US 11,990,049 B2
Piecewise recovery system
Kevin Prosser, Savannah, GA (US); Thomas Landers, Savannah, GA (US); Abhishek Vaidya, Savannah, GA (US); Blake Finlayson, Savannah, GA (US); and Alborz Sakhaei, Savannah, GA (US)
Assigned to GULFSTREAM AEROSPACE CORPORATION, Savannah, GA (US)
Filed by Gulfstream Aerospace Corporation, Savannah, GA (US)
Filed on Aug. 27, 2019, as Appl. No. 16/552,620.
Claims priority of provisional application 62/723,194, filed on Aug. 27, 2018.
Prior Publication US 2020/0066166 A1, Feb. 27, 2020
Int. Cl. G08G 5/00 (2006.01); B64D 45/00 (2006.01); G05D 1/00 (2006.01)
CPC G08G 5/0039 (2013.01) [B64D 45/00 (2013.01); G05D 1/0061 (2013.01); G08G 5/0056 (2013.01); G08G 5/006 (2013.01); B64D 2045/0085 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of precomputing a projected recovery trajectory for an aircraft autopilot system, comprising:
providing a stored set of predefined recovery mode segments, including:
a mode 1 segment that models an aircraft coasting;
a mode 2 segment that models the aircraft executing a nose high recovery;
a mode 3 segment that models the aircraft executing a nose low recovery;
a mode 4 segment that models the aircraft executing a throttle only recovery;
a mode 5 segment that models the aircraft executing a terrain avoidance recovery;
using a processor to generate at least one projected recovery trajectory based on a current in-flight state of the aircraft and a predicted future state of the aircraft as it executes a recovery, where the processor concatenates selected ones of the predefined recovery mode segments into a sequence and uses that sequence to generate a projected trajectory, such that the progress of one recovery mode segment determines which subsequent recovery mode segment will follow, if any.