公开(公告)号：WO0031888A9

公开(公告)日：2006-11-16

申请号：PCT/US9927749

申请日：1999-11-22

Applicant: NAVCOM TECH INC

Inventor： WOO RICHARD K T ,  QUAN JOSE O ,  CHENG UNJENG

IPC: G01S1/00 ,  G01S19/24 ,  G01S19/29 ,  G01S19/30 ,  G01S19/32 ,  G01S19/37 ,  H04B1/7085 ,  H04L27/00

CPC classification number: H04B1/7085 ,  G01S19/24 ,  G01S19/29 ,  G01S19/30 ,  G01S19/32 ,  G01S19/37

Abstract: A GPS receiver uses the energy of the L1 (221) and L2 (222) GPS satellite signals to track the phase of the L1 and L2 P-code and the carrier phase of the L2 signal. The in-phase channel of the L1 signal is correlated with the P-code (316) from a P-code generator (303) in the L1 channel of the receiver. Similarly, the in-phase and quadrature channels of the received L2 P-code signal are correlated with the P-code (357, 358) in the receiver L2 channel. Polarity transitions between the two W-bits over the I & D integration (310, 311) period are detected by a threshold comparison (320) with the I & D output of the L1 punctual P-code correlation signal (312). When there is polarity change, the L1 and L2 I & D outputs are not used for L2 carrier demodulation. Otherwise, the I & D output of the L1 in-phase Punctual P-code correlation (312) is combined (347) with the L2 in-phase Punctual P-code correlation (337) in accordance with the L1 and L2 signal power ratio. This summed signal (347) is multiplied (348) with the I & D output of the L2 quadrature channel early-late P-code correlation (338) to obtain a product signal that provides an estimate of the L2 carrier phase.

Abstract translation: GPS接收机使用L1（221）和L2（222）GPS卫星信号的能量来跟踪L1和L2 P码的相位以及L2信号的载波相位。 L1信号的同相信道与来自接收机的L1信道中的P码发生器（303）的P码（316）相关。 类似地，接收的L2P码信号的同相和正交信道与接收机L2信道中的P码（357,358）相关。 通过与L1准时P码相关信号（312）的I＆D输出的阈值比较（320）来检测在I＆D积分（310,311）周期之间的两个W位之间的极性转换。 当有极性变化时，L1和L2 I＆D输出不用于L2载波解调。 否则，根据L1和L2信号功率比，将L1同相准时P码相关（312）的I＆D输出与L2同步准点P码相关（337）组合（347） 。 将该求和信号（347）与L2正交信道提前P码相关（338）的I＆D输出相乘（348）以获得提供L2载波相位的估计的乘积信号。