974-72007001/1.0 1007D Altimeter Operators Manual
Page 10 Theor
of Operation
Kongsberg Mesotech Ltd.
Port Coquitlam, BC - Canada
In 807 and 808 modes the resolution and maximum range are
set to fixed factory-default settings. In 809 and MS1000
modes the maximum range is adjustable, and the resolution is
automatically adjusted to achieve the best resolution that will
maximize sample memory usage.
The resolution and maximum range determine the number of
samples acquired during each ping. Increasing the number of
samples increases the processing time required by the
altimeter's DSP, therefore decreasing the overall ping rate.
The maximum resolution is therefore programmable in 809
and MS1000 modes to allow the operator to adjust the balance
between ping rate and resolution as required. In 809 mode this
adjustment is performed by the 'Q' command (section 4.2.2).
In MS1000 mode, a slider adjustment in the MS1000 software
controls the ping rate vs. resolution optimization when
profiling without a displayed image.
2.3 Over-range Condition
An "over-range" condition exists if a distinct, valid return is
not found within the altimeter's current range settings, where:
i. "distinct" implies that the distance between a return
pulse and the next pulse exceeding the minimum
threshold exceeds the minimum gap width setting.
ii. "valid" implies that a return pulse meets all of the
following conditions:
it is located within the minimum, maximum
range settings.
its amplitude exceeds the minimum threshold.
its width exceeds the minimum width setting.
its corresponding range is within the range
window of the altitude measurement of the
previous ping (if range windowing is enabled).
To Next Page
Loading...