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In this paper, a novel algorithm of rotational parameter estimation is proposed for high-resolution inverse synthetic aperture (ISAR) imaging of maneuvering targets. For a non-uniform rotation target, the signal model is formulated. Then, an entropy minimization approach is used to estimate the rotational parameters, which is solved by using a coordinate descent algorithm based on quasi-Newton method...
Pose estimation is the most important step of nature interactive between human and machine, and body part recognition is the core of pose estimation. This paper describes an improved random forests method to recognize each part of the human body. What is different from the traditional random forest structure is that the algorithm proposed in this paper provides a feature Pre - selection for examples...
In Global Navigation Satellite Systems (GNSS), the satellite selection algorithm is very important for increasing navigation location precision, in which visible satellite geometry is the most crucial factor. There are two algorithms for selecting stars: one is by calculating GDOP such as classical optimal algorithm, best GDOP algorithm and so on. However, it requires a long time for the computing...
Location-based services are widely used in the Internet services. The method of location cloaking is used to effectively protect the user's location privacy. The current cloaking algorithm does not take into account the regional characteristics, such as population density, popularity level and so on, based on which an attacker can often infer user's exact location from their cloaking area. In this...
Counting or estimating the number of tags is crucial for RFID system. Researchers have proposed several fast cardinality estimation schemes to estimate the quantity of a batch of tags within a short time frame. Existing estimation schemes scarcely consider the privacy issue. Without effective protection, the adversary can utilize the responding signals to estimate the number of tags as accurate as...
We characterize the chaotic dynamics of an optical micro ring resonator subject to amplitude modulate. The simulation results demonstrate that, by changing the modulation coefficient and input power, we can obtain rich nonlinear dynamics, such as, period, bifurcation and chaos. Moreover, we adopt the permutation entropy to quantify the complexity of the resonator's output, the results not only qualitatively...
In view of conventional contrast enhancement algorithms usually adopt a global approach to enhance all the brightness level of the images which lead to some detailed information being lost and enhancement of the noise in noisy environment, and the remote sensing image contains a lot of low contrast and poor resolution textual information, a fuzzy contrast enhancement algorithm using fuzzy theory in...
Memory is one of the most restricted resources in embedded system. Code compression techniques address this issue by reducing the code size of programs. Huffman coding is the most common used coding method. But during the process of generating symbols from instruction, an experience-based partition way is usually used, which may cause information redundancy. This paper presents an optimal-partition...
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