アマチュア衛星 UoSAT-3 UO-14

UoSAT-3 UO-14

JAMSAT 日本アマチュア衛星通信協会

AO-27 UO-14 FAQ by W2RS(日本語)
UoSAT Amateur Satellite home page by Chris Jackson G7UPN/ZL2TPO
UoSAT-3 Microsatellite Mission
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UoSAT-3 UO-14

打ち上げ後 UO-14 のOSCAR番号を与えたれた、UoSAT-3(D) は英国 Surrey 大学の製作したマイクロ衛星です。1990年1月21日にUoSAT-4(E) やAO-16, DO-17, WO-18, LO-19 とともにAriane4/ASAPにて打ち上げられました。初めて9600bpsの転送速度を使ったデジタルストアードアンドフォワード通信衛星です。

この衛星は始めの18ヶ月間はアマチュア衛星として運用され、その後は非アマチュア業務に切り替えられてアフリカで働くボランティア医師や技術者へのメッセージ転送に使われましたが、搭載コンピュータの故障により、ストアードアンドフォワード方式の運用はできなくなりました。

サリー大学のコマンド局は、打ち上げ10周年になった2000年に、この衛星に残された機能を使いFMリピータ衛星としてアマチュア無線業務に復活させました。利用者に好評であればこのモードの運用が続けられます。

アップリンク 145.975 MHz
ダウンリンク 435.070 MHz

この衛星は、軌道上で先に錘をつけた重力傾斜ブームを展開し、衛星の底面が常に地球の中心を向くようにされています。

こちらが常に地球を向く

From: Chris Jackson <c.jackson@eim.surrey.ac.uk>
To: "'amsat-bb@amsat.org'" <amsat-bb@AMSAT.Org>
Subject: [jamsat-amsat-bb:30190] UO-14 10th birthday present
Date: Wed, 23 Feb 2000 13:06:24 -0000

UO-14 was launched in January 1990 and spent its first 18 months in orbit
operating as an amateur store and forward satellite prior to the launch of
UO-22.  It was then switched for use by VITA (Volunteers In Technical 
Assistance) who used it for messaging into Africa.  

Since the computer which is used for store and forward communications is no
longer able to perform that task, UO-14 is no longer usable in this mode.
It is however possible to use the satellite as a single channel FM voice
repeater, and I have just configured the satellite to do this.

The uplink is 145.975, and the downlink is 435.070.

I will leave the satellite running in this mode for the next few weeks.  If
it is useful, then I will probably leave it running - if it isn't used, it
will be switched to transmitting telemetry.

Happy 10th birthday UO-14!

73,
Chris G7UPN / ZL2TPO
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打ち上げ後の主な出来事

UoSAT OPERATIONS REPORT - August 1996

UoSAT-3 Object Number 20437

Orbit: 784.4 x 800.0 km @ 98.58 degrees inclination

UoSAT-3 supports both a store-and-forward communications system for use by various humanitarian and medical groups around the world and a number of onboard experiments including: the Total Dose Experiment (TDE) & the Cosmic Particle Experiment (CPE).

On the 21st August it was observed that UoSAT-3 OBC was not operating after over 4 years of uninterrupted service. Telemetry confirmed that the OBC-186 power switch had tripped, turning the OBC off. It is suspected that this was caused by a radiation induced latchup that caused the OBC current to momentarily exceed the maximum value. The OBC was reloaded with updated flight software that provides additional housekeeping functions that had not previously been available on UoSAT-3 due to the long time since its previous reload.

UoSAT-3 was launched in January of 1990 and has completed in excess of 34,700 orbits of the Earth to date.

UoSAT OPERATIONS REPORT - February 1996

UoSAT-3 Object Number 20437

Orbit: 784.4 x 800.0 km @ 98.58 degrees inclination

UoSAT-3 supports both a store-and-forward communications system for use by various humanitarian and medical groups around the world and a number of onboard experiments including: the Total Dose Experiment (TDE) & the Cosmic Particle Experiment (CPE).

On 22nd February the Integrated Housekeeping Task (HIT) running on UoSAT-3 suffered a software problem that has inhibited ground controllers from scheduling Whole Orbit Data (WOD) telemetry surveys. This was caused by a known software bug that was fixed a number of years ago, however the current UoSAT-3 flight code has now been operating for over 3ｽ years and was loaded before the problem was solved. While the inability to schedule WOD surveys is an annoyance, it does not affect the safety of the spacecraft and standard telemetry is still available. If the situation requires, updated flight code can be loaded to the spacecraft to overcome the problem, however for the moment this is not deemed necessary.

The spacecraft has operated nominally throughout the reporting period and has completed over 1310 days of successful operation since the last software reload of the onboard computer's multitasking system. All mission objectives for this spacecraft were met during January.

UoSAT-3 was launched in January of 1990 and has completed in excess of 31,900 orbits of the Earth to date.

UoSAT/SSTL missions as of 13:00 UTC 1/3/94:

UoSAT-3 Object Number 20437

Orbit: 784.4 x 800.0 km @ 98.58 degrees inclination

UoSAT-3 supports both a store-and-forward communications system and a number of onboard experiments including: the Total Dose Experiment (TDE) & the Cosmic Particle Experiment (CPE). The spacecraft has operated nominally throughout the reporting period and has completed over 940 days of successful operation since the last software reload of the onboard computer's multitasking system. All mission objectives for this spacecraft were met during February. UoSAT-3 was launched in January of 1990 and has completed in excess of 26,700 orbits of the Earth to date.