Accession Number:

ADA056516

Title:

Identification of Periodically Amplitude Modulated Targets.

Descriptive Note:

Doctoral thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s):

• Stewart,Clayton Verne

Report Date:

1978-05-01

Pagination or Media Count:

137.0

Abstract:

An algorithm that may be used for the classification of periodically amplitude modulated PAM targets is presented. The data base used to test the algorithm is derived from radar returns from vehicles moving at various velocities and aspect angles, but the techniques are applicable, as well, to other active wave devices such as sonar and laser. The received radar signal is considered to be a time series that is a function of target type, range, velocity, orientation, and noise. Classification is implemented in the frequency domain short time spectra are computed using the Fast Fourier Transform FFT. Features are extracted from the information-bearing sidebands of the resulting spectra. The radar signatures are classified using both linear discriminant and nearest neighbor classifiers, and performance is presented for two, three, five and six class cases using single and sequential looks. Probabilities of error of less than ten percent are achieved for five or fewer classes. Author

Descriptors:

• *SIGNAL PROCESSING
• *RADAR SIGNALS
• *TARGET CLASSIFICATION
• VELOCITY
• ALGORITHMS
• THESES
• PHASE STUDIES
• PATTERN RECOGNITION
• FAST FOURIER TRANSFORMS
• SPECTRUM ANALYZERS
• ASPECT ANGLE
• AMPLITUDE MODULATION
• PERIODIC VARIATIONS
• MOVING TARGET INDICATORS

Subject Categories:

• Active and Passive Radar Detection and Equipment
• Human Factors Engineering and Man Machine Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE