Measurements of Spectral Characteristics of Swimmer Targets and Water Return Clutter
Abstract
Doppler frequency recordings indicated that surface swimmers were detectable to a range of 30 feet or more with the CW radars at either 140 MHz or 915 MHz under calm surface conditions. However, under certain conditions, surface disturbances reduced the detection range to 10 feet or less. Underwater swimmers with SCUBA equipment were detected only at close range (10-15 feet) and under calm conditions. Pulsed operation resulted in a much higher signal-to- clutter ratio and permitted reliable detection of surface swimmers up to a 30- foot range with moderate surface activity (4 inch waves) and SCUBA equipped underwater swimmers at 30 feet under calm conditions. The signal-to-clutter ratio for the surface swimmer was sufficiently high to permit detections at several times the 30 foot ranges.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1974
- Accession Number
- AD0782127
Entities
People
- Aaron Galvin