Accession Number : ADD008228

Title :   A Dual Channel Correlator for an FM-CW Ranging Radar.

Descriptive Note : Patent Application,


Personal Author(s) : Parkhurst,Ross A ; Rodkey,David L ; Wedel,John O

Report Date : 14 Oct 1980

Pagination or Media Count : 21

Abstract : This abstract discloses a method and apparatus for eliminating the sidelobe ambiguity in the range response of an FM-CW radar. An FM-CW signal with a periodic modulation frequency is transmitted and reflected from a target, received and combined with a sample of the transmitted signal to provide a combustion signal. A portion of this combination signal including a selected harmonic and next adjacent harmonic is amplified and mixed with reference signals comprising the selected harmonic and next adjacent harmonic to provide two separate difference signals. These signals are in turn low pass filtered and further mixed to provide a range response with a mainlobe of one polarity and all side lobes of an opposite polarity. The energy under the mainlobe is detected and integrated to provide a voltage signal. When this voltage signal reaches a preset threshold level a further signal is generated.

Descriptors :   *Patent applications, *Continuous wave radar, *Harmonic generators, *Frequency modulation, *Range finding, Dual channel, Continuous waves, Finite difference theory, Threshold effects, Range(Distance), Voltage, Response, Sidelobes, Modulation, Probability, Frequency, Radar, Correlators, Signals

Subject Categories : Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE