LFM

Mixed LFM Signal Detection Based on Independent Component Analysis

基于独立成分分析的混合LFM信号检测

With the LFM pulse frame synchronization method, the performance of UWA communication system based on DPSK is apparently improved.

同时运用线性调频脉冲帧同步法，改善了基于差分相移键控的水声数字通信系统的性能。

LFM-Costas stepped frequency radar ( SFR ) signal is an important radar signal.

线性调频 Costas 频率步进雷达信号是一种很有研究价值的雷达信号.

The beat signal model of the stationary, uniform motion and accelerated motion target is sinusoid, Linear Frequency-Modulated ( LFM) signal and polynomial-phase signal ( PPS) respectively.

静止、匀速运动和加速运动三类目标分别对应着正弦信号、线性调频（LFM）信号和多项式相位信号（PPS）三种差频信号模型。

The detection problems of single-component linear frequency modulation ( LFM) signal are studied.

研究了单分量线性调频（LFM）信号的检测问题。

Linear frequency-modulated continuous wave synthetic aperture radar ( LFM CW SAR) imaging algorithm is studied.

研究了线性调频连续波SAR的距离徙动算法成像。

Based on the theory of the matched filter, the bandwidth-duration product of the signal can be made greater than one, by the way of using the pulse width to add to the method of LFM signal band.

在匹配滤波器理论基础上，使用在宽脉冲内附加线性调频的方法可以扩展信号的频带，使信号的时宽带宽积大于一。

LFM can be demodulated by the same arithmetic as for FM, and the demodulated signal takes on the shape of saw-tooth-wave and the period of LFM can be estimated while modulation slope can't because of arctan operation.

LFM信号可以用实现FM的方法来进行解调，解调信号呈锯齿状，可以从中获得调制信号周期，但是因算法中存在反正切运算，致使无法从中获得LFM的调制斜率。

The main work and achievements of this dissertation are as follows: 1. Detecting the single-component and multi-component LFM signals based on FRFT.

本文的主要工作和成果如下：1.将FRFT应用于单分量及多分量LFM信号的检测中。

Hough transform is a usual method for the image edge detection. It has been used in the underwater acoustic field for estimation combined with time-frequency analysis, exemplified by estimate the frequency slope of the LFM signal with wigner-Hough transform.

Hough变换是一种用于边缘检测的图像处理手段，在水声信号处理中已被用来与时频分析手段联合起来对信号进行估计，例如Wigner-Hough变换利用对直线的Hough变换来估计线性调频信号斜率等。

A new kind of bilinear time-frequency distribution-adaptive Gaussian-kernel distribution ( AGD) is proposed according to multi-component linear frequency-modulated ( LFM) signals, and a new efficient kernel estimation method is presented.

该文针对多分量线性调频信号，提出了一种新的自适应核时频分布-自适应高斯核分布，并给出了有效的核函数估计准则；

The time-delay estimator of complex LFM based on cyclic cross-correlation amplitude is discussed.

研究了复线性调频信号的循环 互相关 估计时延问题.

The contribution of curriculum development funds in 1997 by LFM is gratefully acknowledged.

感谢1997年LFM提供的全校课程发展基金的贡献.

Based on the features of ambiguity function of LFM signal, a new adaptive kernel is given.

然后,基于线性调频信号模糊度函数特征, 提出了一种新的自适应核函数.

LFM signal will likely become the main signal form in underwater target strength broadband test.

线性调频信号可能将成为水下目标强度宽带测试的一种主要信号形式.

Joint Estimation of Doppler and Multipath Time Delay of Overlapping Echoes for LFM Pulse Radar

LFM脉冲雷达回波Doppler与多径时延的联合估计

LFM Fuze launch the same range of frequency modulation continuous wave signal, and use the substract frequency of the emission signal and the return siganl to determine the distance between the shells with the target.

调频无线电引信发射调频等幅连续波信号，其发射信号的频率按调制信号规律变化，利用回波信号与发射信号的频率差确定弹与目标间的距离。

Multi-Component LFM Interference Suppression Based on DCFT and FRFT in DSSS Communication System

DSSS中基于DCFT和FRFT的多分量LFM干扰抑制方法

Linear frequency modulation ( LFM ) interferences may be a kind of preferred wideband interferences in spread-spectrum.

线性调频 ( LFM ) 是扩频系统中常见的一种宽带干扰样式.

Based on the discussion on LFM signal, this paper studies several jamming methods and presents the simulation experiments, including: directed noise amplify jamming, phase modulation jamming, time-delayed jamming, frequency-shift jamming, etc.

在分析线性调频（LFM）信号的基础上，研究了多种基于DRFM的雷达干扰技术，仿真验证了干扰效果，包括：射频噪声干扰、噪声调相干扰、延时干扰和移频干扰等。

The problem of LFM pulsed radar's ranging bias due to the range-Doppler coupling is studied.

研究了线性调频(LFM) 脉冲体制雷达由于距离 - 多普勒耦合效应造成的测距偏差问题.

Suppression of Time-varying Amplitude LFM Interference in DSSS Communication

直扩通信中时变幅度LFM干扰的抑制

Then, use the gotten LFM rate to remove the signal's LFM. And then apply FFF to the signal whose LFM was removed to get the original frequency of each component.

然后利用识别出的线性调频率对信号进行解线调，再对解线调后的信号进行FFT来识别每个LFM信号分量的初始频率。

The instantaneous frequency estimation problems of single-component LFM signal are studied.

研究了单分量LFM信号的瞬时频率估计问题。

By using two steps search method to detect single-component LFM signal in order to obtain a clear detection result and reduce the computational cost.

在单分量LFM信号检测中，为获得明显的检测效果及减少搜索过程的计算量，采用了两级搜索的方法。

Moreover, a new method combining Radon-Gabor transform with "clean" technique for multicomponent LFM signal detection and parameter estimation is presented.

然后阐述了用Radon Gabor变换对LFM信号进行检测和参数估计的基本原理，并结合逐次消去（Clean）技术提出了基于Radon Gabor变换的多分量LFM信号检测和参数估计实用算法。

Then, according to the mathmatical description to UWB impulse response in literatures, three kinds of UWB signal modeling are studied, such as LFM 、 impulse 、 carrier-free coded waveforms, supposing the target scattering center distribution is given.

根据文献对UWB雷达目标冲击响应的数学近似描述，在目标散射中心分布设定的条件下，研究了线性调频、相位编码和冲击脉冲三类常用超宽带雷达信号的目标回波建模。

A algorithm for DOA estimation of coherent wideband LFM signals based on the FRFT using uniform circular array ( UCA) is proposed.

本文给出FRF域基于均匀圆阵的宽带相干LFM信号波达方向估计算法。

The simulation results show that they are effective methods in jamming LFM radar.

分析及仿真结果表明:由于DRFM技术的引入,这些干扰都可以对LFM信号形成有效干扰.

Performance Analysis of Parameter Estimation Algorithm for LFM Signals using Quadratic Phase Function

基于QPF的LFM信号参数估计算法性能分析