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The estimation of signal parameters is an important research field of modern signal processing. It finds wide applications in many fields, such as radar, communications, sonar, seismology, radio astronomy, biomedicine engineering, etc. So, its study is of great theoretical and practical value.

信号参数估计是现代信号处理领域内一个重要分支，它在雷达、通信、声纳、地质勘探、射电天文以及生物医学工程等众多领域有着广泛而重要的应用前景，因此对各种参数估计方法的研究有着重要的理论和应用价值。

Aircraft navigation system, one or more ground navigation station with the provisions of the frequency of launching radio beacon signal (amplitude wave, audio wave modulation or code), aircraft flight navigation equipment according to the received beacon signal measured or calculated aircraft Solutions relative to the navigation ...

飞机导航系统中，一个或几个地面导航台用规定的频率发射无线电信标信号（等幅波、音频调制波或代码），飞机机上导航设备根据收到的信标信号测出或解算出飞机相对于导航。。。

In order to measure the mould level more quickly and accurately, the algorithms for real-time signal processing are developed to determine the pulse count rate, filter the signal and to compensate the decay of the radioactive source automatically.

为提高测量的统计精度和快速性，设计了信号实时处理算法测量信号脉冲计数率，进行信号滤波和放射源衰减自动补偿。

The system can get the signal waveform parameters from the harmonic components of radius vector deviation, plot a curve of interpolation error by delivering magnified moiré fringe photoelectric signal to computer with digital acquisition board.

该系统可以利用数据采集卡，将放大后的莫尔条纹光电信号送入计算机，由向径偏差的谐波成分得到信号波形参数，绘出细分误差曲线。

The whole retrieval process was composed of random segment retrieval and total matching: the first was to select a segment from template model as object to retrieve in stored signal and the second was to judge whether the potential object signal was the template model based on random segment.

把整个检索过程分成随机段检索和整体匹配两个阶段：随机段检索是从参考模板中随机选择一段作为检索目标进行检索；整体匹配是在随机段检索出的基础上，判断潜在目标信号是否为参考模板。

Signal to Noise Ratio: The ratio of the signal to the random noise in a set of data.

信噪比：平均到一个数据单元的信号与随机噪声的比值。

Time-Dependent Fourier Transform was used for the reason of the light signal is random signal.

根据光信号的随机特性，确定了信号的分析方法：短时Fourier变换。

The design, analysis and calculation of instrument machine structure, the circuit of infrared emission and receival, the design of direction detection and signal processing circuit, the oil level signal collection, processing, and display are finished in mis article.

本文重点完成了磁式光纤液位探测器机械结构的设计、分析和计算，红外光发射与接收电路、倍频辨向电路和信号调理电路的设计，以及液位信号的采集、处理和显示的设计。

The size of the diplexer was 18.3mm×15.6mm×0.5mm, at the frequency of 1.87GHz and 2.34GHz, the decay was higher than 55dB, so it suppressed the local oscillator signal and its mage reconstructor tube signal effectively, which met the design of filter with miniaturization. And then the three-dimensional laminated structures were used to realize the design of miniaturization, which was good for the later research.

该双工器尺寸为18.3mm×15.6mm×0.5mm，在频率1.87GHz和2.34GHz处衰减大于55dB，有效的抑制了阻带上的本振信号及其镜像信号，达到了设计指标，并利用三维叠层结构实现了小型化的目的，为以后的工程设计提供了有益的探索。

The proportional reducing valve changes the electric signal into a hydraulic signal.

比例减少的阀门改变电信号到一个水力信号。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。