Patent ID: 9298991
Filing Date: 2016-03-29
CPC Classification: B62D,E01C,F16M,G01C,G06K

Claim Text:
1. An apparatus for determining a geographical location of a roadway mark from a moving vehicle, the apparatus comprising: a GPS antenna mounted to a vehicle; a GPS receiver responsive to the GPS antenna and configured to (a) determine a first time-tagged geographical location of the GPS antenna and a second time-tagged geographical location of the GPS antenna, and (b) generate a first periodic signal having a known time of occurrence and a first frequency; a synchronization system responsive to the GPS receiver configured to generate a second periodic signal that (a) has a known time of occurrence, (b) is synchronized to the first periodic signal and (c) has a second frequency equal to an integer multiple of the first frequency; a first imager mounted to the vehicle, wherein the first imager is (a) synchronously responsive to and triggered by the second periodic signal and (b) configured to image a first roadway mark to provide a first triggered roadway mark image; and a computer (a) responsive to the GPS receiver and the first imager and (b) configured to determine a GPS location of the first roadway mark using positional interpolation based on the first time-tagged geographical location, the second time-tagged geographical location, and the first triggered roadway mark image.