Multisite Acoustic Location,
Abstract
Two acoustic arrays 10 km apart are used to locate a sub-sonic aircraft in the horizontal plane. The arrays measure azimuth of sound from the aircraft. If the latter is flying very slowly, it is located at the intersection of straight lines drawn from the sensors in the direction of the azimuths measured at the time the plane is to be located. If the plane is flying faster, the straight lines become curved because of the finite speed of sound, and measurements made over intervals of time must be used instead of measurements made at a single time. But the general picture remains very much the same. The effects of azimuth errors ae similar for slow and fast aircraft, though geometrical diagrams relating error magnitude to aircraft location distort as the aircraft velocity changes. Aircraft height, which causes no error for very slow aircraft, causes only small errors for fast aircraft flying below 1 km. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1978
- Accession Number
- ADP003793
Entities
People
- Rebecca L. Walton
Organizations
- Massachusetts Institute of Technology