Specifications

VP ONCORE COMMAND REFERENCE

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8 CHANNEL SATELLITE RANGE DATA OUTPUT

MESSAGE (@@Eg)

NOTE: The input/output messages described here are available only if

GPS receiver Option C is installed.

This parameter determines the rate that basic satellite range and range-

rate information for each of the satellites that the VP receiver is tracking

is output. The user has the option of requesting the satellite range data

status one time, (polled) or continuously at a user specified update rate.

The selected rate is stored in the VP receiver's non-volatile memory. If

the receiver was continuously outputting the satellite range data output

when turned off, it will begin to output this message continuously (at the

selected update rate) again when power is reapplied.

If the VP receiver is in Idle mode (see

@@Cg command), the output

rate parameter selection does not exist, and the GPS receiver outputs

the last known valid Range Data Output information once when polled.

Two bits in each of the channel tracking mode words of the response

message are used to denote whether or not the channel has lost phase

lock or frequency lock since the last output of this message. This

information is helpful for users who perform post-processing and it

eliminates the need to output this message at a one-second rate.

The channel tracking mode in this response message is not necessarily

the same as the channel tracking mode in the Position/Status/Data

Output Messages (

@@Ba and/or @@Ea.) When the receiver is not

using the channel as part of the position fix solution, the GPS satellite

time (Integrated Carrier Phase Filtered) will be zero, and the channel

tracking mode will report mode 4 or lower. When the receiver is using the

channel as part of the position fix solution (modes 5 through 8, after

reaching mode 8 once), the GPS satellite time (Integrated Carrier Phase

Filtered) will be valid, and the channel tracking mode will be the same as

the channel tracking mode in the Position/Status/Data Output Messages.

129 Synergy Systems, LLC 05OCT01