CN115343669A - Interferometer direction finding method and system adopting far-end reference array element - Google Patents
Interferometer direction finding method and system adopting far-end reference array element Download PDFInfo
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- CN115343669A CN115343669A CN202210809216.7A CN202210809216A CN115343669A CN 115343669 A CN115343669 A CN 115343669A CN 202210809216 A CN202210809216 A CN 202210809216A CN 115343669 A CN115343669 A CN 115343669A
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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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- 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
- G01S3/04—Details
- G01S3/12—Means for determining sense of direction, e.g. by combining signals from directional antenna or goniometer search coil with those from non-directional antenna
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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
- G01S3/46—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
- G01S3/48—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
Abstract
The invention provides an interferometer direction finding method and system adopting a far-end reference array element, wherein the method comprises the following steps: selecting a far-end reference array element on the basis of a conventional interferometer array element; carrying out ambiguity resolution operation of direction finding by using array elements of a conventional interferometer to obtain a direction finding result A; combining the array elements of the conventional interferometer and the introduced far-end reference array elements in pairs at will, and sequencing the plurality of combinations from short to long according to the length of a base line between the two array elements in the combinations; respectively carrying out interferometer direction finding on the combinations, and resolving ambiguity of direction finding results B of the combinations according to the direction finding results A; according to the fact that random fluctuation of the phase difference is statistically close to the average value of 0 in the direction finding process, invalid direction finding results of a plurality of fuzzy azimuth values in the direction finding results containing the array element M combination are removed, and a final direction finding result is obtained. The system is used for realizing the method. The ambiguity is resolved by utilizing the statistical characteristics, and the method can be used as an important supplement of the current conventional interferometer system to obtain the improvement of the direction finding precision.
Description
Technical Field
The invention relates to the technical field of radio direction finding, in particular to an interferometer direction finding method and system adopting a remote reference array element.
Background
The interferometer system is widely applied to the direction finding field due to simple composition and high direction finding precision. It is the simplest direction finding mode and is the basis of other direction finding methods.
The influence factors of the direction-finding precision of the direction-finding mode mainly include the nonlinear influence of the antenna housing, the antenna installation error, the response of the antenna to incoming waves in different directions, the deterioration of an internal correction table caused by the temperature change of the module, the maximum base length of an antenna array element and the like. Except the maximum base length of the antenna array element, other factors can be reduced by adopting an external correction or internal correction mode. The maximum base length of the antenna array element is generally limited by the actual installation size and cannot be increased at will, so that the direction-finding accuracy is difficult to further improve.
However, in practical application, the direction-finding accuracy of the existing interferometer is difficult to meet the requirement of high accuracy, and further improvement of the direction-finding accuracy of the interferometer is needed urgently.
Disclosure of Invention
The invention aims to at least solve one of the technical problems that when an interferometer system is adopted for direction finding, the influence factor of the maximum base length of an antenna array element is difficult to correct, and the direction finding precision cannot meet the requirement of high precision in the prior art.
To this end, the invention provides in a first aspect an interferometric direction finding method using a remote reference array element.
In a second aspect, the invention provides an interferometer direction-finding system using a remote reference array element.
The invention provides an interferometer direction finding method adopting a remote reference array element, which comprises the following steps:
s1, selecting a far-end reference array element M on the basis of array elements 1-N of a conventional interferometer;
s2, correcting array elements 1-N of the conventional interferometer and a far-end reference array element M;
s3, carrying out direction finding application on the corrected data, and carrying out direction finding ambiguity resolving operation by using array elements 1-N of the conventional interferometer to obtain a direction finding result A;
s4, combining the array elements 1-N of the conventional interferometer and the introduced far-end reference array element M in N +1 array elements in pairs at will, and sequencing a plurality of combinations according to the length of a base line between the two array elements in the combinations;
s5, respectively carrying out interferometer direction finding on the plurality of combinations established in the S4, and carrying out ambiguity resolution on direction finding results B of the plurality of combinations according to the direction finding result A of the S3 to eliminate invalid direction finding results; wherein, the array element M does not satisfy the ambiguity resolution condition, at least part of direction finding results of the combination containing the array element M are invalid direction finding results, namely, the combination containing the array element M is subjected to interferometer direction finding to obtain a plurality of ambiguity orientation values;
s6, according to the fact that random fluctuation of the phase difference is close to the average value to be 0 statistically in the direction finding process, removing invalid direction finding results of a plurality of fuzzy orientation values in the direction finding results containing the array element M combination, and obtaining the final direction finding result.
According to the interferometer direction finding method adopting the remote reference array element in the technical scheme of the invention, the method can also have the following additional technical characteristics:
in the above technical solution, in S6, according to that the random fluctuation of the phase difference should statistically approach to an average value of 0 in the direction finding process, removing the invalid direction finding result of a plurality of fuzzy orientation values in the direction finding result containing the array element M combination, includes the following steps:
s61, counting all fuzzy orientation values of the combination with the longest base line length;
s62, calculating the phase difference of the two array elements in the combination when the direction finding result is any one fuzzy orientation value in the S61 except the combination with the longest base line length to obtain a reference phase difference;
s63, calculating the difference value between the reference phase difference and the actual phase difference of any combination except the combination with the longest base line length, calculating the average value of the difference values, and taking the calculation result as the random fluctuation value of the phase difference;
s64, repeating the steps S62 to S63 on all the fuzzy azimuth values in the S61 to obtain corresponding phase difference random fluctuation values;
and S65, selecting a fuzzy orientation value corresponding to the phase difference random fluctuation value with the minimum absolute value as a final direction finding result.
In the above technical solution, in S62, the reference phase difference is calculated as follows:
PH_diff_i＝L*sin(theata1)/lamda*2*pi＝L*sin(theata1)/c*f*2*pi；
wherein i represents the ith combination in other combinations except the combination with the longest base length; PH _ diff _ i represents the reference phase difference of the ith combination; l represents the distance between the array element 1 and the array element N of the conventional interferometer; lamda is the signal wavelength; c is the speed of light; f is the signal frequency; theta 1 is the angle of incidence.
In any of the above technical solutions, the selection principle of the remote reference array element M in S1 is as follows: the far-end reference array element and the conventional interferometer are respectively positioned at the edge of the installation range of the installation platform, the far-end reference array element and the conventional interferometer are oppositely arranged, and the far-end reference array element is positioned on a horizontal line formed by the conventional interferometer array elements.
In any of the above technical solutions, the method for correcting the array elements 1 to N of the conventional interferometer in S2 is to perform data correction by using the correction tables of the array elements 1 to N of the conventional interferometer.
In any of the above technical solutions, performing a direction finding deblurring operation by using the array elements 1 to N of the conventional interferometer in S3, and obtaining a direction finding result includes:
PhN-Ph1＝L*sin(theata1)/lamda*2*pi＝L*sin(theata1)/c*f*2*pi；
theata1＝asin[(Ph1-Ph1)/(2*pi)/f*c/L]；
the phase positions of PhN and Ph1 are the phases of array elements N and 1 of the conventional interferometer respectively; l represents the distance between the array element 1 and the array element N of the conventional interferometer; lamda is the signal wavelength; c is the speed of light; f is the signal frequency; theta 1 is the angle of incidence.
In any of the above technical solutions, in S4, the combinations are sorted from short to long according to the length of the base line between two array elements in the combination.
The invention also provides an interferometer direction-finding system adopting the remote reference array element, which is used for the interferometer direction-finding method adopting the remote reference array element in any one of the technical schemes and comprises a remote reference array element module and a conventional interferometer module.
In the above technical solution, at least two of the conventional interferometer modules are respectively connected to the remote reference array element module.
In the above technical solution, the remote reference array element module employs a unit antenna;
the unit antenna is connected with the conventional interferometer module through a radio frequency cable, or
Still include local collection extension, unit antenna and local collection extension signal connection, the local collection extension passes through light signal and links to each other with conventional interferometer module.
In summary, due to the adoption of the technical characteristics, the invention has the beneficial effects that:
the interferometer direction-finding method and system adopting the far-end reference array element can utilize the installation space as much as possible in the application occasions such as the ground, the airplane, the ship-borne and the like, improve the length of a base line on the premise of not considering the precision reduction, solve the ambiguity by utilizing the statistical characteristics, can be used as an important supplement of the current conventional interferometer system, obtain the improvement of the direction-finding precision and have important significance.
Specifically, only one unit antenna far away from the conventional interferometer system can be additionally arranged, so that the length of the base line of the conventional interferometer system is obviously improved, and the direction-finding precision is greatly improved.
The direction-finding blur caused by the far-end reference array elements is removed by using a statistical method, the problem of the direction-finding blur is solved to a certain extent, and the direction-finding result is more accurate along with the increase of the number of the conventional array elements.
A far-end reference array element and double-station interferometer system can be constructed, on the basis of realizing high-precision direction finding of a single interferometer, high-precision cross positioning of double stations is realized, and the problem of short baseline positioning is solved.
The 'far-end reference array element' can be arranged in the middle, and the other two conventional interferometers are respectively arranged at the head end and the tail end of the airplane, so that the length of the airplane is fully utilized as a base line, and the instantaneous direction finding and positioning accuracy of a single machine is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method of interferometer direction finding using a remote reference array element according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a method for removing ambiguity orientation values in an interferometer direction-finding method using a remote reference array element according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an interferometric direction-finding method using a remote reference array element, in accordance with one embodiment of the present invention;
FIG. 4 is a schematic diagram of an interferometer direction-finding system using a remote reference array element in accordance with one embodiment of the present invention;
FIG. 5 is a schematic diagram of a conventional interferometer direction finding method.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
An interferometer direction finding method using a remote reference array element according to some embodiments of the present invention is described below with reference to fig. 1 to 5.
Some embodiments of the present application provide an interferometer direction finding method that employs a remote reference array element.
As shown in fig. 1 to 5, a first embodiment of the present invention provides an interferometer direction-finding method using a remote reference array element, comprising the following steps:
s1, selecting a far-end reference array element M on the basis of array elements 1-N of a conventional interferometer;
the selection principle of the far-end reference array element M in the S1 is as follows: in order to ensure that the baseline lifting is as large as possible, the far-end reference array element and the conventional interferometer are respectively positioned at the edge of the mountable range of the mounting platform and are oppositely arranged, and the far-end reference array element is positioned on a horizontal line formed by the array elements of the conventional interferometer; the distance between the far-end reference array element and the conventional interferometer array element 1 is L General assembly (ii) a The distance from the array element 1 to the array element N of the conventional interferometer is L.
The far-end reference array element and the linear array of the conventional interferometer do not intersect on the same horizontal line, but are positioned at the same height and not on the same surface. However, this situation is much more complicated, and it is necessary to measure and store the phase difference of incoming waves in any direction in advance, and to perform direction finding by using a method similar to a correlation interferometer.
S2, correcting array elements 1-N of the conventional interferometer and a far-end reference array element M;
the method for correcting array elements 1-N of the conventional interferometer in S2 is to use the correction tables of array elements 1-N of the conventional interferometer to correct data.
S3, carrying out direction finding application on the corrected data, and carrying out direction finding ambiguity resolving operation by using array elements 1-N of the conventional interferometer to obtain a direction finding result A;
in S3, carrying out ambiguity resolution operation of direction finding by using array elements 1-N of the conventional interferometer, and obtaining a direction finding result, wherein the direction finding result comprises the following steps:
PhN-Ph1＝L*sin(theata1)/lamda*2*pi＝L*sin(theata1)/c*f*2*pi；
theata1＝asin[(Ph1-Ph1)/(2*pi)/f*c/L]；
wherein PhN and Ph1 are the phases of array element N and array element 1 of the conventional interferometer respectively; l represents the distance between the array element 1 and the array element N of the conventional interferometer; lamda is the signal wavelength; c is the speed of light; f is the signal frequency; theta 1 is the angle of incidence.
The deblurred direction finding result D1 is not blurred, but a certain direction finding error e1 exists, and the direction finding result can be recorded as D1 +/-e 1.
S4, combining the array elements 1-N of the conventional interferometer and the introduced far-end reference array element M in N +1 array elements in pairs at will, and sequencing a plurality of combinations according to the length of a base line between the two array elements in the combinations;
s4, sequencing a plurality of combinations according to the length of the base line between two array elements in the combinations from short to long, wherein the specific combination sequencing conditions are shown in the following table:
| combination numbering | Combined (two array element serial number) |
| V1 | 1,2 |
| V2 | 2,3 |
| V3 | 1,3 |
| …… | …… |
| V_C 2 N+1 | 1,M |
Wherein, C 2 N+1 It is shown that any two array elements of N +1 array elements are mathematically combined in order.
S5, respectively carrying out interferometer direction finding on the plurality of combinations established in the S4, and carrying out ambiguity resolution on direction finding results B of the plurality of combinations according to the direction finding result A of the S3 to eliminate invalid direction finding results; the array element M is far away from the array antenna array of the interferometer, and has no fixed distance value and can be adjusted according to installation conditions, so that the array element M does not meet the ambiguity resolution condition, at least part of direction finding results of the combination containing the array element M are invalid direction finding results, namely, a plurality of fuzzy orientation values are obtained after the interferometer direction finding is carried out on the combination containing the array element M, and the combination not containing the array element M only has one direction finding value;
as shown in fig. 2, in which the black lines of the double arrows indicate actual target azimuth values, and the open squares indicate the measurement values of the target azimuth values obtained by each combination; the solid circle represents the fuzzy orientation value of the combined direction-finding containing the array element M, and the fuzzy orientation value cannot be removed by using a conventional method; the open circles represent the fuzzy orientation values removed by comparison with the combined open square ranges without array elements M.
S6, according to the fact that random fluctuation of the phase difference is close to the average value to be 0 statistically in the direction finding process, removing invalid direction finding results of a plurality of fuzzy orientation values in the direction finding results containing the array element M combination, and obtaining the final direction finding result.
In S6, according to that the random fluctuation of the phase difference statistically approaches to an average value of 0 in the direction finding process, removing the invalid direction finding result of a plurality of fuzzy orientation values in the direction finding result containing the array element M combination, the method includes the following steps:
s61, counting all fuzzy orientation values of the combination with the longest base line length;
the combination with the longest base line length, namely the combination of the array element 1 and the array element M, and all fuzzy orientation values of the combination with the longest base line length are marked as D _ H = { D _ H _1, D _H _2, D _H _3, … …, D _ H _ i, … … and D _ H _ n };
s62, calculating the phase difference of the two array elements in the combination when the direction finding result is any one fuzzy orientation value in the S61 except the combination with the longest base line length to obtain a reference phase difference;
calculating the phase difference of the two array elements in the combination when the direction finding result of other combinations except the combination with the longest base line length is any fuzzy orientation value in S61 to obtain a reference phase difference;
if the reference phase difference corresponding to each combination when the fuzzy azimuth value is D _ H _1 is calculated, calculating the phase difference of two array elements under the condition that the direction finding result is D _ H _1 under other P combinations except the combination with the longest base length;
in S62, the reference phase difference is calculated as follows:
PH_diff_i＝L*sin(theata1)/lamda*2*pi＝L*sin(theata1)/c*f*2*pi；
wherein i represents the ith combination in other combinations except the combination with the longest base length; PH _ diff _ i represents the reference phase difference of the ith combination; l represents the distance between the array element 1 and the array element N of the conventional interferometer; lamda is the signal wavelength; c is the speed of light; f is the signal frequency; theta 1 is the angle of incidence.
S63, calculating the difference value between the reference phase difference and the actual phase difference of any combination except the combination with the longest base line length, calculating the average value of the difference values, and taking the calculation result as the random fluctuation value of the phase difference;
when the direction finding result is D _ H _1, the difference value between the actual phase difference of the two array elements in the P combination and the corresponding reference phase difference is obtained to obtain P results, and the average value of the P results is obtained to obtain the random fluctuation value M1 of the phase difference;
s64, repeating the steps S62-S63 for all the fuzzy azimuth values in the S61 to obtain corresponding phase difference random fluctuation values;
namely, the direction finding results are D _ H _2, D _H _3, … …, D _ H _ i, … … and D _ H _ n, which are respectively calculated by steps S62 to S63, and corresponding phase difference random fluctuation values M2, M3 … …, mi, … … and Mn are obtained.
And S65, selecting a fuzzy orientation value corresponding to the phase difference random fluctuation value with the minimum absolute value as a final direction finding result.
And selecting a fuzzy azimuth value corresponding to the minimum value of M, if the absolute value of Mi is minimum, and at the moment, D _ H _ i is the final non-fuzzy azimuth value and is the final direction measurement result.
The second embodiment of the present invention provides an interferometer direction-finding system using a remote reference array element, and on the basis of the first embodiment, as shown in fig. 1 to 5, the interferometer direction-finding method using a remote reference array element according to the above embodiments includes a remote reference array element module and a conventional interferometer module.
The long-distance reference array element module and the conventional interferometer module belong to different physical compositions, are physically separated and are set up in order to fully utilize the mountable size of the carrier platform as a baseline of the interferometer, and the physical distance between the long-distance reference array element module and the conventional interferometer module can reach dozens of meters or even hundreds of meters.
And at least two conventional interferometer modules are respectively connected with the far-end reference array element module.
The two conventional interferometer modules and the remote reference array element module are connected in a cascading mode, high-precision single-station direction finding is achieved, then two-station cross positioning can be conducted, and the problem of short baseline positioning is solved.
The far-end reference array element module adopts a unit antenna;
the unit antenna is connected with the conventional interferometer module through a radio frequency cable, and is transmitted to the conventional interferometer module through a radio frequency cable to be used as the input of the conventional interferometer module;
still include local collection extension, unit antenna and local collection extension signal connection, the local collection extension passes through light signal and links to each other with conventional interferometer module.
In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An interferometer direction finding method adopting a far-end reference array element is characterized by comprising the following steps:
s1, selecting a far-end reference array element M on the basis of array elements 1-N of a conventional interferometer;
s2, correcting array elements 1-N of the conventional interferometer and a far-end reference array element M;
s3, carrying out direction finding application on the corrected data, and carrying out direction finding ambiguity resolving operation by using array elements 1-N of the conventional interferometer to obtain a direction finding result;
s4, combining the array elements 1-N of the conventional interferometer and the introduced far-end reference array element M in N +1 array elements in pairs at will, and sequencing a plurality of combinations according to the length of a base line between the two array elements in the combinations;
s5, interferometer direction finding is respectively carried out on the plurality of combinations established in the S4, ambiguity resolution is carried out on direction finding results of the plurality of combinations according to the direction finding result of the S3, and invalid direction finding results are eliminated; wherein, the array element M does not satisfy the ambiguity resolution condition, at least part of direction finding results of the combination containing the array element M are invalid direction finding results, namely, the combination containing the array element M is subjected to interferometer direction finding to obtain a plurality of ambiguity orientation values;
s6, according to the fact that random fluctuation of the phase difference is close to the average value to be 0 statistically in the direction finding process, removing invalid direction finding results of a plurality of fuzzy orientation values in the direction finding results containing the array element M combination, and obtaining the final direction finding result.
2. The method of claim 1, wherein in step S6, based on that the random fluctuation of the phase difference during the direction finding process statistically approaches to an average value of 0, the method for removing invalid direction finding results of a plurality of fuzzy orientation values in the direction finding results containing the array element M combination comprises the following steps:
s61, counting all fuzzy orientation values of the combination with the longest base line length;
s62, calculating the phase difference of the two array elements in the combination when the direction finding result is any one fuzzy orientation value in the S61 except the combination with the longest base line length to obtain a reference phase difference;
s63, calculating the difference value between the reference phase difference and the actual phase difference of any combination except the combination with the longest base line length, calculating the average value of the difference values, and taking the calculation result as the random fluctuation value of the phase difference;
s64, repeating the steps S62 to S63 on all the fuzzy azimuth values in the S61 to obtain corresponding phase difference random fluctuation values;
and S65, selecting a fuzzy orientation value corresponding to the phase difference random fluctuation value with the minimum absolute value as a final direction finding result.
3. The method according to claim 2, wherein the reference phase difference is calculated in S62 as follows:
PH_diff_i＝L*sin(theata1)/lamda*2*pi＝L*sin(theata1)/c*f*2*pi
wherein i represents the ith combination in other combinations except the combination with the longest base length; PH _ diff _ i represents the reference phase difference of the ith combination; l represents the distance between the array element 1 and the array element N of the conventional interferometer; lamda is the signal wavelength; c is the speed of light; f is the signal frequency; theta 1 is the angle of incidence.
4. An interferometer direction-finding method using a remote reference array element according to any one of claims 1 to 3, wherein the selection principle of the remote reference array element M in S1 is as follows: the far-end reference array element and the conventional interferometer are respectively positioned at the edge of the installation range of the installation platform, the far-end reference array element and the conventional interferometer are oppositely arranged, and the far-end reference array element is positioned on a horizontal line formed by the conventional interferometer array elements.
5. An interferometer direction finding method using a remote reference array element as claimed in any one of claims 1 to 3 wherein the calibration of the conventional interferometer array elements 1 to N in S2 is performed by using a calibration table of the conventional interferometer array elements 1 to N for data calibration.
6. The method as claimed in any one of claims 1 to 3, wherein the step of performing ambiguity resolution of direction finding by using a conventional interferometer array element 1-N in S3, and obtaining a direction finding result comprises:
PhN-Ph1＝L*sin(theata1)/lamda*2*pi＝L*sin(theata1)/c*f*2*pi
theata1＝asin[(Ph1-Ph1)/(2*pi)/f*c/L]
the phase positions of PhN and Ph1 are the phases of array elements N and 1 of the conventional interferometer respectively; l represents the distance between the array element 1 and the array element N of the conventional interferometer; lamda is the signal wavelength; c is the speed of light; f is the signal frequency; theta 1 is the angle of incidence.
7. A method of interferometric direction finding using a remote reference array element as claimed in any one of claims 1 to 3 characterised in that the plurality of combinations are ordered in S4 according to the length of the base line between two array elements in the combination from short to long.
8. An interferometer direction-finding system using a remote reference array element, for use in an interferometer direction-finding method using a remote reference array element as claimed in any one of claims 1 to 7, comprising a remote reference array element module and a conventional interferometer module.
9. An interferometer direction-finding system using a remote reference array element according to claim 8, wherein at least two of the conventional interferometer modules are each connected to the remote reference array element module.
10. The system of claim 8, wherein the remote reference array element module is a cellular antenna;
the unit antenna is connected with the conventional interferometer module through a radio frequency cable, or
Still include local collection extension, unit antenna and local collection extension signal connection, the local collection extension passes through light signal and links to each other with conventional interferometer module.
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| CN116359835A (en) * | 2023-05-15 | 2023-06-30 | 中国人民解放军火箭军工程大学 | Y-type baseline interferometer direction finding device and direction finding method |
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|---|---|---|---|---|
| CN116359835A (en) * | 2023-05-15 | 2023-06-30 | 中国人民解放军火箭军工程大学 | Y-type baseline interferometer direction finding device and direction finding method |
| CN116359835B (en) * | 2023-05-15 | 2023-08-15 | 中国人民解放军火箭军工程大学 | Y-type baseline interferometer direction finding device and direction finding method |
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