ANALYSIS OF ANGLE-OF-AREIVAL MEASUREMENTS 



211 



^^^■' Comparison ol Conipulcd lo 



Measured Angle of Arrival 



Tlic experi mental nieasurements of angle of ar- 

 rival seeurecl hy IJell Teleplione Laboratories and tlie 

 meteoruiogieal data obtained on the -iOO-ft tower in 

 Oalihnrsl, have been analyzed to determine wlrether 

 any signifieant correlations exist between the meas- 

 ured angles of arrival at the Beer's Hill receiver and 

 the angles of arrival computed from meteorological 

 data. A grand synthesis is presented in Figure 8 of 



all <lays I'oi- which both iiTL propagation measure- 

 ments and Signal Corps tower meteorological sound- 

 ings were a\ailable for comparison. SiiU'e simultaneity 

 in radio and meteorological measurements was a rare 

 occurrence, the angle of arri\al e\aluations from both 

 sources of data are plotted along a time scale (in 

 hours) for each day of the period. The angle evalua- 

 tions from radio data are represented by circles; 

 angles calculated from the meteorological data are 

 represented by crosses of time length equal to the 

 duration of sampling of the layer between transmitter 



HUNDREDTHS OF DEGREE 

 -20 -10 10 20 30 40 



HUNDREDTHS OF DEGREE 

 -20 -10 10 20 30 40 



8 

 >.I0 

 ^12 

 2 14 

 = 16 

 18 



8 



10 



5l2 



il4 



N 16 



18 



20 



8 



510 



?I2 



lo 14 



16 



> 10 



Z 14 

 ~ 16 



8 



§10 



-> 12 



■^ 14 



16 



1- 

 5 8 



§ 10 



< 12 



§10 

 3 12 

 OQ 14 



05 



10 



§ 12 

 < 14 



5 10 

 § 12 



< 14 

 - 16|=. 



Figure S. Measured versus cuinpiited angles of arrival. 



