1. A method for generating an image matrix, comprising: accessing a round-trip time matrix for a space comprising a plurality of points, the round-trip time matrix describing an estimated round-trip time for a signal of a plurality of signals to travel from a transmit antenna of one or more transmit antennas, to a point of the plurality of points, and to a receive antenna of one or more receive antennas; receiving the plurality of signals reflected from an object of the space, each signal received at a corresponding receive antenna of the one or more receive antennas; repeating for at least a subset of the plurality of points to generate an image matrix comprising an image value for each point of the subset of points: selecting a point of the subset of points; repeating for each receive antenna of the one or more receive antennas: establishing a waveform of a signal received by a receive antenna of the one or more receive antennas; and identifying a waveform value of the established waveform that corresponds to the selected point according to the round-trip time matrix; and combining the waveform values for the selected point to yield an image value for the selected point; and generating the image matrix from the image values.