| 摘要 |
<p>PURPOSE:To obtain a high-performance radar with less temperature resolutions while lowering the cost with reduction in weight and size of the apparatus, by arranging an antenna for receiving noise power of millimeter wave band, a local oscillator, a mixer, a single-throw unipole switch, an amplifier, a signal processing section and the like. CONSTITUTION:When a single-throw unipole switch 11 is turned ON, an antenna 1 is connected to a mixer 4 and receives a noise power of millimeter wave or the like radiated from an object. The noise power is mixed with a signal from a local oscillator 5 by the mixer 4 and the frequency of the signal is converted into an intermediate frequency from the millimeter wave by frequency conversion. After amplified with an amplifier 6, the noise power thus converted to the intermediate frequency is detected with a power meter 7 to be converted into a voltage value and sent to a signal processing section 8. When the single- throw unipole switch 11 is turned OFF, internal noise power generated within the switch 11, the mixer 4 and the amplifier 6 is measured and the noise power from the object is compared with the results as reference to calculate an equivalent noise temperature of the object.</p> |
