| 1. | Simulation of synchronization algorithm of satellite p - code signals for gps
码信号同步算法的仿真研究 |
| 2. | The software synchronization method , which can be used to recovery the eye diagram of asynchronous sampling data , was analyzed
分析了利用异步取样数据实现软件同步恢复从而获得随机码信号眼图的算法，为今后的应用研究打下基础。 |
| 3. | ( 3 ) the features of the low frequency time - code receiver are digital , high performance and high precision . on the basis of the testing flat of low frequency time - code , we designed a low frequency time - code receiver based on software radio
在前面已经实现的低频时码信号测试平台的基础上，对设计一种基于软件无线电模式的低频时码接收终端作了初步的探讨，为今后的全数字化接收机的实现打下一定的基础。 |
| 4. | At first the merits and implementation of the digital pulse compression subsystem are introduced in this paper . then the characteristics of phase coded signals are discussed and the two classic binary phase codes ? ? barker code and m - sequence are dealt with in details in the following
文中首先综述了数字脉冲压缩的优点及其实现方法，接着讨论了相位编码信号的特点，并详细分析了巴克码和m序列这两类典型的二相码信号。 |
| 5. | The anti - jamming technology include sidelobe canceller and sidelobe blanking , the effect of these anti - jamming technology are presented also . in the chapter 4 the modeling of targets reflection signals are described , these signals consist of coherent pulse , chirp and barker sequences
第四章讨论了雷达回波信号的建模，主要涉及到的信号有相参脉冲信号、线性调频信号及巴克码信号，分析了它们各自工作在何种环境下及各自的特点。 |
| 6. | This paper analyses deterioration model of bar code signals after the point spread function convolution , and presents two kinds of recognition algorithm in correspondence to different bluring degrees of bar code signal : one based on midpoints detection and the other based on waveform analysis
分析了条码信号经过点扩展函数卷积后的降质模型。针对条码信号模糊程度的不同，提出两种识别方法：基于中点检测的条码识别方法和基于波形分析的条码识别方法。 |
| 7. | There are two uncertain factor about it : the phase of the pn code and the doppler - shift . after capturing the received signal successfully , the traditional ds receiver always uses a delay locked loop ( dll ) to synchronize the pn code and then uses a costas loop to realize the carrier synchronization . this complex closed - loop structure not only take long time to realize the synchronization , but also has the defect of “ hang up ”
传统的扩频接收机通常在捕获伪码信号后利用迟早门鉴相的延时锁定环来实现伪码的精同步,解扩后利用科斯塔斯环实现载波同步,这种闭环结构不仅同步时间长、结构复杂,而且锁相环还存在所谓的“ hang - up ”现象。 |
| 8. | In this paper , according to the theory of signal detection and estimation , the optimal receiver pattern of pn code signal is introduced and theoretically , the relation curve of the probability of the correct detection with the input s / n ratio under the different probabilities of false alarm is illuminated
根据信号的检测和估计理论，文中分析了数字相关器实现伪码信号接收的最佳模型，从理论上计算了在不同的虚警概率下，检测概率随输入信噪比的变化曲线，并分析了doppler效应对伪码相关接收的影响。 |
| 9. | In order to meet to the higher timing precision of the low frequency time - code timing terminal , the applications of dsp ( digital signal processing technology ) in the time service is researched in this paper . the main works and contributions can be summarized as follows : ( l ) the low frequency signal transmission and dsp technology are discussed . according to the system needs , a testing flat of low frequency time - code based on dsp is built up
本论文的工作针对低频时码授时高端用户的定时需求，对数字信号处理( dsp )这一新型技术在该领域应用进行了探索性研究，主要完成和开展了如下工作： ( 1 )研究分析了低频信道和dsp技术，根据系统要求，从硬件上实现了基于dsp芯片的低频时码信号的采集测试平台。 |
