Accession Number : AD0479666

Title :   CONTINUOUS-TRANSMISSION FREQUENCY-MODULATED SONAR RANGE AND RANGE-RATE EQUATIONS.

Descriptive Note : Research rept. Jul 63-Aug 65,

Corporate Author : NAVY ELECTRONICS LAB SAN DIEGO CA

Personal Author(s) : Smothers, L. A.

Report Date : 15 DEC 1965

Pagination or Media Count : 34

Abstract : Range and range-rate equations are developed for CTFM sonar. Consideration is given to the exact round-trip distance traveled by the sonar signal and to the doppler effect. Approximate equations are developed for range rates of -40 knots with typical range errors of 0.1, 5.49, and 90.87 percent and typical range-rate errors of 0.22 and 7.44 percent. Partial derivatives are taken of the approximate equations. Figures show range parameters, range as a function of the difference (audio) frequency for two range scales and various range rates (using the exact range equation), and the percentage of error in range and range rate as a function of their variables. Computer-generated solutions of the derived range equation are included in an appendix. (Author)

Descriptors :   *SONAR SIGNALS, RANGE(DISTANCE), SONAR EQUIPMENT, ERRORS, SOUND TRANSMISSION, UNDERWATER SOUND, DOPPLER SYSTEMS, DOPPLER EFFECT.

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE