Depth mapping system and method therefor

A depth mapping system comprising:

• a time of flight ranging system comprising:
• an unstructured light source and a structured light source;
• an optical sensor unit;
• and
• a signal processing unit;
• wherein
• the time of flight ranging system is configured to time multiplex use of a first time of flight ranging technique and a second time of flight ranging technique in respect of the optical sensor unit, the first time of flight ranging technique is configured to measure distance ranges over a first field of view, and the second time of flight ranging technique is configured to measure distance ranges over a second field of view;
• the measurement of first distance ranges over the first field of view is at a first angular resolution and the measurement of second distance ranges over the second field of view is at a second angular resolution greater than the first angular resolution;
• the structured light source is configured to operate in respect of the first time of flight ranging technique and the unstructured light source is configured to operate in respect of the second time of flight ranging technique;
• a first region of the optical sensor unit has the first field of view associated therewith and a second region of the optical sensor unit has the second field of view associated therewith.