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mm07_slides - NAVCOM GPS Receiver Technology Receiver...

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Unformatted text preview: NAVCOM GPS Receiver Technology Receiver Front-ends I: Signals and Imperfections Original slides made by Ragnar V. Reynisson R adio Frequency I ntegrated S ystems and C ircuits Division 2006 Danish GPS Center 2 NAVCOM Agenda • Receiver Basics • Description of electrical signals • Noise • Linearity/Distortion • Receiver Figures of Merit (FoM) • Summary 2006 Danish GPS Center 3 NAVCOM Receiver Basics • The purpose of the receiver is to: ”Separate information from carrier signal, keeping signal quality above predetermined minimum” ”Separate information from carrier signal, keeping signal quality above predetermined minimum” A radio receiver front end lies between the antenna and the baseband signal processing (digital or analog). For a GNSS receiver the right border is the intermediate frequency RF Front-end Signal processing Information Radio signal Position NAVCOM Description of electrical signals 2006 Danish GPS Center 5 NAVCOM Signals (1) • An RF signal is divided in two distinct parts: – Carrier signal – Modulation (Information) • The carrier signal is a sine wave which amplitude and frequency depends on the system (standards & regulations) • The modulation is a time-dependent variation in signal phase, frequency and/or amplitude which carries the actual information content in the signal 2006 Danish GPS Center 6 NAVCOM Signals (2) • An ideal signal can be expressed in several ways: In-phase/Quadrature In-phase/Quadrature Polar Polar Complex Envelope Complex Envelope Complex Envelope 2006 Danish GPS Center 7 NAVCOM Signals (3) • All three representations are equivalent. • The conversion between I/Q and A/P is written as: Polar b I/Q Polar b I/Q I/Q b Polar I/Q b Polar Complex envelope useful in representing the signal at baseband: Modulation diagrams, signal constellations, etc. 2006 Danish GPS Center 8 NAVCOM Signals (4) 0.2 0.4 0.6 0.8 1-1 1 I(t) In-phase/Quadrature 0.2 0.4 0.6 0.8 1-1 1 t Q(t)-1-0.5 0.5 1-1-0.5 0.5 1 Complex Envelope I(t) jQ(t) 0.2 0.4 0.6 0.8 1 0.5 1 Polar a(t) 0.2 0.4 0.6 0.8 1-1 1 t φ (t) [ π rad] 0.2 0.4 0.6 0.8 1-1-0.5 0.5 1 Signal ( ϖ = 50) t s(t) 2006 Danish GPS Center 9 NAVCOM Signals (5) Amplitude/Power/Energy Amplitude/Power/Energy Instantaneous Power Instantaneous Power Average Power Average Power Energy Energy 2006 Danish GPS Center 10 NAVCOM Decibel Units • In all literature regarding RF receiver technology,...
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This note was uploaded on 05/08/2011 for the course EE 7301 taught by Professor Dr.huang during the Spring '11 term at Ohio State.

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mm07_slides - NAVCOM GPS Receiver Technology Receiver...

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