CONTACT-FREE DISTANCE MEASUREMENT BY MEANS OF A STATIC TEST SIGNAL,
Abstract
The article describes and discusses the method of contactless distance measurement by using noise as the test signal. This differs from the well known reflection method in that a suitably selected statistical signal is transmitted; the delay-time information is retrieved in the correlator. The complete block diagram shows the operation of the measuring apparatus. The basic principle is explained by a simplified block diagram according to which a noise generator with a form filter feeds into an electro-acoustic component (earth surface) and also into a compensation-delay time component; the outputs from both pass through operational amplifiers into the appropriate metering instruments. The selection of the transmitter spectrum and the effect of the directly received signal are discussed. The static error is calculated analytically but some typical numerical values are also given. The dynamic error is not considered here. Some actual measurements are described together with the problems encountered.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 16, 1967
- Accession Number
- AD0824854
Entities
People
- F. H. Lange
- W. T. Mueller
Organizations
- National Air and Space Intelligence Center