Accession Number:

ADA243111

Title:

Multipath Induced Tracking Errors at 95 and 140 GHz

Descriptive Note:

Final rept. Dec 86-Mar 87

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Report Date:

1991-11-01

Pagination or Media Count:

48.0

Abstract:

The results of an experimental study to assess the effect of multipath propagation on the performance of low- angle tracking radars are described. Measurements of angular tracking errors at 95 and 140 GHz with a common conical scan antenna were made by tracking a trihedral reflector that was moved along a continuous range of heights between 0.4 and 3.6 m above the ground. Antenna diameters of 0.93 m 3 ft and 0.62 m 2 ft were used for propagation path lengths of 2,850.0 m and 838.4 m, respectively. The results indicate that angular error is substantially higher when tracking over snow and ice than when tracking over grass. Typically, for trihedral positions below 3.0 m, the errors induced by multipath at 95 GHz were between 0.13 deg. to -0.20 deg. for snow and ice and between 0.07 deg. to -12.0 deg. for grass. the maximum angular errors at 140 GHz under the same conditions were between 0.10 deg. and 0.20 deg. and between 0.04 deg. and -0.10 deg., respectively.

Subject Categories:

  • Active and Passive Radar Detection and Equipment
  • Target Direction, Range and Position Finding
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE