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OThR - Optical transmission systems

OFC/NFOEC Technical Digest. Optical Fiber Communication Conference, 2005., 2005
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Towards an Accuracy Bound for OTHR

2018 International Conference on Radar (RADAR), 2018
Skywave over-the-horizon radar is a sensor modality that uses refraction of radio waves through the Earth's ionosphere to observe at very long range. An OTHR system uses secondary sensors to probe the ionosphere in order to characterise propagation. The accuracy of estimated positions from OTHR depends on both the radar measurements and the system's ...
Samuel J. Davey, Robert Gardiner-Garden
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Method to Suppress Transient Interference in the Skywave OTHR

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019
Skywave over-the-horizon radar (OTHR) plays an important role in the out-of-sight surveillance. But the operational performance usually degrades due to transient interferences. To excise the transient interference, most existing methods cannot get rid of the step of data interpolation, which is always computationally expensive.
Ziwei Liu 0004, Shanshan Zhao, Gengxin Zhang   +2 more
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Delay compensation of stretching signal in OTHR

6th International Conference on Signal Processing, 2002., 2003
In the stretch processing system of linear FM (chirp modulation), the time delay of the return is converted into frequency. The frequency and time delay are proportional to the target range. Each intermediate frequency (IF) pulse occupies a different time interval, indicating the variation in time delay as a function of range.
null Zhiqun Yang, null Jinlin Ni, null Guosui Liu   +2 more
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OTHR multipath tracking using the bernoulli filter

IEEE Transactions on Aerospace and Electronic Systems, 2014
A multipath target tracking and recognition algorithm is proposed for an over-the-horizon radar (OTHR) tracking system in the presence of detection uncertainty and clutter. This algorithm, multipath Bernoulli filter (MPBF), uses a generalization of the Bernoulli filter for joint detection and tracking of a single target.
Jinfeng Chen, Hong Ma, Cheng-Guo Liang, Yufeng Zhang   +3 more
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Terrain compensation for OTHR receive array

Proceedings of IEEE Antennas and Propagation Society International Symposium, 2002
The performance of an OTHR array situated on irregular terrain is presented, and the compensation of the effects of terrain irregularities is illustrated. The model used evaluates the effects of long correlation intervals on the received pattern by taking into account both the vertical terrain deformation and the effects of local ground tilt on the ...
K. Chang, F.H. Beltran
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Modelling OTHR tracks for association and fusion

Proceedings of the 1996 IEEE National Radar Conference, 2002
The Jindalee high frequency OTH radar network sensors are capable of detecting and tracking a very large number of tracks within surveillance regions that can overlap. The large number of tracks can lead to ambiguity especially on the regions boundaries.
A. Cameron, G. Habermann, M. Mohandes, R.E. Bogner   +3 more
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Research on ionospheric phase decontamination for OTHR

2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), 2014
Ionospheric phase decontamination is a key step to detect ship targets for OTHR. A PGA algorithm based on adaptive clutter filter bandwidth extraction is proposed for small amplitude, slowly varying type phase contamination that can be used to solve clutter filter bandwidth selection.
Xue Li, Rui Wang, Dongsheng Yang, Na Wei
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Electromagnetic modelling of ship classification in OTHR

2008 8th International Symposium on Antennas, Propagation and EM Theory, 2008
Because of the Faraday rotation effect in the ionosphere, the elliptical polarization high frequency electromagnetic wave is used to simulate the sky wave to illuminate the ship targets. The half space FDTD method is utilized to model the ship targets on ocean which have the similar structures.
null Cong Chen, null Huotao Gao
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A wideband technique for micro-ranging in OTHR

2008 IEEE Radar Conference, 2008
A method for utilizing wideband transmissions (>100 kHz) in OTHR is proposed. The technique involves the aggregation of multiple narrow band signals into a wideband composite through digital synthesis. The multi-channel signal is received digitally and after normal correlation and Doppler processing is recombined using Whitehead-Malekpsilas phase ...
Rod I. Barnes, G. Fred Earl
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