Active passive fuzing system

Claim 2

An active passive fuzing system for use in a guided missile comprising: a. means for transmitting radio frequency energy, b. first receiving circuit means including a receiving antenna that is oriented to receive signals in the direction of missile flight and second receiving circuit means including a receiving antenna oriented to receive signals in the direction opposite to the direction of missile flight for receiving and detecting said transmitted energy reflected from a target to be detected, c. comparison circuit means coupled to said first and second receiving means for comparing the magnitudes and phase of the received reflected signals and producing a detonating signal when like signals are received in each of said first and second receiving means, and d. gate circuit means coupled to said comparison circuit means and being responsive to an output signal thereof to turn off said transmitting means when a countermeasures signal overrides the reflected signals from the target and turning said transmitting means on when said countermeasures signal ceases.

Claim 3

An active passive fuzing system for use in a guided missile comprising: a. means for transmitting radio frequency energy, b. first receiving circuit means including a receiving antenna that is oriented to receive signals in the direction of missile flight and second receiving circuit means including a receiving antenna oriented to receive signals in the direction opposite to the direction of missile flight for receiving and detecting said transmitted energy reflected from a target to be detected, c. comparison circuit means coupled to said first and second receiving means for comparing the magnitudes and phase of the received signals and producing a detonatiNg signal when like signals are received in each of said first and second receiving means, d. automatic gain control circuit means having an input coupled to the output of the first receiving circuit means and having a first output coupled as an input to said first receiving circuit means and a second output coupled as an input to the second receiving circuit means for reducing the gains of both receiving circuits proportionately to an increase in the level of the received signals, and e. gate circuit means coupled to said comparison circuit means and being responsive to an output signal thereof to turn off said transmitting means when a countermeasure signal overrides the reflected signal from the target and for turning said transmitting on when said countermeasures signal ceases.

Claim 4

An active passive fuzing system for use in a guided missile comprising: a. means for transmitting radio frequency energy, b. first receiving circuit means including a receiving antenna that is oriented to receive signals in the direction of missile flight and second receiving circuit means including a receiving antenna oriented to receive signals in the direction opposite to the direction of missile flight for receiving and detecting said transmitted energy reflected from a target to be detected, c. comparison circuit means coupled to said first and second receiving means for comparing the magnitudes and phase of the received signals and producing a detonatiNg signal when like signals are received in each of said first and second receiving means, d. automatic gain control circuit means having an input coupled to the output of the first receiving circuit means and having a first output coupled as an input to said first receiving circuit means and a second output coupled as an input to the second receiving circuit means for reducing the gains of both receiving circuits proportionately to an increase in the level of the received signals, and e. gate circuit means coupled to said comparison circuit means and being responsive to an output signal thereof to turn off said transmitting means when a countermeasure signal overrides the reflected signal from the target and for turning said transmitting on when said countermeasures signal ceases.

Claim 5

An active passive fuzing system for use in a guided missile comprising: a. means for transmitting radio frequency energy, b. first receiving circuit means including a receiving antenna that is oriented to receive signals in the direction of missile flight and second receiving circuit means including a receiving antenna oriented to receive signals in the direction opposite to the direction of missile flight for receiving and detecting said transmitted energy reflected from a target to be detected, c. comparison circuit means coupled to said first and second receiving means for comparing the magnitude and phase of the received reflected signals and producing a detonating signal when like signals are received in each of said first and second receiving means, and d. means coupled to said comparison circuit means and to said transmitting means for turning off said transmitting means when signals of dissimilar predetermined amplitudes persist for a predetermined time.

Claim 6

An active passive fuzing system for use in a guided missile comprising: a. means for transmitting radio frequency energy, b. first receiving circuit means including a receiving antenna that is oriented to receive signals in the direction of missile flight and second receiving circuit means including a receiving antenna oriented to receive signals in the direction opposite to the direction of missile flight for receiving and detecting said transmitted energy reflected from a target to be detected, c. comparison circuit means coupled to said first and second receiving means for comparing the magnitude and phase of the received reflected signals and producing a detonating signal when like signals are received in each of said first and second receiving means, and d. means coupled to said comparison circuit means and to said transmitting means for turning off said transmitting means when signals of dissimilar predetermined amplitudes persist for a predetermined time.

Claim 7

An active passive fuzing system for use in a guided missile comprising: a. means for transmitting radio frequency energy, b. first receiving circuit means including a receiving antenna that is oriented to receive signals in the direction of missile flight and second receiving circuit means including a receiving antenna oriented to receive signals in the direction opposite to the direction of missile flight for receiving and detecting said transmitted energy reflected from a target to be detected, c. comparison circuit means coupled to said first and second receiving means for comparing the magnitude and phase of the received reflected signals and producing a detonating signal when like signals are received in each of said first and second receiving means, and d. means coupled to said comparison circuit means and to said transmitting means for turning off said transmitting means in the presence of countermeasures signals.

Claim 8

An active passive fuzing system for use in a guided missile comprising: a. means for transmitting radio frequency energy, b. first receiving circuit means including a receiving antenna that is oriented to receive signals in the direction of missile flight and second receiving circuit means including a receiving antenna oriented to receive signals in the direction opposite to the direction of missile flight for receiving and detecting said transmitted energy reflected from a target to be detected, c. comparison circuit means coupled to said first and second receiving means for comparing the magnitude and phase of the received reflected signals and producing a detonating signal when like signals are received in each of said first and second receiving means, and d. means coupled to said comparison circuit means and to said transmitting means for turning off said transmitting means in the presence of countermeasures signals.