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The technology of navigation and localization for Multi-Autonomous Underwater Vehicles (AUVs) is an important way to solve the problem of complex operation environment. This paper addresses the problem of Multi-AUVs cooperative navigation and localization, based on the Leader-Fellow form. Then, Extended Kalman Filter (EKF) algorithm is proposed to solve this problem. A navigation model of the slave...
For the problem of Direct Sequence spread spectrum unbalance Quadrature Phase Shift Keying (DSSS/UQPSK) signal can't be detected easily, the method of the fourth-order cumulant detection is proposed in this paper. On the basis of the fourth-order cumulant of the Gaussian White Noise is equal to zero, Firstly, the paper analyzes the theory knowledge of direct sequence unbalance QPSK signal and the...
Owing to the frequency-selective fading channel with a carrier frequency of OFDM (orthogonal frequency division multiplexing) signal to noise ratio (SNR) estimation problem, we proposed SNR blind estimation method based on air carrier OFDM system. Due to the inconsistency between the oscillator and the received signal, the received signal will be with a certain deviation. The presence of frequency...
This paper proposes a robotic eye based on spherical parallel mechanism with three degrees of freedom. It aims to imitate the human eye with active vision for robots in various unstructured environments. Its kinematic analysis and performance estimation indexes are presented. For the pursuit of best velocity and acceleration accuracies of the eyeball, an optimal design method using evolutionary strategy...
To be sure that the telecommunication satellite can work well in the complexity electromagnetic environment and electromagnetic jamming, a novel space-borne antenna multi-jamming direction finding and nulling method is presented in the paper. Firstly, single-snapshot DOA estimation algorithm in frequency is presented to estimate the DOAs of multiple interferences, and then nulling algorithm that keep...
Cannonball dispersion evenness is the main parameter for the design and optimization of future air window. The key of solution of cannonball dispersion evenness is the computations of the biggest value and smallest value of a 2D continuous function, which has many maximum values and minimum values. Moreover, as it need to compute the biggest value and smallest value for many times in the design and...
In the research of antiaircraft system, how to make full use of the firepower units and cause maximum damage to enemy targets, is a key problem of firepower allocation. Based on the characteristics of the antiaircraft system, the description of firepower allocation for antiaircraft system is presented and the mathematical model is established. The calculational method of threaten estimation is given...
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