US 2003/0151544 A1 · Radar

Abstract

A radar device precisely detects a target in short time intervals by detecting a true peak frequency with high accuracy via a calculation which does not require a large amount of computation. A discrete frequency spectrum of a beat signal multiplied by a window function is determined, and values of signal strength at two discrete frequencies which are, respectively, higher and lower than a peak frequency of the discrete frequency spectrum of the beat signal and which are adjacent to the peak frequency. The frequency difference between the discrete peak frequency of the beat signal and the peak frequency of the window function is then determined from the ratio between the values of signal strength at those two discrete frequencies adjacent to the peak frequency. Thus, the true peak frequency of the beat signal is determined with a high frequency resolution.

Claims19

Dependent claims

A radar device for detecting a target from a peak frequency of a beat signal, comprising:

an RF block for transmitting a frequency-modulated transmission signal and generating a beat signal between a portion of the transmission signal and a signal reflected from the target;
and
a signal processing block for determining a discrete frequency spectrum for the beat signal multiplied by a window function and for determining the peak frequency of the beat signal from the discrete frequency spectrum;
wherein
the signal processing block determines the true peak frequency of the beat signal by performing a process including the steps of fitting the frequency spectrum of the window function to the discrete frequency spectrum of the beat signal, determining the peak frequency of the window function fit to the discrete frequency spectrum of the beat signal, and using the peak frequency of the window function as the true peak frequency of the beat signal.

2 more elements

Dependencies are inferred from the claim text.

Radar

Life of this patent

Radar

Life of this patent

Abstract

Claims19