公开(公告)号：US20170212245A1

公开(公告)日：2017-07-27

申请号：US15163489

申请日：2016-05-24

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Domenico DIGRAZIA

IPC: G01S19/30 ,  G01S19/34 ,  G01S19/24

CPC classification number: G01S19/30 ,  G01S19/24 ,  G01S19/243 ,  G01S19/34

Abstract: A Geostationary Earth Orbit (GEO) satellite belonging to a constellation of satellites of a BeiDou navigation system is acquired at a GNSS receiver. The acquisition includes finding the edge of a data bit in a signal carrying a data stream of a given satellite in order to start a locked tracking phase and demodulating said data stream of the GEO satellite. Detecting the edge of the data bit includes performing at the GNSS receiver a coherent power accumulation over a constant data cycle, starting from two respective possible initial positions in the sequence of data. Detecting the edge of the data bit also includes computing a tracking ratio parameter as the ratio of the two coherent power accumulations multiplied by a constant value.

公开(公告)号：US20180329069A1

公开(公告)日：2018-11-15

申请号：US15980221

申请日：2018-05-15

Applicant: STMicroelectronics S.r.l.

Inventor： Domenico DIGRAZIA ,  Fabio PISONI

IPC: G01S19/23 ,  G01S19/29

CPC classification number: G01S19/23 ,  G01S19/235 ,  G01S19/29

Abstract: A Global Navigation Satellite System (GNSS) receiver includes a Temperature Compensated Crystal Oscillator (TCCO) circuit. A micro jump of the TCCO circuit is detected by monitoring wide band phase values and carrier to noise ratio estimate values for each tracking channel of the tracking modules for the GNSS receiver. In response to a detected micro-jump, a frequency correction is calculated and applied to numerically controlled oscillators of phase/frequency lock loop circuits within tracking modules.