Over-the-horizon radar sensitivity enhancement by impulsive noise excision

Barnum, J.; Simpson, Erik E.

doi:10.1109/nrc.1997.588315

Cited by 36 publications

(44 citation statements)

References 2 publications

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“…Let . The waveform is sampled at time intervals , giving the discrete signal as (6) which is the product of two complex sinusoids in pulse index and sample index , combined with the additive noise . The phase changes over within one pulse provide slant range information while the phase changes over from pulse to pulse give Doppler information.…”

Section: Signal Modelmentioning

confidence: 99%

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Simultaneous operation of two over-the-horizon radars

2004

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Abstract-By exploiting the reflective and refractive nature of high-frequency (HF) radiowave propagation through the ionosphere or the conducting sea surface, over-the-horizon radar (OTHR) systems perform wide-area surveillance at long range well beyond the limit of the horizon of conventional line-of-sight (LOS) radars. Improved characterizations of the targets can be achieved by using multiple OTHRs operating simultaneously as compared to a single OTHR operating alone. In this paper, we consider concurrent operations of two OTHR systems that occupy the same frequency band with different chirp waveforms. The objective is to respond to the advanced wide-area surveillance needs without reducing the wave repetitive frequency. For this purpose, a new cross-radar interference cancellation technique is developed and its effectiveness is verified through both analytical and simulation results.

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Section: Signal Modelmentioning

confidence: 99%

“…Various signal processing methods have been considered for the suppression of impulsive and transient interference signals for enhanced OTHR performance (see for example [6]- [10]). However, to our knowledge, signal detection and cross-radar interference mitigation in a dual-radar OTHR system was not considered until [5].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous operation of two over-the-horizon radars

2004

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“…The HF radar signal is usually contaminated by strong transient interference, such as impulsive lightning and meteor echoes. Filtering out the interference in the time domain is possible [2], but it results in missing pulse bursts. Transmitting the SFW and excising the transient interference results in signal deficiency in 2D, simultaneously in the frequency domain and time domain.…”

Section: Introductionmentioning

confidence: 99%

High Resolution RD Reconstruction for Two-dimension Sparse HF Radar

Jin¹,

Liu²

2016

Proceedings of the 2016 International Conference on Sensor Network and Computer Engineering

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Abstract.A novel high resolution range-Doppler (RD) reconstruction method for high frequency (HF) radar via compressed sensing (CS) is proposed. In this framework, discontinuous frequency sub-bands and incomplete pulse bursts are used to reconstruct high resolution range profiles (HRRPs) and Doppler spectrum simultaneously. The method is capable of effective suppression of sidelobes introduced by bandwidth discontinuity and preservation of temporal coherence of the signal in Doppler analysis despite the time samples deficiency. Simulation and experiment results have demonstrated the effectiveness of the proposed method.

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“…Secondly, the IMI brings broadband noise with high-amplitude into the entire range of Doppler search space, significantly limiting the target detection performance of the OTHR. Typical external IMI can be either natural or man-made, including the echo of meteor trail from the universe [9][10][11], the air lightning [12], the shortwave radio communication electromagnetic wave interference [8] and etc. The IMI-s are usually 20-40 dB stronger than the thermal noise at the receiver [14], where the former brings the dominant impact on OTHR performance over the latter and the attentions are usually paid to the former.…”

Section: Introductionmentioning

confidence: 99%

“…The IMI-s are usually 20-40 dB stronger than the thermal noise at the receiver [14], where the former brings the dominant impact on OTHR performance over the latter and the attentions are usually paid to the former. The impact arising from external IMI reduces the radar sensitivity on the order of 10 dB, making it unacceptable for the OTHR to track small aircrafts [12].…”

Section: Introductionmentioning

confidence: 99%

Subspace Impulsive Interference Suppression in Othr

Liu¹,

Chen²,

Wang³

et al. 2009

PIER C

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Abstract-This paper proposes a novel subspace projection algorithm for impulsive interference (IMI) suppression in echo samples received by an over-the-horizon radar (OTHR). We particularly highlight the model that the frequency spectrum of IMI component is a complex cosine signal such that IMI cosine can be filtered out by subspace projection. Compared with existing algorithms, a more simple clutter suppression algorithm is used to reject the most powerful clutter components. Furthermore, this algorithm will neither estimate nor need the exact temporal position of IMI, which avoids the impact resulted from the position estimation error. Another advantage is its little impact on true target signal and no impact on the clutter. Experimental results based on data from real high frequency surface wave (HFSW) OTHR systems are also shown to verify the proposed algorithm.

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Over-the-horizon radar sensitivity enhancement by impulsive noise excision

Cited by 36 publications

References 2 publications

Simultaneous operation of two over-the-horizon radars

Simultaneous operation of two over-the-horizon radars

High Resolution RD Reconstruction for Two-dimension Sparse HF Radar

Subspace Impulsive Interference Suppression in Othr

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