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 Oceanographic Measurements

      METRATEK can provide coherent measurement of the surface of the ocean from shore, laboratory/tank, or airborne platforms. Look-down measurements have been performed on the west coast, Chesapeake Bay, and on the Sognefjord in Norway. The radars have a wide range of waveforms: pulsed Doppler, linear FM, and pulsed Delta-K, all with or without frequency agility, widely variable pulse widths and pulse repetition frequencies, and comprehensive data recording systems. Parameters are as specified in the table at the bottom of the Model 200 radar page.       

nctrtruck

      METRATEK  has modified a 8 x 8 x 20-ft shipping container with insulation and air-conditioning to serve as a radar host or data processing van on field experiments. The container has a set of removable semitrailer wheels and can be shipped worldwide on ships or 747 air freighters.

      This photo was taken during Non cooperative Target Recognition tests conducted at Patuxent River Naval Air Station for the Defense Advanced Projects Research Agency.

sognefja

   

       This photo shows the Model 100 radar measuring internal waves in the Songnefjord in Norway. The waveform was a four-frequemcy Delta-K waveform with frequency agility from burst-to-burst. The waveform did an excellent job of detecting internal waves when they were there and, perhaps more importantly, did not detect anything when they were not there.

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X-Band Doppler of Internal Waves

PDK FFT Outputs for Internal Wave

      The Model 200, with its 4-foot minimum range capability, is especially suitable for wave tank measurements. Both of METRATEK's instrumentation radars are coherent and have pulse repetition rates in excess of 500,000 pulses per second, so that they can collect and store data from the moving ocean surface before it moves. The capability to switch antennas on a pulse-to-pulse basis permits collection of interleaved frequencies and polarizations so that direct comparisons between different frequencies of the polarimetric behavior of the ocean can be made. The wide variation in pulse widths (5 nanoseconds to 20 microseconds in 1-nanosecond steps) allows further freedom in varying spot size.

 Copyright  METRATEK, Inc. 1998, all rights  reserved    

Phone METRATEK at (703)-293-9040