FEASIBILITY TEST MODEL ELECTRO-OPTICAL MISS DISTANCE SYSTEM.
Abstract
A feasibility model was built and tested to demonstrate accurate distance measurement using a CW modulated light beam. The distance measurement is based upon the comparison of the phase of the transmitted signal with the phase of that same signal returned from a target. The important features proven in this development are (1) Ranging Accuracies; (2) Ambiguity resolution using multiple ranging tones; and (3) Absolute range measurement in the presence of doppler. To perform the prescribed task and prove the feasibility of the approach under laboratory conditions an incoherent light source (GaAs Diode), coaxial optics, corner reflector, and a photomultiplier are used for the optical link. The CW modulation tones, 5 Mc and 40 Mc, give an unambiguous range of 3,000 centimeters for the coarse range channel and 375 centimeters for the fine range channel. By the use of phase locked loops and binary divider circuits coherent offset phase references are generated, thereby allowing the translations of the high frequency phase information to a low frequency phase carrier. A small data processor takes instantaneous range readings derived from the phase delay in the received signals compared to the phase of the reference signal and performs ambiguity resolution.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1966
- Accession Number
- AD0801386
Entities
People
- E. R. Marcusen
- M. L. Shechet
Organizations
- ITT Corporation