Vector Sensor Reference Manual 116
PocketMAX utility discussed in Chapter 5 is a useful tool that provides this information without
needing to use NMEA commands.
Q - Does it matter much if the Vector Sensor is frequently loosing lock on beacon signals due to a
noisy environment or weak signals?
A - No, provided that the receiver is receiving a full set of corrections relatively often. Using the
COAST technology, the Vector Sensor will be able to perform well for up to 30 to 40 minutes
with old correction data, depending on the degree of tolerable drift. In order to obtain a full set of
corrections, the beacon receiver needs to be locked for a few seconds for a 200 bps station,
depending on the number of satellite corrections be transmitted. For a 100 bps modulation rate,
it could take up to six or more seconds, depending on the number of satellite corrections being
sent. After this, the receiver can coast until the next set of corrections has been received, if
there’s further data loss.
8.9 External Corrections
Q - My Vector Sensor 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 Vector Sensor 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 Vector Sensor’s serial port and that the signal grounds are
connected.
8.10 Installation
Q - Does it matter where I mount the Vector Antenna Array?
A - Yes, as the main consideration is that it must have an open hemisphere of sky for satellite
tracking. Additionally, the position that it computes is reference to the center of the primary GPS
antenna. It should be placed in the location for which you would like a position. Often, this is the
center line of a vessel.
Q - Will the method of mounting the Vector Sensor system?
A - No, all methods of mounting the Vector Sensor system are equally suited for its use, provided
that you’ve followed all the guidelines in this manual.
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