Virtual beam steering using MIMO radar
Examples disclosed herein relate to a Multiple-Input Multiple-Output (MIMO) radar for virtual beam steering. The MIMO radar has a plurality of transmit antennas and a receive antenna array having a plurality of radiating elements. The MIMO radar also includes a digital signal processor (DSP) configured to synthesize a virtual receive array having N×M receive subarrays from the plurality of transmit antennas and the receive antenna array, where N is the number of transmit antennas and M is the number of receiving elements. Other examples disclosed herein relate to a method of virtual beam steering.
1 . A method of processing data for an antenna system, comprising:
synthesizing a virtual receive array representing a plurality of transmit antennas and a plurality of receive antenna elements of the antenna system;
determining a manifold matrix that represents the virtual receive array based on a function of a geometry of the virtual receive array, a carrier frequency, and a direction of arrival of signal data received from the plurality of transmit antennas;
generating a transformation matrix from the virtual receive array and the manifold matrix; and
determining a linear transformation matrix using an optimization criterion that is a function of the virtual receive array and the transformation matrix.
2 . The method of claim 1 , further comprising:
applying the linear transformation matrix to first transmit antennas of the plurality of transmit antennas to determine second transmit antennas positioned at an angle relative to an original position of the first transmit antennas; and
applying the linear transformation matrix to the receive antenna array to determine a second receive array at an angle relative to an original position of the first receive array,
wherein the virtual receive array is spaced from the second receive antenna array by a same distance as that between the second transmit antennas.
3 . The method of claim 1 , further comprising applying the linear transformation matrix with interpolation to the manifold matrix to generate an oriented virtual subarray within the virtual receive array.
4 . The method of claim 3 , further comprising applying interpolation to signals received by receive elements of the virtual antenna array to generate the oriented virtual subarray at a predetermined orientation angle.
5 . The method of claim 1 , further comprising generating a data set that represents beam steering properties using the determined linear transformation matrix and received signal samples.