Browsing International Telemetering Conference Proceedings, Volume 54 (2018) by Subjects
Now showing items 1-3 of 3
ACCELERATING STANDARDS COMPLIANT TMNS RADIO IMPLEMENTATIONSIRIG 106-17 defines interoperable two-way network telemetry interfaces for the wired as well as the dynamic TDMA air interface. While the air interface is based on the familiar SOQPSK-TG waveform, a TmNS-based radio contains a dynamic TDMA MAC regulated by Link Management through the use of RFNMs. This paper illustrates the TmNS-based radio aspects of the IRIG standard by describing our experience utilizing a two-track approach for accelerated TmNS compliant radio development. We have divided the architecture by engineering discipline lines (Communications vs. Computer Engineering). Doing so allowed us to accelerate the design, simulation, and test tasks while using a common code base across various transceiver implementations. Discussion includes a description of the software modules that provide TmNS interfaces for standards compliant radio functionality such as the TDMA MAC, RFNM processing, system management, and MDL configuration as well as system-level integration testing.
Network Scheduling Algorithm with Efficient Backfill Process in the iNETOne of the major advantage of integrated Network Enhanced Telemetry (iNET) system is data backfill. In the iNET, network data server requests signal retransmission from the on-board recorder when the signal dropout is detected, and data is retransmitted which leads successful reception. If there are numerous test articles (TA), however, multiple backfill process for signal request and data retransmission can cause undesirable capacity waste. This paper describes the improved backfill process in iNET with multiple TAs. This process includes grouping and scheduling algorithm within TAs, and the orthogonal and non-orthogonal transmission. The system model and results are analyzed by simulation.
PERFORMANCE TEST OF INITIAL iNET-LIKE RF NETWORK USING HELICOPTER (2018)Kawasaki Heavy Industries, Ltd. (KHI) has been authorized to use S-band IP Transceivers since 2014 in Japan. We have been involved with tests for two-way high-capacity communication. We presented the results of the performance test using a helicopter at ITC2016. We continued further performance test in 2017-2018.