Deep space Ka-band link management and Mars reconnaissance orbiter long-term weather statistics versus forecasting精品.pdfVIP

Deep Space Ka-Band Link Management and Mars Reconnaissance Orbiter: Long-Term Weather Statistics Versus Forecasting FARAMAZ DAVARIAN, SHERVIN SHAMBAYATI, AND STEPHEN SLOBIN Contributed Paper During the last 40 years, deep space radio communication sys- tems have experienced a move toward shorter wavelengths. In the 1960s, a transition from L- to S-band occurred, which was followed by a transition from S- to X-band in the 1970s. Both these tran- sitions provided deep space links with wider bandwidths and im- proved radio metrics capability. Now, in the 2000s, a new change is taking place: namely, a move to the Ka-band region of the radio frequency spectrum. Ka-band will soon replace X-band as the frequency of choice for deep space communications, providing ample spectrum for the high data rate requirements of future missions. The low-noise receivers of deep space networks have a great need for link man- agement techniques that can mitigate weather effects. In this paper, three approaches for managing Ka-band Earth–space links are investigated. The first approach uses aggregate annual statistics, the second one uses monthly statistics, and the third is based on Fig. 1. The minimum zenith sky noise temperature. the short-term forecasting of the local weather. An example of weather forecasting for Ka-band link performance prediction is Earth. Whereas in the early days spacecraft were designed to presented. Furthermore, spacecraft commanding schemes suitable transmit at a rate of a few kilobites per second from planetary for Ka-band link management are investigated. distances, future missions expect transmission rates of about Theses schemes will be demonstrated using NASA’s Mars Re- 1 Mb/s or more [1]. Therefore, deep space systems need to connaissance Orbiter spacecraft in the 2007–2008 period, and the