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B TRIMBLE ASCII INTERFACE PROTOCOL (TAIP)
196 Copernicus GPS Receiver
IP Initial Position
Data String Format:
(S)AA(S)BBB(S)CCCC
This is a very coarse initial position that can be used to aid the receiver in obtaining
its first fix. This is particularly useful with a receiver that does not have battery
backup enabled. In such cases, every time the unit is powered up, it goes through a
complete cold-start and it has absolutely no knowledge of where it is. Providing this
message improves performance by decreasing the time to first fix and enhances the
accuracy of the initial two dimensional navigation solutions by providing a reference
altitude. In case of units with battery backed memory, sending this message is only
helpful if the unit has moved more than 1,000 miles since its previous fix. In either
case, the receiver can initialize itself appropriately without any data from the user; it
merely requires more time.
Note – For all the above values, the first character (S) specifies the sign
“+” or “-”.
Example:
The following message will set the initial position to 37
o
North, 122
o
West, altitude
10 meters.
>SIP+37-122+0001<
Item # of Char Units Format
Initial Latitude 3 Deg (S)AA
Initial Longitude 4 Deg (S)BBB
Initial Altitude 5 10 meters (S)CCCC
Total number of characters is 12