Estimation method for bistatic MIMO (multiple input multiple output) radar angle

An angle and radar system technology, which is applied in the field of angle estimation of bistatic MIMO radar, and can solve problems such as the inability to effectively suppress related noise.

Active Publication Date: 2014-12-17
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

This is mainly because the ESPRIT algorithm needs to solve a rotation invariant equation, but the noise on both sides of this equation is correlated, and the traditional LS method cannot effectively suppress the correlated noise

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  • Estimation method for bistatic MIMO (multiple input multiple output) radar angle
  • Estimation method for bistatic MIMO (multiple input multiple output) radar angle

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] attached figure 1 It is an algorithm flow chart of the method provided by the invention. Consider a bistatic MIMO radar system with M transmit antennas and N receive antennas. The transmit and receive antennas are uniform linear arrays (ULA) spaced at half wavelength intervals. Assuming that there are P uncorrelated signals, after matched filtering, the received signal can be expressed as:

[0031] x(t)=As(t)+n(t),t=1,L,L (1)

[0032] Among them, A=[a 1 ,L,a P ] is the array pop, middle is the Doppler frequency, is the reflection coefficient. Noise n(t) has mean zero and variance σ 2 I MN The white Gaussian process of , L is the number of snapshots. The steering vector corresponding to the i-th target can be expressed as in

[0033] a ( φ i ...

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Abstract

The invention discloses a method, namely an SLS-ESPRIT (structure least square-estimating signal parameters via rotational invariance techniques) algorithm, for joint estimating angle of departure (DOD) to angle of arrival (DOA) of a target in a MIMO (multiple input multiple output) radar system on the basis of an SLS method. Estimation accuracy of signal subspace is improved by solving rotational invariance equation by the aid of the SLS and iterating estimation error of minimized signal subspace, and angle estimation performance is enhanced. In addition, effectiveness of the estimation method is testified through simulation results.

Description

technical field [0001] The invention relates to the technical field of array signal processing, in particular to a method for estimating the angle of a bistatic MIMO radar. Background technique [0002] MIMO radar is a new type of radar developed on the basis of traditional phased array radar by applying multiple input multiple output technology to radar system. In the MIMO radar system, the improvement of performance is mainly due to its unique orthogonal waveform matching technology and the resulting more flexible signal processing method. Estimating the DOD and DOA of a target is one of the main problems faced by bistatic radars. At present, many techniques for jointly estimating DOD and DOA have been proposed, such as ESPRIT (Estimating Signal Parameters via Rotational Invariance Techniques) algorithm, unitary ESPRIT algorithm and ESPRIT-MUSIC algorithm. However, such algorithms are all based on least squares. When two subarrays have overlapping elements, the performa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/021G01S7/023G01S13/003
Inventor 钱诚黄磊蒋双杨云川
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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