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Accurate direction of arrival (DOA) estimation of wideband, low-power nonstationary signals is important in many radio frequency (RF) applications. This article analyses the performance of two incoherent aggregation techniques for the DOA estimation of high chirp-rate linear frequency modulated (LFM) signals used in modern radar and electronic warfare (EW) applications. The aim is to determine suitable aggregation techniques for blind DOA estimation for real-time implementation with a frequency channelised signal. The first technique calculates a single pseudospectrum by directly combining the spatial covariance matrices from each of the frequency bins. The second technique first calculates the spatial pseudospectra from the spatial covariance matrix (SCM) from each frequency bin and then combines the spatial pseudospectra into one single estimate. Firstly, for single and multiple signal emitters, we compare the DOA estimation performance of incoherent SCM-based aggregation with that of the incoherent spatial pseudospectra-based aggregation using the root mean-squared error (RMSE). Secondly, we determine the types of signals and conditions for which these incoherent aggregation techniques are more suited. We demonstrate that the low-complexity SCM-based aggregation technique can achieve relatively good estimation performance compared to the pseudospectra-based aggregation technique for multiple narrowband signal detection. However, pseudospectra aggregation is better suited for single wideband emitter detection. Both the incoherent aggregation techniques presented in this article offer a computational advantage over the coherent processing techniques and hence are better suited for real-time implementation.
Ronald Mulinde; Mayank Kaushik; Manik Attygalle; Syed Aziz. Low-Complexity Aggregation Techniques for DOA Estimation over Wide-RF Bandwidths. Electronics 2021, 10, 1707 .
AMA StyleRonald Mulinde, Mayank Kaushik, Manik Attygalle, Syed Aziz. Low-Complexity Aggregation Techniques for DOA Estimation over Wide-RF Bandwidths. Electronics. 2021; 10 (14):1707.
Chicago/Turabian StyleRonald Mulinde; Mayank Kaushik; Manik Attygalle; Syed Aziz. 2021. "Low-Complexity Aggregation Techniques for DOA Estimation over Wide-RF Bandwidths." Electronics 10, no. 14: 1707.
Note: In lieu of an abstract, this is an excerpt from the first page. This paper
Jakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Alex Dinovitser; Mayank Kaushik; Brian W.-H. Ng; Derek Abbott. Addendum: Sultana, J., et al. Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding. Fibers 2020, 8, 14. Fibers 2021, 9, 20 .
AMA StyleJakeya Sultana, Saiful Islam, Cristiano M. B. Cordeiro, Alex Dinovitser, Mayank Kaushik, Brian W.-H. Ng, Derek Abbott. Addendum: Sultana, J., et al. Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding. Fibers 2020, 8, 14. Fibers. 2021; 9 (3):20.
Chicago/Turabian StyleJakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Alex Dinovitser; Mayank Kaushik; Brian W.-H. Ng; Derek Abbott. 2021. "Addendum: Sultana, J., et al. Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding. Fibers 2020, 8, 14." Fibers 9, no. 3: 20.
A hollow core antiresonant photonic crystal fiber (HC-ARPCF) with metal inclusions is numerically analyzed for transmission of terahertz (THz) waves. The propagation of fundamental and higher order modes are investigated and the results are compared with conventional dielectric antiresonant (AR) fiber designs. Simulation results show that broadband terahertz radiation can be guided with six times lower loss in such hollow core fibers with metallic inclusions, compared to tube lattice fiber, covering a single mode bandwidth (BW) of 700 GHz.
Jakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Alex Dinovitser; Mayank Kaushik; Brian W.-H. Ng; Derek Abbott. Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding. Fibers 2020, 8, 14 .
AMA StyleJakeya Sultana, Saiful Islam, Cristiano M. B. Cordeiro, Alex Dinovitser, Mayank Kaushik, Brian W.-H. Ng, Derek Abbott. Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding. Fibers. 2020; 8 (2):14.
Chicago/Turabian StyleJakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Alex Dinovitser; Mayank Kaushik; Brian W.-H. Ng; Derek Abbott. 2020. "Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding." Fibers 8, no. 2: 14.