STRAPPED DOWN SYSTEMS - Storming Media

System Analysis and Design of a Low-Cost Micromechanical Seeker System

JUN 2008

Authors: Brian J. Nagle; MASSACHUSETTS INST OF TECH CAMBRIDGE

The full text of this report is not available and therefore is not for sale. This information is provided for reference purposes only.

Precision guided targeting systems have been in use by the U.S. military for the last half-century. The desire for high targeting accuracies while maintaining minimal collateral damage has driven the implementation of guidance systems on a myriad of different platforms. Current seeker systems using global positioning system (GPS)-aided technology offer good accuracy, but are limited by an adversary's signal jamming capabilities and the dynamic nature of the military target environment. ...

Advances in Navigation Sensors and Integration Technology (Les avancees en matiere de capteurs de navigation et de technologies d'integration)

FEB 2004

Authors: NATO RESEARCH AND TECHNOLOGY ORGANIZATION NEUILLY-SUR-SEINE (FRANCE)

This Lecture Series presented the current state-of-the-art in navigation sensors and integration technology through the improved use of advanced low-cost navigation sensor technologies. The following topics were covered: * Future of inertial sensors/integrated systems * Advances in gyro technology * Strapdown system computational elements * Strapdown system performance analysis * System integration principles * Innovative MEMS navigation applications * Advanced Sensor applications * Highly integrated systems.

Flight Demonstration Results of an Inertial Measurement Unit and Global Positioning System Translator Telemetry System

NOV 2001

81 pages

Authors: Bradford S. David; John A. Condon; T. G. Brown; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE

The full text of this report is available for sale.

The U.S. Army Research Laboratory (ARL) has been evaluating global positioning system (GPS) technology and strap-down inertial measurement units (IMUs) configured from inexpensive, miniature micro-electro-mechanical systems for the purposes of obtaining aerodynamics, trajectory reconstruction, and/or diagnostic information. A GPS translator from the Johns Hopkins University Applied Physics Laboratory and a low-cost IMU designed by ARL from commercial off-the-shelf components were combined with a telemetry system, packaged into a 2.75-inch HYDRA-70 ...

Modeling Jamming Effects on Rolling Airframe Missile

SEP 2001

Authors: Chia-Chun Yen; NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Development of countermeasures against infrared and optical guided missiles is enhanced by an ability to quantify the effects of the countermeasure. Analysts must be capable of accurately determining the attitude of the missile throughout its flight. This thesis describes the use of microelectronic-miniature (MEM) technologies to measure the strap down rates experienced by a rolling airframe missile and the model required to effectively determine the missile's attitude during its flight. ...

Propulsion and Energy: Solid Rockets

30 AUG 2001

6 pages

Authors: AIR FORCE RESEARCH LAB EDWARDS AFB CA

On November 16th, 2000 the culminination of an aggressive 23 month, jointly funded Integrated High-Payoff Rocket Propulsion Technology (IHPRPT) phase I Missile Propulsion program by the Air Force Research Laboratory Propulsion Directorate and Alliant Techsystems resulted in a highly successful full-scale rocket motor demonstration. This motor contained the most new technology on any one demonstration since the Trident I (C4) 25 years ago. The full-scale test incorporated new case, propellant, ...

6TH Saint Petersburg International Conference on Integrated Navigation Systems. (6eme Conference Internationale de Saint Petersbourg sur les Systemes de Navigation Integree)

OCT 1999

Authors: NATO RESEARCH AND TECHNOLOGY ORGANIZATION NEUILLY-SUR-SEINE (FRANCE)

The meeting proceedings from this 6th International Conference contains the Technical Evaluation Report and 25 papers presented by 61 authors working for 28 organizations from 9 countries. This Symposium on Integrated Navigation Systems was held in St. Petersburg, Russia on 24 to 26 May 1999. It was jointly organized by the Central Scientific and Research Institute "ELEKTROPRIBOR" and the Systems Concepts and Integration Panel of ...

Computer Modeling of Jamming Effects on Infrared Missiles

JUN 1999

56 pages

Authors: Troy M. Johnson; NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Development of effective countermeasures for use against infrared (IR) missiles is hindered by the difficulty inherent in testing tactical missiles. The designers of such a countermeasure must devise a means of reproducing missile attitude after the test flight to allow for further analysis. This thesis describes an Inertial Measurement Unit (IMU) compact enough to be mounted on board a 4.5 inch missile. The IMU sensing elements are three quartz rate ...

Optical Gyros and their Application (Gyroscopes Optiques et leurs Applications)

MAY 1999

Authors: D. Loukianov; R. Rodloff; H. Sorg; B. Stieler; NATO RESEARCH AND TECHNOLOGY ORGANIZATION NEUILLY-SUR-SEINE (FRANCE)

This AGARDograph is written by experts from France, Germany, Russia and the United States. Only the radical change of the political and military situation within the last decade made it possible to have the subject Optical Gyros covered by scientists and engineers from East and West. Until this change, Optical Gyros and their research and development were mostly handled as top secret. The more it can be seen as a ...

Aerospace China (Selected Articles)

01 APR 96

41 pages

Authors: NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH

Selected articles include: Thermal Control Technology of DFH-2A communication Satellite; Russia Maintains Its Military Superiority in Space; Major Space Activities of Space Shuttle Columbia On Its STS-52 Mission; Satellite Development Trends in Taiwan; and, Development of Strapdown Inertial Guidance. ANNOTATION: Aerospace China (Selected Articles)--Translation.

Optimal Design For A Type of Strap Down Terminal Guidance System

08 FEB 96

29 pages

Authors: Liu L. Zhihong; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH

This article studies a type of new model strap down terminal guidance system. It contains a strap down type guidance head, a set of strap down type inertial sensors, and in the three speed gyroscope and three line accelerometer are partially shared measurement components associated with navigation, guidance, and piloting instruments. The article presents a strap down terminal guidance design associated with the estimation of target status relative to missile ...

Slid Fire Control System Integrated Sensor Suite

8 pages

Authors: Ben S. Fraser; ROCKWELL INTERNATIONAL CORP DULUTH GA AUTONETICS MISSILES SYSTEMS DIV

Rockwell International Corporation has been developing a small, autonomous, active self defense system over the past four years under IR&D and government contract. One element of this system is a fully integrated fire control system that, in a small package, contains a full sensor suite for threat warning, tracking, and designation of threat missiles and projectiles Rockwell, under contract with the Defense Advanced Research Projects Agency (DARPA), is developing an ...

High Mobility Trailer (HMT) Transportability Testing

NOV 95

30 pages

Authors: Bradley J. Haas; ARMY DEFENSE AMMUNITION CENTER AND SCHOOL SAVANNA IL

The U.S. Army Defense Ammunition Center and School (USADACS), Validation Engineering Division (SIOAC-DEV), was tasked by U.S. Army Tank- automotive and Armaments Command (TACOM) to conduct evaluations on the M1102 High Mobility Trailer (HMT). This report contains the procedures, results, and recommendations from the tests conducted. A validated restraint method for the transport of ammunition loaded on the HMT via rail and on/off-highway was determined.

Development of an Acoustic Vorticity Meter to Measure Shear in Ocean- Boundary Layers

SEP 95

Authors: Fredrik T. Thwaites; MASSACHUSETTS INST OF TECH CAMBRIDGE

This thesis describes the analysis and development of an acoustic vorticity meter to measure shear in ocean boundary layers over smaller measurement volumes than previously possible. A nonintrusive measurement of vorticity would filter out irrotational motion such as surface waves and currents that can swamp small scale measurements of shear. The instrument measures three axis vorticity at 0.83 and 2.45 meters below the ocean surface with measurement volumes of 0.45 ...

Kalman Filter Estimation of Underwater Vehicle Position and Attitude Using a Doppler Velocity Aided Inertial Motion Unit

SEP 94

Authors: Daniel E. Leader; MASSACHUSETTS INST OF TECH CAMBRIDGE

This Paper explores the use of an extended Kalman filter to provide real-time estimates of underwater vehicle position and attitude. The types of previously available sensors are detailed including strapdown accelerometers, roll and pitch sensors, gyro and magnetic compasses, depth sensor, and various types of acoustic positioning systems. A doppler velocimeter is added to this sensor suite to imprnve the performance of the filter. As an integral part of the ...

Endo LEAP Flight Test Planning

06 JUN 1993

9 pages

Authors: E. Thomas Hill; BALLISTIC MISSILE DEFENSE ORGANIZATION WASHINGTON DC

The Atmospheric Interceptor Technology (AIT) program (formerly Endo LEAP) is focused on demonstrating strapdown seekers and strapdown guidance for very small miss distance intercepts at very high velocities against ballistic missiles within the atmosphere. This is being accomplished by advancing state- of-the-art technologies for small, lightweight, highly integrated kinetic energy kill vehicles (KV). Ground testing cannot fully duplicate the simultaneous interaction of the severe aerodynamic, aerothermal, and aero-optical conditions of ...

Ground Test Performance Validation of the Army LEAP Kill Vehicle

06 JUN 1993

7 pages

Authors: Buster Kelley; Paul Baker; ARMY SPACE AND STRATEGIC DEFENSE COMMAND HUNTSVILLE AL

The ground test plan for the Army LEAP kinetic Kill Vehicle (KV) is structured to validate all major subsystem performance prior to space flight missions. A carefully planned combination of lab, airbearing, strapdown and hover testing leads to a thorough and cost effective understanding of critical vehicle performance metrics. Simulation validation performed after each test enhances confidence for the subsequent tests with hover test data ultimately validating all aspects of ...

Performance Evaluation of the Honeywell GG1308 Miniature Ring Laser Gyroscope

JAN 93

Authors: M. F. Vinnins; L. D. Gallop; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)

This report describes the results of the performance evaluation of a Honeywell GG1308 miniature Ring Laser Gyroscope (RLG). The tests include turn-on and cold start, bias drift, scale factor, scale factor linearity, thermal transients and effects of dither compensation. The gyroscope demonstrated excellent high-rate performance although significant scale factor deviations were noted during temperature variations. Instrument design characteristics and areas of potential future investigation are also discussed.... Ring Laser Gyroscope(RLG), ...

Hybrid Guidance for Maneuvering Flight Vehicles

04 FEB 92

22 pages

Authors: Dehai Ling; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH

This article puts forward one type of guidance option related to the maneuver programing of reentering flight vehicles. The option in question makes use of a radiation sensing system, precisely determining the location of the starting point of the reentering flight vehicle. Use is also made of strap-on type inertial guidance systems to control the impact points of flight vehicles. Maneuvering flight is an important direction in the development of ...

Analysis, Design and Synthesis Methods for Guidance and Control Systems (Les Methodes d'Analyse de Conception et de Synthese Pour les Systemes de Guidage et de Pilotage)

JUN 90

Authors: ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)

The field of modern guidance and control systems has been raised to a very high level of capability because of the powerful high technology advances of the past several decades. This NATO AGARDograph captures the spirit of these powerful capabilities, and it is structured in 8 parts: These include: Integrated guidance and control systems; NAVSTAR/GPS Systems; Optical gyroscope and control systems; Integrated communication and navigation systems; Integrated navigation flight control ...

Biennial Guidance Test Symposium (14th) held in Holloman Air Force Base, New Mexico on 3-5 October 1989. Volume 1

30 OCT 89

495 pages

Authors: MUNITIONS SYSTEMS DIV (AFSC) EGLIN AFB FL

This symposium was directed toward the exchange of information, simulation of new ideas, and discussion of current techniques associated with the development and evaluation of inertial guidance and navigation systems. The papers presented included such topics as new test and calibration techniques for accelerometers and ring laser gyros, advances in flight reference systems, new test equipment, and new software developments. Keywords: Inertial measurement units, Inertial guidance, Strapdown systems, Global positioning ...

RTSIN1: A Model of a Strapdown INS on a Two-Axis Rate Table

JUL 89

26 pages

Authors: R. B. Miller; AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)

A two-axis rate table is very useful laboratory equipment for testing of strapdown inertial navigation systems (INS). In practice, tables are used both for angular positioning of the INS and for application of angular velocities about one or two axes. In the former, the INS may be aligned at some required attitude, and then rotated to some other attitude, and left there 'navigating' under the influences of gravity and earth ...

SINS1 - A Model of a Strapdown Inertial Navigation System

JUL 89

Authors: R. B. Miller; AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)

SINS1 is a simulation of a strapdown INS, written as a Fortran subroutine to be called at intervals by another program. Sensor errors, system initialization characteristics, and navigation algorithm operation may be selected by the user. Each call corresponds to the passage of a set time interval, and the calling program provides environmental dynamics information about the angular velocity of, and specific force on, the simulated INS. As required by ...

Development of Fluidic Guidance for KEW (Kinetic Energy Weapon) Projectiles

30 DEC 88

77 pages

Authors: Tadeusz M. Drzewiecki; Allen B. Holmes; Edward A. Packard; Raymond J. Kiernan; DEFENSE RESEARCH TECHNOLOGIES INC ROCKVILLE MD

In order for KEW projectiles to reliably destroy hostile ICBMs they must use some form of guidance. To be practical, KEWs must be lightweight, able to withstand high g forces, and insensitive to nuclear and electro-magnetic effects. Laser command guidance can guide a KEW to a target 'basket' area whereupon a strapped-down seeker can guide for a hit-to-kill. Key elements of such a KEW system are a laser detector/processor and ...

Hybrid State Estimators for the Control of Remotely Operated Underwater Vehicles

SEP 88

Authors: Gregory M. Vaughn; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

This thesis explores the use of 'hybrid' state estimators to increase the accuracy and flexibility of acoustic position measurement systems used to control underwater vehicles. Two different approaches to extend te range of acoustic position measurement systems are explored. The first uses an inexpensive strapdown inertial measurement system to augment the acoustic with inertial position information. This approach is based on experience gained using an attitude and inertial measurement package ...

A Fiber Optic Gyro Strapdown Reference System for Guided Weapons,

DEC 1987

Authors: D. Rahlfs; W. Auch; O. Glaser; D. Ruppert; STANDARD ELEKTRIK LORENZ A G STUTTGART (GERMANY F R)

Experience with the gyro error behaviour made during the development of fiber optic gyros (FOG) at SEL(Standard Electrik Lorenz) is stimulating a number of new system implementations. Among them use of FOGs within strapdown reference systems for guided weapons looks very favourable because of the high FOG bandwidth, its low noise operation and the absence of maneuver-dependent gyro-errors (as opposed to mechanical sensors). System design considerations lead to an integrated ...

An Analysis of DREO's (Defence Research Establishment Ottawa) Analog Rebalance Loops for the CSG-2 (Canadian Strapdown Gyroscope) Tuned-Rotor Gyroscope

JUL 87

Authors: Jeffrey S. Bird; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)

A high performance analog rebalance loop was designed for the Canadian Strapdown Gyroscope (CSG-2). This instrument is a potentially low cost, near inertial grade, two degree-of-freedom, tuned-rotor gyro designed and manufactured by Litton Systems Canada Ltd. under contract to DREO. The resulting loops are analyzed extensively from a control systems point of view with the examination of such properties as closed-loop stability, frequency and time responses and, to some extent, ...

Fluid Mechanics of Spinning Rockets

JAN 87

Authors: G. A. Flandro; W. K. VanMoorhem; R. Shorthill; K. Chen; M. Woolsey; UTAH UNIV SALT LAKE CITY FLUID DYNAMICS LAB

This report presents the results of a detailed investigation of the influence of time-dependent combustion gas flows on the attitude dynamics of spinning rocket propelled space vehicles. The work was motivated by a need to understand the origins of a potentially serious system performance problem first detected in the PAM-D series of spin stabilized upper stages. Small wobbling (often referred to as nutation or coning ) induced during separation of ...

Open-Loop Inertial Measurement Unit Error Analysis Monte Carlo and Root- Sum-Square

SEP 86

34 pages

Authors: James R. Thacker; Diane Simpson; ARMY MISSILE COMMAND REDSTONE ARSENAL AL GUIDANCE AND CONTROL DIRECTORATE

This report defines closed-loop and open-loop error analysis techniques commonly used in the aerospace industry. Equations for modeling inertial platform error sources (including accelerometers, gyros, and alignments) are also given. Correlation of data obtained by Monte Carlo techniques is compared to data generated by root-sum-square methods and shown for a typical ballistic missile. Finally, validation of the Open-Loop Error Analysis Program is verified by comparison to independent error analysis program ...

Guidance, Control and Positioning of Future Precision Guided Stand-off Weapons Systems

JUN 86

Authors: ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRANCE)

Partial contents: Tactical Operational Requirements--the unmanned aircraft as a force multiplier, Navy technology requirements for unmanned airborne vehicles; and Design/development tradeoffs to achieve a mission effective SOW(Standoff Weapon) Guidance System; Weapon Systems Concepts, Design Criteria and Integration Issues--Lethal air defense suppression technology base definition; and Midcourse guidance for the US Army's low cost fiber optic guided missile; Tactical Mission Planning and Management; Probabilities de collision de missiles de croisiere volante ...

Study of the Effects of Vibration on Inertial Navigation System Accuracy

JUN 86

124 pages

Authors: Donald J. Kocian; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

This study examines the effects of airframe vibration on the accuracy of a strapdown inertial navigation system. A stochastic model of the system error equations is included, as are two models of airframe vibration. software subroutines for model implementation in SOFE are included. A representative C- 130A flight profile was developed using a flight trajectory generator, PROFGEN. The system errors induced in the inertial navigation by simulating this mission are ...

Evaluation of the Collins/Rockwell Two Axis Gyro/Accelerometer Sensor Cluster (Phase III Unit)

OCT 85

40 pages

Authors: Chris Roberts; Aubrey Rodgers; ARMY MISSILE COMMAND REDSTONE ARSENAL AL GUIDANCE AND CONTROL DIRECTORATE

The Phase III Two-Axis Gyro/Accelerometer (TAGA) cluster is a strapdown IMU (Inertial Measurement Unit) with prelaunch self-calibration capabilities. The self-calibration mechanism allows for computer directed self tests which measure eight major performance parameters prior to launch. The purpose of this evaluation is to confirm performance stability of these eight parameters. The performance stability will decide the method of thermal compensation. (Author)

Laser Guidance with Triad Detector Array Strapdown Seeker

JUN 85

Authors: N. Kasikcioglu; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

The triad detector array strapdown seeker is designed to guide a bomb toward the target designated by a laser. The signal processor determines the error signals related to the error angles of the bomb body fixed X-axis from the target LOS. Error signals are employed as correction commands to the bomb control surfaces in order to keep the bomb in the target LOS. The complete system is simulated as a ...

Test Evaluation of the Honeywell GG1111 Single-Degree-of-Freedom (SDF) Strapdown Gyroscope

OCT 84

Authors: M. F. Vinnins; R. Apps; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)

Test results from the evaluation of a Honeywell GG1111 Single-Degree- of-Freedom Strapdown Gyroscope are presented. Tests include both static and constant-rate tests in servo and in analog-torque-to-balance modes. Results of multiposition drift tests, drift stability, cool-down sensitivity, temperature sensitivity, torque generator linearity, scale factor stability and torque generator sensitivity to IA rate changes are presented, described and discussed.

A Discussion of Coning Errors Exhibited by Inertial Navigation Systems

MAR 1984

Authors: D. J. Flynn; ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)

The mechanisms by which so called 'coning errors' occur in a strapdown inertial navigation system are explained by reference to a single mathematical theorem. Typical values of coning errors are derived and ae shown to be significant for a 1 nm/h inertial navigator. Various methods of evaluating and reducing coning errors are discussed. Originator-supplied keywords include: Dither; Ring laser gyroscope; and Vibration.

Acta Aeronautica et Astronautica Sinicia (Selected Articles)

04 JAN 1984

Authors: R. Sicong; Z. Yongkang; L. Zhongying; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH

Procedures for Static and Constant-Rate Tests on a Single-Degree-of- Freedom (SDF) Strapdown Gyroscope

OCT 1983

Authors: R. Apps; M. Vinnins; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)

Test procedures for testing a rate-integrating, Single-Degree-of- Freedom strapdown gyroscope are presented. Tests are restricted to static and constant-rate modes in both inertial reference servo and analog-torque-to- balance configurations. Alignment procedures and adopted sign conventions are discussed. Temperature control considerations are described. (Author)

Strapdown Navigation Algorithms Implemented in the Inertial and Geographic Frames

SEP 1983

Authors: D. F. Liang; R. H. Johnson; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)

This Canadian report presents two strapdown navigation software processing algorithms, one implemented in the inertial frame and the other in the local-level geographic frame. The presentation includes derivation of various mechanization equations to obtain positional and navigational information from input data provided by three gyros and accelerometers. Directional cosine matrix and quaternion update procedures together with initialization schemes are also presented. In the inertial frame implementation a new exact algorithm ...

Multisensor Calibration Procedure for an All Weather Short Range Air Defense System Concept

15 AUG 1983

Authors: W. L. McCowan; V. C. Lefevre; ARMY MISSILE COMMAND REDSTONE ARSENAL AL GUIDANCE AND CONTROL DIRECTORATE

A procedure for use in calibrating multisensor parameters for a missile in a level orientation is described in this report. This procedure is based upon a calibration procedure developed by Rockwell International for a vertically oriented missile. The gyro and accelerometer measurement equations, the iterative procedure used to calibrate the accelerometer parameters and the equations used to calibrate the gyro parameters are presented. A listing of the calibration process as ...

Dual-Seeker Measurement Processing for Tactical Missile Guidance

DEC 1982

174 pages

Authors: Andrew C. Weston; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

The available measurements from a strapdown seeker and a gimballed seeker onboard an air-to-ground anti-radiation missile are analyzed through an extended Kalman filter simulation. Detailed models of both seekers are developed. Only angular measurements are assumed available from the seekers: angle measurements from the strapdown seeker and angle and angle-rate measurements from the gimballed seeker. A 6-state extended Kalman filter model is used to estimate the ground target's position and ...

Azimuth Transfer Scheme for a Strapdown Inertial Measurement Unit.

26 AUG 1982

Authors: Harold V. White; DEPARTMENT OF THE ARMY WASHINGTON DC

The system for aiming of a missile strapdown Inertial Measurement Unit for cases in which the IMU does not possess the capability of self-aiming involves no mechanical link between northfinder and IMU which would require uncoupling prior to launch to avoid expending the northfinder. The technique maintains an automatic, hands-off capability by use of a laser link for azimuth transfer rather than a manual, optical link. The northfinder and laser ...

Missile Azimuth Aiming Apparatus.

23 DEC 1981

Authors: Harold V. White; DEPARTMENT OF THE NAVY WASHINGTON DC

Apparatus for fast, accurate aiming of a missile from a launch vehicle. The apparatus permits fast accurate aiming of a missile inertial measurement unit for cases in which the inertial measurement unit does not possess required performance capability for self-aiming. The apparatus involves no optical link and is not expended with the missile. (Author)

New Sensor Concepts: Low Cost Vibrating Beam Accelerometer

DEC 1981

Authors: W. C. Albert; SINGER CO FAIRFIELD NJ KEARFOTT DIV

Engineering model accelerometers have been assembled and tested to assess their potential for use in future strapped down inertial systems. The accelerometer concept investigated uses vibrating quartz crystal beams as the basic force sensing element. This concept has an inherent digital output and the potential for meeting the performance goals of bias stability of less than 100ug, scale factor stability less than 100ppm, input range at least 10g, bias temperature ...

Low Altitude Navigation Augmentation System

DEC 1981

Authors: D. Alexander Koso; CHARLES STARK DRAPER LAB INC CAMBRIDGE MA

The Low Altitude Navigation Augmentation Concept provides the pilot with an electronic map display on the aircraft's HUD, so that head down operations (looking at maps or moving map displays) are not required. In addition to the display concept, bearing measurements to known landmarks can be utilized to update the navigation system and also to estimate errors between the navigation system coordinate frame and the map coordinate frame. The concept ...

Advances in Inertial Navigation Systems and Components

APR 1981

Authors: Helmut Sorg; ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)

Contents: Tuned Gyro Cost Reduction through a Novel Hinge Design; Optical Rotation Rate Sensors; A Nuclear Magnetic Resonance Gyro using Noble Gas Isotopes; Hamilton Standard Superjet TM Solid State Fluidic Rate Sensor; The Cactus Accelerometer; Inertial System Alignment and Calibration on a Moving Base; and Identification and Determination of Strapdown Error-Parameters by Laboratory Testing.

Precision Positioning and Inertial Guidance Sensors. Technology and Operational Aspects

MAR 1981

Authors: ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRANCE)

A new class of precision positioning systems, including GPS (Global positioning systems), and MIDS (Multiple information distribution system) hold enormous significance to NATO systems effectiveness. This symposium addressed the status of such programs and the strap-down inertial technology which emerged as the core element in guidance and control. This meeting further addressed advanced filtering concepts for hybrid navigation systems, redundancy management, and operational requirements and concepts. (Author)

Sensitivity of the Steady-State Kalman Filters to Stability Derivatives Variations in an Inertial Navigation System.

SEP 1980

Authors: Jose Augusto; NAVAL POSTGRADUATE SCHOOL MONTEREY CA

In a tactical missile with mid-course guidance, an Inertial Navigation System (INS) is required. Strapdown INS using Steady-State Kalman Filters (SKF) as estimators has been suggested and this kind of INS is considered to be easier and cheaper to implement than the gimbaled INS. This thesis investigates one aspect of the INS problem: The sensitivity of the SKF to inaccuracies in the filter parameters such as the stability derivatives. The ...

Scale Factor and Noise Performance Tests of the Bendix Corporation Rate Gyro Assembly (RGA).

AUG 1980

Authors: Robert Kim; John Hoffman; ARMAMENT DIV (AFSC) EGLIN AFB FL

Three Bendix Corporation gyroscopes in a Rate Gyro Assembly (RGA) were tested at the Central Inertial Guidance Test Facility (CIGTF), 6585th Test Group, Holloman Air Force Base, New Mexico, from 29 May through 19 June 1980, for the National Aeronautics and Space Administration (NASA), Marshall Space Flight Center (MSFC), Huntsville, Alabama. The purpose of the tests was to characterize the noise performance of each gyro in the RGA in the ...

Documentation of Design, Performance, and Qualification of the SES Wave Profiling System,

JUN 1980

Authors: T. M. Rankin; R. L. Konigsberg; JOHNS HOPKINS UNIV LAUREL MD APPLIED PHYSICS LAB

This report describes the design, calibration, and laboratory qualification testing of the complete motion-compensated wave profiling system (except for the altimeter) as installed on the high-speed surface effect ship, the SEA-100A. It also describes the detailed design and analysis of the strapdown inertial motion compensation system used to remove vehicle motion from the altimeter signal. The system is necessary to achieve real-time on-board wave profiling. (Author)

A Method and Apparatus for Boresighting an Aircraft.

28 APR 1980

Authors: Jack Bates; Gary L. Petersen; Steven E. Ayler; DEPARTMENT OF THE NAVY WASHINGTON DC

An apparatus and method for boresighting an aircraft while it is on board an aircraft carrier is disclosed. Strapdown gyro triads are attached to pre-selected points on the aircraft and the item to be boresighted, and an electronics package containing a digital computer transforms the resulting cosine matrices. The operator reads a display and makes the necessary manual adjustments. (Author)

Lift-Dispersion Control of Spinning Reentry Vehicles.

10 APR 1980

Authors: D. H. Platus; AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS

A control system is described that will limit cross-range dispersion of spinning reentry vehicles caused by lift variations. The controls consist of small trim flaps or reaction jets that utilize information derived from strapdown motion sensors to minimize lift nonaveraging. Because epicyclic oscillations in angle of attack do not cause dispersion, only the phasing of complex angle-of-attack motion must be controlled to minimize the net transverse velocity that would otherwise ...