ID 原文 译文
4393 首先，采用标记分水岭算法对 SAR 幅度影像进行去陆操作； Firstly, the marker-based watershed algorithm was employed to remove land from SAR ampli-tude image.
4394 其次，利用基于对数正态分布的恒虚警率算法，得到去陆 SAR 影像的候选目标； Then, the CFAR algorithm based on log-normal distribution was used to obtain candidate targets from noland image.
4395 再次，提取候选目标的长宽比、舰船面积和对比度 3 个特征； Furthermore, the length to width ratio, the ship area and the contrast ratio of the candidate targets were ex-tracted.
4396 最后，提出变异系数法对 3 个特征进行权重分配，并结合候选目标的归一化特征矢量计算其特征置信度，再确定最佳置信度，去除候选目标中的虚警目标，优化舰船检测结果。 Finally, a variance coefficient method was proposed to distribute the weight of the three features, and the confi-dence levels were calculated by combining the normalized feature vectors of the candidate targets with the feature weight.By determining the best confidence level, false alarm targets among the candidate targets were removed to optimize shipdetection results.
4397 为了验证所提方法，选取不同复杂场景的高分三号 SAR 影像进行舰船检测实验。 In order to verify the proposed method, experiments were carried on with the GF-3 SAR images of dif-ferent complex scenes.
4398 实验结果表明，所提方法具有可行性和有效性。 The experimental results show that the proposed method is feasible and effective.
4399 为减少控制帧消耗，降低系统接入时延，提出了预约式门限服务轮询接入（SGPA）策略，将站点接入时刻缓存区中的排队数据整合为数据集，对数据集进行统一发送和确认。 Aim to reduce control frames consumption and improve the delay performance, a scheduled gated-service pol-ling access (SGPA) mechanism was proposed, in which the total data packets in the buffer at the polling instant were ag-gregated into a data set, that was transmitted and acknowledged uniformly.
4400 针对 RoF-DAS 架构下 WLAN 差错重传机制与网络接入性能的定量关系进行分析，建立了具有内部数据的门限服务轮询（IAGP）排队模型，利用轮询系统中内部数据的到达和服务过程描述数据差错重传机制， Then, an inner-arrival gated-service polling(IAGP) model was proposed to analyze the quantitative relationship between failure retry mechanism and network accessperformance of the wireless local area network (WLAN) in RoF-DAS. The failure retry mechanism were modeled as thearrival and service process of inner customers in IAGP.
4401 然后基于马尔可夫链和概率母函数方法推导出站点数据时延性能与重传次数、重传概率等参数的定量关系表达式。 Using the Markov chain and generating function method, theclosed-form expressions for the quantitative relationship between delay performance and retrial parameters, such as retrytimes, and the probability of retransmission, were achieved.
4402 仿真实验结果表明，SGPA 与典型 IEEE 802.11 PCF相比有效降低了接入时延； The simulation results show that the proposed SGPA canachieve a lower delay than IEEE 802.11,