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1. A radar device, comprising: transmitting-receiving circuitry to transmit a plurality of transmission signals each of which is a pulse wave having different frequency band to a target at respective different timings and acquire a reception signal by receiving a reflection signal reflected from the target; and target detecting circuitry to detect the target on a basis of the reception signal acquired by the transmitting-receiving circuitry, wherein while transmitting any one transmission signal out of the plurality of transmission signals, the transmitting-receiving circuitry acquires, as a reception signal for target detection, a reception signal of a frequency band different from a frequency band of the transmission signal, and blocks a reception signal of a same frequency band as the frequency band of the transmission signal, and the target detecting circuitry includes: a mixer to down-convert the reception signal for target detection acquired by the transmitting-receiving circuitry; an analog-to-digital converter to convert the reception signal for target detection down-converted by the mixer from an analog signal into a digital signal; range Doppler processing circuitry to calculate a range Doppler signal indicating a speed of the target and a distance to the target on a basis of the reception signal for target detection converted into the digital signal by the analog-to-digital converter; and target determination processing circuitry to determine presence or absence of the target on a basis of the range Doppler signal calculated by the range Doppler processing circuitry, and the target detecting circuitry detects the target on a basis of the reception signal for target detection acquired by the transmitting-receiving circuitry, and the range Doppler processing circuitry corrects a phase rotation within a pulse caused by movement of the target and a phase rotation determined by the distance to the target and a difference between transmission frequencies in the reception signal for target detection converted into the digital signal by the analog-to-digital converter, and calculates the range Doppler signal by performing coherent integration on a corrected reception signal for target detection.
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