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Briefs
Aerospace

GPS-Enhanced Onboard Navigation System (GEONS)

The open-architecture flight software package provides solutions for onboard orbit determination.

Application Briefs
Test & Measurement

Navigation Unit

This contract paves the way for the mass production of navigation units for subsequent launches of VEGA-C and other space missions.

Briefs
Photonics/Optics

Navigation Measurement Software

This program provides a relative navigation capability for spacecraft, remotely operated terrestrial vehicles, and machine vision.

Briefs
Software

Characterizing Richness of Previously Unmapped Terrain and its Impact on Navigation Using 3D Range Sensors

Landers to small bodies such as comets and asteroids can use this program to estimate the terrain richness of the previously unmapped small body.

Application Briefs
Motion Control

Docking System Enables Safe Rendezvous in Space

The ESA has commissioned its industry partners to design a new docking system called the International Berthing and Docking Mechanism (IBDM).

Application Briefs
Photonics/Optics

Ray Optics Simulation of Inertial Navigation Systems

Attitude detection is a crucial element in aircraft and spacecraft navigation. The motion of an aircraft consists of a translational component (motion of its center of mass with respect to...

Briefs
Photonics/Optics

Characterizing Richness of Previously Unmapped Terrain and Estimating its Impact on Navigation Performance using 3D Range Sensors in Flight

Landers to large planetary bodies such as Mars typically use a secondary reconnaissance spacecraft to generate high-fidelity 3D terrain maps that are subsequently used for landing site selection and creating...

Briefs
Software

Spacecraft Guidance, Navigation, and Control Visualization Tool

G-View is a 3D visualization tool for supporting spacecraft guidance, navigation, and control (GN&C) simulations relevant to small-body exploration and sampling (see...

Briefs
Information Technology

Safe Onboard Guidance and Control Under Probabilistic Uncertainty

An algorithm was developed that determines the fuel-optimal spacecraft guidance trajectory that takes into account uncertainty, in order to guarantee that mission safety constraints are satisfied with the required probability. The algorithm uses convex optimization to solve for...

Briefs
Information Technology

Autonomous GN&C for Spacecraft Exploration of Comets and Asteroids

A spacecraft guidance, navigation, and control (GN&C) system is needed to enable a spacecraft to descend to a surface, take a sample using a touch-and-go (TAG) sampling approach, and then safely ascend. At the time of this reporting, a flyable GN&C system that can...

Briefs
Software

NAIF Toolkit — Extended

The Navigation Ancillary Information Facility (NAIF) at JPL, acting under the direction of NASA’s Office of Space Science, has built a data system named SPICE (Spacecraft Planet Instrument C-matrix Events) to...

Briefs
Software

Video-Game-Like Engine for Depicting Spacecraft Trajectories

GoView is a video-game-like software engine, written in the C and C++ computing languages, that enables real-time, three-dimensional (3D)-appearing visual representation of spacecraft and trajectories (1) from any perspective; (2) at any spatial scale from spacecraft to Solar-system...

Briefs
Software

Spacecraft Attitude Maneuver Planning Using Genetic Algorithms

A key enabling technology that leads to greater spacecraft autonomy is the capability to autonomously and optimally slew the spacecraft from and to different attitudes while operating under a number of celestial and dynamic constraints. The task of finding an attitude trajectory that...

Briefs
Electronics & Computers

Deep-Space Ranging Using Pseudonoise Codes

A report discusses aspects of a ranging system in which the distance between the Earth and a spacecraft is determined from the difference between the phases of (1) modulation on a radio signal trans- mitted to the spacecraft and (2) a replica of the modulation transmitted back to Earth by a transponder...

Briefs
Physical Sciences

Using Rayleigh Scattering To Measure Spacecraft Attitude

Two reports describe a Rayleigh-scattering attitude sensor (RSAS) - an optoelectronic instrument for determining the orientation of a spacecraft. An RSAS comprises a telescope/video-camera/image-digitizer combination that is mounted on the spacecraft and that captures images of the limb of...

Briefs
Information Technology

Development of Flight Software for Small Explorer Spacecraft

A report describes a continuing program of development of flight software for the attitude-control system (ACS) and the command-and-data-handling (C&DH) system of a prototype standard spacecraft of the Small Explorer (SMEX)-Lite class. Both the C&DH and ACS parts of the...

Briefs
Information Technology

Program Generates Graphics To Help in Planning Space Flights

The Mission Planning Graphical Tool (MPGT) computer program provides a mouse-driven graphical representation of data on a spacecraft and its environment, for use in planning a space flight. MPGT is designed to be a generic software tool that can be configured to analyze any specified...

Briefs
Information Technology

Documents on Flight Software for the SAMPEX Spacecraft

A collection of four documents contains information on various aspects of the flight software of the Solar Anomalous and Magnetospheric Particle Explorer (SAMPEX) spacecraft. The first document is part of a longer paper that presents design requirements for the software; the information in...

Briefs
Software

Program for Conceptual Design of an Attitude-Control System

A report describes the ACS Design Tool - a Macintosh- and PC-based computer program for evaluating conceptual designs of a spacecraft attitude-control system (ACS) within a computation time of about 15 minutes. Services provided by the program include computation of ACS performance and...

Briefs
Mechanical & Fluid Systems

Software for Navigation of a Spacecraft Flying in Formation

The Spacecraft Autonomous Navigation System using GPS for Earth Orbiters (SANS-GEO) computer program is designed to perform the navigation calculations that will enable the New...