Accession Number : ADP006527

Title :   Artificial Ionospheric Mirrors for Radar Applications,

Corporate Author : ARCO POWER TECHNOLOGIES INC WASHINGTON DC

Personal Author(s) : Short, Robert D. ; Wallace, Tom ; Stewart, Clayton V. ; Lallement, Pierre ; Koert, Peter

Report Date : OCT 1990

Pagination or Media Count : 12

Abstract : Recognition of performance limitations associated with traditional skywave over-the-horizon (OTH) high frequency (HF) radars has led a number of investigators to propose the creation of an Artificial Ionospheric Mirror (AIM) in the upper atmosphere, in order to reflect ground-based radar signals for OTH surveillance. The AIM is produced by beaming sufficient electromagnetic Power to the lower ionosphere (around 70 km) to enhance the in situ ionization level to 107 108 electrons/cm3, thereby providing an ionized layer capable of reflecting radar frequencies of 5 - 90 MHz. This paper presents a baseline AIM system concept and an associated performance evaluation, based upon the relevant ionization and propagation physics and in the context of air surveillance for the cruise missile threat. Results of the subject study indicate that a system using this concept would both complement and enhance the performance of the existing skywave OTH radars.

Descriptors :   *RADAR REFLECTIONS, *IONOSPHERIC MODIFICATION, *OVER THE HORIZON RADAR, *SPACE SURVEILLANCE, ATMOSPHERES, CRUISE MISSILES, ELECTRONS, GROUND BASED, IONIZATION, LAYERS, LIMITATIONS, POWER, RADAR SIGNALS, RECOGNITION, THREATS, UPPER ATMOSPHERE, SKY WAVES, HIGH FREQUENCY.

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE