Accession Number : ADD008254

Title :   Homodyne Radar System.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Wallace,Harry B

Report Date : 20 Oct 1980

Pagination or Media Count : 10

Abstract : The present invention relates to homodyne radar systems and in particular to systems transmitting a frequency modulated signal wherein the modulation is discontinuous. A known radar system transmits a swept frequency output which determines range by measuring the frequency difference between the transmitted and received signals. This technique employs circuitry to either directly measure this frequency difference or modify the modulation rate to produce a predetermined frequency difference. These systems are relatively complex and require a high degree of linearity in the frequency sweeping to maintain accuracy. This requirement of linear frequency sweeping results in a relatively small frequency deviation and necessitates an antenna with a fairly low voltage-standing wave ratio (VSWR). Accordingly, there is a need for a system which takes advantages of the inherent noise immunity of a frequency modulated radar system but avoids the circuit complexities and the errors due to nonlinear frequency sweeping. (Author)

Descriptors :   *Patent applications, *Radar receivers, *Radar signals, Frequency modulation, Radar equipment, Sweep frequency techniques, Output, Rates, Inventions, Radar, Immunity, Frequency, Transmitting, Noise, Modulation, Signals, Accuracy

Subject Categories : Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE