This is a speed radar with customized firmware, the company that sold this didn’t provide PC based data logger software but the data can be extracted from its serial port. So I followed their manual and prepared a Data Logger Program by using C#.
They provided a tuning fork for indoor testing, knock the fork and put it near the radar will give continuous reading at about 45 km/h. This radar uses doppler effect to measure vehicle speed.
Sun Chunyang's Blog 