The collision between satellites IRIDIUM 33 and COSMOS 2251 indicated that the clash of two on-orbit satellites was becoming an inevitable reality. Our calculation with the two-line orbit element by NORAD showed that some two geostationary satellites had approached very close in July 2009. Therefore, more attention should be given to avoid such collisions. This paper analyzes the orbital long-term variation of a dead satellite drifting in the geostationary orbit. Also, the negative effects posed by dead satellites upon the on-orbit operational geostationary satellites are studied. Then the paper proposes a novel idea to launch a satellite sweeper whose purpose is to collect the on-orbit dead satellites and help them de-orbit to a "graveyard". The satellite sweeper consists of a parent satellite and a child satellite. The child satellite collects a dead satellite and transfers it to a higher orbit. The parent satellite stationed in the geostationary orbit is in charge of refueling the child satellite. The strategy of maneuver and rendezvous is presented and a series of formulas are derived. The analysis results show that our method to clean the geostationary orbital zone is practical and fuel-saving. With the help of just a few satellite sweepers, we can gain a clean environment of geostationary orbit environment again. satellite sweeper, geostationary orbit, dead satellite, de-orbit, rendezvous Citation:Li Y H, Yang K Z, Shan C S, et al. A preliminary study on dead geostationary satellite removal.
Pico-satellite’s potential use is increasingly gaining nation’s recognition. Because of its small volume and light weight, it is necessary to develop the special deployer. The key technologies of Zhejiang University Pico-Satellite Deployer (ZDPSD) are, cutter unlocking the door, conical spring driving the pico-satellite, oriented rail restricting the direction and locking shaft fixing the door. In September 2010, the two pico-satellites were launched and deployed successfully at the predetermined orbit. The paper includes designing and analyzing of the moving system, mode analyzing of the deployer and the experiments on ground and in-orbit. The key process of the development is summarized, which can be regarded as reference for the further developing.
ABATRACTSpace mapping satellites play an increasingly important role in Space mapping satellites play an increasingly important role in mapping and mapping. The positioning accuracy of mapping satellites is the core and key index for evaluating the performance of Surveying and mapping. At present, it has developed to the precision of the meter level. Therefore, in the design process of Surveying and mapping camera, it is not only necessary to ensure that the image has good MTF, signal to noise ratio, dynamic range and other basic radiation characteristics, but also need to focus on the high precision calibration of the interior orientation elements of optical system distortion, optical axis, focal distance and other questions of orbit stability.In 2012 and 2016, China successfully launched ZY-3 (01/02) satellites, with a three-line-arrays camera and a multispectral camera. It is mainly used for the production of basic geographic information products of 1:50000 scale, and modification and updating of 1:25000 and larger scale topographic maps in China. The satellites have achieved good application results. Based on these experiences, driven by higher precision surveying and mapping requirements, as the main development and research organization of the Chinese space optical remote sensing camera, BISME has carried out a serial of research in the overall design of the space optical surveying camera. This paper gives some own views about the research for discussion and exchange.
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