AZUSA TRACKING EQUIPMENT MAKR II CONSINE RATE SYSTEM
Final engineering rept.
GENERAL DYNAMICS/POMONA CALIF
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Two information channels were added to the AZUSA Mark II Radio Tracking Equipment. These channels provide ambiguous direction cosine information which can be processed in an IBM 709 computer with unambiguous cosine and range and ambiguous range information to yield higher-precision realtime velocity-vector data of the tracked target. The additional information can also be machineprocessed to remove ambiguities. The added channels use the same interferometer techniques embodied in the basic Mark II. To increase angular resolution, direction cosine values are based on phase measurements made at antennas spaced 500 meters apart. An antenna of the type used in the basic mark II was added to extensions of both the X and Y baselines. The major design problem, phase stability of the microwave local oscillator signals at the remote antenna mixers, was solved through use of a coaxial transmission system. Constancy of the coaxial cable transmission characteristics was obtained by locating the cable in the temperature-stable environment afforded by direct burial underground. Since the attenuation and phase characteristics increase with frequency, it was decided to transmit a submultiple of the microwave local oscillator signals through the cable. These signals, in the VHF range, are multipled 96 times at the remote antenna stations. Author