First, author studies oppressive jamming technology of SAR based on its system gain, analyses its fundamental theory and jamming mechanism, programs an integral simulation software which produces noise data of several kinds, at the same time carries out many simulation experiments under different noise-to-signal ratio of each noise type, then makes in-depth analysis and comparison on those images resulting from simulation experiments and summarizes some conclusions of theoretical and practical value.

The principle of the Cross-correlation-coefficient algorithm and the absolute difference algorithm are introduced,all kinds of different noise type of CCD apparatus are analyzed.

The comparison experiments of speech signals corresponding to different SNR and noise type was designed using the measure of complexity behaviors based on the information gain.

The simple principle of Contact Image Sensor (CIS) and the noise types existed in CIS are introduced. The theory of suppressing these noise types for CIS by using Correlated Double Sampling(CDS) is described,and the timing relationship between driving signals CP/SP that CIS required and sampling-holding signals SH1/SH2 are also analyzed,these signals are produced by using Complex Programmable Logic Device(CPLD).

Employing a two stage filtering system,the method not only has a character of small amount of computations and high stability, but also has no strict limitations to the geometric structure of the microphone array and even to the noise types.

The simulation results show that this wavelet decomposition based method is available not only in the DFH signal existence detection, but also in the noise jamming power estimation and the noise sorting.

The influence of fluctuation disturbances of the white noise type on spectral-correlation characteristics of the oscillations is investigated.

On the Phase Portrait of a Harmonic Oscillator with Friction Perturbed by a Random Process of White Noise Type

We study the phase portrait of a harmonic oscillator with friction for the case in which random perturbations of white noise type expressed in the It? form act at a certain angle to the phase velocity vector.

The frequencies are calculated by solving a set of stochastic Langevin differential equations with a thermal bath of the white-noise type.

The destabilizing effect of parametric random perturbations of white noise type in certain quasilinear continuous dynamic system

The uncertainty in the determination of the time integral of analytical signals due to base-line noise is calculated for specified noise types of frequent occurrence.

A comparative study of the proposed technique for real-world noise types demonstrates a significant performance gain compared to the baseline speech features and to the spectral subtraction enhancement method.

We study the errors of LS, TLS, equilibrated TLS and GTLS algorithms with different noise types and varying intensity and correlation levels.

Addition of various noise types makes the microarray highly peaked with high pixel differences.

By theory and simulation we have computed its mean, variance, and empirical probability distribution in the presence of the three FM noise types.

The Jiyuan depression is the hydrocarbon-bearing area discovered eariiest in North China.Terribly complicated seismic-geological con- dition and very heavy multitudinous noises result in very low signal /noise ratio of seismic data in this area,which severely obstructed hydrocarbon exploration in this area.Hence,research of seismic me- thods for this area has been made systematically.Reasonable seismic data acquisition parameters were determined by making detailed surface -layer analysis and overall field tests,and...

The Jiyuan depression is the hydrocarbon-bearing area discovered eariiest in North China.Terribly complicated seismic-geological con- dition and very heavy multitudinous noises result in very low signal /noise ratio of seismic data in this area,which severely obstructed hydrocarbon exploration in this area.Hence,research of seismic me- thods for this area has been made systematically.Reasonable seismic data acquisition parameters were determined by making detailed surface -layer analysis and overall field tests,and by designing expert system with the use of spectral analysis data and field operation data.Conse- quently,special field method(including deep shot hole,big array leng- th,high stacking fold and high low-cut filtering)was adopted to imp- rove raw seismic data obviouslyo Furthermore,good static correction, correct stack velocity and reasonable prestack two-dimensional filtering were used to remove seismic noise in data processing.The above me- thods can improve signal/noise ratio and result in qualified seismic data which favour structural and lithologic interpretations.

The method for obtaining unbiased estimates of the transfer function depends on the type of noise presenting in the various time series. The robust least squares(LS) single source method can be used when there is uncorrelated electric noise but requires noise free magnetic time series, or vice versa. The robust remote reference method can also be used when there is uncorrelated noise both in the electric and in the magnetic time series. While there is not any method being able to obtain unbiased estimates of...

The method for obtaining unbiased estimates of the transfer function depends on the type of noise presenting in the various time series. The robust least squares(LS) single source method can be used when there is uncorrelated electric noise but requires noise free magnetic time series, or vice versa. The robust remote reference method can also be used when there is uncorrelated noise both in the electric and in the magnetic time series. While there is not any method being able to obtain unbiased estimates of the transfer function when there is stronger correlated noise both in the electric and in the magnetic time series. The history of magnetotelluric method is firstly reviewed, and then the methods for estimation of response function in frequency or time domain, including those were widely used or tested numerically, are introduced and discussed. Some advances for estimation of response function are concluded at last.

Alot of noises accumulate on the upstream channel in HFC (Hybrid Fiber-Coax)system ,which caused the difficulty in bi directional operations, Therefore,suppressing them is very difficult. The paper analyzed the sorts of noises ,the methods of suppressing and several mutil user access techniques on the upstream channel in HFC system, and put forward the asynchronous CDMA system which is practical in our country, Meanwhile,the paper the nolinear filter method to modify those techniques. The filter structure...

Alot of noises accumulate on the upstream channel in HFC (Hybrid Fiber-Coax)system ,which caused the difficulty in bi directional operations, Therefore,suppressing them is very difficult. The paper analyzed the sorts of noises ,the methods of suppressing and several mutil user access techniques on the upstream channel in HFC system, and put forward the asynchronous CDMA system which is practical in our country, Meanwhile,the paper the nolinear filter method to modify those techniques. The filter structure is presented and its performance is analyzed simply, which increased the ability of resistance the noise and the capacity of the upstream channel.