document title / titre du document TRP W ORK PLAN ... - emits - ESA

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TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 TRP Reference: Title: T603-36EC Future technology studies for APS Star Trackers The contractor shall investigate potential new star trackers technologies that may be of use in the future to further reduce the cost while improving the robustness (dynamic conditions, straylight/blinding, false stars and radiation) and functionalities (sensing of moon or earth/asteroid/planet position for example, direct entry to tracking). These shall include the mandatory consideration of LCMS APS detector by Cypress (Fillfactory) -designed specifically for this purpose-, baffle construction materials, plastic lenses, black coatings, alternative construction techniques, single chip electronics (all processing in the same ASIC/FPGA), and wireless communication. In addition, the contractor shall be expected to propose further new technologies themselves. Technical evaluations shall be performed on each technology considered and all promising technologies breadboarded for further, more detailed, evaluation and, where appropriate, development plans to bring the technology to the correct maturity level shall be drawn up. The emphasis shall be on production cost lowering from a continued reduction of the number of components, an easing of assembly, automated testing and cheaper construction techniques. Deliverables: Breadboards. Current TRL: TRL2 Target TRL: TRL4 Application Need/Date: TRL5 by 2010 Application/Mission: All missions Contract Duration: 24 months SW Clause : - Dossier0 Ref.: T-7815 Consistency with Harmonisation Roadmap and Conclusions: Page 155 of 227
TRP Work Plan 2005-2007 Description of Activities TEC-SB/7935/dc 12/Feb/09 TRP Reference: Title: T603-38EC Enhanced CCD Star Tracker Since the introduction of the Autonomous Star Trackers in the 1990s, their popularity and use on space missions has steadily increased until today were these units are used on all classes of mission and are becoming the sensor of choice for almost all missions. The European space industry has been at the forefront of this technology development, indeed in 2000/2001 there were nearly 15 European companies developing or selling star trackers. This amount of competition was unsustainable and so, at a harmonisation meeting in 2001, it was decided to no longer support the development of CCD based star trackers and concentrate instead on targeted developments to produce the next generation of star trackers based on APS detectors, these having the potential to allow lighter, more compact and cheaper Star Trackers that simultaneously offered higher robustness. Industry was left to support itself for the CCD star trackers. This policy had the desired effect of reducing the number of European Star Tracker manufacturers dramatically while simultaneously forcing manufacturers to improve their units and reduce prices. Today there are 5 star tracker suppliers in Europe, each of whom have survived by being highly competitive on the world stage. With a manageable number of suppliers, a large proportion of each of these companies business now coming from outside Europe and there still being an expected overlap of 2 to 4 years between CCD based and APS based star tracker supply it is now time to resume providing support to maintain and improve the existing CCD based product lines. The Terma HE-5AS STR has been selected for Cryosat, Aeolus and the LPF missions. Following the loss of Cryosat at launch it is also expected to fly on Cryosat 2. Work performed now to secure the STR and improve its robustness, reliability and qualification status will therefore have a near term beneficial effect on several ESA missions. This policy was clearly expressed in ESA/IPC(2005)70 rev.1, calling for product improvements of CCD Star Tracker , mainly for recurring platforms. According to the outcomes of the 2005 Harmonisation Roadmap on AOCS Sensors and Actuators, the present activity aims at: ensuring the availability of the HE-5AS to ESA projects for at least the next 3 years; improving the robustness and ease of use of the HE-5AS within the scope of the existing electrical design limitations; improving the straylight and thermal design and the understanding of their interactions and dependencies on the s/c system and orbital environment. This will result in the following main three tasks: 1. Software improvements for Robustness and Reliability; 2. Component obsolescence and Europeanisation; 3. System level analysis and improvements. This measure is implemented in line with IPC(2005)30, rev. 1 (Formal review of the geographical distribution of contracts), calling for a DG's additional effort to improve the geographical return of certain countries, including Denmark. Deliverables: In-flight data analysis report; design improvements and trade off report; improved SW design report; SW Test plan/procedures/report Current TRL: TRL3-4 Target TRL: Application Need/Date: TRL8 (in-flight demo on TRL5-6 Cryosat-2) by 2009 Application/Mission: All missions Contract Duration: 18 months T-25, T26, T-27, T-29, T-30, SW Clause : - Dossier0 Ref.: T-33, T-34, T-965 Consistency with Harmonisation Conclusions: ESA/IPC(2005)70 rev.1 Roadmap and Conclusions: Page 156 of 227
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