Patent ID: 8970430
Filing Date: 2015-03-03
Classification: G01S

Abstract:
1. An auxiliary positioning method, applied to a portable electronic device operative in a wireless communication network system and a satellite positioning system, for determining a current position information of the portable electronic device when the portable device can no longer determine position information from the satellite positioning system, the auxiliary positioning method comprising steps of: generating current signal information from at least two base stations with the strongest two signal strengths as received at the portable electronic device, wherein the current signal information includes base station numbers and respective signal strength of the at least two base stations; obtaining a plurality of track records including the at least two base stations by searching a track record database according to the current signal information, wherein the track record database includes a plurality of track records, and each of the track records includes previous signal information and reference position information determined from the satellite positioning system; and calculating the current position information according to the track records, wherein calculating the current position information comprises: establishing a first reference position defined by an intersection point of an arc of a first circle having a first radius and a first line segment passing through a first known position and a second known position of the portable electronic device with respect to a first one of the at least two base stations; establishing a second reference position defined by an intersection point of an arc of a second circle having a second radius and a second line segment passing through the second known position and a third known position of the portable electronic device with respect to a second one of the at least two base stations; and determining the current position based on an intersection between (1) a first tangent line tangent to the first circle and passing through the first reference position and (2) a second tangent line tangent to the second circle and passing through the second reference position.