Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1991-04-18
1992-04-07
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
342377, H01Q 322
Patent
active
051032325
ABSTRACT:
An improved means of decorrelating phase quantization errors in a phased array radar antenna using digital randomization at each of the array elements to reduce peak steering erorrs and to reduce peak sidelobe levels of the antenna. A random phase adjust term is provided to each of the array's antenna elements which comprises a distributed controller (DC) co-located with a digital phase shifter. The distributed controllers are each programmed with a random phase adjust term which represents a phase shift adjustment statistically independent from element to element. The random phase adjust term is stored in a memory located in each disbtributed controller. The distributed controller drives each element's digitally controlled phase shifter in response to a beam steering command received over a serial line. The performance improvement achieved with this decorrelation method is equivalent to that obtained by using more expensive phase shifters and adding costly randomized cables in the path to each element.
REFERENCES:
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patent: 4445119 (1984-04-01), Works
patent: 4445119 (1984-04-01), Works
"Minimizing the Effects of Phase Quantization Error in an Electronically Scanned Array", C. J. Miller, Proc. of Symposium on Electronically Scanned Array Techniques and Applications, RADC-TDR-64-225, vol. 1, Jul. 1964, pp. 17-38.
"Cobra Dane Wideband Pulse Compression System", E. Filer and J. Hartt, Paper No. 61, 1976 IEEE EASCON, Washington, D.C., Sep. 1976, pp. 26-29.
"Spatial Statistics of Instrument-Limited Angular Measurement Errors in Phased Array Radars", R. H. Sahmel and Roger Manasse, IEEE Transactions on Antennas and Propagation, vol. AP-21, No. 4, Jul. 1973, pp. 524-532.
Beltran Fernando
Chang Kaichiang
Foltz Robert D.
Murdza Garret E.
Dawson Walter F.
Issing Gregory C.
Raytheon Company
Sharkansky Richard M.
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