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In this paper, an optimal distributed fusion estimation algorithm is presented for multi-sensor non-uniform sampling systems with the correlated process noise and measurement noises at the same time and network-induced packet dropouts. First, the non-uniform sampling problem is first transformed to a single-rate synchronous sampling problem. Then, local optimal filters and the filtering error cross-covariance...
This paper is concerned with the distributed fusion estimation problem for a class of multi-sensor non-uniform sampling systems with correlated noises and fading measurements. The state is updated uniformly and the sensors sample measurement data randomly. The process noise and different measurement noises are correlated at the same instant. Moreover, the fading measurement phenomena may occur in...
Vector tracking loop (VTL) can be regarded as a kind of integration of navigation filter and signal tracking. It has a better performance for weak signal and can recapture signal quickly, but its robustness and computation complexity is worse. This paper mainly studies a tight integration model of navigation filter and tracking filter, which remains the signal tracking filter in local channels and...
Phyllosilicate is a principal form of hydrous minerals on the martian surface. It's also an indicative mineral in comparing different sediments and degree of aqueous alteration. Shortwave infrared (SWIR) and thermal infrared (TIR) spectral bands have distinct spectral response to the mineral groups and ions. However, combining SWIR and TIR to recognize phyllosilicate has been rarely studied. Based...
Nocturnal lighting is directly related to human activity and has been used in modeling population density. Mismatch of spatial scale between county and pixel results in noticeable discrepancy in Digital Number (DN). Consequently, this paper focuses on the limitation and proposes a method to model population density using the DMSP-OLS night-time data. MODIS land cover product was employed to identify...
Sparse unmixing algorithm aims at finding the optimal subset of signatures from a spectral library to best model each pixel in hyperspectral image and estimating their corresponding abundance. However, the high mutual coherence of spectral library limits the performance of sparse unmixing algorithm. In this paper, a method referencing the extracted information from hyperspectral image was managed...
The estimation problem for a class of non-uniform sampling linear stochastic systems with missing measurements is considered, where the state is updated uniformly and the sensor non-uniformly samples the measurement once at most in a state update period. By using innovation analysis approach, the optimal state estimators are designed at the state update points and measurement sampling points based...
The detection of hydrous minerals on Mars is of great importance for revealing the early water environment as well as possible biotic activity. However, few studies focus on quantitatively retrieving hydrous minerals for some difficulties. In this letter, we studied the area around the Mars Science Laboratory (MSL) landing site, to identify hydrous minerals and retrieve their abundance. Firstly, the...
This paper is concerned with the distributed fusion filtering problem for a class of asynchronous multi-rate multisensor non-uniform sampling discrete stochastic systems, where the state is updated at the highest sampling rate and different sensors may have different lower measurement sampling rates. Furthermore, the state is updated uniformly and the measurement is sampled non-uniformly. The non-augmented...
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