Radio detection device and method

A radio detection method of a radio detection device including two or more reception antennas, for detecting a detecting object by a mono-pulse method;

• wherein when the radio detection device includes,
• a variable gain unit for discretely changing respective signal intensity of a difference signal and a sum signal of each reception signal received by the two or more reception antennas;
• an A/D conversion unit for performing A/D conversion process on the difference signal or the sum signal the difference signal or the sum signal having the signal intensity changed by the variable gain unit;
• and
• an angle calculating portion for calculating an angle by the mono-pulse method using the difference signal and the sum signal after the A/D conversion process by the A/D conversion unit;
• wherein the radio detection method comprises:
• performing a control of individually switching a conversion magnification of the signal intensity by the variable gain unit with respect to the difference signal and the sum signal.