Patent ID: 9188668
Filing Date: 2015-11-17
Classification: G01S

Abstract:
1. A method, comprising: transmitting, from a cellular communications device, an impulse signal; receiving, at multiple antennas of the cellular communications device, multiple reflections of the impulse signal; storing, in a memory of the cellular communications device, a database of reflection profiles that associates different electromagnetic reflection characteristics to global positioning system coordinates of different locations; determining, by the cellular communications device, a null entry in the database of reflection profiles for the global positioning system coordinates representing a current location; determining, by the cellular communications device, a reflection profile from the multiple reflections of the impulse signal; replacing, by the cellular communications device, the null entry in the database of reflection profiles with the reflection profile determined from the multiple reflections of the impulse signal; and associating, by the cellular communications device, the reflection profile to the global positioning system coordinates representing the current location of the cellular communications device.