Browsing International Telemetering Conference Proceedings, Volume 43 (2007) by Title
Now showing items 111-114 of 114
A WIDEBAND CHANNEL MODEL FOR SHF-BAND TELEMETRY OVER WATERData recorded during multipath channel sounding experiments, conducted off the coast of Pt. Mugu Naval Air Station at 8.0 GHz was used to model the multipath interference at SHF band over water. The modeling results show that a three ray model consisting of line-of-sight propagation and two reflected propagation paths is a good fit for the measured channel frequency responses. The properties of the multipath reflections are determined by geometry and sea state. For calm seas, the first reflection is a large amplitude short-delay reflection whereas for rough seas, the first reflection has a smaller amplitude and longer delay. The second reflection has a smaller amplitude and larger delay when the sea is calm.
A WIRELESS NETWORK-BASED RFNET SOLUTION FOR FLIGHT TESTAn rfNET solution based on IEEE 802.11 wireless network is presented to perform one-way remote transmission of airborne instrumentation data and multi-channel video images in flight test by modifying the wireless network bridge and UDP protocol. Its architecture and structure is introduced briefly and the results of ground transmission test and flight demonstration transmission are provided. It also points out the major problems of this solution for engineering application and their solutions.
WIRELESS SENSOR SYSTEM FOR AIRBORNE APPLICATIONSAdding an instrumentation / telemetry system to a test article has historically required an intrusive installation. Power, wiring, and available space typically present significant challenges. There has been a long-standing need in the test and training community for a non-intrusive, flexible and modular instrumentation and telemetry system that can be installed on an aircraft or other test article without the need for permanent modifications. In addition, as available space in aircraft weapon bays, small weapons, and unmanned vehicles becomes a premium, the miniaturization of remote sensors and telemetry units becomes critical. This paper describes the current status of the Advanced Subminiature Telemetry System (ASMT) Initial Test Capability Project. It discusses the challenges that have been overcome in developing a wireless sensor network system for use in an airborne test environment. These include wireless sensor packaging design, selection of operating frequencies, COTS wireless devices, batteries, system synchronization and data bandwidth calculations. The paper will also document the progress to date including preliminary test results.
XML META-DATA EXPERIMENTSAs part of the technology upgrades driven by the iNet initiative, there is a need to establish a meta-data standard to describe configuration information for the system under test. The technology identified for such a standard is XML and XSD schemas. This paper presents findings from various experiments to import and export existing telemetry configuration information to XML based on the new Meta-data model. In addition, this paper will discuss the possible conversions to and from the existing IRIG TMATS standard.