| 摘要 |
PURPOSE:To increase a difference between solar radio emission receiving level and receiver noise level in the course of processing and enable the position data of the solar radio emission to be extracted in stable condition by utilizing signals to which normal video is LOG-converted when the position data from a radar are calibrated by using the solar radio emission. CONSTITUTION:A LOG converter 6 logarithmically converts A/D-converted 5 normal video 103 and outputs a second logarithmic video. A selector 7 is inputted with the outputs of an A/D converter 3 and the converter 6 and outputs either of the two outputs thus inputted by a control signal 104. When a radar is normally operated, the output of the converter 3 calibrates position data from the radar by solar radio emission. At this time, the control signal 104 is given so that the output of the converter 6 is selected as the output of the selector 7. The selection of the converter 6 is equivalent to increase in the number of bits of the converter 6 and in the stages of quantization for the signals of receiver noise, solar radio emission and the like. Accordingly, the position data of the solar radio emission can be extracted.
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