Abstract: A modified scooter that has a frame with a low center portion. A rider stands on this center portion. A front wheel is mounted to a fork and has steering control as in the case of a normal scooter. Extending forward from the frame is a curved tow member. The curved tow member acts as a transfer bow. It is designed to fasten to a tow rope, which is then attached to a dog or dogs. The position and attachment point of the transfer bow are designed to transfer the pulling force to a point low on the center of gravity of the scooter. This keeps the scooter stable under all operating conditions. The scooter can be a hauling sled also. By lengthening the frame and adding additional wheels, the scooter can carry loads. The transfer bow can be attached to other types of wheeled vehicles as well to achieve similar results.

Abstract: The effect of changing satellite geometry on the achievable accuracy of GPS relative positioning under the full GPS constellation has been researched. A mathematical model has been developed for the quantitative analysis of the accuracy of GPS relative positioning with respect to the changing satellite/station configuration, observation starting time and session length. A method based on modeling the relative dilution of precision (RDOP) has been developed for the optimum design of GPS relative positioning with carrier phase observable. The RDOP surface, a mathematical surface, has been generated based on the broadcast almanac file. The optimum observation windows, optimum session starting time and optimum observation session length have been derived from the study of the RDOP surface.The method and mathematical model based on the RDOP are compared with those based on the PDOP (position dilution of precision) for application purposes.

Abstract: A system for correlating electronic distance measurement and aerial photography where an airborne electronic location station is photographed as it passes over an area to be surveyed. The position of the airborne station is precisely measured as it moves and this information is included in the final image processing.