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Thinned spectrum ultrawideband waveforms using stepped-frequency polyphase codes

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1 Author(s)
Gerlach, K. ; Naval Res. Lab., Washington, DC

An ultrawideband (UWB) radar can interfere with external RF sources because of the mutual occupancy of the same frequency band. A stepped-frequency polyphase code (SFPC) waveform is proposed as a generic UWB waveform whose interference with the external RF sources is significantly reduced. The subpulses of the individual stepped-frequency (SF) pulses are phase coded using small phase perturbations. This results in a waveform which places nulls at the frequency locations of the external RF sources. Because the phase perturbations are small, a mismatched filter which uses the unperturbed pulses (no phase modulation) as a reference signal results in a simple receiver design and a small mismatch loss on receive. Furthermore, the proposed methodology also has application to narrowband or wideband radars

Published in:

Aerospace and Electronic Systems, IEEE Transactions on  (Volume:34 ,  Issue: 4 )