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Michael J. Zemba

Publications and source records attributed to Michael J. Zemba.

5 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS2022

Optimizing Lunar Map Partitioning for Multipath Fade Loss Analyses

A methodology is presented pertaining to the run-time optimization of quasi-optical ray-tracing simulations. These shooting-and-bouncing ray methods are used for assessing multipath fade loss in cislunar communication links. Our approach employs partitioning lunar terrain maps in shapes that approximate two-dimensional projections of Fresnel zone cross-sections. This technique drastically reduces computational run-time without causing significant loss of simulation accuracy.

Digital elevation models↗
NASA NTRSDate not supplied

All-Metal Antennas for Lunar Exploration

In support of NASA's lunar exploration program, the feasibility of an all-metal antenna and its variants for communications and navigation is investigated. The all-metal antenna is of the short backfire type with a waveguide feed and generates a linearly polarized radiation. The investigation includes the design, fabrication, and characterization of the antennas. The paper summarizes the initial results of the investigation.

All-metal antennas↗
NASA NTRSDate not supplied

Lunar Surface Network Relay Terminal: A Lunar Communications Platform

This paper will discuss the development of a Lunar Surface Relay that will serve as a central terminal for lunar surface wireless communications (e.g., 3GPP, Wi-Fi) for surface assets to transmit and receive data back-and-forth with Earth through lunar orbital relays or direct with Earth. Four variations of a wireless surface terminal were designed with varying concepts of operation to assess mass, power, cost drivers, and trade-offs. The designs entailed one stationary platform and three mobile which provided interesting trade-offs. The terminals are powered for operation with either a radioisotope/battery power system or solar array/battery power system.

WiFi↗