CN110988786B - Array direction-finding calibration method - Google Patents
Array direction-finding calibration method Download PDFInfo
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- CN110988786B CN110988786B CN201911141795.7A CN201911141795A CN110988786B CN 110988786 B CN110988786 B CN 110988786B CN 201911141795 A CN201911141795 A CN 201911141795A CN 110988786 B CN110988786 B CN 110988786B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/023—Monitoring or calibrating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention provides an array direction-finding calibration method, which is characterized in that a calibration signal source is added on an array direction-finding calibration system, and the method is characterized in that a method of combining pre-calibration and real-time calibration is adopted, the relative error between channels and the amplitude-phase error before the channels are calculated and utilized, the amplitude-phase error calibration and the direction consistency calibration of array signals are carried out, and then super-resolution DOA estimation is carried out. According to the invention, by adding the auxiliary signal source and adopting a mode of combining pre-calibration and real-time calibration, the signal source data are collected for real-time calibration during each direction finding, so that the error of the array signal is calibrated efficiently, and the calculation is simple.
Description
Technical Field
The invention relates to the technical field of radio direction finding, in particular to an array direction finding calibration method.
Background
In order to enhance a desired signal, it is often necessary to place a direction-finding station at a plurality of different positions to form an array signal for direction finding. The super-resolution array direction finding technology is an important research direction and is widely applied to the military fields of radars, sonars and the like. With the development of national defense technology, the future war is a high-technology information war, and the super-resolution array direction finding technology occupies an important position in electronic war, but array errors are unavoidable due to factors such as antenna technology, the environment in which the array is positioned and the like; the super-resolution array direction finding has very strict requirements on array consistency, and the array error can cause the increase of direction finding error and even the failure of direction finding. Therefore, the calibration of array errors is particularly important, the existing calibration method comprises an adaptive calibration method and an auxiliary information source calibration method, but the global convergence of the adaptive calibration method is difficult to ensure, and the auxiliary information source is required to be accurately known, so that the method is not suitable for engineering.
The problems are worth solving.
Disclosure of Invention
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a calibration method for array direction-finding is characterized in that a calibration signal source is added on an array direction-finding calibration system, and is characterized in that an array signal amplitude-phase error calibration and direction consistency calibration are carried out by adopting a method combining pre-calibration and real-time calibration, and then super-resolution DOA estimation is carried out.
The invention according to the above scheme is characterized by comprising the following steps:
(1) Setting the array element channel number of the antenna array as M;
(2) Pre-calibrating an auxiliary signal source before an array element channel;
(3) And carrying out real-time calibration on the real-time direction-finding signal source.
Further, the step (2) includes:
(21) Obtaining an amplitude-phase error calibration matrix A by adopting a 0-degree auxiliary signal source method ci ：A ci ＝(A c1 ，A c2 ,……，A cM )；
(22) Collecting calibration signal source data: control each channel to collect calibration signal source data quicklyThe number of beats is M, and is respectively recorded as X Ji ；
(23) Acquiring inter-channel relative error A Ji : normalized by taking channel 1 as a reference and is marked as A Ji ＝X Ji /X J1 ；
(24) Calculating the amplitude-phase error A before the channel Ti ＝A ci /A Ji ；
(25) Will A Ti The value of (2) is stored within the system.
Further, the step (3) includes:
(31) Collecting signal source data to be measured: when each time of direction finding, each channel is controlled to collect signal data to be detected, the snapshot number is M, and the signal data are respectively recorded as X i ＝(X 1 ，X 2 ，……，X M )；
(32) Collecting calibration signal data, i.e. repeating said steps (22) and (23), introducing A Ji A value as a real-time direction-finding calibration matrix;
(33) And (3) calibrating amplitude and phase errors: performing amplitude-phase error calibration on the acquired data of each channel, namely X Ai ＝X i /(A Ji ×A Ti )；
(34) And (3) calibrating direction consistency: with channel 1 as reference, performing alignment of direction consistency, i.e. X AS ＝X Ai /E(X A1 )；
(35) Calculating the identity matrix r=x AS X AS ′。
Further, in the step (21), A c1 ＝1。
Further, in the step (23), A J1 ＝1。
Further, i is a natural number, and 1+.i+.M.
The beneficial effects of the invention are as follows:
by adding the auxiliary signal source and adopting a mode of combining pre-calibration and real-time calibration, the signal source data are collected for real-time calibration during each direction finding, the error of the array signals is efficiently calibrated, the consistency of the array is improved, the accuracy of the array direction finding is improved, and the array direction finding calibration method is simple in calculation and good in engineering applicability.
Drawings
FIG. 1 is a flow chart of an overall implementation of the invention.
FIG. 2 is a flow chart of pre-channel calibration in the present invention.
Fig. 3 is a flow chart of real-time calibration in the present invention.
Detailed Description
The invention provides an array direction-finding calibration method, which solves the problems of complex existing array direction-finding algorithm and inapplicability in engineering, adds an auxiliary signal source of 0 degree on the basis of an original direction-finding system, and calibrates the channel error and the pattern error of an array by adopting a mode of combining pre-calibration and real-time calibration.
As shown in fig. 1 to 3, an array direction-finding calibration method adds a calibration signal source to an array direction-finding calibration system, which specifically includes the following steps:
(1) The number of array element channels of the antenna array is set as M.
(2) Pre-calibrating the auxiliary signal source before the array element channel, comprising:
(21) Obtaining an amplitude-phase error calibration matrix A by adopting a 0-degree auxiliary signal source method ci ：A ci ＝(A c1 ，A c2 ,……，A cM ) I is a natural number, and 1.ltoreq.i.ltoreq.M, wherein A c1 ＝1；
(22) Collecting calibration signal source data: the channels are controlled to collect calibration signal source data, the snapshot number is M, and the snapshot numbers are respectively recorded as X Ji I is a natural number, and 1.ltoreq.i.ltoreq.M;
(23) Acquiring inter-channel relative error A Ji : normalized by taking channel 1 as a reference and is marked as A Ji ＝X Ji /X J1 I is a natural number, and 1.ltoreq.i.ltoreq.M, wherein A J1 ＝1；
(24) Calculating the amplitude-phase error A before the channel Ti ＝A ci /A Ji I is a natural number, and 1.ltoreq.i.ltoreq.M;
(25) Will A Ti The value of (2) is stored within the system.
(3) Real-time calibration of a real-time direction-finding signal source, comprising:
(31) Collecting signal source data to be measured: when each time of direction finding, each channel is controlled to collect signal data to be detected, the snapshot number is M, and the signal data are respectively recorded as X i ＝(X 1 ，X 2 ，……，X M ) I is a natural number, and 1.ltoreq.i.ltoreq.M;
(32) Collecting calibration signal data, i.e. repeating said steps (22) and (23), introducing A Ji A value as a real-time direction-finding calibration matrix;
(33) And (3) calibrating amplitude and phase errors: performing amplitude-phase error calibration on the acquired data of each channel, namely X Ai ＝X i /(A Ji ×A Ti ) I is a natural number, and 1.ltoreq.i.ltoreq.M;
(34) And (3) calibrating direction consistency: with channel 1 as reference, performing alignment of direction consistency, i.e. X AS ＝X Ai /E(X A1 ) I is a natural number, and 1.ltoreq.i.ltoreq.M;
(35) Calculating the identity matrix r=x AS X AS ′。
(4) Super-resolution DOA estimation is performed.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described by means of implementation examples in conjunction with the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Claims (4)
1. The array direction-finding calibration method is characterized in that a calibration signal source is added on an array direction-finding calibration system, and the method is characterized in that the combination of pre-calibration and real-time calibration is adopted to calibrate the amplitude-phase error and the direction consistency of the array signals, and then super-resolution DOA estimation is carried out;
comprises the following steps:
(1) Setting the array element channel number of the antenna array as M;
(2) Pre-calibrating an auxiliary signal source before an array element channel;
(3) Carrying out real-time calibration on a real-time direction-finding signal source;
the step (2) comprises:
(21) Obtaining an amplitude-phase error calibration matrix A by adopting a 0-degree auxiliary signal source method ci ：A ci ＝(A c1 ，A c2 ,……，A cM )；
(22) Collecting calibration signal source data: the channels are controlled to collect calibration signal source data, the snapshot number is M, and the snapshot numbers are respectively recorded as X Ji ；
(23) Acquiring inter-channel relative error A Ji : normalized by taking channel 1 as a reference and is marked as A Ji ＝X Ji /X J1 ；
(24) Calculating the amplitude-phase error A before the channel Ti ＝A ci /A Ji ；
(25) Will A Ti Is stored in the system;
the step (3) comprises:
(31) Collecting signal source data to be measured: when each time of direction finding, each channel is controlled to collect signal data to be detected, the snapshot number is M, and the signal data are respectively recorded as X i ＝(X 1 ，X 2 ，……，X M )；
(32) Collecting calibration signal data, i.e. repeating said steps (22) and (23), introducing A Ji A value as a real-time direction-finding calibration matrix;
(33) And (3) calibrating amplitude and phase errors: performing amplitude-phase error calibration on the acquired data of each channel, namely X Ai ＝X i /(A Ji ×A Ti )；
(34) And (3) calibrating direction consistency: with channel 1 as reference, performing alignment of direction consistency, i.e. X AS ＝X Ai /E(X A1 )；
(35) Calculating the identity matrix r=x AS X AS ′。
2. The method of calibrating direction-finding of an array according to claim 1, wherein a in said step (21) c1 ＝1。
3. According to claimThe method for calibrating direction-finding of an array according to claim 1, wherein A in the step (23) J1 ＝1。
4. The method of claim 1, wherein i is a natural number and 1+.i+.m.
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