| 摘要 |
Differential Global Positioning System receivers (60) are located at the corners of a confined zone and receive signals from Global Positioning System satellites (62). The Differential Global Positioning System receivers (60) aid an aircraft (16) to fly and flight path or combing patten (20) over the confined zone. A vehicle (12) with a trailer (14) may be used to transport the aircraft (16) for use over the confined zone. |
