digital radar speedometer

Discussion in 'The Projects Forum' started by mona, Aug 24, 2008.

  1. mona

    Thread Starter New Member

    Aug 24, 2008
    hey. can any one tell me about the feasability of this is said that circuit works on principle of radar reflexion. can anyone tell me what is that?
  2. roddefig

    Active Member

    Apr 29, 2008
    Certain materials reflect radio waves. If we transmit a pulse and time the amount of time it takes to receive an echo, we can calculate the distance. Radar guns (speedometers), however, generally use a constant wave and measure the frequency shift. The amount of frequency shift is proportional to the speed of the object.

    Here is a radar gun that uses a PIC:
    Here is a radar altimeter: