Accession Number : AD0781787

Title :   Radar Signature Studies Applicable to Bird-Aircraft Collision Avoidance.

Descriptive Note : Final rept. 18 Jun 70-15 Nov 73,

Corporate Author : COLORADO UNIV BOULDER

Personal Author(s) : Flock,Warren L.

Report Date : JUN 1974

Pagination or Media Count : 65

Abstract : As a continuation of previous studies of the bird-aircraft collision hazard, the modulation of radar echo amplitude due to the wingbeat of birds was investigated. For this purpose, a GEC-AEI No. 654 radar, a PrincetON Model CW-1 Boxcar Integrator, a Brush 220 paper-chart recorder, a cassette magnetic-tape recorder, and digital processing equipment have been utilized. Amplitude variations recorded on paper chart often allow quick and unambiguous estimates of bird size and type. The data indicate that it is possible to make such determinations when numbers of birds of different types are contributing to the radar echoes. The data were obtained by using a fixed radar beam and letting birds fly through the beam. Recorded wingbeat frequencies range from 2.5 Hz as a lower limit to about 30 Hz. The higher frequencies generally are due to insects rather than birds. In addition to reporting the data obtained, the capabilities of various radars, including coherent and incoherent pulse doppler and CW radars, are considered. (Modified author abstract)

Descriptors :   *Radar signatures, *Collisions, *Bird strikes, *Aviation safety, Digital systems, Processing equipment, Amplitude, Radar reflections, Coherent radar, Continuous wave radar, Doppler radar

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE