Electronics & Software

Communications

Briefs : Communications
Providing a Real-Time Audible Message to a Pilot

An aircraft pilot would prefer to receive information on weather patterns, obstructions, and other conditions that may interfere with a flight plan, formal or informal, as the pilot’s flight proceeds, with a latency of no more than a few minutes. Learning of, and reacting to, a changing...

Briefs : Communications
Pass Plan Formatter (PPF) for Earth Sciences Ground Support System

The TRMM (Tropical Rainfall Measuring Mission) and Terra ESMO (Earth Science Mission Operations) Ground Systems needed a method of passing scheduling data through the Goddard Mission Services Evolution Center (GMSEC) bus to other subsystems without modifying the Planning and...

Briefs : Communications
Integrated Tool Archives, Extracts, and Analyzes Spacecraft Housekeeping Telemetry Data (GMSEC R3.0)

The Integrated Trending and Plotting System (ITPS) is a comprehensive tool for storage, extraction, analysis, and plots of spacecraft housekeeping telemetry data (GMSEC R3.0 — Goddard Mission Services Evolution Center). ITPS reports information...

Briefs : Communications
Low-Noise Analog APDs with Impact Ionization Engineering and Negative Feedback

Silicon avalanche photodiodes (Si APDs) have low dark current and low excess noise factor, and are currently used in many of NASA’s missions. Noise equivalent power (NEP) of 40 to 50 fW/(Hz)1/2 over 140-MHz bandwidth has been demonstrated for Si APDs. Si...

Briefs : Communications
Method to Improve Wireless System Communication Coverage in a Bended Tunnel Environment

The conventional methods of improving wireless system coverage performance are to increase the transmitter power and/or antenna gain. The high transmit power could lead to more power consumption and RF exposure issues. The use of a high-gain antenna could...

Briefs : Energy
Design for Improving the Flatness of Solar Sails

This work describes a discontinuous or segmented mirror whose overall flatness is less dependent on the limited tension that can be supplied by the booms. A solar sail is a large, nominally flat sheet of extremely thin reflectorized film rigidly attached to a spacecraft, enabling propulsion via...

News : Communications
Army Equips Stryker Unit With New Communications Technology

The Army's Stryker vehicle, designed to quickly move soldiers into a combat zone, is swift and mobile. Now its communications equipment will be, too.

Briefs : Software
Frame Synchronization Without Attached Sync Markers

In communications systems, there must be a method to identify the beginning of a message at the receiving end, to know when the data stream of a specified structure begins. This is conventionally done by inserting attached sync markers (ASMs) between codewords, and looking for these ASMs in the...

Products : Electronics & Computers
Serial Communication Cards

ACCES I/O Products, San Diego, CA, announced mPCIe-ICM Series PCI Express Mini Card isolated serial communication cards that measure 30 × 51 mm and feature a selection of four or two ports of isolated RS-232 serial communications. Features include 1.5kV isolation provided port-to-computer and 500V isolation...

Articles : Test & Measurement
Method for Performing GPS L1 C/A Measurements in Wideband Jamming and Interference

For effective range safety, global positioning system (GPS) metric tracking must be robust to interference with, and jamming of, GPS signals. The conventional approach to mitigating interference and jamming is to use a Controlled Reception Pattern Antenna (CRPA)....

News : Communications
Energy Harvesting Could Help Power Spacecraft of the Future

A consortium is working on a project to maximize energy harvesting on a spacecraft of the future. The initiative seeks to find energy-saving and -maximizing solutions to enable eco-friendly aircraft to stay in space for long periods of time without the need to return to Earth to...

Briefs : Communications
Automatic Dependent Surveillance Broadcast System for Traffic Situational Awareness

An integrated communications and control system for unmanned aircraft systems (UAS) utilizes automatic dependent surveillance broadcast (ADS-B) technology. The prime objective of this system is to address safety concerns related to UAS sharing airspace with...

Articles : Communications
E-Textile Antenna Tuning Stitches

A variety of antenna tuning techniques exist for conventionally constructed antenna structures, such that when an antenna is converted from a design to an actual fabricated structure, slight adjustments can be made to the fabricated structure to match the performance expected from the design. For microstrip...

Articles : Communications
Protograph-Based LDPC Bit-Interleaved Coded Modulation

Bandwidth and power-coded modulation schemes are very desirable for many applications in high-data-rate transmission over a given allocated bandwidth. The goal is to design such coded modulation system for a given throughput with the lowest possible signal-to-noise ratio for not only a...

Briefs : Imaging
Flight Imagery Recorder Locator (FIRLo) and High-Temperature Radome

LDSD (Low Density Supersonic Decelerator) is a Mars EDL (entry, descent, and landing) Technology Development Project that launches three test vehicles out of the Pacific Missile Range Facility in Kauai. On the test vehicle, most mission science data can be recorded safely on...

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