It is proved by numerically simulation that the disturbing method can still obtain fairly good noise reduction results even if the signal - to - noise ratio of input signals is low . 3 （ z ，又， … ， 、几实验表明，梯度微扰法在低信噪比时仍然能够得到很好的降噪效果。
The theory research on the detection and estimation chip rate and period of pn sequence in low signal to noise ratios ( snr ) are accomplished in order to put it into realization 本文以工程应用为目的,对低信噪比情况下直扩信号的检测和pn码速率和码周期估计进行了理论研究。
The new method and original bayesian method are compared with the other two methods in the aspects like angular resolution ability , performance in low snr 新方法不仅具有很高的分辨能力，而且在低信噪比时也具有西北工业大学硕士学位论文摘要比mle和music更加优越的估计性能。
To cope with complex geology and low s / n data , it will be the focus of research to improve the computation precision and efficiency of velocity analysis at present and in the future 在复杂地质构造及低信噪比资料情况下，提高速度分析的精度和计算效率是当前及未来研究的重点。
The statistical performance of the joint estimation method is discussed based on the simulation , and the results show the good performance of the method at low snr . 4 研究了低信噪比情况下利用时频分析方法进行时延和多普勒频移联合估计的性能，表明联合估计方法的统计性能良好。
This algorithm can capture and trace the signal with the frequency shift larger than the symbol rate under low e ( subscript b ) / n0 when combining with proper frequency trace algorithm 该算法结合相应的频率跟踪算法能够在低信噪比条件下实现多普勒频移远大于符号速率的信号捕获与跟踪。
The influence of movement on the profile is studied , cyclostationary theory is used to estimate the movement parameters of the moving targets under low s / n environment 研究了运动条件对目标距离维高分辨成像的影响，针对低信噪比环境，提出利用循环平稳方法对运动参数进行估计的方法。
Experiment results show that the methods in this paper represent immensity efficiency and superiority . especially , this method is high performance in middle and low signal to noise ratio 通过大量实验计算表明，本文提出的算法具有良好的有效性和优越性，尤其在中低信噪比时表现更佳。
In the paper the methods to process weak echo by using dsp technology based on low snr of laser weak echo are presented . and the methods are simulated and calculated 摘要文章针对激光弱小回波信号的低信噪比，提出了运用数字信号处理技术对回波信号进行处理的方法，并进行了一系列仿真和计算。
With the conditions of constant false - alarm probability and low signal - to - noise ratio , the signal - to - noise ratio can be improved by reducing the effects of background interference and random noise 在恒虚警概率条件下，该算法可以在低信噪比的情况下，减小背景干扰和随机噪声的影响，提高信噪比。
