Modulation feature measurement and statistical classification system and method
First Claim
1. A modulation feature measurement and classification system for classifying a pulsed signal, the modulation feature measurement and classification system comprising:
- a preprocessor that detects a pulse start and a pulse stop, and that measures pulse duration for the pulsed signal and that converts the pulsed signal into a plurality of digitized baseband in-phase/quadrature samples;
a phase measurement system that measures short chip counts, long chip counts, phase jump magnitudes, number of phase states, and phase modulation polynomial coefficients for a curve fit to a phase waveform for the pulsed signal; and
a modulation classifier that determines a modulation type of the pulsed signal based on the measurements of the preprocessor and the phase measurement system using both rules-based and similarity-based classification methods.
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Abstract
A modulation feature measurement and classification system for classifying a pulsed signal that includes a preprocessor, phase measurement system and modulation classifier. Preprocessor detects pulse starts and stops, measures pulse duration and converts the pulsed signal into digitized baseband in-phase/quadrature samples. Phase measurement system measures short chip counts, long chip counts, phase jump magnitudes, number of phase states, and polynomial coefficients for phase modulation of the pulsed signal. Modulation classifier determines modulation type based on the measurements using both rules-based and similarity-based classification methods.
23 Citations
20 Claims
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1. A modulation feature measurement and classification system for classifying a pulsed signal, the modulation feature measurement and classification system comprising:
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a preprocessor that detects a pulse start and a pulse stop, and that measures pulse duration for the pulsed signal and that converts the pulsed signal into a plurality of digitized baseband in-phase/quadrature samples;
a phase measurement system that measures short chip counts, long chip counts, phase jump magnitudes, number of phase states, and phase modulation polynomial coefficients for a curve fit to a phase waveform for the pulsed signal; and
a modulation classifier that determines a modulation type of the pulsed signal based on the measurements of the preprocessor and the phase measurement system using both rules-based and similarity-based classification methods. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A rule and distance based method for classifying the modulation of a pulsed signal, comprising:
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accepting measurements of pulse duration, short chip count, long chip count, phase jump magnitude, number of phase states and phase modulation polynomial coefficients for the pulsed signal;
classifying the pulsed signal as having phase-shift keyed modulation if the maximum phase jump magnitude is greater than π
/2;
if the pulsed signal is classified as having phase-shift keyed modulation, determining whether the long chip count is greater than zero;
if the pulsed signal is classified as having phase-shift keyed modulation and the long chip count is greater than zero, classifying the pulsed signal as having segmented modulation;
if the pulsed signal is classified as having phase-shift keyed modulation and the long chip count is zero, determining whether the number of phases states is greater than two;
if the pulsed signal is classified as having phase-shift keyed modulation, the long chip count is zero, and the number of phases states is not greater than two, classifying the pulsed signal as having binary phase-shift keyed modulation;
if the pulsed signal is classified as having phase-shift keyed modulation, the long chip count is zero, and the number of phases states is greater than two, classifying the pulsed signal as having multiple phase-shift keyed modulation;
if the pulsed signal is not classified as having phase-shift keyed modulation, determining whether the pulse duration is less than about 0.8 microseconds;
if the pulsed signal is not classified as having phase-shift keyed modulation and the pulse duration is less than about 0.8 microseconds, classifying the pulsed signal as having no pulse modulation; and
if the pulsed signal is not classified as having phase-shift keyed modulation and the pulse duration is not less than about 0.8 microseconds, using the number of phase states to classify the modulation of the pulsed signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification