Doppler distance measuring system

Claim 3

The system of claim 1 including biasing means for controlling the voltage level at which said second voltage timing function is initiated.

Claim 4

The system of claim 2 wherein said biasing means is variable and means responsive to the frequency of said doppler signal for controlling the bias provided by said biasing means.

Claim 5

A missile fuzing system adapter to detonate a missile at a predetermined altitude, said fuzing system comprising in combination: means for transmitting radiofrequency energy towards the earth, receiving reflected energy therefrom, and mixing the transmitted and received energy to produce a doppler signal representative of the relative velocity between the missile and the earth, generating means for producing a voltage at its output which rises positively at a known rate, means for initiating said generating means when the doppler signal reaches a first amplitude, a phantastron circuit, means for triggering said phantastron circuit when the doppler signal reaches a second amplitude which is substantially twice the amplitude of said first amplitude, the triggering of said phantastron circuit causing its screen voltage to immediately rise to a higher value and its plate voltage to fall linearly until "bottoming" occurs whereupon the screen grid voltage immediately falls to its initial value, an adjustable d-c voltage source, means for connecting said phantastron circuit to said generating means and said source so that when said phantastron is triggered the plate voltage of said phantastron circuit has a value determined by the voltage to which the output voltage of said generating means has risen in series with an opposing d-c voltage provided by said source, said opposing d-c voltage being chosen in accordance with the inverse relationship between the altitude and the amplitude of the doppler signal so that when "bottoming" occurs the missile is at a predetermined altitude, and means connected to said phantastron circuit for producing a pulse to initiate detonation of the missile in response to the immediate fall of said screen voltage of its initial value at "bottoming."

Claim 6

A missile fuzing system adapter to detonate a missile at a predetermined altitude, said fuzing system comprising in combination: means for transmitting radiofrequency energy towards the earth, receiving reflected energy therefrom, and mixing the transmitted and received energy to produce a doppler signal representative of the relative velocity between the missile and the earth, generating means for producing a voltage at its output which rises positively at a known rate, means for initiating said generating means when the doppler signal reaches a first amplitude, a phantastron circuit, means for triggering said phantastron circuit when the doppler signal reaches a second amplitude which is substantially twice the amplitude of said first amplitude, the triggering of said phantastron circuit causing its screen voltage to immediately rise to a higher value and its plate voltage to fall linearly until "bottoming" occurs whereupon the screen grid voltage immediately falls to its initial value, an adjustable d-c voltage source, means for connecting said phantastron circuit to said generating means and said source so that when said phantastron is triggered the plate voltage of said phantastron circuit has a value determined by the voltage to which the output voltage of said generating means has risen in series with an opposing d-c voltage provided by said source, said opposing d-c voltage being chosen in accordance with the inverse relationship between the altitude and the amplitude of the doppler signal so that when "bottoming" occurs the missile is at a predetermined altitude, and means connected to said phantastron circuit for producing a pulse to initiate detonation of the missile in response to the immediate fall of said screen voltage of its initial value at "bottoming."

Claim 7

The invention in accordance with calim 4, there being additionally provided: means responsive to the frequency of said doppler signal for adjusting the opposing d-c voltage provided by said source to a value which will compensate for different relative velocities between the missile and the earth.

Claim 8

The invention in accordance with calim 4, there being additionally provided: means responsive to the frequency of said doppler signal for adjusting the opposing d-c voltage provided by said source to a value which will compensate for different relative velocities between the missile and the earth.