Angle measurement method for bistatic MIMO radar

Abstract

The invention belongs to the technical field of radar angle measurement, discloses an angle measurement method for a bistatic MIMO radar, and mainly solves problems that a conventional single-pulse bistatic MIMO radar are not high in estimation precision of DOD and DOA and is complex in calculation complexity. The scheme of the invention is that the method comprises the steps: enabling a transmitting antenna array element to transmit an orthogonal waveform, wherein the orthogonal waveform is reflected by a target and returns to a receiving antenna array element, and an echo signal is obtained;carrying out the beam scanning peak searching after the matched filtering and MTD filtering of the echo signal, so the DOA and DOD estimation is a two-dimensional searching process; taking a transmitter and a receiver as focuses, and building a series of distance and contour line equation sets, wherein the contour line equations provide the one-to-one corresponding relations between DOA and DOD,and the DOA and DOD estimation can be reduced to one-dimensional searching from the two-dimensional searching, thereby reducing the calculation burden and improving the estimation precision. Accordingto the invention, the additional information of distance and contour lines is added, and the DOA and DOD estimation performance is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of radar angle measurement, and in particular relates to an angle measurement method of a bistatic MIMO radar. Background technique [0002] In order to determine the spatial position of the target, in most cases, the radar must not only measure the distance of the target, but also determine the direction of the target, that is, measure the angular coordinates of the target, including the azimuth and elevation angle of the target. [0003] Although monostatic radar with integrated transceiver is technically easy to implement and has high work efficiency, due to institutional reasons, it faces four threats: electronic interference, ultra-low altitude penetration, stealth weapons, and anti-radiation missiles. In contrast, bistatic radar systems have stronger survivability and higher detection capabilities. [0004] Bistatic radar uses two bases that are quite far apart (the baseline distance is comparable to ...

AI Technical Summary

Problems solved by technology

Although traditional subspace algorithms such as MUSIC and ESPRIT algorithms can be applied to the angle estimation of bistatic MIMO radars, they have the problem of low estimation accuracy under low signal-to-noise ratios, and the ESPRIT algorithm uses the characteristics of rotation invariant factors, so it is only applicable to equidistant line array

The traditional method of performing a two-dimensional search on the accumulated receiver matched filter output signal to determine the DOD and DOA by finding the peak has the problems of large calculation and low positioning accuracy, which seriously limits its application in actual radar systems

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