Boots – shoes – and leggings
Patent
1996-11-08
1999-06-08
Mai, Tan V.
Boots, shoes, and leggings
36472416, G06F 1710
Patent
active
059109050
ABSTRACT:
A system and method for detecting the presence of dispersed broadband signals in real time. The present invention utilizes a bank of matched filters for detecting the received dispersed broadband signals. Each matched filter uses a respective robust time template that has been designed to approximate the dispersed broadband signals of interest, and each time template varies across a spectrum of possible dispersed broadband signal time templates. The received dispersed broadband signal x(t) is received by each of the matched filters, and if one or more matches occurs, then the received data is determined to have signal data of interest. This signal data can then be analyzed and/or transmitted to Earth for analysis, as desired. The system and method of the present invention will prove extremely useful in many fields, including satellite communications, plasma physics, and interstellar research. The varying time templates used in the bank of matched filters are determined as follows. The robust time domain template is assumed to take the form w(t)=A(t)cos{2.phi.(t)}. Since the instantaneous frequency f(t) is known to be equal to the derivative of the phase .phi.(t), the trajectory of a joint time-frequency representation of x(t) is used as an approximation of .phi.'(t).
REFERENCES:
patent: 5272724 (1993-12-01), Solomon et al.
Dunham Mark E.
Qian Shie
Hood Jeffrey C.
Mai Tan V.
National Instruments Corporation
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