Design and practical implementation of multifrequency RF front ends using direct RF sampling

The use of direct RF sampling has been explored as a means of designing multifrequency RF front ends. Such front ends will be useful to multifrequency RF applications such as global navigation satellite system receivers that use global positioning system (GPS) L1, L2, and L5 signals and Galileo sign...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2005-10, Vol.53 (10), p.3082-3089
Main Authors: Psiaki, M.L., Powell, S.P., Hee Jung, Kintner, P.M.
Format: Article
Language:English
Subjects:
Analog-digital conversion
Applied sciences
Band pass filters
band-limited signals
Bandwidth
Carriers
Circuit properties
Design engineering
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Frequency conversion
Frequency filters
Geographic information systems
Global Positioning System
global positioning system (GPS)
Prototypes
Radio frequencies
Radio frequency
radio receivers
Radiocommunications
RF signals
sampled data systems
Sampling
Sampling methods
Satellite navigation systems
Satellite telecommunications. Space telecommunications
Signal convertors
Signal design
software radio
Telecommunications
Telecommunications and information theory
Transmitters. Receivers
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Summary:The use of direct RF sampling has been explored as a means of designing multifrequency RF front ends. Such front ends will be useful to multifrequency RF applications such as global navigation satellite system receivers that use global positioning system (GPS) L1, L2, and L5 signals and Galileo signals. The design of a practical multifrequency direct RF sampling front end is dependent on having an analog-to-digital converter whose input bandwidth accommodates the highest carrier frequency and whose maximum sampling frequency is more than twice the cumulative bandwidth about the multiple carrier signals. The principle of direct RF sampling is used to alias all frequency bands of interest onto portions of the Nyquist bandwidth that do not overlap. This paper presents a new algorithm that finds the minimum sampling frequency that avoids overlap. This design approach requires a multifrequency bandpass filter for the frequency bands of interest. A prototype front end has been designed, built, and tested. It receives a GPS coarse/acquisition code at the L1 frequency and GPS antispoofing precision code at both L1 and L2. Dual-frequency signals with received carrier-to-noise ratios in excess of 52 dB-Hz have been acquired and tracked using this system.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2005.855127