Adaptive Signal Processing Using A Liquid Crystal Television

Welstead, Stephen T.; Ward, Michael J.; Blanchard, Denise M.; Brost, George A.; Halby, Sandra L.

doi:10.1117/12.962389

Cited by 2 publications

(4 citation statements)

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“…This interface will limit the achievable weight update rate and will be the emphasis of future efforts addressing insertion into a C-band radar test-bed. 6. ACKNOWLEDGEMENTS This work has been performed in-house at the Rome Laboratory Photonics Center, and has been supported by Rome Laboratory Contracts F30602-91-D-0001 (Stanford Research Institute subcontract C-140545) and F30602-92-C-0026.…”

Section: Discussionmentioning

confidence: 98%

“…The output from the AO tapped delay line subsystem is the estimate given in Equation 6. This output is subtracted from the main channel signal to form the error signal.…”

Section: Ao Tapped Delay Line Filtermentioning

confidence: 99%

“…In the multichannel architecture described here, each channel of the multichannel AOSLM taps the corresponding channel of a multichannel AOTDL. The resulting tapped outputs from the AOTDL are combined onto a photodiode to achieve the filtered result given in Equation 6.…”

Section: Ao Tapped Delay Line Filtermentioning

confidence: 99%

“…The convolution of the updated weight function with the composite noise from a given auxiliary channel is summed over all auxiliary channels to form the estimate of the noise contained in the main channel T dest(t) = R , (6) where R is the total number of auxiliary channels and T is the temporal length of each of the tapped delay line filters. This estimate is then subtracted from d(t) to form the new error signal that then readdresses the correlator through Equation 5.…”

Section: Introductionmentioning

confidence: 99%

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<title>Multichannel optical time-integrating correlator for adaptive jamming cancellation</title>

Zari

Berinato

Ward³

et al. 1992

SPIE Proceedings

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Hardware implementation of the steepest descent algorithm, as applied to multichannel adaptive jamming cancellation, requires the realtime correlation of wide bandwidth signals from multiple input channels. The described optical system uses a single-channel acousto-optic (AO) deflector as an input device for the adapted main antenna signal, where multiple jamming sources mask the target return, and a multichannel AO deflector as the input device for an array of auxiliary antennas, each receiving jamming energy. A time-integrating correlation between the main and auxiliary channels is calculated optically and produces an update to each weight function (stored in computer memory) in accordance with a steepest descent algorithm. The updated weight functions are optically reconstructed and used to tap a multichannel AO delay line, which carries the information from the array of auxiliary channels. A spatial sum of the output from the weighted delay line yields an estimate to the noise in the main channel. The multichannel optical time-integrating correlator has demonstrated realtime parallel computation of the correlation between two wide bandwidth auxiliary channels and the adapted main channel.

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Section: Discussionmentioning

confidence: 98%

“…The output from the AO tapped delay line subsystem is the estimate given in Equation 6. This output is subtracted from the main channel signal to form the error signal.…”

Section: Ao Tapped Delay Line Filtermentioning

confidence: 99%

Section: Ao Tapped Delay Line Filtermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

<title>Multichannel optical time-integrating correlator for adaptive jamming cancellation</title>

Zari

Berinato

Ward³

et al. 1992

SPIE Proceedings

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Comparison of spatial light modulators for multipath delay estimation

Ward

Keefer

Grucza

et al. 1990

Spatial Light Modulators and Applications

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A spatial light modulator (SLM) may be used to variably tap and weight an acousto-optic (AO) delay line. This SLM application occurs in the optical signal processing of multipath delays from radar or other communication sources, as has been demonstrated with various electro-optic processing architectures1.2,3. These multipath delays signal must be estimated and suppressed to ensure optimal system performance. In the architecture presented here, the SLM must accurately select and weight various delays of a signal that propagate across an acousto-optic modulator. This paper reports the relative performance characteristics of the following spatial light modulators used in this application: an AO deflector used as an SLM (AOSLM), a liquid crystal television display (LCD) and a magneto-optic SLM (MOSLM).

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Adaptive Signal Processing Using A Liquid Crystal Television

Cited by 2 publications

References 0 publications

<title>Multichannel optical time-integrating correlator for adaptive jamming cancellation</title>

<title>Multichannel optical time-integrating correlator for adaptive jamming cancellation</title>

Comparison of spatial light modulators for multipath delay estimation

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