Phase Coded Costas Signals for Ambiguity Function Improvement and Grating Lobes Suppression

Nadjah, Touati; Tatkeu, Charles; Chonavel, Thierry; Rivenq, Atika

doi:10.1109/vtcfall.2013.6692362

Cited by 18 publications

(7 citation statements)

References 12 publications

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“…While frequency coding has been used to minimize or control the side-lobe level of an ambiguity function [25][26][27], we use it to obtain and distinguish multiple distance estimates within the maximum delay of the target reflected wave. The parameters related to FCCW generation in Fig.…”

Section: Frequency Coded Continuous Wave (Fccw)mentioning

confidence: 99%

Distance Estimation of High-Speed Underwater Targets Based on a Frequency-Coded Continuous Wave

Park

Kim

2020

IEEE Access

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Section: Frequency Coded Continuous Wave (Fccw)mentioning

confidence: 99%

Distance Estimation of High-Speed Underwater Targets Based on a Frequency-Coded Continuous Wave

Park

Kim

2020

IEEE Access

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“…In [15], we have shown that coding pulses, with codes that have good autocorrelation properties, significantly lowers the grating lobes level. The complex envelope of pulse waveforms will be:…”

Section: Costas Signals With Phase Coded Pulsesmentioning

confidence: 99%

“…In [15], we have shown that coding pulses, with codes that have good autocorrelation properties, significantly lowers the grating lobes level. The complex envelope of pulse waveforms will be:

A false(t false) = \sum_{l = 0}^{L - 1} q_{l} Rect false(false(t - l t_{normalc} false) / t_{normalc} false)

where t c = t p / L and [ q l ] l =0: L −1 are the code sequences.…”

Section: Proposed Designsmentioning

confidence: 99%

Design and performances evaluation of new Costas‐based radar waveforms with pulse coding diversity

Touati

Tatkeu

Chonavel³

et al. 2016

IET Radar, Sonar & Navigation

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Costas codes are a variant of pulse compression waveforms, largely studied for their attractive time-frequency properties. Their 'thumbtack-like' ambiguity function (AF) makes them highly suitable for delay and Doppler estimation, in radar and sonar applications. However, this behaviour depends heavily on the length of the code: the improvement in delay-Doppler resolutions and AF sidelobes level needs an increase in the size of the code. In this study, designs that allow good performance without increasing the size of the code are proposed. They are based on a modification of Costas codes by widening frequency separation between hops and replacing rectangular pulses by other waveforms. This will lead to a removal of autocorrelation function grating lobes that normally appear when frequency separation is increased. The originality of the work lies in the proposal of diversified pulse waveforms, such as phase codes, Slepian sequences, and other Costas codes, to encode main Costas pulses. A performance comparison of the proposed approaches is supplied. Such waveforms could also be of interest for applications where waveform diversity is desired

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“…Therefore, cannot be used to improve the SNR for Moving targets. Touati, et al (8) proposed a technique to improve autocorrelation properties with lower grating lobes for a fixed bandwidth time product. However, in most of the phase codes, the level of the autocorrelation of side lobes decreases when their length is increased.…”

Section: Introductionmentioning

confidence: 99%

Design Of Digital Code Using Trellis Code to Improve Multiple Moving Target Detection in Doppler Radar

Bhure¹,

Manjunathachari²

2021

IJST

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Objective: Model the digital codes to enhance the detection of desired target in Multi-object environment. Methods: This study presents an effective mathematical model using convolution code, Trellis Code, and Quadratic Residue Technique to increases the probability of moving target detection. Findings: The proposed digital codes are efficient in detecting and tracking battle-field targets, slow-moving targets (helicopters, fighter aircraft), and fast moving ICBM (Inter-Continental Ballistic Missile). Application: The proposed approach can be used in surveillance, defense, and monitoring the weather forecast. It also provides an opportunity for researchers to improve the methodology for fast-moving targets at desired Doppler frequency. Novelty: This approach improves the merit factor (MF) of the main lobe and also reduces the amplitude of the side spikes below the threshold limit by creating multiple clear windows at various Doppler ranges. To authenticate the proposed model, a comparison between the proposed model and the existing model is presented. The work has been validated using Mat-Lab.

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Phase Coded Costas Signals for Ambiguity Function Improvement and Grating Lobes Suppression

Cited by 18 publications

References 12 publications

Distance Estimation of High-Speed Underwater Targets Based on a Frequency-Coded Continuous Wave

Distance Estimation of High-Speed Underwater Targets Based on a Frequency-Coded Continuous Wave

Design and performances evaluation of new Costas‐based radar waveforms with pulse coding diversity

Design Of Digital Code Using Trellis Code to Improve Multiple Moving Target Detection in Doppler Radar

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