Abstract: This invention relates to a data coder, code searching mechanism, data deer, and range computer for a missile wherein the missile receiver is able to discriminate between the real signals and jamming signals. The system provides discrimination in aircraft receiver systems for the return synchronization signal. This is accomplished by utilizing a random code generator wherein the command data signals modulate the code train which in turn modulates the RF carrier. The missile contains a second code generator with a code searching mechanism which synchonizes the second code generator with the first generator. The comparison of the second code generator signal with the received signal produces the command signal as an output.

Abstract: This invention relates to an aircraft missile communication system comprig means to generate a digital sequence corresponding to command signals, means in the aircraft to mix the digital command sequence with the code sequence and transmit the combination to an object; means to compare the received code sequence with the second digital code sequence and means in said object depended upon the comparing means to express said digital command sequence.

Abstract: A command data link between an aircraft and a missile having a high invulability to jamming by providing a communications system in which the missile receiver is normally off and is gated on only during a short time during which a signal is supposed to appear, as determined by the missile synchronizer. Coded information is transmitted to the missile by the absence of pulses in a pulse train so that spurious pulses received by the missile cannot result in undesirable missile commands.