POS MV V4 User Guide
Introduction
Copyright © Applanix Corporation, 2009
1-18
post-processed using POSPac to further enhance the quality of seafloor maps
generated by multi-beam sonar systems. Contact Applanix for more
information on POSPac.
Ethernet Real-Time Output
High rate data are available from the PCS data port using Universal Datagram
Protocol (UDP) broadcasts. The emphasis here is outputting timely data, even
though there may be some data loss.
Event Tagging
POS MV provides the facility to ‘time tag’ events using either UTC or GPS
Time.
Note: UTC and GPS Times are not identical. Due to the occasional need for a
‘leap second’ to be applied to UTC, there is an integer number of seconds
time difference between UTC and GPS Time. Transitions between seconds
are precisely coincident for both UTC and GPS Time.
Time tagging of events occurs through the EVENT port on the PCS rear
panel. To tag an event using UTC or GPS Time you must provide POS MV
with a Transistor-Transistor Logic (TTL) level pulse. You can configure POS
MV for a positive edge trigger or a negative edge trigger.
You must also provide a reference ground on one of the ground lines.
To Next Page
