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US 2021/0063558 A1Published application
Radar device
AssigneeMitsubishi Electric Corporation
InventorsKazuhide HIGUCHI, Jun SHIMOKAWATOKO, Hiroyuki MIZUTANI, Kenichi TAJIMA
Life of this patent
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Abstract
The radar device is provided with a distance calculation unit that calculates a distance correspondence value corresponding to the distance to a target from a digital signal converted by a beat signal detection unit, and calculates the distance to the target from the distance correspondence value.
Claims6
A radar device comprising:
- processing circuitry to
- generate a radar signal whose frequency changes, over time, nonlinearly with respect to the time;
- output the generated radar signal as a reference wave, transmit the radar signal to a target, and receive a returning radar signal reflected from the target as a reflected wave;
- detect a beat signal indicating a difference frequency between a frequency of the output reference wave and a frequency of the received reflected wave, and convert the beat signal into a digital signal from an analog signal;
- and
- calculate a distance correspondence value corresponding to the distance to the target from the converted digital signal and calculate the distance to the target from the distance correspondence value;
- calculate an amount of change over time of a frequency indicated by the converted digital signal;
- calculate an absolute value of the calculated amount of change as the distance correspondence value corresponding to the distance to the target;
- and
- calculate the distance to the target from the calculated absolute value.
7 more elements
A radar device comprising:
- processing circuitry to
- generate a radar signal whose frequency changes, over time, nonlinearly with respect to the time;
- output the generated radar signal as a reference wave, transmit the radar signal to a target, and receive a returning radar signal reflected from the target as a reflected wave;
- detect a beat signal indicating a difference frequency between a frequency of the output reference wave and a frequency of the received reflected wave, and convert the beat signal into a digital signal from an analog signal;
- and
- calculate a distance correspondence value corresponding to the distance to the target from the converted digital signal and calculate the distance to the target from the distance correspondence value,
- generate, as a replica signal of the digital signal, a signal having a sampling period same as a sampling period of the beat signal upon conversion of the beat signal from an analog signal into the digital signal;
- calculate an inner product of the converted digital signal and the generated replica signal;
- calculate, as the distance correspondence value corresponding to the distance to the target, an absolute value of the calculated inner product;
- and
- calculate the distance to the target from the calculated absolute value.
8 more elements
A radar device comprising:
- processing circuitry to
- generate a radar signal whose frequency changes, over time, nonlinearly with respect to the time;
- output the generated radar signal as a reference wave, transmit the radar signal to a target, and receive a returning radar signal reflected from the target as a reflected wave;
- detect a beat signal indicating a difference frequency between a frequency of the output reference wave and a frequency of the received reflected wave, and convert the beat signal into a digital signal from an analog signal;
- and
- calculate a distance correspondence value corresponding to the distance to the target from the converted digital signal and calculate the distance to the target from the distance correspondence value,
- convert the beat signal that is defined as a first beat signal into a first digital signal from an analog signal and convert a second beat signal that is delayed in phase by 90 degrees with respect to the first beat signal into a second digital signal from an analog signal, and
- the processing circuitry further
- generates, as a first replica signal of the first digital signal, a signal having a same sampling period as a sampling period of the first beat signal upon conversion of the first beat signal into the first digital signal from an analog signal, and generates, as a second replica signal of the second digital signal, a signal having the sampling period, and generates a complex replica signal that is a complex signal from the first replica signal and the second replica signal;
- generates a complex digital signal that is a complex signal from the first digital signal and the second digital signal and calculates a cross-correlation between the complex digital signal and the complex replica signal;
- calculates, as the distance correspondence value corresponding to the distance to the target, an absolute value of the calculated cross-correlation;
- and
- calculates the distance to the target from the calculated absolute value.
10 more elements
Dependencies are inferred from the claim text.