Research and Development of Instrumentation Program, Evaluation of a General Purpose Muzzle Velocity Doppler Processor, the DBA Systems, inc. INVITE 512

摘要

The test item is a commercially manufactured microprocessor-based general-purpose doppler processor for muzzle-velocity measurement. This project was to determine the suitability of the test item for proving-ground instrumentation. The evaluation was conducted at Aberdeen Proving Ground from 29 July 1977 through 27 September 1979. Field and laboratory tests were conducted. It is concluded that (1) the second-order least squares fit used by the INVITE does not provide the accuracy and precision required for a proving-ground applications, (2) INVITE raw data processed separately using a first-order least squares fit does provide the accuracy and precision required for proving ground applications (better than 0.1%), (3) the doppler quality-check circuitry of the INVITE does not function properly, and (4) as presently programmed, the flexibility of the INVITE is inadequate. It is recommended that (1) the test item be used for data acquisition only (not processing), (2) all processing be done with a first-order fit, and (3) no additional systems be purchased. (Author)