Practical Consideration Factors to Design Array Configuration of Direction Finding System for Airborne Signal Intelligence

Table 1

Sample antenna array spacings for three element array.

Array spacing type	Array spacing
	Ref [22]	Ref [20]	Ref [18]
Harmonic	0.5, 1.0	0.5, 1.0	0.5, 1.0
Nonharmonic	-	0.5, 1.5	0.5, 1.5
	-	1.0, 1.5	-
	-	0.5, 2.5	0.5, 2.5
	-	2.0, 2.5	-

Midphase.