CN115865229A - Broadband phased array channel correction data processing method, device, equipment and medium - Google Patents
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Abstract
The invention discloses a method, a device, equipment and a medium for processing broadband phased array channel correction data, wherein the method comprises the following steps: selecting any one of all broadband phased array channels as a reference channel, and constructing a broadband phased array channel correction phase model; optimizing the correction phase model based on the phase change rate of the broadband phased array to obtain a correction phase model of a zero crossing point; sequentially calculating the optimal delay correction value of each channel, and quantizing and normalizing to obtain a correction table of the broadband phased array channel; and correcting the broadband phased array channel through the correction table. The invention can reduce the phase correction error of the broadband phased array channel in the whole broadband frequency band.
Description
Technical Field
The invention belongs to the technical field of phased array antenna correction, and particularly relates to a method, a device, equipment and a medium for processing broadband phased array channel correction data.
Background
The current broadband phased array adopts a simulated True Time Delay (TTD) system, and realizes the scanning of a beam pattern by compensating the wave path difference between an incident signal and each antenna unit.
As shown in fig. 1, a received signal of each antenna first passes through a low noise amplifier, then passes through a TTD device for delay, and then passes through a combiner for combining, thereby finally forming an analog received beam. And configuring corresponding delay amount for each TTD device through wave control, thereby realizing the scanning of the wave beam.
The correction of the wideband phased array is mainly realized by adjusting the delay amount of each channel. Due to the influences of the matching characteristic of the radio frequency link, the nonlinearity of the device and the like, the delay consistency among the channels is not a constant value along with the frequency, which is expressed in terms of phase, i.e., the phase presents curve change along with the frequency, and fig. 2 is a schematic diagram showing that the phase of the broadband phased array channel presents curve change along with the frequency. In actual correction, the phase difference of each channel at a certain frequency point is usually selected, and then the delay difference is calculated for correction. In order to improve the correction accuracy in the whole frequency band, the method is usually implemented by reducing the frequency point interval, as shown in fig. 3. The correction method has a problem that the phase difference of only a few discrete frequency points is used for calculating the correction value of the whole frequency band, and the correction method is not optimal from the view of the whole frequency band.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a method, a device, equipment and a medium for processing correction data of a broadband phased array channel, adopts an overall optimal data fitting method to generate correction data, and reduces the phase correction error of the broadband phased array channel in the whole broadband frequency band.
The purpose of the invention is realized by the following technical scheme:
a method of wideband phased array channel correction data processing, the method comprising:
selecting any one of all broadband phased array channels as a reference channel, and constructing a broadband phased array channel correction phase model;
optimizing the correction phase model based on the phase change rate of the broadband phased array to obtain a correction phase model of a zero crossing point;
sequentially calculating the optimal delay correction value of each channel, and quantizing and normalizing to obtain a correction table of the broadband phased array channel;
and correcting the broadband phased array channel through the correction table.
Further, selecting any one of all wideband phased array channels as a reference channel, and constructing a wideband phased array channel correction phase model specifically includes:
taking any channel z as a reference channel, and the phase difference between other channels and the channel z is as follows:
wherein, j represents a channel number,
representing the phase correction data of the jth channel, j being a natural number from 1 to N, N being the total number of channels, f m Is discrete frequency points with the unit of Hz, M is a natural number from 1 to M, M is the total number of the discrete frequency points,
are respectively asThe phase of channel j and channel z, in degrees;
structure of the device
Is fitted curve->
As a correction phase, among others,
wherein, a j-0 Is a phase, a j-N Is the rate of change of phase N times.
Further, the optimizing the corrected phase model based on the phase change rate of the wideband phased array to obtain the corrected phase model of the zero crossing point specifically includes:
according to the broadband phased array characteristics, the phase and the phase change rate of more than two orders are removed to obtain the phase with the change rate a only j-1 Zero-crossing point straight line model of (2).
Further, the calculating the optimal delay correction value of each channel specifically includes:
calculating to obtain the optimal delay correction value a of the channel j by adopting a least square method j-1 。
Further, the optimal delay correction value of each channel is sequentially calculated, and quantization and normalization are performed to obtain a correction table of the wideband phased array channel:
traversing and calculating all channels to obtain a correction value set A = [ a ] of all channels 1-1 ,a 2-1 ,a 3-1 ,...a N-1 ]With channel z as the reference channel, a z-1 ＝0；
Searching the minimum value a in the correction value set A min Normalizing a using the following equation:
according to the step amount of the TTD chip, a quantized correction value A = [ a ] is calculated 1 ″ -1 ,a 2 ″ -1 ,...a′ N ′ -1 ]The formula is as follows:
a′ j ′ -1 ＝round[a′ j-1 /a step ]×a step ；
where round is the rounding operation, a step For the delay step size, in seconds, A' is the frequency band [ f 1 ,f M ]The correction table in (2).
In another aspect, the present invention further provides a wideband phased array channel correction data processing apparatus, where the apparatus is configured to implement the foregoing correction data processing method, and the apparatus includes:
the correction phase model building module is used for selecting any one of all broadband phased array channels as a reference channel and constructing a broadband phased array channel correction phase model;
the correction phase model optimization module is used for optimizing the correction phase model based on the phase change rate of the broadband phased array to obtain a correction phase model of a zero crossing point;
the correction table construction module is used for calculating the optimal delay correction value of each channel in sequence, quantizing and normalizing the optimal delay correction value, and obtaining a correction table of the broadband phased array channel;
and the channel correction module is used for correcting the broadband phased array channel through the correction table.
In another aspect, the present invention also provides a computer device, which includes a processor and a memory, where the memory stores a computer program, and the computer program is loaded by the processor and executed to implement any one of the above-mentioned methods for processing wideband phased array channel correction data.
In another aspect, the present invention further provides a computer-readable storage medium, in which a computer program is stored, the computer program being loaded and executed by a processor to implement any one of the above-mentioned methods for processing wideband phased array channel correction data.
The invention has the beneficial effects that:
the invention adopts the new correction data processing direction to form the correction table on the premise of not increasing the number of correction frequency points and changing the correction flow, and can reduce the phase correction error of the broadband phased array channel in the whole broadband frequency band, thereby improving the consistency between the channels.
Drawings
FIG. 1 is a schematic block diagram of a wideband phased array that models true delay;
FIG. 2 is a schematic diagram of the phase of a wideband phased array channel plotted against frequency;
FIG. 3 is a schematic diagram of broadband phased array channel multi-frequency point segmentation correction;
fig. 4 is a schematic flowchart of a method for processing correction data of a wideband phased array channel according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of curve fitting correction according to an embodiment of the present invention;
FIG. 6 is a graph comparing the effect of center frequency point correction and curve fitting correction in the rough segmentation;
FIG. 7 is a comparison graph of the center frequency point correction and curve fitting correction effect under the subdivision;
fig. 8 is a block diagram of a wideband phased array channel correction data processing apparatus according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.
All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Due to the influences of the matching characteristic of the radio frequency link, the nonlinearity of the device and the like, the delay consistency among the channels is not a constant value along with the frequency, which means that the phase presents curve change along with the frequency, and when the actual correction is performed, the phase difference of each channel of a certain frequency point is usually selected, and then the delay difference is calculated to perform the correction. In order to improve the correction accuracy in the whole frequency band, the method is usually implemented by reducing the frequency point interval. The conventional correction method has a problem that the phase difference of only a few discrete frequency points is used for calculating the correction value of the whole frequency band, which is not optimal from the viewpoint of the whole frequency band.
In order to solve the above technical problems, the following embodiments of the wideband phased array channel correction data processing method, apparatus, device and medium of the present invention are proposed.
Example 1
Referring to fig. 1, a schematic block diagram of a wideband phased array simulating true delay is shown in fig. 1, and it can be seen that the wideband phased array includes N antennas, N receive low noise amplifiers, and N TTD retarders. Obtaining phase data of N channels by channel correction
i＝1,2,3,...N，f m M =1,2,3,. M, the larger the M value, i.e., the finer the frequency bin division. The present embodiment provides a phased array channel data correction method for the wideband phased array. />
Referring to fig. 4, as shown in fig. 4, a schematic flow chart of a method for processing correction data of a wideband phased array channel provided in this embodiment is shown, where the method specifically includes the following steps:
selecting channel 1 as reference, the phase difference between the reference channel and other channels is:
wherein j =1,2,3.. N,
the phase of channel j and channel 1, respectively, in degrees.
It should be noted that any channel may be used as the reference channel in this embodiment.
In order to reduce the corrected phase residual in the whole frequency band range, the structure
Is fitted curve->
As a correction phase.
wherein, a j-0 The physical meaning of (A) is phase j-1 The physical meaning of (A) is the rate of change of phase (i.e. delay), a j-2 The physical meaning of (1) is the rate of second-order change of the phase, and so on.
However, according to the characteristics of the wideband phased array, the rate of change of the phase more than two orders is meaningless, so that only the zero order and the first order rate, i.e. a, are considered j-0 And a j-1 。
Because only TTD chips are usually arranged in the broadband phased array, the phase shift cannot be realized, and therefore, the fitted curve only has a j-1 All others are zero, corrected phase after optimization
I.e. a straight line crossing the zero point. Referring to fig. 5, fig. 5 is a schematic diagram of curve fitting correction according to the present embodiment.
Calculating a by using least square rule j-1 The calculation formula is as follows:
at this point, the optimal delay correction value a of the channel j can be calculated j-1 And sequentially calculating the delay correction value of each channel, and quantizing and normalizing the delay correction value to be used as a correction table of each channel of the broadband phased array.
Specifically, the delay correction values of the respective channels are calculated, and quantization and normalization are performed in the following specific manner:
all channels are calculated in a traversal mode, and the obtained channel correction value A = [ a ] 1-1 ,a 2-1 ,a 3-1 ,...a N-1 ]。
Searching the minimum value a in A min Normalizing a using the following formula:
according to the step amount of the TTD chip, a quantized correction value A = [ a ] is calculated 1 ″ -1 ,a 2 ″ -1 ,...a′ N ′ -1 ]The formula is as follows:
a″ j-1 ＝round[a′ j-1 /a step ]×a step ；
where round is the rounding operation, a step For the amount of delay step, in seconds, A' is the frequency band [ f 1 ,f M ]The correction table in (2).
Finally, the phased array channel can be corrected according to the obtained correction table. The specific correction process after obtaining the correction table is not described herein again.
Referring to fig. 6 and 7, a graph showing the comparison between the correction of the center frequency point and the curve fitting correction effect in the rough segment is shown in fig. 6, and a graph showing the comparison between the correction of the center frequency point and the curve fitting correction effect in the fine segment is shown in fig. 7.
Fig. 6 is divided into 2 frequency bands, and fig. 7 is divided into 7 frequency bands. It can be seen from the figure that the correction error of the center frequency point correction method is optimal only at the local frequency point, and the correction error of curve fitting correction is minimal when viewed from the full frequency band.
The method for processing the correction data of the broadband phased array channel provided by the embodiment adopts the correction table formed by the new correction data processing direction on the premise of not increasing the number of correction frequency points and not changing the correction flow, so that the mean square value of phase correction errors of the broadband phased array channel in the whole broadband frequency band can be reduced, and the consistency among the channels is improved.
Example 2
Referring to fig. 8, as shown in fig. 8, a block diagram of a wideband phased array channel correction data processing apparatus provided in this embodiment is shown, and the apparatus specifically includes the following structures:
the correction phase model building module is used for selecting any one of all broadband phased array channels as a reference channel and constructing a broadband phased array channel correction phase model;
the correction phase model optimization module is used for optimizing the correction phase model based on the phase change rate of the broadband phased array to obtain a correction phase model of a zero crossing point;
the correction table construction module is used for calculating the optimal delay correction value of each channel in sequence, quantizing and normalizing the optimal delay correction value, and obtaining a correction table of the broadband phased array channel;
and the channel correction module is used for correcting the broadband phased array channel through the correction table.
The channel broadband phased array channel correction data processing device provided by the embodiment adopts the correction table formed by the new correction data processing direction on the premise of not increasing the number of correction frequency points and not changing the correction flow, so that the phase correction error mean square value of the broadband phased array channel in the whole broadband frequency band can be reduced, and the consistency among channels is improved.
Example 3
The preferred embodiment provides a computer device, which can implement the steps in any embodiment of the method for processing correction data of a wideband phased array channel provided in the embodiment of the present application, and therefore, the beneficial effects of the method for processing correction data of a wideband phased array channel provided in the embodiment of the present application can be achieved, for details, see the foregoing embodiment, and are not described herein again.
Example 4
It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions or by associated hardware controlled by the instructions, which may be stored in a computer readable storage medium and loaded and executed by a processor. To this end, the present invention provides a storage medium, in which a plurality of instructions are stored, and the instructions can be loaded by a processor to execute the steps of any one of the embodiments of the method for processing correction data of wideband phased array channels provided by the embodiments of the present invention.
Wherein the storage medium may include: read Only Memory (ROM), random Access Memory (RAM), magnetic or optical disks, and the like.
Since the instructions stored in the storage medium may execute the steps in any wideband phased array channel correction data processing method embodiment provided by the embodiment of the present invention, beneficial effects that can be achieved by any wideband phased array channel correction data processing method provided by the embodiment of the present invention may be achieved, for details, see the foregoing embodiments, and are not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A method for processing data for correction of a wideband phased array channel, the method comprising:
selecting any one of all broadband phased array channels as a reference channel, and constructing a broadband phased array channel correction phase model;
optimizing the correction phase model based on the phase change rate of the broadband phased array to obtain a correction phase model of a zero crossing point;
sequentially calculating the optimal delay correction value of each channel, and quantizing and normalizing to obtain a correction table of the broadband phased array channel;
and correcting the broadband phased array channel through the correction table.
2. The method for processing the correction data of the wideband phased array channel according to claim 1, wherein the selecting any one of all the wideband phased array channels as a reference channel, and the constructing the wideband phased array channel correction phase model specifically includes:
taking any channel z as a reference channel, and the phase difference between other channels and the channel z is as follows:
wherein j represents a channel number,
representing the phase correction data of the jth channel, j being a natural number from 1 to N, N being the total number of channels, f m Is discrete frequency points with the unit of Hz, M is a natural number from 1 to M, M is the total number of the discrete frequency points,
the phases of channel j and channel z, respectively, are in degrees;
structure of the device
Is fitted curve->
As a correction phase, in which>
Wherein, a j-0 Is a phase, a j-N Is the rate of change of phase N times.
3. The method for processing the correction data of the wideband phased array channel according to claim 2, wherein the optimizing the correction phase model based on the phase change rate of the wideband phased array to obtain the correction phase model of the zero crossing point specifically includes:
according to the broadband phased array characteristics, the phase and the phase change rate more than two times are removed to obtain the phase-change rate containing only the change rate a j-1 The zero-crossing point straight line model of (1).
4. The wideband phased array channel correction data processing method according to claim 3, wherein said calculating an optimal delay correction value for each channel specifically comprises:
calculating to obtain the optimal delay correction value a of the channel j by adopting a least square method j-1 。
5. The method for processing the correction data of the wideband phased array channel according to claim 4, wherein the optimal delay correction values of each channel are calculated in sequence and quantized and normalized to obtain the correction table of the wideband phased array channel:
traversing and calculating all channels to obtain a correction value set A = [ a ] of all channels 1-1 ,a 2-1 ,a 3-1 ,...a N-1 ]With channel z as the reference channel, a z-1 ＝0；
Searching the minimum value a in the correction value set A min Normalizing a using the following formula:
according to the step size of the TTD chip, the quantized correction value A "= [ a") is calculated 1-1 ,a″ 2-1 ,...a″ N-1 ]The formula is as follows:
a″ j-1 ＝round[a′ j-1 /a step ]×a step ；
where round is the rounding operation, a step To prolongThe delay step amount is in seconds, A' is the frequency band [ f 1 ,f M ]The correction table in (2).
6. A broadband phased array channel correction data processing apparatus for implementing the correction data processing method of claim 1, the apparatus comprising:
the correction phase model building module is used for selecting any one of all broadband phased array channels as a reference channel and constructing a broadband phased array channel correction phase model;
the correction phase model optimization module is used for optimizing the correction phase model based on the phase change rate of the broadband phased array to obtain a correction phase model of a zero crossing point;
the correction table construction module is used for calculating the optimal delay correction value of each channel in sequence, quantizing and normalizing the optimal delay correction value, and obtaining a correction table of the broadband phased array channel;
and the channel correction module is used for correcting the broadband phased array channel through the correction table.
7. A computer device comprising a processor and a memory having a computer program stored therein, the computer program being loaded and executed by the processor to implement the wideband phased array channel correction data processing method according to any of claims 1 to 5.
8. A computer-readable storage medium, in which a computer program is stored, which is loaded and executed by a processor to implement the wideband phased array channel correction data processing method according to any of claims 1 to 5.
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