Figure 42: navigation rate – NavCom StarUtil Rev.G User Manual
Page 51
StarUtil User Guide – Rev. G
Binary Messages window and the NMEA Messages window, respectivel
Figure 42).
y (see
essage B0 only, the rate of On Change (the default) is 1Hz
igation rate setting. To set the output of B0 at a higher rate to
window. The rate must be
data rate (refer to message 0x30 in the Technical
Figure 42: Navigation Rate
at N 33
º
50’20.18592” W 118
º
20’35.21218” for three seconds and
e because the position
didn’t change. If any element of the position changes continuously during the
ution: The default setting is three satellites. Four satellites are the
quired for a 3D navigation solution, plus an acceptable PDOP.
0.0.
s that can be "seen" by the receiver
and the angle between the receiver and satellites as a constellation seen by the
receiver. A satellite near the horizon usually provides a lower quality signal
because of greater atmospheric interference and the increased likelihood of the
signal reflecting from surface features; this is known as "multipath" error. The
effect of geometry on GPS quality is measured by PDOP (position dilution of
precision). PDOP is the overall measure of the precision obtainable with a given
For the NCT Binary m
regardless of the nav
match the output of B1, use the NCT Binary Messages
a purchased navigation and raw
Reference Manual).
When a message is set to On Change, the data is output each time new data is
available as determined by the Navigation Rate setting. For example, if a position
is steadfast
the Navigation Rate is 5Hz, a 0xb1 solution is output 1 tim
three second period then a 0xb1 solution is output 15 times.
The NMEA messages GGA, RMC, and VTG match the output of the navigation
rate up to 10 Hz max when scheduled as On Change.
Refer to Figure 41 for these two options:
• Min SVs for Sol
minimum SVs re
• Max PDOP for solution: Enter the highest PDOP value according to application
requirements. The maximum PDOP value at which the receiver will compute positions is
25.5. An applied value above 25.5 reverts to the default of 1
The quality of GPS data is dependent on the geometry between the receiver and
satellites; this includes the number of satellite
5-49