调频

On the basis of analyzing the oscillatory frequency of crystal oscillator , the general expression of the frequency deviation of crystal frequency modulation oscillator is de rived .

本文在分析晶体调频振荡器振荡频率的基础上，得出了晶体调频振荡器频偏的一般表示式，最佳负载条件下的频偏设计公式和调制级有电流串联负反馈时的频偏设计关系式。

BCBBs are designed for not only symmetric linear arrays but also asymmetric linear arrays, are arrays and circle arrays. The BCBBs designed are tested by LFM signals, and the results show that the BCBBs achieve good quality. The word length of the filter efficients are studied from the view of engineering implementation. It is shown that using 8 bits can satisfy the requirement. Multi-beam BCBBs with 2 degree beamwidth in two octave and 1/3 octave frequency band are designed and tested for a specified array.

设计好的宽带恒定束宽波束形成器用线性调频信号进行了检验，证明了其正确性；从工程实际的角度出发，研究了滤波器系数字长对系统性能的影响，研究表明采用8位的滤波器可以满足要求；结合实际课题，在深入分析阵形结构特征的基础上，分别设计了倍频程和1/3倍频程多波束宽带恒定束宽波束形成器，并通过线性调频信号进行了验证，为其工程实现打下了良好的基础。

In this paper, for the first time, the impact of the noise frequency-modulated signal to a wide band linear frequency modulation matched filter is studied for different modulation noise variance and bandwidth.

研究了噪声调频信号中调制噪声方差及带宽的选择对宽带线性调频匹配滤波器的影响。

The UM2000 frequency shift signal is a multiple frequency-modulated signal, of which the frequency modulated constant is a key parameter.

UM2000移频信号是一个多频调制的调频信号，其中调频常数是一个关键的参数。

The received signal from target of linear frequency-modulated continues wave radar is a linear frequency-modulated signal.

线性调频连续波雷达对于匀速运动目标的回波经过混频以后还是一个线性调频信号。

The characteristics of recovery cycles in inferior collicular neurons of leaf-nosed bat and effect of the recovery cycle on the following pulse repetition rate were studied using mimic CF-FM sound stimuli emitted by free flying bat. 93 IC neurons were obtained from IC of five bats with normal hearing.

为探究恒频-调频蝙蝠下丘神经元恢复周期特点及其对声脉冲跟随率的影响，实验采用模拟的大蹄蝠自然状态下的恒频-调频发声信号为声刺激，在5只听力正常的大蹄蝠上记录了下丘神经元的声反应和恢复周期（n = 93）。

Level 1 FM screening is above the centary of the tartars'folk FM screening, use a fixed size of ideas and in different sizes space interval.

一级调频加网就是上面论述的纯正调频加网，使用固定尺寸的小点子和不同尺寸的空间间隔。

Combined with the Innovative Foundation Project in High Technological Development-Plan of Ministry of National Science and Technology (i.e. a research on passive localizing system based on a non-co-operative transmitter like as Television and FM broadcast), we investigated on signal detection and estimation methods in passive localizing system in detail.

结合科技部高技术发展计划创新基金项目——&基于电视、调频广播等非合作性照射源的无源探测定位系统&，作者对基于电视、调频广播信号的无源探测定位系统中的弱信号检测与参数估计算法进行了深入研究。

My radio is a portable set, too, but I get both AM and FM stations on it.

我的那台是便携式的，可收听调频AM和调频FM。

D dissertation. Based on GPS C/A code signal structure and performance characteristics, traits of aiming interference and jammer are analyzed. The best interference way is that wideband interference of uniform spectrum is made from wideband saw tooth frequency modulation and narrowband frequency modulation.

根据GPS的易受干扰的C/A码信号的特点，分析了对GPS的C/A码的瞄准式干扰、阻塞式干扰及相关干扰的特性，分析得知对GPS的C/A码的最佳干扰是锯齿宽带调频和噪声窄带调频相结合的均匀频谱宽带干扰。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。