# US 2019/0170856 A1 · Radar device, signal processor, signal processing method, and mobile object > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170856 A1 - Document ID: US20190170856A1 - Status: Published application - Kind: A1 - Application number: 16/306,050 - Filed: 2017-05-25 - Published: 2019-06-06 - Earliest claimed: 2016-07-19 - Assignees: Sony Semiconductor Solutions Corporation - Applicants: Sony Semiconductor Solutions Corporation - Inventors: Sachio IIDA; Kenichi KAWASAKI - Web page: https://patentgrep.com/patent/US20190170856A1 ## CPC - G01S 7/35: Details of non-pulse systems - G01S 7/038: {Feedthrough nulling circuits} - G01S 7/354: {Extracting wanted echo-signals (Doppler systems G01S13/50)} - G01S 13/34: using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal - G01S 13/343: {using sawtooth modulation} - G01S 13/931: of land vehicles - G01S 13/87: Combinations of radar systems, e.g. primary radar and secondary radar - G01S 2013/93271: {in the front of the vehicles} - G01S 2013/93272: {in the back of the vehicles} - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract To provide a radar device, capable of eliminating the influence based on the local feedthrough in the FMCW radar device. There is provided a radar device including: an oscillator configured to oscillate a local signal; a transmitting antenna configured to emit a transmission signal based on the local signal; a receiving antenna configured to receive a reflected wave in which the transmission signal is reflected from a target; a mixer configured to multiply the reflected wave and the local signal by each other to produce a multiplied signal; and a first shifter provided between the oscillator and the mixer and configured to shift a phase of the local signal. ## Claims ### Claim 1 A radar device comprising: an oscillator configured to oscillate a local signal; a transmitting antenna configured to emit a transmission signal based on the local signal; a receiving antenna configured to receive a reflected wave in which the transmission signal is reflected from a target; a mixer configured to multiply the reflected wave and the local signal by each other to produce a multiplied signal; and a first shifter provided between the oscillator and the mixer and configured to shift a phase of the local signal. ### Claim 2 (depends on 1) The radar device according to claim 1, further comprising: a second shifter configured to shift a phase of a signal output by the first shifter between the first shifter and the transmitting antenna. ### Claim 3 (depends on 1) The radar device according to claim 1, wherein the first shifter sets a shift amount to a first value at first-time transmission of the transmission signal and sets the shift amount to a second value at second-time transmission of the transmission signal. ### Claim 4 (depends on 3) The radar device according to claim 3, comprising: a calculation unit configured to perform subtraction between an output of the mixer at the first-time transmission of the transmission signal and an output of the mixer at the second-time transmission of the transmission signal. ### Claim 5 (depends on 3) The radar device according to claim 3, wherein a difference between the first value and the second value is approximately 180 degrees. ### Claim 6 (depends on 3) The radar device according to claim 3, wherein a difference between the first value and the second value is within a range of 180 degrees±22.5 degrees. ### Claim 7 (depends on 1) The radar device according to claim 1, further comprising: a multiplier configured to multiply a frequency of a signal output by the first shifter by N times between the first shifter and the mixer. ### Claim 8 (depends on 7) The radar device according to claim 7, comprising: a calculation unit configured to perform subtraction between an output of the mixer at first-time transmission of the transmission signal and an output of the mixer at second-time transmission of the transmission signal. ### Claim 9 (depends on 7) The radar device according to claim 7, wherein the first shifter sets a shift amount to a first value at first-time transmission of the transmission signal and sets the shift amount to a second value at second-time transmission of the transmission signal, and a difference between the first value and the second value is a value which becomes approximately 180 degrees when the difference is multiplied by N times and wrapped at 360. ### Claim 10 (depends on 7) The radar device according to claim 7, wherein the first shifter sets a shift amount to a first value at first-time transmission of the transmission signal and sets the shift amount to a second value at second-time transmission of the transmission signal, and a difference between the first value and the second value is within a range of 180 degrees±22.5 degrees when the difference is multiplied by N times and wrapped at 360. ### Claim 11 (depends on 1) The radar device according to claim 1, further comprising: a multiplier configured to multiply a frequency of a signal output by the oscillator by N times between the oscillator and the first shifter. ### Claim 12 (depends on 1) The radar device according to claim 1, wherein the local signal is a signal whose frequency increases or decreases with time. ### Claim 13 (depends on 12) The radar device according to claim 12, wherein the local signal is a signal whose frequency linearly increases or decreases with time. ### Claim 14 A signal processor comprising: an oscillator configured to oscillate a local signal; a mixer configured to multiply a reflected wave in which a transmission signal based on the local signal is reflected from a target and the local signal by each other to produce a multiplied signal; and a first shifter provided between the oscillator and the mixer and configured to shift a phase of the local signal. ### Claim 15 A signal processing method comprising: oscillating, by an oscillator, a local signal; emitting a transmission signal based on the local signal from a transmitting antenna; receiving, by a receiving antenna, a reflected wave in which the transmission signal is reflected from a target; multiplying, by a mixer, the reflected wave and the local signal by each other to produce a multiplied signal; and shifting, by a shifter provided between the oscillator and the mixer, a phase of the local signal. ### Claim 16 (depends on 1) A mobile object comprising: the radar device according to claim 1.