基于人工智能的改进PID纠偏算法分析

对基于人工智能的PID纠偏算法进行了研究。首先对PID人工智能算法进行了简要介绍,然后对传统的PID纠偏算法进行了分析,在此基础上提出了增量PID纠偏算法,并对其参数的加权系数进行了讨论和分析。     

一种双被动传感器多目标航迹起始算法

提出了一种针对双被动传感器的空间多目标航迹起始算法,文中对算法步骤进行了详细介绍,并对算法进行了仿真,验证了算法的有效性,同时分析了该算法的相应指标。     

MAP算法在Turbo码译码中的应用和研究进展

对Turbo码译码算法进行了综述,包括SOVA、MAP、LOG-MAP、MAX-LOG-MAP等算法,并对这几种算法进行了比较。同时根据近年来对Turbo码译码算法的研究,对几种新的译码算法进行了介绍和讨论。     

基于遗传算法的MF-HF天调调谐算法

介绍了对分搜索算法、Hooke&Jeeves算法和Powell算法等基于直接搜索的MF-HF天调调谐算法,指出了其容易陷入局部最优解的问题。提出基于遗传算法的天调调谐算法,对算法的基本流程进行了介绍。结合近似计算和邻域搜索的思想,对调谐算法进行了改进,减少变量个数,缩小算法搜索空间。通过对4m鞭状天线进行调谐仿真,验证了遗传算法作为调谐算法的有效性,同时改进后的算法在调谐速度和匹配精度上获得了明显的改善。     

基于PRI的脉冲序列去交错方法

论述使用脉冲重复间隔 (PRI)对雷达脉冲去交错的算法 ,分析PRI变换算法并对算法进行计算机仿真。对PRI变换算法进行改进 ,并对改进算法进行了计算机仿真和分析     

图数据中频繁模式挖掘算法研究综述

 本文对图数据中的频繁模式挖掘算法进行了综述.依据算法的特性和数学基础对算法进行了分类,主要集中于算法的求解思想和不同算法之间的关系的比较,并对一些著名的算法进行了详细的分析和讨论.基于算法的特性,比较了各种算法适用的范围以及应用领域.最后,讨论了频繁模式挖掘的最新进展及未来的研究方向.     

计算生物学中相关问题算法及思考

对计算生物学中用于RNA结构预测的GT fold算法进行了改进。首先,介绍了RNA 的结构;之后,列举了目前用于结构预测的主要算法,并着重介绍了GT fold算法;其后,为了提高GT fold原始算法的收敛速度,提出了并行化计算和内部环加速算法两种改进行算法;最后,针对实际应用中GT fold算法所出现的偏差进行了分析,对算法后续的发展进行了展望与思考。     

改进的“最近邻”航迹相关算法研究

从经典算法的改造出发,提出了改进的"最近邻"算法.传统的"最近邻"算法利用了Kalman等滤波算法中目标位置信息的预测值进行相关,而改进算法借用了"最近邻"算法的基本原理,利用了雷达回波参数的径向多普勒速度信息,对目标下一时刻的位置进行预测,然后进行相关处理.通过仿真对两种算法进行了比较,仿真结果表明该算法处理结果明显优于传统的"最近邻"算法.     

MIMO无线通信系统中调度算法分析

对轮询算法、最大载干比算法和比例公平算法三种经典的调度算法进行了深入的研究,并在MIMO系统环境中,对它们的性能进行了计算机仿真。从基本原理和仿真结果两个方面,对上述三种调度算法的公平性和系统吞吐量性能进行了对比分析,证明了轮询算法具有最好的公平性性能,最大载干比算法具有最好的吞吐量性能,比例公平算法则很好的在两者之间取得了一个平衡。     

基于LMS算法的天线波束方向图仿真研究

最小均方（LMS）算法是一种常用的天线波束形成算法。本文首先对LMS算法的一般原理进行了研究,然后对LMS算法进行了改进,将固定步长改为变步长,最后应用Matlab对算法进行了仿真。仿真结果表明改进的LMS算法具有良好的效果,收敛速度比经典LMS算法更快,对天线性能有一定的提高。     

多制式彩色电视机抗扰度的测试

本文论述了PAL B/G．PAL D／K，PAL I．SECAM B/G，SECAM L．SECAM D/K六种电视接收制式在测试传导电压抗扰度和辐射抗扰度时的测试限值以及需要除去的频率。     

SECAM制H方式识别电路的纠错

本文对SECAM制接收机H方式识别电路的纠错过程进行了分析,并以AN5630解码块中的识别电路为例进行了详细介绍。     

PAL／SECAM解码接口电路

文中讲述了PAL/SECAM双制解码电路设计时考虑的要点。结合整机给出了实用的接口电路,以及一些必要的数据参数。     

新型多功能LCD显示系统的设计与实现

设计了多功能液晶显示系统。它不仅具有电视功能，还能自动识别各种不同制式（PAL/NTSC/SECAM）的视频信号和不同显示模式（从VGA至SXGA）的PC图形信号，以及数字电视信号，可分别进行相应的处理，转换成LCD满屏显示的数据格式进行显示，其工作过程由MCU经PC控制。     

浅谈电视信号发生器PM5415的校准

根据信息产业部电子601计量站和信息产业部电子203计缱站起草的JJF1235—2010《电视视频信号发生器校准规范》,制式为PAL、NTSC、SECAM的模拟电视信号发生器都能用此校准规范进行校准,该文根据此校准规范埔VM700视频分析仪校准FLIJKE公司生产的璎号为PM5415的电视信号发生器。     

15/30 Mbit/s Universal Digital TV Codec Using a Median Adaptive Predictive Coding Method

This paper describes a 15/30 Mbit/s TV codec with a new approach to high-efficiency coding for TV signals, i.e., median adaptive prediction. The 15/30 Mbit/s codec, commonly applicable to NTSC, PAL, and SECAM (525/60 and 625/50) systems, uses adaptive prediction incorporating a motion-compensated interframe, an interfield, and an intrafield predictor. Its performance for digital transmission is presented. This universal codec is designed, based on CCIR recommendations concerning digital TV coding parameters for studios (Rec. 601) and general principles on long-distance digital TV transmission (Rec. 604). A field trial of 15 Mbit/s digital TV transmission using this codec between earth stations with a 30 m diameter antenna and a 5 m diameter antenna is reported.     

Universal digital TV codec—unicodec

The UNICODEC, developed under the INTELSAT R & D Program, is a TV codec which can transmit and receive any standard signal of NTSC, PAL, or SECAM, by using 15 Mb/s or 30 Mb/s transmission rates (switchable) with two high quality sound channels and one voice circuit. These rates include rate 239/255 BCH FEC for video information. The codec uses the 4:2:2 digital interface for component coding based on CCIR Recommendation 601. The UNICODEC can provide the flexibility to deal with the composite coding now needed in mixed analogue/digital networks, but can also handle either composite NTSC, PAL, SECAM or MAC (multiplexed analogue components), or digital component signals (Y, R-Y, B-Y) in the future. The key technique used here is called MAP (median adaptive prediction) coding, which is one of the adaptive DPCM methods for accurate and simple control in high quality TV transmission; one prediction out of three (interframe, intrafield or interfield) is transmitted without the need for many control bits. There is also a refresh mode for burst error or synchronization recovery. The UNICODEC is expected to provide double capacity with higher quality pictures compared to conventional analogue transmission (FM in 18 MHz). Alternatively, smaller size antennas may be used. This paper describes the objectives of the development of the UNICODEC, its main features and results of field tests.     

HDTV and the vestigial sideband syndrome

Advanced TV (ATV) standards can only be made directly compatible with the 162 million existing TV receivers in the US by delivering the signals to the receiver on a vestigial sideband, amplitude modulated radio frequency carrier. However, low frequency group delays (due to phase error in the vestigial sideband filters required for modulated and demodulation) often generate a delayed edge effect that can obscure the crispness and freedom from artifacts in ATV pictures. Because of difficulties in understanding, quantifying, and controlling low-frequency group delay, vestigial sideband technology may be too fragile to support any form of high-quality ATV. The only alternative appears to be a dual system in which programs are simulcast on different channels to conventional NTSC and new ATV standards. In Europe, terrestrial broadcasting to PAL and SECAM standards will apparently continue indefinitely, while incompatible ATV standards will be used for direct broadcasting from satellites     

Differential encoding of composite secam colour TV signals

The letter describes an adaptive DPCM coding of composite SECAM signals where the nature of the chrominance modulation is entirely different to that of PAL and NTSC. The prediction method is based on the algorithm that the predictor can adapt itself to the frequency variation of the subcarrier. The simulation results demonstrate that this adaptive system has a significant advantage in terms of signal/noise ratio over a nonadaptive system.     

High-accuracy charge-redistribution SC video bandpass filter instandard CMOS

A differential switched-capacitor recursive bandpass filter is presented based on a charge-redistribution technique. The center frequency is 4.286 MHz with a quality factor of 16, and the sampling frequency is 25.7 MHz. It is specifically intended for the high-frequency deemphasis of SECAM TV video signals. The active capacitors are realized using only a sandwich construction of poly-metal1-metal2. A dual-input single-stage telescopic OTA is proposed, which has a very high current efficiency. The filter behavior is very linear, and achieves a dynamic range of 79 dB for 1% third-order intermodulation. The power consumption is only 4 mW for a 5-V supply voltage, and is realized in 0.75 mm² in a standard 0.8-μm double-metal digital CMOS process