Interrogation signal processor for air traffic control communica

Details Interrogation signal processor for air traffic control communica Interrogation signal processor for air traffic control communica

1990-02-13

1992-02-18

Sotomayor, John B.

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

Aircraft collision avoidance system

With transponder

342 46, 342 38, 342 40, 342 32, 329304, 34082558, 375 84, G01S 1376, H04L 512

Patent

active

050898221

ABSTRACT:
The present invention is directed to a Mode S uplink or interrogation signal demodulation system which can quickly recognize the Mode S signal and also filter out of noise present in the Mode S uplink or interrogation signal, thereby reducing the bit error rate. To realize this goal the present invention includes a digital differential phase-shift keyed demodulator to demodulate the differential phase-shift keyed data, thereby reducing the time needed to acquire the Mode S uplink or interrogation signal. This digital demodulator also reduces the noise present in the Mode S uplink or interrogation signal and provides an integrated system which is small in structure that can be easily implemented in an aircraft. This Mode S system also includes a preamble and sync phase reversal detection circuit to recognize if the transmitted signal is a Mode S signal. This signal also utilizes Mode A and Mode C detection devices to make the system compatible with present communication systems.

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patent: 4890110 (1989-12-01), Kuwahara
patent: 4899157 (1990-02-01), Sanford et al.
patent: 4945550 (1990-07-01), Krause et al.

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