US 12,379,488 B2
Radar device, vehicle, and method of estimating number of incoming waves
Ryo Saito, Nagaokakyo (JP); Katsuhisa Kashiwagi, Nagaokakyo (JP); Nobuya Arakawa, Nagaokakyo (JP); and Koichi Ichige, Kanagawa (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Oct. 11, 2022, as Appl. No. 17/963,220.
Application 17/963,220 is a continuation of application No. PCT/JP2021/014911, filed on Apr. 8, 2021.
Claims priority of application No. 2020-074296 (JP), filed on Apr. 17, 2020.
Prior Publication US 2023/0030969 A1, Feb. 2, 2023
Int. Cl. G01S 13/931 (2020.01); G01S 13/42 (2006.01)
CPC G01S 13/931 (2013.01) [G01S 13/42 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radar device comprising:
an oscillator configured to generate a transmission signal including a plurality of chirp signals, the chirp signal having a frequency that is increasing or decreasing from an initial frequency in each predetermined sweep cycle, the oscillator being able to change the initial frequency of each chirp signal;
a transmitter configured to emit the transmission signal;
a receiver configured to receive a reflected wave of the transmission signal reflected at an object and an unwanted wave as a reception signal; and
circuitry configured to:
estimate a phase of the reception signal from the transmission signal and the reception signal;
calculate a correlation between a change pattern of the initial frequency of each chirp signal and a change pattern of the phase of the reception signal;
estimate the reflected wave from the reception signal based on the correlation; and
calculate a number of incoming waves based on a result of the estimation of the reflected wave.