Motorola M12 Oncore User's Guide download pdf (Page 43)

Chapter 3 – Receiver Description

Motorola GPS Products - Oncore User’s Guide

DATA LATENCY (CONTINUED).

Figure 3.11: Position/Status/Data Output Message Latency

To compensate for the one second computational pipeline delay, a one second

propagated position is computed that corresponds to T

based on the position and

velocity data computed from measurements taken at time T

k -1

. In this way, the

position data output on epoch T

will most closely correspond with the receiver true

position when the data is output on the TTL port. Of course, there can be a position

error due to the propagation process if the receiver is undergoing acceleration. The

error can be as large as 4.5 m for every G of acceleration. There is no significant

error under stationary or constant velocity conditions.

Revision 5.0 08/30/02

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Motorola M12 Oncore User's Guide Page 43