Abstract: An active radar target includes several receive antennas and several transmit antennas that are arrangeable into pairs of antennas. Each pair includes a transmit and a receive antenna. At least one antenna in a pair is at a different height relative to at least one other antenna in a different pair of antennas.

Abstract: An active radar target comprising a plurality of receive antennas and a plurality of transmit antennas arrangeable into pairs of antennas with at least one antenna in a pair being at a different height to at least one antenna in a different pair of antennas.

Abstract: An active radar target comprising: a receive antenna for receiving a radar signal, an amplifier for amplifying the signal, and a transmit antenna for retransmitting the amplified signal, characterised in that the active radar target further includes a memory for storing an identity code or means for receiving an identity code, a modulator for receiving the identity code and modulating the radar signal with at least the identity code prior to retransmission of the amplified signal, and wherein the modulator is a single sideband modulator.

Abstract: An apparatus for measuring the relative direction of an incoming radio signal, the apparatus comprising at least first and second antennas, and comparison means for comparing the incoming radio signal as received at the first antenna with the incoming radio signal as received at the second antenna, and from the result of the comparison transmitting a measurement of the relative direction.

Abstract: A proximity fuze for use in a tube launched projectile carrying a payload, comprising an oscillator for generating a radio frequency signal which has a varying frequency, a single antenna for transmitting the radio frequency signal and for receiving an echo of the radio frequency signal, a first signal processor for generating a range signal corresponding to the time delay between the transmission of the radio frequency signal and the receipt of the echo signal, second signal processor for comparing the range signal with a reference signal and depending on the result of the comparison generating an activation signal for activating the payload, wherein a directional coupler is used for coupling the radio frequency signal from the oscillator to the antenna and to the signal processor and for coupling the echo signal from the antenna to the signal processor, and wherein the second signal processor comprises a threshold detector, a peak detector and a comparator, the threshold detector being for allowing the comp

Abstract: A proximity fuze for use in a tube launched projectile carrying a payload, comprising an oscillator for generating a radio frequency signal which has a varying frequency, a single antenna for transmitting the radio frequency signal and for receiving an echo of the radio frequency signal, a first signal processor for generating a range signal corresponding to the time delay between the transmission of the radio frequency signal and the receipt of the echo signal, second signal processor for comparing the range signal with a reference signal and depending on the result of the comparison generating an activation signal for activating the payload, wherein a directional coupler is used for coupling the radio frequency signal from the oscillator to the antenna and to the signal processor and for coupling the echo signal from the antenna to the signal processor, and wherein the second signal processor comprises a threshold detector, a peak detector and a comparator, the threshold detector being for allowing the comp