Abstract
Numerous scientific discoveries have resulted from nearly six decades of radio science (RS) investigations throughout the Solar System. Requirements driving the RS design and cost of the investigation typically include: performance of the end-to-end radio system (e.g., fractional frequency stability), dynamical stability of the spacecraft, required calibration techniques, and any special instrumentation (e.g., dual polarizations). A key technology priority for the near future is the development of small spacecraft that can perform precision RS observations similar to those of large spacecraft via links to either the Earth or other spacecraft. Optical communication technologies are expected to be demonstrated on future deep space missions. The DSN is planning to support communications with optical links starting with a technology demonstration on the NASA Psyche asteroid mission. The chapter describes possible improvements to water vapor radiometry and attempt to characterize the antenna’s mechanical noise.
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