Noise Figures of Radio Receivers

Friis, H.T.

doi:10.1109/jrproc.1944.232049

Cited by 698 publications

(266 citation statements)

References 4 publications

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“…where T 0 = 290 K = 24·6 dB-K. T sys for antenna plus receiver can be computed using the Friis formula (Friis, 1944). Typical N f values for state-of-the-art GPS receivers are between 2 and 4 dB.…”

Section: R O B E R To S a B At I N I T E R R Y M O O R E A N D C Hmentioning

confidence: 99%

A New Avionics-Based GNSS Integrity Augmentation System: Part 1 – Fundamentals

2013

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The aviation community has very stringent navigation integrity requirements that apply to a variety of manned and Unmanned Aerial Vehicle (UAV) operational tasks. This paper presents the results of the research activities carried out by the Italian Air Force Flight Test Centre (CSV-RSV) in collaboration with the Nottingham Geospatial Institute (NGI) and Cranfield University (CU) in the area of Avionics-Based Integrity Augmentation (ABIA) for mission-and safety-critical Global Navigation Satellite System (GNSS) applications. Based on these activities, suitable models were developed to describe the main causes of GNSS signal outage and degradation in flight, namely: antenna obscuration, multipath, fading due to adverse geometry and Doppler shift. Adopting these models in association with suitable integrity thresholds and guidance algorithms, the ABIA system delivers integrity caution (predictive) and warning (reactive) flags, as well as steering information to the pilot and electronic commands to the aircraft/UAV flight control system. These features allow real-time avoidance of safety-critical flight conditions and fast recovery of the required navigation performance in case of GNSS data losses. This paper presents the key ABIA concepts, architecture and mathematical models. A successive paper will address the ABIA integrity thresholds criteria and detailed results of a TORNADO simulation case-study. K E Y WO R D S1.

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Section: R O B E R To S a B At I N I T E R R Y M O O R E A N D C Hmentioning

confidence: 99%

A New Avionics-Based GNSS Integrity Augmentation System: Part 1 – Fundamentals

2013

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“…Using gains/losses and noise factors of the above mentioned components, noise factor per one tile was calculated as F ¼ 2:46 by equation (6). Thus, the calculated value and the measurement result reasonably agreed, and the theoretical model (3) was validated.…”

Section: Methodsmentioning

confidence: 68%

“…The noise factor per one tile is calculated with their circuit components by equation (6). In the 2DC tile circuit shown in Fig.…”

Section: Theoretical Modelmentioning

confidence: 99%

Noise factor of active-tile for two-dimensional communication

2017

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This paper presents theoretical analysis and empirical evaluation of noise factor of active-tile two-dimensional communication (2DC) system. 2DC uses a thin waveguide sheet for microwave propagation along the sheet. For implementing a room-scale 2DC, an active tile, which compensates signal loss with an active circuit and enables signal propagation across a number of sheets, has been proposed in our previous work. Although the signal strength is kept constant across the tiles, signal-to-noise ratio (SNR) decreases due to the noise factor of amplifiers. It determines the maximum number of 2DC tiles connected in series while providing a required SNR. The paper shows SNR formulation using the noise factor of each active tile and the number of tiles in a series connection. Based on it, the maximum number of tiles connected in series with a required overall SNR is determined.

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“…For a cascade of the multiple-stage receiving systems, F s (f) can be determined by the well-known Friis formula [6] i.e.,…”

Section: The Effective Noise Figurementioning

confidence: 99%

Amplification of ultrawideband signals

Namgoong

Lerdworatawee

2003

ICCAD-2003. International Conference on Computer Aided Design (IEEE Cat. No.03CH37486)

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One of the main implementation challenges in the ultrawideband (UWB) radio is the design of efficient amplifiers. The difficulty in amplifying an UWB signal stems from its bandwidth being a large fraction of the amplifier gain-bandwidth product. This paper describes a methodology and the tradeoffs associated with the design of UWB amplifiers. The amplifiers are designed to minimize a new performance metric, which we refer to as the effective noise figure (NF). The effective NF measures the degradation caused by the amplifier in the achievable receiver performance after the digital decoding process, which is ultimately the most relevant measure of performance.

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Noise Figures of Radio Receivers

Cited by 698 publications

References 4 publications

A New Avionics-Based GNSS Integrity Augmentation System: Part 1 – Fundamentals

A New Avionics-Based GNSS Integrity Augmentation System: Part 1 – Fundamentals

Noise factor of active-tile for two-dimensional communication

Amplification of ultrawideband signals

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