Strapdown Associates, Inc.
27 Judith Road, Needham, MA 02492
Tel: (781) 444-6073
Resume Publications Through April 2024
President: Paul G. Savage
Special Note: All Strapdown Associates technical publications listed below are now available free of charge as downloadable PDF files.
Strapdown Analytics, Second Edition
Strapdown Analytics II — Brochure
Strapdown Analytics II — Table of Contents
Errata For Strapdown Analytics I
Strapdown Lecture Notes (Yellow Book)
Strapdown Lecture Notes (Blue Book)
Strapdown Lecture Notes (Blue Book) — Complete Book: pdf4
Strapdown Lecture Notes Availability
Recently Posted Articles
IMU Rotation And Translation Vector Outputs, SAI WBN-14033, April 22, 2024
New Velocity Matching Alignment Measurement, SAI WBN-14032, April 22, 2024
Why Optical And Mechanical Gyros Measure The Same Angular Rate Relative To Non-Rotating Inertial Space, SAI WBN-14031, December 21, 2022
Blazing Gyros — The Presentation, SAI WBN-14030, December 14, 2022
Selected Previously Published Articles
Free access — no subscription required.
INERTIAL NAVIGATION AND GRAVITY
Analytical Description Of Optical Gyros, SAI WBN-14024, April 3, 2019 (Updated November 6, 2022)
Redefining Gravity And Newtonian Natural Motion, SAI WBN-14002, May 21, 2014, Updated September 28, 2022
Improved Strapdown Inertial Measurement Unit Calibration Procedures, SAI WBN-14028, June 2, 2020
Simplified Description of Optical Gyros — A Rigorous Analytical Development Without Vector Calculus, SAI WBN-14027, May 23, 2020
Performance Analysis Of Strapdown Systems, SAI WBN-14011, June 2, 2015
Computational Elements For Strapdown Systems, SAI WBN-14010, May 31, 2015
Blazing Gyros — The Evolution Of The Strapdown Inertial Navigation Technology For Aircraft, SAI WBN-14009, May 29, 2015
INERTIAL SENSORS
Why Optical And Mechanical Gyros Measure The Same Angular Rate Relative To Non-Rotating Inertial Space, SAI WBN-14031, December 21, 2022
Blazing Gyros — The Presentation, SAI WBN-14030, December 14, 2022
Simplified Description of Optical Gyros — A Rigorous Analytical Development Without Vector Calculus, SAI WBN-14027, May 23, 2020
Analytical Description Of Optical Gyros, SAI WBN-14024, April 3, 2019 (Updated November 6, 2022)
Analytically Deriving How Ring Laser And Fiber Optic Gyros Measure Angular Rotation, SAI WBN-14023, November 1, 2019 (Updated March 31, 2020)
Ring Laser Gyros Vs Fiber Optic Gyros — Comparison Of Performance Characteristics, SAI WBN-14029, October 1, 2020
Digital Integration Algorithm Error For Band-Limited Random Process Inputs, SAI WBN-14018, June 26, 2017
Fixed Gain Digital Filter Design For Specified Phase Versus Frequency Response, SAI WBN-14004, June 29, 2014
Modern Strapdown Attitude Algorithms And Their Accuracy, Versus Accuracy Requirements For Unaided Strapdown Inertial Navigation, SAI WBN-14025, February 9, 2020
Down-Summing Rotation Vectors For Strapdown Attitude Updating, SAI WBN-14019, July 16, 2017
Skewed Sensor Failure Detection Using Parallel Navigation Solutions, SAI WBN-14017, June 16, 2016
Coarse Leveling Of INS Attitude Under Dynamic Trajectory Conditions, SAI WBN-14007, January 29, 2015
Schuler Oscillations, SAI WBN-14003, June 27, 2014
KALMAN INERTIAL AIDING
Designing An Extended Kalman Filter For A Stellar Aided Strapdown Inertial Attitude Reference, SAI WBN-14012, January 16, 2016
Second Order Kalman Filter Corrections For Nonlinear Problems, SAI WBN-14016a
Sensor Stability Testing, SAI WBN-14016b
Lever Arm Corrections During INS Transfer Alignment With Wide Angle Initial Heading Error, SAI WBN-14008, April 17, 2015 (Updated 09/05/16)
Moving Base INS Alignment With Large Initial Heading Error, SAI WBN-14006, October 3, 2014
Modifying The Kalman Filter Measurement To Mitigate Second Order Amplification In INS Velocity Matching Alignment Applications, SAI WBN-14005, July 15, 2014
Mitigating Second Order Error Effects In Linear Kalman Filters Using Adaptive Process And Measurement Noise, SAI WBN-14001, May 16, 2014
SYSTEM SIMULATION AND CALIBRATION TESTING
Generating Strapdown Specific-Force/Angular-Rate For Specified Attitude/Position Variation From A Reference Trajectory, SAI WBN-14026, April 21, 2020
RELATIVITY
Point-To-Point Relativistic Time Dilation For Inertial Navigation
Point-To-Point Relativistic Time Dilation With Earth Rotation
Humor
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