【摘 要】
：
To estimate the angle of arrivals (AOA) of wideband chirp sources, a new time-frequency algorithm is proposed.In this method, virtual sensors are constructed ba
【机 构】
：
School of Electronic Engineering, Univ. of Electronic Science and Technology of China, hengdu 610054
论文部分内容阅读
To estimate the angle of arrivals (AOA) of wideband chirp sources, a new time-frequency algorithm is proposed.In this method, virtual sensors are constructed based on the fact that the steering vectors of wideband chirp signals are linear and vary with time.And the randon Wignersville distribution (RWVD) of real sensors and virtual sensors are calculated to yield the new time-invariable steering vectors, furthermore, the noise and cross terms are suppressed.In addition, the multiple chirp signals are selected by their time-frequency points.The cost of computation is lower than the common AOA estimation methods of wideband sources due to nonrequirement of frequency focusing, interpolating and matrix decomposition, including subspace decomposition.Under the lower signal noise ratio (SNR) condition, the proposed method exhibits better precision than the method of frequency focusing (FF).The proposed method can be further applied to nonuniform linear array (NLA) since it is not confined to the array geometry.Simulation results illustrate the efficacy of the proposed method.
其他文献
目的 观察氨溴特罗口服联合孟鲁司特钠佐治咳嗽变异性哮喘的疗效.方法 将74例咳嗽变异性哮喘患儿完全随机分为2组,对照组(36例)给予孟鲁司特钠口服；观察组(38例)在对照组的基
目的 比较应用帕瑞昔布钠超前镇痛的维吾尔族和汉族妇科患者开腹术后白细胞介素6(IL-6)和IL-10血清浓度.方法 60例行全身麻醉下择期妇科开腹手术的患者,按民族分为维吾尔族组
目的 评价腹腔镜手术治疗重型子宫内膜异位症的效果.方法 回顾性分析腹腔镜治疗38例重型子宫内膜异位症的手术时间、出血量、痛经症状的改善及复发率.结果 38例患者均成功地
介绍了5个主要的农业及相关学科的图书馆资源及其检索利用,国内最为完善的可以检索农业期刊馆藏的联合目录,和十几个可以利用的农业和相关学科的电子全文信息站点资源.
目的 观察妇科再造胶囊联合米非司酮治疗子宫肌瘤的临床效果.方法 将136例确诊为子宫肌瘤的患者完全随机分为观察组和对照组,各68例.对照组单独应用米非司酮,25 mg/d；观察组在
目的 探讨宫腔镜联合腹腔镜治疗输卵管性不孕症的方法与效果.方法 将我院诊治的150例输卵管性不孕症患者随机分为观察组(宫腔镜联合腹腔镜)(50例)、宫腔镜组(50例)与腹腔镜组
目的 探讨慢性乙型肝炎(CHB)患者接受阿德福韦酯抗病毒治疗前外周血CD4+、CD+25调节性T细胞(Treg细胞)水平与抗病毒远期临床疗效的关系.方法 选取具有抗病毒治疗适应证、核苷
提出一种基于流形学习的特征提取方法——鉴别最大间距准则.该方法采用线性投影,保留最优的局部和全局信息数据集.试图找到具有最好鉴别能力的原始信息,使类间离散度最大的同时类内离散尽可能的小.该方法在识别率上比其它方法都有较大提高,通过在YALE和JAFFE人脸库上的实验验证该方法的有效性.
目的 比较不同剂量地佐辛与0.15％罗哌卡因配伍在老年人术后硬膜外镇痛的应用效果及不良反应.方法 腰麻和硬膜外联合椎管内麻醉下经尿道前列腺电切术男性患者60例,按不同硬膜外
A key issue, which influences the applications of magnetic flux leakage testing, is defect quantification. There have been many research on the relationship bet