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Experimental −6 dB axial beamwidths, −20 dB axial beamwidths, and range sidelobe levels of three different imaging signals.
| Pulse (2 cycles) | 13-bit Barker code (2 cycles per bit) | 13-bit Barker code (3 cycles per bit) | |
|---|---|---|---|
| −6 dB axial beamwidth (mm) | 0.37 | 0.39 | 0.52 |
| −20 dB axial beamwidth (mm) | — | 0.67 | 0.91 |
| Range sidelobe level (dB) | −18 | −40 | −48 |
