摘要:
Aircraft decoy arrangement and method for generating a decoy signal from an aircraft having an isolated decoy. An aircraft receiver detects a threat signal from a threat source targeting the aircraft. An aircraft signal processor produces a decoy relay signal based on the threat signal, where the decoy relay signal frequency is significantly lower than the threat signal frequency and is slowly attenuated through air, the signal processor calibrating the decoy relay signal in accordance with a received test signal to compensate for inaccuracies. An aircraft transmitter transmits the decoy relay signal and an optional reference signal to the decoy, where it is received by a decoy receiver, converted back to a decoy signal by a decoy frequency converter, and transmitted by a decoy transmitter, causing the threat source to detect the decoy signal and lock onto the decoy rather than the aircraft.
摘要:
A method is provided for insuring phase-coherency of a sinusoidal signal when changes occur in the signal's frequency. The method includes generation of a phase word that is used for accessing entries in relatively small Sin(x) and Cos(x) Look-Up-Tables (LUTs), which may represent values of a sinusoidal signal. The Cos(x) LUT may be used for generating a phase-related error data that may be added to a corresponding entry of the Sin(x) LUT to derive a value that is translated by a digital-to-analog converter into a corresponding analog value of the generated sinusoidal signal. The phase word may be obtained by multiplying a time word with a frequency word. The frequency word may control the signal's frequency and the phase word may maintain phase coherency. A signal generator is also provided, which utilizes the method.
摘要:
Aircraft decoy arrangement and method for generating a decoy signal from an aircraft having an isolated decoy. An aircraft receiver detects a threat signal from a threat source targeting the aircraft. An aircraft signal processor produces a decoy relay signal based on the threat signal, where the decoy relay signal frequency is significantly lower than the threat signal frequency and is slowly attenuated through air, the signal processor calibrating the decoy relay signal in accordance with a received test signal to compensate for inaccuracies. An aircraft transmitter transmits the decoy relay signal and an optional reference signal to the decoy, where it is received by a decoy receiver, converted back to a decoy signal by a decoy frequency converter, and transmitted by a decoy transmitter, causing the threat source to detect the decoy signal and lock onto the decoy rather than the aircraft.
摘要:
A system for monitoring a multiplicity of doors including at least one optical transceiver mounted on each of the multiplicity of doors and communications apparatus for communicating with each of the multiplicity of doors thereby to verify their position.