Results 141 to 150 of about 34,935 (182)

Delay Doppler Transform

IEEE Wireless Communications Letters
This letter is to introduce delay Doppler transform (DDT) for a time domain signal. It is motivated by the recent studies in wireless communications over delay Doppler channels that have both time and Doppler spreads, such as, satellite communication channels. We present some simple properties of DDT as well. The DDT study may provide insights of delay
Xiang-Gen Xia
exaly   +3 more sources

Analysis of Spaceborne GNSS-R Delay-Doppler Tracking

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2014
For spaceborne Global Navigation Satellite System-Reflectometry (GNSS-R), the delay and Doppler frequency conditions dynamically change, so the compensation of the delay and Doppler errors using tracking is important to the altimetric and scatterometric performances.
Hyuk Park, Daniel Pascual, Adriano Camps   +2 more
exaly   +4 more sources

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Joint estimation of delay, Doppler, and Doppler rate

IEEE Transactions on Information Theory, 1960
The methods of inverse probability have been used by Woodward and others to obtain lower bounds on variances of radar parameter estimators. Previous results on the lower bounds of variances of delay and Doppler estimators have assumed that the reflecting object travels with a constant line of sight velocity and does not cause scintillation in the radar
P Bello
exaly   +2 more sources

Delay-doppler pocs for specular multipath

IEEE International Conference on Acoustics Speech and Signal Processing, 2002
A method is presented for resolving delay and Doppler specular multipath components using an extension of a previously developed projection onto convex sets (POCS) algorithm. To improve performance and convergence speed, a matched-filter based support constraint is incorporated into the variance of the residual constraint in the style of constrained ...
Douglas D. Colclough, Edward L. Titlebaum   +1 more
openaire   +2 more sources

Delay/Doppler altimeter data processing

2007 IEEE International Geoscience and Remote Sensing Symposium, 2007
The ESA Cryosat-2 mission will mount a de- lay/Doppler radar altimeter (DDA), named SIRAL, for the study of the trends in Earth's continental and marine ice fields. A DDA has many advantages over a conventional altimeter, retrieving a better resolution in the along track direction as a result of coherent processing of the backscattering energy.
Davide D'Aria, Pietro Guccione, Betlem Rosich, Robert Cullen   +3 more
openaire   +2 more sources

Diversity waveform sets for delay-Doppler imaging

IEEE Transactions on Information Theory, 1998
Summary: Properties of the ambiguity function and the uncertainty relation of Fourier transforms assert fundamental limitations on the ability of any single radar waveform of constrained time-bandwidth product to distinguish two or more targets closely spaced in both time-delay (range) and Doppler-shift (radial velocity).
M R Bell
exaly   +3 more sources

Efficient Estimation of a Sparse Delay-Doppler Channel

2020 54th Annual Conference on Information Sciences and Systems (CISS), 2020
Multiple wireless sensing tasks, e.g., radar detection for driver safety, involve estimating the "channel" or relationship between signal transmitted and received. In this paper, we focus specifically on the delay-doppler channel. This channel model has recently become relevant on the heels of the mmWave breakthrough, because the signals used ...
openaire   +1 more source

Delay-Doppler span estimation in OFDM radar

2011 45th Annual Conference on Information Sciences and Systems, 2011
In this paper, we propose a 2-dimensional (2D) delay-Doppler span estimation method based on the energy leakage suppression technique for OFDM pulse train radar systems. Unlike the existing methods which aim at resolving multiple target reflections, this estimator focuses on the span of the target on the 2D delay-Doppler plane, i.e., the nearest and ...
Wenshu Zhang, Huilin Xu, Liuqing Yang 0001   +2 more
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Comparison of Processing Algorithms for a Delay/Doppler Altimeter

IEEE Geoscience and Remote Sensing Letters, 2008
The use of a radar altimeter is to measure the height of the reflecting surface when the instrument passes overhead. A delay/Doppler altimeter (DDA) reduces the along-track resolution cell using correlation of pulses within burst, as in a synthetic aperture radar, with the net effect of synthesizing an array with a narrower lobe.
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Diversity waveform techniques in delay-Doppler imaging

SPIE Proceedings, 2003
Coherent Pulse-Doppler radar systems, whether used for synthetic aperture imaging or surveillance purposes, generally transmit a coherent pulse train made up of identical pulses. While these pulses may contain complex modulation---for example, linear FM chirps or frequency and phase coding---the fact remains that these pulses are usually identical.
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