Broadband longwave radio remote sensing instrumentation
Abstract
We present the performance characteristics of a high-sensitivity radio receiver for the frequency band 0.5-470 kHz, known as the Low Frequency Atmospheric Weather Electromagnetic System for Observation, Modeling, and Education, or LF AWESOME. The receiver is an upgraded version of the VLF AWESOME, completed in 2004, which provided high sensitivity broadband radio measurements of natural lightning emissions, transmitting beacons, and radio emissions from the near-Earth space environment. It has been deployed at many locations worldwide and used as the basis for dozens of scientific studies. We present here a significant upgrade to the AWESOME, in which the frequency range has been extended to include the LF and part of the medium frequency (MF) bands, the sensitivity improved by 10-25 dB to be as low as 0.03 fT/Hz, depending on the frequency, and timing error reduced to 15-20 ns range. The expanded capabilities allow detection of radio atmospherics from lightning strokes at global distances and multiple traverses around the world. It also allows monitoring of transmitting beacons in the LF/MF band at thousands of km distance. We detail the specification of the LF AWESOME and demonstrate a number of scientific applications. We also describe and characterize a new algorithm for minimum shift keying demodulation for VLF/LF transmitters for ionospheric remote sensing applications.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 01, 2018
- Source ID
- 10.1063/1.5041419
Entities
People
- Evans W. Paschal
- Jackson C McCormick
- Jeffrey T. Chang
- Lee Thompson
- Marc Higginson-rollins
- Morris B Cohen
- Nicholas C Gross
- Ryan K. Said
- Umran Savaş İnan
Organizations
- Defense Advanced Research Projects Agency
- Georgia Institute of Technology College of Engineering
- Georgia Tech
- Koç University
- National Science Foundation
- SpaceX
- Stanford University