POS MV V5 Installation and Operation Guide
POS-GPS
Timing
Copyright © Applanix Corporation, 2017
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Pound
The pound (avoirdupois) or international pound is the mass unit defined as exactly 0.45359237
kilograms (or 453.59237 grams). It is part of the avoirdupois system of mass units. There are 16
ounces in a pound (avoirdupois). The pound is equal to exactly 7000 grains, where a grain is officially
defined as exactly 0.06479891 gram. The legal definition of the pound in the United Kingdom and
Canada are the same as in the United States, and were unified to their current value in 1960.
PPS Mode
Precise Positioning Service capable GNSS receivers have higher accuracy than C/A code receivers,
but are currently only available for military use.
PPS Strobe
The Pulse per Second Strobe is a TTL-level signal; generated once per second, whose falling edge is
coincident with the GNSS second.
Pseudo-range
A GNSS distance measurement that has not been corrected for differences in synchronization
between the satellite and receiver clocks.
TCP/IP
TCP/IP is a routable protocol, and the TCP part provides transport functions, which ensures that the
total amount of bytes sent is received correctly at the other end.
The IP part of TCP/IP provides the routing capability. In a routable protocol, all messages contain not
only the address of the destination station, but the address of a destination network. This allows
TCP/IP messages to be sent to multiple networks within an organization or around the world, hence its
use in the worldwide Internet. Every client and server in a TCP/IP network requires an IP address that
is either permanently assigned or dynamically assigned at start-up.
Time of Validity
Time of Validity
defines the exact time at which a particular set of data are current.
TTL Level Signal
TTL Level Signals are DC signals interpreted in a discrete fashion. A signal below 0.8V is interpreted
as a LOW, and a signal above 3.3V is interpreted as a HIGH. TTL signals can be likened to a binary
system, where LOW is equivalent to 0, and HIGH is equivalent to 1.
UDP
UDP is a collection of protocols similar to TCP/IP. Most notable among the differences is that data
broadcast in UDP can be read by any computer on the network. In contrast, TCP/IP messages are
directed at particular computer.