Local orbital debris flux study in the geostationary ring

Dynamic analysis of rotating satellite de-spun using <?A3B2 ACK?>flexible brush

“…随着人类对太空的不断探索, 越来越多的废弃卫 星产生, 给今后的太空活动带来了很多弊端 [1][2][3][4] . 随着 太空垃圾逐步被重视, 对于废弃卫星的抓捕成为人们 的重要研究方向, 并且为了减少自旋卫星抓捕过程的 复杂性, 自旋卫星的消旋过程变得格外的重要 [5] .…”

Methodology for characterizing high-risk orbital debris in the geosynchronous orbit regime

“…The following metric for quantifying longitude-dependent orbit debris congestion at GEO is discussed in detail in Anderson and Schaub (2013), and is summarized in this section for convenience. "Near-miss events" for the GEO longitude slots are determined by formulating a GEO-encompassing torus with major radius r GEO " 42164 km and minor radiusr, partitioned into longitude increments of ∆λ " 1.0˝ (Anderson and Schaub, 2013).…”

“…Therefore, studies of the macroscopic behavior of the GEO debris population are required to describe debris fluxes through particular GEO longitude slots, and forecast how frequently operational assets in these regions must potentially perform maneuvers to mitigate conjunctions. Rather than presenting the high-precision analysis demanded by risk assessment and mitigation measures, this study builds upon the methods of Anderson and Schaub (2013), which illustrates a one-year, macroscopic congestion forecast for debris at GEO, to determine which localized regions of the GEO ring are, in general, most susceptible to rising levels of debris congestion. As overcrowding of this ring is growing into a serious concern for owners and operators internationally, knowledge of debris flux patterns-termed debris weather-is critical for space situational awareness activities at GEO.…”

“…Existing debris analysis tools (Lewis et al, 2001;Klinkrad, 2006) rely upon inertially-fixed cells to detect debris cell passage events (CPE), such that densities are often averaged over cell right ascension, and provided as a function of altitude and declination (Klinkrad, 2006). Following Anderson and Schaub (2013), this study harnesses a toroidal cell configuration in the GEO ring to investigate the impact of various classes of large-scale, uncontrolled objects on congestion and risk levels from a longitude-dependent perspective. Small-scale debris sources such as explosion and collision events, although considered recently in Hansen and Sorge (2013) and Oltrogge and Finkleman (2008), are not considered in this study, nor are other growth mechanisms such as ejection of solid rocket motor (SRM) slag or shedding of multi-layered insulation (MLI) (Wegener et al, 2004).…”

“…In particular, methodology for identifying the objects that contribute the largest percentage to the total risk level accumulated either globally or locally during the forecasting period is presented. For ADR initiatives geared towards slot clean-up at particular longitudes, information such as that determined from debris simulations harnessing the torus intersection metric to evaluate longitude-dependent risk is especially useful in helping to determine which individual objects should be removed to maximize reduction in risk, either globally or across a defined subset of longitude slots, namely, in the vicinity of the high-impact and debriscritical gravitational wells positioned at 75˝E and 105˝W (Anderson and Schaub, 2013).…”