초록 ▼

An algorithm for emitter identification of a transmitting platform using microphone keyclick analysis, and a system utilizing said algorithm, wherein said algorithm processes audio signals to detect transmission activity on a radio channel in the audio frequency range, detects the boundaries of tran

An algorithm for emitter identification of a transmitting platform using microphone keyclick analysis, and a system utilizing said algorithm, wherein said algorithm processes audio signals to detect transmission activity on a radio channel in the audio frequency range, detects the boundaries of transmitter keyclicks at the beginning and end of said transmission; extracts keying envelopes from said detected keyclick boundaries; and analyzes said keying envelopes to extract features characteristic of said keyclicks. The algorithm and system then proceed to execute a decision function based on said extracted characteristic features to identify the platform of said transmitter based on the features of said keyclick. A second algorithm, which may be executed in parallel with the first by said system, processes said transmission data using a fast fourier transform, detecting gaps in said processed transmission data. It then extracts spectral features consisting of normalized energy per unit frequency from said gaps; and correlates identification of said emitter platforms based on said extracted spectral features with identification of said emitter platforms based on said extracted keyclick features.

대표청구항 ▼

[ We claim:] [1.]1. A system for emitter identification of a transmitting platform using microphone keyclick analysis, comprising:means to detect transmission activity on a radio channel in the audio frequency range;means to detect the boundaries of transmitter keyclicks at the beginning and end of

[ We claim:] [1.]1. A system for emitter identification of a transmitting platform using microphone keyclick analysis, comprising:means to detect transmission activity on a radio channel in the audio frequency range;means to detect the boundaries of transmitter keyclicks at the beginning and end of said transmission;means to extract keying envelopes from said detected keyclick boundaries;means to analyze said keying envelopes to extract features characteristic of said keyclicks;means to execute a decision function based on said extracted characteristic features to identify the platform of said transmitter based on the features of said keyclick.