By V. Ashkenazi, M. E. Napier (auth.)
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Extra info for Oceanology: Proceedings of an international conference (Oceanology International ’86), sponsored by the Society for Underwater Technology, and held in Brighton, UK, 4–7 March 1986
Example text
1827. The standard A matrix for four ranges is (El_El)/Cl (Nl_Nl)/Cl] [(El_E2)/C 2 (Nl-N2)/C 2 (El_E2)/C 3 (Nl -N3)/C3 (El_E4)/C 4 (Nl -N4)/C4 CONCLUSIONS Conclusions from this exercise are mixed. Constant time offsets may be alleviated by the above method, perhaps automatically in realtime. However, asynchronous data with inconsistent time offsets would be difficult, even with human intervention or an artificial intelligence approach. Many newer ranging systems, including DNTl's, provide for external computer control such that data may be acquired and held until requested by a logging device.
Residuals are quite variable, so the 'running average technique' is a required analysis tool. 33 m for a GOINO-GO decision as determined during equipment calibration. The UHFB ranges are numbered 5 through 7 to avoid confusion with X-band, and ten residuals per group are used as above . 0979 For this typical straight-line UHFB run, the ranges are of sufficient quality to go forward with the system comparison. COMBINED SYSTEMS With regard to the anticipated 50 ms time skew, the first joining of the two systems was to expand the matrices and treat all incoming ranges as simultaneous.
1827. The standard A matrix for four ranges is (El_El)/Cl (Nl_Nl)/Cl] [(El_E2)/C 2 (Nl-N2)/C 2 (El_E2)/C 3 (Nl -N3)/C3 (El_E4)/C 4 (Nl -N4)/C4 CONCLUSIONS Conclusions from this exercise are mixed. Constant time offsets may be alleviated by the above method, perhaps automatically in realtime. However, asynchronous data with inconsistent time offsets would be difficult, even with human intervention or an artificial intelligence approach. Many newer ranging systems, including DNTl's, provide for external computer control such that data may be acquired and held until requested by a logging device.
