Keyword: Radar

Briefs: Electronics & Computers

This innovation is a wideband, high-power, high-efficiency, all-solid-state microwave power module (SSMPM) or amplifier for a multifunction spacecraft payload that operates,...

Briefs: Information Technology

The Mississippi Evacuation and Traveler’s Assistance (MSETA) system provides public assistance for emergency evacuation and tourism/travel. The MSETA system is composed of...

Briefs: Electronics & Computers
GaN Schottky Diode-Based Frequency Multiplier

State-of-the-art GaAs Schottky diode technology, which is being used for local oscillators (LOs) in heterodyne receivers and transmitters for radar applications, has limitations in terms of power-handling capabilities. That makes it difficult to generate necessary LO power to drive multi-pixel...

Briefs: Information Technology
Computer Modeling for Generation of Synthetic Radio Reflection-Transmission Tomography (RRTT) Data

Numerical algorithms capable of generating synthetic radio tomography data (reflection transmission data) for asteroids, comets, and other near-Earth orbits (NEOs) were developed. Future missions to main asteroid belt objects, NEOs, and other small...

Briefs: Information Technology
Implementation of a Terrain Radiometric Correction for UAVSAR

A paper discusses a calibration method suited to correct variations of UAVSAR (unmanned aerial vehicle synthetic aperture radar) backscatter with topography. To use radar backscatter to estimate forest biomass on terrain with slopes, it is necessary to remove the effect of topography....

Briefs: Physical Sciences
Image Processing Method To Determine Dust Optical Density

Image processing techniques for determining dust optical density in Apollo videos have been developed. The software generates histograms, and calculates the mean and standard deviation, which are then used to match dusty and clear images for the purpose of estimating an effective optical...

Briefs: Physical Sciences
Life-Detecting Radar

A new device detects the heartbeat and respiration of victims trapped in rubble or disaster debris, and reduces the time required to initiate a rescue. Searchers would like to distinguish live victims from those who have died recently and to distinguish humans from animals. In addition to search and rescue, there are other...

Briefs: Physical Sciences

Existing observing systems are inadequate to measure a variety of dynamic atmospheric processes. Ground-based or airborne systems do not observe over sufficiently large regions to capture...

Briefs: Information Technology
A Decision Support Tool to Assess Upper-Level Winds for Space Launch

An Excel-based graphical user interface (GUI) was developed for the 45th Weather Squadron (45 WS) Launch Weather Officers (LWOs), allowing them to assess numerical weather prediction model forecasts of upper-level winds and compare the forecasts to observations from Cape...

Briefs: Electronics & Computers
Quad First Stage Processor: A Four-Channel Digitizer and Digital Beam-Forming Processor

A 4-channel digitizer was designed, built, and tested. The very large, complex board enables SweepSAR. The proposed Deformation, Eco-Systems, and Dynamics of Ice Radar (DESDynl-R) Lband SAR instrument employs multiple digital channels to optimize resolution...

Briefs: Electronics & Computers
Ultra-Wideband, Dual-Polarized, Beam- Steering P-Band Array Antenna

A dual-polarized, wide-bandwidth (200 MHz for one polarization, 100 MHz for the orthogonal polarization) antenna array at P-band was designed to be driven by NASA’s EcoSAR digital beam former. EcoSAR requires two wide P-band antenna arrays mounted on the wings of an aircraft,...

Application Briefs: Test & Measurement

NASA has contracted ADC USA to design and build an Experimental Test Range (ETR) Positioning System that consists of positioning components for a state-of-the-art Radar Cross Section (RCS)...

Who's Who: Aerospace

Jim Lux is task manager on FINDER (Finding Individuals for Disaster and Emergency Response), a portable radar device that detects heartbeats and breathing of victims trapped...

Briefs: Sensors/Data Acquisition
Integrating a Microwave Radiometer into Radar Hardware for Simultaneous Data Collection Between the Instruments

The conventional method for integrating a radiometer into radar hardware is to share the RF front end between the instruments, and to have separate IF receivers that take data at separate times. Alternatively, the radar and radiometer...

Briefs: Sensors/Data Acquisition
High-Speed Data Recorder for Space, Geodesy, and Other High-Speed Recording Applications

A high-speed data recorder and replay equipment has been developed for reliable high-data-rate recording to disk media. It solves problems with slow or faulty disks, multiple disk insertions, high-altitude operation, reliable performance using COTS hardware,...

Briefs: Physical Sciences
Radar Range Sidelobe Reduction Using Adaptive Pulse Compression Technique

Pulse compression has been widely used in radars so that low-power, long RF pulses can be transmitted, rather than a high-power short pulse. Pulse compression radars offer a number of advantages over high-power short pulsed radars, such as no need of highpower RF...

Briefs: Physical Sciences

SweepSAR, a novel radar architecture that depends on a DBF (digital beamforming) array, requires calibration accuracies that are order(s) of magnitude...

Briefs: Test & Measurement
Hydrometeor Size Distribution Measurements by Imaging the Attenuation of a Laser Spot

The optical extinction of a laser due to scattering of particles is a well-known phenomenon. In a laboratory environment, this physical principle is known as the Beer-Lambert law, and is often used to measure the concentration of scattering particles in a fluid...

Briefs: Test & Measurement

Testing of victim detection radars has traditionally used human subjects who volunteer to be buried in, or climb into a space within, a rubble pile. This is not only uncomfortable, but can be...

Briefs: Information Technology

G-CAT is a covariance analysis tool that enables fast and accurate computation of error ellipses for descent, landing, ascent, and rendezvous scenarios, and...

Briefs: Software
Ionospheric Specifications for SAR Interferometry (ISSI)

The ISSI software package is designed to image the ionosphere from space by calibrating and processing polarimetric synthetic aperture radar (PolSAR) data collected from low Earth orbit satellites. Signals transmitted and received by a PolSAR are subject to the Faraday rotation effect as...

Articles: Software

A frequency selective surface that acts as an RF filter and helps reduce the radar cross-section of antennas consists of a pattern of geometrical objects. There are literally thousands of...

Briefs: Electronics & Computers
Forward-Looking IED Detector Ground Penetrating Radar

There have been many developments of mine or metal detectors based on ground penetrating radar techniques, usually in handheld or rover-mounted devices. In most mine or metal detector applications, conditions are in a stationary mode and detection speed is not an important factor.

Briefs: Electronics & Computers
Fully Printed, Flexible, Phased Array Antenna for Lunar Surface Communication

NASA’s future exploration missions focus on the manned exploration of the Moon, Mars, and beyond, which will rely heavily on the development of a reliable communications infrastructure from planetary surface-to-surface, surface-to-orbit, and back to Earth. Flexible...

Briefs: Physical Sciences
Hyperspectral Imager-Tracker

The Hyperspectral Imager-Tracker (HIT) is a technique for visualization and tracking of low-contrast, fast-moving objects. The HIT architecture is based on an innovative and only recently developed concept in imaging optics. This innovative architecture will give the Light Prescriptions Innovators (LPI) HIT the...

Briefs: Electronics & Computers

The Digital Beamforming Synthetic Aperture Radar (DBSAR) is an eight-channel phased array radar system that employs solid-state radar transceivers, a microstrip patch antenna, and a...

Briefs: Electronics & Computers
RF Reference Switch for Spaceflight Radiometer Calibration

The goal of this technology is to provide improved calibration and measurement sensitivity to the Soil Moisture Active Passive Mission (SMAP) radiometer. While RF switches have been used in the past to calibrate microwave radiometers, the switch used on SMAP employs several techniques...

Briefs: Electronics & Computers
Wireless Chalcogenide Nanoionic-Based Radio- Frequency Switch

A new nonvolatile nanoionic switch is powered and controlled through wireless radio-frequency (RF) transmission. A thin layer of chalcogenide glass doped with a metal ion, such as silver, comprises the operational portion of the switch. For the switch to function, an oxidizable...

Briefs: Lighting

If you want to create a moving light source, you have a few possibilities. One is to mount a light emitter in some kind of mechanical housing — the approach used in, for example, theatrical spotlights, which...