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。
This code is cdma2000 baseband signal processing algorithms pn code generation process.
此代码是cdma2000基带信号处理过程中pn码的产生算法程序。
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。
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。
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。
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。
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；
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。
Then a hierarchical scan algorithm is proposed to identify the sector PN code, which reduces search time greatly.
其次，提出分层搜索的扇区标识值识别算法，该算法能大大减少检测和识别时间。
Spread-spectrum PN code ranging and differential Positioning technology are used to make it possible to reach such accuracy.
达到高精度的关键是应用了伪随机码扩谱及差分定位技术。
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。
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。
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。
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 problem of PN code acquisition is the key technique in DSSS receiver when there are narrowband interferences in the received signal.
本文针对新型的卫星用接收机伪码捕获的性能指标要求 ，设计了一种基于中频直接采样数字化的伪码捕获算法。
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。
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。
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。
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。
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。
The paper discusses the acquisition and tracking of the PN code and the tracking of the carrier in high dynamic range , low SNR and long PN code.
讨论了高动态、低信噪比、长伪码序列扩频信号的伪码捕获、跟踪、载波跟踪与数据解调方法。
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。
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。
A method using cubic-spline interpolation to process correlation peaks was proposed to improve the precision of BOC-modulated signal PN code phase measurement.
提出了利用三次样条插值法，处理BOC调制信号相关谱主峰及副峰的数据，以提高相位测量精度的算法。
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。
The paper presents a spread spectrum signal acquisition speed sliding correlation method base on FPGA, to address the problem of capture long PN code under low SNR.
文中提出了一种基于FPGA的扩频信号快速滑动相关捕获方法，来解决低信噪比条件下长伪码序列的捕获问题。
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。
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 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。
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