调频

The 3 to 4-m thick sands of the Ryugasaki Fm constitute the upper aquifer in the area.

1.3至4米厚的砂的龙崎调频构成上含水层在该地区。

Then using the character scale vector the arithmetician for model identification aiming separately at LFM and FH signals are proposed.

本文分别针对线性调频信号和跳频编码信号提出了辨识信号模型的算法，进行了计算机仿真。

The major difference between these two schemes is that a phase modulator has a 6 dB per octave rising audio response (i.e. pre-emphasis is inherent in PM systems with no added circuitry).

调频和调相的主要区别是：相位调制有一个6dB/OCT的上升音频响应（也就是，预加重是调相的内在特性，不需要加另外的电路

It locks the frequency of the carrier-wave at 35MHz.The stabilization of the carrier-wave can be 4×10-5,the accuracy can be 3×10-5.The frequency modulation and the confection of the carrier-wave are realized by the capacity-changing diode V149 and the integration voltage-control oscillator MC1648 chip.The end power amplifier uses the audion 2SC1970 to make it work in the third magnifying state,it improves the efficiency of the magnifier and the power of the output reaches the design demand.

发射部分采用锁相环式频率合成器技术， MC145152和MC12022芯片组成锁相环，将载波频率精确锁定在35MHz，输出载波的稳定度达到4×10-5，准确度达到3×10-5，由变容二极管V149和集成压控振荡器芯片MC1648实现对载波的调频调制；末级功放选用三极管2SC1970，使其工作在丙类放大状态，提高了放大器的效率，输出功率达到设计要求。

The transmit part adopts the phase-locked loop pattern of frequency synthesizing technology and uses the MC145152 and MC12022 chips to compose the phase-locked loop.It locks the frequency of the carrier-wave at 35MHz.The stabilization of the carrier-wave can be 4×10-5,the accuracy can be 3×10-5.The frequency modulation and the confection of the carrier-wave are realized by the capacity-changing diode V149 and the integration voltage-control oscillator MC1648 chip.The end power amplifier uses the audion 2SC1970 to make it work in the third magnifying state,it improves the efficiency of the magnifier and the power of the output reaches the design demand.

发射部分采用锁相环式频率合成器技术， MC145152和MC12022芯片组成锁相环，将载波频率精确锁定在35MHz，输出载波的稳定度达到4×10-5，准确度达到3×10-5，由变容二极管V149和集成压控振荡器芯片MC1648实现对载波的调频调制；末级功放选用三极管2SC1970，使其工作在丙类放大状态，提高了放大器的效率，输出功率达到设计要求。

Based on the theory of phrase staying and the autocorrelation function, we design better performance nonlinear frequency modulation pulse compression radar.

基于逗留相位原理以及信号的自相关函数，设计了一种性能十分优越的非线性调频脉冲压缩雷达体制。

Synthetic aperture radar; frequency modulated continuous wave; ultra-high resolution ; motion compensation ; back projection algorithm

合成孔径雷达；调频连续波；超高分辨率；运动补偿；逆投影算法

Based on the beat signal modelling, the frequency modulation soure nonlinearities affecting the radar range resolution are also discussed.

本文的主要创新之处在于：（1）总结了三毫米线性调频连续波雷达的关键技术，提出了实现这些技术的有效方法。

Beneath the external display one can find the keys to control the music player and FM Radio.

下方外部显示器之一，可以找到钥匙，以控制音乐播放器及调频收音机。

It has a Wide and Narrow bandwidth selector with a series of ceramic bandpass filters, a DX/Local switch and an FM noise canceler switch.

天气让与一系列陶器的带通滤波器一起的一台宽和精细的带宽选择器，一DX/Local接通和一个调频噪声消除器开关。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。