CONTENTS 



Page 



CONVERSION FACTORS, U.S. CUSTOMARY TO METRIC (SI) 8 



I INTRODUCTION 9 



II A SYSTEM FOR RECORDING WAVE DIRECTION BY RADAR 11 



III RADAR RESULTS 13 



1. Images of Single and Multiple Wave Trains 13 



2. Possible Measurements with Radar 15 



3. Methods for Analysis of Radar Photos 23 



4. Measurement Errors 23 



IV THEORY OF RADAR IMAGING 23 



1. Radar Resolution 25 



2. Scattering Mechanisms 26 



3. Role of Wind in Scattering 28 



4. Scattering from Wave Crests 28 



V VALIDATION 34 



1. Comparison with Aerial Photos 35 



2. Comparison with One-Dimensional Wave Spectra 41 



VI OTHER RADAR DEVICES AND DIRECTION MEASURING SYSTEMS 43 



1. Radar Devices 43 



2. Determination of Wave Direction from an Array of Sensors. 45 



VII DISCUSSION 45 



1. Additional Capabilities of CERC Radar System 45 



2. Future Plans 46 



VIII SUMMARY 47 



LITERATURE CITED 49 



TABLE 

 Comparison of information from CERC radar images with that 



obtained with other direction measuring devices 37 



FIGURES 



1 CERC radar image of waves in the Mission Beach area, San Diego, 



California, taken 29 March 1977 10 



2 Aerial photo of the Mission Beach area, San Diego, California, 



taken 29 March 1977 by a NASA U-2 aircraft in support of the 



West Coast Experiment 10 



3 CERC radar system as deployed at Mission Beach, San Diego, 



California, during the West Coast Experiment in March 1977. . . 12 



