Home

Free Space Optical Receiver for Data Detection and Radio Science Measurements

This technique is intended to save power, bandwidth, and scheduling demands on the spacecraft. NASA’s Jet Propulsion Laboratory, Pasadena, California For deep space communication systems, the decision of whether or not to suppress the transmitted carrier has always been an issue. For certain missions that use high data rates, the available bandwidth might be a limiting factor. In such cases, it is preferred to use a completely suppressed carrier system that is more bandwidth efficient.

Posted in: Briefs, TSP, Data Acquisition, Sensors

Read More >>

Precision Miniature Attitude Determination and Control System

The system is designed to function with a high degree of autonomy. Goddard Space Flight Center, Greenbelt, Maryland The MAI-400SS Space Sextant is a turnkey Attitude Determination And Control System (ADACS) for CubeSats and nanosatellites. It is an enhanced version of the MAI-400, which is a precision CubeSat ADACS incorporating three reaction wheels, three electromagnets, and an ADACS computer in a ½-U module. This Space Sextant version incorporates two star trackers to improve overall pointing knowledge to 0.02° or better. The star trackers feature “Lost In Space” attitude determination requiring no a priori information.

Posted in: Briefs, TSP

Read More >>

Combined Detection and Tracking of Moving Objects in Aerial Surveillance Images

NASA’s Jet Propulsion Laboratory, Pasadena, California This software implements a new probabilistic framework for integrated multi-target detection and tracking of small moving objects in image sequences, with specific application to tracking people in aerial images, in which image stabilization is inherently noisy.

Posted in: Briefs

Read More >>

Neo-Geography Toolkit (NGT) v2

Ames Research Center, Moffett Field, California The Neo-Geography Toolkit (NGT) is a collection of open-source software tools for the automated processing of geospatial data, including images and maps. It can process raw raster data from remote sensing instruments and transform it into useful cartographic products such as visible image base maps, topographic models, etc. It can also perform data processing on extremely large geospatial data sets (up to several tens of terabytes) via parallel processing pipelines. Finally, it can transform raw metadata, vector data, and geo-tagged datasets into standard Neo-Geography data formats such as KML.

Posted in: Briefs

Read More >>

Real-Time, In-Situ Determination and Monitoring of Hot- and Cold-Side Thermal Resistances in Thermoelectric Systems

Applications for this method using the current perturbation approach include automobile exhaust energy recovery and industrial process waste energy recovery systems. NASA’s Jet Propulsion Laboratory, Pasadena, California Thermoelectric (TE) energy recovery is an important technology for recovering waste thermal energy in high-temperature industrial, transportation, and military energy systems. TE power systems in these applications require high-performance hot-side and cold-side heat transfer to provide the critical temperature differential and transfer the required thermal energy to create the power output. Hot- and cold-side heat transfer performance is typically characterized by hot-side and cold-side thermal resistances, Rh,th and Rc,th, respectively. This heat transfer performance determines the hot-side temperature, Th, and cold-side temperature, Tc, conditions when operating in energy recovery environments with available temperature differentials characterized by an external driving temperature, Text, and ambient temperature, Tamb.

Posted in: Briefs, TSP

Read More >>

Physical Characterization of Radiated and Non-Radiated Materials to Temperatures Less than 50 K

Coefficient of thermal expansion and Young’s modulus of the materials are determined via custom analytical equipment that can allow temperatures down to 20 K. NASA’s Jet Propulsion Laboratory, Pasadena, California Solar-array panels will experience very low temperatures of 50 K for the proposed Europa Clipper Mission (ECM). Solar-array panels will also undergo thermal cycling from 50 K to 133 K during the mission due to Jovian eclipsing. Unfortunately, there was no knowledge of the physical properties of the materials planned to be used down to ≈50 K, making it difficult to assess their reliability under such extreme cryogenic temperature conditions.

Posted in: Briefs, TSP, Data Acquisition, Sensors

Read More >>

Worldview Satellite Imagery Browsing and Downloading Tool

Goddard Space Flight Center, Greenbelt, Maryland Worldview is a software tool designed for interactively browsing and downloading imagery from NASA’s Earth observing satellites. Building upon a set of open source mapping and user interface libraries, it provides an environment to visually discover interesting phenomena as observed by NASA satellites, then download the data for further analysis. It was originally designed to address the needs of the near-real-time applications community to provide relevant information for time-critical scenarios such as wildfire and flood management. As such, satellite imagery is available to be viewed in Worldview within four hours of observation; the imagery can be viewed in its highest, or native, resolution, and the imagery can be panned and zoomed rapidly through space and time to find the most relevant/cloud-free information available.

Posted in: Briefs, TSP

Read More >>