NDLI: Costas-code-based radar waveform design using adaptive weights with target scattering coefficients and optimal variable time spacing with improved ambiguity function

Content Provider	IET Digital Library
Author	Deep, Ramez Eizdashire Ali Kastantin, Radwan
Abstract	Costas signals are widely used in modern radar systems as frequency coded. The Costas-code-based waveform can achieve a nearly thumbtack shape of the ambiguity function (AF). However, the highest AF's sidelobe levels (SLLs) of Costas waveform equals just 1/ N times of its main lobe level height, where N is the length of the Costas code. In this study, the authors suggest a generalised Costas waveform as a ‘burst’ of weighted pulses having variable time spacing between them, calling it as weighted variable time spacing Costas (WVTSC). They computed the AF analytical formulas of the designed WVTSC. They developed an adaptation model to adapt the WVTSC to target scattering coefficients, using the interior-point algorithm. The adaptive WVTSC yields much better Doppler cut and improved delay cut in the main lobe area of the AF, in the sense of SLL reduction. Moreover, they constructed an optimisation model resulting in optimal variable time spacing between the sub-pulses. The optimised WVTSC also yields considerable improvement in the AF's recurrent SLLs, using the genetic algorithm. The adapted optimised WVTSC design is proven, through simulation, to have better sidelobe performance than that of the initial waveform, without influencing the original delay-Doppler resolution, and without need to increase N .
Starting Page	1905
Ending Page	1917
Page Count	13
ISSN	17518784
Volume Number	14
e-ISSN	17518792
Issue Number	Issue 12, Dec (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/14/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2020.0133
Journal	IET Radar, Sonar & Navigation
Publisher Date	2020-08-24
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Adapted Optimised WVTSC Design Adaptive Weights Code Costas Signal Costas-code-based Radar Waveform Design Costas-code-based Waveform Doppler Cut Doppler Radar Electromagnetic Wave Propagation Electromagnetic Wave Scattering Generalised Costas Waveform Improved Ambiguity Function Main Lobe Area Main Lobe Level Height Modern Radar System Optimal Variable Time Spacing Radar Equipment Radar Signal Processing Radar Theory Sidelobe Levels Signal Processing And Detection System And Application Target Scattering Coefficient Weighted Variable Time Spacing Costas
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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