Wavelet Transform Radar Signal Processing
Historically, Fourier Transform, FT is used for radar signal processing.
With the introduction of Fast Fourier Transform, FFT and advancement of DSP in ASIC, radar technology has significantly grown.
It is well known that there is fundamental limitation to time and frequency resolution which is govern by Ambiguity function.
Wavelet Transform, WT has however better time and frequency resolution.
WT relies on octave frequencies, i.e., even harmonics and ignore odd harmonics completely.
Octave based echolocation is used by bat.
Octave based signals are fundamental to music and harmonious.
Whereas, odd harmonics are not desired at least in human audio signals.
Orca echolocation sonar utilizes symmetric waveform, which have even and odd harmonics.
Orca sounds are not harmonious and could be frightening.
Chirped or phase coded radar waveform only contains even harmonic, in other words octave-based signals content.
Therefore, for these types of waveform, WT could be utilized for DSP by radar processor.
There appear some advantages by utilizing WT when asymmetric waveform are processed.
First, odd harmonics is not processed and it could save processing time.
Second, odd harmonic distortions caused by the radar system impairments mechanism cannot be confused as a real radar target.
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