Accession Number : AD0617932

Title :   VISTAR FIELD ENGINEERING.

Descriptive Note : Final rept. for 1 Jan 64-31 Mar 65,

Corporate Author : MOTOROLA INC SCOTTSDALE ARIZ MILITARY ELECTRONICS DIV

Personal Author(s) : Bretzel,H. ; Klinzer,G.

Report Date : 30 APR 1965

Pagination or Media Count : 65

Abstract : The VISTAR program history is outlined, indicating the early objectives to modify a previously-constructed X-band, pulse Doppler radar for airborne weather analysis. The extreme difficulties in securing a modulator with the high pulse repetition frequencies (3500-7000 pps) for the 50 kilowatt peak power klystron amplifier are noted, which eventually led to a modification in program plans to include ground operation only. Transmitter/receiver modifications and data processor work are presented. Circuit diagram corrections and additions are given and a set of subassembly identification pictures are included. Complete circuit schematics and theory of operation are not part of this report. Appendix 1 outlines an alternate approach to the airborne radar instrumentation. A hih duty cycle, low peak power (120 watts), half-microsecond magnetron transmitter is used to reduce weight. Coherence is established in the receiver via delay-line storage of the transmitter pulse, heterodyned to an i-f frequency (55 Mc). Tape recording of the Doppler spectrum at 25 range intervals provides the history necessary for spectral analysis on the ground after flights. An antenna that employs electromechanical stabilization of the beam to compensate for pitch motion of the aircraft is discussed. (Author)

Descriptors :   (*DOPPLER RADAR, METEOROLOGICAL RADAR), (*METEOROLOGICAL RADAR, AIRBORNE), (*COHERENT RADAR, METEOROLOGICAL RADAR), X BAND, RADAR TRANSMITTERS, RADAR RECEIVERS, WIRING DIAGRAMS, RADAR PULSES, DATA PROCESSING

Distribution Statement : APPROVED FOR PUBLIC RELEASE