![]() ![]() MTI Radar with Power Oscillator Transmitter The output of phase detector can be connected to Delay line canceller. Phase Detector − It is used to produce the output signal having frequency $f_d$ from the applied two input signals, which are having the frequencies of $f_c f_d$ and $f_c$. This amplified signal is applied as an input to Phase detector. The IF amplifier shown in the figure amplifies the signal having frequency $f_c f_d$. IF Amplifier − IF amplifier amplifies the Intermediate Frequency (IF) signal. Here, the Mixer-II is used for producing the output, which is having the frequency $f_c\pm f_d$. The signals having frequencies $f_l f_c\pm f_d$ and $f_l$ are applied to Mixer-II. Mixer-II − Mixer can produce either sum or difference of the frequencies that are applied to it. Similarly, Antenna receives the signal having frequency of $f_l f_c\pm f_d$ when the duplexer connects the Antenna to Mixer-II. Antenna transmits the signal having frequency $f_l f_c$ when the duplexer connects the Antenna to power amplifier. Here, the Mixer-I is used for producing the output, which is having the frequency $f_l f_c$.ĭuplexer − It is a microwave switch, which connects the Antenna to either the transmitter section or the receiver section based on the requirement. The signals having frequencies of $f_l$ and $f_c$ are applied to Mixer-I. Mixer-I − Mixer can produce either sum or difference of the frequencies that are applied to it. The output of Coherent Oscillator is applied to both Mixer-I and Phase Detector. This signal is used as the reference signal. The output of Local Oscillator is applied to both Mixer-I and Mixer-II.Ĭoherent Oscillator − It produces a signal having an Intermediate Frequency, $f_c$. Hence, it is also called stable Local Oscillator. Local Oscillator − It produces a signal having stable frequency $f_l$. Power Amplifier − It amplifies the power levels of the pulse modulated signal. Pulse Modulator − It produces a pulse modulated signal and it is applied to Power Amplifier. The function of each block of MTI Radar with power amplifier transmitter is mentioned below. The block diagram of MTI Radar with power amplifier transmitter is shown in the following figure. MTI Radar uses single Antenna for both transmission and reception of signals with the help of Duplexer. MTI Radar with Power Amplifier Transmitter ![]() Now, let us discuss about these two MTI Radars one by one. MTI Radar with Power Oscillator Transmitter.MTI Radar with Power Amplifier Transmitter.We can classify the MTI Radars into the following two types based on the type of transmitter that has been used. Similarly, the frequency of the received signal will decrease if the target is moving away from the Radar. This type of Radar is called Moving Target Indicator Radar or simply, MTI Radar.Īccording to Doppler effect, the frequency of the received signal will increase if the target is moving towards the direction of Radar. Therefore, we have to choose the Radar in such a way that it considers only the echo signal due to movable target but not the clutters.įor this purpose, Radar uses the principle of Doppler Effect for distinguishing the non-stationary targets from stationary objects. The echo signals due to stationary objects (places) such as land and sea are called clutters because these are unwanted signals. However, in practical applications, Radar receives the echo signals due to stationary objects in addition to the echo signal due to that movable target. If the Radar is used for detecting the movable target, then the Radar should receive only the echo signal due to that movable target.
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