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On-Line Prediction of Loss of Control Using Wavelets

Award Information

National Aeronautics and Space Administration
Award ID:
Program Year/Program:
2001 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Systems Technology Inc.
13766 Hawthorne Blvd. Hawthorne, CA 90250-
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2001
Title: On-Line Prediction of Loss of Control Using Wavelets
Agency: NASA
Contract: N/A
Award Amount: $0.00


Loss of control in aircraft can result from changes in the controlled element, the control system, the environment, or adverse pilot-vehicle interaction. Each of these paths can be characterized by a loss of phase margin. It is not possible to predict or compensate for all possible sources of additional phase lag in the design process, and so there is a need for on-line health monitoring of the flight control system. The challenge then is to detect the erosion of phase margin in a timely manner and either warn the pilot or automatically take corrective action. In the Phase I effort we intend to use an innovative Time Varying Transfer Function technique to track the phase margin of a time-varying system. These special transfer functions are based on Wavelet Transforms. In contrast to windowed Fourier transforms, these transforms have the ability to analyze a signal at multiple scales, thus allowing for quick response to high frequency changes in the system, without sacrificing low frequency resolution. In Phase I we will develop the methodology and an associated on-line health monitoring toolbox to implement our approach. Example scenarios and available flight test data will be used to demonstrate feasibility.

Principal Investigator:

Vineet 1. Ph.D.
Staff Engineer, Research

Business Contact:

Thomas Myers
Vice President
Small Business Information at Submission:

Systems Technology, Inc.
13766 S. Hawthorne Blvd. Hawthorne, CA 90250

Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No