Keyword: Navigation and guidance systems

Application Briefs: Imaging

The use of geo-referenced imagery across the Internet is becoming prevalent thanks to the development of Web-based location servers such as Google Earth,...

Application Briefs: Sensors/Data Acquisition
Laboratory for Global Health Observation
University of Alabama at Birmingham, School
of Public Health
Birmingham, AL
Briefs: Physical Sciences

A mercury-ion clock now at the breadboard stage of development (see figure) has a stability comparable to that of a hydrogen-maser clock: In tests, the clock exhibited an Allan deviation of between 2...

Briefs: Electronics & Computers
Using Transponders on the Moon to Increase Accuracy of GPS

It has been proposed to place laser or radio transponders at suitably chosen locations on the Moon to increase the accuracy achievable using the Global Positioning System (GPS) or other satellite-based positioning system. The accuracy of GPS position measurements depends on the accuracy...

Briefs: Information Technology
Orchestrator Telemetry Processing Pipeline

Orchestrator is a software application infrastructure for telemetry monitoring, logging, processing, and distribution. The architecture has been applied to support operations of a variety of planetary rovers. Built in Java with the Eclipse Rich Client Platform, Orchestrator can run on most commonly used...

Who's Who: Photonics/Optics

While working on designing an X-ray navigation system for NASA's next-generation Black Hole Imager, Dr. Keith Gendreau, a physicist at the Goddard Space Flight Center,...

Briefs: Physical Sciences
Generic Helicopter-Based Testbed for Surface Terrain Imaging Sensors

To be certain that a candidate sensor system will perform as expected during missions, we have developed a field test system and have executed test flights with a helicopter- mounted sensor platform over desert terrains, which simulate Lunar features. A key advantage to this...

Application Briefs: Physical Sciences
TEGAM 1949-0001 ratio transformer
Geneva, OH

The EarthScope Project is an undertaking funded by the National Science Foundation in...

Briefs: Electronics & Computers
Switched Band-Pass Filters for Adaptive Transceivers

Switched band-pass filters are key components of proposed adaptive, software- defined radio transceivers that would be parts of envisioned digital-data- communication networks that would enable real-time acquisition and monitoring of data from geographically distributed sensors. Examples of...

Articles: RF & Microwave Electronics

Software techniques for use in the global positioning system (GPS)1,2 have recently captured the growing interest of communication and navigation...

Briefs: Mechanical & Fluid Systems
Launching Payloads Into Orbit at Relatively Low Cost

A report proposes the development of a system for launching payloads into orbit at about one-fifth the cost per unit payload weight of current systems. The system would be based on the formerly secret PILOT micro-satellite-launching system developed in response to the Soviet launch of...

Briefs: Electronics & Computers

A system of electronic hardware and software, now undergoing development, automatically estimates the location of a robotic land vehicle in an urban environment using a somewhat...

Briefs: Software
Improved Path Planning Onboard the Mars Exploration Rovers

A revised version of the AutoNav (autonomous navigation with hazard avoidance) software running onboard each Mars Exploration Rover (MER) affords better obstacle avoidance than does the previous version. Both versions include GESTALT (Grid-based Estimation of Surface Traversability...

Briefs: Software
Web-Based Real-Time Emergency Monitoring

The Web-based Real-Time Asset Monitoring (RAM) module for emergency operations and facility management enables emergency personnel in federal agencies and local and state governments to monitor and analyze data in the event of a natural disaster or other crisis that threatens a large number of people and...

Briefs: Electronics & Computers

A method of quickly collecting digital imagery of ground areas from video cameras carried aboard locally launched rockets has been developed. The method can be used, for example, to record...

Briefs: Software
SSRL Emergency Response Shore Tool

The SSRL Emergency Response Shore Tool (wherein “SSRL” signifies “Smart Systems Research Laboratory”) is a computer program within a system of communication and mobile-computing software and hardware being developed to increase the situational awareness of first responders at building collapses....

Articles: Communications

In celebration of the 30th Anniversary of NASA Tech Briefs, our features in 2006 highlight a different technology category each month, tracing the past 30 years of the technology, and continuing with a...

Briefs: Software
Computing Fault Displacements From Surface Deformations

Simplex is a computer program that calculates locations and displacements of subterranean faults from data on Earth-surface deformations. The calculation involves inversion of a forward model (given a point source representing a fault, a forward model calculates the surface deformations)...

Briefs: Electronics & Computers
An Alternative for Emergency Preemption of Traffic Lights

An electronic communication and control system has been developed as a prototype of advanced means of automatically modifying the switching of traffic lights to give priority to emergency vehicles. This system could be used alternatively or in addition to other emergency...

Briefs: Electronics & Computers
IMU/GPS System Provides Position and Attitude Data

A special navigation system is being developed to provide high-quality information on the position and attitude of a moving platform (an aircraft or spacecraft), for use in pointing and stabilization of a hyperspectral remote-sensing system carried aboard the platform. The system also serves to...

Briefs: Information Technology
Improved Solar-Radiation-Pressure Models for GPS Satellites

A report describes a series of computational models conceived as an improvement over prior models for determining effects of solar-radiation pressure on orbits of Global Positioning System (GPS) satellites. These models are based on fitting coefficients of Fourier functions of...

Briefs: Information Technology

An automated system to assist a General Aviation (GA) pilot in improving situational awareness of weather in flight is now undergoing development. This development is prompted by the observation...

Briefs: Electronics & Computers

In a proposed digital signal-processing technique, a radio receiver would control the phasing of a phased-array antenna to aim the peaks of the antenna radiation pattern toward desired...

Application Briefs: Electronics & Computers

DC-DC power systems
Blacksburg, VA
Briefs: Software
Estimating Total Electron Content Using 1,000+ GPS Receivers

A computer program uses data from more than 1,000 Global Positioning System (GPS) receivers in an Internetaccessible global network to generate daily estimates of the global distribution of vertical total electron content (VTEC) of the ionosphere. This program supersedes an older...

Briefs: Electronics & Computers

A method has been proposed for extracting information on the rate of rotation of an aircraft, spacecraft, or other body from differential Doppler shifts of Global Positioning...

Briefs: Electronics & Computers
Portable Airborne Laser System Measures Forest-Canopy Height

The Portable Airborne Laser System (PALS) is a combination of laser ranging, video imaging, positioning, and data-processing subsystems designed for measuring the heights of forest canopies along linear transects from tens to thousands of kilometers long. Unlike prior laser ranging...

Briefs: Physical Sciences

A method of determining the position and attitude of a body equipped with a Global Positioning System (GPS) receiver includes an accounting for the location of the nonunique phase...

Briefs: Electronics & Computers

Multiband dipole antennas based on hexagonal and pentagonal fractals have been analyzed by computational simulations and functionally demonstrated in experiments on prototypes. These...

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