Patent ID: 6834591
Filing Date: 2004-12-28
Classification: F42C,G01S

Abstract:
A proximity fuze for use in a tube launched projectile carrying a payload, comprising:oscillator means for generating a radio frequency signal which has a varying frequency; a single antenna means for transmitting the radio frequency signal and for receiving an echo of the radio frequency signal; first signal processing means for generating a range signal corresponding to the time delay between the transmission of the radio frequency signal and the receipt of the echo signal; second signal processing means for comparing the range signal with a reference signal and depending on the result of the comparison generating an activation signal for activating the payload; wherein a directional coupling means is used for coupling the radio frequency signal from the oscillator means to the antenna means and to the signal processing means and for coupling the echo signal from the antenna means to the signal processing means; and wherein the second signal processing means comprises a threshold detector, a peak detector and a comparator, the threshold detector allowing the comparator to utilise the output from the peak detector only once the range signal has reached a predetermined magnitude.