?ADS-B IN and TCAS Once ADS-B IN technology can be achieved onboard, it can be used to replace conventional TCAS. ?Conventional track generation methods Kalman filtering, particle filtering, motion models and data min...
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ISBN:
(纸本)9781479989522
?ADS-B IN and TCAS Once ADS-B IN technology can be achieved onboard, it can be used to replace conventional TCAS. ?Conventional track generation methods Kalman filtering, particle filtering, motion models and data mining ?ADS-B data more than 280 million, CAT021 format v0.26.
The signal multipath effect is one of the main reasons which lead to positioning error in the Global Positioning System （GPS）. Although the differential technology can improve the positioning accuracy, the different...
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ISBN:
(纸本)9781467321969
The signal multipath effect is one of the main reasons which lead to positioning error in the Global Positioning System （GPS）. Although the differential technology can improve the positioning accuracy, the differential GPS system still can’t eliminate the positioning error caused by multipath signals, the reference stations and users being in different geographical environment. In the light of the GPS multipath signal model, this paper presents a GPS time delay estimation algorithm based on signal separation estimation theory. Firstly, Doppler frequency is estimated when the signal delay is unknown. Then, we use the estimated Doppler frequency to get signal delay information with signal separation estimation theory. In addition, we consider the previous estimated results as the initial value and a two-dimension optimization method is implemented in a small range for further improving the estimation accuracy. It can be shown from the simulation results that this method which is able to effectively eliminate the multipath has a better performance compared with the conventional method and narrow correlator spacing algorithm.
A new filtering scheme using generalized morphological operators and fuzzy logic is proposed for suppressing speckle noise in images. The algorithm employs generalized morphological close-open and open-close operation...
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Automatic Dependent Surveillance-Broadcast (ADS-B) is vulnerable to spoofing interference which will lead to the failure of Air Traffic Management (ATM) systems. This paper proposed an effective approach to detect and...
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ISBN:
(纸本)9781479989522
Automatic Dependent Surveillance-Broadcast (ADS-B) is vulnerable to spoofing interference which will lead to the failure of Air Traffic Management (ATM) systems. This paper proposed an effective approach to detect and suppress the spoofing interference based on a cross-antenna array without estimating the direction of arrival (DOA) of the received signal. Firstly, the location of target is received by the antenna array. Then the azimuth and the elevation according to the antenna array are obtained based on the locations of target and the central element of array. Secondly, the signal from the estimated direction is suppressed by projecting the received signal onto the orthogonal complement space of estimated steering vector. Finally, the target is recognized as a real target or spoofing according to the spoofing decision algorithm. The simulation results show the effectiveness of the proposed algorithm.
In this paper, two common encounter geometries of aircrafts in terminal area are discussed. Probabilistic modes for aircraft motions are developed based on three-dimensional Brownian motion. The two common encounter g...
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ISBN:
(纸本)9781467321969
In this paper, two common encounter geometries of aircrafts in terminal area are discussed. Probabilistic modes for aircraft motions are developed based on three-dimensional Brownian motion. The two common encounter geometries can be expressed in the same formula. After the non-orthogonal and orthogonal transformations, three-dimensional Brownian motion is standardized and the formula is simplified to derive the analytical solution. The conflict probability is equal to the probability that a standard three-dimensional Brownian motion hits a time-varying region. An approximation algorithm is given based on Bachelier-Levy theorem to get the analytical expression of conflict probability.
On the basis of theory for Discrete Wavelet Transform (DWT) of signal statistical characteristics and Dynamic Multi-scale System (DMS) of the state transition model, a novel algorithm for multi-scale fusion and estima...
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ISBN:
(纸本)9781467321969
On the basis of theory for Discrete Wavelet Transform (DWT) of signal statistical characteristics and Dynamic Multi-scale System (DMS) of the state transition model, a novel algorithm for multi-scale fusion and estimation with multi-resolution sensors is derived. In order to construct a uniform resolution model of Kalman Filter, the equations of state and measurement are processed with DWT at different resolution levels, and then the measurements of the same resolution level are fused and filtered. Experimental results indicate that the proposed method is more effective than other existing algorithms.
Adaptive arrays (or adaptive beamformers) are now widely used in radar, sonar, and communications to suppress various kinds of interference. In radar applications, adaptive beampatterns with low sidelobes and stable m...
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The paper presents a new tracking scheme based on the object-strips color (OSC) feature. Firstly, the images captured by the camera are transformed into a format which is suitable for object tracking. Secondly, backgr...
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Recently, iris recognition has been paid more attention due to its high reliability in personal identification. But iris feature extraction is easily affected by some practical factors, such as inaccurate localization...
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