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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
SECTION 3 - OPERATING INSTRUCTIONS 3-27
3:46. Figure 3-19 presents the measurement program specification for the EISCAT signal reception data
shown in Figure 3-18 to serve as an example of a program that listens to a transmitter of opportunity. The raw
data is processed by an averaging filter and saved in the Uniform Measurement Storage (UMS) format with full
4 antenna data storage option (.TAV files) for offline analysis in DCART.
Figure 3-19: Fixed-frequency Passive Measurement of the EISCAT Signal
Programming HF Surveillance Measurements
3:47. The Digisonde-4D can be used as a passive HF Surveillance Monitor to record levels of background
radio emissions within its nominal range of operating frequencies from 100 kHz to 30 MHz. The following op-
tions are available for the HF Surveillance:
A. Best: Use a dedicated radio-silent time-averaging mode measurement. In Option A, receiver band-
width is 120 Hz (5 ms time per frequency) or 60 Hz (10 ms time per frequency). Frequency stepping
between individual measurements can be selected as high as 1 kHz for an accurate identification of the
narrowband emissions (see discussion of TAV measurements in Section 1). The data format is UMS,
and the file extension is TAV.
B. Good: Use a dedicated radio-silent ionogram mode measurement. In Option B, data is collected
with a receiver bandwidth of 43 kHz, the time per frequency is 5 ms, and the frequency resolution can
be selected at 3 or 5 kHz. To reduce the receiver bandwidth at each frequency step, individual samples
can be additionally filtered in post-analysis using custom software. The data format is UMS and the,
file extension is ION.
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