Anti-interference speed detection methods and detectors thereof

A speed detection method, implemented in a speed detector comprising a range finder, comprising:

• acquiring a specific number of distance measurement samples of an object during a period of time utilizing the range finder;
• converting the distance measurement samples based on velocities of M assumed observers to generate M versions of the distance measurement samples respectively corresponding to the velocities of M assume observers, wherein M is a positive integer, each version of the distance measurement samples comprises reflected distance measurement laser pulses, and each reflected pulse corresponds to a measured distance and a received pulse order;
• determining a version of the distance measurement samples comprising a distance range to which the highest number of reflected pulses corresponds;
• and
• calculating a speed of the object based on an assumed velocity to which the determined version corresponds.