CN106646545A - Undistorted space-time adaptive anti-interference processing method of BOC signal - Google Patents

Abstract

Aiming at the problem that correlation peaks are seriously distorted after space-time adaptive anti-interference processing of a BOC signal, the invention provides an undistorted space-time adaptive anti-interference processing method of the BOC signal. Interference suppression is carried out by adopting a traditional MVDR principle, and then signal accumulation on different time delays is carried out at an array output end, so that the purpose of no navigation signal distortion can be realized. The method is applicable to the conditions of random formation, random interference signal frequency and random interference amount.

Description

A kind of undistorted space-time adaptive anti-interference processing method of BOC signals

Technical field

The present invention relates to array signal process technique field, particularly antenna array Anti-Jamming Technique, more particularly to Satellite navigation receiver antenna battle array anti-interference processing method.

Background technology

The good characteristic of antenna array Anti-Jamming Technique makes it in high-end GNSS (Global Navigation Satellite System) it is widely applied in receiver.Least mean-square error undistorted (MVDR, Minimum are applied in antenna array Variance Distortionless Response) criterion, null not only can be formed to suppress interference, together in interference radiating way When can be forming wave beam strengthening signal in sense.Space-time adaptive process has superior interference free performance, not The free degree of array can be increased while increasing element number of array.

MVDR criterions are applied to into space-time adaptive to process, the distortion of navigation signal relevant peaks can be caused, even result in phase Close the skew of peak position.The distortion of relevant peaks can cause the tracking accuracy of track loop in navigation neceiver to reduce, and relevant peaks The skew of position can then cause tracking result to produce deviation, so as to reduce the positioning precision of navigation neceiver.

The related variance of peak that solution space-time adaptive processor brings is favorably improved the positioning precision of navigation neceiver. Under conditions of noiseless, single antenna, the relevant peaks of BOC signals are presented the phenomenon of multimodal, which increase navigation signal capture, tracking Difficulty, related variance of peak will be further increased capture, the difficulty for tracking caused by antenna array.

The content of the invention

For BOC signals, after space-time adaptive anti-interference process there is the problem of Severe distortion, the present invention in relevant peaks Propose a kind of undistorted space-time adaptive anti-interference processing method of BOC signals.The technical problem to be solved in the present invention is profit The navigation signal after space-time adaptive anti-interference process is carried out with antenna array carries out undistorted process, is caught with solving navigation signal Obtain, track the problem of difficulty.

The technical scheme is that：

A kind of undistorted space-time adaptive anti-interference processing method of BOC signals, comprises the following steps：

(1) space-time adaptive processor input data is generated, is represented by：

X (t)=[X^T(t) X^T(t-T) … X^T(t-(M-1)T)]^T (1)

Wherein, X (t) is the data of antenna array collection, and M is the time-domain taps number that space-time adaptive is processed, and T is the sampling of AD Cycle.

(2) correlation matrix is estimated.

The data being an actually-received are time-limited, and the maximal possibility estimation of the correlation matrix of receiving data is：

In above formula, L is fast umber of beats.

(3) weights are generated.Weights are generated by MVDR criterions, and the constraints of MVDR criterions is：

In above formula, θ_sFor the arrival bearing of signal, can be obtained by sensors such as inertial navigations.a(θ_s) leading for sense To vector, w is array element weight vector, w^HFor the conjugate transposition of w.

The steady state solution of above-mentioned constraints is：

(4) anti-interference process, the space-time adaptive to generating processes input data and is weighted：

Y (t)=w^Hx(t) (5)

(5) the undistorted process of navigation signal.

In above formula, i is the sequence number of time-domain taps number, and meets 0≤i≤M-1.

The undistorted purpose of navigation signal is capable of achieving by the way that the output signal of above formula is cumulative.

The Advantageous Effects of the present invention：

AF panel is carried out using traditional MVDR criterions, then the signal carried out in different delay in array output end tires out Plus, it is capable of achieving the undistorted purpose of navigation signal.The inventive method is applied to any formation (linear array, planar array, solid Array etc.), the situation of any interference signal frequency and any amount of interference.

Description of the drawings

Fig. 1 is the flow chart of the present invention；

Fig. 2 is the design sketch of the present invention.

Specific embodiment

To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention Formula is described in further detail.

It is the flow chart of the present invention with reference to Fig. 1, the signal and interference that wherein antenna array is received is radiofrequency signal, to antenna Battle array receives signal and interference is pre-processed, and pretreatment contains analog down, AD samplings, Digital Down Convert etc. and processed Journey, based on the data of the antenna array collection after pretreatment, the present invention proposes that a kind of undistorted space-time adaptive of BOC signals resists Interference processing method, comprises the following steps：

(1) space-time adaptive processor input data is generated, is represented by：

X (t)=[X^T(t) X^T(t-T) … X^T(t-(M-1)T)]^T (1)

Wherein, X (t) is the data of antenna array collection, and M is the time-domain taps number that space-time adaptive is processed, and T is the sampling of AD Cycle.

(2) correlation matrix is estimated.

The data being an actually-received are time-limited, and the maximal possibility estimation of the correlation matrix of receiving data is：

In above formula, L is fast umber of beats.

(3) weights are generated.Weights are generated by MVDR criterions, and the constraints of MVDR criterions is：

In above formula, θ_sFor the arrival bearing of signal, can be obtained by sensors such as inertial navigations.a(θ_s) leading for sense To vector, w is array element weight vector, w^HFor the conjugate transposition of w.

The steady state solution of above-mentioned constraints is：

(4) anti-interference process, the space-time adaptive to generating processes input data and is weighted：

Y (t)=w^Hx(t) (5)

(5) the undistorted process of navigation signal.

In above formula, i is the sequence number of time-domain taps number, and meets 0≤i≤M-1.

The undistorted purpose of navigation signal is capable of achieving by the way that the output signal of above formula is cumulative.

Fig. 2 is the design sketch of the inventive method.First five figure is respectively the relevant peaks of different delays data, occurs in that abnormal Become, and the position of relevant peaks is different, last figure is the design sketch of the inventive method, only includes a relevant peaks, and On 0, the inventive method solves the problems, such as that space-time adaptive is processed and causes distorted signals peak.

The explanation of the preferred embodiment of the present invention contained above, this be in order to describe the technical characteristic of the present invention in detail, and Be not intended to that the content of the invention is limited in the concrete form described by embodiment, carry out according to present invention purport other Modification and modification are also protected by this patent.The purport of present invention is to be defined by the claims, rather than by embodiment Specific descriptions are defined.

Claims (1)

1. the undistorted space-time adaptive anti-interference processing method of a kind of BOC signals, it is characterised in that comprise the following steps：

(1) space-time adaptive processor input data is generated, is represented by：

X (t)=[X^T(t) X^T(t-T) … X^T(t-(M-1)T)]^T (1)

Wherein, X (t) is the data of antenna array collection, and M is the time-domain taps number that space-time adaptive is processed, and T is the sampling week of AD Phase；

(2) correlation matrix is estimated

The data being an actually-received are time-limited, and the maximal possibility estimation of the correlation matrix of receiving data is：

$\begin{array}{c}{R}_{xx}=E\[x\left(t\right)x^H\left(t\right)\]\\ =\frac{1}{L}\underset{i=1}{\overset{L}{\Σ}}x\left(i\right)x^H\left(i\right)\end{array}---\left(2\right)$

In above formula, L is fast umber of beats；

(3) weights are generated

Weights are generated by MVDR criterions, and the constraints of MVDR criterions is：

$\left\{\begin{array}{c}\underset{w}{\min }\left\{w^H{R}_{xx}w\right\}\\ w^{H}a\left({\mathrm{\θ}}_s\right)=1\end{array}\right.---\left(3\right)$

In above formula, θ_sFor the arrival bearing of signal, a (θ_s) for sense steering vector, w be array element weight vector, w^HFor w's Conjugate transposition；

The steady state solution of above-mentioned constraints is：

$w=R_{xx}^{-1}a\left({\mathrm{\θ}}_s\right)---\left(4\right)$

(4) anti-interference process, the space-time adaptive to generating processes input data and is weighted：

Y (t)=w^Hx(t) (5)

(5) the undistorted process of navigation signal

$y^{\′}\left(t\right)=\underset{i=0}{\overset{M-1}{\Σ}}y(t-iT)---\left(6\right)$

In above formula, i is the sequence number of time-domain taps number, and meets 0≤i≤M-1；

The undistorted purpose of navigation signal is capable of achieving by the way that the output signal of above formula is cumulative.