Filtering Chirp Waveforms without Producing unwanted Sidelobes

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Addis Ababa University


Regardless of the type of waveforms implemented by a radar, using a matched filter at the receiver yields the maximum signal to noise ratio (SNR). Unfortunately, when one applies matched filtering technique in filtering chirp waveforms, it produces unwanted sidelobes at the output of the receiver. In this case it is difficult to pinpoint whether the radar signal is coming from the main peaks or from the sidelobes. This can be a major problem especially when main scatterer lies at the sidelobes. In other words, there will be ambiguity in the measurements. Here we present a new method of filtering chirp waveforms that suppresses the unwanted sidelobes. The method is developed based on an earlier work that has been applied to solve a similar problem created in filtering binary phase coded waveforms by means of matched filter [2]. Abiyu Zerfu: June, 2005, Addis Ababa



Filtering Chirp Waveforms