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8:30
- 12:00, Monday, String 2
210A:
Weak Signal Tracking
& High-Sensitivity GPS for Indoors I
Register
for this tutorial ~ Back to main tutorials page |
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The
ever-increasing demand for position availability has forced receiver
manufacturers to adapt traditional signal tracking algorithms to
operate in weak signal or indoor environments. This 2-day course
covers the basic concepts of GPS receiver operation before
explaining how these methods are improved upon for use in weak
signal environments.
Heuristic, time domain and frequency domain explanations are given
where appropriate. Numerical examples are also included to further
illustrate certain ideas and concepts. Numerous real-world case
studies are also presented to emphasize and clarify various topics. |
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Dr.
Gérard Lachapelle & Dr.
Mark Petovello
University
of Calgary |
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GPS
Overview
GPS
Signal Structure
• RF propagation; Fresnel zones; reflection; refraction;
Attenuation;
modulation; pseudo-random noise (PRN) codes and their
properties;
frequency domain
• Overview; navigation information
Satellite Ranging Concept and Observables
• Pseudorange; Doppler;
Carrier Phase; Dilution Of Precision
• (DOP) and User Equivalent Range Error (UERE)
Error Overview and Differential Concepts
• Satellite, atmospheric,
multipath and noise, error reduction through
differencing, differencing methods
Link Budget
• Radiated power; free space
loss; received power; system
specifications
Estimation and Reliability
• Review of estimation
concept; measurement model; least squares;
Kalman filtering; system model; estimated accuracy;
residual
testing; statistical reliability; multi-dimensional
accuracy measure
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Level:
Moderately
detailed course intended for those interested in gaining an
understanding of GPS receiver operation in weak signal and indoor
environments, together with illustrative case studies. Knowledge in
Courses 110 A&B is assumed. |
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1:30
- 5:00, Monday, String 2
210B:
Weak Signal Tracking
& High-Sensitivity GPS for Indoors II
Register
for this tutorial ~ Back to main tutorials page |
| |
|
Dr.
Lachapelle & Dr.
Petovello |
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GPS
Receiver Operation I
Overview
• Block diagram; GPS receiver
performance issues; classes of GPS
receivers
RF Front End
• Antenna; local oscillator
(characterizing time scales, FTS, Allan
variance); preamplifier; Friss’ formula; C/No
and its relevance;
relationship between C/No and SNR; down
conversion and
frequency mixers; sampling
Signal Processing Overview
• Overall objectives; signal
acquisition; signal tracking; navigation
message demodulation; measurement generation;
navigation solution
Signal
Tracking & Measurement Generation
•
Objectives and limitations; Doppler removal; code correlation;
coherent accumulation; tracking loops (DLL, FLL, PLL);
measurement generation
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Level:
Knowledge gained in Course 210A is assumed in 210B; it is not
recommended that you omit 210A, as the course is taught as a
continuum. |
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8:30
- 12:00, Tuesday, String 2
210C:
Weak Signal Tracking
& High-Sensitivity GPS for Indoors III
Register
for this tutorial ~ Back to main tutorials page |
| |
|
Dr.
Lachapelle & Dr.
Petovello |
|
GPS
Receiver Operation II
Signal
Acquisition
• Objectives and limitations;
time and frequency search space; signal
detection and acquisition thresholds; possible
implementations;
factors affecting acquisition; signal reacquisition
Navigation Message Demodulation
• Bit synchronization; frame
synchronization; parity decoding;
obtaining GPS time
GPS
In Weak Signal Environments (High Sensitivity GPS)
Motivation
& Objectives
• E911/112 mandates; weak
signals; typical signal attenuations;
overview of how to handle weak signals
Extended Coherent Accumulation
• Navigation data; navigation
bit prediction; relevance of frequency
errors
Non-Coherent Accumulation
• Definition; squaring loss;
relevant factors affecting squaring loss;
weak signal exercises & examples
Signal Acquisition in Weak Signal
Environments
• Frequency bin size requirements; search space size; massive
parallel
correlation
Review
of Current Technologies
Assisted GPS & Aiding Information
• Self
aiding; external aiding options; overview of aiding standards
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Level:
Knowledge gained in Course 210A-B is assumed in 210C; it is not
recommended that you omit 210A-B, as the course is taught as a
continuum. |
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1:30
- 5:00, Tuesday, String 2
210D:
Weak Signal Tracking
& High-Sensitivity GPS for Indoors IV
Register
for this tutorial ~ Back to main tutorials page |
| |
|
Dr.
Lachapelle & Dr.
Petovello |
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High
Sensitivity GPS Receiver Implementation Issues
Possible
Problems
• Overview; increased
measurement uncertainty; poorer reliability;
multipath; echo-only signals; cross-correlation;
near-far problem
High
Sensitivity GPS Receiver Case Studies #1
Performance
assessment in urban canyon
Performance assessment under forest canopy
High
Sensitivity GPS Receiver Case Studies #2
Performance
assessment inside various buildings
Hardware
Simulator for HSGPS
Testing
procedures and results
• Tracking threshold; GPS
fading channel model; acquisition threshold;
re-acquisition threshold; dynamics testing
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Level:
Knowledge gained in Course 210A-C is assumed in 210D; it is not
recommended that you omit 210A-C, as the course is taught as a
continuum. |
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