In a radar system installed in a vehicle, a first measuring unit measures a first physical relationship between the vehicle and a first object based on a received first echo signal A second measuring unit measures a second physical relationship between the vehicle and a second object based on a received second echo signal. A failure detector detects whether a failure occurs in each of the first and second measuring units. When it is detected that a failure occurs in one of the first and second measuring units, an alternative control unit causes the other of the first and second measuring units to serve as an alternative to the one of the first and second measuring units to thereby measure a corresponding one of the first and second physical relationships.
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