US 7,843,381 B2 · Radar device

Abstract

A radar device of FM pulse system, in which a pulsed radio wave with frequency modulated is transmitted or received, to calculate a distance to a target 203 and a relative velocity, comprising: range gate setting means 205 for determining a sampling timing every time a predetermined time period has passed from a transmission timing; sampling means 206 for making a sampling in a frequency up zone or frequency down zone in each range gate; and measurement time changing means 207 for setting a measurement data used as an input of Fourier transform based on sampling data obtained by the sampling means 206, and when letting a time period required to make a sampling of all measurement data a measurement time period, changing the measurement time period in each range gate. An optimum distance resolution and relative velocity resolution can be set based on the distance to a target.

Claims23

Dependent claims

A radar device of FM pulse system including:

frequency modulation means for making a frequency modulation of a frequency of a transmission radio wave with a modulation signal of a triangular wave;
transmission means for generating a pulsed signal of which frequency has been modulated by said frequency modulation means, and transmitting the pulsed signal to a target as a transmission pulse signal;
receiving means for receiving a signal having been reflected at said target as a received pulse signal, and generating a beat signal from a frequency difference between a part of the transmission radio wave of which frequency has been modulated and the received pulse signal;
and distance and relative velocity calculation means for calculating a distance to said target and a relative velocity with the beat signal generated by said receiving means;
the radar device comprising:
range gate setting means for setting a range gate that determines a sampling timing of said received pulse signal at intervals of a predetermined time period based on a transmission timing of said transmission pulse signal;
sampling means for sampling said received pulse signal in a frequency up zone or in a frequency down zone of said frequency modulated signal in each range gate set by the mentioned range gate setting means;
and
measurement time changing means for setting a measurement data used as an input of Fourier transform based on sampling data obtained by said sampling means, and when a time period for sampling of all measurement data is a measurement time period, changing said measurement time period in each range gate.

6 more elements

Dependencies are inferred from the claim text.

Radar device

Life of this patent

Radar device

Life of this patent

Abstract

Claims23