Citation
Abstract
Two models are provided of DSN 70-m antenna performance at Ka-band (32 GHz) and, for comparison purposes, one at X-band (8.4 GHz). The “baseline” 70-m model represents expected X-band and Ka-band performance at the end of the currently ongoing 64-m-to-70-m mechanical upgrade, The “improved” 70-m model represents two sets of Ka-band performance estimates (the X-band performance will not change) based on two separately. developed improvement schemes: The first scheme, a “mechanical” approach, reduces tolerances of the panels and their settings, the reflector structure and subreflector, and the pointing and tracking system, The second, an “electronic/mechanical”’ approach, uses an array feed scheme to compensate for lack of antenna stiffness, and improves panel settings using microwave holographic measuring techniques. Results are preliminary, due to remaining technical and cost uncertainties. However, there do not appear to be any serious difficulties in upgrading the “baseline” DSN 70-m antenna network to operate efficiently in an “improved” configuration at 32 GHz (Ka-band). This upgrade can be achieved either by a conventional mechanical upgrade or by a mechanical/ electronic combination. An electronically compensated array feed system is technically feasible, although it needs to be modeled and demonstrated. Similarly, the mechanical upgrade requires the development and demonstration of panel actuators, sensors, and an optical surveying system.
Details
- Volume
- 42-88
- Published
- February 15, 1987
- Pages
- 126–134
- File Size
- 638.7 KB