CSI Wireless Seres, Справочное руководство

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Seres Reference Manual
96
market an alternative to users in replace of costly subscription-based
differential services around the world where free services such as DGPS
beacon and SBAS did not exist.
Q – Will e-Dif perform as well as other correction services?
A – e-Dif will perform with a similar level of performance as other
differential services at first. There will be a slow drift to the positioning
performance with increasing time. We normally allow e-Dif to age for a
maximum of 30 to 40 minutes, however, it’s up to you on how long you
will allow it to age. A simple update to the reference position will again
provide best performance.
Q – Will e-Dif correct for multipath?
A – No, there’s no method of differentially correcting multipath signals.
There’s only ways of reducing their impact on the measurements gathered
by the receiver.
6.8 External Corrections
Q - My Seres system doesn’t appear to be using corrections from an
external correction source, what could be the problem?
A - This could be due to a number of issues:
•
Make sure that the corrections are of an RTCM SC-104 protocol.
•
Check to see that the baud rates of the port used by the Seres matches that of
the external correction source
•
The external correction source should be using an 8 data bit, no parity, and 1
stop bit serial port configuration.
•
Inspect the cable connection to ensure there’s no sign of damage
•
Check the pin-out information for the cables to ensure that the transmit line
of the external correction source is connected to the receive line of the Seres
antenna’s serial port and that the signal grounds are connected.