The US FCC Regulations
First Report and Order 02-48

In the United States the Federal Communications Commission (FCC) adopted a Report and Order FCC 02-48 on February 14, 2002. In this decision, 24 GHz UWB vehicular radar systems are allowed to operate according to the emission limits shown in Figure 8.

Figure 8: FCC Report and Order (R&O) 02-48

This rulemaking mainly addressed impulse and BPSK SRR with an instantaneous occupied bandwidth of more than 500 MHz.

Second Report and Order 04-285

On December 16, 2004, the FCC released a second Report and Order FCC 04-285 that revised the rules regarding ultra-wideband transmission systems. This decision authorizes SRR devices that use a frequency carrier hopping or other modulation techniques with an instantaneous occupied bandwidth of at least 10 MHz.

The emission mask of this second R&O is shown in Figure 9.

Figure 9: FCC R&O 04-285