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    • 14. 发明授权
    • Systems and methods for determining position using light sources
    • 使用光源确定位置的系统和方法
    • US08411258B2
    • 2013-04-02
    • US12975451
    • 2010-12-22
    • Richard D. RobertsPraveen Gopalakrishnan
    • Richard D. RobertsPraveen Gopalakrishnan
    • G01C3/08
    • G01S5/16
    • A positioning system and method for determining a coordinate of an object may comprise a positioning transmitter system and a positioning receiver system. The positioning transmitter system includes at least four light sources and a master anchor to modulate the light sources to emit modulated light signals each having a modulation frequency. The positioning receiver system comprises a lens to focus the light signals onto an optical sensor, an envelope detector to receive a signal from the optical sensors and provide output signals corresponding to the modulation frequency, and positioning detection circuitry. The positioning detection circuitry receives calibration data; determines at least four phase difference of arrival (PDOA) pairs based on the output signals from the envelope detector; determines at least four phase corrected PDOA pairs based on the calibration data and the PDOA pairs; determines at least four linear distance differences based on the phase corrected PDOA pairs; and determines the coordinate of the object based on the linear distance differences and the calibration data.
    • 用于确定对象的坐标的定位系统和方法可以包括定位发射机系统和定位接收机系统。 定位发射机系统包括至少四个光源和主锚,以调制光源以发射各自具有调制频率的调制光信号。 定位接收器系统包括将光信号聚焦到光学传感器上的透镜,包络检测器,用于接收来自光学传感器的信号并提供对应于调制频率的输出信号和定位检测电路。 定位检测电路接收校准数据; 基于来自包络检测器的输出信号确定至少四个相位差到达(PDOA)对; 基于校准数据和PDOA对确定至少四个相位校正的PDOA对; 基于相位校正的PDOA对确定至少四个线性距离差; 并且基于线性距离差和校准数据确定对象的坐标。
    • 19. 发明授权
    • Methods and arrangements for generating a waveform for frequency shift keying communications
    • 用于生成用于频移键控通信的波形的方法和装置
    • US09461752B2
    • 2016-10-04
    • US13539351
    • 2012-06-30
    • Richard D. RobertsPraveen GopalakrishnanMathys C. Walma
    • Richard D. RobertsPraveen GopalakrishnanMathys C. Walma
    • H04L27/10H04B10/556H04B10/116
    • H04B10/5563H04B10/116H04B10/502H04L27/04H04L27/12
    • Embodiments may provide a way of communicating via an electromagnetic radiator, or light source, that can be amplitude modulated such as light emitting diode (LED) lighting and receivers or detectors that can determine data from light received from the amplitude modulated electromagnetic radiator. Some embodiments may provide a waveform in the form of chips at a chipping clock frequency that switch a light source between on and off states to communicate via light sources that can be amplitude modulated such as LED lighting. Some embodiments may provide a method of transmitting the waveform via modulated LED lighting. Some embodiments are intended for indoor navigation via photogrammetry (i.e., image processing) using self-identifying LED light anchors. In many embodiments, the data signal may be communicated via the light source at amplitude modulating frequencies such that the resulting flicker is not perceivable to the human eye.
    • 实施例可以提供通过可以被调幅的电磁辐射器或光源(例如发光二极管(LED)照明)和可以从从调幅电磁辐射器接收的光确定数据的接收器或检测器进行通信的方式。 一些实施例可以以切片时钟频率提供以切片时钟频率的芯片形式的波形,该光纤切换状态之间的光源通过可被调幅的光源(例如LED照明)进行通信。 一些实施例可以提供通过经调制的LED照明来发送波形的方法。 一些实施例旨在通过使用自识别LED光锚的摄影测量(即,图像处理)进行室内导航。 在许多实施例中,可以以幅度调制频率通过光源传送数据信号,使得所得到的闪烁对人眼不能察觉。