mT;
point any time a 150-degree phase difference is produced as a result of difference in arriwal time of the BF signal at the rwo antennas.
4 mathematical re-
lationship can be derived which relates the angle between the line of sight to
the transaitter and the antema base line to the wavelength of the received
fTequency as follows:
Oo = cos “(kK ~ V/2n ,
DA
where a = angle between line of sighr to the transmitter and the antenna base
line when a mull occurs, K = an interger, \ = wavelength of received frequency,
aod D = mmober of vawelengths in the antenna base lice.
An accuracy of 2 mils
in an angle in trajectory determination can ooraally be expected.
Wirth the
sbort base lines used at Jchnstcn Island, the theoretical accuracy is somevbat
less than 2 mils in angle.
Extremely accurate placement of two receiving sta-
tions, each with orthogonal base lines, is a minimm requirement.
A common
Cim base, 1000 cps, is recorded on the Milier oscillograph similtaneously vith
the data.
7-2
EVALCATION OF SYSTEM PERFORMANCE
Six Deacoo-Arrow wissiles and two Viper-Arrow missiles were fired on Teak.
The Deacon-Arrow missiles were placed at 96,000 feet at burst time (see Figs.
8.5 through 8.8, Chaprer 8) along warious azimuths.
It was anticipated thar
these would bracket the fringe areas of ionization.
The Viper-Arrows were dis-
patched along a 185-degree azimuth with the intention of allowirg the transmitters to be wiewed through the center of the fireball.
low-frequency transmitters were used.
Four high- and four
Both Viper-Arrows suffered first-stage
instabilities and fell to Jobnsteo Island priscr to burst time.
Some data were
recorded on fiwe of the six transmitters functioning at burst time.
As a re-
sult of jacming of the Miller recorder in the Johnston Island receiving station,
po data were recorded from the sixth transaitter.
flew in accordance with a predetermined trajectory.
The Deacon-Arrow aissiles
MIDOT trajectory data were
obtained on the 22kh-mc transmitter.
,
Eight Deacon-Arrow aissiles were in place for laumch on Orange.
Four
were launched at a 7O-degree angle and were to have been approximately at
apogee at burst time to permit viewing through the fireball.
Two more were to
ay
aA