VELOCITY MEASURING SYSTEM EMPLOYING MODULATED LIGHT DOPPLER TECHNIQUES

Abstract

A high accuracy, wide band velocity measuring system is described employing modulated light Doppler techniques. The system measures the sled velocity at the Holloman Track. A Kerr cell operating on the 4th harmonic of a 7.5 mc modulating voltage is employed as a light modulator. The Doppler information is carried on the 30 mc modulation; a process of frequency multiplication of the received signal allows the velocity averaging distance to be reduced from one-half wavelength (5 meters) to 5 cm. After data reduction the system is capable of measuring the velocity of the sled to 1 part in 100,000 with a 50 c bandwidth. This accuracy is maintained for all sled velocities from 10 meters per second to above 5000 feet per second. A reduction in bandwidth to 25 c allows this range of measurements to be xt nded down to 2.5 meters per second. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1961
Accession Number
AD0266448

Entities

People

  • Ronald A. Emerling

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Bandwidth
  • Cells
  • Data Reduction
  • Frequency
  • Kerr Cells
  • Measurement
  • Modulation
  • Modulators
  • Optical Modulators

Readers

  • Inertial Navigation Systems.
  • Optical Physics and Photonics.
  • Radar Systems Engineering.