Table 1.

Simulated and measured decrease in grating lobe levels in dB (with respect to mainlobe levels) for sinusoidal, conventional chirp and modified chirp excitations.

	Simulations		Measurements
	Focusing	steering	focusing	steering
Sinusoidal	−2.7	−0.1	−5	0
chirp	−6.6	−4.4	−9	−5.8
Modulated chirp	−7.8	−5.5	−10.1	−7.4