WorldCat Identities

Akos, Dennis M.

Overview
Works: 6 works in 9 publications in 1 language and 10 library holdings
Roles: Author
Classifications: TK6563,
Publication Timeline
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Most widely held works by Dennis M Akos
A software radio approach to global navigation satellite system receiver design by Dennis M Akos( )

2 editions published in 1997 in English and held by 3 WorldCat member libraries worldwide

A hybrid modulation for the VHF aeronautical channels by Dennis M Akos( )

2 editions published in 1992 in English and held by 2 WorldCat member libraries worldwide

Analyses for a Modernized GNSS Radio Occultation Receiver by Erin R Griggs( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

These studies range in magnitude and impact, and begin with a receiver development study using ground-based occultation data. Future RO constellations and collection opportunities were simulated and autonomous occultation prediction and scheduling capabilities were implemented. Finally, a comprehensive study was conducted to characterize the stability of the GNSS atomic frequency standards. Oscillator stability for a subset of satellites in the GNSS was found to be of insufficient quality at timescales relevant to RO collections and would degrade the atmospheric profiling capabilities of an RO system utilizing these signals. Recommendations for a high-rate clock correction network are proposed, which provides significant improvement to the fractional errors in the derived refractivity, pressure, and temperature values caused by the oscillator instabilities
GPS Software Radio. Direct RF Sampling Research by Dennis M Akos( Book )

2 editions published in 2002 in English and held by 1 WorldCat member library worldwide

The future satellite positioning navigation systems will provide civil signals on multiple frequencies, similar to that currently available only for the military pie. The multiple distinct frequencies will provide many advantages to users of the navigation systems. This report presents the development of a direct RF sampling front end design well suited for multiple frequency satellite navigation receiver design. No frequency down conversion is necessary, rather the particular frequency bands of interest are intentionally aliased using a wide band Maxim 104 analog-to-digital converter (ADC). The resulting samples are passed, via a buffering FPGA design, to the memory space of a host PC for storage as well as eventually processing of the multiple frequency transmission. This paper describes the design of the front-end, validates its concept with collected data. The system designed was demonstrated at Wright Labs and the developed hardware configuration/software was transferred was their use
A comparison of direct radio frequency sampling and conventional GNSS receiver architectures by Mark Lockwood Psiaki( )

1 edition published in 2005 in English and held by 1 WorldCat member library worldwide

A Comparison of "Direct RF Sampling" and "Down-Convert and Sampling" Global Positioning System (GPS) Front End Receiver Architectures( )

1 edition published in 2004 in English and held by 0 WorldCat member libraries worldwide

This report presents the final results of an investigation into direct radio frequency (RF) sampling receiver front ends and compares their performance to the traditional digital receiver front end designs. The distinction between the two implementations is that a direct RF sampling front end uses no analog frequency down conversion, rather the information bandwidth is aliased through the sampling process. This type of design significantly simplifies multiple frequency receiver design, important for receivers used in the Global Positioning System. However, the consequences of such an architecture are not fully understood as the technology required for their implementation has only recent become available. Past work has shown the feasible of the approach. This effort and report document the impact on the resulting phase noise, an important element in receiver design, as a result of the direct RF sampling
 
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