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In this step, a generalized matched filter is used to isolate a set of preliminary spikes from the noise.

At D, a received pulse waveform matched filter is employed.

The output of the matched filter is, compare with (6) and (7), (8).

The matched filter is optimal if structure of PU waveform is known.

In these conditions, the ranging performance of the correlator or matched filter is relatively poor [8].

A comparative analysis between the PBCCS and of the matched filter is shown in Fig. 13.

The ambiguity function and matched filter are employed for the active signal analysis and processing.

Two adaptive detectors, i.e., generalized likelihood ratio and adaptive matched filter, are then adopted, and their expressions for the probabilities of false alarm and detection are provided.

The original matched filter was proposed by D. O. North[14].

Hence, a simple matched filter was proposed to match the direction of the vessels at the optic disc vicinity.

The Gaussian matched filter was resized in four different sizes, and the difference between the output of the matched filter and the vessels' directions was measured.