Theoretical limitation of the sea on the detection of low Doppler targets by over-the-horizon radar

Maresca, Joseph W.; Barnum, J.

doi:10.1109/tap.1982.1142910

Cited by 21 publications

(9 citation statements)

References 8 publications

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“…Equation (20) evaluated at (X, Y ) = 0 is the temporal autocorrelation of the radar signal. This function decays to one half of its initial value in a time T 1/2 ≤ 100 s. This T 1/2 is the "correlation time" corresponding to one ionospheric transit, and is twice the two-way ionospheric transit correlation times discussed in the literature ( [10] and others cite a maximum correlation time of 50 s). The Doppler resolution ∆ω is the 3-dB width of the Fourier transform of the temporal autocorrelation function.…”

Section: Ship Detectabilitymentioning

confidence: 84%

“…Expressions for the HF radar cross section σ(ω) of the ocean per m 2 ocean surface area per rad/s bandwidth have been presented [9] and have been used for ship detectability calculations for particular over-the-horizon radar systems [10]. We assume that the incident signal on the patch of ocean is at a low elevation angle (<20 degrees), and for simplicity take the surface wave radar to be more or less on a line connecting the target and skywave radar, as depicted in Figure 1.…”

Section: The Ocean Cross Sectionmentioning

confidence: 99%

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Limits on the detection of low-Doppler targets by a High Frequency hybrid sky-surface wave radar system

Riddolls¹

2008

2008 IEEE Radar Conference

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A High Frequency (HF) radar system comprising a skywave transmit channel and surface wave receive channel is studied. Simple analytic expressions for the resolution of this radar system are determined by considering the spreading of radar signals in Doppler and angle during the ionospheric propagation. The detection of ocean surface targets within the patch of ocean surface illuminated by the radar beam is then determined by comparing the radar cross section of the ocean patch with typical vessel radar cross sections. It is shown that a hybrid sky-surface wave radar can detect low-Doppler ships down to 30 dBm 2 cross section during the day and down to 40 dBm 2 at night, during calm ionospheric conditions. During periods of spread F ionospheric turbulence, where the temporal correlation time decreases by an order of magnitude, the corresponding vessel detection capability decreases by two orders of magnitude.Index Terms-over-the-horizon radar, high frequency radar, ocean clutter.

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Section: Ship Detectabilitymentioning

confidence: 84%

Section: The Ocean Cross Sectionmentioning

confidence: 99%

Limits on the detection of low-Doppler targets by a High Frequency hybrid sky-surface wave radar system

Riddolls¹

2008

2008 IEEE Radar Conference

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“…In the reference [3,4], it refers that beam width is related to Doppler spectrum. The formula [5] is 2 2…”

Section: B Doppler Spectrum Broadeningmentioning

confidence: 99%

The application of HBF in small aperture OTHR

Luo

2015

2015 8th International Congress on Image and Signal Processing (CISP)

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Due to the decrease of azimuth resolution and array gain, the performance of small aperture over the horizon radar (OTHR) is not as good as the conventional OTHR. Therefore, it is necessary to find a new method to improve array performance of small aperture OTHR to satisfy the requirements of target detection. In this paper, conclusions on the performance losses are obtained by deducing the expression of signal to clutter ratio (SCR) under small aperture OTHR receiving condition. Based on the conclusions, Hyper Beam, which is derived from sonar array processing, are applied to improve the performance of small aperture OTHR. Eventually, experimental simulations are given to verify our conclusions.

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“…It is widely used in ocean state remote sensing, marine ships and aircrafts detection for both military and civilian applications [1][2][3][4][5]25].…”

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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Theoretical limitation of the sea on the detection of low Doppler targets by over-the-horizon radar

Cited by 21 publications

References 8 publications

Limits on the detection of low-Doppler targets by a High Frequency hybrid sky-surface wave radar system

Limits on the detection of low-Doppler targets by a High Frequency hybrid sky-surface wave radar system

The application of HBF in small aperture OTHR

Subspace Impulsive Interference Suppression in Othr

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