Accession Number : AD0709409

Title :   THE MEASUREMENT OF POINT TARGET SPEEDS WITH INCOHERENT NON-TRACKING RADAR: INSECT SPEEDS IN ATMOSPHERIC WAVES.

Descriptive Note : Technical rept.,

Corporate Author : CHICAGO UNIV ILL LAB FOR ATMOSPHERIC PROBING

Personal Author(s) : Atlas,David ; Harris,F. Ian ; Richter,Juergen H.

Report Date : 01 APR 1970

Pagination or Media Count : 38

Abstract : A non-doppler method for the determination of the horizontal speeds of point targets crossing a circular radar beam is presented. It requires knowledge only of the range, the relative signal intensity variation with time, and the beam width of the radar. Dot angels, assumed to be insects, with observed 10 cm cross-sections of .00001 to .001 cm squared are found to have speeds from 0.9 to 5.0 m/sec. The high range resolution also permits accurate determination of the target vertical velocities from the time derivative of their height. Vertical velocities were found to range from -0.86 m/sec to +0.75 m/sec. The variation in both vertical and horizontal insect speeds of a selected group of insects correlates very well with the simultaneously observed radar heights of an atmospheric wave at about the same altitude as the insects. Due to a phasing difference it is concluded that the insects are moving in a direction opposite that of the wave perturbation. (Author)

Descriptors :   (*SEARCH RADAR, RADAR TARGETS), (*INSECTS, RADAR SIGNALS), (*RADAR TARGETS, VELOCITY), INCOHERENT SCATTERING, ATMOSPHERIC MOTION, RANGE(DISTANCE), INTENSITY

Subject Categories : Biology
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE