CN117214809B - Single-base-line interferometer non-fuzzy direction finding method and device with turntable - Google Patents
Single-base-line interferometer non-fuzzy direction finding method and device with turntable Download PDFInfo
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Abstract
The invention relates to the technical field of interferometer measurement, and discloses a single-base-line interferometer non-fuzzy direction finding method and device with a turntable, wherein the single-base-line interferometer is additionally provided with the turntable and an auxiliary antenna, and the direction finding method comprises the following steps: adjusting the distance between two antenna array elements of the single-base line interferometer; selecting the beam width of the auxiliary antenna according to the minimum value of the adjacent fuzzy angle difference of the single-base line interferometer and the preset amplitude measurement precision; measuring an incoming wave angle by the single-base line interferometer; the auxiliary antenna detects signal amplitudes corresponding to the plurality of incoming wave angles in the rotating process, and determines the incoming wave angle corresponding to the largest signal amplitude as the real incoming wave direction. Compared with the traditional phase interferometer, the phase interferometer has the advantages of less number of required array elements, simple baseline design, simple angle ambiguity resolution process and higher direction finding precision.
Description
Technical Field
The invention relates to the technical field of interferometer measurement, in particular to a single-base line interferometer non-fuzzy direction finding method and device with a turntable, which relate to the technical field of DOA estimation, radiation source direction measurement and electronic reconnaissance.
Background
The phase interferometer direction finding is a direction finding method which is widely applied, and the method has simple structure and higher direction finding precision. A schematic diagram of phase interferometer direction finding is shown in fig. 1. The distance between two array elements is d, and the electromagnetic wave with the wavelength lambda is incident at the direction angle theta, so that the electromagnetic wave phase difference between the two antennas is as follows:
by measuring phase differences between antennas The direction angle θ can be calculated.
Since the phase difference measurement range is within the interval [ -pi, pi ], when the phase difference between antennas exceeds this interval, phase ambiguity occurs. The actual phase difference and the measured phase difference will differ by an integer multiple of 2 pi. To ensure that the phase difference is not ambiguous, the right value in equation 1 must be within the [ -pi, pi ] interval, i.e., satisfyIf the angular range is-90 DEG to 90 DEG, it is necessary to satisfy/>
The accuracy of interferometer angle measurement also has a relationship with the baseline length d, differentiating equation 1:
combining equation 1 and equation 3, and changing the differential sign to delta, the angular error/accuracy is obtained as:
from equation 4, the larger the baseline length, the smaller the angular error.
In order to solve the contradiction between accuracy and phase difference ambiguity in direction finding, a multi-baseline mode is generally adopted for direction finding. The long base line is used for guaranteeing direction-finding precision, the short base line is low in measuring precision, but the phase is not blurred, and therefore the short base line is used for resolving phase blurring. For example, the existing long and short baseline method is a direction finding method and a virtual baseline method, but the array elements and the baselines of the two methods are still complex in design, and the problems that the baseline ratio influences the ambiguity resolution accuracy and the like exist.
Disclosure of Invention
The technical purpose is that: aiming at the existing phase interferometer direction finding method, the invention provides a phase interferometer direction finding method with a turntable, a turntable and an auxiliary antenna are added on the basis of the phase interferometer, no complex array element design is needed, for the phase interferometer, only two array elements are needed, the auxiliary antenna and the turntable are designed to replace the step of knowing the ambiguity, the invention solves the problems that the baseline design is complex, the baseline ratio influences the ambiguity resolution accuracy in the phase interferometer, and the invention has the advantages of simple structure, easy understanding, high angle finding accuracy and the like.
The technical scheme is as follows: in order to achieve the technical purpose, the invention adopts the following technical scheme:
The single-base-line interferometer with the turntable comprises two antenna array elements, a turntable is arranged on the outer side of the single-base-line interferometer, an auxiliary antenna with beam directivity of an antenna pattern is arranged on the turntable, and the direction finding method comprises the following steps:
s1, determining a baseline length: determining a baseline length d of two antenna elements of the single-baseline interferometer according to equation (14):
lambda max represents the maximum signal wavelength, The phase difference measurement precision is represented, theta max represents the maximum angle measurement, delta theta represents the angle measurement precision, and delta lambda represents the wavelength measurement precision;
adjusting the distance between two antenna array elements of the single-base-line interferometer according to the determined base line length;
S2, determining the beam width of the auxiliary antenna: selecting the beam width of the auxiliary antenna according to the minimum value of the adjacent fuzzy angle difference of the single-base line interferometer and the preset amplitude measurement precision;
S3, single-base line interferometer direction finding: measuring a measured phase difference corresponding to the incoming wave signal by the single-base line interferometer, and calculating a plurality of possible incoming wave angles according to the measured phase difference;
s4, auxiliary antenna disambiguation: the turntable drives the auxiliary antenna to rotate, the auxiliary antenna detects signal amplitudes corresponding to the plurality of incoming wave angles in the rotating process, and the incoming wave angle corresponding to the largest signal amplitude is determined to be the real incoming wave direction.
Preferably, in the step S2, the minimum value of the adjacent blur angle difference is determined by the baseline length of the single-baseline interferometer and the frequency value of the incoming wave signal.
Preferably, in the step S3, when the single-base-line phase interferometer detects a measured phase difference, the base-line phase difference corresponds to a plurality of incoming wave angles, and the incoming wave angle θ is calculated according to equation (16):
in the method, in the process of the invention, Represents a measured phase difference, λ represents a signal wavelength, and m represents a blur number of the measured phase difference;
and eliminating the calculated angles of the plurality of incoming wave angles theta exceeding the angle measurement range [ theta min,θmax ], wherein the angle in the angle measurement range is used as the possible incoming wave direction.
Preferably, the auxiliary antenna is a helical antenna.
A single-base-line interferometer no-ambiguity direction-finding device with a turntable, the single-base-line interferometer comprises two antenna array elements, a turntable is arranged on the outer side of the single-base-line interferometer, and an auxiliary antenna with beam directivity of an antenna pattern is arranged on the turntable, the device comprises:
the interferometer parameter setting module is used for determining the baseline length d of two antenna array elements of the single-baseline interferometer according to the formula (14):
lambda max represents the maximum signal wavelength, The phase difference measurement precision is represented, theta max represents the maximum angle measurement, delta theta represents the angle measurement precision, and delta lambda represents the wavelength measurement precision;
and adjusting the distance between two antenna array elements of the single-base-line interferometer according to the determined base-line length;
the auxiliary antenna parameter setting module is used for selecting the beam width of the auxiliary antenna according to the minimum value of the adjacent fuzzy angle difference of the single-base-line interferometer and the preset amplitude measurement precision;
The single-baseline interferometer direction finding module is used for measuring a measured phase difference corresponding to an incoming wave signal through the single-baseline interferometer and calculating a plurality of possible incoming wave angles according to the measured phase difference;
the turntable driving module is used for driving the turntable to rotate;
The auxiliary antenna deblurring module is used for detecting signal amplitudes corresponding to the plurality of incoming wave angles through the auxiliary antenna in the process that the auxiliary antenna rotates along with the turntable, and determining the incoming wave angle corresponding to the largest signal amplitude as a real incoming wave direction.
The beneficial effects are that: by adopting the technical scheme, compared with the traditional phase interferometer direction finding method, the method has the following advantages:
(1) The number of required array elements is small, only 2 array elements are needed, and at least 3 array elements are needed by the traditional phase interferometer;
(2) The baseline design is simple, a multi-stage baseline is not required to be designed, only the length of the longest baseline is required to be calculated, and the length of each stage of baseline is required to be carefully designed by the traditional phase interferometer;
(3) The angle ambiguity resolution process is simple and easy to understand, the traditional phase interferometer ambiguity resolution process needs a series of calculation processes, the amplitude comparison is only needed, and compared with the traditional amplitude comparison direction finding, under the condition that the beam width is 10 degrees, 9 array elements are needed to cover the 90-degree angle finding range, the interferometer is provided with a turntable, and the signal amplitudes in different directions can be measured in a rotating antenna mode;
(4) The signal amplitude is only used for resolving the angle ambiguity, the angle is not calculated, the angle measurement precision is determined by the angle measurement precision of the phase interferometer, and the direction measurement precision is higher.
Drawings
FIG. 1 is a schematic diagram of a phase interferometer antenna array;
FIG. 2 is a graph of baseline length versus angle of incoming waves;
FIG. 3 is a plot of baseline length versus wavelength;
FIG. 4 is a graph showing the phase difference and the angle of incoming waves;
fig. 5 is a gaussian antenna pattern;
FIG. 6 is a schematic diagram of the true angle discrimination of the helical antenna amplitude;
FIG. 7 is a graph showing the relationship between the measured phase difference and the incoming wave direction;
fig. 8 is a gaussian beam antenna pattern with a beam width of 60 °;
FIG. 9 is a graph of simulation results of angular accuracy;
FIG. 10 is a graph of angular accuracy versus phase difference measurement accuracy;
FIG. 11 is a graph of angular accuracy versus helical antenna beam width;
Fig. 12 is a graph of angular accuracy versus two methods.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
The invention provides a single-base-line interferometer non-ambiguity direction finding method with a turntable, wherein an auxiliary antenna which rotates is additionally arranged in the direction finding of the single-base-line interferometer, the single-base-line interferometer is used for finding a plurality of incoming wave directions (because of ambiguity), then the auxiliary antenna is rotated, the rotation angle is a plurality of incoming wave directions measured by the interferometer, the signal amplitude measured by the auxiliary antenna is compared in the plurality of incoming wave directions, and the incoming wave direction with the largest amplitude is the finally estimated incoming wave direction. The rotated auxiliary antenna only assists in resolving ambiguity to achieve high accuracy direction finding with as few antennas as possible. The specific principle is as follows.
(1) Phase interferometer module
Let the required signal frequency range [ f min,fmax ], the angular range [ - θ, θ ], the angular accuracy Δθ. The phase difference measurement accuracy that can be achieved by the interferometer direction-finding equipment isThe direction finding requires frequency information, and the receiver frequency measuring precision is deltaf.
Based on the above criteria and device performance, in combination with equation 4,
The baseline length needs to satisfy the following relationship:
where λ represents wavelength, Δλ is wavelength measurement error/accuracy, d represents baseline length, and the above equation can be converted into:
And (3) making:
D min is shown in fig. 2 as a function of wavelength and angle.
D min is shown in fig. 3 as a function of wavelength and angle, and it can be seen from fig. 3 that the longer the wavelength, the larger the incoming wave angle, and the longer the baseline length required to achieve the same angular accuracy. Therefore, the design of the baseline length is to satisfy:
After the baseline is designed according to equation 14, the array element layout of the phase interferometer is determined. In the present invention, the phase interferometer requires only two array elements.
When the direction is directly measured by using a long base line, the measured angle is ambiguous because the phase difference can be represented in a range of [ -pi, pi ], and when the phase difference exceeds the range, the phase difference can be unwound back to the interval of [ -pi, pi ], and the unwinding is that the phase difference is returned to the interval of [ -pi, pi ] by adding 2 pi or subtracting 2 pi.
Fig. 4 reflects the change of the phase difference in the range of [ -45 deg., and shows the change law of the actual phase difference and the phase difference after the unwinding (i.e., the baseline phase difference or the measured phase difference), and it can be seen that the relationship between the phase difference and the angle is not monotonous after the unwinding, and the same phase difference corresponds to a plurality of angles, so that the angle value cannot be obtained directly from the phase difference, which requires the spiral antenna to add a turntable to solve the angle ambiguity.
(2) Spiral antenna turntable adding module
In the present invention, the auxiliary antenna may use a helical antenna. The position relation between the two antenna array elements and the auxiliary antenna of the single-base line interferometer is as follows: and placing a structural member on a turntable, wherein three antennas are arranged on the structural member, the three antennas are positioned on the same straight line, the straight line is parallel to the horizontal plane, and the normal directions of the three antennas are consistent and all point to the direction vertical to the horizontal plane. The middle antenna is an auxiliary antenna for measuring amplitude, and the antennas on two sides form two antenna array elements of the single-base line interferometer together.
The position relation between the two antenna array elements and the auxiliary antenna of the single-base line interferometer is as follows: and placing a structural member on a turntable, wherein three antennas are arranged on the structural member, the three antennas are positioned on the same straight line, the straight line is parallel to the horizontal plane, and the normal directions of the three antennas are consistent and all point to the direction vertical to the horizontal plane. The middle antenna is an auxiliary antenna for measuring amplitude, and the antennas on two sides form two antenna array elements of the single-base line interferometer together.
The antenna pattern function of the helical antenna may be represented by a gaussian function, as shown in fig. 5. It can be seen that the gain of the gaussian beam has a very pronounced angular dependence. When the spiral antenna rotates along with the turntable, the amplitude can be maximized when the antenna is aligned with the incoming wave direction.
When the phase interferometer detects a phase difference, the phase difference corresponds to a plurality of incoming wave angles, namely the angles are blurred, and when the spiral antenna rotates to the real arrival angle, the amplitude of the received signal is maximum, so that the real arrival angle can be identified through the amplitude of the received signal of the spiral antenna.
As shown in fig. 6, if the phase difference measured by the interferometer is 2 radians, six possible incoming wave directions are corresponding to the phase difference, and by comparing the magnitudes of the signal amplitudes of the spiral antennas in the six possible incoming wave directions, the actual incoming wave direction can be determined as the angle at which the signal amplitudes of the spiral antennas are maximum, which is called as resolving the angle ambiguity. In fig. 6, the angle of maximum amplitude should be 4.6 °.
The beam width of the spiral antenna is also selected according to practical situations, for example, in the simulation of the invention, the angle difference between two adjacent fuzzy angles is about 15 degrees, the amplitude measurement precision is assumed to be 1dB, if the beam width of the spiral antenna is too wide and the amplitude variation of the signal received by the antenna within the 15-degree range of the beam center is less than 1dB, the two adjacent fuzzy angles cannot be correctly distinguished due to the influence of the amplitude measurement error, so the beam of the antenna should be as small as possible to be convenient for correctly distinguishing the fuzzy angles. The minimum value of the adjacent ambiguity angle difference is determined by the length of the single-base line interferometer and the frequency value of the incoming wave signal. The beam width of the helical antenna is selected based on the minimum value of the adjacent ambiguous angular difference and the amplitude accuracy, which is empirically chosen, and it is generally believed that the beam width of the antenna must be less than the desired angular resolution of 15 °.
In the invention, the antenna pattern function of the spiral antenna can be expressed by cos function and sink function, which are all used for simulating the antenna beam, and the function is not used in actual engineering application, and the actually measured antenna pattern of the antenna is used. And the antenna used in the invention is not limited to a spiral antenna, and other types of antennas can be used, and only the antenna pattern of the antenna has beam directivity.
(3) Direction finding performance
Assuming that the signal frequency is 12GHz, the incoming wave angle range is [ -45 °,45 ° ], the phase difference measurement accuracy (rms) is 10 °, the frequency measurement accuracy/frequency measurement accuracy (rms) is 1MHz, the helical antenna beam width is 10 °, the signal amplitude measurement accuracy/amplitude measurement accuracy (rms) is 1dB, and the intended angle measurement accuracy is 1 °.
From the above information, it can be calculated that the direction-finding accuracy of 1 ° is to be achieved, the baseline length of the phase interferometer is to be greater than 57.6mm, and the baseline length of the phase interferometer is to be 71mm.
The simulation steps of the specific example of the unambiguous direction finding method of the single-base line interferometer comprise:
firstly, simulating a phase difference measured value, wherein a phase difference measurement error is added to the phase difference, and phase difference unwinding is carried out; calculating a possible incoming wave direction according to the measured phase difference; simulation of the rotation of the helical antenna can be obtained by translation of the antenna pattern on an angular scale, and the measurement result of the helical antenna also needs to be added with signal amplitude measurement errors; after the signal amplitude value of the spiral antenna in each possible incoming wave direction is obtained, the direction with the largest amplitude value is the actual incoming wave direction.
The simulation example is as follows:
step 1, determining the base line length
The incoming wave direction maximum is 45 ° assuming a frequency of 12GHz for the signal. The phase difference measurement error was 10 °, and the frequency measurement error was 1MHz. The angular accuracy that is desired is 1. Substituting these indices into the following formula:
Where lambda represents the wavelength of the light, The phase difference measurement error/accuracy is represented, θ represents the incoming wave direction maximum value, and Δθ represents the angular accuracy.
D=56.5 mm is obtained, so the minimum baseline length is 56.5mm. The baseline length was taken to be 57mm.
Step 2, determining the beam width of the helical antenna
And (3) determining the minimum value of the adjacent fuzzy angle difference according to the index in the step (1). The relationship between the phase difference after the unwinding and the angle of the incoming wave is shown in fig. 7.
It can be seen that the same phase difference value corresponds to at most 4 angles. Taking 0 (radian) as an example, the 0 radian phase difference corresponds to 3 angles, the real phase differences of the 3 angles are-2 pi, 0 and 2 pi respectively, the corresponding measured phase difference fuzzy numbers are-1, 0 and 1 respectively, and the measured phase difference is calculated by the following formula:
in the above-mentioned method, the step of, Represents a measured phase difference, λ represents a signal wavelength; d represents the base line length, m represents the number of ambiguities in the measured phase difference, and m is-1, 0 in this calculation. The definition of the other variables is the same as equation 15.
The incoming wave angles corresponding to the three phase differences are respectively-26 degrees, 0 degrees and 26 degrees. From this it is determined that the angle difference between the adjacent two blurring angles is about 26 °. Assuming that the amplitude measurement accuracy of the helical antenna is about 1dB, the beam width is guaranteed to be reduced by 1dB from the center of the beam, and the angle variation is smaller than 26 °. Fig. 8 plots a gaussian beam antenna pattern with a beam width of 60 deg., a 1dB angle drop from the beam center by 17 deg., meeting the requirements.
Step 3, determining the fuzzy angle according to the phase difference
Assuming that the incoming wave direction is 30 °, the corresponding phase difference is 7.16, and the measured phase is 0.97 due to the phase difference error and phase unwrapping. When the phase difference is detected, the actual phase difference can be assumed to be 0.97-4 pi, 0.97-2 pi, 0.97, 0.97+2 pi and 0.97+4 pi, the signal frequency is 12GHz, the corresponding wavelength is 25mm, and the wavelength measurement error is 2 mu m. Substituting formula 16, the possible incoming wave angles can be calculated to be-54.03 deg., 21.75 deg., 3.90 deg., 30.44 deg., 70.95 deg..
Step 4, determining a real arrival angle according to the amplitude measurement result of the spiral antenna
Five incoming wave angles are calculated in the step 3, wherein the first and the last of the incoming wave angles are beyond the angle measuring range of-45 degrees to 45 degrees, so that the amplitudes of the other three angles are not considered, and the corresponding amplitudes are 0.39, 0.95 and 1.04, wherein the maximum amplitude is 1.04, and the corresponding angle is 30.44 degrees. The final measured angle was 30.44 °.
The present invention was simulated 2000 times for each angle and the results are shown in fig. 9. From the simulation results, it can be seen that the angular accuracy reaches the expected 1 °.
In the invention, the signal amplitude is only used for resolving the angle ambiguity and is not used for calculating the angle, so the angle measurement precision is determined by the angle measurement precision of the phase interferometer, for example, when the beam width is 25 degrees in the invention, the angle measurement precision of 0.6 degrees can be achieved, while the traditional amplitude ratio direction measurement is required to achieve the angle measurement precision of 0.6 degrees under the condition that the amplitude measurement error is unchanged, and the beam width is required to be about 10 degrees. I.e. to achieve high accuracy of direction finding with as few antennas as possible.
Further analysis was as follows:
The other conditions are kept unchanged, the phase difference measurement precision is changed, the simulation result of the angle measurement precision is shown in fig. 10, 4 lines in fig. 10 correspond to the angle measurement precision when the phase difference measurement precision is 5 degrees, 10 degrees, 15 degrees and 20 degrees from top to bottom, and it can be seen that the angle measurement precision is poor as the phase difference error becomes larger, but the angle measurement is not blurred.
The simulation results of the angular accuracy are shown in fig. 11, while keeping the above other conditions unchanged, and changing the beam width of the helical antenna. From the simulation results, when the beam width is equal to 30 °, an angle ambiguity occurs, because when the beam width is wider, the amplitude difference between several incoming wave directions is small, and after the influence of the amplitude measurement error is added, the amplitude may be maximum at the non-incoming wave directions, thereby causing an error in the angle measurement result. In practical use, an appropriate antenna beam width needs to be selected according to factors such as amplitude measurement errors.
The conditions are kept unchanged, and the traditional phase interferometer angle measurement is carried out. The three-array element antenna array is designed according to the requirement, the antenna spacing is 29.5mm and 41.5mm respectively, and the length of the longest base line is 71mm, so that the length of the longest base line is the same as that of the long base line used in the method, and the reachable angle measurement precision is also the same. The lengths of the three groups of baselines are respectively 12mm, 29.5mm and 71mm, the baseline ratio also meets the requirement of correct deblurring, and the first group of baselines are virtual baselines. 2000 simulations were performed on the direction-finding result using the conventional direction-finding method, and the simulation result is shown in fig. 12. From the simulation results, it can be seen that the direction-finding accuracy of the two methods is consistent.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the invention in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the invention.
Claims (4)
1. The single-base-line interferometer non-ambiguity direction finding method with a turntable is characterized in that the single-base-line interferometer comprises two antenna array elements, a turntable is arranged on the outer side of the single-base-line interferometer, an auxiliary antenna with beam directivity of an antenna pattern is arranged on the turntable, and the direction finding method comprises the following steps:
S1, determining a baseline length: determining a baseline length d of two antenna elements of the single-baseline interferometer according to equation (14):
lambda max represents the maximum signal wavelength, The phase difference measurement precision is represented, theta max represents the maximum angle measurement, delta theta represents the angle measurement precision, and delta lambda represents the wavelength measurement precision;
adjusting the distance between two antenna array elements of the single-base-line interferometer according to the determined base line length;
S2, determining the beam width of the auxiliary antenna: selecting the beam width of an auxiliary antenna according to the minimum value of the adjacent fuzzy angle difference of the single-base-line interferometer and the preset amplitude measurement precision, wherein the minimum value of the adjacent fuzzy angle difference is determined by the base line length of the single-base-line interferometer and the frequency value of an incoming wave signal, and the auxiliary antenna adopts an antenna with the beam directivity of an antenna pattern;
S3, single-base line interferometer direction finding: measuring a measured phase difference corresponding to the incoming wave signal by the single-base line interferometer, and calculating a plurality of possible incoming wave angles according to the measured phase difference;
s4, auxiliary antenna disambiguation: the turntable drives the auxiliary antenna to rotate, the auxiliary antenna detects signal amplitudes corresponding to the plurality of incoming wave angles in the rotating process, and the incoming wave angle corresponding to the largest signal amplitude is determined to be the real incoming wave direction.
2. The single-base-line interferometer unambiguous direction finding method with a turntable of claim 1, wherein: in the step S3, when the single-base-line phase interferometer detects a measured phase difference, the measured phase difference corresponds to a plurality of incoming wave angles, and the incoming wave angle θ is calculated according to the formula (16):
in the method, in the process of the invention, Represents a measured phase difference, λ represents a signal wavelength, and m represents a blur number of the measured phase difference;
and eliminating the calculated angles of the plurality of incoming wave angles theta exceeding the angle measurement range [ theta min,θmax ], wherein the angle in the angle measurement range is used as the possible incoming wave direction.
3. The single-base-line interferometer unambiguous direction finding method with a turntable of claim 1, wherein: the auxiliary antenna adopts a spiral antenna.
4. The utility model provides a single basic line interferometer of area revolving stage does not have fuzzy direction finding device, its characterized in that, single basic line interferometer includes two antenna array elements the outside of single basic line interferometer sets up a revolving stage, and is equipped with the auxiliary antenna that its antenna pattern has beam directivity on the revolving stage, the device includes:
the interferometer parameter setting module is used for determining the baseline length d of two antenna array elements of the single-baseline interferometer according to the formula (14):
lambda max represents the maximum signal wavelength, The phase difference measurement precision is represented, theta max represents the maximum angle measurement, delta theta represents the angle measurement precision, and delta lambda represents the wavelength measurement precision;
and adjusting the distance between two antenna array elements of the single-base-line interferometer according to the determined base-line length;
the auxiliary antenna parameter setting module is used for selecting the beam width of an auxiliary antenna according to the minimum value of the adjacent fuzzy angle difference of the single-base-line interferometer and the preset amplitude measurement precision, wherein the minimum value of the adjacent fuzzy angle difference is determined by the base line length of the single-base-line interferometer and the frequency value of an incoming wave signal, and the auxiliary antenna adopts an antenna with beam directivity in an antenna pattern;
The single-baseline interferometer direction finding module is used for measuring a measured phase difference corresponding to an incoming wave signal through the single-baseline interferometer and calculating a plurality of possible incoming wave angles according to the measured phase difference;
the turntable driving module is used for driving the turntable to rotate;
The auxiliary antenna deblurring module is used for detecting signal amplitudes corresponding to the plurality of incoming wave angles through the auxiliary antenna in the process that the auxiliary antenna rotates along with the turntable, and determining the incoming wave angle corresponding to the largest signal amplitude as a real incoming wave direction.
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