Ranging system and mobile platform

A ranging system comprising at least two types of:

• a first-type ranging apparatus;
• a second-type ranging apparatus, each of the first-type ranging apparatus and the second-type ranging apparatus including:
• a ranging device including:
• a light source configured to emit a light pulse sequence;
• a convergent lens configured to converge a portion of a light pulse reflected by an object to a receiver;
• the receiver configured to determine a distance of an object according to the portion of the light pulse;
• and
• a scanner configured to change an emission direction of the light pulse sequence emitted by the light source to scan in a field of view (FOV) and including:
• two rotation light refraction elements, each of the two rotation light refraction elements including a light emission surface and a light incident surface that are opposite and not parallel to each other;
• and
• a third-type ranging apparatus including:
• a ranging device including:
• a light source configured to emit a light pulse sequence;
• and
• a scanner configured to change an emission direction of the light pulse sequence emitted by the light source to scan in a FOV and including:
• three rotation light refraction elements, each of the three rotation light refraction elements including a light emission surface and a light incident surface that are opposite and parallel to each other;
• wherein:
• a FOV of the second-type ranging apparatus is smaller than a FOV of the first-type ranging apparatus;
• and
• a diameter and a focal length of a convergent lens of the second-type ranging apparatus are greater than a diameter and a focal length of a convergent lens of the first-type ranging apparatus, respectively.