Precision equivalent landing system using gps and an altimeter

• US 5,820,080 A
• Filed: 03/14/1996
• Issued: 10/13/1998
• Est. Priority Date: 03/14/1996
• Status: Expired due to Term

• Current Assignee: Trimble Navigation Limited (Trimble Inc.)
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: Eschenbach, Ralph F.
• Primary Examiner(s): Barefoot, Galen L.
• Application Number:
  US08/615,837
• Time in Patent Office: 943 Days
• Field of Search: 244/183-189, 244/194-195, 340/977, 340/972, 342/397, 455/53.1, 701/16-18, 701/213-216
• US Class Current: 244/183
• CPC Class Codes: G05D 1/0676 specially adapted for landing

Abstract

A precision equivalent landing system. In one embodiment, a position determining system is coupled to an aircraft. The position determining system generates lateral position information of the aircraft with respect to a landing approach path. An altimeter is also coupled to the aircraft. The altimeter generates vertical position information of the aircraft with respect to the landing approach path. A graphic display disposed within the aircraft concurrently displays a visual representation of the lateral position of the aircraft with respect to the landing approach path and the vertical position of the aircraft with respect to the landing approach path. In so doing, the present invention provides both relative position and altitude of an incoming aircraft with respect to a landing approach path. Thus, the present invention provides a precision equivalent landing system without requiring the equipment and expense associated with ILS or FAA MLS precision landing systems.

Claims

1. A precision equivalent landing system comprising:

a position determining system adapted to be coupled to an aircraft, said position determining system generating lateral position information of said aircraft with respect to a landing approach path;

an altimeter adapted to be coupled to said aircraft, said altimeter adapted to generate vertical position information of said aircraft with respect to said landing approach path, said altimeter adapted to provide said vertical position information without receiving second vertical position information from said position determining system; and

a graphic display adapted to be disposed within said aircraft for concurrently displaying a visual representation of said lateral position of said aircraft with respect to said landing approach path and said vertical position of said aircraft with respect to said landing approach path, wherein said precision equivalent landing system provides said visual representation of said lateral position of said aircraft with respect to said landing approach path and said vertical position of said aircraft with respect to said landing approach path without requiring ground-based infrastructure at or near said landing approach path.

2. The precision equivalent landing system of claim 1 wherein said position determining system is a satellite-based radio navigation system.

3. The precision equivalent landing system of claim 2 wherein said satellite-based radio navigation system consists of the Global Positioning System.

4. The precision equivalent landing system of claim 2 wherein said satellite-based radio navigation system consists of the Global Orbiting Navigation System.

5. The precision equivalent landing system of claim 1 wherein said position determining system further includes:

a signal receiver; and

a signal processor having an input coupled to said signal receiver, said signal processor generating said lateral position information of said aircraft with respect to said landing approach path from signals received at said input from said signal receiver, said signal processor having an output coupled to said graphic display, said output providing said lateral position information of said aircraft with respect to said landing approach path from said signal processor to said graphic display.

6. The precision equivalent landing system of claim 1 wherein said altimeter is comprised of a baro-altimeter.

7. A precision equivalent aircraft landing method comprising the steps of:

generating lateral position information of an aircraft with respect to a landing approach path, said lateral position information determined by a position determining system coupled to said aircraft;

generating vertical position information of said aircraft with respect to said landing approach path, said vertical position information generated by an altimeter coupled to said aircraft, said altimeter adapted to provide said vertical position information of without receiving second vertical position information from said position determining system; and

concurrently displaying, on a graphic display disposed within said aircraft, a visual representation of said lateral position of said aircraft with respect to said landing approach path and said vertical position of said aircraft with respect to said landing approach path, wherein said precision equivalent aircraft landing method provides said visual representation of said lateral position of said aircraft with respect to said landing approach path and said vertical position of said aircraft with respect to said landing approach path without requiring ground-based infrastructure at or near said landing approach path.

8. The precision equivalent aircraft landing method as recited in claim 7 wherein said step of generating lateral position information of said aircraft further includes generating said lateral position information of said aircraft using a satellite-based radio navigation position determining system.

9. The precision equivalent aircraft landing method as recited in claim 8 wherein said step of generating lateral position information of said aircraft using a satellite-based radio navigation position determining system further includes the step of generating said lateral position information of said aircraft using the Global Positioning System.

10. The precision equivalent aircraft landing method as recited in claim 8 wherein said step of generating lateral position information of said aircraft with respect to said landing approach path using a satellite-based radio navigation position determining system further includes the step of generating said lateral position information of said aircraft using the Global Orbiting Navigation System.

11. The precision equivalent aircraft landing method as recited in claim 7 wherein said step of generating lateral position information of said aircraft with respect to said landing approach path further includes the steps of:

receiving radio navigation signals at a signal receiver of said position determining system,

processing said radio navigation signals using a signal processor of said position determining system to generate said lateral position information of said aircraft with respect to said landing site, said radio navigation signals received from said signal receiver at an input of said signal processor; and

providing said lateral position information of said aircraft with respect to said landing approach path to said graphic display via an output of said signal processor.

12. The precision equivalent aircraft landing method as recited in claim 7 wherein said step of generating vertical position information of said aircraft with respect to said landing approach path further includes the step of:

generating vertical position information of said aircraft with respect to said landing approach path using a baro-altimeter.

13. An ILS equivalent aircraft landing apparatus comprising:

a satellite-based position determining system adapted to be coupled to an aircraft, said satellite position determining system adapted to generate lateral position information of said aircraft with respect to a landing approach path;

an altimeter adapted to be coupled to said aircraft, said altimeter adapted to generate vertical position information of said aircraft with respect to said landing approach path, said altimeter adapted to provide said vertical position information without receiving second vertical position information from said position determining system; and

a graphic display for concurrently displaying a visual representation of said lateral position of said aircraft with respect to said landing approach path and said vertical position of said aircraft with respect to said landing approach path, wherein said ILS equivalent aircraft landing apparatus provides said visual representation of said lateral position of said aircraft with respect to said landing approach path and said vertical position of said aircraft with respect to said landing approach path without requiring ground-based infrastructure at or near said landing approach path.

14. The ILS equivalent aircraft landing apparatus of claim 13 wherein said satellite-based position determining system consists of the Global Positioning System.

15. The ILS equivalent aircraft landing apparatus of claim 13 wherein said satellite-based position determining system consists of the Global Orbiting Navigation System.

16. The ILS equivalent aircraft landing apparatus of claim 13 wherein said satellite-based position determining system further includes:

a signal receiver; and

a signal processor having an input coupled to said signal receiver, said signal processor generating said lateral position information of said aircraft with respect to said landing approach path from signals received at said input from said signal receiver, said signal processor having an output coupled to said graphic display, said output providing said lateral position information of said aircraft with respect to said landing approach path from said signal processor to said graphic display.

17. The ILS equivalent aircraft landing apparatus of claim 13 wherein said altimeter is comprised of a baro-altimeter.