What is the principle of radar ranging?

The principle of radar ranging is to calculate the distance between the object and the radar by using the time difference between the electromagnetic wave emitted to the target object and the electromagnetic wave reflected from the target object. The radar system emits a series of electromagnetic waves. If these electromagnetic waves touch an object, they will be reflected back. The radar system receives the reflected electromagnetic wave and calculates the time from its emission to its return, so that the distance between the target object and the radar can be determined. This principle is widely used in meteorological radar, navigation radar, security radar and other fields.