WO2019127398A1

WO2019127398A1 - Phase alignment method and circuit

Info

Publication number: WO2019127398A1
Application number: PCT/CN2017/119928
Authority: WO
Inventors: 朱成; 时文文; 范明爽
Original assignee: 鹤壁天海电子信息系统有限公司
Priority date: 2017-12-29
Filing date: 2017-12-29
Publication date: 2019-07-04

Abstract

A phase alignment method and circuit. The phase alignment method comprises: acquiring multiple channels to undergo alignment; selecting one of the multiple channels to serve as a reference channel; determining correspondence relationships between phase shift values of respective target channels and output voltages; and performing, according to the correspondence relationships between the phase shift values of the respective target channels and the output voltages, adjustment of the phase shift values of the respective target channels. The method and circuit enable phase alignment to be performed on multiple channels, thereby solving a problem in the prior art in which no phase alignment method for multiple channels is available.

Description

Phase calibration method and circuit

Technical field

The present invention relates to the field of communications, and more particularly to a phase calibration method and circuit.

Background technique

With the development of communication technologies, various antenna technologies have been applied to communication systems to improve the communication performance of communication systems. Among them, the array antenna technology is one of the antenna technologies. The array antenna technology is combined with the beamforming technology, which can significantly improve the coverage, communication capacity and anti-interference ability of the communication system. The array antenna technology refers to a communication system that includes multiple antennas, and all antennas are arranged according to a specific rule. The beamforming technique refers to changing the phase of the input signal of the antenna and synthesizing the signal in space, thereby changing the radiation direction of the antenna.

However, beamforming technology requires no phase difference between channels, but due to the discrete characteristics of RF devices such as amplifiers and filters in each channel, or during the use of RF devices, RF devices are subject to voltage and temperature changes. As well as the influence of aging and other factors, the phase between the channels is often difficult to maintain the phase difference. Therefore, the phase of each channel needs to be calibrated, but there is no method for phase calibration of multiple channels.

Therefore, there is a need for a method of phase calibration for multiple channels.

Summary of the invention

In view of this, the present invention provides a phase calibration method and circuit to solve the problem of a method of phase calibration for multiple channels.

In order to solve the above technical problems, the present invention adopts the following technical solutions:

A phase calibration method comprising:

Obtain multiple channels to be calibrated;

Selecting one of the plurality of channels as a reference channel;

Determining a correspondence between a phase shift phase value of each target channel and an output voltage; wherein the target channel is any one of the plurality of the channels except the reference channel;

The phase shift value of each target channel is adjusted according to the corresponding relationship between the phase shift phase value of each target channel and the output voltage.

Preferably, the determining the correspondence between the phase shift phase value of each target channel and the output voltage comprises:

Selecting one of the plurality of channels as a target channel; wherein the target channel is different from the reference channel;

Input the same test power signal for the reference channel and the target channel respectively;

And phase-shifting the phase of the test power signal output by the target channel by N degrees;

Performing power synthesis on the phase-shifted test power signal and the test power signal outputted by the reference channel to obtain an Mth composite signal;

Converting the Mth composite signal into a voltage signal;

Changing the phase shift phase value N of the test power signal outputted by the target channel to obtain a new composite signal and a voltage signal until 360 degree phase shift is completed, thereby obtaining a correspondence between the phase shift phase values of the target channels and the output voltage Relationship; where M is a positive integer; N is a positive number;

Determining whether a corresponding relationship between a phase shift phase value and an output voltage of any one of the plurality of channels other than the reference channel is obtained;

If it is determined that the phase shift phase value of any one of the plurality of channels other than the reference channel and the output voltage are not obtained, returning one channel from the plurality of channels as the target channel And stopping until a corresponding relationship between the phase shift phase values of any one of the plurality of channels except the reference channel and the output voltage is obtained.

Preferably, the phase shift phase value N of the test power signal outputted by the target channel is changed to obtain a new composite signal and a voltage signal until 360 degree phase shift is completed, thereby obtaining phase shift phase values and outputs of the target channels. Correspondence of voltage, including:

Let N = (M-1) × P; where P is a predetermined value less than 360;

Determine whether N is greater than 360;

If it is determined that N is not greater than 360, M=M+1, and returning the phase shift phase N of the test power signal outputted by the target channel to obtain an output voltage corresponding to the Mth composite signal until N is greater than 360. Thereby, the corresponding relationship between the phase shift phase values of the target channel and the output voltage is obtained.

Preferably, the adjusting the phase shift value of each target channel according to the corresponding relationship between the phase shift phase value of each target channel and the output voltage comprises:

For each target channel, the phase shift phase value corresponding to the minimum voltage value is determined from the corresponding relationship between the phase shift phase value of the target channel and the output voltage;

The phase difference between each target channel and the reference channel is obtained according to the determined phase shift phase value to perform phase calibration on the target channel.

Preferably, the phase difference between each target channel and the reference channel is obtained according to the determined phase shift phase value, so as to perform phase calibration on the target channel, including:

If the phase shift phase value is between 0 and 180 degrees, set the phase difference between the target channel and the reference channel to be 180 degrees from the phase shift phase value, and set the difference between the phase of the target channel and the reference channel as the calculation. The resulting phase difference;

If the phase shift phase value is between 180 and 360 degrees, the phase difference between the target channel and the reference channel is set to a difference between 180 degrees and the phase shift phase value or a difference between 540 degrees and the phase shift phase value, and Set the difference between the phase of the target channel and the reference channel to the calculated phase difference.

Preferably, the phase-compared test power signal and the test power signal outputted by the reference channel are subjected to power synthesis to obtain an Mth composite signal, including:

The vector summation algorithm is used to synthesize the test power signal outputted by the reference channel and the phase-shifted test power signal to obtain an Mth composite signal.

Preferably, converting the Mth composite signal into a voltage signal comprises:

Converting the Mth composite signal into a voltage signal to obtain an output voltage corresponding to the Mth composite signal.

A phase calibration circuit comprising:

a signal source, a plurality of channels, a plurality of phase shifters, a detecting device, and a processor; wherein the signal sources are respectively connected to each of the channels, and each of the channels is respectively connected to one of the phase shifters, each The phase shifters are respectively connected to the processor and the detecting device, and the detecting device is connected to the processor; the phase shifters connected to each of the channels are different, and one channel is used as a reference channel, except All of the channels other than the reference channel are sequentially used as target channels;

Wherein the signal source is used to generate a test power signal;

Each of the channels is configured to transmit the test power signal;

a phase shifter connected to each of the target channels, configured to receive a phase shift instruction sent by the processor multiple times, and adjust a phase of a corresponding test power signal output by the target channel, and receive the processor to send The phase adjustment command adjusts the phase shift phase;

The detecting device is configured to receive and output a plurality of phase-shifted test power signals outputted from the phase shifter connected to each of the target channels, and a plurality of test power signals output by the phase shifter connected to the reference channel Generating a corresponding relationship between a phase shift phase value of each phase shifter connected to the target channel and an output voltage;

The processor is configured to generate a phase shifting instruction of each phase channel connected phase shifter, and send it to a corresponding phase shifter, and a phase shift phase value of the phase shifter connected according to each of the target channels Corresponding to the output voltage, a phase adjustment command is generated and sent to the corresponding phase shifter.

Preferably, the signal source comprises:

a signal generating device, a distributor, and a plurality of switches;

The signal generating device is connected to the dispenser, the dispenser is respectively connected to each of the switches, and each of the switches is respectively connected to one of the channels; wherein each channel of each of the switches is different ;

The signal generating device is configured to generate a total power test signal;

The distributor is configured to divide the total power test signal into a plurality of the same power test signals that are the same as the number of the switches;

The switch is configured to select whether each of the channels inputs the power test signal.

Preferably, each of the channels further comprises:

a coupler, a filter, an amplifier, and a limiting device; the coupler, the filter, the limiting device, and the amplifier are sequentially connected;

The coupler is configured to receive the power test signal;

The filter is configured to perform a filtering operation on the power test signal;

The limiting device is configured to perform a limiting operation on the filtered signal;

The amplifier is configured to perform an amplification operation on the clipped signal to obtain a test power signal that is finally outputted by the channel.

Preferably, the detecting device comprises:

a synthesizer and a detector; the synthesizer is coupled to the detector;

a synthesizer, configured to receive and output a plurality of test power signals output by the phase shifter connected to the reference channel, and a plurality of phase shift outputs of the phase shifter connected to each of the target channels The test power signal is subjected to power synthesis to obtain a plurality of composite signals;

The detector is configured to receive and according to the plurality of the composite signals, obtain a correspondence between a phase shift phase value and an output voltage of the phase shifter connected to each of the target channels.

Preferably, the processor is configured to: when generating a phase adjustment instruction according to a corresponding relationship between a phase shift phase value of the phase shifter connected to each of the target channels and an output voltage, specifically:

A phase difference between each target channel and the reference channel is obtained according to the determined phase shift phase value, and a phase adjustment command is generated to perform phase calibration on the target channel.

Preferably, the processor is configured to obtain a phase difference between each target channel and the reference channel according to the determined phase shift phase value, and generate a phase adjustment instruction, so as to perform phase calibration on the target channel, specifically:

If the phase shift phase value is between 0 and 180 degrees, the phase difference between the target channel and the reference channel is set to be the difference between the phase and the phase shift phase value, and the first phase adjustment command is generated and sent to the target channel; The first phase adjustment command is configured to set a difference between phases of the target channel and the reference channel to the calculated phase difference;

If the phase shift phase value is between 180 and 360 degrees, the phase difference between the target channel and the reference channel is set to a difference between 180 degrees and the phase shift phase value or a difference between the 540 degrees and the phase shift phase value is generated. And sending a second phase adjustment command to the target channel;

The second phase adjustment command is configured to set a difference between phases of the target channel and the reference channel to the calculated phase difference.

Compared with the prior art, the present invention has the following beneficial effects:

The invention provides a phase calibration method and circuit, which acquires a plurality of channels to be calibrated, selects one of the plurality of channels as a reference channel, and determines a phase shift phase value and an output voltage of each target channel. The corresponding relationship is adjusted according to the corresponding relationship between the phase shift phase value of each target channel and the output voltage, and the phase shift value of each target channel. The invention can perform phase calibration on multiple channels, and solves the problem that there is no method for phase calibration of multiple channels at present.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a flow chart of a method for calibrating an electrical method of a phase provided by the present invention;

2 is a circuit structural diagram of a phase calibration circuit provided by the present invention;

3 is a flow chart of a method for calibrating an electrical method of another phase provided by the present invention;

Figure 4 is a graph showing the relationship between phase difference and slope;

Figure 5 is a relationship diagram between output amplitude and phase difference;

6 is a flow chart of a method for calibrating an electrical method of another phase provided by the present invention;

FIG. 7 is a circuit structural diagram of another phase calibration circuit provided by the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the present invention provides a phase calibration method. Referring to FIG. 1, the method may include:

S11. Acquire multiple channels to be calibrated;

Among them, since electromagnetic interference or the like is encountered in the channel, when a plurality of channels input the same signal, the signals outputted by each channel may be different. In turn, the phase of the channel needs to be adjusted.

Specifically, referring to FIG. 2, in FIG. 2, the signal source 101 generates a plurality of test power signals, and inputs each test power signal into a corresponding channel. The channel is used to transmit test power signals. The channel can be 201-20n.

S12. Select one of the plurality of channels as the reference channel.

Wherein, one reference channel can be randomly selected, and each channel except the reference channel can be referred to as a target channel in turn.

S13. Determine a correspondence between a phase shift phase value of each target channel and an output voltage;

The target channel is any one of the plurality of channels except the reference channel.

Specifically, a phase shifter such as a phase shifter 301-30n is connected after each target channel. The channel 201 is connected to the phase shifter 301, and the channel 202 is connected to the phase shifter 302 until the channel 20n is connected to the phase shifter 30m.

The corresponding relationship between the phase shift phase value and the output voltage is the corresponding relationship between the phase shift phase value of the phase shifter and the output voltage.

S14. Adjust a phase shift value of each target channel according to a correspondence between a phase shift phase value of each target channel and an output voltage.

The invention can perform phase calibration on multiple channels, and solves the problem that there is no method for phase calibration of multiple channels at present.

Optionally, based on the embodiment of the phase calibration method, referring to FIG. 3, step S23 may include:

S21. Select one of the plurality of channels as the target channel.

Wherein the target channel is different from the reference channel.

Specifically, the channels other than the reference channel may be sorted, and after the sorting is completed, the channel with the smallest serial number is selected as the target channel.

In addition, the target channel can also be selected by random selection.

S22. Input the same test power signal for the reference channel and the target channel respectively.

The test power signal is the signal generated by the signal source 101.

S23. The phase of the test power signal output by the target channel is phase-shifted by N degrees;

N can be 5.625, or it can be other values. The value of N is set by the technician according to the specific usage scenario. When N is 5.625, it is the minimum step of the phase shifter.

The phase shift phase N of the test power signal outputted by the target channel is controlled by a phase shifter connected to the target channel, and the phase shifter will phase-shift the phase of the test power signal by N degrees. Among them, the phase shifter (Phaser) is a device capable of adjusting the phase of the wave.

S24, performing power synthesis on the phase-shifted test power signal and the test power signal output by the reference channel to obtain an Mth composite signal;

Optionally, on the basis of this embodiment, step S24 may include:

Among them, the power synthesis is performed by a synthesizer in the detecting device.

Specifically, the synthesizer performs signal synthesis according to the formula

Wherein, P ₁ and P ₂ are the power of the test power signal output by the reference channel and the power of the test power signal after the phase shift of the target channel output, and θ ₁ and θ ₂ are the absolute phase of the power of the reference channel and the power of the target channel. The absolute phase, P ₀ is the combined power.

According to the above formula, it is found that when θ _{1 -} θ ₂ is ± π, the combined power is the smallest.

Referring to Figure 4, Figure 4 is a plot of phase difference versus slope. The horizontal axis is the phase difference and the vertical axis is the slope. As can be seen from Figure 4, when the phase difference approaches 180 degrees, the slope is much larger than the other. The slope corresponding to the phase difference indicates that the phase calibration is most accurate when the phase difference between the signal output from the reference channel and the target channel is 180 degrees.

In addition, referring to FIG. 5, FIG. 5 is a relationship diagram between the output amplitude and the phase difference, the horizontal axis is the phase difference, and the vertical axis is the amplitude. As can be seen from FIG. 5, even if the amplitude of the signal output by the calibration device of the entire phase is Unbalanced, as shown by the dotted line and the solid line in the figure, the dotted line and the solid line are the amplitude maps of the signals output by the calibration devices of two different phases, but the position with the highest phase alignment accuracy is still 180 degrees.

S25. Convert the Mth composite signal into a voltage signal.

Optionally, based on the embodiment, step S25 may specifically include:

Specifically, the means for converting the Mth composite signal into a voltage signal is performed by a detector in the detector of FIG. 2, and the detector includes a detector having a positive slope.

The detector can convert the power signal into a voltage signal, that is, convert the power signal in dBm into a voltage signal in V, and the specific conversion formula is:

(V)=(0.05*10 ^(dBm/10) )^ ^(0.5)

S26. Change a phase shift phase value N of the test power signal output by the target channel to obtain a new composite signal and a voltage signal until 360 degree phase shift is completed, thereby obtaining phase shift phase values and output voltages of the target channels. Correspondence relationship; where M is a positive integer; N is a positive number;

Optionally, on the basis of this embodiment, referring to FIG. 6, step S26 may specifically include:

S36, such that N = (M-1) × P; wherein P is a predetermined value less than 360;

Specifically, P can be 5.625. M is a positive integer. Specifically, M can start from 1.

S37, determining whether N is greater than 360; when N is greater than 360, step S39 is performed; if N is not greater than 360, step S38 is performed;

Specifically, since it is necessary to complete the 360-degree phase shift, it is necessary to determine whether N is greater than 360.

S38, making M=M+1;

Wherein, when M=M+1, N becomes 2 times of the original, and returns to step S33, so that a voltage signal can be acquired again, and the above steps are repeatedly performed, and each phase of each target channel is acquired. The correspondence between the displacement phase value and the output voltage.

S39, determining whether a phase relationship between a phase shift phase value and an output voltage of any one of the plurality of channels other than the reference channel is obtained; if it is determined that a plurality of the channels are obtained, except for the reference channel The corresponding relationship between the phase shift phase value of any one of the channels and the output voltage ends; if it is not determined that phase shift phase values and output voltages of any of the plurality of channels other than the reference channel are obtained Corresponding relationship returns to step S31.

In the present embodiment, the judging step S39 is added in order to ensure that the correspondence relationship between the phase value of each phase of each target channel and the output voltage is obtained.

The corresponding relationship between the phase shift phase value of the target channel and the output voltage includes a mapping relationship between a plurality of phase shift phase values and an output voltage, and each phase shift phase value corresponds to an output voltage.

In this embodiment, the steps in this embodiment can be performed a plurality of times in a loop, and the corresponding relationship between the phase shift phase values of each phase channel and the output voltage can be obtained.

Optionally, based on the previous embodiment, step S24 may include:

1) for each target channel, determining a phase shift phase value corresponding to the minimum voltage value from the corresponding relationship between the phase shift phase value of the target channel and the output voltage;

In this embodiment, since a detector with a positive slope is used, the minimum output voltage value is found. Specifically, when a detector with a positive slope is used, the minimum output voltage corresponds to the minimum output power, and the minimum output power is found, thereby calculating the phase difference, selecting the minimum output power, and not selecting the maximum output power. Because when the maximum output power is selected, the small output power changes are not obvious and are not easily detected, so the accuracy of phase calibration is low. However, when the minimum output power is selected, the small output power change is relatively obvious, and it is easy to be It is detected, so the accuracy of phase calibration is high.

However, when a detector with a negative slope is used, it is necessary to find the maximum output voltage at this time, because the output voltage is inversely proportional to the output power, and the larger the output voltage, the smaller the corresponding output power.

2) Obtain a phase difference between each target channel and the reference channel according to the determined phase shift phase value to perform phase calibration on the target channel.

Phase calibration is performed for each target channel to eliminate the phase difference between the target channel and the reference channel.

Optionally, based on this embodiment, the step may include:

1) If the phase shift phase value is between 0 and 180 degrees, set the phase difference between the target channel and the reference channel to a difference between 180 degrees and the phase shift phase value, and set the difference between the phase of the target channel and the reference channel. The phase difference obtained for the calculation;

2) If the phase shift phase value is between 180 and 360 degrees, set the phase difference between the target channel and the reference channel to a difference between 180 degrees and the phase shift phase value or a difference between 540 degrees and the phase shift phase value And set the difference between the phase of the target channel and the reference channel to the calculated phase difference.

Specifically, when the phase difference phase value corresponding to the minimum output voltage value is between 0 and 180 degrees, the phase difference between the target channel and the reference channel is 180-the phase shift phase value corresponding to the minimum output voltage value;

When the phase difference phase value corresponding to the minimum output voltage value is between 180 degrees and 360 degrees, the phase difference between the target channel and the reference channel is 180-the minimum phase value corresponding to the output voltage value, or 540. - The phase shift phase value corresponding to the minimum output voltage.

The phase shift value of the corresponding target channel is adjusted according to the phase difference between each target channel and the reference channel.

Specifically, after calculating the phase difference between the target channel and the reference channel, the phase shift value of the phase shifter connected to the target channel is adjusted from zero to the value of the phase difference or 360 degrees minus the phase difference value, that is, it can be guaranteed There is no phase difference between the target channel and the reference channel.

Assuming that the phase difference between the target channel and the reference channel is 120 degrees, the phase shift value of the phase shifter connected to the target channel should be adjusted to 120 degrees or -240 degrees.

It should be noted that in this embodiment, one target channel is selected for phase calibration, and another target channel is selected for phase calibration until all target channels are phase-aligned and completed. Since all target channel phase calibrations are referenced to the reference channel, there is no phase difference in the final phase between the channels.

In this embodiment, the phase difference between each target channel and the reference channel is first calculated, and then the phase shift value of the corresponding target channel can be adjusted according to the phase difference between each target channel and the reference channel.

A method for calibrating the phase in the present invention can be more clearly understood by those skilled in the art, and is now explained in conjunction with Table 1.

Table 1 Correspondence between phase shift phase value and output voltage

Figure 1 shows the phase-shift phase value of the phase shifter connected to the target channel obtained by the processor and the output voltage. As can be seen from Figure 1, the minimum output voltage is 0.5593V, corresponding to the phase of the phase shifter. The phase value of the displacement is 298.125°, and the phase difference between the target channel and the reference channel is calculated to be 241.875° or -118.125°. Furthermore, the phase shift value of the phase shifter connected to the target channel is set to 241.875° or -118.125°, which ensures that there is no phase difference between the target channel and the reference channel.

Optionally, on the basis of the foregoing embodiment, another embodiment of the present invention provides a phase calibration circuit. Referring to FIG. 2, the method may include:

a signal source 101, a plurality of channels 201-20m, a plurality of phase shifters 301-30m, a detecting device 401, and a processor 402; wherein the signal source 101 is respectively connected to each of the channels, and each of the channels is respectively Connecting one of the phase shifters, each of the phase shifters being respectively connected to the processor 402 and the detecting device 401, wherein the detecting device 401 is connected to the processor 402; each of the channels is connected The phase shifter is different, one channel is used as a reference channel, and all the channels except the reference channel are sequentially used as target channels;

The signal source 101 is configured to generate a test power signal.

Each of the channels is configured to transmit the test power signal;

a phase shifter connected to each of the target channels, configured to receive a phase shift instruction sent by the processor 402 multiple times, and adjust a phase of a test power signal output by the corresponding target channel, and receive the processor The phase adjustment command sent to adjust the phase shift phase;

The detecting device 401 is configured to receive and output a plurality of phase-shifted test power signals outputted by the phase shifter connected to each of the target channels, and a plurality of test powers output by the phase shifter connected to the reference channel a signal, generating a corresponding relationship between a phase shift phase value of each phase shifter connected to the target channel and an output voltage;

The processor 402 is configured to generate a phase shifting instruction of each phase channel connected phase shifter, and send it to a corresponding phase shifter, and phase shift phase of the phase shifter connected according to each of the target channels The corresponding relationship between the value and the output voltage generates a phase adjustment command and sends it to the corresponding phase shifter.

Optionally, on the basis of this embodiment, referring to FIG. 7, the signal source 101 includes:

a signal generating device 1011, a distributor 1012, and a plurality of switches;

The signal generating device 1011 is connected to the distributor 1012, and the distributor 1012 is respectively connected to each of the switches, and each of the switches is respectively connected to one of the channels; wherein each of the switches is connected Different channels;

The signal generating device 1011 is configured to generate a total power test signal;

The distributor 1012 is configured to divide the total power test signal into a plurality of the same power test signals that are the same as the number of the switches;

It should be noted that, in the present invention, a plurality of switches are combined into one switch group 1013.

After the signal generating device 1011 generates the total test signal, the distributor 1012 divides the total test signal into a plurality of identical test power signals of the same number as the switch, and a switch between the distributor 1012 and the channel, when the switch is turned off, the distributor The 1012 is connected to the channel, and the test power signal is input into the channel. When the switch is turned on, the distributor 1012 is disconnected from the channel, and the test signal cannot be input into the channel.

It should be noted that the test power signal is input only to the reference channel and the target channel at a time, that is, the switch with the reference channel and the target channel is in a closed state.

Specifically, the working process of each device in this embodiment is:

First, a reference channel and a target channel are determined. After the signal generating device 1011 generates the total power test signal, the same test power signal is input to the reference channel and the target channel through the switch control, wherein the switches corresponding to the remaining channels are in the off state, Enter the test power signal.

The reference channel and the target channel transmit test power signals. Since the reference channel and the target channel are affected by electromagnetic interference, the test power signals output by the reference channel and the target channel may be different.

The test power signal outputted by the reference channel and the target channel passes through a phase shifter, and the phase shifter receives the phase shifting instruction sent by the processor 402 according to the method in the above method step, and performs multiple phase adjustment on the test power signal output by the target channel. A plurality of phase-shifted test power signals are obtained. The test power signal outputted by the reference channel is not phase-shifted by the phase shifter through the corresponding phase shifter, and a plurality of test power signals output by the plurality of phase shifters connected to the reference channel are also obtained.

The detecting device 401 receives and generates, according to a plurality of phase-shifted test power signals output by the phase shifter connected to each of the target channels, and a plurality of test power signals output by the phase shifter connected to the reference channel. Corresponding relationship between the phase shift phase value of each phase channel connected to the target channel and the output voltage.

The processor 402 is configured according to a phase shift phase value of the phase shifter connected to each of the target channels and an output voltage.

According to the steps in the above method, the difference between the phase of the target channel and the reference channel is determined, and a phase adjustment command is generated and sent to the corresponding phase shifter for phase adjustment operation.

The invention can perform phase calibration on multiple channels by the above-mentioned phase calibration circuit, and solves the problem that there is no method for phase calibration of multiple channels at present.

Optionally, on the basis of the foregoing embodiment, referring to FIG. 7, each of the channels further includes:

The coupler is configured to receive the power test signal;

Specifically, referring to FIG. 7, three channels are illustrated. The first channel includes a coupler 2014, a filter 2011, an amplifier 2012, and a limiting device 2013. The second channel includes a coupler 2024, a filter 2021, and an amplifier 2022. And the limiting device 2023, the mth channel includes a coupler 20m4, a filter 20m1, an amplifier 20m2, and a limiting device 20m3.

In this embodiment, the working process of each device is:

After the coupler receives the test power signal, the filter filters the test power signal, and the limiting device performs a limiting operation on the filtered signal, and the amplifier amplifies the limited signal to obtain an output test power signal.

In addition, FIG. 7 further includes an antenna 501, an antenna 502, and an antenna 50m. The antenna can receive electromagnetic waves emitted by other devices, that is, receive corresponding signals, and can also emit electromagnetic waves, that is, can transmit corresponding signals.

In this embodiment, the test power signal is sequentially passed through the filter, the limiting device, and the amplifier, thereby obtaining a test power signal with better strength.

Optionally, on the basis of the previous embodiment, referring to FIG. 7, the detecting device includes:

a synthesizer 4011 and a detector 4012; the synthesizer 4011 is coupled to the detector 4012;

The synthesizer 4011 is configured to receive and output a plurality of test power signals output by the phase shifter connected to the reference channel, and a plurality of phase shift outputs of the phase shifter connected to each of the target channels The subsequent test power signal is subjected to power synthesis to obtain a plurality of composite signals;

The detector 4012 is configured to receive and obtain, according to the plurality of the composite signals, a corresponding relationship between a phase shift phase value and an output voltage of the phase shifter connected to each of the target channels.

In this embodiment, the synthesizer 4011 and the detector 4012 can implement the functions in the embodiment according to the corresponding steps in the above method embodiments.

It should be noted that the load 403 is connected in FIG. 7. In order to simultaneously input the composite signal into the load 403 and the detector 4012, a coupler 4013 is added between the combiner 4011 and the detector 4012 for synthesizing. A small portion of the signal output from the signal output from the device 4011 is input to the detector 4012.

In this embodiment, the detector 4012 can obtain a corresponding relationship between the phase shift phase value and the output voltage of the phase shifter connected to each of the target channels. Further, a phase adjustment command can be generated based on the correspondence relationship between the displacement phase value and the output voltage.

Optionally, on the basis of the previous embodiment, the processor is configured to generate a phase adjustment instruction according to a corresponding relationship between a phase shift phase value and an output voltage of a phase shifter connected to each of the target channels, and specifically to:

Further, the processor is configured to obtain a phase adjustment instruction of each target channel and the reference channel according to the determined phase shift phase value, and generate a phase adjustment instruction, so as to perform phase calibration on the target channel, specifically:

It should be noted that, for the function of the processor in this embodiment, refer to the corresponding explanation in the foregoing method embodiment, and details are not described herein again.

In this embodiment, the phase adjustment commands of different target channels can be determined according to the phase shift phase values corresponding to different minimum voltages, and the phase difference between each target channel and the reference channel is eliminated.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

A method for calibrating a phase, comprising:

Obtain multiple channels to be calibrated;

Selecting one of the plurality of channels as a reference channel;

Determining a correspondence between a phase shift phase value of each target channel and an output voltage; wherein the target channel is any one of the plurality of the channels except the reference channel;

The phase shift value of each target channel is adjusted according to the corresponding relationship between the phase shift phase value of each target channel and the output voltage.
The calibration method according to claim 1, wherein the determining the correspondence between the phase shift phase value of each target channel and the output voltage comprises:

Selecting one of the plurality of channels as a target channel; wherein the target channel is different from the reference channel;

Input the same test power signal for the reference channel and the target channel respectively;

And phase-shifting the phase of the test power signal output by the target channel by N degrees;

Performing power synthesis on the phase-shifted test power signal and the test power signal outputted by the reference channel to obtain an Mth composite signal;

Converting the Mth composite signal into a voltage signal;

Changing the phase shift phase value N of the test power signal outputted by the target channel to obtain a new composite signal and a voltage signal until 360 degree phase shift is completed, thereby obtaining a correspondence between the phase shift phase values of the target channels and the output voltage Relationship; where M is a positive integer; N is a positive number;

Determining whether a corresponding relationship between a phase shift phase value and an output voltage of any one of the plurality of channels other than the reference channel is obtained;

If it is determined that the phase shift phase value of any one of the plurality of channels other than the reference channel and the output voltage are not obtained, returning one channel from the plurality of channels as the target channel And stopping until a corresponding relationship between the phase shift phase values of any one of the plurality of channels except the reference channel and the output voltage is obtained.
The calibration method according to claim 2, wherein the phase shift phase value N of the test power signal outputted by the target channel is changed to obtain a new composite signal and a voltage signal until 360 degree phase shift is completed, thereby obtaining a Corresponding relationship between the phase value of each phase of the target channel and the output voltage, including:

Let N = (M-1) × P; where P is a predetermined value less than 360;

Determine whether N is greater than 360;

If it is determined that N is not greater than 360, M=M+1, and returning the phase shift phase N of the test power signal outputted by the target channel to obtain an output voltage corresponding to the Mth composite signal until N is greater than 360. Thereby, the corresponding relationship between the phase shift phase values of the target channel and the output voltage is obtained.
The calibration method according to claim 3, wherein the adjusting the phase shift value of each target channel according to the corresponding relationship between the phase shift phase value of each target channel and the output voltage comprises:

For each target channel, the phase shift phase value corresponding to the minimum voltage value is determined from the corresponding relationship between the phase shift phase value of the target channel and the output voltage;

The phase difference between each target channel and the reference channel is obtained according to the determined phase shift phase value to perform phase calibration on the target channel.
The calibration method according to claim 4, wherein the phase difference between each target channel and the reference channel is obtained according to the determined phase shift phase value, so as to perform phase calibration on the target channel, including:

If the phase shift phase value is between 0 and 180 degrees, set the phase difference between the target channel and the reference channel to be 180 degrees from the phase shift phase value, and set the difference between the phase of the target channel and the reference channel as the calculation. The resulting phase difference;

If the phase shift phase value is between 180 and 360 degrees, the phase difference between the target channel and the reference channel is set to a difference between 180 degrees and the phase shift phase value or a difference between 540 degrees and the phase shift phase value, and Set the difference between the phase of the target channel and the reference channel to the calculated phase difference.
The calibration method according to claim 2, wherein the phase-compared test power signal and the test power signal outputted by the reference channel are subjected to power synthesis to obtain an Mth composite signal, including:

The vector summation algorithm is used to synthesize the test power signal outputted by the reference channel and the phase-shifted test power signal to obtain an Mth composite signal.
The calibration method according to claim 2, wherein converting the Mth synthesis signal into a voltage signal comprises:

Converting the Mth composite signal into a voltage signal to obtain an output voltage corresponding to the Mth composite signal.
A phase calibration circuit, comprising:

a signal source, a plurality of channels, a plurality of phase shifters, a detecting device, and a processor; wherein the signal sources are respectively connected to each of the channels, and each of the channels is respectively connected to one of the phase shifters, each The phase shifters are respectively connected to the processor and the detecting device, and the detecting device is connected to the processor; the phase shifters connected to each of the channels are different, and one channel is used as a reference channel, except All of the channels other than the reference channel are sequentially used as target channels;

Wherein the signal source is used to generate a test power signal;

Each of the channels is configured to transmit the test power signal;

a phase shifter connected to each of the target channels, configured to receive a phase shift instruction sent by the processor multiple times, and adjust a phase of a corresponding test power signal output by the target channel, and receive the processor to send The phase adjustment command adjusts the phase shift phase;

The detecting device is configured to receive and output a plurality of phase-shifted test power signals outputted from the phase shifter connected to each of the target channels, and a plurality of test power signals output by the phase shifter connected to the reference channel Generating a corresponding relationship between a phase shift phase value of each phase shifter connected to the target channel and an output voltage;

The processor is configured to generate a phase shifting instruction of each phase channel connected phase shifter, and send it to a corresponding phase shifter, and a phase shift phase value of the phase shifter connected according to each of the target channels Corresponding to the output voltage, a phase adjustment command is generated and sent to the corresponding phase shifter.
The calibration circuit of claim 8 wherein said signal source comprises:

a signal generating device, a distributor, and a plurality of switches;

The signal generating device is connected to the dispenser, the dispenser is respectively connected to each of the switches, and each of the switches is respectively connected to one of the channels; wherein each channel of each of the switches is different ;

The signal generating device is configured to generate a total power test signal;

The distributor is configured to divide the total power test signal into a plurality of the same power test signals that are the same as the number of the switches;

The switch is configured to select whether each of the channels inputs the power test signal.
The calibration circuit of claim 8 wherein each of said channels further comprises:

a coupler, a filter, an amplifier, and a limiting device; the coupler, the filter, the limiting device, and the amplifier are sequentially connected;

The coupler is configured to receive the power test signal;

The filter is configured to perform a filtering operation on the power test signal;

The limiting device is configured to perform a limiting operation on the filtered signal;

The amplifier is configured to perform an amplification operation on the clipped signal to obtain a test power signal that is finally outputted by the channel.
The calibration circuit of claim 8 wherein said detecting means comprises:

a synthesizer and a detector; the synthesizer is coupled to the detector;

a synthesizer, configured to receive and output a plurality of test power signals output by the phase shifter connected to the reference channel, and a plurality of phase shift outputs of the phase shifter connected to each of the target channels The test power signal is subjected to power synthesis to obtain a plurality of composite signals;

The detector is configured to receive and according to the plurality of the composite signals, obtain a correspondence between a phase shift phase value and an output voltage of the phase shifter connected to each of the target channels.
The calibration circuit according to claim 8, wherein the processor is configured to generate a phase adjustment instruction according to a corresponding relationship between a phase shift phase value of the phase shifter connected to each of the target channels and an output voltage, Used for:

For each target channel, the phase shift phase value corresponding to the minimum voltage value is determined from the corresponding relationship between the phase shift phase value of the target channel and the output voltage;

A phase difference between each target channel and the reference channel is obtained according to the determined phase shift phase value, and a phase adjustment command is generated to perform phase calibration on the target channel.
The calibration circuit according to claim 12, wherein the processor is configured to obtain a phase difference between each target channel and the reference channel according to the determined phase shift phase value, and generate a phase adjustment instruction to perform the target channel When phase calibration, it is specifically used to:

If the phase shift phase value is between 0 and 180 degrees, the phase difference between the target channel and the reference channel is set to be the difference between the phase and the phase shift phase value, and the first phase adjustment command is generated and sent to the target channel; The first phase adjustment command is configured to set a difference between phases of the target channel and the reference channel to the calculated phase difference;

If the phase shift phase value is between 180 and 360 degrees, the phase difference between the target channel and the reference channel is set to a difference between 180 degrees and the phase shift phase value or a difference between the 540 degrees and the phase shift phase value is generated. And sending a second phase adjustment command to the target channel;

The second phase adjustment command is configured to set a difference between phases of the target channel and the reference channel to the calculated phase difference.