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Flight parameter estimation using instantaneous frequency and time delay measurements from a three-element planar

¹Maritime Division, Defence Science and Technology Group, NICTA Building, 13 Garden Street, Eveleigh, New South Wales 2015, Australia.

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Summary

This summary is machine-generated.

This study enhances turbo-prop aircraft flight parameter estimation by integrating instantaneous frequency (IF) with time delay (TD) measurements. This combined approach significantly improves the accuracy of aircraft velocity and altitude calculations.

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Area of Science:

Acoustics
Aerospace Engineering
Signal Processing

Background:

Turbo-prop aircraft acoustic signals comprise narrowband tones and broadband noise.
Ground-based acoustic arrays can estimate flight parameters using time delay (TD) measurements.

Purpose of the Study:

To investigate the use of instantaneous frequency (IF) measurements to enhance flight parameter estimation accuracy.
To improve the precision of aircraft velocity and altitude estimates.

Main Methods:

Utilized a three-element planar acoustic array for signal reception.
Incorporated instantaneous frequency (IF) measurements alongside time delay (TD) measurements.
Developed and evaluated two flight parameter estimation algorithms using simulated and real data.

Main Results:

Cramer-Rao lower bound analysis indicates significant reduction in standard deviations for velocity and altitude estimates.
IF measurements, when combined with TD, substantially improve estimation precision.
Evaluated algorithms demonstrate effective performance with both simulated and real-world flight data.

Conclusions:

Integrating instantaneous frequency (IF) measurements with time delay (TD) offers a significant advancement in turbo-prop aircraft flight parameter estimation.
The proposed methods provide a more precise and reliable means of determining aircraft velocity and altitude.
This research validates the utility of IF/TD combined measurements for enhanced aerospace surveillance and monitoring.