With the demand of such field as communication reconnaissance, comb filters application to capture of short cycle PN-code under self-jamming cartier is studied.
针对通信侦察等领域的需要，将梳形滤波器应用于自干扰载波下短周期伪码的截获中。
As the PN-code high performance of long period and the coherence, the very long distance and high precision ranging can be reached at the same time. Multi-target TT&C can be reached by CDMA of PN.
由于伪随机码固有的测距能力——其长周期和互相关特性，使得在测距距离和精度方面可以同时提高，采用码分多址技术可以实现对多个目标同时进行测控。
A new receiver structure was proposed for adaptive smart antennas in CDMA mobile communication systems, requiring only the knowledge of the desired user's pseudo noise (PN) code sequence.
利用码分多址(CDMA)系统中的用户伪随机(PN)码信息，提出了一种新的自适应智能天线结构。
Based on the performance of PN code and carrier tracking loop, an optimal loop bandwidth is presented.
在分析伪码和载波跟踪环性能的基础上，给出了跟踪环路的最优带宽。
This algorithm firstly calculates the average power serial, and then finishes the detection of PN code rate through the analysis of frequency spectrum and smooth processing.
该算法首先计算序列的平均功率，然后对其进行谱分析并作平滑处理而完成伪码速率的判定。
Based on the adaptive Kalman filtering algorithm, an estimator for the GPS PN code tracking error with model bias is proposed.
在自适应卡尔曼滤波算法的基础上提出了一种带模型偏差的GPS伪码跟踪误差估计器。
In fact, as the result of the period of a PN code, cyclostationarity is a key property of DSSS signal.
事实上，由于伪码的周期性而导致的循环平稳是扩频信号的一个重要特征。
Slip correlative taking and delay locked loop are used for the synchronization, taking, locking of PN code.
采用滑动相关捕获和延迟锁定环实现伪码的同步、捕获和跟踪；
This paper proposes a simple and practical threshold adaptive estimating method for PN code acquisition.
该文提出一种简单、实用的PN码捕获门限自适应设置方法。
One is the detection of low SNR DSSS signal and extraction of length of PN code, the other is detection of BPSK signal from multi signals.
对直扩信号侦测的计算机模拟结果表明，该方法不仅能检测到低信噪比的此类信号，而且能提取到扩频码周期等参数。
Discusses the basic theory of PN code parallel fast acquisition of high dynamic in GPS, the method of confirming the auto adaptive threshold and some important problems in acquisition process.
讨论了高动态下GPS伪随机码并行搜索的基本原理，以及自适应门限确定方法与搜索过程中应注意的问题。
The mathematics model of DSSS, PN code, correlative reception of spread spectrum signal, synchronization and tracking are studied.
研究了直扩系统的数学模型，扩频用的伪随机码，扩频信号的相关接收，扩频系统的同步和跟踪等。
The first two synchronization algorithms employing Barker code and PN sequence.
前两种同步算法使用了巴克码与PN序列来提高同步性能。
The spread spectrum communication with an aperiodic PN code and under strong man-made jammers has an important significance in military communications.
强人为干扰环境下的非周期扩频码的扩频通信在军事上具有重要的意义。
The design of the PN code acquisition of the Direct Sequence Spread Spectrum(DSSS) system for a Unmanned Aerial Vehicle(UAV) TT&C System is described in this paper.
讨论一种用于某无人机直序扩频通信测控系统的PN码捕获方案。
For any PN code acquisition system in spread spectrum communications, the acquisition performance is largely dependent on the probabilities of detection and false alarm.
对于任何一种扩频通信pN码捕获系统来说，捕获性能在很大程度上取决于检测概率和虚警概率。
Initial synchronisms of CDMA communication system receiver include PN code sync, symbol sync, frame sync, sync of scramble code, and so on.
CD MA通信系统接收机的初始同步包括PN码同步、符号同步、帧同步、和扰码同步等。
In consideration of the synchronization of PN code in spread spectrum communication system, a acquisition and track scheme of PN code based on the theory of match filter is analyzed.
针对扩频通信系统中的伪码同步问题，分析了基于匹配滤波捕获跟踪算法的伪码数字化同步方案。
One of the difficulties of designing GPS receiver working under high dynamic circumstance is to fast acquire the satellite PN code.
设计在高动态环境下工作的GPS接收机，其难点之一在于对卫星伪码的快速捕获。
In this article, we propose a fast correlation algorithm of multiple PN code by fast Walsh Transform (FWT).
本文提出了一种利用快速沃尔什变换(FWT)实现对复合码进行快速相关的算法。
Calculated results by these formulas are very well in agreement with the results simulated by a digital computer. This shows that they can be used in PN code system design.
计算结果与计算机模拟的结果都很符合，因此可应用于PN码系统的设计中。
This paper puts forward the concept of MC CDMA system, that can both measure distance accurately with PN code and transmit High speed data.
提出了多载波码分多址测控通信系统的概念。该系统不但能完成伪码精确测距，而且能进行高速数据传输。
A digital GPS PN code acquisition circuit based on direct IF sampling is presented.
文中提出了基于直接中频采样的数字化GPS接收机码捕获电路。
Using this method, the synchronized PN code phase and approximation value of Doppler shift are got.
该捕获方法在捕获到同步长周期伪码的同时，也得到了多普勒频偏值的近似值。
The second part is the third chapter, which explains the PN code adopted by spreading spectrum in this system and the power testing algorithm.
第二部分为第三章主要从软件算法实现方面进行阐述，该部分包括系统扩频码选取及不同长度扩频码性能比较分析和功率检测算法。
To design the GPS receiver working in high dynamic circumstance, the first problem to be settled is how to catch the PN code of the satellite.
设计在高动态环境下工作的GPS接收机，其难点之一便在于对卫星伪码的快速捕获。
For DSSS system with antenna array, the spatial-temporal correlator (STC) is proposed for the acquisition of the PN code and adaptive beamforming weight.
对于使用阵列天线的直接序列扩谱系统，提出使用空时相关器方法实现码捕获和自适应波束形成权值捕获。
The algorithm is applicable to precise measuring of the PN code phase of satellite positioning signals and spread-spectrum ranging signals.
该算法的主要应用领域为卫星定位信号和直序扩频测距信号PN码相位的精确测量。
Following, code tracking confirm the PN code phase precisely and track every multipath component's delay drifting due to Doppler effect.
同步跟踪则由多径跟踪的结果精确估计PN序列码相位，并实时跟踪信道各径成分由于多普勒效应产生的时延漂移。
The dissertation use theories analysis , computer simulation methods with hardware to analyze system performance , data-mapping method and effect of PN code.
如果扩频序列采用正交性能好的伪随机码，系统的性能可以优于其他系统；
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