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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
SECTION 3 - OPERATING INSTRUCTIONS 3-65
VALID PROGRAMS SUBOPTIMAL FOR SCIENCE OBSERVATIONS
Ionogram measurement
3:124. Program design recommendations for the ionogram measurements are summarized in Table 3-9.
Table 3-9. Program Design Recommendations for Ionogram Measurements
Use beam-forming analysis to
calculate echo directions un-
less malfunction of the re-
ceiver channel(s) is suspected
Echo directions help interpretation
of ionograms, both manual and au-
tomatic by ARTIST
State of hardware health, channel
equalization, and antenna array
placement shall be adequate to use
phase-aware techniques to calculate
directions
Use precision ranging option
Precision ranging removes range
bias, improves resolution, and ulti-
mately helps automatic interpreta-
tion by ARTIST
Dual-frequency analysis for preci-
sion ranging doubles the ionogram
running time and may require
coarser frequencies stepping, lower-
ing on the N (number of integrate
pulses) or the upper frequency limit.
Use 10 ms inter-pulse period
for 1500 km radar range
Provides capability of recording
ionospheric uplift during periods of
storm activity. Ionograms with 750
km radar range miss important ion-
ospheric information.
Setting 10 instead of 5 ms IPP dou-
bles the ionogram running time and
may require time reduction
measures (see usage implications
for recommendation 2).
Use appropriate frequency
resolution of 50 or 25 kHz
ARTIST performance improves
with better frequency resolution.
Smaller frequency step means long-
er running time, which may require
time reduction measures (see usage
implications for recommendation
2).
Watch for fxF2 exceeding the
upper limit of ionogram
Avoid truncated ionograms
Ionograms with higher upper limit
run longer and may require adjust-
ments to the schedules that use
them.
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