MTI (Moving Target Indication) radar systems have been built for many years, based on . The simple MTI delay-line canceller shown in Fig.4 is an example of a. Download scientific diagram | Block Diagram for Double Delay Line Canceller from publication: Implementation of MTI based Pulse compression Radar system . The MTI radar uses Low Pulse Repetition Frequency (PRF) to avoid range ambiguities. . Y. &. D. E. S. I. G. N. I. I. S. T. Effect of delay line canceller on the signal.
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As the name suggests, delay line introduces a certain amount of delay. So, the delay line is mainly used in Delay line canceller in order to introduce a delay of raddar repetition time.
US3373427A – Delay line canceller for radar system – Google Patents
Delay line canceller is a filter, which eliminates the DC components of echo signals received from stationary targets. This means, it allows the AC components of echo signals received from non-stationary targets, i.
Delay line cancellers can be classified into the following two types based on the number of delay lines that are present in it. The combination of a delay line and a subtractor is known as Delay line canceller.
It is also called single Delay line canceller.
The block diagram of MTI receiver with single Delay line canceller is shown in the figure below. The output of subtractor is applied as input to Full Wave Rectifier.
Therefore, the output of Full Wave Rectifier looks like as shown in the following figure. It is nothing but the frequency response of the single delay line canceller. So, the relative velocities for which the frequency response of the single delay line deay becomes zero are called blind speeds.
Find the first, second and third blind speeds of this Radar.
Radar Systems – Delay Line Cancellers
We know that a single delay line canceller consists of a delay line cancelper a subtractor. If two such delay line cancellers are cascaded together, then that combination is called Double delay line canceller.
The block diagram of Double delay line canceller is shown in the following figure. We will get the following mathematical relation from first delay line canceller.
Radar Systems Delay Line Cancellers
Inn output of the first delay line canceller is applied as an input to the second delay line canceller. We will get the following mathematical relation from the second delay line canceller.
The advantage of double delay line canceller is that it rejects the clutter broadly. The output of two delay line cancellers, which are cascaded, will be equal to the square of the output of single delay line canceller.
The frequency response characteristics of both double delay line canceller and the cascaded combination of two delay line cancellers are the same. The advantage of time domain delay line canceller is that it can be operated for all frequency ranges.