Device for the detection of radar transponder signals and secondary radar comprising such a device

Abstract

Abstract 1. Electronic device for the detection of response signals transmitted by radar transponders, these response signals comprising a plurality of code pulses framed by two framing pulses (F1 and F2 ) the relative time shift (Tp ) of which is fixed, comprising : - a delay circuit (12) the delay duration of which is substantially equal to Tp , this delay circuit comprising a plurality of cells (12a to 12n) provided with taps ; - two transition detectors permitting to detect the position of the framing pulse edges, first (13) and second (14) detectors connected to the input and to the output of the delay circuit, respectively ; - two coincidence detectors : a first detector (15) connected to the outputs of the transition detectors responsive to the leading edges of the framing pulses, a second detector (16) connected to the outputs of the coincidence detectors responsive to the trailing edges of the framing pulses ; - two storing circuits (17 and 18) for temporarily storing the code pulse values, these storing circuits comprising common input signal connected to the taps of the cells of the delay circuit, control inputs respectively connected to the outputs of the two coincidence detectors and parallel outputs, characterized in that it comprises in addition : - a digital comparator (20) connected between the outputs of the two storing circuits (17, 18), this digital comparator comprising an output (Z) supplying an electric signal when the contents of these storing circuits have identical values.

Inventors

• 👤 Jean-Pierre Madec
• 👤 Gérard Gaultier
• 👤 Claude Devolder

Bibliographic Details