衛星SEDSAT-1 サイクル時間


● (No.160) 衛星SEDSAT-1 サイクル時間 (Nov.25-Dec.7, 1998)
 ---------------------------------------------------------

 次のデータは、1998年11月25日(水)から 12月7日(月)に、衛星SEDSAT-1 から
 受信したテレメトリです。各々の 'Uptime'を解析すると、11月25日(水)には
 28時間37分だった1サイクル時間が、11月30日(月)には 40時間27分、そして
 12月3日(木)には 67時間24分、さらに12月7日(月)には87時間以上にまで増加
 していることが判明しました。(下図参照)

 また、12月1日(火) 03:51UTC までは、衛星からの信号の発信がなかったこと
 を考慮すると、このリセットの後から 次の送信開始までのパワーセーブ時間
 (沈黙時間)は 約12時間であったことも判明しました。つまり、この後に続く
 送信時間(実働時間)は、さらに日増しに増加することが予想できます。


----------------------------------------------------------------------------
Month, Day, Year, Hour, Minute, Second, Main Voltage, Main Current, Amps 
In Bat, +X, -X, +Y, -Y, +Z, Battery 1 Temp, Battery 2 Temp, CDC DC/DC Temp,
Mode-L DC/DC Temp, EMP Temp, MB DC/DC Temp, Deployer 1 Temp, Deployer 2 
Temp, Mode-L Power Amp Temp, CDS Boot, SEASIS Boot, Images, Reset Count, 
Mode-L State, Mode-A State, SEASIS State, Cameras State, Deployer State, 
Panel State, UpDays, UpHours, UpMinutes, UpSeconds, CallSign
11, 26, 1998, 4, 8, 34, 20344, 741, -1858413, 607, 205, 53, 41, 0, 8, 9,
20, 23, 10, 6, -6, 7, 9, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 001, 03, 46, JE9PEL
11, 27, 1998, 7, 14, 13, 20600, 728, -776032, 31, 473, 0, 87, 0, 9, 10,
22, 24, 11, 8, -6, 9, 11, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 001, 02, 15, JE9PEL
11, 28, 1998, 1, 27, 33, 21492, 687, 3489208, 678, 122, 58, 58, 0, 8, 9,
18, 21, 7, 5, -5, 4, 7, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 000, 12, 28, JE9PEL
11, 30, 1998, 7, 49, 17, 20568, 730, -1223557, 0, 603, 0, 0, 0, 12, 12, 25,
25, 15, 11, -5, 10, 14, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 001, 07, 27, JE9PEL
12, 1, 1998, 5, 25, 16, 21524, 702, 4066975, 385, 166, 0, 0, 124, 10, 10,
20, 22, 11, 7, -6, 6, 9, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 000, 12, 36, JE9PEL
12, 3, 1998, 8, 5, 13, 20281, 741, -6052095, 617, 266, 51, 0, 53, 14, 14, 
24, 25, 16, 12, -6, 10, 14, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 002, 15, 16, JE9PEL
12, 4, 1998, 7, 46, 0, 21492, 702, 4983266, 529, 97, 36, 0, 0, 14, 13, 25,
26, 16, 13, -6, 11, 15, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 000, 19, 32, JE9PEL
12, 4, 1998, 7, 46, 31, 21556, 696, 4984929, 336, 0, 588, 0, 166, 15, 15,
26, 28, 16, 14, -5, 12, 16, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 000, 19, 33, JE9PEL
12, 5, 1998, 5, 37, 42, 21556, 698, 3456407, 427, 0, 195, 0, 0, 15, 14,
25, 26, 16, 13, -6, 11, 15, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 001, 17, 24, JE9PEL
12, 7, 1998, 2, 59, 44, 21716, 693, 1769177, 395, 395, 0, 26, 34, 14, 14,
24, 26, 15, 12, -6, 9, 14, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 003, 14, 46, JE9PEL
----------------------------------------------------------------------------


        11/25   00:22UTC リセット --------------------------------
                    |                                           :
                    | (27時間46分)                              :
                    |                                           :
        11/26   04:08UTC 観測時刻 (Uptime 27時間46分)       28時間37分
                    |                                           :
                    | (0時間51分)                               :
                    |                                           :
                04:59UTC リセット --------------------------------
                    |                                           :
                    | (26時間15分)                              :
                    |                                           :
        11/27   07:14UTC 観測時刻 (Uptime 26時間15分)       32時間00分
                    |                                           :
                    | (5時間45分)                               :
                    |                                           :
                12:59UTC リセット --------------------------------
                    |                                           :
                    | (12時間28分)                              :
                    |                                           :
        11/28   01:27UTC 観測時刻 (Uptime 12時間28分)       35時間23分
                    |                                           :
                    | (22時間55分)                              :
                    |                                           :
        11/29   00:22UTC リセット --------------------------------
                    |                                           :
                    | (31時間27分)                              :
                    |                                           :
        11/30   07:49UTC 観測時刻 (Uptime 31時間27分)       40時間27分
                    |                                           :
                    | (9時間00分)                               :
                    |                                           :
                16:49UTC リセット --------------------------------
                    |                                           :
        12/01   00:00 - 00:17UTC ... Not hear                   :
                01:45 - 02:04UTC ... Not hear                   :
                03:32 - 03:51UTC ... Not hear                   :
                    |                                           :
                05:25UTC 観測時刻 (Uptime 12時間36分)           :
                    |                                       67時間24分
                    | (50時間40分)                              :
                    |                                           :
        12/03   08:05UTC 観測時刻 (Uptime 63時間16分)           :
                    |                                           :
                    | (4時間08分)                               :
                    |                                           :
                12:13UTC リセット --------------------------------
                    |                                           :
        12/04   07:46UTC 観測時刻 (Uptime 19時間33分)           :
                    |                                           :
        12/05   05:37UTC 観測時刻 (Uptime 41時間24分)           :
                                                                :
        12/07   02:59UTC 観測時刻 (Uptime 86時間46分)           :



 《参考1》(アリゾナ大学からのメール)

 To: telemetry@seds.lpl.arizona.edu,
  "Mineo Wakita" [JE9PEL@jamsat.or.jp]
 Date: Tue, 01 Dec 1998 18:24:13 -0700
 From: "Dennis Ray Wingo" [wingod@mailcity.com]
 Cc: amsat-bb@amsat.org
 Subject: SEDSAT in Nov.30-Dec.1 (Last Hopes)
 
 
 Mineo and Everyone
 
 Thanks again publicly for the great job you are doing getting data for us.
 
 It seems that we may be nearing the end of our efforts to recover the 
 bird. I have found out that one of the two mode L receivers on board the
 satellite was non functional when it was launched.  This was due to the
 removal of a part during final integration of the bird due to a fit 
 problem.
 
 There is a strong possibility that this was the main receiver.  The second
 receiver, even if it is working may be useless.  As you all know there are
 several receivers on most of the UoSats. SEDSAT is designed in the 
 communications section exactly the same.  It turns out that part of the
 initialization sequence was not implemented for the second receiver by the
 UAH team for unknown reasons.  
 
 There is a possibility, outlined by Harold whereby we may be able to get
 around this problem but it will require some very close coordiation with
 the beginning of the operating period after the satellite comes out of its
 safe mode.  As Mineo has correctly pointed out, SEDSAT "live" time is 
 increasing.  It is my theory that this is due to the day/night cycle ratio
 increasing.  If the bird gets to 80/20 day/night the bird will go power
 positive until that ratio drops below about 78/22.  The 80/20 ratio is
 possible. I will drop the bird into STK and figure out when this will be.
 
 Oh well at least we are getting some very good engineerig telemetry from
 the bird that is giving the NASA guys some data in which to evaluate the
 Nickel Metal Hydride batteries. Not a total loss.
 
 Please, those who are copying data continue to do so. It is very important
 and we may be able to figure out a way to get around some of the known
 problems with the uplink receiver.  I want to also thank Harold for his
 diligent combing through the code that found the software problem.
 
 There are still a couple of other things that we will try but since we
 have the best teams in the world in satellite operations in Jim White,
 Tim Cunningham, Graham Radcliff and others trying the bird, the hope of
 recovering the bird is dimming. Crap.
 
 
 Dennis
 KD4ETA



 《参考2》

 衛星SEDSAT-1 の最近の1サイクルが、本日(12/15)の観測によって確定しま
 した 。12月3日(12:13UTC)にリセットして以来、12月14日(09:33UTC)までの
 再リセットまで、延べ約11日間(厳密には 261時間20分)も稼働していたこと
 になります。(次図参照) 今後のこの衛星の活動に期待したいと思います。


       12/03   12:13UTC リセット --------------------------------
                    |                                           :
       12/04   07:39UTC 観測時刻 (Uptime  19時間26分)           :
       12/05   05:37UTC   〃   (Uptime  41時間24分)           :
       12/07   02:59UTC   〃   (Uptime  86時間46分)           :
       12/08   06:03UTC   〃   (Uptime 113時間50分)      261時間20分
       12/09   03:39UTC   〃   (Uptime 125時間26分)           :
       12/10   03:17UTC   〃   (Uptime 159時間04分)           :
       12/11   02:56UTC   〃   (Uptime 182時間43分)           :
       12/14   03:21UTC   〃   (Uptime 255時間08分)           :
                    |                                           :
       12/14   09:33UTC リセット --------------------------------
                    |                                           :
       12/15   02:49UTC 観測時刻 (Uptime  17時間16分)           :



 《参考3》

The following data were two frames that I received from SEDSAT in Dec 18.
One cycle was decreasing recently day by day.


> 12, 18, 1998, -1, 51, 47, 20759, 722, 1236652, 53, 31, 0, 278, 26, 7, 8,
> 16, 21, 6, 3, -6, 4, 6, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 000, 18, 54, JE9PEL
> 
> 12, 18, 1998, 1, 34, 52, 20759, 728, 686855, 0, 36, 488, 114, 61, 7, 8,
> 17, 21, 6, 3, -6, 4, 6, 1, 3, 0, 0, 1, 0, 0, 0, 0, 0, 000, 20, 37, JE9PEL


       12/03   12:13UTC Reset --------------------------------
                    |                                       :
       12/14   03:21UTC Observation (Uptime 255h08m)     261h20m
                    |                                       :
       12/14   09:33UTC Reset --------------------------------
                    |                                       :
       12/15   02:49UTC Observation (Uptime  17h16m)      38h46m
                    |                                       :
       12/16   00:19UTC Reset --------------------------------
                    |                                       :
               00:29-00:47UTC Not heard                     :
               02:17-02:32UTC Not heard                     :
                    |                                     28h38m
       12/17   01:59UTC Observation (Uptime  25h40m)        :
                    |                                       :
               04:57UTC Reset --------------------------------
                    |                                       :
               23:51UTC Observation (Uptime  18h54m)        :
                    |                                       :
       12/18   01:34UTC Observation (Uptime  20h37m)        :


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