News Column

Space debris stare and chase

June 27, 2014

Tenders are invited for: Space debris stare and chase The established primary ways to obtain a better knowledge of the near-Earth environment are radar measurements for the lower orbital altitudes and optical (passive) measurements for the higher altitudes. Active laser tracking is well established technology for cooperative targets with an on-board laser reflector for uncooperative targets this is an emerging technology which is expected to become practically available in a few years. Objects with a-priori information on their trajectory e.g. from an existing catalogue can be tracked repeatedly over significant fractions of the orbital period therefore allowing to maintain good knowledge of the orbitparameters and of the catalogue as a whole. However for a more complete statistical characterisation of the near-Earth debris environment also non-catalogued debris is observed. For such observation scenarios the direction of the sensor s field of view (FOV) is fixed or following a pre-defined law ( stare mode ) which doesn t coincide with the objects motion therefore these scenarios typically lead to short observation arcs and resulting poor orbital information e.g. Beam-park experiments Fence-type surveillance radarsand Optical telescopes for which the FOV is small compared the speed of the object s motion In particular for the identification of the sources of debris e.g identifying past fragmentations events and relating detected objects to such events a better characterisation of the orbit information is desired which requires tracking of the object over longer observation arcs. This follow-up tracking has to be performed before the low quality of the trajectory information that can be derived from such stare-mode measurements becomes useless. Depending on the details of the stare-mode this follow-up may be needed within a (few) minute(s) i.e. if the same sensor as for the stare-mode observation is used this sensor has to  chase and track the object during the same pass over that sensor s site. Similar stare and chase scenarios may arise if two different sensors are involved e.g. a combination of a radar fence forstare-mode detection and a chasing tracking radar or a telescope detecting fast-moving LEO objects in stare-mode which are to be followed up by a tracking telescope or an active laser ranging system. This study will cover: Task 1: Review and collection of typicalmeasurement accuracies for the stare mode observations and of the required accuracy of a-priori pointing information of the tracking sensors used for chasing in tracking mode Task 2: Algorithms for the trajectory determination and prediction shall be reviewed andfurther developed. Performance parameters shall be derived and the algorithms suitability for the various stare and chase scenarios shall be evaluated. Task 3: Promising approa

Major organization : EUROPEAN SPACE AGENCY (ESA)

Address : ESA Head Office 8-10 Rue Mario Nikis 75738 Paris Cedex 15

Country :France

Email :

Tender notice number : AO7889

Notice type : Tender Notice

Open date : 2014-08-08

Tender documents : T22782503.html

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Source: TendersInfo (India)

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