The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
On-orbit single event effect error rate is predicted combining accelerated radiation test and space radiation environment model for a FPGA-based signal processing platform. With partial TMR and reconfiguration mitigation method, there is no single event latch is observed when the surface linear energy transfer of heavy ion is 99.8 MeV.cm2/mg, and the error/SEU ratio is 4.7431e-004. Error rate of four...
To evaluate the total ionizing dose vulnerability of spaceborne signal processing platform, an accelerated radiation experiment is set up and on-orbit prediction method is proposed. For signal processing platform which consists of SRAM-based FPGA and DSP, function parameter and current variety are the two criterion of experiment. 60Co γ radial radiation experiment indicates that total dose is about...
Time and frequency synchronization is prerequisite of coordinating multi-static radar system. However, available synchronization methods do not provide practical beyond line-of-sight synchronization especially under the condition of maneuver. Therefore, a novel time and frequency synchronization mechanism based on troposcatter has been proposed. And the main motivations of this paper are to analyze...
Distance information is useful for satellite constellation. Evaluating the accuracy of spread spectrum receiver under finite bandwidth is still hard and few researches focus on that. In this paper, we build the signal model of DSSS signal under finite bandwidth, and then derive the mathematic form of error function. Furthermore, we propose the error factor, which is decided by bandwidth and early-to-late...
A coherent Hough method is proposed here to integrate the pulse-train signal. Based on a narrowband echo model, the suggested method implements the coherent integration by compensating the modulated phase terms from pulse to pulse before applying Hough transform. The improved method outperforms standard Hough transform, particularly in a very low SNR environment. The algorithm's performance is analyzed...
Due to its advantageous features (eye protection, low energy consumption and capability of being read under any lighting-conditions), Electrophoretic displays (EPD) have been rapidly developed in the past ten years. Different types or production batches of EPD films need different driving waveforms; even in the same device, different driving waveforms are required under different environments to guarantee...
This paper introduces the Extended Kalman Filter (EKF) to realize high dynamic tracking of GPS signal. It's compared with the traditional tracking loop with a third-order phase-locked loop (PLL), which is assisted by a second-order frequency-locked loop (FLL) and a second-order delay-locked loop (DLL). It can estimate carrier phase, Doppler shift, rate of change of Doppler shift and code phase in...
Time-hopping signal structure is adopted for overcoming the near-far problem in the Ground-based Navigation System. The signal model of TH-CDMA signal is presented. To track the pulse signals with pseudorandom active-timeslot, tracking loops with time-varying sampling periods are designed. The linear model of the second order TVSP-PLL is presented. The stability of the time-varying model is analyzed...
Echo hiding algorithm is a type of Information hiding technology which has been widely used. This paper introduces the principle and the mathematical model of echo hiding algorithm. Generally, the traditional echo hiding algorithm just allows to hide 180 bits of information in 1 second, in order to increase the hiding capacity, we proposed multiple delayed position of echo hiding algorithm. It permits...
The paper presents a maximum likelihood symbol detection scheme with the assistance of a two-stage-ranking mechanism for massive MIMO systems. The proposed scheme first computes the QR decomposition to the channel matrix in order to obtain them corresponding unitary and upper triangular matrices. Next, the ML mechanism is conducted to recursively estimate the transmitted symbols layer by layer. In...
Traffic flow detection is an important topic in intelligent transportation systems (ITS). At present, most of the traffic flow detection method for nighttime are based on the headlights. However, headlights are not available in bad weather while the vehicle taillights have more stable features such as colors. so that in this paper, a novel method based on vehicle rear lamp and virtual coil is presented...
We propose a high capacity reversible ternary embedding-watermarking algorithm based on a modification of full-context-prediction-errors (MFCPE) wherein the binary bit stream is converted to the ternary stream then error histogram shifting is utilized to embed the ternary stream. Unlike the existing predictor methods, we provide a full context prediction with a modification of each pixel at most by...
Discrete wavelet transform of finite-length signals must necessarily handle the signal boundaries. The state-of-the-art approaches treat such boundaries in a complicated and inflexible way, using special prolog or epilog phases. This holds true in particular for images decomposed into a number of scales, exemplary in JPEG 2000 coding system. In this paper, the state-of-the-art approaches are extended...
Optical Character Recognition (OCR) is an important area of pattern recognition. Automatic OCR system is one kind of intelligent system which is very important to the current automation systems such as ATMs. In this paper, a RMB OCR (ROCR) system is implemented using FPGA, which consists of Character Segmentation (CS) module and OCR module. The CME M7 was used for the implementation. 83.30% Logic...
In conventional speech enhancement algorithms, the most used technique for noise suppression is the attenuating filter, mainly because that the sign or phase of the clean speech and noise coefficients are assumed to be coincident. However, the amplitude of the noisy speech coefficient may not always be bigger than that of the clean speech in fact. Considering the two stats of noise signals in DCT...
Radar signal simulation technology plays an important role in the development, performance and evaluation testing stage of modern radar systems. This paper focuses on the design principles and hardware components of a wideband radar signal simulator based on high-speed DDS technology and Compact PCI bus. The result of joint commissioning between computer software and hardware system shows that this...
When the nonuniform pulse-train signal is applied to the problem of weak target detection, the traditional long-time integration methods based on FFT are no longer valid. A novel method based on Keystone transform and nonuniform FFT is proposed here to accumulate the echo energy, wherein the former is employed to remove the range walk and the latter realizes the coherent integration of nonuniform...
Existing decision-level information fusion methods for weak electrophysiological signals detection cannot effectively integrate conflicting information. Meanwhile, data-level information fusion methods lose physiological significance of channels. In this study, the evidence on each channel with a soft-decision method is first proposed. Then, a general multi-channel flexible information fusion detection...
Each year more and more people are diagnosed with Diabetes Mellitus. As this disease continues to grow, it will have an enormous effect on society. Recently, a computerized noninvasive diagnostic method was proposed using facial block color features with a sparse representation classifier. This method eliminated the need to extract bodily fluids, and any feelings of pain and discomfort associated...
The existing study and application of Prolate Spheroidal Wave Function (PSWF) primarily around the characteristics of PSWF in a single energy domain, the characteristics of PSWF in two-dimensional time-frequency energy domain have not been mining and using, from the perspective of signal time-frequency distribution, Wigner-Ville Distribution with higher time-frequency resolution was introduced to...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.