- 119 



D. Results of DPG Data Analysis 



1. Introduction 



Multiple sets of data were analyzed to determine the 

 integrity of the gravity wave information obtained from the DPG. 

 Although output was available from the facility's HF radar system, 

 there were no other functioning in - si tu directional wave monitors at 

 the FRF during the weeks after the instrument installation. Hence, 

 DPG directional information was compared with visual and radar 

 estimates. Wave height and period could, however, be compared with 

 CERC Baylor gauge data from near the end of the pier. The data were 

 also inspected for irregularities in the time domain that could 

 signal system malfunction. 



2. Time Domain Signal Analysis 



The five transducers' records corresponding to a single set 

 of wave data were input to the DPG software package and scanned for 

 signals beyond three standard deviations from the mean of the record. 

 The means were then re-calculated and subtracted from the records 

 which were then converted to pressure signals. (See Sections 

 IV. D. 1-3.) 



