Analysis of FSK/PSK modulated radar signals using Costas arrays and complementary Welti codes

Lemieux, Jerome A.; Ingels, F.M.

doi:10.1109/radar.1990.201115

Cited by 13 publications

(11 citation statements)

References 8 publications

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“…In the accurate modulation classification part, threshold r th1 is set as 0.8 while r th2 is set as 1.2. The maximum value k max Th from a CF modulated signal is set as 10 11 Hz/s which is related to minimum chirp rate for an LFM signal. These thresholds are verified by a broad band of experiments.…”

Section: Resultsmentioning

confidence: 99%

“…The simulation adopts modulations in Table 2. The three kinds of hybrid modulations are the LFM-BFC modulation [10] in the DFC family and the LFM-BPC [8,9] and the BPC-BFC [11] modulations in the DPC family. Figure 7 gives the probabilities of successful modulation family recognition (PSMFRs) for the simulated IMOPs.…”

Section: Autonomous Classification For Modulation Familiesmentioning

confidence: 99%

“…The newly emerging radar systems, such as the cognitive radar [4], the waveform-agile radar [5], and the multiple-input multiple-output (MIMO) radar [6,7], are changing their operation modes and bringing waveforms with various kinds of complicated IMOPs. Apart from that, some waveforms with hybrid IMOPs, such as the discrete phase codes on linear frequency modulation (LFM) [8,9], multiple frequency-shift keying (FSK) waveform outperformed by a chirp modulation [10], and the combination of FSK and phase-shift keying (PSK) modulations [11], have also been reported. These complicated and hybrid IMOPs are posing a particular threat to modern EW intercept receivers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Autonomous radar pulse modulation classification using modulation components analysis

Wang

Qiu

Zhu

et al. 2016

EURASIP J. Adv. Signal Process.

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An autonomous method for recognizing radar pulse modulations based on modulation components analysis is introduced in this paper. Unlike the conventional automatic modulation classification methods which extract modulation features based on a list of known patterns, this proposed method classifies modulations by the existence of basic modulation components including continuous frequency modulations, discrete frequency codes and discrete phase codes in an autonomous way. A feasible way to realize this method is using the features of abrupt changes in the instantaneous frequency rate curve which derived by the short-term general representation of phase derivative. This method is suitable not only for the basic radar modulations but also for complicated and hybrid modulations. The theoretical result and two experiments demonstrate the effectiveness of the proposed method.

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Section: Resultsmentioning

confidence: 99%

Section: Autonomous Classification For Modulation Familiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Autonomous radar pulse modulation classification using modulation components analysis

Wang

Qiu

Zhu

et al. 2016

EURASIP J. Adv. Signal Process.

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“…In the same spirit, an overlaying of orthogonal codes in a train of Costas pulses was proposed in [9]. In [10], [11], [12], pulse modulation of Costas frequency hops was introduced, using phase codes and complementary sequences. However, few works study Costas signals beyond the orthogonality condition which requires that frequency separation ∆f should be at most equal to the inverse of pulse duration t p (i.e.…”

Section: Introductionmentioning

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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“…Phase coded versions of Costas signals are proposed in [4], [5] and [6]. However, few works study Costas signals beyond the orthogonality condition which requires that frequency separation Δf should be at most equal to the inverse of bit duration t b .…”

Section: Introductionmentioning

confidence: 99%

Doubly coded costas signals for grating lobes mitigation

Touati¹,

Tatkeu²,

Chonavel³

et al. 2013

2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

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In this paper, a novel design scheme for radar signal is proposed. It is based on a modification of Costas codes design obtained by increasing the frequency separation of frequency hops beyond the orthogonality condition. This condition states that frequency separation between frequency hops should be at most equal to the inverse of bit duration of the code. Indeed, increasing frequency separation beyond this condition is sometimes needed in radar applications. However, this leads to the appearance of grating lobes near the main temporal lobe of the autocorrelation function. This paper proposes overcoming this problem using sub-pulse coding. The originality of the proposed approach consists in choosing for Costas sub-pulses other Costas codes instead of constant frequency ones in order to lower autocorrelation grating lobes that would normally appear when the orthogonality condition is not satisfied. Indeed, we show that, under some conditions on Costas signal parameters in the sub-pulse, good elimination of grating lobes is achieved.

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Analysis of FSK/PSK modulated radar signals using Costas arrays and complementary Welti codes

Cited by 13 publications

References 8 publications

Autonomous radar pulse modulation classification using modulation components analysis

Autonomous radar pulse modulation classification using modulation components analysis

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

Doubly coded costas signals for grating lobes mitigation

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