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A radar apparatus includes a retrieval unit, an estimation unit, a calculation unit, and a determination unit. The retrieval unit retrieves a strong reflection object based on a signal strength which a frequency spectrum of a beat signal generated by mixing a transmission signal which is frequency-m

A radar apparatus includes a retrieval unit, an estimation unit, a calculation unit, and a determination unit. The retrieval unit retrieves a strong reflection object based on a signal strength which a frequency spectrum of a beat signal generated by mixing a transmission signal which is frequency-modulated and emitted and a reception signal which is formed in the transmission signal is reflected on a target indicates. The estimation unit estimates an estimation orientation which is an orientation of a target assumed to be present around the strong reflection object, based on a relative distance to the strong reflection object. The calculation unit calculates power which is the signal strength for the estimation orientation by generating an orientation spectrum in the estimation orientation based on a frequency component corresponding to the relative distance. The determination unit determines whether there is the target in the estimation orientation based on the power.

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1. A radar apparatus, comprising: a retrieval unit that retrieves a strong reflection object based on a signal strength which a frequency spectrum of a beat signal generated by mixing a transmission signal which is frequency-modulated and emitted and a reception signal which is a reflection wave for

1. A radar apparatus, comprising: a retrieval unit that retrieves a strong reflection object based on a signal strength which a frequency spectrum of a beat signal generated by mixing a transmission signal which is frequency-modulated and emitted and a reception signal which is a reflection wave formed in the transmission signal is reflected on a target indicates;an estimation unit that estimates an estimation orientation which is an orientation of a target assumed to be present around the strong reflection object, based on a relative distance to the strong reflection object;a calculation unit that calculates power which is the signal strength for the estimation orientation by generating an orientation spectrum in the estimation orientation based on a frequency component corresponding to the relative distance; anda determination unit that determines whether there is the target in the estimation orientation based on the power. 2. The radar apparatus according to claim 1, wherein the calculation unit generates the orientation spectrum by using an arrival direction estimating method of a beam scanning type. 3. The radar apparatus according to claim 2, wherein the determination unit determines that there is the target in the estimation orientation when the power is equal to or more than a predetermined threshold value and determines that there is no target in the estimation orientation when the power is less than the threshold value. 4. The radar apparatus according to claim 3, wherein the determination unit uses the threshold value, which is set in advance, so as to vary according to the relative distance to the target. 5. The radar apparatus according to claims 4, wherein: the radar apparatus is mounted on a vehicle, andthe estimation unit estimates an orientation corresponding to a width of a lane on which the vehicle travels as the estimation orientation. 6. The radar apparatus according to claim 5, wherein the estimation unit adjusts the estimation orientation according to a rudder angle and a yaw rate of the vehicle. 7. The radar apparatus according to claims 3, wherein: the radar apparatus is mounted on a vehicle, andthe estimation unit estimates an orientation corresponding to a width of a lane on which the vehicle travels as the estimation orientation. 8. The radar apparatus according to claim 7, wherein the estimation unit adjusts the estimation orientation according to a rudder angle and a yaw rate of the vehicle. 9. The radar apparatus according to claims 2, wherein: the radar apparatus is mounted on a vehicle, andthe estimation unit estimates an orientation corresponding to a width of a lane on which the vehicle travels as the estimation orientation. 10. The radar apparatus according to claim 9, wherein the estimation unit adjusts the estimation orientation according to a rudder angle and a yaw rate of the vehicle. 11. The radar apparatus according to claims 1, wherein: the radar apparatus is mounted on a vehicle, andthe estimation unit estimates an orientation corresponding to a width of a lane on which the vehicle travels as the estimation orientation. 12. The radar apparatus according to claim 11, wherein the estimation unit adjusts the estimation orientation according to a rudder angle and a yaw rate of the vehicle. 13. A target detecting method, comprising: receiving a reflection wave which arrives as a transmission signal which is frequency-modulated and emitted as a reception signal;retrieving a strong reflection object based on a signal strength indicated by a frequency spectrum of a beat signal generated by mixing the reception signal and the transmission signal;estimating an estimation orientation which is an orientation of a target assumed to be present around the strong reflection object, based on a relative distance to the strong reflection object;calculating power which is the signal strength for the estimation orientation by generating an orientation spectrum in the estimation orientation based on a frequency component corresponding to the relative distance; anddetermining whether there is the target which becomes a target in the estimation orientation based on the power. 14. A radar apparatus, comprising: a retrieval means that retrieves a strong reflection object based on a signal strength which a frequency spectrum of a beat signal generated by mixing a transmission signal which is frequency-modulated and emitted and a reception signal which is a reflection wave formed in the transmission signal is reflected on a target indicates;an estimation means that estimates an estimation orientation which is an orientation of a target assumed to be present around the strong reflection object, based on a relative distance to the strong reflection object;a calculation means that calculates power which is the signal strength for the estimation orientation by generating an orientation spectrum in the estimation orientation based on a frequency component corresponding to the relative distance; anda determination means that determines whether there is the target in the estimation orientation based on the power.