초록 ▼

The present invention documents a digital channelized receiver for signal intercept applications. A hardware efficient implementation of a uniform filter bank in which the number of filters, K, is greater than the decimation factor, M, is provided. By optimizing the filter bank frequency response, i

The present invention documents a digital channelized receiver for signal intercept applications. A hardware efficient implementation of a uniform filter bank in which the number of filters, K, is greater than the decimation factor, M, is provided. By optimizing the filter bank frequency response, in conjunction with K and M, the proposed invention allows a simple channel arbitration logic to be implemented. In addition, the present invention provides reliable instantaneous frequency measurements and parameter estimates across the desired frequency range while reducing the data processing speed requirements by a factor of M.

대표청구항 ▼

[ I claim:] [1.] A hardware efficient digital channelized receiver comprising:frequency converter means connected to a radio frequency input signal source for converting said input signals to signals of a lower intermediate frequency;analog-to-digital converter means coupled to said frequency conver

[ I claim:] [1.] A hardware efficient digital channelized receiver comprising:frequency converter means connected to a radio frequency input signal source for converting said input signals to signals of a lower intermediate frequency;analog-to-digital converter means coupled to said frequency converter means for converting said lower intermediate frequency signals into digital signals;decimating means coupled to said analog-to-digital converter means for reducing the processing speed requirements of each said digital signal by a factor M;digital filter bank means for performing an inverse discrete Fourier transform containing K number of polyphase bandpass filters coupled to said decimating means for generating a plurality of polyphased digital channel signals from said digital signals;means, including a plurality of exponential operator-inclusive modulators coupled to individual channel outputs of said K number of polyphase bandpass filters for translating said channelized digital signals from bandpass frequencies to baseband frequencies of selected limited frequency spectrum;converter means coupled to said digital filter bank means for converting said plurality of polyphased digital channel signals into phase component signals and magnitude component signals;signal detection logic means having inputs coupled to said converter means magnitude component signals for sampling signal amplitude;digital instantaneous frequency measurement means coupled to said signal detection logic means for processing said converter means phase component signals to instantaneous frequency signals; andarbitration means coupled to output signals of said digital instantaneous frequency measurement means for segregating valid from invalid signals therefrom, said segregation being based on location of a signal within or without of a channel.