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Monocular visual odometry is an active research topic for mobile robot navigation due to its availability and simpleness. However, it inherently suffers from scale ambiguity inherently, so that the precesion of odometry becomes poor. In this paper, we propose a new method to resolve scale ambiguity for monocular visual odometry based on ground area extraction and a modified adaptive kalman-filter...
Spectral index method was widely applied to the inversion of crop chlorophyll content. In this study, PSR3500 spectrometer and SPAD-502 chlorophyll fluorometer were used to acquire the spectrum and relative chlorophyll content (SPAD value) of winter wheat leaves on May 2nd 2013 when it was at the jointing stage of winter wheat. Then the measured spectra were resampled to simulated TM multispectral...
The existing measurement analysis methods used to study the relationship between monetary policies and the stock market just take macro-historical data into account and do not consider micro-individual differences as well. This article overcomes these shortcomings by using Agent-based method. We simulate different micro-individual behaviors and then construct an artificial stock market in the computer...
Current markerless 3D registration methods usually utilize a single specified category of natural features. However, the richness of various natural features is ignored. They cannot meet users' diversified registration requirements. This article proposes an integration strategy of 3D registration methods based on multiple natural features. Utilizing feature detection and tracking and 3D registration...
Feedforward data-aided and non-data-aided carrier synchronization algorithms are commonly used for burst transmission. In this paper, we focus on the design of decision-directed carrier synchronization algorithm which can jointly estimate the frequency and phase offset for PSK transmission. Compared with other traditional methods, the proposed algorithm employ only a short length of preamble, while...
Inspired from social swarm intelligence, a cooperative boundaries tracking model with a mobile sensor network based on social foraging swarm behavior. In the model, the nodes of mobile sensor network are viewed as simple intelligent individuals of social swarm. The cooperative moving of the individuals is driven by sensed distribution environment. For boundaries tracking problems with mobile sensor...
Focusing on the carrier frequency recovery problem of PSK signals with low SNR and large frequency offset, an improved frequency estimator was proposed. Its estimation range is as large as a half symbol rate and its accuracy is close to MCRB. The analysis are confirmed by simulation.
Standard asset pricing models suggest that only systematic risk factors affect the expected returns of stocks. Using the data of Chinese stock markets from 2000 to 2006, this paper estimates the default risks implied in stock prices by structure model, tests whether the expected returns of stocks are related with implied default risks, and examines whether the default risk is a systematic risk factor...
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