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:
Jan. 17, 1984
Filed:
Mar. 09, 1981
Jean-Pierre Tomasi, Velizy, FR;
U.S. Philips Corporation, New York, NY (US);
Abstract
44A radar arrangement (1) suitable for measuring the horizontal velocity v of an aircraft relative to the ground (2) comprises an high-frequency signal generator (10) including a transmitting aerial (9), a receiver including two aerials (12, 11) spaced a distance d apart along a line in the direction of the velocity to be measured and respective mixers (30, 31) and filters (32, 33), and a correlator (15) which determines the value (.tau.=d/v) of the delay of the signals received at the rearmost aerial (11) relative to those received at the foremost (12) for which the correlation is a maximum. The signal generator (10) generates two linearly frequency-modulated waves (E2, E1) and is controlled by the correlator (15) so that the interval between E2 and E1 equals .tau.. The height H of the aircraft can also easily be determined, being directly proportional to the beat frequency at the output of the filters (32, 33).