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As Time difference of arrival (TDOA) needs high precision data for time delay estimation, a hardware system which can sample high precision data is presented in this paper. FPGA and DSP are taken as the general architecture in the hardware design. The precision of the system is improved by using GPS to synchronize time. The structure of the hardware system and the realization of data collection design...
This work focuses on the internal mechanism of adding window technology and its application in the truncated long code ultrasound system. First, a simple introduction of the truncated long code is given in which the transmitted pulses are coded using different short codes from burst to burst, and all the echoes are organized together coherently in the later estimation process to form a long code modulation...
We propose robust space-time interpolation method in presence of the antenna element error in this letter. The proposed method adds the correcting space-time steering vectors constraint around the space-time steering vector of the clutter. As a result, the proposed method can mitigate the range dependent problem in presence of the antenna element error in bistatic airborne radar system. The numerical...
In some handset multifunctional mobile systems, antenna used in both Global Positioning System (GPS) and Family Radio Service (FRS) are needed. A new antenna, combining microstrip antenna with monopole antenna, works in GPS-L1 band and FRS 2.21 GHz is investigated in this paper. The antenna can work as microstrip antenna and monopole antenna at the same time. The antenna is easy to be fabricated and...
A noncausal least-mean-squares (LMS) adaptive canceller for interference canceling of passive coherent location (PCL) radar is presented in this letter. The canceller is similar to a filter or estimator to minimize the difference between the echo and weighted reference signals. Considering the phenomenon of fractional delay (FD), which is inevitable in practical application, a noncausal LMS (NCLMS)...
According to the feature that the small moving target is highly sparse relative to the sky background in infrared image, a novel adaptive background subtraction method was presented. The small target in infrared image sequence can be directly detected by using the method based on compressive sensing. It also can significantly reduce the sampling of signal and transmission bandwidth. The simulation...
Log-periodic dipole antenna (LPDA) is a kind of frequency-independent antennas which is widely used. The design theory of the antenna is already mature. Although we can design the antenna with the best characteristic through the design theory, the size of the antenna is usually too large to be used. In this paper, we firstly establish the model of an antenna using the conventional theory and then...
The paper presents the way to improve the stability of the local oscillator using the technology of phase locking. Comparing different chips, we choose the chip Si4133 to design the local oscillator in the GNSS receiver RF-front. The product has the merits such as high stability, little size and low consumption. Finally we demonstrate the rightness and practical applicability of the design of local...
In low bit-rate video coding, all-zero block determination is a common technique to reduce the computational complexity of the encoder. We aim to improve the algorithm for the early detection of zero-blocks in H.264 video encoding. An improved algorithm for the early detection of all-zero blocks in H.264 video encoding is proposed in this paper. Based on the theoretical analyzes for the integer transform...
A novel single-layer reflectarray element with a crossed-dipole encompassed by an annulus patch, showing smooth phase characteristic curves, is proposed in this paper. Based on this element, a 94GHz single-layer reflectarray antenna has been designed. The results show that this novel element application has a great performance in millimeter-wave reflectarray antenna.
A method for underwater target recognition based on wavelet packet entropy and probability neural network is studied in this paper. Wavelet packet transform (WPT) is a time-frequency analysis tool which is developed from wavelet transform (WT). The low-frequency and high-frequency component of a non-stationary signal can be decomposed by WPT simultaneously. The radiated noise of an underwater target...
In this paper, we propose an improved model for image denoising, which combines the second-order ROF model and the fourth-order partial differential equations (PDE), and it is solved by the combination algorithm of the split Bregman method, an algebraic multigrid method and Krylov subspace acceleration. At the same time, we prove that the model is strictly convex and exists a unique global minimizer...
Human daily activity recognition has gained much attention since it has a wide range of applications. In this paper, we propose a novel scheme for recognizing human daily activity by fusing multiple wearable sensors, i.e., accelerometer and multi-lead ECG. Firstly, both time and frequency domain features are extracted from raw sensor data. In order to alleviate the computation complexity of subsequent...
In order to improve the weak signal detection performance of Unmanned Underwater Vehicle (UUV), depressing its self-generated noise and fully using the differences of incidence in space domain and differences in frequency domain (spectral patterns and spectral level) between signal and noise are two key issues. In practice, there are many measures besides ANC (adaptive noise cancellation) to enhance...
The passive coherent location (PCL) radar detects potential targets by computing the cross ambiguity function (CAF) between the target echo signal and the direct path wave, which is regarded as the reference signal received from the reference channel. However, a number of the multipath interferences present in the reference signal in most cases. The existence of the multipath interferences can increase...
This paper presents a consensus based traffic network management system. A consensus algorithm is used to control the traffic lights. The traffic lights can cooperatively manage the traffic flow among the whole traffic network. The system aims to average the traffic flow and force the road resources to reach maximum usage around the whole network. As a decentralized system, consensus based traffic...
Space-time joint processing using double-arrays for radiated noise measurement is investigated in this paper. Based on the theory of stochastic array measurement, double-arrays space-time associated model is established using statistical characteristic discrepancy between target signal and ocean environment noise. Taking one of the elements as reference, signal power was enhanced by packet processing...
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