● (No.203) 衛星SO-33(SEDSAT-1) リセットデータ (2000年4月19日) ------------------------------------------------------------- 今から1年半前の 1998年10月24日に打ち上げられた衛星SO-33(SEDSAT-1)が、 弱ってきているようです。この衛星は、アマチュア無線と宇宙工学の教育目的 にアメリカのアラバマ大学の学生と指導者を中心に製作されたもので、初期の 頃よりデジタル送信機が不調で、数十時間ごとにハードリセットを繰り返して いました。 (このホームページの過去の記事を参照) http://www.asahi-net.or.jp/~EI7M-WKT/ 先日(4月13日)、そのデジタル送信機が リセットする瞬間のデータを、偶然に 受信することができました。(下記データ UpDays,UpHours,UpMinutes に注目) アリゾナ大学の衛星プロジェクトマネージャの Lewicki氏らの指摘によると、 このデータの中の CDS_Boot と、SEASIS_State の数値変化が 注目すべき箇所 のようです。 (全データは次に登録済み) http://www.ne.jp/asahi/hamradio/je9pel/ ----- Date: Sat, 15 Apr 2000 19:41:45 +0900 From: "M. Wakita" [je9pel@jamsat.or.jp] To: telemetry@seds.org Subject: SEDSAT telemetry Apr 13,15 000413-JE9PEL.tlm with SGS20.EXE http://uah.seds.org/projects/sedsat/ Month, Day, Year, Hour, Minute, Second, CDS Boot, SEASIS State, 4, 13, 2000, 1, 43, 2, 1, 0, 4, 13, 2000, 1, 46, 1, 1, 0, 4, 13, 2000, 3, 30, 1, 0, 1, 4, 13, 2000, 3, 31, 1, 0, 1, ....., UpDays, UpHours, UpMinutes, UpSeconds ....., 001, 01, 46, 00 ....., 001, 01, 49, 00 ....., 000, 00, 19, 00 ....., 000, 00, 20, 00 ----- Date: Sat, 15 Apr 2000 07:20:30 PDT From: "Jason Rupert" [jkrupert@hotmail.com] To: je9pel@jamsat.or.jp Subject: Re: SEDSAT telemetry Apr 13,15 Mineo, Many thanks for the SEDSAT telemetry. We greatly appreciate your continuing efforts. Was the signal strong or weak? Our station is still minus one TNC so we are dependent upon the kindness of other amateur radio operators for telemetry. Again thank you for your support. Sincerely, Jason Rupert ----- Date: Sat, 15 Apr 2000 23:13:33 -0700 From: Chris Lewicki [chrisl@seds.org] To: "M. Wakita" [je9pel@jamsat.or.jp] CC: telemetry@seds.org, UA-SEDSAT [uasedsat@seds.org], SEDSAT [sedsat@seds.org] Subject: Re: SEDSAT telemetry Apr 13,15 Hi Mineo, Thanks for the data! I hadn't seen SEDSAT data and was starting to wonder if it had finally gave in, but your data shows otherwise! 539 days (and maybe as many resets) and still going! There are some interesting items in the April 13 data. I'm not the best to interpret them, but "CDS Boot" switches between 0 and 1 (I think its usually 0). The "SEASIS State" does the same. From what I could quickly gather from a look at data from the beginning of the mission it looks like most of the temperatures, voltages and currents are all mostly the same. Anyway, thanks for the data and keep sending it when you get it. I'd appreciate taking a look at a period of time since we haven't done that in a while. It'd be nice to get an idea of how often its rebooting, etc... For those of you still interested in SEDSAT, the SEDSAT homepage has moved to http://uah.seds.org/ -- However, the UAH folks are having network problems, so its not always accessible. Christopher A. Lewicki KC7NYV 626.230.6662 A Maintainer of SEDS.ORG No project, no plan, just a graduate student and his thesis... ----- Date: Tue, 18 Apr 2000 09:14:32 -0500 From: "Chris Bond" [Chris.Bond@oarcorp.com] To: "'Chris Lewicki'" [chrisl@seds.org], "'M. Wakita'" [je9pel@jamsat.or.jp] Cc: telemetry@seds.org, "'UA-SEDSAT'" [uasedsat@seds.org], "'SEDSAT'" [sedsat@seds.org] Subject: RE: SEDSAT telemetry Apr 13,15 Chris, Mineo, et. al., Sorry if anyone gets multiple copies of this... not sure who's on which list anymore... Just thought I'd toss my 2 cents in on interpreting the SEDSAT data. First of all, I continue to be amazed that she's made it this long, considering she was only built for a 1 year mission, and even that assumed some power management by the ground team. Now, about the SEASIS and CDS Boot flags... here's the interpretation (This is represented in SGS20, also): CDS Boot 0 - The last boot was a reset 1 - The last boot was due to a power cycle 2 - The last boot was the start of the mission SEASIS Boot 0 - The SEASIS boot codes (From CDS) did not transfer properly 1 - The SEASIS boot codes were transfered by CDS, but CDS has not yet heard a response from SEASIS 2 - SEASIS booted normally 3 - SEASIS was not booted because CDS detected a reset or power cycle on last boot So, we can expect CDS Boot to waffle between 0 and 1, depending on the orbit conditions. We'll never see a 2, because I doubt the voltage will ever be high enough on a power cycle for CDS to think it's the start of a mission. For what it's worth to other satellite programs, this system seems to work. SEASIS boot should probably always be 3, because SEASIS is not booted on power cycles or resets. SEASIS controls the cameras and filter wheels, and without an uplink is fairly useless. I probably should have anticipated the scenario of no uplink at all and thought of a way to get at least a single picture down, but hindsight is 20/20, after all. Finally, let me say congratulations and thank you to Mineo, for continuing to send us data. -Chris Bond ----- Date: Tue, 18 Apr 2000 07:57:32 -0700 From: "Dennis Ray Wingo" [wingod@mailcity.com] To: "'Chris Lewicki'" [chrisl@seds.org], "'M. Wakita'" [je9pel@jamsat.or.jp], Chris.Bond@oarcorp.com Cc: telemetry@seds.org, "'UA-SEDSAT'" [uasedsat@seds.org], "'SEDSAT'" [sedsat@seds.org] Subject: RE: SEDSAT telemetry Apr 13,15 Folks and Especially Mineo Thanks again for sending in this data. The core mission of SEDSAT was to build the bird and get the engineering data that you folks are so kindly supplying. I spoke with Dr. Charles Lundquist yesterday and there are some students who are trying to take this data, interpret it, and present it at the Small Satellite conference in Logan Utah in the late summer/fall. SEDSAT 1 is a success, in spite of the receiver problems. The fact that the bird is still working at all is amazing with all of the 100% battery discharges. Also, the bird is going through 1180 km several times a day which is the bottom of the radiation belts and is still working. This is far in excess what the statistical predictions were for the radiation tolerance of the bird's integrated circuits, especially the analog chips. Again, Mineo thank you for your valuable data that you are sending to us. Chris Bond/Lewicki a question. Is this data being archived? If not can I get access to the entire suite of data files so that I can archive them on CD ROM. Thanks! Dennis Wingo KD4ETA ----- Date: Tue, 18 Apr 2000 12:42:41 -0700 From: "Chris Lewicki" [chrisl@seds.org] To: wingod@mailcity.com, "'M. Wakita'" [je9pel@jamsat.or.jp], Chris.Bond@oarcorp.com Cc: telemetry@seds.org, "'UA-SEDSAT'" [uasedsat@seds.org], "'SEDSAT'" [sedsat@seds.org] Subject: Re: SEDSAT telemetry Apr 13,15 > Thanks again for sending in this data. The core mission of SEDSAT > was to build the bird and get the engineering data that you folks > are so kindly supplying. I spoke with Dr. Charles Lundquist > yesterday and there are some students who are trying to take this > data, interpret it, and present it at the Small Satellite conference > in Logan Utah in the late summer/fall. I would be happy to provide my SQL expertise in helping them get at the information they're looking for (maybe I'd be interested in being a co-author!). There's almost 20,000 lines of telemetry in the database, spannign 18 months, and the globe, so there's a pretty good data set there. > Again, Mineo thank you for your valuable data that you are sending > to us. Chris Bond/Lewicki a question. Is this data being archived? > If not can I get access to the entire suite of data files so that I > can archive them on CD ROM. Yes -- I had been mainting the archive on SEDS.org until I handed it back over to UAH for care and feeding, however, we haven't gotten much data since then, so the UA Database is for the most part current. Probably would just take me a few minutes to get it back into check, the UAH server continues to be inaccessible. All the data (including many screen captures) is only 10MB, so its not that large of a data volume. -- Christopher A. Lewicki KC7NYV 626.230.6662 A Maintainer of SEDS.ORG No project, no plan, just a graduate student and his thesis... ----- Date: Wed, 19 Apr 2000 06:55:15 -0700 To: telemetry@seds.org, "M. Wakita" [je9pel@jamsat.or.jp] From: "Dennis Ray Wingo" [wingod@mailcity.com] Cc: Chris.Bond@oarcorp.com, chrisl@seds.org, wingod@mailcity.com, jkrupert@hotmail.com Subject: Re: SEDSAT telemetry 13,15 >Thank you to many informations on CDS and SEASIS Boot. >What are the initials of these words 'CDS and SEASIS' ? >And what is the work of CDS ? Mineo The Acronym CDS stands for the Command Data System. This is the system controller board and consists of an Intel 80C186 embedded microprocessor running UAH developed tasks under Harold Price's SCOS (Spacecraft Operating System). The Acronym SEASIS (Pronounced SEA-SIS) stands for the SEDS Earth Atmosphere and Space Imaging System. The Term SEDS stands for the Students for the Exploration and Development of Space. The CDS controls the power system and interfaces to the SEASIS Image processor and the transponders. Thanks again for your kind assistance. Dennis ----- Date: Wed, 19 Apr 2000 08:56:44 -0500 From: "Chris Bond" [Chris.Bond@oarcorp.com] To: je9pel@jamsat.or.jp Subject: RE: SEDSAT telemetry Apr 19 Mineo, CDS = Command Data System, is a 16mhz, 80186c processor board with 32 megabytes RAM. It's primary responsibility is housekeeping (keeping the batteries charged, reading temperatures, etc), and communications. It's the system which sends the telemetry you've been receieving. SEASIS = SEDSAT Earth And Space Imaging System, is a SCC-100 transputer based board, also with 32 megabytes RAM. It's responsible for running the cameras, filter wheels (for the cameras), and the magnetorquers (for stabilization and orientation control). Unfortunately, the only code we had time to develop for it prior to launch was to snap 80 images on start of mission... which have since been lost due to power cycles. It was intended to upload programs to it post-launch, but without an uplink this is impossible... I'm always glad to answer questions.... -Chris Bond
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