Table 1 Basic parameters of the sensors

System clock frequency

4.5 GHz

13 GHz

Operational bandwidth

DC-2.25 GHz

0.2–6.5 GHz

M-sequence generator

linear, 9-stage

linear, 12-stage

Period of M-sequence

511 chips

4095 chips

Impulse responses

511 samples/114 ns

4095 samples / 315 ns

Maximum range

17 m

47 m

Range resolution

3.33 cm

1.15 cm

Output power

1 mW

10 mW

Antennas

1 Tx, 2 Rx;

1 Tx, 2 Rx;

Horn antennas

Double-ridged

broadband antennas