A new radar waveform design algorithm with improved feasibility for spectral coexistence

Abstract

Radar signal design in a spectrally crowded environment is currently a challenge due to the increasing requests for spectrum from both military sensing applications and civilian wireless services. The goal of this paper is to improve a previously devised algorithm for the synthesis of optimized radar waveforms fulfilling spectral compatibility with overlaid licensed radiators. The new technique achieves an enhanced spectral coexistence with the surrounding electromagnetic environment through a suitable modulation of the transmitted waveform energy, which was kept fixed at the maximum level in the previously devised algorithm. At the analysis stage, the waveform performance is studied in terms of trade-off among the achievable Signal to Interference Plus Noise Ratio (SINR), spectral shape, and the resulting Autocorrelation Function (ACF), also in situations where the previous technique cannot be applied.

Gapped spectrum shaping for tandem-hopped radar/communications & cognitive sensing

“…The reason is that that increase in range sidelobes that usually accompanies the inclusion of spectral gaps is to some degree offset by the fact that the sidelobes do not coherently combine within the changing signal structure. A fundamental difference between this approach and existing gapped spectrum approaches [7][8][9][10][11][12][13][14], is that this waveform does not repeat. In this paper the spectrally gapped PRO-FMCW waveform is examined with regards to shaping of the gaps to further reduce range sidelobes and this approach is experimentally measured to evaluate feasible gap depth in the presence of transmitter distortion.…”

Computationally efficient beampattern synthesis for dual-function radar-communications

“…Waveforms with low cross-correlations properties cab ne designed using several recently developed methods see [32]- [37]. The number of bits that can be simultaneously embedded during each pulse becomes Q times the number of orthogonal waveforms used.…”

Efficient sidelobe ASK based dual-function radar-communications

“…Alternatively, waveforms with low cross-correlations can be used in practice. The design of waveforms with low cross-correlations properties has been extensively investigated in the literature (see [35]- [37], and references therein).…”

“…Some of these schemes require the realization of multiple orthogonal waveforms. The problem of waveform design with good auto-and cross-correlation properties has been investigated thoroughly in multiple-input multiple-output radar [25]- [32], cognitive radar [33], and spectral coexistence [34]- [37].…”