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    • 27. 发明授权
    • CDMA geolocation system
    • CDMA地理定位系统
    • US06665332B1
    • 2003-12-16
    • US09392965
    • 1999-09-09
    • John P. CarlsonThomas B. GravelyMark C. Sullivan
    • John P. CarlsonThomas B. GravelyMark C. Sullivan
    • H04B1713
    • G01S5/0221G01S5/06G01S5/14G01S11/02H04B1/70757H04B1/7077H04B2201/70715
    • A geolocation system for geolocating a mobile transceiver operating in a CDMA communication system is disclosed having improved time of arrival extraction which allows the extracting of time of arrival information of weak CDMA emissions. The improved time of arrival extraction is accomplished by breaking the received CDMA emission into M identical processing stages. Each stage performs despreading/demodulating at over sampled chip offsets from the next processing stage. The P-point fast Fourier transform of the M stages is taken and in effect a two dimensional time versus frequency cross ambiguity function is created. The peak of the function may be interpolated to create an accurate estimate of the time of arrival of the emission from the mobile transceiver, thus improving the accuracy of time of arrival measurements and adjusting for doppler frequency shifts that may otherwise corrupt the measurements when integrating over a long period of time.
    • 公开了一种用于对在CDMA通信系统中操作的移动收发机进行地理定位的地理定位系统,其具有改进的到达时间提取,其允许提取弱CDMA发射的到达时间信息。 改进的到达提取时间是通过将接收到的CDMA发射分解成M个相同的处理阶段来完成的。 每个阶段在下一个处理阶段的过采样芯片偏移处执行解扩/解调。 采用M级的P点快速傅里叶变换,实际上产生了二维时间与频率交叉模糊函数。 可以对功能的峰值进行内插,以创建来自移动收发器的发射的到达时间的精确估计,从而提高到达时间测量的准确性并调整多普勒频移,否则可能会在整合时破坏测量 很长一段时间。