8:30 - 12:00, Tuesday, String 7
EXPANDED!  740A: OpenSource GPS Receiver I

Register for this tutorial  ~  Back to main tutorials page

Do you ever wonder what is really happening inside your GPS receiver? Would you like to investigate some interesting receiver applications and see the results in real-time? Participants will be introduced to the OpenSource GPS hardware and software and then begin real-time interaction with the receiver, including signal acquisition, I/Q processing, and carrier/code-loop tracking.

Dr. Clifford Kelley
Boeing
&
Mr. Frederick Niles
MITRE/CAASD

Introduction to the Open Source GPS Receiver
• Brief history of the Open Source GPS project
• GP2015 front end (down conversion frequency plan, analog to digital
  conversion)
• GP2021 Base band Processor (control, status, accumulate,
  miscellaneous registers)
• Hardware for open source software (ISA, PCI interface)

Receiver Software I
• Open Source Software Philosophy, Linux/DOS Program Structure,
  Data Structures
• Receiver Control Algorithms (initialization, main, display, channel
  allocation)
• GPS Interrupt Service Routine (Control, Search, Confirmation, Pull-    in , Tracking)
• Satellite location (almanac, ephemeris) algorithms
• Range Corrections (troposphere, ionosphere, satellite clock,
  relativistic effects)

Level: Assumes an understanding of GPS operation and measurements, also familiarity with signal theory and engineering analysis.

1:30 - 5:00, Tuesday, String 7
EXPANDED!  740B: OpenSource GPS Receiver II

Register for this tutorial  ~  Back to main tutorials page

740B is the Tuesday afternoon continuation of 740A tutorial on Tuesday morning. Please scroll up to the top of this page for 740A tutorial description.

Dr. Clifford Kelley
Boeing
&
Mr. Frederick Niles
MITRE/CAASD

Navigation performance
• Error Analysis (Ranging Error, Range Rate Error, Dilution of Precision,  Covariance analysis)
• Expected Performance
• Measured Performance (Position, Velocity, Time)

Receiver Software/Hardware Demonstration/Summary
• Compiling OpenSource GPS under DOS and Linux,
• OpenSource GPS Files setup (Input, Output, Input/Output)
• Running OpenSource GPS
• Documentation, Acquisition state, Pull-in state, Tracking state,
  Navigation
• Software translator to OpenSource GPS
• Other Projects (OpenGPS, GPL-GPS, GPSTK, USBGPS, NAMURU)
• New signals, FPGAs, Multiple frequency processing
• Review, Plans, Q&A

Level:  Introductory knowledge of GPS receiver operation is assumed, but receiver fundamentals will be covered briefly during real-time interaction with the OpenSource GPS Receiver.