Radar system mounted on vehicle
To provide a radar system mounted on a vehicle that reliably detects the reception of the interference wave with high-performance and inexpensively. There is provided a radar system mounted on a vehicle for detecting a target object, including a transmitter for transmitting an electromagnetic wave, a receiver for receiving the electromagnetic wave reflected by the target object, a signal processor for measuring a distance between a vehicle of his/her own and the target object and a relative velocity on the basis of the transmitting electromagnetic wave and the receiving electromagnetic wave, and an interference detector for suspending a transmit operation of the transmitter under a control of the signal processor to detect an interference signal from another external device.
1. A radar system mounted on a vehicle for detecting a target object, comprising:
a transmitting means for transmitting an electromagnetic wave;
a receiving means for receiving the electromagnetic wave reflected by the target object;
a signal processing means for measuring a distance between a vehicle and the target object and a relative velocity on the basis of the transmitting electromagnetic wave and the receiving electromagnetic wave; and
an interference detecting means for suspending a transmit operation of the transmitting means under a control of the signal processing means, and detecting an interference signal from an external device.
2. A radar system mounted on a vehicle according to claim 1 , further comprising a beam scanning means that changes a transmit direction of the electromagnetic wave by the transmitting means and a receive direction of the electromagnetic wave by the receiving means,
wherein the interference detecting means suspends the transmit operation in a given scanning direction set by the beam scanning means.
3. A radar system mounted on a vehicle according to claim 2 , wherein the given scanning direction set by the beam scanning means is at an end of a predetermined scanning range.
4. A radar system mounted on a vehicle according to claim 2 , wherein the given scanning direction set by the beam scanning means is at both ends of a predetermined scanning range.
5. A radar system mounted on a vehicle according to claim 2 , wherein the given scanning direction set by the beam scanning means is at a center of a predetermined scanning range.
6. A radar system mounted on a vehicle according to claim 2 , wherein the given scanning direction set by the beam scanning means is a forward direction of the vehicle.
7. A radar system mounted on a vehicle according to claim 2 , wherein the given scanning direction set by the beam scanning means is sequentially changed within a predetermined scanning range.
8. A radar system mounted on a vehicle according to claim 1 , wherein the interference detecting means detects the interference signal by detecting a rise of noise floor.
9. A radar system mounted on a vehicle according to claim 8 , wherein the interference detecting means sets a given interference wave detection threshold value that is higher than a normal signal detection threshold value with respect to the rise of the noise floor.
10. A radar system mounted on a vehicle according to claim 1 , wherein the interference detecting means detects the interference signal by detecting a peak of a spectrum.
11. A radar system mounted on a vehicle according to claim 10 , wherein the interference detecting means sets a given interference wave detection threshold value that is higher than a normal signal detection threshold value with respect to the peak of the spectrum.
12. A radar system mounted on a vehicle according to claim 1 , wherein the interference detecting means detects the interference signal by detecting a rise of a noise floor and a peak of a spectrum.