Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1995-05-03
1997-06-17
Pham, Chi H.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
455143, 4551901, 455266, 342 57, H04B 116
Patent
active
056406940
ABSTRACT:
An integrated RF avionics system having a common IF interface for diverse functions, such as radar, electronic waveform(EW) and communications
avigation/identification(CNI). The interface uses a segmented band of IF frequencies which are subdivided into two or more individual band segments separated by a guard band segment. The lower frequency band segment comprises a narrow band segment which is assigned to radar functions while the other or upper band segment comprises a wideband segment assigned to other functions such as EW and CNI functions. The guard band is not used for signal transmission, but is left unused to permit bandpass filters to reject signals in the adjacent unwanted segment, thus achieving frequency separation across the IF band while allowing the use of common hardware. The total IF range is sufficiently wide that radar, EW and CNI signals can be separated from each other with practical filters while being routed through a common IF switch network. Signals from various types of antennas are routed through an RF switch network to a bank of frequency converters for converting the RF signals to an IF frequency within the IF band.
REFERENCES:
patent: 5010400 (1991-04-01), Oto
patent: 5068918 (1991-11-01), Verheijen et al.
patent: 5280636 (1994-01-01), Kelley et al.
Northrop Grumman Corporation
Pham Chi H.
Sutcliff Walter G.
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