A novel approach for embedding communication symbols into physical radar waveforms

Şahin, Cenk; Jakabosky, John; McCormick, Patrick M.; Metcalf, Justin G.; Blunt, Shannon D.

doi:10.1109/radar.2017.7944444

Cited by 128 publications

(63 citation statements)

References 26 publications

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“…Despite recent efforts to remediate it, the RSM effect has not previously been mathematically characterized. Here we initiate a mathematical treatment of RSM for REC systems where phase-modulated radar and communication waveforms are combined via [7] to form phase-modulated composite emissions. The motivation for focusing on phase-modulated emissions is the polyphase-coded FM (PCFM)-based [24] REC formulation introduced in [7].…”

Section: Introductionmentioning

confidence: 99%

“…Here we initiate a mathematical treatment of RSM for REC systems where phase-modulated radar and communication waveforms are combined via [7] to form phase-modulated composite emissions. The motivation for focusing on phase-modulated emissions is the polyphase-coded FM (PCFM)-based [24] REC formulation introduced in [7]. With this approach, communication symbols are embedded into radar emissions under constant envelope constraints in a continuous phase modulation (CPM) [25] framework.…”

Section: Introductionmentioning

confidence: 99%

“…This arrangement produces joint radar/communication emissions that are constant amplitude and well-contained spectrally, thus ensuring they are amenable to high-power transmitters [24]. In addition, the approach in [7] allows for control of the degree of RSM by adjusting the modulation index to trade-off communication performance (namely, data throughput and bit error rate (BER)) for radar performance (clutter cancellation).…”

Section: Introductionmentioning

confidence: 99%

“…Because the CPM structure contains memory [25], the RSM effect is examined here within a phase-shift keying (PSK) [26] REC framework [8] using random biphase radar codes. This PSK structure is a special case of the more general PCFM-CPM radar/communication framework proposed in [7] and is used here, along with the assumption of a randomly coded radar waveform for each CPI, to facilitate a mathematically tractable analysis of the RSM. The results of this analysis subsequently provide greater understanding of RSM behavior for the more general (and physically realizable) PCFM-CPM structure.…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, it II. SYSTEM MODEL With the REC system under consideration, the emitted signal is the product of a radar waveform and a communication waveform [7], [8]. The base radar waveform is a polyphasecoded waveform that is constant during the CPI while the communication waveform is a phase-modulated communication sequence that varies from pulse to pulse.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Range Sidelobe Modulation Arising from Radar-Embedded Communications

Şahin

Metcalf

Blunt

2017

International Conference on Radar Systems (Radar 2017)

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When information sequences are embedded into radar waveforms by means of coding diversity, the resulting radar emissions then change on a pulse-to-pulse basis during a coherent processing interval (CPI). As such, pulse compression of these different waveforms leads to different sidelobe structures, giving rise to range sidelobe modulation (RSM) of the clutter. The presence of RSM induces a partial loss of coherency after Doppler processing, resulting in residual clutter after cancellation, and hence reduced target visibility.Here the RSM effect is mathematically characterized within a phase-modulated radar-embedded communication framework. A closed-form expression for the expected value of the residual clutter power, referred to as the RSM power, is derived. The RSM power is found to not be dependent on the Doppler frequency or time-bandwidth product, but is a decreasing function of the number of pulses in the CPI and an increasing function of the modulation index. The latter controls the amount of phase shift within the radar pulse due to each communication symbol.

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Section: Introductionmentioning

confidence: 99%