Determination of the transmission time of a signal part in a positioning system,申请号US20030402340-传众专利搜索

Determination of the transmission time of a signal part in a positioning system

申请公布号：US2004027281(A1)

申请号：US20030402340

申请日期：2003.03.27

申请公布日期：2004.02.12

申请人：

NOKIA CORPORATION

发明人：AKOPIAN DAVID;VALIO HARRI

分类号：G01S1/00;(IPC1-7):G01S1/24

主分类号：G01S1/00

摘要：The invention relates to a method for determining the time of transmission of a signal part of a code modulated signal transmitted by a beacon of a positioning system and received by a receiver of the positioning system. In order to enable such a determination in weak signal conditions, it is proposed that measured subcomponents of the time of transmission of at least two signal parts are compared with corresponding predicted subcomponents in a way resulting in a combined difference for all signal parts. The comparison is performed for a plurality of assumed errors in the predicted subcomponent. The accurate time of transmission of a signal part is then determined based on the determined error value which results in the smallest combined difference. The invention relates equally to a corresponding receiver and to a corresponding positioning system.