{"id":8117,"date":"2015-02-11T03:05:17","date_gmt":"2015-02-10T18:05:17","guid":{"rendered":"http:\/\/www.kawauchi.homeip.mydns.jp\/jh0cjh\/blog\/?p=8117"},"modified":"2023-05-26T05:52:59","modified_gmt":"2023-05-25T20:52:59","slug":"%e3%82%aa%e3%83%aa%e3%82%aa%e3%83%b3%e5%ba%a7%e3%80%811600%e5%b9%b4%e5%89%8d%e3%81%ae%e4%ba%88%e8%a6%8b","status":"publish","type":"post","link":"https:\/\/www.kawauchi.homeip.mydns.jp\/jh0cjh\/blog\/2015\/02\/11\/%e3%82%aa%e3%83%aa%e3%82%aa%e3%83%b3%e5%ba%a7%e3%80%811600%e5%b9%b4%e5%89%8d%e3%81%ae%e4%ba%88%e8%a6%8b\/","title":{"rendered":"\u30aa\u30ea\u30aa\u30f3\u5ea7\u30011600\u5e74\u524d\u306e\u4e88\u898b"},"content":{"rendered":"

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\"Orion\"<\/a><\/p>\n

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\"am_ant\"<\/a><\/p>\n

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\u300c\u3053\u308c\u3057\u304b\u306a\u3044\uff01\u300d<\/p>\n

\u305d\u306e\u661f\u3053\u305d\u304c\u3001\u300cM42 \u30aa\u30ea\u30aa\u30f3A\u300d\u3068\u547c\u3070\u308c\u308b\u96fb\u6ce2\u661f\u3067\u3057\u305f\u3002<\/p>\n

\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u6210\u5426\u306e\u3059\u3079\u3066\u3092\u3001\u3053\u306e\u661f\u306b\u639b\u3051\u3066\u3001\u3053\u306e\u65e5\u3001\u3053\u306e\u591c\u3001\u3053\u306e\u6642\u9593\u306b\u305d\u306e\u5834\u6240\u306b\u6765\u308b\u3067\u3042\u308d\u3046\u3001\u305d\u306e\u661f\u306e\u96fb\u6ce2\u3092\u53d7\u4fe1\u3067\u304d\u308c\u3070\u3001\u305d\u306e\u661f\u306e\u4f4d\u7f6e\u306f\u3042\u3089\u304b\u3058\u3081\u8a08\u7b97\u3067\u6c42\u3081\u3089\u308c\u3066\u3044\u308b\u8a33\u3067\u3059\u304b\u3089\u3001\u305f\u308f\u3093\u3060\u30a2\u30f3\u30c6\u30ca\u306e\u4f4d\u7f6e\u3067\u6b63\u78ba\u306a\u89d2\u5ea6\u306e\u6821\u6b63\u304c\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n

\u5730\u7403\u306f\u516c\u8ee2\u3068\u81ea\u8ee2\u3092\u7e70\u308a\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002 \u661f\u306e\u4f4d\u7f6e\u306f\u6642\u3005\u523b\u3005\u3068\u5909\u308f\u308a\u307e\u3059\u3002 M42\u661f\u96f2\u304c\u4eba\u5de5\u885b\u661f\u306e\u4f4d\u7f6e\u3092\u901a\u308b\u306e\u306f1\u5e74\u306e\u4e2d\u3067\u3082\u6570\u65e5\u3001\u305d\u3057\u3066\u3001\u305d\u306e\u5f53\u65e5\u3067\u3042\u3063\u3066\u3082\u3001\u4e88\u5b9a\u6642\u523b\u306e\u30011\uff0c2\u5206\u4ee5\u5185\u306b\u6821\u6b63\u3092\u7d42\u308f\u3089\u305b\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n

\u8a66\u9a13\u521d\u65e5\u3001\u7d50\u8ad6\u304b\u3089\u8a00\u3046\u3068\u3001\u5931\u6557\u3057\u307e\u3057\u305f\u3002 M42 \u304b\u3089\u306e\u96fb\u6ce2\u3092\u53d7\u4fe1\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002 \u304a\u5ba2\u3055\u307e\u304b\u3089\u3082\u5931\u671b\u3068\u843d\u80c6\u3001\u305d\u3057\u3066\u3069\u3046\u3059\u308b\u3064\u3082\u308a\u304b\u3068\u3044\u3046\u30d7\u30ec\u30c3\u30b7\u30e3\u30fc\u304c\u639b\u308a\u307e\u3057\u305f\u3002 \u3068\u306b\u304b\u304f\u7fcc\u65e5\u3082\u3046\u4e00\u56de\u3084\u3089\u305b\u3066\u6b32\u3057\u3044\u3068\u3044\u3046\u3053\u3068\u3092\u304a\u9858\u3044\u3057\u3001\u7fcc\u65e5\u3082\u6311\u6226\u3002<\/p>\n

\u305d\u3057\u3066\u3001\u7fcc\u65e5\u306f\u795e\u306b\u7948\u308b\u601d\u3044\u3067\u3001\u96fb\u6ce2\u661f\u3092\u63a2\u3057\u307e\u3057\u305f\u3002 \u307e\u3055\u306b\u91dd\u306e\u7a74\u3067\u5929\u7a7a\u306e\u661f\u3092\u63a2\u3059\u307b\u3069\u306e\u30c1\u30e3\u30ec\u30f3\u30b8\u3067\u3059\u3002 \u305d\u3057\u3066\u3001\u3064\u3044\u306b\u898b\u3064\u3051\u307e\u3057\u305f\u3002 \u3053\u308c\u306f\u3044\u307e\u3060\u306b\u79c1\u304c\u5b9d\u7269\u3068\u3057\u3066\u4fdd\u7ba1\u3057\u3066\u3044\u308b\u30c1\u30e3\u30fc\u30c8\u30ec\u30b3\u30fc\u30c0\u30fc\u306e\u8a18\u9332\u3067\u3059\u3002<\/p>\n

\"orion_a_chart_record\"<\/a><\/p>\n

\u9065\u304b1,600\u5e74\u524d\u306b\u767a\u305b\u3089\u308c\u305f\u96fb\u6ce2\u3067\u3059\u3002<\/p>\n

\u7121\u4e8b\u3001\u30a2\u30f3\u30c6\u30ca\u306e\u89d2\u5ea6\u306e\u6821\u6b63\u306f\u3053\u308c\u3067\u5b8c\u4e86\u3057\u307e\u3057\u305f\u3002 \u6065\u305a\u304b\u3057\u3044\u8a71\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u3089\u3048\u5207\u308c\u306c\u601d\u3044\u304c\u3042\u3075\u308c\u3001\u5c40\u820e\u5916\u306b\u98db\u3073\u51fa\u3066\u30aa\u30ea\u30aa\u30f3\u5ea7\u3092\u898b\u3042\u3052\u3066\u3001\u81ea\u5206\u3092\u4fe1\u3058\u3066\u304f\u308c\u305f\u304a\u5ba2\u69d8\u3068\u300cGracias!\u300d\u3068\u53eb\u3093\u3060\u3053\u3068\u3092\u601d\u3044\u51fa\u3057\u307e\u3059\u3002<\/p>\n

\u307e\u3055\u306b\u3001\u3053\u306e\u300cM42 \u30aa\u30ea\u30aa\u30f3A\u300d\u306f\u3001\u9065\u304b1,600\u5e74\u524d\u304b\u3089\u30011991\u5e74\u306e12\u6708\u3001\u30b9\u30da\u30a4\u30f3\u306e\u7247\u7530\u820e\u3067\u60a9\u307f\u82e6\u3057\u3080\u65e5\u672c\u306e\u82e5\u9020\u304c\u3044\u308b\u3053\u3068\u3092\u77e5\u3063\u3066\u3044\u3066\u3001\u96fb\u6ce2\u3092\u51fa\u3057\u7d9a\u3051\u3066\u304f\u308c\u3066\u3044\u305f\u8a33\u3067\u3059\u3002<\/p>\n

\u300c\u30aa\u30ea\u30aa\u30f3\u5ea7\u3001\u305d\u3057\u3066M42 \u661f\u96f2\u300d \u51ac\u306e\u5b63\u7bc0\u306f\u3001\u95a2\u6771\u5730\u65b9\u3067\u306f\u8089\u773c\u3067\u3082\u3001\u30aa\u30ea\u30aa\u30f3\u5ea7\u306e\u4e09\u3064\u661f\u306e\u4e0b\u306b\u30dc\u30fc\u30c3\u3068\u3057\u305f\u7d30\u9577\u3044\u96f2\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u898b\u3048\u308b\u306f\u305a\u3067\u3059\u3002 1600\u5e74\u524d\u306e\u5149\u3067\u3059\u3002 \u3053\u306e\u5b63\u7bc0\u3001\u3044\u3064\u3082\u3001\u3053\u306e\u661f\u3092\u898b\u4e0a\u3052\u3066\u306f\u5f53\u6642\u306e\u611f\u52d5\u3092\u601d\u3044\u8d77\u3053\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u79c1\u306e\u5b88\u8b77\u795e\u3067\u3059\u3002<\/p>\n

 <\/p>\n

Have you ever heard about “Radio Star”?
\nIn astronomy, “Radio Star” is a star that emits radio waves.
\nI had a very profound experience with the “Radio Star” that has saved me from a difficult situation of a certain project. Yes, “Radio Star” is my guiding star.
\nMore than 25 years ago, when I was very much younger, I was working as the Satellite communications Systems Engineer. During that time, I was the project manager for Satellite angular measurement and distance measurement stations in the Spanish Domestic Satellite Project. The project is not just about satellite to earth station communications but also involves determining the location and measuring the distance of the satellite itself in relation to the position of the parabolic antenna in the satellite control center. During that time, I already had several experiences in designing satellite communications earth stations that was rather simple and not as complicated like this Telemetry\/Telecomand and Satellite Angular Measurement stations involved in this project I am going to tell you about.
\nIn this TTC and AM station project, everything was very new to me and everything in this project was a challenge for me. I made thorough studies about these TTC and AM stations by reading technical documents and listening from the experts including the ones in the University where I graduated from.
\nThese kinds of stations have a very important role that after satellite launch, it should be able to capture the satellite beacon signal and precisely measure the angular position and distance to track the satellite location in order to lock on the satellite position. An error in the measurement will cause the satellite to drift and in the worst case, may result in the loss of millions of dollars of satellite equipment. This is one of the main functions in these critical stations.
\nDistance measurement is really not that difficult. I could make calculations of time delay using RF loop back circuits.<\/p>\n

\"am_ant\"<\/a><\/p>\n

The headache comes when dealing with angular measurement stations, especially when calibrating the alignment of the antenna angle. This is because huge parabolic antennas having a diameter of about 13m, in the case of low elevation angle position, the beam direction is slightly shifted downwards and therefore misaligned because of the deformation of the parabolic antenna surface by its own weight. Then in order to get the precise angular calibration, the calibration work should start at the antenna elevation angle that is pointing at the planned or theoretical satellite position.
\nBut how? It’s a very difficult question because there is NO satellite up there in the first place and it is that vacant position where we want to put the satellite we are launching.
\n“We have to find out something at the planned satellite position, that is emitting some kind of radio wave and its precise location should already be determined beforehand or easily calculated.”
\nOur project team got stuck with such difficult predicaments.
\nAfter deep thoughts and brainstorming, we found one possible solution: on a certain date and time, an astronomic Radio Star is crossing a planned satellite position. The date and time that astronomic Radio Start is crossing the planned satellite orbit, is just 3 months before the satellite launching date.
\nThe name of this Radio Star is “ORION-A”, located in the great nebula in the Orion constellation M42. If we can find this radio star relative to the nearest location of the planned satellite, we can precisely align the antenna using this radio star because the location of the star can be calculated with respect to the time and the location as seen from the earth. We also found that the noise signal level of the radio wave which can be measured thru the 13 m diameter parabolic antenna.<\/p>\n

We were very much thrilled with the great discovery of this timely coincidence of orbit data and ORION, the symbol of power was really a big help to all of us.
\nWe then tried to find out the noise level emitted from ORION-A during the midnight of December of 1991 from the suburb of Madrid city, Spain. However, measuring the radio noise level emitted by ORION-A was very difficult. The calculated level is just 0.1 dB from the noise floor. Not only that, the alignment and calibration should be done in near planned satellite position otherwise the calibration will have no meaning. Besides that, the allowable time period to find ORION-A and perform the following alignment work with ORION-A need to be completed in a very short time.
\nOn the first day, we failed and could not find ORION-A in the limited time period because the movement of the constellation was so fast and noise level from ORION-A was very low. It was really a fast-moving target. Our customer who was witnessing what we were doing was apparently disappointed and started to doubt not only our antenna alignment process but my ability as well.
\nOn the second day, we wrote a program to automatically drive the antenna considering the spin of the earth as compensation of the movement of the star then give the fixed step angle bias on the antenna to locate ORION-A. Finally, we succeeded in finding the radio wave noise signal from ORION-A rising up from the noise floor. The antenna was properly aligned by using the ORION-A position. I still have the chart record of this ORION-A radio wave signal as shown below:<\/p>\n

\"orion_a_chart_record\"<\/a><\/p>\n

Just a 0.1 dB radio wave signal level that has been emitted from ORION-A, which was emitted 1,600 years ago really saved us and saved our project.
\nIt was so euphoric and even emotional for me as project manager. I ran outside of the satellite control center building and cried tears of joy while looking up the direction of ORION-A\u2026.I shouted “ARIGATO ORION-A, you really saved us”.
\nEven now, after many years, whenever I look up to the star ORION-A, I become very emotional. 1,600 years ago ORION-A knew that I would have a problem in that project in 1991, and so it emitted radio waves to save me. This is really the handiwork of God.<\/p>\n

This is a true story and one of the most memorable events in my life.\u00a0 By the way, you can easily find ORION-A without telescope on a clear night. It is located at the middle of the lower part of the constellation ORION.
\nORION-A, surely gives us the power of the radio wave emitted 1,600 years ago and I will go with lord ORION’s guidance and help.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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