Topcon Positioning Systems, Inc.

Andrey Valeryevich Plenkin

Andrey Vladimirovich Veitsel

Mark Isaakovich Zhodzishsky

Sergey Vladislavovich Averin

Dmitry Pavlovich Nikitin

Viktor Abramovich Veitsel

Roman Anatolyevich Nevzorov

Vladimir Viktorovich Veitsel

Vyacheslav Viktorovich Lanovets

Andrey Andreevich Trofimov

Method for detecting motion of an object using GNSS signals, including (i) measuring distances between a GNSS antenna and GNSS satellites with carrier phases at a first time; (ii) computing distances between known positions of antenna and satellites at first time; (iii) for each satellite, calculating first set of residuals=distances in (i)−distances in (ii); (iv) measuring distances between antenna and satellites with carrier phases at a second time; (v) computing distances between known positions of antenna and satellites at second time; (vi) for each satellite, calculating second set of residuals=distances in (iv)−distances in (v); (vii) differencing first and second sets of residuals; (viii) computing a metric based on set of differences in (vii); (ix) comparing metric to a threshold; (x) based on comparison in (ix), determining if object moved or possibly moved between first time and second time.

Method and apparatus for GNSS-based motion detection

A navigation receiver operating in a differential navigation mode can change from one solution type to another. At each epoch, primary estimates of coordinates and the solution type are received. Each solution type has a corresponding accuracy. To improve the positioning quality when the solution type changes, smoothed estimates of coordinates are generated according to a two-branch algorithm. Two conditions are evaluated. If both conditions are satisfied, the current-epoch smoothed estimates of coordinates are set equal to the current-epoch extended estimates of coordinates calculated from the sum of the previous smoothed estimates of coordinates and coordinate increments calculated from carrier phases. If at least one of the conditions is not satisfied, updated smoothed estimates of coordinates are generated based on the sum of the current-epoch extended estimates of coordinates and a correction signal.

Positioning quality of global navigation satellite system receivers

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Moscow Rigion, Russia

Andrey Valeryevich Plenkin