Investigation of the Performance Characteristics of Doppler Radar Technique for Aircraft Collision Hazard Warning: Phase III.
National Aeronautics and Space Administration, 1972 - Computer simulation - 139 pages
System studies, equipment simulation, hardware development and flight tests which were conducted during the development of aircraft collision hazard warning system are discussed. The system uses a cooperative, continuous wave Doppler radar principle with pseudo-random frequency modulation. The report presents a description of the system operation and deals at length with the use of pseudo-random coding techniques. In addition, the use of mathematical modeling and computer simulation to determine the alarm statistics and system saturation characteristics in terminal area traffic of variable density is discussed.
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SUMMARY AND CONCLUSIONS
APPLICATION OF PSEUDONOISE CODING TECHNIQUES
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127 bit code 25 seconds 25 secs alarm status alarm thresholds altitude approximately Atlanta data base Average percent bandwidth bit period calculated CD CD CD clock frequency closing velocity CM CM CM coordinates Doppler shift double differentiator output equation Flight paths Hour 11 data indicated input integrated PN interference power ratio interference ratio intruding aircraft largest signal levels and alarm low-pass filter Marginal probability MATRIX modified tau modulation n.mi Noise Figure noise power notch filter oscilloscope output is greater ownship transmitter pairs of aircraft plots PN code PN sequence Power level threshold probability density function radar range and closing range and range range rate real-time simulation relative range saturation factor shift register shown in Fig signal power signal-to-interference ratio signal-to-noise plus interference signal-to-noise ratio single sideband SNIR system parameters target technique terminal area Threshold based total dropout transponder output waveform