Patent ID: 6674395
Filing Date: 2004-01-06
Classification: G01S

Abstract:
A radar system comprising:a transmitting/receiving unit for repeatedly transmitting a triangular transmission signal including a frequency-gradually-rising up-modulation interval and a frequency-gradually-dropping down-modulation interval and for receiving a reception signal including a reflected signal from a target, the transmitting/receiving unit having a voltage controlled oscillator for determining a transmission frequency, a voltage signal for frequency modulation being supplied to the voltage controlled oscillator; a frequency analysis unit for calculating data concerning a frequency spectrum of a beat signal that has a frequency that is substantially equal to a difference between a frequency of the transmission signal and a frequency of the reception signal; a data storing unit for storing time-varying characteristics of input values to a D/A converter that monotonically change an oscillation frequency of the voltage controlled oscillator with time, in the form of data concerning an expression representing the time-varying characteristics; and a data processing unit for determining the input values to the D/A converter with reference to the data concerning an expression representing the time-varying characteristics; wherein at least one of a relative distance to the target and a relative speed of the target is detected based on the beat signal during the up-modulation interval and the beat signal during the down-modulation interval.