CN112003640B - Antenna array switching method and system - Google Patents
Antenna array switching method and system Download PDFInfo
- Publication number
- CN112003640B CN112003640B CN202010905567.9A CN202010905567A CN112003640B CN 112003640 B CN112003640 B CN 112003640B CN 202010905567 A CN202010905567 A CN 202010905567A CN 112003640 B CN112003640 B CN 112003640B
- Authority
- CN
- China
- Prior art keywords
- antenna
- frequency offset
- digital signal
- switching
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The present invention relates to the field of antenna arrays, and in particular, to a method and a system for switching an antenna array. The antenna array switching method comprises the following steps: step S1, an antenna array comprises a first antenna and a second antenna group; step S2, receiving switching of analog signals is carried out between the first antenna and the second antenna of the second antenna receiving group; s3, converting the analog signal into a digital signal and outputting the digital signal; s4, eliminating signals received in a switching state from the digital signals; s5, determining carrier frequency offset and correcting the carrier frequency offset; and S6, processing all the digital signals after the frequency offset correction to obtain a positioning result and outputting the positioning result. The beneficial effects of this technical scheme are: the antenna array switching method and the antenna array switching system do not need to be distributed with independent receiving units for each antenna, can reduce the hardware size, reduce the power consumption and the cost, are easy to realize engineering, and can determine the direction of the arrival angle more accurately.
Description
Technical Field
The present invention relates to the field of antenna arrays, and in particular, to a method and a system for switching an antenna array.
Background
When an electromagnetic wave signal propagates, parameters such as the propagation direction and the polarization state of the electromagnetic wave signal are very important characteristic parameters, so that important information of the electromagnetic wave signal can be carried, for example, the propagation direction can describe the spatial position of an electromagnetic wave signal source, the polarization state can describe the vector motion characteristic of the electromagnetic wave signal, and the inherent property of the electromagnetic wave signal is obtained, so that the performance parameters of an antenna array for receiving and transmitting the electromagnetic wave signal are particularly important in the process of propagation and transmission of the electromagnetic wave signal.
Most antenna arrays are susceptible to noise interference, polarization mismatch, and the like, and have poor detection and resolution capabilities, resulting in failure to acquire an accurate signal arrival angle. Thus, the prior art often assigns a separate receiving unit to each antenna in an antenna array to distinguish the received signal from each antenna, and combines the antenna's location distribution in the antenna array with various spectral estimation algorithms to determine the angle of arrival of the signal.
However, since the prior art needs to provide a receiving unit for each antenna, the hardware size and the power consumption integration of the antenna are relatively large, which limits the application of the antenna array in the portable device.
Disclosure of Invention
In order to solve the above problems in the prior art, an antenna array switching method and system are provided.
An antenna array switching method, comprising:
step S1, an antenna array is provided, wherein the antenna array comprises a first antenna and a second antenna group, and the second antenna group comprises a plurality of second antennas;
step S2, receiving switching of analog signals is carried out between the first antenna and the second antenna of the second antenna receiving group, so that the number of times of receiving the analog signals by the first antenna is equal to the number of the second antennas in the second antenna group for receiving the analog signals;
step S3, converting the analog signal into the digital signal and outputting the digital signal;
s4, eliminating signals received in the switching state from the digital signals;
s5, determining carrier frequency offset according to the digital signal received by the first antenna, and performing frequency offset correction on the digital signal received by the second antenna according to the carrier frequency offset;
and S6, processing all the digital signals after the frequency offset correction to obtain a positioning result and outputting the positioning result.
Preferably, the analog signal is a single tone signal of a half period of a positive integer multiple.
Preferably, the step S5 includes:
step S51, a first digital signal received before switching of the first antenna and a second digital signal received after switching are obtained;
step S52, determining carrier frequency offset according to the first digital signal and the second digital signal;
step S53, determining the second antenna receiving an analog signal in the second antenna group corresponding to the switching of the first antenna, and obtaining the corresponding digital signal;
and step S54, carrying out frequency offset correction on the digital signal according to the carrier frequency offset.
Preferably, the carrier frequency offset is expressed as the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,
delta epsilon is used for representing the carrier frequency offset;
r (m) is used to represent the first digital signal;
r (m+2nt) is used to represent the second digital signal;
m is used to represent the number of sampling points of the first digital signal, and m+2nt is used to represent the number of sampling points of the second digital signal.
Preferably, the step S6 includes:
step S61, according to the antenna array, acquiring a steering vector of the antenna array and a noise characteristic vector related to noise;
step S62, obtaining a noise subspace corresponding to the noise feature vector;
step S63, acquiring Euclidean distance of each arrival angle according to the noise subspace;
and S64, acquiring a spectral peak of the arrival angle space spectrum according to the Euclidean distance, and outputting the spectral peak as the positioning result.
Preferably, the angle of arrival spatial spectrum is expressed as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,
p (θ) is used to represent the angle of arrival spatial spectrum, θ is used to represent the angle of arrival;
d is used to represent the euclidean distance;
a (θ) is used to represent the steering vector;
e is used to represent the noise subspace.
An antenna array switching system, comprising:
an antenna array comprising a first antenna and a second antenna group, wherein the second antenna group comprises a plurality of second antennas, and the first antenna and all the second antennas are used for receiving analog signals;
the channel switching module is connected with the antenna array and used for controlling the receiving switching of the analog signals between the first antenna and the second antenna of the second antenna receiving group so that the number of times of receiving the analog signals by the first antenna is equal to the number of the second antennas in the second antenna group for receiving the analog signals;
the analog-to-digital conversion module is connected with the channel switching module and used for converting the analog signal into the digital signal and outputting the digital signal;
the screening module is connected with the analog-to-digital conversion module and is used for eliminating signals received in the switching state from the digital signals;
the frequency offset correction module is connected with the screening module and is used for determining carrier frequency offset according to the digital signals received by the first antenna and carrying out frequency offset correction on the digital signals received by the second antenna according to the carrier frequency offset;
and the processing module is connected with the frequency offset correction module and is used for processing all the digital signals after the frequency offset correction to obtain and output a positioning result.
Preferably, the frequency offset correction module includes:
the acquisition unit is used for acquiring the first digital signal received before the switching of the first antenna and the second digital signal received after the switching;
the computing unit is connected with the acquisition unit and used for determining carrier frequency offset according to the first digital signal and the second digital signal;
and the correction unit is connected with the calculation unit and is used for determining the second antenna which receives the analog signal in the second antenna group corresponding to the first antenna when the first antenna is switched, obtaining the corresponding digital signal and carrying out frequency offset correction on the digital signal according to the carrier frequency offset.
Preferably, the processing module includes:
the first processing unit is used for acquiring a steering vector of the antenna array and a noise characteristic vector related to noise according to the antenna array;
the second processing unit is connected with the first processing unit and is used for acquiring a noise subspace corresponding to the noise characteristic vector;
the third processing unit is connected with the second processing unit and is used for acquiring Euclidean distance of each arrival angle according to the noise subspace;
and the fourth processing unit is connected with the third processing unit and is used for acquiring a spectrum peak of the arrival angle space spectrum according to the Euclidean distance and outputting the spectrum peak as the positioning result.
The technical scheme has the following advantages or beneficial effects: the antenna array switching method and the antenna array switching system do not need to be distributed with independent receiving units for each antenna, can reduce the hardware size, reduce the power consumption and the cost, are easy to realize engineering, and can determine the direction of the arrival angle more accurately.
Drawings
Fig. 1 is a flow chart of an antenna array switching method according to a preferred embodiment of the present invention;
fig. 2 is a schematic flow chart of step S5 in the antenna array switching method according to the preferred embodiment of the present invention;
fig. 3 is a schematic flow chart of step S5 in the antenna array switching method according to the preferred embodiment of the present invention;
fig. 4 is a schematic structural view of an antenna array according to a preferred embodiment of the present invention;
fig. 5 is a schematic structural diagram of an antenna array switching system according to a preferred embodiment of the present invention;
fig. 6 is a schematic structural diagram of a frequency offset correction module according to a preferred embodiment of the present invention;
FIG. 7 is a schematic view showing the structure of a process module in a preferred embodiment of the present invention;
FIG. 8 is a schematic diagram of spectral peaks of an arrival angle spatial spectrum with frequency offset correction in accordance with a preferred embodiment of the present invention;
fig. 9 is a schematic diagram of spectral peaks of an arrival angle spatial spectrum without frequency offset correction in a preferred embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but 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 be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
An antenna array switching method, as shown in fig. 1, includes:
step S1, an antenna array is provided, wherein the antenna array comprises a first antenna and a second antenna group, and the second antenna group comprises a plurality of second antennas;
step S2, receiving switching of analog signals is carried out between the first antenna and the second antenna of the second antenna receiving group, so that the number of times of receiving analog signals by the first antenna is equal to the number of second antennas for receiving analog signals in the second antenna group;
s3, converting the analog signal into a digital signal and outputting the digital signal;
s4, eliminating signals received in a switching state from the digital signals;
s5, determining carrier frequency offset according to the digital signals received by the first antenna, and carrying out frequency offset correction on the digital signals received by the second antenna according to the carrier frequency offset;
and S6, processing all the digital signals after the frequency offset correction to obtain a positioning result and outputting the positioning result.
Specifically, the antenna array switching method is provided, through the receiving switching between the first antenna and the second antenna receiving group, an independent receiving unit is not required to be allocated to each antenna, the hardware size can be reduced, the power consumption and the cost are reduced, and the engineering implementation is easy; and the direction of the arrival angle can be more accurately determined by carrying out frequency offset correction according to the carrier frequency offset.
In step S1, an antenna array with K antennas is provided, the antennas in the antenna array are divided, the first antenna is used as the first antenna, the corresponding serial number is 1, the remaining antennas are used as the second antennas in the second antenna group, and the corresponding serial numbers are 2,3, and 4 … K respectively.
In a preferred embodiment, step S2 of performing the reception switching of the analog signal between the first antenna and the second antenna of the second antenna receiving group may specifically be:
step S21, a receiving switch of the first antenna is turned on, so that the first antenna receives analog signals and performs synchronous matching of the signals;
step S22, when the synchronous matching is carried out to the required signals, the switch is switched, the receiving switch of the first antenna is closed, and meanwhile, the receiving switch of the second antenna with the sequence number of i in the second antenna group is opened, so that the second antenna with the sequence number of i receives the analog signals and carries out synchronous matching of the signals;
step S23, when the synchronous matching is carried out to the required signal, the switch is switched, the receiving switch of the second antenna with the serial number of i in the second antenna group is closed, and the receiving switch of the first antenna is opened at the same time, so that the first antenna receives the analog signal and carries out synchronous matching of the signal, i is increased to be i+1, and then the step S22 is returned;
until all the second antennas in the second antenna group receive the analog signal, then the process is exited.
In the above embodiment, the initial value of i is 2, the maximum value of i is K-1, and the corresponding receiving order is: a first antenna with a number of 1, a second antenna with a number of 2, a first antenna with a number of 1, a second antenna with a number of 3, a first antenna with a number of 1, a second antenna with a number of 4, a first antenna with a number of … …, a second antenna with a number of 1, and a second antenna with a number of K.
In a preferred embodiment, the analog signal is a single tone signal of a positive integer multiple of half cycles.
Specifically, the transmitting end transmits a single-tone signal with a synchronization head, and the receiving duration of each antenna in the antenna array is T, where T is the time for completely receiving the single-tone signal with a half period of a positive integer multiple, where the positive integer may be denoted as T.
In a preferred embodiment, in step S3, analog-to-digital conversion may be performed, and the analog signal may be converted into a digital signal and output.
In a preferred embodiment, considering that the antenna affects the quality of the received signal during the switching operation, in step S4, the signal received in the switching state in the digital signal is removed to obtain a better quality received signal.
In a preferred embodiment, as shown in fig. 2, step S5 includes:
step S51, a first digital signal received before switching of a first antenna and a second digital signal received after switching are obtained;
step S52, determining carrier frequency offset according to the first digital signal and the second digital signal;
step S53, determining a second antenna which receives analog signals in a corresponding second antenna group when the first antenna is switched, and acquiring corresponding digital signals;
step S54, frequency offset correction is carried out on the digital signals according to the carrier frequency offset.
Specifically, since each antenna receives a single tone signal of a positive integer multiple half period entirely, the signals received by the first antenna should be identical in two times. The phase difference of the same part is caused by the existence of carrier frequency synchronization error.
Therefore, in step S51, the first digital signal received before the first antenna switching is acquired:
r(m)＝s(m)*e jmΔε (1)
and a second digital signal received after the switching:
r(m+2Nt)＝s(m+2Nt)*e j(m+2Nt)Δε (2)
subsequently, in step S52, a carrier frequency offset is determined according to the first digital signal and the second digital signal, where the second digital signal may be divided by the first digital signal to obtain:
since the first antenna receives the single-tone signal of the positive integer multiple half-period completely twice in succession, s (m+2nt) =s (m), the above formula (3) can be simplified as:
Q(m)＝e j(2Nt)Δε (4)
thus, the carrier frequency offset is expressed as obtained using the following equation (5):
wherein, the liquid crystal display device comprises a liquid crystal display device,
delta epsilon is used to represent carrier frequency offset;
r (m) is used to represent the first digital signal;
r (m+2nt) is used to represent the second digital signal;
m is used to represent the number of samples of the first digital signal and m+2nt is used for the number of samples of the second digital signal.
Subsequently, in step S53, the frequency offset correction is performed on the received signals of the switched antennas between the first antennas by using the calculated frequency offset, specifically, when the receiving order is: the first antenna with the sequence number of 1, the second antenna with the sequence number of 2 and the first antenna with the sequence number of 1 can carry out frequency offset correction on signals received by the second antenna with the sequence number of 2 according to the calculated frequency offset.
In a preferred embodiment, as shown in fig. 3, step S6 includes:
step S61, according to the antenna array, acquiring a guide vector of the antenna array and a noise characteristic vector related to noise;
step S62, obtaining a noise subspace corresponding to the noise feature vector;
step S63, acquiring Euclidean distance of each arrival angle according to the noise subspace;
and S64, acquiring a spectrum peak of the arrival angle space spectrum according to the Euclidean distance, and outputting the spectrum peak as a positioning result.
In step S61, the antenna distribution is shown in fig. 4, and a steering vector of the antenna array and a noise feature vector related to noise are obtained according to the antenna array; specifically, when the number of signals is D, the number of signal eigenvalues and eigenvectors is correspondingly D, and the number of noise eigenvalues and eigenvectors is K-D, where K is the total number of antennas in the antenna array. If the noise in each channel is uncorrelated, the noise correlation matrix is a diagonal matrix, and uncorrelated noise has equal variance, i.e.:
wherein R is xx R is an antenna array correlation matrix SS In the form of a source correlation matrix,
is a noise correlation matrix, a= [ a (θ 1 ) a(θ 2 ) … a(θ D )]Represents a matrix of steering vectors, I represents an identity matrix, < >>
Representing the noise variance.
Subsequently, in step S62, a noise subspace corresponding to the noise feature vector is obtained; specifically, R is first found xx To find D eigenvectors related to the signal and K-D related to the noiseAnd feature vectors. The feature vector corresponding to the smallest feature value may be selected. For uncorrelated signals, the minimum eigenvalue is equal to the variance of the noise. Then a subspace is constructed of noise eigenvectors, namely:
E＝[e 1 e 2 …e K-D ] (7)
at angle of arrival theta 1 θ 2 …θ D The noise subspace feature vector is orthogonal to the antenna array steering vector.
Because of this orthogonal relationship, the respective arrival angles θ can be found in step S63 1 θ 2 …θ D Euclidean distance d of (2) 2 ＝|a(θ) H EE H a (θ) |. The distance expression is used as a denominator to obtain the peak of the arrival angle.
Thus, the resulting spatial spectrum of angles of arrival can be expressed as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,
p (θ) is used to represent the angle of arrival spatial spectrum, θ is used to represent the angle of arrival;
d is used to represent Euclidean distance;
a (θ) is used to represent a steering vector;
e is used to represent the noise subspace.
Finally, in step S64, according to the acquired spectrum peak of the angle-of-arrival spatial spectrum, the spectrum peak is output as a positioning result.
An antenna array switching system, as shown in fig. 5, includes:
an antenna array A1, including a first antenna 1 and a second antenna group a10, where the second antenna group a10 includes a plurality of second antennas 2,3,4, … K, and the first antenna 1 and all the second antennas are used for receiving analog signals;
a channel switching module A2, connected to the antenna array A1, for controlling the reception switching of analog signals between the first antenna 1 and the second antennas 2,3,4, … K of the second antenna receiving group, so that the number of times the first antenna 1 receives analog signals is equal to the number of second antennas 2,3,4, … K of the second antenna receiving group a 10;
the analog-to-digital conversion module A3 is connected with the channel switching module A2 and is used for converting an analog signal into a digital signal and outputting the digital signal;
the screening module A4 is connected with the analog-to-digital conversion module A3 and is used for eliminating signals received in the switching state from the digital signals;
the frequency offset correction module A5 is connected with the screening module A4 and is used for determining carrier frequency offset according to the digital signals received by the first antenna 1 and carrying out frequency offset correction on the digital signals received by the second antennas 2,3 and 4 … K according to the carrier frequency offset;
and the processing module A6 is connected with the frequency offset correction module A5 and is used for processing all the digital signals after the frequency offset correction to obtain and output a positioning result.
Specifically, an antenna array switching system is provided, where a channel switching module A2 performs reception switching between a first antenna 1 and a second antenna receiving group, and an independent receiving unit is not required to be allocated to each antenna 1,2,3,4 and … K, so that the hardware size can be reduced, the power consumption and the cost can be reduced, and the engineering implementation is easy; the frequency offset correction module A5 carries out frequency offset correction according to carrier frequency offset, and the processing module A6 processes signals after the frequency offset correction, so that the direction of an arrival angle can be more accurately determined.
Specifically, the receiving switch a11 of the first antenna 1 is turned on, so that the first antenna 1 receives the analog signal and performs synchronous matching of the signal; when the synchronous matching is carried out on the required signals, the switch is switched, the receiving switch A11 of the first antenna 1 is closed, and the receiving switch A12 of the second antenna with the serial number of 2 in the second antenna group is opened, so that the second antenna with the serial number of 2 receives analog signals and carries out synchronous matching on the signals; when the synchronous matching is carried out on the required signals, the switch is switched, the receiving switch A12 of the second antenna with the sequence number of 2 in the second antenna group is closed, the receiving switch A11 of the first antenna is simultaneously opened, the first antenna receives analog signals and carries out synchronous matching on the signals, when the synchronous matching is carried out on the required signals, the switch is switched, the receiving switch A11 of the first antenna 1 is closed, the receiving switch A13 of the second antenna with the sequence number of 3 in the second antenna group is simultaneously opened, and the second antenna with the sequence number of 3 receives the analog signals and carries out synchronous matching on the signals; and sequentially cycling until a receiving switch A1K of the second antenna with the serial number K in the second antenna group is turned on, so that all the second antennas receive analog signals.
In a preferred embodiment, as shown in fig. 6, the frequency offset correction module A5 includes:
an acquisition unit a51, configured to acquire a first digital signal received before switching of the first antenna 1 and a second digital signal received after switching;
a calculating unit a52, connected to the obtaining unit a51, for determining a carrier frequency offset according to the first digital signal and the second digital signal;
and a correction unit A53, connected to the calculation unit A52, for determining a second antenna in the second antenna group A10 corresponding to the first antenna 1 when switching, obtaining a corresponding digital signal, and performing frequency offset correction on the digital signal according to the carrier frequency offset.
In a preferred embodiment, as shown in fig. 7, the processing module A6 includes:
a first processing unit a61, configured to obtain, according to the antenna array A1, a steering vector of the antenna array A1 and a noise feature vector related to noise;
the second processing unit A62 is connected with the first processing unit A61 and is used for acquiring a noise subspace corresponding to the noise feature vector;
the third processing unit A63 is connected with the second processing unit A62 and is used for acquiring Euclidean distance of each arrival angle according to the noise subspace;
and the fourth processing unit A64 is connected with the third processing unit A63 and is used for acquiring the spectrum peak of the arrival angle space spectrum according to the Euclidean distance and outputting the spectrum peak as a positioning result.
Examples:
in a preferred embodiment, after a preset transmitting end transmits a signal at a preset angle, the technical scheme is used for switching, frequency offset correction and arrival angle spatial spectrum calculation, so that a spectrum peak search diagram of the arrival angle spatial spectrum shown in fig. 8 can be obtained, the abscissa is the arrival angle, the ordinate is the normalized spatial spectrum, when the arrival angle is 20 degrees, the spectrum peak of the arrival angle spatial spectrum takes the maximum value, the azimuth angle of the electromagnetic wave signal can be determined to be 20 degrees, the 20 degrees are output as a positioning result, and the positioning result is matched with a preset condition, so that the application can accurately determine the spatial position of the electromagnetic wave, and the positioning effect is realized.
Correspondingly, if the frequency offset correction is not performed, the obtained spatial spectrum is shown in fig. 9, the abscissa is the angle of arrival, the ordinate is the normalized spatial spectrum, the spectrum peak is analyzed to obtain the angle of arrival of the electromagnetic wave signal of 39 degrees, the difference from the preset condition is large, and compared with fig. 8 and 9, the direction of the angle of arrival can be accurately determined.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included in the scope of the present invention.
Claims (3)
1. An antenna array switching method, comprising:
step S1, an antenna array is provided, wherein the antenna array comprises a first antenna and a second antenna group, and the second antenna group comprises a plurality of second antennas;
step S2, receiving switching of analog signals is carried out between the first antenna and the second antenna of the second antenna receiving group, so that the number of times of receiving the analog signals by the first antenna is equal to the number of the second antennas in the second antenna group for receiving the analog signals;
s3, converting the analog signal into a digital signal and outputting the digital signal;
s4, eliminating signals received in the switching state from the digital signals;
s5, determining carrier frequency offset according to the digital signal received by the first antenna, and performing frequency offset correction on the digital signal received by the second antenna according to the carrier frequency offset;
s6, processing all the digital signals after the frequency offset correction to obtain a positioning result and outputting the positioning result;
the step S5 includes:
step S51, a first digital signal received before switching of the first antenna and a second digital signal received after switching are obtained;
step S52, determining carrier frequency offset according to the first digital signal and the second digital signal;
step S53, determining the second antenna receiving an analog signal in the second antenna group corresponding to the switching of the first antenna, and obtaining the corresponding digital signal;
step S54, carrying out frequency offset correction on the digital signal according to the carrier frequency offset;
the carrier frequency offset is expressed as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,
delta epsilon is used for representing the carrier frequency offset;
r (m) is used to represent the first digital signal;
r (m+2nt) is used to represent the second digital signal;
m is used for representing the sampling point number of the first digital signal, and m+2Nt is used for representing the sampling point number of the second digital signal;
the step S6 includes:
step S61, according to the antenna array, acquiring a steering vector of the antenna array and a noise characteristic vector related to noise;
step S62, obtaining a noise subspace corresponding to the noise feature vector;
step S63, acquiring Euclidean distance of each arrival angle according to the noise subspace;
step S64, obtaining a spectrum peak of an arrival angle space spectrum according to the Euclidean distance, and outputting the spectrum peak as the positioning result;
the angle of arrival spatial spectrum is expressed as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,
p (θ) is used to represent the angle of arrival spatial spectrum, θ is used to represent the angle of arrival;
d is used to represent the euclidean distance;
a (θ) is used to represent the steering vector;
e is used to represent the noise subspace.
2. The antenna array switching method of claim 1 wherein the analog signal is a single tone signal of a positive integer multiple of half cycles.
3. An antenna array switching system, comprising:
an antenna array comprising a first antenna and a second antenna group, wherein the second antenna group comprises a plurality of second antennas, and the first antenna and all the second antennas are used for receiving analog signals;
the channel switching module is connected with the antenna array and used for controlling the receiving switching of the analog signals between the first antenna and the second antenna of the second antenna receiving group so that the number of times of receiving the analog signals by the first antenna is equal to the number of the second antennas in the second antenna group for receiving the analog signals;
the analog-to-digital conversion module is connected with the channel switching module and used for converting the analog signals into digital signals and outputting the digital signals;
the screening module is connected with the analog-to-digital conversion module and is used for eliminating signals received in the switching state from the digital signals;
the frequency offset correction module is connected with the screening module and is used for determining carrier frequency offset according to the digital signals received by the first antenna and carrying out frequency offset correction on the digital signals received by the second antenna according to the carrier frequency offset;
the processing module is connected with the frequency offset correction module and is used for processing all the digital signals after frequency offset correction to obtain a positioning result and outputting the positioning result;
the frequency offset correction module comprises:
the acquisition unit is used for acquiring the first digital signal received before the switching of the first antenna and the second digital signal received after the switching;
the computing unit is connected with the acquisition unit and used for determining carrier frequency offset according to the first digital signal and the second digital signal;
the correction unit is connected with the calculation unit and is used for determining the second antenna which receives the analog signals in the second antenna group corresponding to the first antenna when the first antenna is switched, obtaining the corresponding digital signals and carrying out frequency offset correction on the digital signals according to the carrier frequency offset;
the carrier frequency offset is expressed as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,
delta epsilon is used for representing the carrier frequency offset;
r (m) is used to represent the first digital signal;
r (m+2nt) is used to represent the second digital signal;
m is used for representing the sampling point number of the first digital signal, and m+2Nt is used for representing the sampling point number of the second digital signal;
the processing module comprises:
the first processing unit is used for acquiring a steering vector of the antenna array and a noise characteristic vector related to noise according to the antenna array;
the second processing unit is connected with the first processing unit and is used for acquiring a noise subspace corresponding to the noise characteristic vector;
the third processing unit is connected with the second processing unit and is used for acquiring Euclidean distance of each arrival angle according to the noise subspace;
the fourth processing unit is connected with the third processing unit and is used for acquiring a spectrum peak of the arrival angle space spectrum according to the Euclidean distance and outputting the spectrum peak as the positioning result;
the angle of arrival spatial spectrum is expressed as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,
p (θ) is used to represent the angle of arrival spatial spectrum, θ is used to represent the angle of arrival;
d is used to represent the euclidean distance;
a (θ) is used to represent the steering vector;
e is used to represent the noise subspace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010905567.9A CN112003640B (en) | 2020-09-01 | 2020-09-01 | Antenna array switching method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010905567.9A CN112003640B (en) | 2020-09-01 | 2020-09-01 | Antenna array switching method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112003640A CN112003640A (en) | 2020-11-27 |
| CN112003640B true CN112003640B (en) | 2023-07-14 |
Family
ID=73465182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010905567.9A Active CN112003640B (en) | 2020-09-01 | 2020-09-01 | Antenna array switching method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112003640B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112702100A (en) * | 2020-12-14 | 2021-04-23 | 上海磐启微电子有限公司 | Automatic following system for luggage |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478770A (en) * | 2009-02-06 | 2009-07-08 | 清华大学 | Multi-antenna measurement signal sending method for solving phase noise problem on the basis of fast switching |
| CN105209927A (en) * | 2013-05-03 | 2015-12-30 | 思科技术公司 | Angle of arrival location sensing with antenna array |
| CN110749859A (en) * | 2019-10-22 | 2020-02-04 | 清华大学 | Single base station array positioning method and device based on multiple carrier frequencies |
| US10700901B1 (en) * | 2019-09-30 | 2020-06-30 | Silicon Laboratories, Inc. | Angle of arrival carrier frequency offset correction |
-
2020
- 2020-09-01 CN CN202010905567.9A patent/CN112003640B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478770A (en) * | 2009-02-06 | 2009-07-08 | 清华大学 | Multi-antenna measurement signal sending method for solving phase noise problem on the basis of fast switching |
| CN105209927A (en) * | 2013-05-03 | 2015-12-30 | 思科技术公司 | Angle of arrival location sensing with antenna array |
| US10700901B1 (en) * | 2019-09-30 | 2020-06-30 | Silicon Laboratories, Inc. | Angle of arrival carrier frequency offset correction |
| CN110749859A (en) * | 2019-10-22 | 2020-02-04 | 清华大学 | Single base station array positioning method and device based on multiple carrier frequencies |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112003640A (en) | 2020-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wen et al. | Angle estimation and mutual coupling self-calibration for ULA-based bistatic MIMO radar | |
| Liao et al. | Iterative methods for subspace and DOA estimation in nonuniform noise | |
| Lemma et al. | Joint angle-frequency estimation using multi-resolution ESPRIT | |
| CN108120967B (en) | Plane array DOA estimation method and equipment | |
| CN112051540B (en) | Quick high-precision direction finding method | |
| KR102183439B1 (en) | Method and apparatus for estimating direction of arrival using combined beamspace music and tma | |
| JPH11271415A (en) | Direction finding device and measurement result processing device therefor | |
| CN112003640B (en) | Antenna array switching method and system | |
| JP2004112508A (en) | Receiver | |
| KR101807499B1 (en) | Apparatus for estimating direction of arrival based on a circularly arraying antenna compensating intermutual interference and method therefor | |
| JP5022943B2 (en) | Direction measuring device | |
| JPH06347529A (en) | Method and device for measuring bearing | |
| CN111698014B (en) | Antenna array system | |
| JPH11281725A (en) | Method and apparatus for measuring multi-path wave parameter and machine readable recording medium recording program | |
| CN111352063A (en) | Two-dimensional direction finding estimation method based on polynomial root finding in uniform area array | |
| JP2006234445A (en) | Arrival direction estimation apparatus | |
| JP2002048853A (en) | Radio wave arrival direction estimator and directivity variable transmitter-receiver | |
| CN112630726B (en) | Arc array positioning method and system | |
| JP4119719B2 (en) | Mobile station direction estimation method and apparatus | |
| Liu et al. | Grade nested array with increased degrees of freedom for quasi-stationary signals | |
| JPH1098326A (en) | Method for reducing bias error of n-port mode former of batler matrix form and its method | |
| Liu et al. | Joint DOA and frequency estimation with spatial and temporal sparse sampling based on two-dimensional covariance matrix expansion | |
| Yang et al. | Nonasymptotic analysis of direct-augmentation ESPRIT for localization of more sources than sensors using sparse arrays | |
| Huang et al. | Sparse representation approaches to parameter estimation of completely polarized wideband signals | |
| Neesen et al. | A novel doppler-based direction-of-arrival estimation scheme |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |