Accession Number : AD0163833

Title :   Doppler Radar with Target Velocity Direction and Range Indication, Utilizing a Variable-Frequency Generator.

Descriptive Note : Patent,

Corporate Author : OFFICE OF THE SECRETARY OF THE ARMY WASHINGTON D C

Personal Author(s) : Rittenbach,Otto E.

Report Date : 11 JAN 1972

Pagination or Media Count : 4

Abstract : The patent describes a radar where the energy output from the CW oscillator is periodically phase shifted plus and minus 22.5 deg under the control of the output of a variable frequency square wave generator. The echo signals are combined with a sample of the transmitted signals and applied to a single mixer. A pair of Doppler signals are sequentially derived from the mixer output by means of a gate circuit operated by the square wave generator. At a certain generator frequency which depends on target range, the relative phases of the two Doppler signals will indicate the sense of direction of target movement. The generator frequency-adjusting means can be calibrated in terms of target range.

Descriptors :   (*DOPPLER RADAR, *PATENTS), TRACKING, SIGNAL GENERATORS, PHASE SHIFT CIRCUITS, DOPPLER SYSTEMS

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE