| 摘要 |
1499312 Immunizing against jamming BOLKOW GmbH 31 March 1964 [9 April 1963] 13247/64 Heading H4L In a system for the transmission of signals (such as A, Fig. 2) in which the received signals cannot be affected by third party interference, the signal A is fed to a converter 2 where it is divided into a number of sub-ranges #K and a pulse of constant amplitude and duration is produced wherever the signal crosses a range line g, this pulse being positive for a rising signal and negative for a falling signal. The output of converter 2 is shown at B, Fig. 2, the individual pulses coalescing to form a pulse of longer duration when the signal A rises or falls at its maximum rate. The signal B is separated (16, 17) into its positive and negative portions which are supplied to respective channels I, II. The signal in channel II is reversed in polarity (4), and both signals C, D are then supplied via respective modulators 3, 5 to a transmitter 6. The signal radiated by aerial 14 is received by an aerial 15 of a receiver 7 and is conveyed to a filter (not shown) which separates the impulses C and D and passes them to demodulators 8, 9 in channel I 1 , II 2 to become signal C 1 and D 1 respectively. The signal C, is supplied directly to an integrator 11 whereas signal D 1 previously has its polarity reversed in a reversing amplifier 10 where it becomes a negative signal E. The integrator 11 produces an output signal F from the sum of the signals C, and E. Thus any jamming action will be cancelled out in the integrator due to the reversing amplifier 10. |
