共查询到20条相似文献,搜索用时 218 毫秒
1.
2.
研究被动相控阵资源优化调度.相控阵雷达实现目标跟踪,精度和实时性是主要的指标.针对现有的主动相控阵资源调度不能很好地解决被动环境下搜索截获概率低,跟踪精度差的问题,提出一种被动相控阵雷达自适应调度算法(以下简称为被动自适应调度算法).算法根据被动截获、跟踪的特点,设计被动自适应调度算法的实现框架,重点研究了被动自适应调度的任务参数自适应生成、任务优先级评估及调度自适应执行等算法过程,并给出了被动自适应调度算法性能评估指标.仿真结果表明,该算法能优化安排被动相控阵雷达时、空、频等资源,缩短目标发现时间,保证跟踪稳定性. 相似文献
3.
X波段双偏振相控阵雷达的主要应用是监测气象灾害,为提升监测精度,提出了X波段双偏振相控阵雷达回波特征分析与相态识别方法。采用相关系数优化与差分传播相移率重构方法提升X波段双偏振相控阵雷达回波信号质量;利用高分辨融合与时频变换检测质量提升后的雷达回波信号时频点,通过时频点聚类与小波频谱特征分离获取雷达回波信号时频特征。将相同位置的雷达回波信号时频特征作为一个样本,采用动态聚类方法针对相应范围内的全部样本实施动态聚类分析,基于分析结果中的聚类中心识别X波段双偏振相控阵雷达回波信号相态。实验结果显示该方法能够提升弱回波的相关系数、消除回波信号异常值,能够较好地输出回波信号时频特征,准确识别回波信号相态。 相似文献
4.
针对雷达在对抗特定的ESM侦察设备时被截获距离难以直接测试的问题,研究了雷达被ESM侦察设备截获距离的等效试验方法.首先,推导了期望试验条件和替代试验条件下被截获距离的等效模型.然后,针对不同的试验场景,将等效模型细分为四种不同的类型.最后,通过某型雷达被截获距离外场试飞的实测数据对等效模型进行了验证.试验结果表明等效... 相似文献
5.
6.
7.
针对低截获概率雷达信号的调制识别问题,提出了一种新的调制类型识别算法,完成了LFM、BPSK、2FSK、Frank/P1/P2/P3/P4码8种低截获信号的识别分类。首先,根据有无调频斜率,利用PFRFT完成低截获信号的预分类。然后,综合利用分数阶域主副脊线及功率谱估计完成信号的自动分类识别,给出了分类识别算法的流程图及具体步骤。最后通过仿真实验,表明该算法具有很好的识别效果,证明了该方法的有效性和可行性。 相似文献
8.
9.
10.
基于相控阵雷达工作原理,分析了天线扫描对波束宽度和天线增益的影响;以往只考虑相控阵雷达电扫法线跟踪测量精度,未考虑相控阵雷达偏轴电扫跟踪测量精度;通过雷达步进偏轴跟踪模拟目标方法,采集雷达角度补偿数据库,实现了偏轴扫描跟踪角度误差补偿;试验结果表明,该补偿方法能够提高相控阵雷达偏轴扫描跟踪坐标测量精度。 相似文献
11.
An electronic support system receiver which is a passive receiver picks up an interleaved stream of pulses and extracts their pulse parameters. These parameters are sent to a deinterleaving subsystem which sorts them and forms pulse cells that each are assumed to belong to a specific emitter. In this paper, we develop a method for this task of deinterleaving of radar pulse sequences. For this aim, a novel pulse amplitude tracking algorithm is proposed for dynamically varying signal environments wherein radar parameters can change abruptly. This method particularly works for air-to-air engagements where pulse amplitude distortion due to channel effects can be considered negligible. Simulation results show that the proposed algorithm incorporated with a clustering algorithm improves deinterleaving of radar emitters that have agile pulse parameters such as airborne radars. 相似文献
12.
13.
Time is a valuable resource in phased-array radar and proper use of it enables the radar to track more targets simultaneously. Appropriate usage of time in the tracking means the radar can minimize the revisit rate of the tracked targets while the accuracy of targets position estimation is still acceptable. In this paper, a new method for determination of target revisiting time is proposed which has relatively low computational cost and uses steady state filters with Interactive Multiple Models structure. The proposed algorithm allows the radar designer to determine the filter parameters by some criteria such as the desired accuracy and targets maneuver. The performance of the proposed method is compared with the conventional filters for standard maneuverable flying targets. Simulations show the better accuracy and reliability of the proposed method beside its less target revisit time and computational load. 相似文献
14.
15.
Radar emitter recognition plays an important role in electronic warfare (EW). Specific radar emitter recognition is the state-of-art technology of emitter recognition, which can recognize the different radar devices of the same type. It is a composite task that involves radar signal interception, modulation recognition, features extraction and classification. In this paper, first we study the unintentional modulation on pulse (UMOP) features of radar emitter. Then the iterative least-square method is introduced for estimation of the UMOP features. Because of the discriminatory capability and abundant information of cyclostationary signatures, the zero frequency slice of cyclic spectrum is used for specific radar emitter recognition. Based on these, the sequential iterative least-square (SILS) algorithm is proposed for the online recognition of radar emitters. Finally experiments on three simulation radars and eight actual intercepted radars with the same type verify the correctness and validity of the proposed method. 相似文献
16.
From the view of electromagnetic scattering,it is indicated that the micro-Doppler (m-D) character-istics of an extended target undergoing micro-motions are actually induced by the change of incident directions of radar pulses.Different micro-motions may lead to similar change of incident directions,consequently inducing similar m-D characteristics.To tackle this problem,rather than distinguish warhead and decoy directly from m-D characteristics,the frequency components of m-D frequency curves are used as a new characteristic for recognition in this paper.To get high precision of frequency components estimation,model-based parameter estimation (MBPE) is utilized to extract the m-D frequency curves from TFR.To obtain high accurate simu-lation results,the backscattered signal simulation is conducted by full-wave numerical method.The simulation results validate the theoretical analysis and the high performance of the proposed method. 相似文献
17.
18.
19.
20.
针对现有基于商用WiFi设备的人体手势识别方法存在的子载波选择不够优化、动作区间截取不够精确等问题,提出一种基于近似熵子载波选择的人体手势识别(AEGR)方法.利用提出的最小近似熵法构建识别方法待处理的CSI幅值数据,对构建的数据采用小波去噪和中值滤波组合法进行去噪;利用滑动窗极差法精确截取CSI幅值的动作区间,据此提... 相似文献