US 12,306,330 B2
Radar device and vehicle equipped with same
Nobuya Arakawa, Kyoto (JP); and Katsuhisa Kashiwagi, Kyoto (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on Sep. 21, 2021, as Appl. No. 17/480,811.
Application 17/480,811 is a continuation of application No. PCT/JP2020/011307, filed on Mar. 13, 2020.
Claims priority of application No. 2019-054993 (JP), filed on Mar. 22, 2019; and application No. 2019-181880 (JP), filed on Oct. 2, 2019.
Prior Publication US 2022/0003833 A1, Jan. 6, 2022
Int. Cl. G01S 7/03 (2006.01); G01S 7/02 (2006.01); G01S 7/40 (2006.01); G01S 13/931 (2020.01)
CPC G01S 7/038 (2013.01) [G01S 7/028 (2021.05); G01S 7/40 (2013.01); G01S 13/931 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A radar device comprising:
a transmission signal generator configured to generate a transmission signal;
a transmission antenna configured to transmit the transmission signal generated by the transmission signal generator as a transmitted wave;
a reception antenna configured to receive a reflected wave generated as a result of the transmitted wave hitting and being reflected by an object;
a mixer circuit configured to mix the transmission signal transmitted by the transmission antenna and a reception signal received by the reception antenna, and to convert the transmission and reception signals into an intermediate frequency signal;
a radome configured to protect the device;
a correction data storage configured to store in advance a difference between a when-attached intermediate frequency signal and a when-not-attached intermediate frequency, the when-attached intermediate frequency signal being obtained by the mixer circuit when the radome is attached to the device and the when-not-attached intermediate frequency signal being obtained by the mixer circuit when the radome is not attached to the device; and
at least one controller configured to:
determine a phase shift amount of the intermediate frequency signal obtained by the mixer circuit caused by a device temperature,
subtract the difference stored in advance in the correction data storage from the intermediate frequency signal obtained by the mixer circuit when measuring the object, and
when performing the subtraction, correct a phase of a result of the subtraction by the determined phase shift amount,
wherein the when-attached intermediate frequency signal is obtained by mixing the transmission signal with the received signal that includes a transmission wave component of a transmission wave that is transmitted and leaked from the transmission antenna to the reception antenna, in the mixer circuit when the radome is attached to the device, and
wherein the determined phase shift amount corresponds to the difference between a phase of the intermediate frequency signal obtained by the mixer circuit when measuring the object and a phase of the when-attached intermediate frequency signal.