Radar device

摘要

A first radar transmitter and a second radar transmitter transmit a first modulation signal and a second modulation signal which are generated by repeating a predetermined time of code sequences, each of which has a predetermined code length, using a first code width and a second code width, respectively. An A/D converter converts the modulation signal into a discrete signal in a sampling cycle shorter than a difference between the first code width and the second code width. A positioning section separates a plurality of reception signals using a first correlation value based on outputs from the A/D converter and a first delay section corresponding to the first code width and a second correlation value based on outputs from the A/D converter and a second delay section corresponding to the second code width.

主权项

1. A radar device comprising:
a first radar transmitter including:
first transmission signal generating circuitry which, in operation, generates a first modulation signal in which a predetermined number of code sequences are repeated using a first code width, each code sequence having a predetermined code length; andfirst transmission radio frequency (RF) circuitry which, in operation, converts the first modulation signal into a first RF radar transmission signal and transmits the first radar transmission signal from a first transmission antenna; and a second radar transmitter including:
second transmission signal generating circuitry which, in operation, generates a second modulation signal in which a predetermined number of code sequences are repeated using a second code width, each code sequence having the predetermined code length;second transmission RF circuitry which, in operation, converts the second modulation signal into a second RF radar transmission signal and transmits the second radar transmission signal from a second transmission antenna; and one or more radar receivers including:
reception RF circuitry which, in operation, converts a RF reflected wave signal received by a reception antenna into a baseband signal and performs quadrature detection for the converted baseband signal;analog to digital (A/D) converting circuitry which, in operation, samples the quadrature-detected baseband signal in a sampling cycle;first delay circuitry which, in operation, delays an output signal from the A/D converting circuitry by a predetermined number of samples corresponding to the first code width;first correlation value calculating circuitry which, in operation, calculates a first correlation value based on the output signal from the A/D converting circuitry and an output signal from the first delay circuitry;second delay circuitry which, in operation, delays the output signal from the A/D converting circuitry by a predetermined number of samples corresponding to the second code width; andsecond correlation value calculating circuitry which, in operation, calculates a second correlation value based on the output signal from the A/D converting circuitry and an output signal from the second delay circuitry.