Radar apparatus, on-board radar system, and program

An on-board radar system comprising a plurality of radar apparatuses mounted on the front side of a vehicle,

• wherein each of the plurality of radar apparatuses includes:
• a transmitting antenna;
• a triangular wave generating unit configured to generate a first modulated wave and a second modulated wave which are transmitted from the transmitting antenna at a predetermined interval;
• a receiving antenna that receives radio waves obtained by causing an object to reflect the transmitted first and second modulated waves;
• and
• a signal intensity calculating unit configured to make a determination, on peaks equal to or greater than a predetermined value appearing in received signals which are received by the receiving antenna and which correspond to the first and second modulated waves, as to whether the peaks are due to a signal obtained by causing the object to reflect the transmitted wave emitted from a host radar device or the peaks are due to a signal obtained by causing a reflecting object including the object to reflect the transmitted wave emitted from another radar device.