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:
Aug. 24, 1999
Filed:
Nov. 18, 1997
Dean L Shollenberger, Townsend, MA (US);
Raytheon Company, Lexington, MA (US);
Abstract
A radar system for processing a series of radar returns to determine Doppler velocity of an object. Each one of the radar returns is produced in response the object reflecting each one of a series of transmitted radar pulses. The series of radar returns is processed in a sequence of successive dwells. Each one of the dwells has a predetermined number of radar returns. The radar system includes a system clock for producing a series of clock pulses. A range gate is provided for sampling each one of a series of radar returns produced in response to a each one of a series of transmitted radar pulse. The range gate has a time duration equal to an integer number of, N, clock pulse periods. A range gate positioning system initiates the range gate a selected time, .DELTA., after each one of the transmitted pulses. The positioning system determines the selected time, .DELTA., as an integer number of, M, clock pulse periods for a predetermined number of transmitted pulses and then subsequently changes such integer M to a different integer number, M'. More particularly, the range gate positioning system determines the integer number, M, in accordance with a predetermined fractional offset, .delta., of a clock pulse period, T, of the position of an object within the clock pulse period, T, from a predetermined desired position within the clock pulse period, T, and the integer M' being determined in accordance with the Doppler velocity of the object. The range gate positioning system determines M' is accordance with the number of PRIs per clock pulse period the object moves relative to the radar system) and determines M in accordance with M=�1-(.delta./T)!M'.