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    ADAPTIVE SYNCHRONIZATION ENHANCEMENT TECHNIQUE FOR SERIAL MODULATED WAVEFORMS
    2.
    发明授权
    ADAPTIVE SYNCHRONIZATION ENHANCEMENT TECHNIQUE FOR SERIAL MODULATED WAVEFORMS 有权

    公开(公告)号：EP1913705B1

    公开(公告)日：2018-09-05

    申请号：EP06849803.9

    申请日：2006-07-28

    申请人： Exelis Inc.

    发明人： RASMUSSEN, Donald, John

    IPC分类号： H04L7/04

    CPC分类号： H04L7/042

    摘要： Methods and apparatus for synchronization (SYNC) detection of a received serial offset quadrature pulse shaped waveform modulated by a symbol SYNC sequence are provided. The waveform is serially demodulated into a serial baseband signal and correlated in parallel with segments of the symbol SYNC sequence. Correlation strength estimates of each of the correlated output signals are computed and used to adjust a SYNC threshold level. The correlation strength estimates or the correlated output signals are combined and a peak is determined in the resulting signal. The peak in the resulting signal is compared to the SYNC threshold level to detect synchronization.

    Method and apparatus for cooperative communications between groups of communication units using a time reversed channel response
    3.
    发明公开
    Method and apparatus for cooperative communications between groups of communication units using a time reversed channel response 有权
    用于使用时间反转信道响应的通信单元组之间的协作通信的方法和装置

    公开(公告)号：EP2571214A3

    公开(公告)日：2017-05-31

    申请号：EP12183824.7

    申请日：2012-09-11

    申请人： Exelis Inc.

    发明人： Lu, Ning Hsing

    IPC分类号： H04L25/02

    CPC分类号： H04L25/0226 ,  H04L25/0212

    摘要： Enhanced reception in a communication system is achieved by applying a time domain generated time-reversed channel response to signals transmitted from a group of transmitter to a group of receivers. The time-reversed channel response is generated from a radio frequency channel response derived from signals previously received from the group of receivers, but reversed in the time domain. The time-reversed channel response is convolved with an information signal that when transmitted in a coordinated fashion from the group of transmitters, the signals arrive at each receiver in the group of distant receiving communication devices at approximately the same time where the signals coherently combine, thereby increasing signal power at the receivers. This permits detection at a greater range or with a lower bit error rate. In addition, the many-to-many configuration enables signal power from each transmitter to be focused temporarily and spatially on each receiver.

    摘要翻译： 在通信系统中增强的接收是由施加时域而产生时间反转信道响应从一组发射器的反式mitted信号到一组接收器的实现。 时间反转的信道响应是从从所述组接收先前接收到的信号导出的无线频率信道响应生成，但在时域中反转。 时间反转的信道响应进行卷积与在信息信号并当从组发射机的以协调的方式传输时，信号在该基团远处接收通信设备中的每个接收器在大约相同的时间，其中的信号相干地组合到达， 从而在接收器的增加信号功率。 这允许在更大的范围内或具有更低的误码率检测。 此外，许多对许多配置从每个发射器被聚焦启用信号功率和暂时空间上的每个接收器。

    POINT CLOUD VISUALIZATION OF ACCEPTABLE HELICOPTER LANDING ZONES BASED ON 4D LIDAR
    8.
    发明公开
    POINT CLOUD VISUALIZATION OF ACCEPTABLE HELICOPTER LANDING ZONES BASED ON 4D LIDAR 有权
    PUNKTWOLKENVISUALISIERUNG VON AKZEPTABLEN HUBSCHRAUBERLANDEBEREICHEN AUF基于VON 4D-LIDAR

    公开(公告)号：EP2850455A1

    公开(公告)日：2015-03-25

    申请号：EP13716143.6

    申请日：2013-04-03

    申请人： Exelis Inc.

    发明人： MENDEZ-RODRIGUEZ, Javier ,  RODGERS, Christopher, T.

    IPC分类号： G01S17/89 ,  G01S17/93

    CPC分类号： G01S17/89 ,  G01S7/4802 ,  G01S17/88 ,  G01S17/933 ,  G08G5/025

    摘要： A processor calculates a safe landing zone for an aircraft. The processor executes the following steps: (a) converting 4D point cloud data into Cartesian coordinates to form a height map of a region; (b) segmenting the height map to form boundaries of an object in the region; and (c) determining maximum height within the boundaries of the object. Also included are (d) determining if the maximum height is greater than a predetermined height to form a vertical obstruction (VO) in the region; and (e) determining if the VO is in the line of sight (LOS) of the aircraft to classify the landing zone as safe or unsafe. The processor further includes the steps of: (f) forming a slope map over the height map, in which a slope of a pixel is based on 4-neighbors of the pixel of interest, and (g) determining roughness over the height map.

    摘要翻译： 处理器计算飞机的安全着陆区域。 处理器执行以下步骤：（a）将4D点云数据转换为笛卡尔坐标以形成区域的高度图; （b）分割高度图以形成区域内物体的边界; 和（c）确定物体边界内的最大高度。 还包括（d）确定最大高度是否大于预定高度以在该区域中形成垂直障碍物（VO）; 和（e）确定VO是否在飞机的视线（LOS）中，以将着陆区分类为安全或不安全。 处理器还包括以下步骤：（f）在高度图上形成斜率图。