Coherent MTI Radar vs Non-Coherent MTI Radar | Difference between Coherent MTI Radar and Non-Coherent MTI Radar
This page compares Coherent MTI Radar vs Non-Coherent MTI Radar and mentions difference between Coherent MTI Radar and Non-Coherent MTI Radar.
Coherent MTI Radar
The figure-1 depicts block diagram of Coherent MTI radar. Here each cycle of magnetron oscillations starts with phase which is not related to the previous pulsed cycle.
The coherent MTI radar requires a high pulse repetition frequency to make sure that pulses from each target are returned.
Here RF oscillator is used to act as phase reference to find the phase of reflected signal. Pulse amplifier is used to generate the pulses. The detected phase data is stored in delay line for interval between transmitted pulses. This is substracted from data of previous pulse. The output of substractor exists if there is moving target. The output is zero for stationary target. Phase fluctuation due to moving target is considered in coherent MTI radar.
Non-Coherent MTI Radar
The figure-2 depicts block diagram of Non-Coherent MTI radar. In this radar, required variations are obtained by comparing required echoes from stationary and radially moving targets.
The echoes from moving target involves both amplitude and phase changes. In non-coherent MTI radar, change in amplitude is considered. As shown, modulated output from magnetron is transmitted. The received echo signal and local oscillator difference is fed to the mixer. The output of mixer is fed to IF amplifier. The output of IF amplifier is passed to amplitude detector and detector output is given to delay line canceller.