A system 100 for stand-off screening of people 101 and/or their baggage 102, including a sensor array having an optical 103, radar 105 and acoustic 104 sensor to identify position, presence, dimensions or other properties of concealed objects. Also having a processor 109 to combine collected data and produce a risk estimate. The system may also be able to vibrate items in baggage, so a mass sensor can use the doppler effect to collect data on it. This mass sensor may be a second radar or an ultrasound sensor. The system may include an ultrasound system which may include multiple microphones. These microphones may be used by the processor to generate virtual microphones. The system may have a 3D imaging radar 110 to generate a 3D radar profile of the area. The system may have a dual polarisation radar sensor 107 to measure metallic contents. The system may use a laser to measure mass of a target. These sensors may be dispersed between two or more devices to scan a target from different perspectives. Another system may have an optical sensor and any two of; first radar, second radar, microwave and ultrasound sensors.
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