Alexander Utter
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View article: Effect of GPS III weighted voting on P(Y) receiver processing performance
Effect of GPS III weighted voting on P(Y) receiver processing performance Open
Signal generation in the GPS III satellites employs weighted voting to combine the baseband P(Y) signal with both components of the baseband L1C signal on the in-phase part of the L1 carrier. Weighted voting employs majority voting with ps…
View article: Extreme Software Defined Radio – GHz in Real Time
Extreme Software Defined Radio – GHz in Real Time Open
Software defined radio is a widely accepted paradigm for design of reconfigurable modems. The continuing march of Moore's law makes real-time signal processing on general purpose processors feasible for a large set of waveforms. Data rates…
View article: On-Orbit Results from an Ultra-Low SWaP Black Silicon Star Tracker
On-Orbit Results from an Ultra-Low SWaP Black Silicon Star Tracker Open
In August 2019, two 1.5U AeroCube-10 satellites built by The Aerospace Corporation were deployed from a Cygnus resupply spacecraft. Each of the satellites has two star trackers which are many times smaller than commercially available alter…
View article: SatCat5: A Low-Power, Mixed-Media Ethernet Network for Smallsats
SatCat5: A Low-Power, Mixed-Media Ethernet Network for Smallsats Open
In any satellite, internal bus and payload systems must exchange a variety of command, control, telemetry, and mission-data. In too many cases, the resulting network is an ad-hoc proliferation of complex, dissimilar protocols with incomple…
View article: Optical communications downlink from a 1.5U Cubesat: OCSD program
Optical communications downlink from a 1.5U Cubesat: OCSD program Open
In this presentation, we discuss the first demonstration of a lasercom downlink from a LEO 1.5U 2.3 kg CubeSat to our optical ground station at The Aerospace Corporation in El Segundo, CA. Two vehicles, AC7-B&C, built under NASA's Optical …
View article: Optical communications downlink from a low-earth orbiting 15U CubeSat
Optical communications downlink from a low-earth orbiting 15U CubeSat Open
In this article, we present the first demonstration of an optical communications downlink from a low-earth orbiting free-flying CubeSat. Two 1.5U vehicles, AC7-B&C, built under NASA's Optical Communications and Sensors Demonstration (OCSD)…
View article: A CubeSat-Based Optical Communication Network for Low Earth Orbit
A CubeSat-Based Optical Communication Network for Low Earth Orbit Open
A common challenge in developing small-satellite-based Earth-observation (EO) missions is getting the data to the ground. Typically, most satellites download data via space-to-ground radio-frequency (RF) links, communicating directly with …