step frequency

Crowd excitation is simulated by random method according to normal footfall force curve and other individual factors such as distribution of crowd, step frequency and physiological characteristics.

根据单步落足曲线，结合影响人群行走效应的因素如人群分布、行走频率及个体生理特征等，采用随机方法模拟人群行走激励。

Operating in the heavy congested SW band, HF radars use a quasi-random step frequency signal to avoid the interference bands.

高频雷达工作在电磁环境十分恶劣的短波段，为避开干扰严重的频段，采用一种准随机跳频信号。

The Effects of Step Frequency and Conical-scan Antenna on the Target Echo Wave Signal

频率步进圆锥扫描体制天线对目标回波信号的影响

According to the test result of frequency response characteristic of the excitation system without PSS the parameters of the PSS are set and both step response test of the load and mis-reverse adjustment test for the excitation system after the setting are carried out.

根据无PSS时的励磁系统频率响应特性试验结果对PSS的参数进行了整定，并对整定后的系统进行了负载阶跃和反调试验。

A Adjusting Voltage Step Motor Driving Circuit by Dividing Frequency Used in NC Machine Tool

用于数控机床的分频段调压步进电机驱动电路

This paper mainly introduces the computation of time interval of pulse delay in the design of pulse positioning of rise and fall frequency of step motor with microcomputer control.

主要介绍微机控制步进电机升降频脉冲定位设计中，脉冲间隔时间的计算方法。

Meanwhile, various receiver modules are designed respectively to accept step frequency signal, and their properties are simulated, such as receiver bandwidth, VSWR and so on.

然后分别设计了实现接收步进频率信号的接收机的各个模块，并仿真了它们的性能，如接收机带宽、驻波比等。

The indexes for approximation evaluation include the step response, the rising time, Bode plot, the band width, and the H-inf norm of the error over the whole frequency range.

比较指标有单位阶跃响应的上升时间、频域波特图的频率带宽、以及传递函数误差的H-inf范数。

Processing of conical scan step frequency radar signal

步进频率圆锥扫描雷达信号处理

A New Fast-time Doppler Effect Compensation Method Applied to Step Frequency SAR System

步进频率SAR快时间多普勒效应补偿新方法

This paper summarizes the characteristics of the wavelength phase-shifting interferometry and divides the step measurement algorithms of wavelength phase-shifting interferometry into temporal domain and frequency domain algorithms.

概括了波长移相干涉技术的特点，将基于波长移相干涉技术的台阶测量算法分成两类：时域算法和频域算法。