Patent ID: 8473205
Filing Date: 2013-06-25
Classification: G01S,H04B

Abstract:
1. A method of searching for position determination signals using a plurality of progressively more sensitive search modes with sensitivity levels that are characterized by their respective integration periods and which plurality comprises, in order of increasing sensitivity, a first level mode, a second level mode, and a third level mode, the method comprising: performing, on a wireless subscriber station, a first level search associated with a first integration period as part of a position fix attempt of the wireless subscriber station; deriving, on the wireless subscriber station, one or more measurements from the ensuing search results; determining, on the wireless subscriber station, whether the measurements satisfy one or more selected measurement sufficiency criteria; avoiding additional searching within the position fix attempt if the wireless subscriber station determines that the measurements satisfy the one or more selected measurement sufficiency criteria; and performing, on the wireless subscriber station, a higher level search beyond the first level search if the wireless subscriber station determines that the measurements do not satisfy the one or more selected measurement sufficiency criteria, wherein: