宽带干扰自适应旁瓣相消的方法研究

依据自适应旁瓣相消原理,着重分析了宽带干扰信号对旁瓣相消性能的影响,针对宽带干扰影响下,主辅天线间的波程差、主辅天线通道频率特性的不一致性以及主天线旁瓣的频率敏感特性等引起的自适应旁瓣相消系统的主辅天线2通道信号的去相关作用,采用了主天线通道均衡和子带自适应相消2种方法改善带宽特性,并通过MATLAB仿真验证,仿真结果表明该两种方法均可明显改善系统的相消性能,达到良好效果。     

通道均衡对自适应旁瓣相消性能影响的研究

由于通道之间幅相特性的不一致(通道失配),导致在自适应旁瓣相消(ASCL)系统中相消性能严重下降。通道均衡器是补偿通道失配的一种有效方法。文中在仿真分析通道失配对自适应旁瓣相消性能影响的基础上,研究了影响均衡性能的几个主要参数与旁瓣相消性能的关系。最后,通过仿真验证了通道均衡技术的引入可以较大幅度的提高旁瓣相消性能,所得结论对实际工程设计中实现中提高自适应旁瓣相消性能有一定指导意义。     

基于TMS320C31的数字式天线旁瓣相消原理及其实现

天线旁瓣自适应相消是对付旁瓣有源干扰最有效的办法，天然旁瓣自适应相消技术主要去的是由天线旁瓣进入雷达的有源电子干扰信号，也可消去由旁瓣进入的工业干扰，本文在介绍了自适应相消原理之后，推导出使于数字处理的理论公式，在后结合某雷达的技术参数给出自适应旁瓣相消的具体实现方案，最后通过仿真，分析了旁瓣相消的性能。     

相控阵雷达自适应旁瓣相消技术

本文讨论了利用数字信号处理技术仰制从天线旁瓣进入雷达系统的有源干扰问题，即自适应旁瓣相消技术。介绍了相控阵雷达及自适应旁瓣相消技术发展的背景和状况。结合某型相控阵雷达研制的工程实际，从理论上分析技术发展的背景和状况。结合某型相控阵雷达研制的工程实际，从理论上分析了自适应旁瓣相消的工作原理；推导了干扰信号与旁瓣相消权值的关系等。     

自适应旁瓣相消的性能分析与仿真

在数字阵列雷达中自适应旁瓣相消技术是抑制有源干扰的有效措施,理论上干扰是可以完全对消,但实际应用中由于存在诸多因素影响使对消效果明显下降。该文以自适应旁瓣相消基本理论为基础,深入探讨了自适应旁瓣相消的理论性能与实际性能相差甚远的各种原因,包括通道噪声、时延带宽积、带宽不一致、中心频率不一致、幅度相位特性差异、主天线旁瓣敏感性对旁瓣相消性能造成的影响,并通过大量仿真分析了各项因素对相消性能的影响,对实际工作有重要的参考价值。     

自适应天线旁瓣相消技术仿真与分析

自适应天线旁瓣相消技术是在天线技术、自适应滤波以及阵列信号处理相结合的基础上发展起来的。利用自适应旁瓣相消系统能够使雷达天线的旁瓣零点自适应的对准干扰的到来方向，最大程度的抑制干扰。同时，还可以大大提高主天线的信干噪比。     

一种旁瓣相消系统的权值算法及其空域频域响应特性

旁瓣相消的目的是减弱雷达旁瓣接收到的干扰信号,它通过配置辅助天线改变雷达天线的接收方向图来实现。本文用最小二乘算法计算出了一种带有两个辅助天线的旁瓣相消系统的自适应权值,并利用Matlab对该系统的空域和频域响应进行了仿真和分析,结果发现干扰的方位和带宽都会影响相消系统的响应特性。     

相控阵雷达自适应旁瓣相消效果分析

依据自适应旁瓣相消的原理，对辅助通道数和干扰个数的关系、样本数对相消效果的影响、通道的不一致性对相消性能的影响进行了数学及物理意义上的解释，并通过仿真验证。探讨分析了相控阵雷达开环自适应旁瓣相消的技术性能。     

辅助天线不同排列形式及位置变化对SLC影响

本文研究了当辅助天线不同摆放形式及位置变化对旁瓣相消性能的影响,给出存在幅相误差及位置误差时数学模型,讨论存在误差时旁瓣相消性能变化,并在二维自适应旁瓣对消中使用降维方法求解权,最后计算机仿真分析证明了相关结论的正确性.     

外辐射源雷达系统中的自适应旁瓣相消及其ADSP-TS101s实现

基于外辐射源的雷达系统中可以使用自适应天线旁瓣相消技术以消除直达波和多径杂波的影响。以外辐射源雷达信号处理系统为基础,首先讨论了自适应天线旁瓣相消的原理,结合实时信号处理机的设计,给出了一种基于ADSPTS101sTigerSHARCDSP平台实现自适应天线旁瓣相消的硬件设计方案和软件实现流程。外场实验数据给出的处理结果说明本文方案是有效的。     

A 10-bit 100-MS/s CMOS pipelined folding A/D converter

This paper presents a 10-bit 100-MSample/s analog-to-digital（A/D） converter with pipelined folding architecture.The linearity is improved by using an offset cancellation technique and a resistive averaging interpolation network.Cascading alleviates the wide bandwidth requirement of the folding amplifier and distributed interstage track/hold amplifiers are used to realize the pipeline technique for obtaining high resolution.In SMIC 0.18μm CMOS,the A/D converter is measured as follows:the peak integral nonlinearity and differential nonlinearity are±0.48 LSB and±0.33 LSB,respectively.Input range is 1.0 V_P-P with a 2.29 mm² active area.At 20 MHz input @ 100 MHz sample clock,9.59 effective number of bits,59.5 dB of the signal-to-noise-and-distortion ratio and 82.49 dB of the spurious-free dynamic range are achieved.The dissipation power is only 95 mW with a 1.8 V power supply.     

一种新型FMCW雷达射频对消方法

随着平台一体化及雷达系统微型化的发展,调频连续波(FMCW)雷达发射至接收的信号泄漏更为严重,信号泄漏已成为制约FMCW雷达系统性能的关键因素。为解决这一问题,提出了一种新型的射频对消方法以提高FMCW雷达的收发隔离度,利用FMCW雷达泄漏信号与回波信号在频域可分离特点,采用数字锁相环技术产生主动对消矢量信号,在给定FMCW雷达泄漏信号初值的条件下仿真分析对消比与相位误差、幅度误差的关系,建立了特定条件下的具有自适应功能的射频对消方案,并设计了验证电路以验证方案的可行性。验证结果表明该方法在1 GHz带宽内实现了优于25 dB 的对消比,且该对消电路具有低功耗、结构简单等优势。     

Cancellation performance of co-site antenna interference cancellation system for AM interference

The interference cancellation performance of actual co-site antenna interference cancellation system (CICS) under amplitude modulation jamming signal was analyzed.The expressions of the steady-state weights and theirs structure characteristics of the interference cancellation system under the AM signal were given.The formulae of the interference cancellation ratio (ICR) for carrier frequency and side frequency were derived.The influence factors and the influence rules of the ICR were analyzed.The steady state weights of the interference cancellation system (ICS) were the weighting of the carrier frequency optimal weights and the edge frequency optimal weights according to the power ratio.The increase of the signal bandwidth will increase the discreteness of the carrier frequency optimal weights and the edge frequency optimal weights and lead to the decrease of the interference cancellation ratio (ICR).The decrease degree of the edge frequency ICR was greater than that of the carrier frequency ICR.To improve ICR by increasing the gain was limited.The relationship between the interference cancellation ratio limit and the equivalent transmission delay was given.The design method of the interference cancellation system to improve the ICR under the AM signal was proposed.Finally,the correctness and validity of the theoretical analysis was verified by simulation.     

射频自适应干扰抵消系统的分析与设计

自适应干扰抵消系统对提高电子对抗装备性能有非常重要的意义。在对自适应抵消系统原理模型进行总体分析的基础上,提出了系统的射频实现方案并对方案的性能做了详细的分析。针对工程实现过程中的一些问题进行了讨论,并给出了一些解决方法。依据该方案在225~400 MHz的工作频段内设计完成了性能较好的自适应干扰抵消系统,系统窄带抵消比接近50 dB,抵消时间小于1 ms,并且在整个工作频段内性能稳定可靠。     

Performance Analysis of Parallel Interference Cancellation for Multi-carrier DS-CDMA

The parallel interference cancellation for multi-carrier DS-CDMA （which is termed FDC-PIC） is proposed by integrating frequency diversity combination. The simulations are made over FDC-PIC with respect to different decision ways hard, soft and linear decisions, respectively, and we conclude that FDC-PIC acquires superior performance improvement over correlation reception of multi-carrier DS CDMA. With an increase in interference cancellation stages, the system performance is improved further. The initial 2 stages bring about the most dominant performance improvement, but up to the 3rd stage the system performance is improved little. It is also shown by the simulation results that FDC-PIC with soft decision would exhibit the best performance with a high implementation complexity, while FDC-PIC with linear decision acquires performance comparable to that of FDC-PIC with soft decision with a reduced-complexity if the number of the interference cancellation stages is the same, which indicates that FDC-PIC with linear decision has optimal performance/complexity tradeoff and therefore will be suitable for practical application in future.     

一种相控阵雷达射频域自干扰对消方法

在相控阵雷达系统中,为了保证回波信号的正确接收,需要在接收阵元天线的射频前端对自干扰信号进行对消处理。随着雷达信号带宽的增加,其形成的自干扰信号的消除难度加大。针对该问题,提出了一种射频域自干扰分段对消方法。该方法利用同一个自干扰对消通道对不同时间段的自干扰信号进行对消处理。对带宽为300 MHz 的线性调频信号进行仿真验证发现:当抽头个数为4时,自干扰分段对消方法的性能可达50 dB,比抽头个数为7时的传统的多抽头对消方法高出18 dB。因此,相较于传统的多抽头对消方法,所提出的自干扰分段对消方法可以在更低的硬件复杂度下实现更高的对消性能。     

Performance analysis of broadband self-interference cancellation at RF domain in co-frequency co-time full duplex systems

Due to the lack of performance analysis of the RF domain broadband self-interference cancellation algorithms in the co-time and co-frequency full duplex system,the multi-tap RF domain self-interference cancellation structure were considered,and the optimal solutions of its parameters to minimize the residual interference signal power were discussed,then its achievable interference cancellation capability was analyzed.By analysis and simulation,the performance of the multi-tap structure was associated with the interference bandwidth,the carrier frequency,and the differences between the multi-tap delays and multipath delays of the self-interference channel.The greater the signal bandwidth is,or the larger the differences between the multi-tap delays and multipath delays are,the worse the interference cancellation performance is.Besides,the interference cancellation performance is periodic oscillation with the increase of carrier frequency.     

参考信号耦合有用信号对干扰对消系统的影响及其抑制

分析了参考信号耦合有用信号时,实际自适应干扰对消系统的时域特性。分析表明,参考信号含有用信号导致系统时变,改变系统的最佳权值,使系统的干扰对消效果下降,并对有用信号的接收产生影响。根据实际共平台通信系统的收发耦合特性,从时域角度分析得到系统干扰对消比和有用对消比的计算表达式,并得到干扰对消比和有用对消比随相对时延相位变化的规律。提出一种时延匹配方法,通过匹配参考信号提取点至正交功分器输出与接收天线至合成信号注入点间的时延,可以有效抑制参考信号耦合有用信号导致干扰对消效果下降的问题。仿真结果表明,所提出的时延匹配方法能消除有用信号对干扰对消比的影响,还能提高干扰对消效果。     

自适应干扰对消系统中的时延匹配

分析了模拟实现的自适应干扰对消系统中存在时延失配情况下系统的性能.通过理论计算求解了时延条件下的周期时变微分方程组,得到时延增大与系统收敛速度降低的结论,分析得到系统稳定性的判断标准.通过对系统模型的简化分析,得到时延与稳态权值的关系式,并求解得到时延与稳态误差的量化关系,以及干扰对消比随时延变化的规律.最后通过仿真和...