直接受信衛星自動画像伝送データ(NOAA APT)の分標識符号の時刻精度

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The Automatic earth observation Picture Transmission data, NOAA-APT, which polar orbiting satellite directly transmits includes every minute time marker. Time accuracy of the marker is not investigated, moreover any efforts to utilize the marker are not tried before. In this paper time aecuracy of NOAA-APT minute time marker is investigated by comparing to the Japan Standard Time (JST). 1). The JST broadcasted by NTT and JJY is compared each other, and it is found that there exist several 10 milliseconds time delays in the JST broadcasted by NTT. This value restricts the accuracy of the time shown in this paper. 2). By using the maximum correlation method, which detects phasing point of time (starting point of time of scanning line) at the maximum correlation point of time between the pattern template that optionally extracted from NOAA-APT data, and NOAA-APT data, 99.7% of correct phasing points of time are detected. Detected phasing point of time contains the Doppler time delay, and the value of which is found to be several milliseconds, that gives a good approximation with the results obtained by satellite orbital calculations. It is found that the Doppler delay is ignorable in this research. 3). A time marker is constructed with 8 burst tone signals with 250 milliseconds period, the stating point of time of the fifth burst tone is chosen as a representative time. It is found that the representative time of the NOAA-APT minute time marker shows about +1.3140 seconds delay from the JST
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直接受信衛星自動画像伝送データ(NOAA APT)の分標識符号の時刻精度

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