Results 211 to 220 of about 64,399 (240)
IET Radar, Sonar and Navigation, 2012 In this study, a constrained total least-squares (CTLS) algorithm for estimating the position and velocity of a moving source with sensor location uncertainties that uses the time difference of arrival and frequency difference of arrival measurements of a signal received at a number of sensors is proposed.
Guohe Huang
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Aliasing-free broadband direction of arrival estimation using a frequency-difference technique
The Journal of the Acoustical Society of America, 2021When the intersensor spacing of a uniform linear array (ULA) is larger than the half-wavelength of an incident narrowband signal, spatial aliasing is generated. For broadband signals, the broadband spatial spectrum is still affected as a result of the spatial aliasing in each frequency bin. In this paper, an aliasing-free broadband direction-of-arrival
Long Yang, Yong Wang, Yixin Yang
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The Journal of the Acoustical Society of America, 2007
Much research has been done in the area of estimating time-difference-of-arrival (TDOA) and frequency-difference-of-arrival (FDOA) and their use in locating a radiating source. Early work in this area focused on locating acoustic sources using passive sonar processing.
Mark L. Fowler, Xi Hu
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Much research has been done in the area of estimating time-difference-of-arrival (TDOA) and frequency-difference-of-arrival (FDOA) and their use in locating a radiating source. Early work in this area focused on locating acoustic sources using passive sonar processing.
Mark L. Fowler, Xi Hu
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The Journal of the Acoustical Society of America, 2022
In this paper, we consider the problem of bearing ambiguity in the direction of arrival (DOA) estimation due to spatial aliasing when the minimum wavelength of the processing broadband signal is less than the element spacing of a uniform linear array (ULA). First, an extended frequency-difference (FD) method is presented. Unlike the existing FD methods,
Xin Wang +4 more
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In this paper, we consider the problem of bearing ambiguity in the direction of arrival (DOA) estimation due to spatial aliasing when the minimum wavelength of the processing broadband signal is less than the element spacing of a uniform linear array (ULA). First, an extended frequency-difference (FD) method is presented. Unlike the existing FD methods,
Xin Wang +4 more
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Frequency difference of arrival accuracy
IEEE Transactions on Acoustics, Speech, and Signal Processing, 1989The problem considered occurs in the geolocation of a fixed emitter using observations from two moving collectors. Estimates for the time difference and frequency difference of signal arrivals are used. Frequency difference of arrival (FDOA) is estimated through the use of a mixing product.
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IET Radar, Sonar and Navigation, 2014 In a recent study, Yu et al. , a constrained total least‐squares algorithm to estimate the position and velocity of a moving source with sensor location uncertainties was proposed. However, two errors appeared in this study.
Xiangwei Meng
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Relative Times of Arrival of Bursts of Solar Noise on Different Radio Frequencies
Nature, 1947It is becoming recognized that on metre wave, lengths solar noise from the disturbed sun is characterized by the occurrence of sudden large increases in intensity of a duration of several seconds or minutes. Bowen1, of this Laboratory, has reported that these increases of intensity are not necessarily coincident in time or shape when observed on ...
R, PAYNE-SCOTT +2 more
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Phase difference of arrival distance estimation for RFID tags in frequency domain
2011 IEEE International Conference on RFID-Technologies and Applications, 2011The paper gives an overview of phase based ranging techniques, focusing on the phase difference of arrival method measured in frequency domain (FD-PDoA). After a theoretical overview of distance estimation and localization, it introduces an experimental RFID front-end prototype used for FD-PDoA measurements. Proposed modular design is very flexible and
Ales Povalac, Jiri Sebesta
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Emitter position and velocity estimation given time and frequency differences of arrival
2010 Conference Record of the Forty Fourth Asilomar Conference on Signals, Systems and Computers, 2010Consider the problem of estimating the position and the velocity of an emitter given time and frequency differences of arrival acquired by a passive sensor array. By jointly eliminating the non-linear nuisance parameters of the model using an appropriate orthogonal projection, we obtain a least squares estimator of the parameters of interest.
Alon Amar +2 more
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Airborne passive location based on combined time and frequency difference of arrival
International Journal of Microwave and Wireless Technologies, 2009Passive location techniques have always been considered an important topic and recently, thanks to digital signal processing (DSP) advances, new methods are being studied and experimented with. The possibility to passively locate radar emitters avoiding transmission is crucial in a variety of military applications, in particular when a flying platform (
Gaetano Severino +2 more
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