北极500 MHz非相干散射雷达空间碎片凝视探测的统计分析

对北极500 MHz非相干散射雷达2007年5月-2008年2月期间73天的空间碎片观测数据进行了统计分析.主要结果如下:1）共观测到88 679个空间碎片，每天平均约1 215个，每小时平均约50个；2）800~1 000 km的空间碎片数目明显多于其他探测距离门区域，空间碎片速度在-1.25~1.25 km/s对称分布，空间碎片尺寸主要分布在3~10 cm区间；3）从数天的短时间尺度来看，空间碎片分布特征变化较小；从数月的长时间尺度来看，空间碎片数量总体呈增加趋势，高度分布范围由集中逐渐扩散；4）860 km高度上的空间碎片数目出现时隔五个月的特别起伏变化；5）从地方时分布看，6-8LT和12-14LT空间碎片数目变密集.以上结论增加了对北极空间碎片分布特征的认识，对我国的空间碎片建模具有重要意义.

The statistics analysis of space debris in beam parking model based on the Arctic 500 MHz incoherent scattering radar

Space debris observation data based on the 500 MHz incoherent radar at 78°N are analyzed statistically. Main results are as follows:the total number of space debris observed are 88 679, about 1 215 per day and 50 each hour; the number of space debris in the range from 800 to 1 000 km is notably larger than others; the radial velocity almost distributed evenly in the range from -1.25 to 1.25 km/s; the effective diameter is about 3-10 cm. In the short period, the number distribution of space debris has little variations, but in the long period, the number of space debris show a increasing trend and the distribution coverage turn a little wider; the number of space debris reach the maximal from 6 to 8 LT and from 12 to 14 LT daily. The above results are helpful to understand the characteristics of space debris distribution in the Arctic and also important for the modeling and forecast of space debris.