LDI DIGISONDE 4D - Section 1 General System Description; Default Chapter; Table of Contents

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DIGISONDE-4D
SYSTEM MANUAL
VERSION 1.2.11
SECTION 1 - GENERAL SYSTEM DESCRIPTION 1-1
SECTION 1
GENERAL SYSTEM DESCRIPTION
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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