A dual-function radar-communication system using FDA

Ji, Shilong; Chen, Hui; Hu, Quan; Pan, Ye; Shao, Huaizong

doi:10.1109/radar.2018.8378561

Cited by 17 publications

(13 citation statements)

References 33 publications

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“…In case the range is known and the angle is unknown, the corresponding CRLB is equivalent to the inverse of Fisher information matrix (FIM) and has been given in [29] as where Γ −1 is the inverse FIM. In [22], the radar emission contains information bits which limit the CRLB for an angle to some extent and keeps the FDA RadCom fluctuating between FDA and phased array systems, because whenΔ f is multiplied with binary information “one” it gives FDA system and when multiplied with binary information “zero” it gives phased array system, so this approach keeps the system performance in between both conventional systems. Therefore, they bound the CRLB for an angle to a certain value only such as …”

Section: Simultaneous Signal Receptionmentioning

confidence: 99%

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Dual-function radar–communications: information transmission during FDA radar listening mode

Al-Salehi

Qureshi

Malik

et al. 2019

Int. J. Microw. Wireless Technol.

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We investigate the frequency diverse array (FDA) for joint radar and communication systems. The basic idea is to use the transmitter/receiver modules of the radar system for communication purpose during listening mode as a secondary function. The radar will be performing its routine functions during the active mode as a primary function. An FDA at the transmitter side will be used to produce an orthogonal frequency division multiplexed signal, which is proposed for the communication system. The directivity of the radar antenna, FDA in this case, provides an additional advantage to mitigate the interferences other than the Direction of Interest (DoI). The proposed technique allows two beampatterns to be transmitted sequentially from the same FDA structure. Due to the communication signal transmission in the mainlobe of the second beampattern, the bit error rate achieved in the mainlobe is better than the existing techniques using the sidelobe transmission for communications. At the receiver, both incoming signals of radar and communication will share a different spatial angle. Simulation results indicate the novelty of the idea to suppress the interferences in terms of DoI. Furthermore, we analyzed the signal-to-interference ratio and Cramer–Rao lower bounds for angle and range estimation for the proposed technique.

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Section: Simultaneous Signal Receptionmentioning

confidence: 99%

“…In [21], Costas signal waveforms are used to embed information into FDA-multiple-input multiple-output MIMO radar. In [22], the incremental frequency of FDA has been embedded with information during radar emission.…”

Section: Introductionmentioning

confidence: 99%

Dual-function radar–communications: information transmission during FDA radar listening mode

Al-Salehi

Qureshi

Malik

et al. 2019

Int. J. Microw. Wireless Technol.

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show abstract

“…By minimising the Cramér-Rao lower bounds (CRLB), an optimal sub-array design strategy was considered for FDA radar target localisation in [18]. Owing to the additional degrees-of-freedom in range domain, FDA possesses potential advantages over traditional PA in joint angle and range localisation [11], range-ambiguous clutter and interferences suppression [19], multipath mitigation [20], transmit beamspace [21], high-resolution imaging [22], and dual-function radarcommunication [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Space‐time matched filter design for interference suppression in coherent frequency diverse array

Wang

Liao

et al. 2020

IET signal process.

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By transmitting a single frequency-shifted waveform, coherent frequency diverse array (FDA) can provide a simple way to realize full spatial coverages with stable gains. Owing to the range-angle dependency in coherent FDA, the authors implement a two-dimensional angle-time matched filter to perform equivalent transmit beamforming and matched filtering simultaneously. However, such filter structures merely control main-lobes of equivalent transmit beams towards target directions. It fails to form nulls at interference directions. Moreover, traditional adaptive beamforming by designing adaptive weight vectors are no longer applicable. Additionally, they find that the range resolution scales linearly with the element number. To tackle these issues, a space-time matched filter (STMF) in combination with the hybrid coding technique is proposed. Aiming at mitigating interferences, the STMF is designed with a formulation of quadratically constrained quadratic programing. By relaxation of quadratic constraints, the hard non-convex problem can be turned into the second-order cone programing to obtain optimal filter parameters. Furthermore, the hybrid coding technique is devised to jointly improve the range resolution. Numerical experiments of both two-dimensional range-angle outputs and one-dimensional range profiles via filtering are provided, which demonstrate that the STMF with hybrid coding can effectively suppress sidelobe interferences with a range resolution enhancement.

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“…By exploiting the advantage of FDA, practical applications of tremendous potential have been explored, such as joint angle and range localisation [20][21][22], deceptive interference mitigation [23], range-ambiguous clutter suppression [24][25][26][27], dual-function radar communication [28][29][30] and high-resolution imaging [31,32]. In [33], a bistatic FDA radar was introduced in application of the lowprobability-of-intercept radar to limit returns from undesirable range cells.…”

Section: Introductionmentioning

confidence: 99%

Subarray‐based coherent pulsed‐LFM frequency diverse array for range resolution enhancement

Wang

Liao

et al. 2020

IET signal process.

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Coherent frequency diverse array (FDA) can provide the full spatial illumination with a stable transmit gain by employing a single frequency-shifted waveform. However, the authors find that the range resolution is scaled linearly with the number of elements. In this work, the problem is first quantitatively analysed through mathematical derivation. To solve the issue, a subarray-based coherent FDA transmitting pulsed linear frequency modulation signals is proposed. The essence of the subaperture technique is to partition the transmit antenna array into multiple regular or irregular subarrays, wherein an identical carrier frequency is utilised in each subarray. Meanwhile, distinct carrier frequencies are adopted between subarrays. Moreover, the multi-dimensional ambiguity function is studied to assess the properties including the range resolution, spatial coverage and sidelobe level. Simulation results demonstrate that the proposed approach has superiorities in range resolution enhancement and range sidelobe reduction.

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A dual-function radar-communication system using FDA

Cited by 17 publications

References 33 publications

Dual-function radar–communications: information transmission during FDA radar listening mode

Dual-function radar–communications: information transmission during FDA radar listening mode

Space‐time matched filter design for interference suppression in coherent frequency diverse array

Subarray‐based coherent pulsed‐LFM frequency diverse array for range resolution enhancement

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