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1)  PSK-2DSSS
PSK二次扩频
1.
The performance of the PSK-2DSSS system is analyzed in noise jamming.
本文首先介绍了直接序列扩频、m序列及Gold序列等二次扩频系统设计的关键技术,在直接序列扩频的基础上采用将m序列和Gold序列有机结合作为扩频码,实现了一种新型非编码、PSK调制的二次扩频系统的设计方案,并分析了PSK二次扩频系统的抗干扰能力。
2)  second expansion
二次扩张
1.
Gas second expansion theory of base bleed is a kind of approach which can increase efficiency of base bleed.
底排燃气二次扩张原理是进一步提高底排增程效率的新技术途径。
3)  two-dimensional spread spectrum
二维扩频
1.
Because of two-dimensional spread spectrum, the system can contain more users in the whole system.
该系统能更有效地利用传输带宽 ,实现频率分集 ,并且由于是二维扩频 ,所以该系统有更强的多址能力。
2.
two-dimensional spread spectrum technology.
简要介绍了两种典型的一维扩频技术,即DS-CDMA和MC-CDMA,在此基础上重点分析了一种新的扩频技术,即二维扩频技术。
3.
In this paper,we analyze the BER performance of pilot symbol assisted two-dimensional spread spectrum systems with coherent demodulation in multi-path fading channels.
在多径衰落信道中,本文分析了导引辅助的二维扩频相干解调的误码率性能。
4)  two dimensional spread spectrum
二维扩频
1.
The architecture of an M-ary two dimensional spread spectrum (M-2DSS) system which is motivated by combining two dimensional spread spectrum with M-ary spread spectrum is proposed.
本文基于广义二维扩频的方法,结合M-ary扩频方式,提出了一种M-ary广义二维扩频的方法,给出了该方法的发射机和接收机的工作原理。
2.
A novel differential detection method, called Two-Dimensional chip-level differential detection (2D-CLDD) is proposed, the chip-level differential detection is performed in both time domain and frequency domain in two dimensional spread spectrum system, and the channel s fading effect on both time domain and frequency domain can be decreased in 2D-CLDD.
本文提出了一种新颖的差分检测方案:二维码片级差分检测,和传统的差分检测方案不同,这个方案在二维扩频系统中,对时频二维实现码片级差分检测,可以在时频二维同时降低信道衰落带来的影响。
5)  secondary frequency regulation
二次调频
1.
This paper describes the relationship between the hydro-turbine governor and the grid load frequency control, analyzes the functions, the static and dynamic characteristics of the governor in grid primary and secondary frequency regulation.
文中叙述了水轮机调速器与电网负荷频率控制之间的关系,分析了调速器在电网一次调频、二次调频中的作用、静态特性和动态特性;通过建模、仿真及现场试验,提出了机组并联于大电网工况下的调速器PID参数整定范围和应有的机组功率控制模式。
2.
Through the software primary and secondary frequency regulation, the system complete the frequency regulation work in isolated power grid and guarantee the operation stabilization of the plant.
本文介绍了DEH系统功能原理,根据大连西咀热力有限公司孤网运行特点,采用软件一次调频和二次调频两种方式,成功地完成了孤网运行的调频任务,达到了稳定运行的目的。
6)  secondary mixing
二次混频
1.
A simple phase measurement technique of high resolution, the secondary mixing, is presented.
给出一种可用于纳米精度测量的二次混频测相技术,着重设计了其中的频率合成器。
2.
A combination method based on secondary mixing and MTD(Moving Target Detection)processing is proposed for high-speed targets detection in linear frequency-modulated continuous wave(LFMCW)radar.
针对LFMCW雷达高速运动目标的检测问题,本文提出了一种二次混频与MTD处理相结合的方法。
3.
The theory and scheme of the Doppler allowance extension using the method of secondary mixing were offered and validated by simulation.
在对伪码调相引信多普勒容限扩展必要性进行分析的基础上,研究了多普勒容限与引信主要参数间的关系,提出了用二次混频的方法扩展多普勒容限的理论和设计方案,并通过仿真进行了验证。
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