Keyword: Spacecraft guidance

Briefs: Test & Measurement
The open-architecture flight software package provides solutions for onboard orbit determination.
Briefs: Motion Control
This program provides a relative navigation capability for spacecraft, remotely operated terrestrial vehicles, and machine vision.
Briefs: Aerospace
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
The ESA has commissioned its industry partners to design a new docking system called the International Berthing and Docking Mechanism (IBDM).
Application Briefs: Aerospace

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

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

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

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...