Browsing International Telemetering Conference Proceedings, Volume 55 (2019) by Title
Now showing items 77-80 of 80
VALIDATION PROTOCOL - THE MISSING PUZZLE PIECEIn multi-vendor T&E systems, a single hardware vendor cannot anticipate the dependencies on the settings from hardware manufactured by other vendors, or the systemic constraints that are specific to a particular customer. The T&E community has recognized the fact that MDL and TMATS XML are not sufficient to addresst his problem alone, and that there is a need for a separate, constraints language. Constraints written in such a language can be validated by a third party validation engine, without relying on any particular vendor’s software. To this end, we developed the concept of TACL, a candidate for the standard constraint language, and demonstrated it with a reference implementation of a TACL engine integrated with the iNET System Manager. In this paper, we argue that this integration should be standardized in the form of a Validation Protocol in order to turn the existing system into a loosely-coupled, standards-based architecture.
VERIFICATION TECHNIQUES FOR SPECTRUM USAGE IN SPACE, TIME AND FREQUENCYA Spectrum Usage Measurement System (SUMS) characterizes the actual use of telemetry spectrum at DoD flight test ranges. The system tracks daily usage in a measurements repository, which becomes an invaluable resource, allowing querying, reporting and analytics, for defending against future spectrum sell-offs, and for providing insights into improving spectrum efficiency. The question is how do we quantify spectrum usage in space, time and frequency? And how do we certify “actual usage”, as opposed to simple assignment and claims that the spectrum was planned to be used? We discuss techniques for addressing these challenges. The system draws upon spectrum mission planning data, a network of sensors of various types, and a correlation algorithm. A scaling problem wrt characterizing the spatial extent of the spectrum usage is solved. Correlation, using heterogeneous data sources at a test range with numerous RF emissions prompts a heuristics and flexible rules-based approach.
VIBRATION ANALYSIS WITH AN OPTICAL TRACKING SYSTEM (SISTRO)SisTro validation, required the execution of several Pit Drop tests. The determination of the store trajectory in real time, required the usage of advanced computer vision techniques for photogrammetric measurements and a novel optical calibration and error minimization process. As results the 2D image tracking of the in-view reference points could be determined with sub-pixel resolution. Then, in addition to providing the desired trajectory, it was able to compute the wing and pylon vibrations and its damping coefficient. Such capability allows us to develop a more accurate CFD simulation models by the incorporation of the aircraft Flexible-Body Mechanics model into such simulation runs. In this paper it will be presented the development of SisTrO sub-pixel tracking process and the pit drop test results, that includes the measurement of the wing and pylon vibrations and its associated damping.
WHY ARE WE HATIN’ ON ARTM CPM?Why hasn’t the Aeronautical Mobile Telemetry community adopted IRIG 106 compliant ARTM CPM as their preferred waveform for the transmission of telemetry data? Telemetry receivers in the market place today exhibit gains in detection efficiency and resynchronization speed that far exceed products of just a few years ago. Past papers have shown the link performance comparison between the new waveform standard SOQPSK-TG and ARTM CPM has narrowed since ARTM CPM was first standardized. This paper will present the latest performance comparison between these two waveforms during a controlled test throughout various flight conditions. The testing is presented and performance comparisons are made between the waveforms. This comparison will use traditional methods combined with several new performance metrics presented in this paper. To conclude, Link Availability, the measure of overall link performance is presented illustrating how closely these waveforms perform.