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1. 发明授权

US06567486B1 Apparatus and method for finding location of a mobile unit 有权
标题翻译：用于查找移动单元的位置的装置和方法
公开(公告)号：US06567486B1
公开(公告)日：2003-05-20
申请号：US09360574
申请日：1999-07-26
申请人： Alexander Gordon , Alex Matusevich , Jonathan Tobias , Sheng-Jen Tsai , Robert C. Wang
发明人： Alexander Gordon , Alex Matusevich , Jonathan Tobias , Sheng-Jen Tsai , Robert C. Wang
IPC分类号： H04L702
CPC分类号： G01S5/10 , G01S1/045
摘要： A phase-modulated signal such as a quadrature phase-shift-keyed (QPSK) signal in a wireless communication system is demodulated by frequency demodulating the phase-modulated signal. The phase-modulated signal is separated into first and second copies, the first copy is phase demodulated to generate demodulated symbols, and the second copy is frequency demodulated to generate, e.g., a measure of the instantaneous frequency of the phase-modulated signal. The instantaneous frequency measure is processed to identify one or more symbol transitions, and the identified transitions are used to generate event signals having signature properties (signature events). These signature events are used in traditional Time Difference of Arrival tdoa algorithms to accurately determine position of a mobile unit in the wireless communication system.
摘要翻译：通过频率解调相位调制信号来解调无线通信系统中的相位调制信号，例如正交相移键控（QPSK）信号。相位调制信号被分离为第一和第二副本，第一副本被相位解调以产生解调符号，并且第二副本被频率解调以产生例如相位调制信号的瞬时频率的测量。处理瞬时频率测量以识别一个或多个符号转换，并且所识别的转换用于生成具有签名属性（签名事件）的事件信号。这些签名事件用于传统的到达时差算法，以准确地确定移动单元在无线通信系统中的位置。

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