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Calibration method of a local oscillator on a mobile gps receiver, and mobile gps receiver

机译：移动gps接收机上的本地振荡器的校准方法及移动gps接收机

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摘要

A GPS receiver in one embodiment includes an antenna which receives GPS signals at an RF frequency from in view satellites; a downconverter coupled to the antenna for reducing the RF frequency of the received GPS signals to an intermediate frequency (IF); a digitizer coupled to the downconverter and sampling the IF GPS signals at a predetermined rate to produce sampled IF GPS signals; a memory coupled to the digitizer storing the sampled IF GPS signals (a snapshot of GPS signals); and a digital signal processor (DSP) coupled to the memory and operating under stored instructions thereby performing Fast Fourier Transform (FFT) operations on the sampled IF GPS signals to provide pseudorange information. These operations typically also include preprocessing and post processing of the GPS signals. After a snapshot of data is taken, the receiver front end is powered down. The GPS receiver in one embodiment also includes other power management features and includes, in another embodiment the capability to correct for errors in its local oscillator which is used to sample the GPS signals. The calculation speed of pseudoranges, and sensitivity of operation, is enhanced by the transmission of the Doppler frequency shifts of in view satellites to the receiver from an external source, such as a basestation in one embodiment of the invention.

机译：在一个实施例中的GPS接收机包括：天线，其从视野中的卫星接收RF频率的GPS信号;以及天线。与天线耦合的下变频器，用于将接收到的GPS信号的RF频率降低到中频（IF）;数字转换器，其耦合到下变频器并以预定速率对IF GPS信号进行采样以产生采样的IF GPS信号;耦合到数字转换器的存储器，其存储采样的IF GPS信号（GPS信号的快照）;数字信号处理器（DSP）耦合到存储器并在存储的指令下运行，从而对采样的IF GPS信号执行快速傅里叶变换（FFT）操作以提供伪距信息。这些操作通常还包括GPS信号的预处理和后处理。拍摄数据快照后，接收机前端将关闭电源。一个实施例中的GPS接收机还包括其他功率管理特征，并且在另一实施例中包括校正其本地振荡器中的误差的能力，该本地振荡器用于对GPS信号进行采样。通过将视点卫星的多普勒频移从外部源（例如，本发明的一个实施例中的基站）传输到接收器，提高了伪距的计算速度和操作的灵敏度。

著录项

公开/公告号BRPI9613030B1

专利类型
公开/公告日2017-03-28

原文格式PDF
申请/专利权人 SNAPTRACK INC.;
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申请/专利号BR19969613030
发明设计人 NORMAN F. KRASNER;
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申请日1996-10-08
分类号G01S1/04;G01S1;G01S1/02;G01S5;G01S19/05;G01S19/08;G01S19/09;G01S19/13;G01S19/23;G01S19/24;G01S19/25;G01S19/28;G01S19/29;G01S19/30;G01S19/34;G01S19/46;G06F1;H01Q1/27;H01Q21/28;H03D7/16;H03J7/04;H03J7/06;H04B1;H04B1/28;H04B1/38;
国家 BR
入库时间 2022-08-21 13:39:42

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