LDI DIGISONDE 4D Installation guide

An HF Radar System for Ionospheric Research and Monitoring
TECHNICAL MANUAL
Operation and Maintenance
Document Version 1.2.11
Lowell Digisonde International
175 Cabot Street, Suite 200
Lowell, Massachusetts 01854
www.digisonde.com
Telephone: [phone]
Facsimile: [phone]
E-Mail: [email protected]
Distribution A: “Approved for public release”.
“LDI Intellectual Property. Not for secondary distribution or replication, in part or entirety.”

LDI Intellectual Property.
Not for secondary distribution or replication, in part or entirety.
DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
REVISION LOG
This log identifies those portions of this document which have been revised since the original issue released on
January 28, 2009.
Rev.
Date
Description
Initiator
IR
01-28-09
Initial release
1.0.1
01-05-10
Small changes like capitalization, keep with text, etc.
1.2.0
03-30-10
1. Modify header to include document version information
2. Add information regarding receive antenna proximity to
metal fencing on page 2-5
3. Add addendum regarding remote ON / OFF Modification
to Section 6 (Annex B)
RH
1.2.1
6-01-10
1. Accepted changes from 1.2.0, and update text to include
LDI.
2. Updated text on section 1 paragraph 102
3. Updated figure 6-12
4. Added TOC to front of document
5. Updated: Digisonde 4D Specifications Table
6. Updated: Figure 2-1, Figure 2-2, Figure 3-46
SM
1.2.2
9-14-10
Applied ARINC “redline” suggested edits
1. Added Digisonde 4D to Figure 1-2
2. Numbered paragraphs are consistent throughout sections
and Footers in Annex sections updated.
3. Updated Antenna array in Table 1-1
4. Para 1:26 changed “seven dimensional” to “six
dimensional
5. Figure 1-17 removed “VI” from caption
6. Para 2:7 changed “consists of one or two” to “usually
consists of two”
7. Para 2:17a reworded & Para 2:21 reworded
8. Para 2:28 removed “or magnetic compass north”
9. Para 2:30 –2:33 added “Surge protectors”
10. Para 2:56 replaced ImposedRestriction.UDD” with
“StationSpecific.UDD”
11. Fig 4-4, Fig 4-23 & Fig 4-24 added “Block Diagram” to
caption
12. Para 4:11, Para 4:40 –4:42 reworded
13. Removed “continue” from Figure 4-21 caption
14. Figure 4:16 & Figure 4:18 updated
SM

LDI Intellectual Property.
Not for secondary distribution or replication, in part or entirety.
DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
15. Table 5:4 Replaced <60 with ≤60
16. Para 6:16 –Para 6:19 added figure reference
17. Table 6A:1 Updated
1.2.3
2-11-11
1. Updated Para 6:34 & 6:35
2. Repagination
SM
1.2.4
12-2-11
1. Updated code in Para 1:33 (changed 0 to -1)
2. Updated Para 1:34, 1:40, 1:42, 1:48, 1:50, 1:57
3. Updated figure 2-2
4. Updated Para 2:30 & 2:31
5. Removed Para 2:67 –2:72 (Verification of RX
Combined Phase Response)
6. Removed Figure 2-1: Calibration of Combined Phase
Response of Cables, Preamplifiers and Antenna Switch
7. Removed Figure 2-9: Program for External Loopback
Validation of Digisonde 4D Receiver Setup
8. Figure 2-10: Data from External Loopback Validation of
Digisonde 4D Receiver Setup
9. Updated Para 3:45 (added UMS)
10. Added new Para 3:46 –3:49 “Programming HF
Surveillance Measurements”
11. Updated figure 3-19,
12. Added new figures 3-20, 3-21, 3-22, 3-23
13. Updated para 3:147, 3:148, Note, 3:152, 3:153
14. Added new para 3:149, 3:150
SM
1.2.5
1-18-13
1. Updated Figure1.2
2. Replaced VN with in 1:41 & 1:51
3. Renumbered Equations in Section1
4. Updated text 2:8, 2:10
5. Removed figure 2-10(Mirror Antenna Layout)
6. Table 5A-6. updates
a. added version3 to title
b. Antenna option and range
c. Polarizations
d. Number of Integrated Repeats (range)
e. Automatic gain control (range)
f. Save Data Flags (and range)
g. Number of Ranges to Output (range)
h. DIG_MODEL change to TX_ST_MODEL
i. Blue highlights and yellow highlights updated
7. Added paragraph numbering to Section5 –Annex
A,B,C
8. Updated Section 5 –ANNEX C(added UMS, Tables
5C-27, 5C-28, 5C-29)
SM

LDI Intellectual Property.
Not for secondary distribution or replication, in part or entirety.
DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
9. Updated note 5.92
10. Added “®” to all instances of Digisonde in the manual
11. Updated figure6-5
12. Updated section 6 numbering
13. Updated 6-4
1.2.6
9/17/13
3/27/14
1. In Table 5C-37 updated #46, #47-48
2. Changed reference to Table 6-3 in Table 5C-38 &
Table 5C-43 to 5C-37
3. Globally changed DPS-1 to DPS1, DPS-4 to DPS4,
DPS-4D to DPS4D, Digisonde® 4D to Digisonde-4D,
Digisonde® 128 to Digisonde-128, Digisonde® 256 to
Digisonde-256
4. Updated caution statement after 2:16
5. Added a new Figure 2-1
6. Updated 2:19 text.
SM
1.2.7
10/8/15
1. Global update of text and figures
SM
1.2.8
06/08/18
1. Made changes to all sections to include changes due to
new data computer hardware and migration to Linux
operating system.
RH, DK, SM
1.2.9
4/16/19
1. Section 1 replaced “Windows XP” with “Linux”
2. Removed all references c:\ or d:\ and placed linux
paths.
3. Section 4, added a missing paragraph number 4:28 for
the Preprocessor Card section.
4. Updated Configuring GPS text (4:56)
SM, RH
1.2.10
4/23/20
1. Updated Section 2:8-2:18 in regards to
Vegetation/Conductive Obstructions
DK, RH, SM
1.2.11
2/8/21
1. Replaced NEXION with DPS4D and small changes in
Section7
RH
Version format is X.Y.Z.
X denotes major release.
Y denotes addition to a section or significant modification to one or more sections.
Z denotes small grammatical corrections and modifications.

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
TABLE OF CONTENTS 1
SECTION 1 – GENERAL SYSTEM DESCRIPTION

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
2 TABLE OF CONTENTS….
SECTION 2 – INSTALLATION, SETTING UP AND FIELD VALIDATION

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
TABLE OF CONTENTS 3
SECTION 2 – INSTALLATION, SETTING UP AND FIELD VALIDATION
(continued)

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
4 TABLE OF CONTENTS….
SECTION 3 – OPERATING INSTRUCTIONS

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SYSTEM MANUAL
VERSION 1.2.11
TABLE OF CONTENTS 5
SECTION 3 – OPERATING INSTRUCTIONS (continued)

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
6 TABLE OF CONTENTS….
SECTION 3 – OPERATING INSTRUCTIONS (continued)

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
TABLE OF CONTENTS 7
SECTION 4 – HARDWARE DESCRIPTION

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
8 TABLE OF CONTENTS….
SECTION 4 – HARDWARE DESCRIPTION (continued)

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
TABLE OF CONTENTS 9
SECTION 5 – SYSTEM SOFTWARE

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SYSTEM MANUAL
VERSION 1.2.11
10 TABLE OF CONTENTS….
SECTION 5 – SYSTEM SOFTWARE (continued)

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
TABLE OF CONTENTS 11
SECTION 5 – SYSTEM SOFTWARE (continued)

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SYSTEM MANUAL
VERSION 1.2.11
12 TABLE OF CONTENTS….
SECTION 6 – MAINTENANCE

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SYSTEM MANUAL
VERSION 1.2.11
TABLE OF CONTENTS 13
SECTION 7 – HARDWARE REFRESH

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LDI Intellectual Property.
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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
SECTION 1 - GENERAL SYSTEM DESCRIPTION 1-1
SECTION 1
GENERAL SYSTEM DESCRIPTION
_______________________________________________________________________________
SECTION CONTENTS
Page
SECTION 1 1-1
CHAPTER 1 _ THE DIGITAL PORTABLE SOUNDER DPS4D .................................................. 1-3
ORGANIZATION OF THE MANUAL ......................................................................................................... 1-3
DIGISONDE® FAMILY OF IONOSPHERIC SOUNDERS ......................................................................... 1-4
GENERAL DESCRIPTION ........................................................................................................................ 1-4
Digisonde-4D Block Diagram ................................................................................................................ 1-6
SPECIFICATIONS ..................................................................................................................................... 1-9
CHAPTER 2 _ METHODOLOGY, THEORETICAL BASIS, AND IMPLEMENTATION ............. 1-12
BACKGROUND: IONOSPHERIC PROPAGATION OF RADIO WAVES ................................................ 1-12
MOTIVATION FOR A SMALL FLEXIBLE IONOSPHERIC SOUNDER .................................................. 1-13
SIGNAL PROCESSING IN DIGISONDE-4D ........................................................................................... 1-14
General Considerations ....................................................................................................................... 1-14
Coherent Pulse Integration in Time Domain ....................................................................................... 1-15
Coded Pulses to Facilitate Pulse Compression Radar Techniques .................................................... 1-16
Coherent Spectral Integration ............................................................................................................. 1-25
Complex Windowing Function ........................................................................................................ 1-29
Multiplexing .......................................................................................................................................... 1-29
Radio Frequency Interference Mitigation (RFIM) ................................................................................ 1-30
Angle of Arrival Measurement Techniques ......................................................................................... 1-34
Digital Beamforming (Aperture Resolution Technique) .................................................................. 1-36
Drift Mode – Super-Resolution Direction Finding ........................................................................... 1-38
Two Frequency Precision Ranging Mode ........................................................................................... 1-39
Passive RF Sensing Measurements ................................................................................................... 1-41
RF SYSTEM DESIGN CONSIDERATIONS ............................................................................................ 1-44
BIBLIOGRAPHY ...................................................................................................................................... 1-46