Sudoku based phase-coded radar waveforms

Munson, Nicholas R.; Bufler, Travis Dale; Narayanan, Ram M.

doi:10.1117/12.2588316

Cited by 2 publications

(1 citation statement)

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“…Fig. (1(b)) illustrates a reasonable approximation called the thumbtack ambiguity function, which has a narrow main lobe and non-zero side lobes [8]. The general formulation of the ambiguity function does not include a scattering coefficient for the target in the received signal model.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the OFDM Radar Waveform for Low-Angle Target Tracking Using WAF Criteria

Asadsangabi,

Mohseni,

Samadi

2024

Preprint

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A novel algorithm is proposed to enhance the wideband ambiguity function (WAF) of radar by designing an orthogonal frequency division multiplexing (OFDM) waveform. This design improves signal resolution, leading to more accurate tracking of low-angle targets. The goal is to optimize the volume of the OFDM signal's WAF to approximate the desired ambiguity function volume in the delay-Doppler plane. This optimized waveform improves the delay (range) resolution of the radar system by enhancing the auto-correlation function (ACF). Additionally, using a multicarrier OFDM signal improves delay resolution by the number of subcarriers. The phase and amplitude coding technique further improves delay and Doppler. It is important to note that the waveform design considers various factors that affect low-angle target tracking, such as atmospheric attenuation, surface reflection, diffraction, and refraction. Theoretical expressions for each area, along with tabular and graphical results applicable to common radar frequencies and radar-target paths, are provided. When modeling specular multipath signals, the effects of the earth's curvature and the linear refractivity gradient of the horizontally stratified atmosphere are also taken into account. The methodology used is the LSE method utilized in designing the waveform. The main results obtained demonstrate enhancements not only in the Doppler and delay ambiguity function, but also in angle measurement and RMSE. Finally, our work demonstrates improved performance when compared with the articles.

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Section: Introductionmentioning

confidence: 99%

Optimizing the OFDM Radar Waveform for Low-Angle Target Tracking Using WAF Criteria

Asadsangabi,

Mohseni,

Samadi

2024

Preprint

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A Novel Evolutionary Algorithm With Column and Sub-Block Local Search for Sudoku Puzzles

Wang

Sun

et al. 2024

IEEE Trans. Games

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Sudoku puzzles are not only popular intellectual games but also NP-hard combinatorial problems related to various real-world applications, which have attracted much attention worldwide. Although many efficient tools, such as evolutionary computation (EC) algorithms, have been proposed for solving Sudoku puzzles, they still face great challenges with regard to hard and large instances of Sudoku puzzles. Therefore, to efficiently solve Sudoku puzzles, this paper proposes a genetic algorithm (GA)-based method with a novel local search technology called local search-based GA (LSGA). The LSGA includes three novel design aspects. First, it adopts a matrix coding scheme to represent individuals and designs the corresponding crossover and mutation operations. Second, a novel local search strategy based on column search and sub-block search is proposed to increase the convergence speed of the GA. Third, an elite population learning mechanism is proposed to let the population evolve by learning the historical optimal solution. Based on the above technologies, LSGA can greatly improve the search ability for solving complex Sudoku puzzles. LSGA is compared with some state-of-the-art algorithms at Sudoku puzzles of different difficulty levels and the results show that LSGA performs well in terms of both convergence speed and success rates on the tested Sudoku puzzle instances.

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Sudoku based phase-coded radar waveforms

Cited by 2 publications

References 0 publications

Optimizing the OFDM Radar Waveform for Low-Angle Target Tracking Using WAF Criteria

Optimizing the OFDM Radar Waveform for Low-Angle Target Tracking Using WAF Criteria

A Novel Evolutionary Algorithm With Column and Sub-Block Local Search for Sudoku Puzzles

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