Patent ID: 8330652

Claim:
A method comprising: with a satellite positioning system (SPS) receiver enabled device: generating one or more electronic signals representing pseudorange (PR) predicted information associated with a plurality of space vehicles (SVs) associated with said SPS based, at least in part, on current estimated position information associated with the device, wherein said current estimated position is based, at least in part, on PR measurement information associated with said plurality of SVs, and wherein said PR measurement information is based, at least in part, on previously estimated position information associated with the device and recently detected SPS signal code peak information; determining whether said current estimated position information is valid based, at least in part, on said PR measurement information and said PR predicted information, wherein determining whether said current estimated position information is valid includes obtaining a sum-of-squares of an a-posteriori measurement residual associated with said PR measurement information and said PR predicted information; and in response to determining that said current estimated position information is valid, using said current estimated position information to support at least one navigation service associated with the device.