1. A hyperspectral imaging system, comprising: a focal plane array; a grating-free spectrometer, having one or both of a lenslet array and an aperture array, for first dividing a field of view into multiple channels and for then reimaging each of the multiple channels as a spectral signature onto the focal plane array; first optics, to collimate electromagnetic energy of the multiple channels; a prism, to disperse the electromagnetic energy of the multiple channels into the spectral signatures; second optics to image the spectral signatures onto the focal plane array; and a processor connected with the focal plane array for forming a hyperspectral data cube from the spectral signatures, wherein objects may be identified from the hyperspectral data cube.