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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
SECTION 1 - GENERAL SYSTEM DESCRIPTION 1-11
Linear Frequency Scan for Ionogram
Multiplexed Frequency Scan (finer Doppler resolution)
Multi Fixed-Frequency (for TID and absorption studies)
Plasma Drift & Ionospheric Tilt (direction and velocities)
Synthesized Multi-beam Reception (detects off-vertical echoes)
Precision Group Height (0.5 km h’ accuracy)
HF Surveillance Mode
Software (included with system)
Linux and Real-Time Executive for Multiprocessor Systems
(RTEMS)
WEB Server for Real-Time Data
Monitoring
Apache, with access to real-time displays of ionogram, directogram,
skymap, drift velocity data and BIT
DESC (Control platform).
DCART, Dispatcher, ARTIST with NHPC, DDA (Data platform).
Automatic Real-Time Ionogram Scaling with True Height Analysis
(ARTIST)
Online Drift Data Processing
DDA (Drift Data Analysis) software, skymap generation, drift veloci-
ty analysis, and calculation of ionospheric tilt
FTP to multiple destinations
Active Crossed loops – Turnstile antennas (1.5m diameter)
4 antennas in equilateral triangle 45-60 meters with the fourth antenna
located at the center of the three.
Schedule 80 PVC, with wire braid loop elements
Preamplifier (powered via RF cable) with electronically switched po-
larization.
-123 dBm (in 34kHz bandwidth, not including signal processing)
Specifications for Transmitter Antenna
Turnstile Delta or Rhombic (2 orthogonal radiating elements)
30 m or larger recommended
Data Post-Analysis Workstation
Intel Dual Core processor, 19” LCD monitor, DVD R/W, Color
Printer
Ionogram Editing and Profile
Inversion
SAO Explorer with NHPC electron density profile inversion tool, In-
ternational Reference Ionosphere model, and access to the UML
DIDBase data repository
Drift Explorer with access to UML Drift-DB data repository
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