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Not for secondary distribution or replication, in part or entirety.
DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
3-4 SECTION 3 - OPERATING INSTRUCTIONS
List of Figures
Figure 3-1: Digisonde
®
Example of a 10 minute schedule 3-6
Figure 3-2: Overview of the Digisonde
®
Data Products and Displays 3-8
Figure 3-3: Frequency Multiplexing as a Means to Increase Doppler Frequency Resolution. 3-10
Figure 3-4: Frequency Multiplexing in Ionogram and Drift Measurements. 3-10
Figure 3-5: Programming Frequency Stepping and Range Sampling for Ionogram and Drift Measurements 3-11
Figure 3-6: Gain Control Steps in Digisonde-4D 3-13
Figure 3-7: “Create Gain Table” Program that Refreshes the Autogain Table (Ionogram File is not Made) 3-14
Figure 3-8: RSF Ionogram with Echo Directions, Running Time ~2 minutes 3-16
Figure 3-9: RSF Ionogram with Echo Directions and Precision Ranging (Running Time ~4 minutes) 3-17
Figure 3-10: SBF Ionogram Without Echo Directions, Antenna 3 Disabled 3-18
Figure 3-11: Ionogram Display Produced by Ion2PNG Software for Digisonde
®
WWW Homepage 3-19
Figure 3-12: Daily Directogram. (Left panel) Sample Directogram made by Drg2PNG Software, (Right Panel) Calculation of
Distance to the Reflection Point, D
i
3-20
Figure 3-13: Signal Propagation During Oblique Incidence Ionogram Measurement Between Two Digisonde
®
Systems. 3-21
Figure 3-14: Digisonde-4D at Jeju Island, Korea, Configured to Receive Signal from Anyang DPS4 (444 km Ground
Distance) Via Oblique Propagation. 3-22
Figure 3-15: Drift Measurement Program and Real-Time Display. 3-23
Figure 3-16: Skymap Display for WWW Homepage 3-25
Figure 3-17: Daily Drift Velocity Plot for WWW Homepage 3-26
Figure 3-18: Sample Passive RF Sensing Measurement of EISCAT Signal at 4040 kHz 3-26
Figure 3-19: Fixed-frequency Passive Measurement of the EISCAT Signal 3-27
Figure 3-20: Time-averaging measurement for HF Surveillance 3-28
Figure 3-21: Frequency spectrum occupancy chart, 0.5 to 1.2 MHz, produced from TAV file (Option A) 3-30
Figure 3-22: Radio silent measurement for HF Surveillance. 3-30
Figure 3-23: Spectrogram display of HF Surveillance measurement (Option B). 3-31
Figure 3-24: Digisonde-4D Computer Configuration with CONTROL and DATA Platforms 3-33
Figure 3-25: Configuring DCART in Normal Interface Mode (General Options) 3-35
Figure 3-26: DCART Screen Layout (Normal Interface) 3-36
Figure 3-27: Digisonde
®
in its (a) Manual and (b) Autonomous Modes of Operation (Push “Auto” Button to Switch to the
Autonomous Mode. Push STOP or Soft STOP to Switch to the Manual Mode. ) 3-38
Figure 3-28: Management of PROGSCHED by DESC and DCART Software 3-39
Figure 3-29: Display of the (a) Active and (b) Edited PROGSCHED in DCART 3-40
Figure 3-30: Activation of the Edited PROGSCHED 3-41
Figure 3-31: Offline Editing of External PROGSCHED Files on DATA Platform 3-42
Figure 3-32: Real-time “Sounding Mode” Display of DCART (Disabled, click to Enable) 3-43
Figure 3-33: Real-time “Sounding Mode” Display of DCART (Enabled, click to Disable) 3-44
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