Cosine Based Non-Linear Frequency Modulation Waveforms with Low Sidelobes

Kavitha Chandu

Abstract


Suppression of sidelobes is critical in most radar applications. The sidelobes of around -30 dB to -60dB are of primary interest in several radar applications. Several studies focused on the design of Nonlinear frequency modulated (NLFM) waveforms. Two cosine-based NLFM waveforms, NLFM I and II, are designed and investigated for their performance for sidelobe level for different time-bandwidth (BT) products. The designed waveforms achieved sidelobe levels of about -65.25 dB and -79.42 dB at BT product 1000. For low BT product 50, the sidelobes achieved are -52.71 dB and -42.05 dB, respectively. The reduction in sidelobes increased with an increase in BT product. For overall performance, the designed waveforms were investigated for doppler tolerance and signal to noise ratio (SNR). An increase in SNR caused sidelobe levels to decrease. Like other NLFM waveforms, they exhibited doppler intolerance.


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References


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