Abstract: Radar apparatus used for point-source location, where an adaptive feed forward artificial neural network is used to calculate a position vector from image information provided by radar receiving element outputs. Where an object is sensed within a field of view of a multiple output radar, then the radar receiving sensor element outputs are processed inputs as image vectors for use in input nodes of an input node layer of the artificial neural network. Typically the neural network has the same number of input nodes as the number of sensor element outputs an array within the radar receiver. Increased accuracy of point-source location can be achieved by increasing the number of hidden layers used, and/or increasing the number of nodes within each hidden layer. Training of the artificial neural network is described for (5.times.1), (1.times.5) and (4.times.4) radar receiving arrays, and also for idealised and noisy data.