The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 1981
Filed:
Nov. 15, 1979
Jean-Pierre Tomasi, Velizy, FR;
U.S. Philips Corporation, New York, NY (US);
Abstract
A FM-CW radar distance measuring apparatus, comprising a feedback loop having a high-frequency signal generator, a mixer device producing a beat signal between the transmitted wave and the received wave, a frequency discriminator, an integrator and a modulator which produces a sawtooth voltage for controlling the generator. The duration of the sawtooth is directly proportional to the distance to be measured. To improve the linearity of the signal to be transmitted a second (digital) feedback loop is provided, connected between the discriminator output and the modulator input and comprising the cascade arrangement of a threshold device, an adder, a store (and a digital-to-analog) converter. A distribution element connects the modulator to the store.