Performance and Progress Report - John Doe FIX: put in the authors ...

USRD E27 transmitting. Examined the temporal variation
in the source level.
� Klein 5410 Measured the transmitted signal with the USRD E27
receiving for CW and FM pulses of 132 and 176 μs.
Measured receive beam patterns (across- and along-track)
of the bathymetric and sidescan channels with the USRD
E27 transmitting CW pulses of 132 and 176 μs.
Bathymetry from the Klein 5410:
The Center has been involved in exhaustive testing of the transducers on the 5410 so as to
better understand the feasibility of using the 5410 sidescan to simultaneously collect
hydrographic quality bathymetry. Based on the data collected at the Center, Klein agreed
to replace the port transducer under the system warranty. The plan was to conduct
Klein’s normal (qualitative) at sea testing of the system followed by qualitative testing to
be conducted in the Center acoustic test facility. Although the performance of the new
5410 port transducer for side scan imagery was exceptionally good, the new 5410 port
transducer did not function for bathymetry. The problem with the bathy performance was
determined to be a wiring error during the manufacturing. Consequently the tank tests
were not conducted on that transducer. Klein manufactured another port transducer for
the port side of the 5410. Due to ship scheduling both locally on the Gulf Challenger and
in Alaska on the NOAA Ship Fairweather, qualitative tank testing was conducted in
advance of qualitative testing at sea. The tank tests confirmed that the latest port
transducer provided by Klein for the 5410 was wired correctly. The horizontal beam
pattern of the port transducer was quite close to that for the starboard transducer; however
in the vertical axis there was a noticeable difference wherein the new port transducer has
a vertical asymmetry that is not present in the starboard transducer. The tank tests were
conducted by Jim Glynn with assistance from Glenn McGillicuddy and Barbara Kraft.
Despite the continuing problem with the port transducer, study of 5410 phase-based
bathymetric measurements proceeded. The study included developing processing
software specifically to handling the phase data from the 5410. The final field work that
was conducted this reporting period included a mini-survey in New York Harbor on a
launch from the NOAA Ship Thomas Jefferson. Evaluation of the bathymetric function
of the 5410 reached its projected plateau during this reporting period. This research is
described in the MS thesis of James Glynn. CCOM continues to work with Klein
Associates in their attempt to provide a fully operational port transducer for the 5410.
A related project is being carried out by graduate student Rebecca Conrad and Lloyd
Huff using the Boeing Australia Stabilizing Tail (BAST) – an active tailfin designed by
the Australian Navy for the Klein 5000 series sonars and sent to the Center for further
testing and improvement. The BAST was put through a sequence of tests which included
measurements conducted in the laboratory, in the tow tank, and in the field working from
the Gulf Challenger. The BAST must be continuously maintained by a source of
pressurized dry air to prevent intrusion of water via porous areas in its aluminum casting.
That has caused operational problems and consequently it has been decided not to install
a single board computer in the BAST for automatically stabilizing the “flight patterns”.
JHC Performance Report 24 30 January 2007