Automatic reprogramming means for countermeasures system

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to FIG.
1, there is illustrated thereby a block diagram of a countermeasures system incorporating the several features of the present invention.
The transmit and receive antennas, receiver 1, transmitter 2, range program matrix 3, angle matrix 4, clocks 5 and 6, and repeater 10 are conventional countermeasures system components.
Countermeasures systems of course include other components not shown in FIG.
1.
These have been omitted from the present description since they are not germane to the invention.
Range change circuit 8 together with receiver lock on command signals from receiver 1 provide automatic false target range changes in accordance with one feature of the invention.
Likewise, enable-disable circuits 11 and angle change circuit 9 provide automatic false range target inclusion and exclusion and automatic false target angle changes, respectively.
The present invention comprehends three means for automatically changing the countermeasures system false target position program.
These include (a) changing the information which is used to produce the range positions of the false targets; (b) disabling some range positions and enabling others; and (c) changing the information which is used to produce the angular positions of the false targets.
All combinations of these means are also within the scope of the invention.
The schematic diagram of FIG.
2 illustrates switching circuits that will accomplish (a).
Matrix 3 stores a particular false target range program.
In a conventional countermeasures system input counts such as digital counts 13 through 17 are delivered to the matrix inputs.
They are delivered directly (as to input 1) and inverted (as through amplifier 18) to input 2.
The range information in these digital counts is derived from oscillator clock 5 which is locked in phase with the PRF from the threat radar.
Range program matrix 3 decodes the digital counts and generates pulses positioned in time (range) with respect to the received pulse