| 1. | The arithmetic formulas for sine wave , linear frequency modulation signal , v - style frequency modulation signal , white noise signal , reverberation signal and echo signal are given by their definition
根据信号类型的定义,给出了正弦信号、线性调频信号、 v型调频信号、白噪声、混响和回波信号的合成公式。 |
| 2. | Briefly , here are main topics of this dissertation : ( 1 ) the relation between the resolving power of the linear frequency modulated continuous wave radar and the linearity of linear frequency modulation signal
同样，输出数据也可以通过双口ram和pci接口输出。本文的主要工作包括： （ 1 ）介绍了线性调频雷达距离分辨力和调频线性度的关系。 |
| 3. | Large time - band product signals such as linear frequency modulation signals ( lfm ) , nonlinear frequency modulation signals ( nlfm ) , phase coded signals and so on are one of key technologies for pulse compression radar systems
具有大时宽带宽积的信号，如线性调频信号、非线性调频信号、相位编码信号等是雷达应用脉冲压缩技术的关键之一。 |
| 4. | In this dissertation the pulse compression performances of linear frequency modulation signals ( lfm ) and the algorithm of mti / mtd are analyzed . programme and its optimization of them based on 2 pieces of adsp - ts203 are introduced in detail
全文主要分析了线性调频信号( lfm )的频域脉冲压缩方法及mti / mtd的算法;详细介绍了基于两片ts203的脉冲压缩和mti / mtd的程序设计及其优化。 |
| 5. | At first , this paper gives an overall introduction to the basic theories of matching filter and the properties of linear frequency modulation signal , preprocessing the radar data by the matching filter will give advantage to improve the compression performance in later processes
本文首先介绍了匹配滤波理论和线性调频信号的性质，并采用匹配滤波方法对雷达回波预处理，以利于后续压缩处理过程提高压缩性能。 |
| 6. | Pulse compression technique and large timeband product signals such as linear frequency modulation signals , nolinear frequency modulation signals , phase coded signals and so on are widely used in modern radar systems to improve the resolving power both in range and in speed domain
现代雷达为了提高雷达作用距离和速度分辨力、距离分辨力，广泛采用了脉冲压缩技术及大时宽带脉压信号如：线形调频、非线形调频、相位编码信号等。 |
| 7. | Pulse compression technique is widely used in modern radar systems . it solves the contradiction between the range and velocity resolution . large time - bandwidth product signals such as linear frequency modulation signals ( lfm ) are used in pulse compression technique to improve the resolution in range domain
现代雷达系统广泛采用脉冲压缩技术,在确保雷达作用距离和速度分辨力的前提下,采用大时带积脉冲压缩信号:如线性调频( lfm )信号提高距离分辨力。 |
| 8. | In this dissertation the pulse compression performances of linear frequency modulation signals ( lfm ) , nonlinear frequency modulation signals ( nlfm ) and design of their side - lobes suppression filters are analyzed , and design of the pulse compression program of 4 pieces of adsp21160 in the processing unit and the program of single piece of adsp21160 and fpga in the interface unit of the pulse compression system are introduced in detail
全文分析了线性调频信号( lfm ) ,非线性调频信号( nlfm )的频域脉冲压缩方法及其旁瓣抑制滤波器的设计和优化,详细介绍了脉冲压缩系统中基于4片adsp21160的处理单元和单片adsp21160和fpga组成的接口单元的软件设计。 |
| 9. | This dissertation mainly studies the pulse compression waveform designing and signal processing , including the following aspects : firstly , by the pulse compression basic theory , the linear frequency modulation signal ( lfm ) , binary phase - coded signal ( bc ) and stepped - frequency ( sf ) signal are discussed respectively including the ambiguity function , pulse compression and spectrum characteristic
本文主要进行脉冲压缩雷达波形设计以及信号处理方面的研究,主要体现在以下几个方面:首先,从脉冲压缩基本理论出发,分别给出了线性调频、二相编码和频率步进信号的模糊函数、脉冲压缩以及频谱特性,对多普勒性能进行了简要分析。 |
| 10. | The second , at the high frequency primary coil , when switch turn on with control signal ( the spwm pulse is modulated ) , in the positive or negative semi - period of low frequency modulation signal , transformer coil with same direction voltage . the magnetic flux of transformer core will increase step by step . at the end , it leads to magnetic flux saturation
二、在高频变压器原边，当开关管接收控制信号脉冲列(经调制的spwm波列)导通时，在低频调制信号的正半周或负半周内，施加在变压器绕组上的是同一方向的电压，变压器磁芯中的磁通可能将级进地逐渐增加，导致磁芯饱和，造成磁偏或单向磁化，导致低频电信号放大失真或由于很大的磁化电流而无法正常工作。 |
