• AUTOMATIC COMPUTER DATA BASE ENTRY AND SETUP OF A DECOMMUTATION SYSTEM

      Rogers, M. Kimberley; Lamb, Gina L.; Ashmore, James H.; Schuh, Richard A.; General Dynamics Convair Division; Loral Instrumentation (International Foundation for Telemetering, 1986-10)
      This paper presents a method developed to automate the data base entry and setup of the ADS 100 Decommutation System. Automation was accomplished by interfacing an existing RS-232C port with a VAX computer. Other available interface options are considered. The automated system provides a method for rapid data entry while minimizing errors. Automation also eliminates the continuing requirement for a skilled ADS 100 programmer. Additional topics reviewed are the various problems encountered while developing the interface. Also discussed is the development and interface of host computer software, including the predefined ADS 100 record structures. The final result is a complete and accurate digital data base setup in the ADS 100 system.
    • DECOMMUTATION OF ASYNCHRONOUS EMBEDDED DATA STREAMS

      Smith, Kevin; Windingland, Kim L.; General Dynamics Convair Division; Loral Instrumentation (International Foundation for Telemetering, 1986-10)
      Due to the increasing complexity of systems on which telemetry is used, the method of embedding a data stream within the main PCM data stream is becoming a popular means of acquiring subsystem data. However, this technique increases the complexity of the decommutating requirement in that the embedded stream must first be extracted from the main stream and then decommutated. One obvious solution would be to re-serialize the extracted data stream to be decommutated by a second set of frame and subframe synchronizers. This method suffers from increased system cost due to the additional hardware needed solely to support the embedded data stream. This paper will address an alternate method developed by Loral Instrumentation and an actual application at General Dynamics, Convair Division. This technique decommutates asynchronous embedded data streams via standard algorithms in a data compressor.
    • HELICOPTER FLIGHT TESTING and REAL TIME ANALYSIS with DATA FLOW ARRAY PROCESSORS

      Davis, Edward L.; Grahame, William E.; Loral Instrumentation (International Foundation for Telemetering, 1986-10)
      When flight testing helicopters, it is essential to process and analyze many parameters spontaneously and accurately for instantaneous feedback in order to make spot decisions on the safety and integrity of the aircraft. As various maneuvers stress the airframe or load oscillatory components, the absolute limits as well as interrelated limits including average and cumulative cycle loading must be continuously monitored. This paper presents a complete acquisition and analysis system (LDF/ADS) that contains modularly expandable array processors which provide real time acquisition, processing and analysis of multiple concurrent data streams and parameters. Simple limits checking and engineering units conversions are performed as well as more complex spectrum analyses, correlations and other high level interprocessing interactively with the operator. An example configuration is presented herein which illustrates how the system interacts with the operator during an actual flight test. The processed and derived parameters are discussed and the part they play in decision making is demonstrated. The LDF/ADS system may perform vibration analyses on many structural components during flight. Potential problems may also be isolated and reported during flight. Signatures or frequency domain representations of past problems or failures may be stored in nonvolatile memory and the LDF/ADS system will perform real time convolutions to determine the degrees of correlation of a present problem with all known past problems and reply instantly. This real time fault isolation is an indispensable tool for potential savings in lives and aircraft as well as eliminating unnecessary down time.