Partial intercept LPI (low probability of intercept) reconnaissance system

Disclosed is an apparatus and method for separately tracking, identifying and providing DF on LPI RF transmitters. Intercepter circuitry which includes an antenna and a single channel receiver is utilized to receive and down convert LPI RF signals to LPI IF signals. Digitizer circuitry is utilized for down converting the LPI IF signals to LPI baseband signals as well as utilized for converting the LPI baseband signals to digital data. A spectrum analyzer generates power spectrums utilizing the digital data and passes the power spectrums to a signal detector. The signal detector detects signal clusters in the power spectrums and associates the signal clusters from the same LPI RF signals to create pulse descriptor words for the LPI RF signals. Tracker/database circuitry tracks and identifies the LPI RF transmitters by utilizing the pulse duration, pulse frequency and pulse phase of the pulse descriptor words and a DF system provides DF information on the LPI RF transmitters by performing multiple frequency AOA calculations.