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Software breadboard study
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Frank, Mark Nuckolls, C. |
| Copyright Year | 1990 |
| Description | The overall goal of this study was to develop new concepts and technology for the Comet Rendezvous Asteroid Flyby (CRAF), Cassini, and other future deep space missions which maximally conform to the Functional Specification for the NASA X-Band Transponder (NXT), FM513778 (preliminary, revised July 26, 1988). The study is composed of two tasks. The first task was to investigate a new digital signal processing technique which involves the processing of 1-bit samples and has the potential for significant size, mass, power, and electrical performance improvements over conventional analog approaches. The entire X-band receiver tracking loop was simulated on a digital computer using a high-level programming language. Simulations on this 'software breadboard' showed the technique to be well-behaved and a good approximation to its analog predecessor from threshold to strong signal levels in terms of tracking-loop performance, command signal-to-noise ratio and ranging signal-to-noise ratio. The successful completion of this task paves the way for building a hardware breadboard, the recommended next step in confirming this approach is ready for incorporation into flight hardware. The second task in this study was to investigate another technique which provides considerable simplification in the synthesis of the receiver first LO over conventional phase-locked multiplier schemes and in this approach, provides down-conversion for an S-band emergency receive mode without the need of an additional LO. The objective of this study was to develop methodology and models to predict the conversion loss, input RF bandwidth, and output RF bandwidth of a series GaAs FET sampling mixer and to breadboard and test a circuit design suitable for the X and S-band down-conversion applications. |
| File Size | 4872771 |
| Page Count | 177 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19920021513 |
| Archival Resource Key | ark:/13960/t7sn53g2s |
| Language | English |
| Publisher Date | 1990-01-31 |
| Access Restriction | Open |
| Subject Keyword | Electronics And Electrical Engineering Phase Locked Systems Ultrahigh Frequencies Deep Space Field Effect Transistors Superhigh Frequencies Transponders Functional Design Specifications Radio Frequencies Down-converters Space Missions Breadboard Models Comet Rendezvous Asteroid Flyby Mission Digital Techniques Signal Processing Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
