Patent ID: 7339517
Filing Date: 2008-03-04
Classification: G01S

Abstract:
1. A radar for detecting a target, the radar comprising: a transmitter, the transmitter transmitting a frequency modulated transmission signal; an intermediate-frequency signal generator, the intermediate-frequency signal generator generating a beat signal containing a component of a frequency equal to a difference between a frequency of a reflection signal from the target and a frequency of the transmission signal; and a digital signal processor, the digital signal processor determining a frequency spectrum of the beat signal, determining a peak frequency of a peak appearing in the frequency spectrum, setting a first threshold value based on one of intensity of background noise or intensity of the reflection signal from a target having a fixed reflection sectional area, setting a second threshold value in a fixed frequency region in the vicinity of the peak based on a plurality of additional peaks exceeding the first threshold value, and extracting the peak exceeding the second threshold value.