Matched filtering outputs for three targets. The outputs relating to SNR = ∞ are denoted by black solid line; and the outputs relating to SNR = 20 dB are denoted by color dash line. (A) Original outputs after matched filtering. (B) Outputs weighted by Hamming window. (C) Outputs weighted by Chebyshev window. (D) Outputs filtered by SRAF with filter length 1000.