Distance measurement method and distance measurement system

A ranging system comprising:

• a laser emitting device including a first laser emitting portion configured to emit a vertical laser beam rotating in a vertical plane at a first rotation speed;
• a laser receiving device including a first optical detection component and a second optical detection component at least partially on the same vertical plane, wherein the laser receiving device is configured to calculate a time difference between the vertical laser beam passing through the first optical detection component and the second optical detection component, and the distance between the two optical detection components is a first spacing;
• and
• a determining device configured to calculate a first distance between the laser emitting device and the laser receiving device based on the first rotation speed, the first spacing, and the time difference.

A ranging system including a laser receiving device, the laser receiving device including:

• a first optical detection component for receiving a laser light emitted by a laser emitting portion of a laser emitting device;
• and
• a second optical detection component for receiving the laser light emitted by the laser emitting portion of the laser emitting device,
• wherein the second optical detection component is disposed substantially perpendicular to the first optical detection component.