Direct Digital Synthesizer (DDS) has the advantages of high frequency resolution, rapid frequency change rate and low phase noise.
直接数字频率合成器dds具有极高的分辨率、频率转换速度快、相位噪声低等优点。
Derection and power spectrum of an incident plane wave are estimated by evaluating amplitude and rate of phase change of the corresponding sinusoidal wave.
从相应正弦波求得的振幅和相位变化率可以检测平面波的入射方向和功率谱。
The relation of bubble nucleation rate and degree of superheat, and phase change driving force and phenomenological coefficient, were analyzed based on phenomenological theory, respectively.
基于唯象理论，分析了汽泡核化速率和过热度以及相变驱动力和唯象系数的关系。
DDS has both the advantages of high frequency resolution, rapid frequency change rate and low phase noise and the disadvantage of bad spur suppression performance with Max value of -65 dB.
DDS的优点是具有极高的分辨率、频率转换速率快、相位噪声低等；缺点是杂散度抑制比性能差，很难做到- 65d B。
Technology of passive location has broad prospects for application. The single observer-passive location method of phase difference rate of change is introduced based on existing methods.
无源定位技术有着广阔的应用前景，文中在现有单站无源定位方法的基础上，介绍了相位差变化率定位法。
The surfaces of all the phase change energy storage ceramsites were intact after 100 cycles of phase change, and the loss rate of the mass of phase change materials were below 5%.
经过100次相变循环试验，表明相变储能陶粒表面保持完好，相变材料的质量损失率均在5%以下。
In chapter 2, the basic principle and observability for target location utilizing phase difference rate-of-change and Doppler rate-of-change information of emitter is discussed.
论文第二章介绍了利用相位差变化率和多普勒变化率的定位原理，并且通过系统可观测性分析证明了其与角度信息联合利用跟踪目标的可行性。
Therefor, a single observer passive location method was proposed by using direction of arrival, phase difference rate-of-change, frequency and Doppler frequency rate-of-change in this paper.
为此，提出一种利用空频域信息的固定单站无源探测定位方法，利用波达方向、相位差变化率、载波频率及多普勒频率变化率实现对运动目标的无源定位。
This topic research is a single-station passive location technology which uses phase difference change rate of the non-cooperation radiant signal to ascertain the target's location.
本课题的主要研究内容就：是如何利用非合作辐射源对运动目标进行无源定位。
This topic research is a single-station passive location technology which uses phase difference change rate of the non-cooperation radiant signal to ascertain the target's location.
本课题的主要研究内容就：是如何利用非合作辐射源对运动目标进行无源定位。
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