Moving Target Indicator - MIT RADAR

 The Moving Target Indicator (MTI) is the only method with which it is possible to delete the clutter (echo signal received from the static target) due to the use of a doppler.  M.T.I.  The K block is shown in the diagram. 

In the IF amplifier system used in normal radar systems, the phase and directional oscillator phase of the echo signal are compared in the phase detector. Directive oscillator to It is practiced in such a way that its phase deals with a certain type of transmitted pulse.

  Two mixers are shown in the block diagram, out of which the transmitted frequency (fo + fc) Is generated with the help of mixer-2. This is achieved with the help of transmitted frequency, stable local oscillator (stalo) and coherent oscillator (coho). When the switch of the modulator for the tube is turned on, the amplifier provides amplification for the high power pulse. The transmitted frequency drives a multi-cavity klystran amplifier that behaves like an output tube. This transmitted pulse escapes with the help of a duplexer.

              With the help of MTI radar antenna, the target pulse is retrieved. If an echo is present in the moving target, then the Doppler frequency shift experiences an echo pulse. When the receive echo pulse passes through the receiver's mixer-1, it gives the frequency: relative to the frequency of the receive signal. This converted frequency replicates the signal with the IF amplifier. This amplified signal is routed to a phase sensitive detector or phase descriptor. It compares the signal in the detector to the coherent oscillator.

Frequency generated in the coherent oscillator is similar to IF frequency called coherent frequency. The output received by the detector depends on the phase difference of the two signals. Phase detector provides output for both permanent and moving targets. The phase difference for a permanent target is variable for a permanent and a moving target.

It shows the pulse waveform of permanent and moving targets in which the pulse of permanent target is constant but the pulse of moving target is changing.

In this output, the time interval of the pulse is equal to the pulse interval or 1 / PRF. Since the delay line attenuates the signal that the amplitude is the same, if the permanent echo signal is lost, the delay line follows the amplifier. The delay and undile signal received from the amplifier are compared in the subtractor. After this, it is displayed on the screen.