Linear frequency modulation continuous wave ( lfmcw ) signal , which is used to measure the height of earth surface , is widely used in other applications 线性调频连续波( lfmcw )信号过去主要用于测量地表高度,现在又在其他方面得到了应用。
Via theoretical analyzing , we can find that the step reference waveform modulation strategy is an ideal one when frequency modulation ratio is not very high 通过理论分析，可以看出阶梯波调制pwm的确是在频率调制比不高时较好的调制方式。
Two kinds of typical wideband signal , frequency modulation ( fm ) signal and frequency spread signal , is analyzed qualitatively with wideband ambiguity function 以宽带模糊度函数为工具定性地分析了两类典型宽带信号，即调频信号和频率分集信号。
First , set up the reception antenna of satellites ; second , in c frequency band of the third satellite ( the safe health 3 ) in thailand ; third , frequency modulation 3425mhz 一、设置卫星接收天线；二、在泰国第三卫星（泰康3 ）的c频段；三、调频3425mhz 。
Information technology - data interchange on 90mm flexible disk cartridges using modified frequency modulation recording at 31 831 ftprad on 80 tracks on each side - iso type 303 信息技术.数据交换用90mm改进调制记录的31831ftprad每面80磁道的盒式软盘. iso类型303
Transmitter , receiver and ground communication equipment used in domestic satellite communication earth stations - technical requirements - part 3 : equipment for television frequency modulation 国内卫星通信地球站发射接收和地面通信设备技术要求第3部分:电视调频设备
( 4 ) the frequency modulation effects of positive dipole ( unipole ) forcing source on lfo is stronger than negative dipole ( unipole ) , and the wave oscillation quicken evidently ( 4 )正偶(单)极强迫源对大气低频振荡的调制作用强于负偶(单)极，波动振荡明显加快。
Based on the ti company ' s tms320f240 dsp , this paper designs a novel speed - sensorless system for frequency modulation with a new method of speed estimation 本课题以ti公司的tms320f240型dsp为平台，用一种新的速度估算方法，构成了一种新型的无速度传感器变频调速系统。
The task of this project is to design a hardware platform for radar video simulation and calculate the pulse - compression video signal of linear frequency modulation ( lfm ) radar system 本课题的主要任务是是设计雷达视频模拟平台并产生线性调频脉冲的视频目标模拟信号。
Information technology - data interchange on 90mm flexible disk cartridges using modified frequency modulation recording at 31 831 ftprad on 80 tracks on each side - gb type 303 信息技术数据交换用90mm改进调频制记录的位密度为31831磁通翻转弧度每面80磁道的软磁盘gb 303型
