Ultra-wideband Pulse and Ultra-wideband Pulse-based Ranging

An ultra-wideband transmitter comprising:

• an envelope generator, and
• a carrier signal generator,
• wherein the envelope generator is configured to generate at least one ultra-wideband pulse envelope comprising a main pulse and a precursor pulse, the precursor pulse being shorter in length and lower in amplitude compared to the main pulse, and
• wherein the carrier signal generator is configured to modulate a carrier signal in amplitude such that the envelope corresponds to the at least one ultra-wideband pulse envelope and such that the carrier signal within the main pulse is phase-shifted with respect to the carrier signal within the precursor pulse.