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4.2.3
ISMBANDWIDTH Controls detrending filter bandwidth
This command allows the user to modify the bandwidths of the 6th-order Butterworth filters: a high-
pass filter for detrending raw phase measurements and a low-pass filter for detrending raw amplitude
measurements. The bandwidths may be individually varied between 0.01 to 1.0 Hz (phase) and 0 to 1.0
Hz (amplitude). A 0 Hz value for the phase filter bandwidth is not valid. If 0 Hz (default value) is input
for the amplitude filter bandwidth, the amplitude detrending is accomplished using a straight 60 second
average of the amplitude. This is the most desirable method when long fade amplitude scintillation is
present, since the Butterworth detrending of amplitude tends to become unstable and provides exces-
sively large S
values. The straight averaging method is more susceptible to multipath fading.
4
Abbreviated ASCII Syntax:
ISMBANDWIDTH phase_bandwidth amplitude_bandwidth
Input Example:
ismbandwidth 0.01 0.0
Field
Field Type
1
ISMBANDWIDTH
Header
2
Phase bandwidth
3
Amplitude
bandwidth
49
ASCII
Binary
Value
Value
-
-
This field contains the
command name or the
message header
depending on whether the
command is abbreviated
ASCII, ASCII or binary,
respectively
Phase filter bandwidth
(Hz)
Amplitude filter bandwidth
(Hz)
Binary
Description
Format
-
DOUBLE 8
DOUBLE 8
GPStation-6 User Manual Rev 2
Commands
Message ID: 1392
Binary
Binary
Bytes
Offset
H
0
H
H+8
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