Citation
Abstract
As NASA moves to Ka-band (32-GHz) and optical deep space missions, adverse weather events threaten the completeness of the received data. A retransmission scheme can assure data completeness, but requires additional link capacity and storage. This article examines the fundamental trade-off between spacecraft buffer size and link capacity, and its effect on the data loss rate. Using a Markovian model to characterize the amount of data stored in the buffer, we found that (a) a large buffer size mitigates many problems associated with changes in mission data loss requirements and inaccurate link modeling, (b) more frequent but shorter passes reduce data losses but adds to the cost of spacecraft tracking and may violate the assumptions of the model, and (c) at short distances data loss process is dominated by the size of the buffer and equipment availability while at longer distances the process is dominated by the average link capacity.
Keywords
Details
- Volume
- 42-174
- Published
- August 15, 2008
- Pages
- 1–25
- File Size
- 623.5 KB