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Doppler channel correlation two-stage dimension reduction method for onboard multiple input multiple output (MIMO) radar

A Doppler channel and dimensionality reduction technology, applied in the field of radar signal processing, can solve the problems of large amount of computation, low computational complexity, and small amount of computation

Inactive Publication Date: 2014-04-16
XIDIAN UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0005] The present invention aims at the traditional mDT method applied to airborne MIMO radar clutter suppression, which is restricted by the problems of covariance matrix estimation and large amount of calculation, and still faces the transmit-receive two-dimensional beam in the airspace after Doppler filtering Forming the problem of high computational complexity of the weight vector, a Doppler channel correlation two-level dimensionality reduction method for airborne MIMO radar with small amount of calculation, low computational complexity, and small sample number requirement is proposed

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  • Doppler channel correlation two-stage dimension reduction method for onboard multiple input multiple output (MIMO) radar
  • Doppler channel correlation two-stage dimension reduction method for onboard multiple input multiple output (MIMO) radar
  • Doppler channel correlation two-stage dimension reduction method for onboard multiple input multiple output (MIMO) radar

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Embodiment 1

[0073] The present invention aims at that when the traditional mDT method is applied to airborne MIMO radar clutter suppression, it is restricted by problems such as covariance matrix estimation and calculation amount, and still faces the transmit-receive two-dimensional beamforming in the airspace after Doppler filtering However, the processor dimension is still very high, which limits the practical application of the mDT method. Innovation and research have been carried out, and a Doppler channel correlation two-level dimensionality reduction method for airborne MIMO radar is proposed to further reduce the processor dimension, reducing the amount of computation. see figure 2 , the flow of the Doppler channel correlation two-level dimensionality reduction method of the airborne MIMO radar of the present invention is as follows:

[0074] Step 1. Build a model, the radar antenna receives the clutter reflected by the ground, the present invention utilizes the reference transmi...

Embodiment 2

[0145] The Doppler channel correlation two-level dimensionality reduction method of the airborne MIMO radar is the same as that in Embodiment 1, wherein step 6 utilizes an alternate iterative method to alternately optimize two low-dimensional weight vectors, and calculate the optimal transmission weight vector v and the optimal reception weight vector u, Such as image 3 , the specific process is as follows:

[0146] 6.1 Given the initial values ​​of u and v, take the initial value of u here: u (0) =a r / (a r H a r ), where a r is the steering vector of the target relative to the receiving array; the initial value of v is: in is the steering vector of the target relative to the launch array;

[0147] 6.2 Use the initial value v of the launch weight vector (0) Construct dimensionality reduction matrix And calculate the dimensionality reduction covariance matrix put v (0) and Substituting into the optimal receiving weight vector formula to update the receiving ...

Embodiment 3

[0159] The Doppler channel correlation two-level dimension reduction method of the airborne MIMO radar is the same as that of Embodiment 1-2. In order to further illustrate that the Doppler channel correlation time domain and space domain two-level dimension reduction method of the airborne MIMO radar of the present invention is better than the existing The superiority of the method (such as 1DT, 3DT), the present invention is described again below by simulation, given following simulation conditions:

[0160] The performances of mDT and the dimensionality reduction mDT method of the present invention are compared under the two cases of m=1 and m=3 through numerical simulation. For the case of m=1 (1DT), Doppler filtering in time domain adopts -70dB Chebyshev weighting to suppress the side lobe. The experimental parameters are set as follows: aircraft speed v=150m / s, height h=9km, wavelength λ=0.3m, pulse number K=32, pulse repetition period T r =5×10 -4 s, number of transmi...

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Abstract

The invention discloses a Doppler channel correlation two-stage dimension reduction method for an onboard multiple input multiple output (MIMO) radar. The method includes constructing an onboard MIMO radar clutter signal model and a target space time two-dimensional guide vector; utilizing Doppler filtering to conduct time domain dimension reduction processing on the echo data; resolving weight vectors formed by a space domain transmitting-receiving two-dimensional wave beam into a Kronecker product of a receiving weight and a transmitting weight, building a dyadic and square cost function, utilizing alternative computation to calculate the optimal weight, utilizing the optimal weight to conduct receiving and transmitting two-dimensional self-adaptation wave beam forming and restraining clutter. By means of the method, the dimension of the obtained weight vectors is greatly reduced, optimum covariance matrix estimation can be obtained through less samples, and the clutter restraining performance is greatly improved under small samples. Meanwhile, high-dimensional sampling covariance matrix inversion is avoided, and the calculation quantity is greatly reduced. By means of clutter restraining, further target detection, target location and tracking and flight track forming are facilitated. The method is applied to various actual systems like navigation systems.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and mainly relates to dimensionality reduction processing of radar clutter signals, in particular to a two-level dimensionality reduction method for Doppler channel association of airborne MIMO radar, which can reduce the dimensionality and calculation amount of a processor and the requirement for the number of reference units for clutter suppression of airborne MIMO radar signals. Background technique [0002] In modern warfare, mastering air supremacy is an important guarantee for winning the war. Airborne early warning radar, because it is erected on a very high platform, has a much farther visible distance to low-altitude flying targets than ground radar, so it has been widely valued. When the airborne radar is looking down, the ground clutter not only has a wide range and high intensity, but also the speed of the clutter in different directions relative to the aircraft is di...

Claims

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/292G01S7/2813
Inventor 冯大政向平叶吕晖周延陈磊薛海伟白登潘
Owner XIDIAN UNIV
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