Wuhan University is located in Wuhan, Hubei, China, and is administered by the Ministry of Education of the People's Republic of China. It was selected by both Project 985 and Project 211 as a major receiver of state funding. The university is situated at Luojia Hill, with palatial buildings blending the Chinese and Western style. It was commonly regarded as one of the most beautiful campuses in China. Wikipedia.
Fang X.,Wuhan University
Journal of Geodesy
A standard errors-in-variables (EIV) model refers to a Gauss-Markov model with an uncertain model matrix from a geodetic perspective. Least squares within the EIV model is usually called the total least squares (TLS) technique because of its symmetrical adjustment. However, the solutions and computational advantages of the weighted TLS problem with a general weight matrix (WTLS) are mostly unknown. In this study, the WTLS problem was solved using three different approaches: iterative methods based on the normal equation, the iteratively linearized Gauss-Helmert model with algebraic Jacobian matrices, and numerical analysis. Furthermore, sufficient conditions for WTLS optimization were investigated systematically as proposed solutions yield only necessary conditions for optimality. A WTLS solution was considered to treat random parameters within the EIV model. Last, applications to test these novel algorithms are presented. © 2013 Springer-Verlag Berlin Heidelberg. Source
Wuhan University | Date: 2013-11-05
A method for generating and compressing multi-sweep-frequency radar signals is provided, based on the idea of reducing the power density of signals on a time-frequency domain. By using a method of circumferentially shifting and superposing a single sweep-frequency signal, sweep-frequency signals multiplexed simultaneously at time and frequency are generated, and for the generated multi-sweep-frequency signals, the sweep-frequency signals are multiplexed simultaneously at time and frequency in a single pulse time period. The multi-sweep-frequency signals multiplexed at frequency are used to perform matched filtering, and then perform segmented accumulation to obtain distance resolution which is inversely proportional to the bandwidth and the signal-to-noise ratio after the single sweep-frequency signal is compressed under the same energy condition, thereby realizing secondary compression on the multi-sweep-frequency signals. The signals generated by the method have higher spectrum utilization rate and lower interception probability, and guarantee the distance resolution and detection distance of a radar.
Wuhan University | Date: 2013-03-05
The invention relates to a quick calibration method for an inertial measurement unit (IMU). According to the method, a user holds and rotates the IMU to move in all directions without any external equipment, so that twelve error coefficients including gyro biases, gyro scale factors, accelerometer biases and accelerometer scale factors can be accurately calibrated in a short time. The quick calibration method for the IMU is characterized by being free of hardware cost, high in efficiency and simple and easy to implement, and can ensure certain calibration precision. Thus, the quick calibration method is especially suitable for in-situ quick calibration for the medium- and low-grade IMUs, thereby effectively solving the problem of environmental sensitivity of the error coefficients of the mechanical IMU, and promoting popularization and application of MEMS (micro-electro mechanical systems) inertial devices.
Wuhan University | Date: 2014-12-19
An electrode material for a direct fuel cell or an electrochemical hydrogenation electrolytic tank, includes component A, or component B, or the mixture of component A and component B. The component A is any one of or a mixture of two or more than two of H
Massachusetts Institute of Technology, Wuhan University and Shanghai JiaoTong University | Date: 2014-03-13
This invention relates to methods, compositions, and kits for enzymatic phosphorothioation of the sugar-phosphate backbone of nucleic acids. The invention allows for phosphorothioation of pre-existing nucleic acids.