SIGNAL DECODING METHOD AND COORDINATES MEASURING DEVICE IMPLEMENTING THIS METHOD Russian patent published in 2004 - IPC

FIELD: systems for controlling flying vehicles from signal (guidance command) decoding control center. SUBSTANCE: decoding method designed for decoding signal (guidance command) using harmonic-wave frequency-shift pulsewidth modulation (PWM-FS) on board missile in optical communication lines or additional carrier-wave amplitude modulation (PWM-FS-AM) in analog radio links includes signal filtration at operating frequency and separation of constant component; in the process limiting threshold is set for filtered-off harmonic signal below amplitude of this signal but above maximal noise amplitude, signal is compared with limiting threshold, harmonic signal whose amplitude exceeds limiting threshold is converted into square pulses of length (τ_p) equal to where U_pt- is limiting threshold voltage; U_s is harmonic signal amplitude compared with limiting threshold; T is signal repetition period. Device implementing this method has receiver 1, AGC amplifier 2, two identical channels each incorporating two selective filters 3 and low-pass filter 8, two comparators 4, two transistor switches 6, inverter 5, adder 7, and reference voltage source . EFFECT: enhanced noise immunity and coordinate measurement accuracy, twice as low effect of sine-wave signal amplitude instability. 2 cl, 3 dwg