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    • 3. 发明申请
    • Method and System for Ultrasonic Signaling, Ranging and Location Tracking
    • 超声信号,测距和位置跟踪方法与系统
    • US20140192622A1
    • 2014-07-10
    • US14152665
    • 2014-01-10
    • CARNEGIE MELLON UNIVERSITY, Center for Technology Transfer and Enterprise Creation
    • Anthony RowePatrick Lazik
    • G01S5/18
    • G01S5/18G01S1/725G01S1/74G01S5/0036G01S5/28
    • An indoor ultrasonic location tracking system that can utilize standard audio speakers to provide indoor ranging information to modern mobile devices like smartphones and tablets. The method uses a communication scheme based on linearly increasing frequency modulated chirps in the audio bandwidth just above the human hearing frequency range where mobile devices are still sensitive. The method uses gradual frequency and amplitude changes that minimize human perceivable (psychoacoustic) artifacts derived from the non-ideal impulse response of audio speakers. Chirps also benefit from Pulse Compression, which improves ranging resolution and resilience to both Doppler shifts and multi-path propagation that plague indoor environments. The method supports the decoding of multiple unique identifier packets simultaneously. A Time-Difference-of-Arrival pseudo-ranging technique allows for localization without explicit synchronization with the broadcasting infrastructure. An alternate received signal strength indicator based localization technique allows less accurate localization at the benefit of sparser transmission infrastructure.
    • 一个室内超声波位置跟踪系统,可以利用标准音频扬声器为现代移动设备(如智能手机和平板电脑)提供室内测距信息。 该方法使用基于在移动设备仍然敏感的人类听力频率范围之上的音频带宽中线性增加的频率调制啁啾的通信方案。 该方法使用逐渐的频率和幅度变化,其最小化从音频扬声器的非理想脉冲响应导出的人类可感知(心理声学)伪影。 啁啾也受益于脉冲压缩,其提高了测距分辨率和对多普勒频移以及困扰室内环境的多径传播的弹性。 该方法同时支持多个唯一标识符包的解码。 到达时间差距伪距技术允许本地化而不与广播基础设施明确同步。 基于替代的基于信号强度指示器的定位技术允许较少的精确定位,从而可以实现更轻松的传输基础设施。