Space time code three-dimensional self-adaptation clutter cancelling method for onboard multiple input multiple output (MIMO) radar

An adaptive clutter and clutter canceller technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as good clutter suppression performance, increased computational complexity, and increased number of samples, and achieves good clutter control. The effect of eliminating performance and reducing degrees of freedom

Inactive Publication Date: 2014-04-16
XIDIAN UNIV
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  • Abstract
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Problems solved by technology

The classic dimensionality reduction STAP methods include auxiliary channel method (ACR), factorized space-time adaptive processing FA method and expanded factorized space-time adaptive processing EFA method, all of which can obtain better performance under ideal conditions, but in practice In this case, the array error is unavoidable, and the space-time two-dimensional clutter spectrum spreads out along the space dimension due to the space-domain error, and the degree of freedom of the clutter is greatly increased. Good clutter suppression performance can be obtained. It can be seen that in order to improve the clutter suppression performance, it is necessary to increase the adaptive degree of freedom. However, when the degree of freedom increases, the above method will bring the problem of increasing the number of samples and increasing the amount of calculation, which makes The above method cannot obtain better clutter suppression performance in practical engineering applications

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  • Space time code three-dimensional self-adaptation clutter cancelling method for onboard multiple input multiple output (MIMO) radar
  • Space time code three-dimensional self-adaptation clutter cancelling method for onboard multiple input multiple output (MIMO) radar
  • Space time code three-dimensional self-adaptation clutter cancelling method for onboard multiple input multiple output (MIMO) radar

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Embodiment 1

[0081]The present invention has carried out innovation and research aimed at the problem of greatly increasing the degree of freedom of clutter caused by array errors and high computational complexity in clutter suppression in the prior art. The airborne MIMO radar space-time code provided by the present invention The three-dimensional adaptive clutter cancellation method is used in radar signal processing. Airborne early warning radar, because it is set up on a very high platform, has a much farther visual 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 clutter in different directions has different speeds relative to the aircraft, which greatly broadens the clutter spectrum. For this reason, the amount of clutter in the airborne radar is much larger than that of ordinary radars, and the traditional clutter suppressio...

Embodiment 2

[0120] Airborne MIMO radar space-time code three-dimensional adaptive clutter cancellation method is the same as embodiment 1, wherein step 2. According to the echo vector model, calculate the residual echo signal energy of two adjacent pulses||ε k || 2 , the specific process includes the following:

[0121] 2.1 According to the signal model of the kth pulse echo of the airborne MIMO radar in formula (3), the echo of the k+1th pulse is obtained as

[0122] x k+1 =[x 0,0,k+1 , x 1,0,k+1 , …, x N-1,M-1,k+1 ] T ,

[0123] 2.2 Perform clutter cancellation on the echo of the k+1 pulse and the echo of the k pulse to obtain the energy of the remaining echo signal||ε k || 2 for

[0124] ||ε k || 2 =||Qx k -x k+1 || 2 ,

[0125] In the formula, Q is the coefficient matrix of the clutter canceller, and ||·|| is the 2-norm of the vector.

[0126] The clutter cancellation processing goal of the space-time adaptive clutter canceller is to optimize the coefficient matrix Q o...

Embodiment 3

[0128] Airborne MIMO radar space-time code three-dimensional adaptive clutter cancellation method is the same as embodiment 1-2, wherein step 3. Minimize residual echo signal energy ||ε k || 2 , to obtain the coefficient matrix Q of the clutter canceller, the specific process includes the following:

[0129] 3.1 The residual echo signal energy ||ε k || 2 minimize, that is, where min represents the minimization function:

[0130] min Q E ( | | ϵ k | | 2 ) = min ...

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Abstract

The invention discloses a space time code three-dimensional self-adaptation clutter cancelling method for onboard multiple input multiple output (MIMO) radar. The method includes first building an onboard MIMO radar echo signal model, calculating residue echo signal energy, minimizing the echo signal energy to obtain a self-adaptation clutter canceller coefficient compensation device, acquiring a space time code three-dimensional self-adaptation clutter canceller through sliding window arrangement, utilizing the canceller to cancel echo signals and cancelling most clutter through preprocessing of the space time code three-dimensional self-adaptation clutter canceller. The method is used before a common space time code processing method and a dimension reducing STAP method to conduct space time code three-dimensional canceling on the clutter in the onboard MIMO radar echo signals, the clutter can be effectively restrained in the first stage of radar signal processing, and detection performance of a moving target is improved. The method is applicable to both positive side looking radars and non-positive side looking radars, and has good moving target detection capability.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and mainly relates to a space-time code three-dimensional adaptive clutter canceller (Space-Time Adaptive Clutter Canceller, STACC), specifically an airborne MIMO radar space-time code three-dimensional adaptive clutter Cancellation method. It can be applied to the airborne MIMO radar system, not only for the side-looking MIMO radar, but also for the non-front-side looking MIMO radar. Background technique [0002] The clutter canceller is the earliest and most commonly used MTI filter. It was first used in ground-based radar. Since the ground clutter signals received by the ground radar are mostly concentrated near the 0 frequency of the Doppler frequency, the clutter canceller can Think of it as an effective high-pass filter that suppresses low-frequency clutter. However, for the airborne MIMO (multiple-input multiple-output) radar platform, since the platform is moving, the gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/2928
Inventor 冯大政向平叶曹杨周延朱国辉袁明冬
Owner XIDIAN UNIV
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