Device for the detection of the signals of transponders interrog

Details Device for the detection of the signals of transponders interrog Device for the detection of the signals of transponders interrog

1990-10-23

1991-11-05

Barron, Jr., Gilberto

Communications: directive radio wave systems and devices (e.g.,

Air traffic control

Secondary surveilance radar

342 37, G01S 1378, G01S 1344

Patent

active

050633864

ABSTRACT:
The device improves the decoding of the replies in S mode deformed by multiple-path phenomena or by imbrication with replies in standard A or C mode. To do this, the device carries out the following in the reception video signal Log .SIGMA. of the secondary radar: determines a pulse level reference value of the data block of the reply by a study of the histogram of the presumed pulse levels of data and compares the level of the reception signal Log .SIGMA. taken at the middle of each time interval that may be occupied by a data pulse with the level reference value, a data pulse being detected or not detected according to the result of the comparison. Should there be a negative result in a baud period, it may recommence similar operations on the angle measurement video signal .SIGMA./.DELTA. if the secondary radar is a monopulse radar.

REFERENCES:
patent: 4334224 (1982-06-01), Gordon
patent: 4970518 (1990-11-01), Cole, Jr.
IEE, International Conference, Radar '87, London, Oct. 19-21, 1987, pp. 237-241; A. J. McDevitt et al.: "Operation of Monopulse SSR at Difficult Sites".
Alta Frequenza, vol. 52, No. 5, 1983, pp. 350-364, Milano, IT; G. Benelli et al.: "Angle Estimation and Discrimination of Monopulse SSR Replies in the Presence of Synchronous Interference".

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