Pulse or digital communications – Transceivers – Modems
Reexamination Certificate
1998-03-12
2001-02-06
Pham, Chi H. (Department: 2631)
Pulse or digital communications
Transceivers
Modems
C375S271000, C329S322000
Reexamination Certificate
active
06185248
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is directed to a receiver, specifically a digital microwave receiver (DMR) with improved spectral dynamic range and reception instantaneous bandwidth.
2. Description of Related Art
Most tracking radar systems not intended for space applications operate in the range of 2 GHz to 20 GHz, although search radars often operate in lower bands, and have an instantaneous bandwidth (IBW) on the order of 1 to 10 MHz. Electronic Warfare (EW) receivers need to rapidly acquire such radar signals, so a narrow band IBW tuneable superheterodyne detector is not appropriate by itself.
EW receivers with wide IBW's have been employed, such as crystal video receivers and digital instantaneous frequency measurement (IFM) receivers. However, the signal environment is quite complex, especially if viewed over a wide band, and includes low, medium and high duty cycle signals. The present wide band EW receivers cannot accurately provide information when pulse signals are simultaneously present, especially for the weaker of the simultaneous signals. Simultaneous signals cause the sensor to be blinded or generate false data.
To achieve the requirement for both fine selectivity and wide reception, the use of many channels, each with a high sensitivity detector, is advocated. But, even if a large number of channels is proven practical, the subsequent processing of the received signals will be overwhelmed with data.
The economic impact of having many channels is presently minimized by employing parallel receiver hardware, employing a variety of receiver types and multiplexing receivers across the band.
SUMMARY OF THE PRESENT INVENTION
Therefore, it is an object of the present invention to provide an economical solution to the many channel problem. It is further an object to provide a receiver which can capture all signals in very wide instantaneous bandwidth, can handle simultaneous signals and has good sensitivity.
It is further an object to provide a receiver having a narrow selectivity IBW, a very wide reception IBW and a compatible data interface with the digital signal processor (DSP).
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the specific examples in the detailed description, indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those of skill in the art from this detailed description.
REFERENCES:
patent: 5197085 (1993-03-01), Luff
patent: 5454007 (1995-09-01), Dutta
patent: 5770977 (1998-06-01), Uurtamo
patent: 5960045 (1999-09-01), DuPonteil et al.
patent: 6005506 (1999-12-01), Bazarjani et al.
Northrop Grumman Corporation
Pham Chi H.
Tran Khai
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