PURPOSE:To improve the temperature resolution by using a multi-beam array antenna which has a multi-beam and connecting independent receivers to respective feed points of the antenna. CONSTITUTION:The array antenna 1 is connected to an array antenna feeding circuit 2 one to one and the multi-beam is formed of the feeding circuit 2, and received microwave noise outputs of plural systems among its outputs are sent out. Those noise outputs are supplied to the receivers composed of RF/frequency conversion parts 13-16 and IF/detection parts 17-20 through switches 3-6. The detection output of the receiver is outputted to a data processing system 21. The switches 3-6 switch the noise outputs of the feeding circuit 2 and a noise system for calibration. A sky horn 10, a comparison noise sound source 11, and a standard noise source 12 are provided as a noise sound source for calibration and those are distributed and switched by a hybrid element 9 and switches 7 and 8.
展开▼
