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1. 发明申请

WO0216960A8 APPARATUS FOR REDUCING AUTO-CORRELATION OR CROSS-CORRELATION IN WEAK CDMA SIGNALS 审中-公开
标题翻译：减少CDMA信号中的自相关或交叉相关的装置
公开(公告)号：WO0216960A8
公开(公告)日：2002-07-11
申请号：PCT/US0123078
申请日：2001-07-20
申请人： SIRF TECH INC
发明人： TURETZKY GREGORY BRET , NORMAN CHARLES P , FALK HENRY D
IPC分类号： G01S19/09 , G01S1/00 , G01S5/00 , G01S19/21 , G01S19/25 , G01S19/26 , G01S19/30 , G01S19/37 , H04B1/707 , H04B1/7075 , H04B1/708 , H04B1/7085 , H04B1/709 , H04B1/7097 , H04Q7/38 , G01S1/04 , G01S5/14
CPC分类号： G01S19/37 , G01S5/0027 , G01S5/0036 , G01S19/09 , G01S19/21 , G01S19/25 , G01S19/26 , G01S19/30 , H04B1/7075 , H04B1/70755 , H04B1/708 , H04B1/7085 , H04B1/709 , H04B1/7097 , H04B2201/70715
摘要： The present invention discloses methods, apparatuses, and systems for eliminating auto- and cross-correlation in weak signal CDMA systems, such as GPS systems. The invention uses parallel data paths that allow standard correlation of signals in parallel with verification of the lock signal to determine whether the system has locked onto the proper signal within the scanned signal window. The invention can be made with multiple CPUs, a single CPU with dual input modes, on multiple IC chips, or as a single IC chip solution for small, low cost reception, downconversion, correlation, and verification systems.
摘要翻译：本发明公开了用于消除诸如GPS系统的弱信号CDMA系统中的自相关和互相关的方法，装置和系统。本发明使用并行数据路径，其允许信号与锁定信号的验证并行地进行标准相关，以确定系统是否锁定在扫描信号窗口内的适当信号上。本发明可以由多个CPU，具有双重输入模式的单个CPU，多个IC芯片构成，或者作为用于小型，低成本接收，下变频，相关和验证系统的单个IC芯片解决方案。

2. 发明申请

WO0147171A3 STRONG SIGNAL CANCELLATION TO ENHANCE PROCESSING OF WEAK SPREAD SPECTRUM SIGNAL 审中-公开
标题翻译：强信号消除以加强弱扩展频谱信号的处理
公开(公告)号：WO0147171A3
公开(公告)日：2001-11-15
申请号：PCT/US0042171
申请日：2000-11-14
申请人： SIRF TECH INC
发明人： NORMAN CHARLES P , CAHN CHARLES R
IPC分类号： G01S1/00 , H04B1/7107 , H04J13/04 , G01S3/16 , G01S13/00
CPC分类号： H04B1/7107 , G01S19/21 , G01S19/246 , G01S19/30
摘要： A CDMA coded, spread spectrum radio signal containing a strong signal and a weak signal is received, and the interference of the strong signal with the weak signal is computed to enhance the ability to track the weak signal. The codes modulating both signals are known, and the weak signal can be predicted. The interference of the strong signal is calculated (50) as the product of the amplitude of the strong signal and the predicted crosscorrelation of the strong signal with the weak signal (40). The strong signal may be measured, predicted, or acquired through a combination of both methods (10). The crosscorrelation may be predicted for a range of weak signal values, and the weak signal selected as the prediction producing the greatest received power (60).
摘要翻译：接收包含强信号和弱信号的CDMA编码的扩频无线电信号，并计算强信号与弱信号的干扰，以增强跟踪弱信号的能力。调制两个信号的码是已知的，并且可以预测弱信号。计算强信号的干扰（50）作为强信号的幅度与强信号与弱信号的预测互相关的乘积（40）。可以通过两种方法（10）的组合来测量，预测或获取强信号。可以针对弱信号值的范围预测互相关，并且选择作为产生最大接收功率的预测的弱信号（60）。

3. 发明申请

WO0201243A3 COMBINED PARALLEL AND SEQUENTIAL DETECTION FOR GPS SIGNAL ACQUISITION 审中-公开
标题翻译：用于GPS信号获取的组合并行和顺序检测
公开(公告)号：WO0201243A3
公开(公告)日：2002-04-04
申请号：PCT/US0119857
申请日：2001-06-20
申请人： SIRF TECH INC
发明人： NORMAN CHARLES P , ROUNDS STEPHEN F
IPC分类号： G01S1/00 , G01S19/30 , G01S19/37 , H04B1/707 , H04B1/7077 , H04B1/709 , H04B15/00 , H04K1/00 , H04L27/30
CPC分类号： H04B1/70775 , G01S19/29 , G01S19/30 , G01S19/37 , H04B1/709
摘要： A two part signal acquisition process includes a parallel signal detection process and signal verification/false alarm rejection process. A massively parallel architecture of acquisition correlators (14) search a large region of time-frequency uncertainty during the parallel signal detection process to identify the most likely detections for each search dwell. Concurrent with the parallel signal detection process performed by the acquisition correlators (14), the current list of most likely detections (16) is examined with additional search dwells in the verification/false alarm rejection process. The verification/false alarm rejection (12) process is performed by a plurality of independent correlators or tracking channels (18). Under software control, the tracking channels perform repeated dwells on the most likely detections until they can be dismissed as false alarms or verified as the desired signal.
摘要翻译：两部分信号采集过程包括并行信号检测过程和信号验证/误报警拒绝过程。采集相关器的大规模并行架构（14）在并行信号检测过程中搜索大范围的时频不确定性，以识别每个搜索驻留的最可能的检测。与采集相关器（14）执行的并行信号检测处理同时，在验证/错误报警拒绝处理中用附加搜索驻留来检查当前最可能的检测列表（16）。由多个独立相关器或跟踪通道（18）执行验证/假警报抑制（12）处理。在软件控制下，跟踪通道对最可能的检测器执行重复停留，直到它们被解除为假警报或被验证为所需信号。

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