3) coherent detection
相干检波
1.
Extraction of the In-pulse Characteristics of Signal Based on Direct Sampling from IF signal and quadrature coherent detection;
基于中频直接采样正交相干检波技术的信号脉内特征提取
2.
According to the principle of IF signal sampling and quadrature coherent detection, the scheme sampling the 30 MHz radar IF signal (Bandwidth= 2MHz) directly is presented.
依据中频信号采样与正交相干检波的基本原理，提出了直接对３０ＭＨｚ的雷达中频信号（带宽２ＭＨｚ） 进行采样来实现正交相干检波的方案，给出了计算机定点仿真及硬件实现结果。
3.
This paper discusses how to implement the direct sampling of radar IF signal with high speed A/D converter and how to resolve one channel of digital signal into two orthogonal digital signals by Bessel interpolation or low pass filtering to realize a digital coherent detection,presents the implementation program based on high speed AD6640 and complex programmable logic device.
讨论了如何利用高速模/数(A/D)变换器实现对雷达中频信号直接采样,如何通过Bessel插值或低通滤波将1路数字信号分解为2路正交数字信号以实现数字相干检波,给出了基于高速 AD6640 及复杂可编程逻辑器件的实现方案。
4) multicarrier coherent modulation
多载波相干调制
5) coherent detection
相干检波;相干解调;相干检测
6) modulated returns
调制回波
1.
This article makes a simulation analysis of the ideal modulated returns under the four conditions of various attitude angles, the number of rotating blades, the rotation speed and the various radar wavelength, which shows that the periodical modulation features are relatively stable and can be available for the identification of aircraft targets.
本文在不同的姿态角、不同的旋转桨的个数、不同的旋转速度和不同的雷达波长四种条件下,对飞机旋转部件的理想调制回波进行了仿真分析。
补充资料：相干散射和非相干散射
再辐射的光量子频率和被吸收的光量子频率准确相等的散射过程称为相干散射。在相干散射的情况下，源函数准确地等于平均辐射强度。再辐射的光量子频率和被吸收的光量子频率不相等的散射过程称为非相干散射。在天体物理中，存在一系列因素使散射过程成为非相干散射。主要的因素是：原子的能级有一定的宽度、原子的热运动和湍动以及压力效应等。对于非相干散射，源函数是相当复杂的。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条