Direct position determination of wideband signals: Coherent and noncoherent approach

Pokrajac, Ivan; Vucic, Desimir; Okiljevic, Predrag

doi:10.1109/telsks.2013.6704897

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…Starting from the simple observation of the circuit, one may determine that there is a correlation because there is variation in the supply voltage , which leads to a change in the current of the circuit that is circulating through resistance . The objective is that the student notices the direct relationship between the physical phenomena, the concept, and the mathematical representation Conceptually, the correlation is mathematically [24] defined as (22). The covariance associated with the estimates of two input magnitudes X i and X j may be considered equal to cero or negligible when the input magnitudes X i and X j are independent, one of them is constant, or there is not enough information to evaluate it.…”

Section: Correlation Determinationmentioning

confidence: 99%

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Determination of Uncertainty in Measuring Instruments in Electrical Engineering Programs

Espinel-Ortega

Vega-E

2019

TecnoL.

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When electrical engineering students start their instrumentation and measurement course, they have previously taken calculus, physics, probability, and statistics. However, they have problems to apply the knowledge they acquired to solve problems related to electrical measurements and variables in the profession, such as water flows, solar radiation, wind speed and water levels. This paper shows how to integrate all the concepts involved in the process to calculate measurement uncertainty in order to improve the way the results of measurements and/or error determination processes are described. For that purpose, this study presents an applied exercise and a methodological process by means of an example, where the value of a resistance is determined taking into account the data of voltage and current measurements and using few data. The objective is to focus the process on estimating Type A and Type B uncertainty and the factors that affect the measurement processes, such as uncertainty due to random variations of the measured signals, instrument defects, imprecision of the instruments, or their resolution. During the calculation of uncertainty proposed here, students use the probabilistic knowledge they have acquired after they determined the value of the uncertainty U from the combined uncertainty u𝑐 (R), where the coverage factor is taken into account. This allows us to learn about the importance of expressing the results with higher (+) or lower (-) values of uncertainty. In the exercise carried out in this work, R = 733.31 +/- 8.10 ohm.

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Section: Correlation Determinationmentioning

confidence: 99%

“…For this problem, it will be necessary to determine the correlation between the average Voltage = measured and average Current = measured . We should take into account that the product of the two standard deviations (24), can also be seen in (23).…”

Section: Correlation Determinationmentioning

confidence: 99%

Determination of Uncertainty in Measuring Instruments in Electrical Engineering Programs

Espinel-Ortega

Vega-E

2019

TecnoL.

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“…In [ 30 ], a high resolution DPD method of multiple emitters based on minimum-variance-distortionless-response (MVDR) is proposed, which does not require the prior knowledge of the number of signals. In [ 31 ], the DPD methods in the light of coherent and noncoherent pre-processing techniques of wideband signals are proposed, increasing the location accuracy of DPD. In [ 32 ], the DPD estimator of indoor radio sources for hybrid antennae is derived, which has better robustness to multipath interference in indoor environments.…”

Section: Introductionmentioning

confidence: 99%

A Direct Position Determination Method Based on Subspace Orthogonality in Cross-Spectra under Multipath Environments

Zhu

Jiang

Huo

et al. 2022

Sensors

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Without the estimation of the intermediate parameters, the direct position determination (DPD) method can achieve higher localization accuracy than conventional two-step methods. However, multipath environments are still a key problem, and complex high-dimensional matrix operations are required in most DPD methods. In this paper, a time-difference-of-arrival-based (TDOA-based) DPD method is proposed based on the subspace orthogonality in the cross-spectra between the different sensors. Firstly, the cross-spectrum between the segmented received signal and reference signal is calculated and eigenvalue decomposition is performed to obtain the subspaces. Then, the cost functions are constructed by using the orthogonality of subspace. Finally, the location of the radiation source is obtained by searching the superposition of these cost functions in the target area. Compared with other DPD methods, our proposed DPD method leads to better localization accuracy with less complexity. The superiority of this method is verified by both simulated and real measured data when compared to other TDOA and DPD algorithms.

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“…Based on the continuous signal model, the method can effectively locate the wideband or narrowband signal target. In [26], the coherent and incoherent direct localization methods are studied for wideband signals. By using the two preprocessing techniques, broadband processing gain can be improved.…”

Section: Introductionmentioning

confidence: 99%

A Frequency Domain Direct Localization Method Based on Distributed Antenna Sensing

Zhao

Zheng

et al. 2021

Wireless Communications and Mobile Computing

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Traditional two-step passive localization methods need to extract the parameters like the direction of arrival (DOA), time of arrival (TOA), and time difference of arrival (TDOA) from the original data to determine the source position, which causes the poor positioning accuracy due to error accumulation. In this paper, a direct position determination (DPD) method is proposed to improve the positioning accuracy and robustness, which is based on a correlation algorithm. Firstly, the cost function directly related to the location of the source can be established by synthesizing the data received by multiantenna in the frequency domain. Then, the position of the source is estimated by the correlation DPD method to search the monitoring area. Compared to the improved TDOA algorithm and Least Squares DPD algorithm, the proposed method shows better localization accuracy of different SNRs. Finally, based on real measured data, it can be seen that the results of the proposed algorithm are better than the improved TDOA algorithm.

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Direct position determination of wideband signals: Coherent and noncoherent approach

Cited by 6 publications

References 4 publications

Determination of Uncertainty in Measuring Instruments in Electrical Engineering Programs

Determination of Uncertainty in Measuring Instruments in Electrical Engineering Programs

A Direct Position Determination Method Based on Subspace Orthogonality in Cross-Spectra under Multipath Environments

A Frequency Domain Direct Localization Method Based on Distributed Antenna Sensing

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