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Modifying Polyphase Codes to Mitigate Range Side-lobes in Pulse Compression Radar

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Abstract

Range side-lobes suppression which is responsible for detection ambiguity is a challenging task in pulse compression (PC) radar. Targets generating weak signals tend to hide in undesired side-lobes creating ambiguity. In general, the side-lobes behaviour performance of received signals is observed by their correlation with other contemporary signals. In this paper, a new polyphase code is proposed that exhibits good auto-correlation and cross-correlation properties to reduce peak side-lobe level (PSL) and integrated side-lobe level (ISL). The proposed polyphase code named P43code is produced by combining left and right shifted versions of \(P4\) code. The amount of rotation depends upon the overall code length. The optimum rotation combination is the one that produces maximum side-lobes reduction. The proposed design is also applied to multiple-input multiple-output (MIMO) radar, where for the proposed \(P4_{3}\) code, orthogonal waveforms are used to minimize cross-interference. Using ambiguity function (AF), the impact of proposed code on the delay-Doppler plane is investigated. Simulation results demonstrate the superiority of the proposed \(P4_{3}\) code compared to existing alternatives.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, Chandigarh College of Engineering and Technology, Chandigarh, 160019, India

    Ankur Thakur & Davinder Singh Saini

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  1. Ankur Thakur
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  2. Davinder Singh Saini
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Correspondence to Davinder Singh Saini.

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Thakur, A., Saini, D.S. Modifying Polyphase Codes to Mitigate Range Side-lobes in Pulse Compression Radar. Wireless Pers Commun 123, 693–707 (2022). https://doi.org/10.1007/s11277-021-09153-0

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