Abstract: Some embodiments are directed to a radar imaging system that includes a radar transmitter configured to transmit radar at a target; an aperture including an array of physically independent airborne carriers, each of the carriers configured to receive radar echoes from the target; and a base station, which may be located at ground level, in communication with each of the airborne carriers to receive the radar echoes and determine an image of the target from the received radar echoes.

Abstract: Some embodiments are directed to a radar imaging system that includes a radar transmitter configured to transmit radar at a target; an aperture including an array of physically independent airborne carriers, each of the carriers configured to receive radar echoes from the target; and a base station, which may be located at ground level, in communication with each of the airborne carriers to receive the radar echoes and determine an image of the target from the received radar echoes.

Abstract: Some embodiments are directed to techniques that mitigate the problems of range walk where fast moving objects are detected using pulsed target detection systems having relatively long dwell times. A pulse generator for a pulsed target detection system controls generation of a series of pulses to be transmitted by the target detection system. The time between pulses and pulse characteristics are controlled such that any range migration due to target movement in the time between pulses of said series is substantially equal and opposite to any variation in range-Doppler coupling between the pulses due to said target movement. By controlling the transmitted pulses in this way, any potential variation in range cell due to target motion is offset by an equal and opposite variation in range-Doppler coupling, whatever the target radial velocity. The techniques are particularly applicable to radar systems.