Patent ID: 7746270
Filing Date: 2010-06-29
Classification: G01S

Abstract:
1. A radar apparatus capable of transmitting a pulse signal including pulses having pulselengths assigned to at least two range scales and receiving a returning echo signal through a single antenna, said radar apparatus comprising: a range scale selector for specifying said at least two range scales on which radar pictures are displayed; a transmitter for generating the pulse signal having the pulselengths assigned to the individual range scales according to a specific transmit pulse pattern, wherein the pulse signal has a frequency that changes as a result of changes is said pulselengths; a receiver for down-converting the received echo signal using a local oscillation frequency; a tuning voltage setting timing generator for generating a tuning voltage setting timing according to said transmit pulse pattern; and a tuning processor for controlling the local oscillation frequency by altering a tuning voltage based on transmitting frequency deviation that occurs as a result of pulselength alteration according to said tuning voltage setting timing, the radar apparatus further comprising a tuning voltage alteration decider for deciding whether or not to alter the tuning voltage based on a combination of alternate pulselengths before and after altering the pulselength of the transmitted pulse signal, wherein said tuning processor performs operation for altering the tuning voltage based on the result of decision made by said tuning voltage alteration decider.