Radar device, signal processing device and signal processing method for radar device
First Claim
1. A radar device comprising:
- a transmitter configured to transmit a transmission signal in which an up period in which the frequency increases and a down period in which the frequency are repeated;
a receiver configured to receive the reflected waves of the transmission signal from a target, as reception signals; and
a processor configured to execute a program to;
compute the distance between the target and the radar device based on a reception signal corresponding to the up period, as an up-side distance, and compute the distance between the target and the radar device based on a reception signal corresponding to the down period, as a down-side distance;
determine whether velocity aliasing has occurred, on the basis of the up-side distance and the down-side distance; and
compute the relative velocity between the target and the radar device, on the basis of the result of determination on velocity aliasing, and at least one of the reception signal corresponding to the up period and the reception signal corresponding to the down period.
1 Assignment
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Accused Products
Abstract
There is provided a radar device. A transmitting unit transmits a transmission signal in which an up period and a down period are repeated. A receiving unit receives reception signals from a target. A distance measuring unit computes the distance between the target and the radar device based on a reception signal corresponding to the up period, as an up-side distance, and computes the distance between the target and the radar device based on a reception signal corresponding to the down period, as a down-side distance. An aliasing determining unit determines whether velocity aliasing has occurred, based on the up-side distance and the down-side distance. A velocity measuring unit computes the relative velocity between the target and the radar device, based on the result of determination on velocity aliasing, and one of the reception signal of the up period and the reception signal of the down period.
14 Citations
5 Claims
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1. A radar device comprising:
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a transmitter configured to transmit a transmission signal in which an up period in which the frequency increases and a down period in which the frequency are repeated; a receiver configured to receive the reflected waves of the transmission signal from a target, as reception signals; and a processor configured to execute a program to; compute the distance between the target and the radar device based on a reception signal corresponding to the up period, as an up-side distance, and compute the distance between the target and the radar device based on a reception signal corresponding to the down period, as a down-side distance; determine whether velocity aliasing has occurred, on the basis of the up-side distance and the down-side distance; and compute the relative velocity between the target and the radar device, on the basis of the result of determination on velocity aliasing, and at least one of the reception signal corresponding to the up period and the reception signal corresponding to the down period. - View Dependent Claims (2, 3)
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4. A signal processing device for a radar device, comprising:
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a receiver configured to receive the reflected waves of a transmission signal in which an up period in which the frequency increases and a down period in which the frequency are repeated, from a target, as reception signals, and compute the distance between the target and the radar device based on a reception signal corresponding to the up period, as an up-side distance, and compute the distance between the target and the radar device based on a reception signal corresponding to the down period, as a down-side distance; and a processor configured to execute a computer program to; determine whether velocity aliasing has occurred, on the basis of the up-side distance and the down-side distance; and compute the relative velocity between the target and the radar device, on the basis of the result of determination on aliasing, and at least one of the reception signal corresponding to the up period and the reception signal corresponding to the down period.
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5. A signal processing method for a radar device, comprising:
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receiving the reflected waves of a transmission signal in which an up period in which the frequency increases and a down period in which the frequency are repeated, from a target, as reception signals, and computing the distance between the target and the radar device based on a reception signal corresponding to the up period, as an up-side distance, and computing the distance between the target and the radar device based on a reception signal corresponding to the down period, as a down-side distance; determining whether velocity aliasing has occurred, on the basis of the up-side distance and the down-side distance; and computing the relative velocity between the target and the radar device, on the basis of the result of determination on aliasing, and at least one of the reception signal corresponding to the up period and the reception signal corresponding to the down period.
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Specification