Accession Number : AD0419878

Title :   PROJECT VANGUARD REPORT NO. 23 MINITRACK REPORT NO. 3, RECEIVER SYSTEM.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Simas,V. R. ; Bartholomew,C. A.

Report Date : 06 DEC 1957

Pagination or Media Count : 27

Abstract : The Minitrack system is designed to acquire and track artificial earth satellites which Project Vangaurd will attempt to place in orbits as part of the United States' effort in the International Geophysical Year. The satellites will be provided with 108-Mc signal sources to illuminate the tracking stations. These sources will radiate sufficient power to permit the desired tracking accuracy. The Minitrack system functions as a radio interferometer, providing the direction cosines of a satellite's position vector with respect to the tracking stations at any given instant during a transit. The receiving equipment must amplify the signals obtained from the satellites via interferometer antenna pairs, with the introduction of a minimum of noise and differertial phase shift, and by means of a unique double-localoscillator principle translate this intelligence to a frequency readily adaptable to phase measurement. This report describes, with schematics, the five units comprising a single rf channel, i.e., a pair of front ends, a signal adder, a combined i-f amplifier, a special local oscillator, and a calibration source. (Author)

Descriptors :   *ARTIFICIAL SATELLITES, *RADIO INTERFEROMETERS, TRACKING, ARTIFICIAL SATELLITES, TRACKING, SCIENTIFIC SATELLITES, PHASE MEASUREMENT, DISTORTION, ANTENNAS, VERY HIGH FREQUENCY, POSITION FINDING, OSCILLATORS, ENGINEERING DRAWINGS, CALIBRATION, INTERMEDIATE FREQUENCIES, AMPLIFIERS, CIRCUITS, RADIO RECEIVERS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE