is visible; i.e.,
has an elevation angle that is above the elevation mask. A
satellite is said to “rise” when its elevation angle exceeds the
mask and “set” when the elevation drops below the mask.
ROM
Read-Only Memory.
RS-232
A communication standard for digital data. Specifies a
number of signal and control lines. RS-232 is often
associated with a 25 pin connector called a DB-25.
RTCM
Radio Technical Commission for Maritime Services.
Commission that recommends standards for differential GPS
services. “RTCM Recommended Standards For Differential
GPS Service,” prepared by RTCM Special Committee No.
104 (RTCM SC-104), defines a communication protocol for
sending GPS differential corrections from a differential
reference station to remote GPS receivers.
satellite masks
As satellites approach the horizon, their signals can become
weak and distorted, preventing the receiver from gathering
accurate data. Satellite masks enable you to establish criteria
for using satellite data in a position solution. There are three
types of satellite masks: Elevation, SNR, and PDOP.
Summary of Contents for SQ
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Page 14: ...About this Manual xiv Lassen SQ GPS Receiver...
Page 46: ...2 Hardware Integration 32 Lassen SQ GPS Receiver...
Page 150: ...B TSIP Tool kit User s Guide 136 Lassen SQ GPS Receiver...
Page 166: ...C NMEA 0183 152 Lassen SQ GPS Receiver...
Page 171: ...Lassen SQ GPS Receiver 157 Specifications and Mechanical Drawings D...
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