Phase determination method and device, phase calibration method, medium, and antenna device

Abstract

The present disclosure provides a method for determining a target initial phase, including: obtaining the voltage amplitude of a system DC offset signal of a phased array system corresponding to N target channels to be calibrated; respectively obtaining the voltage amplitude of the overall DC offset signal under different initial phases, and for any initial phase, the overall DC offset signal is the overall DC offset signal of the initial mixing signal output by the mixer downstream of the power synthesizer of the phased array system after providing a test signal to the N target channels; calculating the voltage amplitude of the mixing DC offset signal of the N target channels under different initial phase conditions, and taking the initial phase of the N target channels when the voltage amplitude of the mixing DC offset signal reaches a maximum value as the target initial phase of the N target channels. The present disclosure also provides a phase calibration method, an initial phase determination device, and an antenna system. The phase calibration method provided by the present disclosure does not introduce additional calibration deviations, thereby improving the calibration accuracy.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular, to a target initial phase determination method for a phased array system, a target initial phase determination device for implementing the target initial phase determination method, a computer-readable storage medium, and an antenna device. Background Art

[0002] Phased array technology has the capabilities of beamforming and beam scanning, which can significantly improve the signal-to-noise ratio and sensitivity of wireless communication systems. In addition, phased array technology can also reduce the power and noise requirements of a single channel in the phased array system, making phased array technology widely used.

[0003] Figure 1 The diagram shown in the figure is a typical phased array system framework. Figure 1 As shown in , the power synthesis or distribution network distributes power to each channel. The beam direction can be changed through the controllable phase difference of different channels, and effective beam synthesis can be performed.

[0004] However, due to the large number of channels in the phased array system, it is difficult to ensure that the initial phases of all channels are the same due to manufacturing deviations and inconsistencies in the surrounding environment, which in turn causes a decrease in beamforming performance.

[0005] Therefore, how to calibrate the phase of each channel in a phased array system has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0006] The object of the present disclosure is to provide a target initial phase determination method for a phased array system, a target initial phase determination device for implementing the target initial phase determination method, a computer-readable storage medium, and an antenna device.

[0007] As a first aspect of the present disclosure, a method for determining a target initial phase is provided, comprising:

[0008] Acquire voltage amplitudes of system DC offset signals of the phased array system corresponding to the N target channels to be calibrated;

[0009] Respectively acquiring voltage amplitudes of the overall DC offset signal at different initial phases, wherein for any initial phase, the overall DC offset signal is an overall DC offset signal of an initial mixing signal output by a mixer downstream of a power synthesizer of the phased array system after providing a test signal to N target channels;

[0010] Calculate the voltage amplitudes of the mixed DC offset signals of the N target channels under different initial phase conditions, and use the initial phases of the N target channels when the voltage amplitude of the mixed DC offset signal reaches a maximum value as the target initial phases of the N target channels; wherein the voltage amplitude of the mixed DC offset signal is calculated using the following formula:

[0011]

[0012] in, is the voltage amplitude of the initial DC offset signal;

[0013] is the voltage amplitude of the initial mixing signal;

[0014] is the voltage amplitude of the mixing DC offset signal;

[0015] N is the number of channels of the phased array system.

[0016] Optionally, the target channel is a receiving channel, and in the step of obtaining the voltage amplitude of the system DC offset signal of the phased array system corresponding to the N target channels to be calibrated, the voltage amplitude of the system DC offset signal is a parameter output by an analog-to-digital converter ADC downstream of the mixer after the N receiving channels are opened.

[0017] Optionally, the test signal provided to the N target channels is a single tone signal transmitted by a transmitting antenna of a single channel for calibration.

[0018] In the step of respectively acquiring the voltage amplitude of the overall DC offset signal at different initial phases, the voltage amplitude of the overall DC offset signal is a parameter output by the ADC after N receiving channels are opened.

[0019] Optionally, the target channel is a transmitting channel, and in the step of obtaining the voltage amplitude of the system DC offset signal of the phased array system corresponding to the N target channels to be calibrated, the voltage amplitude of the system DC offset signal is a parameter output by an analog-to-digital converter ADC downstream of the mixer after the receiving channel for calibration is opened.

[0020] Optionally, the test signal provided to the N target channels is a single tone signal transmitted by a multi-channel transmitting antenna of a phased array channel.

[0021] In the step of respectively acquiring the voltage amplitude of the overall DC offset signal at different initial phases, the voltage amplitude of the overall DC offset signal is a parameter output by the ADC after the receiving channel for calibration is opened.

[0022] As a second aspect of the present disclosure, a phase calibration method is provided, comprising:

[0023] Generate a system DC offset signal of the phased array system corresponding to the N target channels to be calibrated, and output a system DC offset parameter;

[0024] Adjusting the initial phases of the N target channels, adjusting the initial phases of the N target channels to a phase value each time, providing a test signal to the N target channels, so that a mixer downstream of a power synthesizer of the phased array system outputs an overall DC offset signal, and outputs a voltage amplitude of the overall DC offset signal;

[0025] Determine the target initial phases of N target channels using the target initial phase determination method described in the first aspect of the present disclosure;

[0026] The initial phase of each target channel is adjusted to the target initial phase respectively.

[0027] Optionally, the target channel is a receiving channel, and the step of generating a system DC offset signal of the phased array system corresponding to the N target channels to be calibrated and outputting a system DC offset parameter includes:

[0028] Opening N receiving channels;

[0029] The output value of the analog-to-digital converter ADC of the phased array system is used as the voltage amplitude of the direct current offset signal of the system.

[0030] Optionally, the step of providing a test signal to the N target channels so that a mixer downstream of a power combiner of the phased array system outputs an overall DC offset signal and generating a voltage amplitude of the overall DC offset signal comprises:

[0031] Transmitting a single tone signal used as a test signal using a transmitting antenna of a single channel for calibration;

[0032] N receiving channels are opened, and the parameter output by the ADC is used as the voltage amplitude of the overall DC offset signal.

[0033] Optionally, the target channel is a transmitting channel, and the steps of generating a system DC offset signal of the phased array system and outputting a system DC offset parameter include:

[0034] Open the receiving channel for calibration;

[0035] The output value of the analog-to-digital converter ADC of the phased array system is used as the voltage amplitude of the direct current offset signal of the system.

[0036] Optionally, the step of providing a test signal to the N target channels so that a mixer downstream of a power combiner of the phased array system outputs an overall DC offset signal and generating a voltage amplitude of the overall DC offset signal comprises:

[0037] Transmitting a single tone signal used as the test signal using a multi-channel transmitting antenna;

[0038] The receiving channel for calibration is opened, and the parameter of the ADC output downstream of the mixer is used as the voltage amplitude of the overall DC offset signal.

[0039] As a third aspect of the present disclosure, a target initial phase determination device is provided, comprising:

[0040] A storage module on which an executable program is stored;

[0041] One or more processors, wherein the one or more processors call the executable program to implement the above-mentioned target initial phase determination method provided by the present disclosure.

[0042] As a fourth aspect of the present disclosure, a computer-readable storage medium is provided, on which an executable program is stored, and when the executable program is called, the above-mentioned target initial phase determination method provided by the present disclosure can be implemented.

[0043] As a fifth aspect of the present disclosure, an antenna device is provided, including:

[0044] Phased array systems; and

[0045] The target initial phase determining device.

[0046] In the phase calibration method provided by the present disclosure, the target initial phase of each target channel can be obtained by the self-mixing principle of the signal of each channel in the phased array system passing through the mixer, and the calibration process is simple. Moreover, since no additional calibration device is required, no additional calibration deviation is introduced, thereby improving the calibration accuracy.

[0047] The target initial phase determination device can improve the phase calibration accuracy of each channel in the phased array system, thereby improving the beamforming performance of the antenna device. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0049] Figure 1 It is a framework diagram of a phased array system in the related art;

[0050] Figure 2 It is the principle diagram of the mixer;

[0051] Figure 3 is a flow chart of an implementation of a method for determining a target initial phase provided by the present disclosure;

[0052] Figure 4 is a flow chart of an implementation of the phase calibration method provided by the present disclosure;

[0053] Figure 5 is a flow chart of calibrating a receiving channel using the phase calibration method provided by the present disclosure;

[0054] Figure 6 is an architecture diagram for calibrating a receiving channel using the phase calibration method provided by the present disclosure;

[0055] Figure 7 is a flow chart of calibrating a transmission channel using the phase calibration method provided by the present disclosure;

[0056] Figure 8 is an architecture diagram for calibrating a transmission channel using the phase calibration method provided by the present disclosure;

[0057] Fig. 9 It is an architecture diagram for calibrating a receiving channel in a dual-channel phased array system using the phase calibration method provided by the present disclosure;

[0058] Fig.10 It is an architecture diagram for calibrating the transmit channel in a dual-channel phased array system using the phase calibration method provided by the present disclosure. DETAILED DESCRIPTION

[0059] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0060] As a first aspect of the present disclosure, a method for determining a target initial phase is provided, such as Figure 2 As shown, the target initial phase determination method includes:

[0061] In step S110, the voltage amplitude of the system DC offset signal of the phased array system corresponding to the N target channels to be calibrated is obtained;

[0062] In step S120, the voltage amplitudes of the overall DC offset signal at different initial phases are respectively obtained. For any initial phase, the overall DC offset signal is the overall DC offset signal of the initial mixing signal output by the mixer downstream of the power synthesizer of the phased array system after providing the test signal to the N target channels;

[0063] In step S130, the voltage amplitudes of the mixing DC offset signals of the N target channels under different initial phase conditions are calculated, and the phases of the N target channels when the voltage amplitudes of the mixing DC offset signals reach a maximum value are used as the target initial phases of the N target channels.

[0064] The voltage amplitude of the mixed DC offset signal is calculated using the following formula (1):

[0065]

[0066] in, is the voltage amplitude of the system DC offset signal;

[0067] is the voltage amplitude of the overall mixing signal;

[0068] is the voltage amplitude of the mixing DC offset signal;

[0069] N is the number of channels of the phased array system.

[0070] It should be pointed out that “respectively obtaining the voltage amplitudes of the overall DC offset signal at different phases” here means that each time the voltage amplitude of the overall DC offset signal is obtained, the initial phases of the N target channels are the same.

[0071] The target initial phase determination method provided in the present disclosure is a method based on the mixer principle. Figure 3 The principle of a mixer is briefly described.

[0072] The mixer is equivalent to an analog multiplier. Assume that the gain of the mixer is A. MIXER , then the output signal of the mixer is as shown in formula (2):

[0073]

[0074] Among them, V RF is the voltage amplitude of the RF signal;

[0075] V LO is the voltage amplitude of the local oscillator signal;

[0076] w RF is the angular frequency of the local oscillator signal;

[0077] φ RF is the RF signal phase;

[0078] is the phase of the local oscillator signal.

[0079] The first equation of formula (2) shows that the basic mathematical principle of mixer mixing is the multiplication of two signals, which can be converted into frequency domain addition or subtraction in the second equation of formula (2) through the product and difference formula.

[0080] A low-pass filter is usually set at the output of the mixer to filter out the high-frequency terms in formula (2). The resulting output signal is shown in formula (3):

[0081]

[0082] Formula (3) shows that after taking the difference frequency signal generated by mixing, the frequency is the frequency of the two mixing signals subtracted, and the initial phase is also the initial phase of the two mixing signals subtracted.

[0083] If the input signal frequency is the same as the local oscillator signal frequency, the mixer output signal is a DC signal. The amplitude V of the DC signal is calculated by formula (4): OUT ':

[0084]

[0085] From formula (4), we can know that if the frequencies of the two mixing signals are the same, the final mixing output is a DC quantity, and the magnitude of the DC quantity is related to the initial phases of the two mixing signals. When the initial phases of the two mixing signals are the same, the DC quantity output by the mixer reaches the maximum value.

[0086] After each target channel receives the test signal, each target channel can process the test signal (for example, amplify it), and then the power synthesizer superimposes the signals output by multiple target channels. Since different target channels have different initial phases, the signal y obtained by superposition is shown in formula (5):

[0087]

[0088] Wherein, i is the number of the target channel, i is a variable, and i is a positive integer, and 1≤i≤N;

[0089] A i is the gain of the i-th target channel;

[0090] w*t represents a periodic function;

[0091] is the initial phase of the i-th target channel.

[0092] The signal obtained by mixing the superimposed signal y through the mixer can be expressed by formula (6):

[0093]

[0094] Wherein, B is the voltage amplitude of the local oscillator signal;

[0095] V out mix is the initial mixing signal parameter;

[0096] is the phase of the local oscillator signal.

[0097] After the high-frequency signal is filtered out by the low-pass filter, the remaining DC offset parameter (that is, the overall DC offset parameter) is shown in formula (7):

[0098]

[0099] If the frequency of the signal in the target channel is the same as the frequency of the local oscillator signal, and the difference frequency signal remaining after filtering out the high-frequency signal is a DC quantity, the DC quantity is the initial phase of all cosine signal functions. The initial phase of the local oscillator signal The maximum value is obtained when they are the same.

[0100] The mixed DC offset signal generated by the mixer after mixing will be superimposed with the initial system DC offset signal of the phased array system (i.e., the initial system DC offset signal obtained in step S110), and the overall DC offset signal of the phased array system is obtained. Therefore, when determining the DC offset signal generated by the mixed signal of the test signal in each channel (i.e., the mixed DC offset signal), it is necessary to subtract the system initial offset signal from the overall DC offset signal obtained by the analog-to-digital converter output. Therefore, the mixed DC offset signal can be obtained by the above formula (1).

[0101] The mixing DC offset signal parameter in formula (1) is the optimization target, adjusting the phase of each channel, when the mixing DC offset signal parameter When it reaches the maximum value, it indicates that the initial phases of all channels are the same and equal to the initial phases of the local oscillator signal.

[0102] In the related art, the initial phase calibration of the channel is usually performed by adding a coupler to the antenna end of the phased array system and combining it with a phase detector. In this method, a coupler needs to be introduced at each antenna port, and there are complex signal routings from the coupler to the phase detector, which makes the solution complicated. In addition, the inconsistency of a large number of routings between the coupler and the phase detector will cause calibration deviations and reduce the calibration accuracy. In the target initial phase determination method provided in the present disclosure, the target initial phase of each target channel can be obtained only through the self-mixing principle of the signals of each channel in the phased array system through the mixer, and the calibration process is simple. Moreover, since there is no need to introduce additional calibration devices, no additional calibration deviations will be introduced, thereby improving the calibration accuracy.

[0103] The target channel may be a receiving channel or a transmitting channel. The following describes the initial phase determination method in detail for two cases where the target channel is a receiving channel and the target channel is a transmitting channel.

[0104] When the target channel is a receiving channel, the voltage amplitude of the system DC offset signal in step S110 is obtained by the following steps:

[0105] Opening N receiving channels;

[0106] The output value of the analog-to-digital converter ADC of the phased array system is determined as the voltage amplitude of the direct current offset signal of the system.

[0107] That is to say, the voltage amplitude of the system DC offset signal in step S110 is a parameter output by the analog-to-digital converter ADC downstream of the mixer after N receiving channels are opened.

[0108] It should be noted that when the receiving channel is opened, the N target channels need to be opened without applying external input to the phased array system. In addition, the voltage amplitude of the initial system DC offset signal obtained is the parameter voltage amplitude corresponding to the sum of the DC offset signals generated by all devices (e.g., transimpedance amplifier, filter, etc.) from the mixer to the ADC of the phased array system, which is also the voltage amplitude parameter of the system DC offset signal of the phased array system.

[0109] Further, in the present disclosure, the test signal is not particularly limited. In the case where the target signal is a receiving channel, as an optional implementation, the test signal is a single tone signal emitted by a transmitting antenna of a single channel for calibration.

[0110] Accordingly, in step S120 of acquiring the overall DC offset parameter of the initial mixing signal output by the mixer downstream of the power synthesizer corresponding to the N target channels, the overall DC offset parameter is a parameter output by the ADC after the N receiving channels are turned on.

[0111] When the target channel is a reflection channel, in step S110, the voltage amplitude of the system DC offset signal is a parameter output by the analog-to-digital converter ADC downstream of the mixer after the receiving channel for calibration is opened.

[0112] In the present disclosure, the test signal is not particularly limited. As an optional implementation, the test signal provided to the N target channels is a single-tone signal transmitted by a multi-channel transmitting antenna of a phased array channel. Accordingly, in step S120, the voltage amplitude of the overall DC offset signal is a parameter output by the ADC after the receiving channel for calibration is opened.

[0113] As a second aspect of the present disclosure, a phase calibration method is provided, wherein: Figure 3 As shown, the phase calibration method includes:

[0114] In step S210, a system DC offset signal of the phased array system corresponding to the N target channels to be calibrated is generated, and a system DC offset parameter is output;

[0115] In step S220, the initial phases of the N target channels are adjusted, and the initial phases of the N target channels are adjusted to a phase value each time, and a test signal is provided to the N target channels, so that a mixer downstream of a power synthesizer of the phased array system outputs an overall DC offset signal, and outputs a voltage amplitude of the overall DC offset signal;

[0116] In step S230, the target initial phases of N target channels are determined using the initial phase determination method provided in the first aspect of the present disclosure;

[0117] In step S240, the initial phase of each target channel is adjusted to the target initial phase.

[0118] In the phase calibration method provided by the present disclosure, the target initial phase of each target channel can be obtained by the self-mixing principle of the signal of each channel in the phased array system passing through the mixer, and the calibration process is simple. Moreover, since no additional calibration device is required, no additional calibration deviation is introduced, thereby improving the calibration accuracy.

[0119] In the present disclosure, there is no special limitation on how to adjust the phase of each target channel in step S220. Each channel of the phased array system corresponds to a phase shifter, and the phase shifter can be used to adjust the phase of each target channel.

[0120] As described above, the target channel may be a receiving channel or a transmitting channel. The following describes the phase calibration method when the target channel is a receiving channel and when the target channel is a transmitting channel.

[0121] Specifically, when the target channel is a receiving channel:

[0122] like Figure 5 As shown, step S210 may include:

[0123] In step S211a, N receiving channels are opened;

[0124] In step S212a, the output value of the analog-to-digital converter of the phased array system is used as the voltage amplitude of the system DC offset signal.

[0125] In the present disclosure, the test signal is not particularly limited. As an optional implementation, Figure 5 As shown, the step S220 of "providing a test signal to N target channels so that a mixer downstream of a power synthesizer of the phased array system outputs an overall DC offset signal and outputs a voltage amplitude of the overall DC offset signal" may include:

[0126] In step S221a, a single tone signal used as a test signal is transmitted using a transmitting antenna of a single channel used for calibration;

[0127] In step S222a, N receiving channels are opened, and the parameter output by the analog-to-digital converter ADC downstream of the mixer is used as the voltage amplitude of the overall DC offset signal.

[0128] Combine the following Figure 5 and Figure 6 The calibration method of the receiving channel is further described in detail.

[0129] In step S211a, all receiving channels are opened without adding external input to the phased array system.

[0130] In step S212a, the voltage amplitude of the DC offset signal measured at the ADC output terminal is recorded. The DC offset signal is the system DC offset signal. In order to distinguish it from the calibration of the transmission channel below, the system DC offset parameter is recorded as V dc intRXThe DC offset corresponding to this DC offset parameter is the sum of the DC offsets generated by all devices after the mixer until the ADC.

[0131] In step S221a, a single-channel transmitting antenna for calibration is used to transmit a single-tone signal, and receiving channels RX1, RX2, RX3, ..., RX4, RX5, RX6, RX7, RX8, RX9, RX10, RX11, RX12, RX13, RX14, RX15, RX16, RX17, RX18, RX19, RX20, RX21, N The single tone signals with equal amplitude and phase are received respectively. After being amplified in each channel, they are finally superimposed at the power synthesizer. Since different receiving channels have different initial phases, the final superimposed signal can be expressed by the above formula (5):

[0132]

[0133] Formula (5) shows that the signal at the power combiner position is the superposition of the signal received by the receiving channel after channel amplification and initial phase adjustment.

[0134] The signal generated by the mixer can be expressed by the formula (6) above:

[0135]

[0136]

[0137] Formula (6) shows that based on the mixing principle of the previous formula (2), the mixing of the power synthesizer output and the local oscillator signal of the mixer is the multiplication of multiple cosine signals and the local oscillator signal.

[0138] The voltage amplitude V of the remaining DC offset signal after the high-frequency signal is filtered out by the low-pass filter dc intRX The expression of formula (7) is as follows:

[0139]

[0140] The above formula shows that if the frequency of the received signal is the same as the frequency of the local oscillator signal, and the difference frequency signal is left after filtering out the sum frequency signal, the difference frequency signal is a DC quantity in this case, and this DC quantity reaches the maximum value when the initial phase of all sinusoidal signals is the same as the initial phase of the local oscillator signal.

[0141] The DC offset signal generated after mixing by the mixer will be superimposed on the initial DC offset of the system. At this time, the DC offset measured at the ADC output is recorded as Since the DC offset generated by the mixing itself needs to be subtracted from the initial DC offset of the system,

[0142] In step S230, Set as optimization target, adjust receiving channels RX1, RX2, RX3, ..., RX n The phase of the receiver can be adjusted by adjusting the phase shifter module in the receiving channel until the target is optimized. Reached maximum value. The condition for reaching the maximum value is shown in formula (8):

[0143]

[0144] Formula (8) shows that the condition for the DC quantity generated by mixing to reach the maximum value is that the initial phase of the receiving channel is the same as the initial phase of the local oscillator signal.

[0145] Therefore, the following relationship exists That is to say, the phase calibration of each receiving channel of the phased array system is realized to ensure that the initial phase of each receiving channel is the same.

[0146] In step 240, the initial phase of each target channel is adjusted to a corresponding target initial phase.

[0147] Specifically, when the target channel is a transmitting channel:

[0148] like Figure 7 As shown in , step S210 includes:

[0149] In step S211b, a receiving channel for calibration is opened;

[0150] In step S212b, an output value of an analog-to-digital converter ADC of the phased array system is used as a voltage amplitude of a DC offset signal of the system.

[0151] In the present disclosure, there is no particular limitation on how to provide the test signal. Optionally, a single tone signal is transmitted as the test signal using a multi-channel transmitting antenna. Specifically, Figure 7 As shown in , the step S220 of "providing test signals to N target channels so as to output an overall DC offset signal at a mixer downstream of a power synthesizer of the phased array system, and outputting a voltage amplitude of the overall DC offset signal" is performed as follows:

[0152] In step S221b, a single tone signal used as the test signal is transmitted using a multi-channel transmitting antenna;

[0153] In step S222b, the receiving channel for calibration is opened, and the parameter output by the ADC downstream of the mixer is used as the voltage amplitude of the overall DC offset signal.

[0154] Combine the following Figure 7 and Figure 8 The calibration method of the transmission channel is further described in detail.

[0155] In step S211b, when no external input is added to the receiving channel for calibration, the channel is opened;

[0156] In step S212b, the voltage amplitude of the DC offset signal corresponding to the DC offset measured by the ADC output at this time is recorded as This DC offset signal is the voltage amplitude of the sum of the DC offset signals generated by all devices after the mixer to the ADC. This is the system DC offset signal used to calibrate the DC offset of the receiving channel.

[0157] In step S221b, a single-tone signal is transmitted using a transmitting antenna of a phased array channel.

[0158] In step S222b, since different channels have different initial phases, the signal finally superimposed at the mixer input end of the receiving channel used for calibration is:

[0159]

[0160] The above formula shows that the signal before the mixer of the receiving channel used for calibration is the superposition of the signals of each transmitting channel to be calibrated, and these superposed signals may have different amplitudes and initial phases, but the frequencies are consistent.

[0161] The signal generated by the mixer is

[0162]

[0163] The above formula shows that based on the mixing principle of the previous formula (2), the mixing of the mixer input of the receiving channel used for calibration and the local oscillator signal of the mixer is the multiplication of multiple sinusoidal signals and the local oscillator signal.

[0164] After the high frequency signal is filtered out by the low-pass filter, the remaining DC offset value is:

[0165]

[0166] The above formula shows that if the frequency of the transmission signal is the same as the frequency of the local oscillator signal of the receiving channel used for calibration, and the receiving channel used for calibration filters out the difference frequency signal remaining after the sum frequency signal is removed, the difference frequency signal is a DC quantity in this case, and the DC quantity reaches the maximum value when the initial phases of all sinusoidal signals are the same as the initial phases of the local oscillator signal.

[0167] The DC offset signal generated after mixing by the mixer will be superimposed on the initial DC offset of the system. At this time, the voltage amplitude of the DC offset signal measured at the ADC output is recorded as Since the voltage amplitude of the DC offset signal generated by the mixing needs to be subtracted from the voltage amplitude of the initial DC offset signal of the system,

[0168] In step S230, Set as optimization target, adjust the transmission channel TX1, transmission channel TX2, transmission channel TX3, ..., transmission channel TX N The phase of the transmission channel can be adjusted to achieve the optimal phase. Reached maximum value. The condition for reaching the maximum value is

[0169]

[0170] Formula (9) shows that the condition for the DC quantity generated by mixing to reach the maximum value is that the initial phase of the receiving channel is the same as the initial phase of the local oscillator signal.

[0171] Therefore, the following relationship exists That is to say, the phase calibration of each transmitting channel of the phased array system is realized to ensure that the initial phase of each transmitting channel is the same.

[0172] In step S240, the initial phase of each target channel is adjusted to the target initial phase.

[0173] The phase calibration method provided by the present disclosure is described below by taking the number of channels N being 2 as an example.

[0174] Combine the following Figure 5 and Fig. 9 The phase calibration method of the receiving channel is described in detail.

[0175] In step S211a, all receiving channels are opened without adding external input to the dual-channel phased array system;

[0176] In step S212a, the voltage amplitude of the DC offset signal measured by the ADC output at this time is recorded as This DC offset signal is the sum of the DC offsets generated by all devices after the mixer and in the middle of the ADC. This is the initial value of the system DC offset signal.

[0177] In step S221a, a single-channel transmitting antenna for calibration is used to transmit a single-tone signal, and the receiving channels RX1 and RX2 of the phased array dual-channel system receive single-tone signals of equal amplitude and phase respectively. After amplification of each channel, they are finally superimposed at the power synthesizer. Since different channels have different initial phases, the final superimposed signal is shown in the following formula:

[0178]

[0179] The above formula shows that the signal at the power combiner position is the superposition of the signal received by the receiving channel after channel amplification and initial phase adjustment.

[0180] The signal generated by the mixer is shown in the following formula:

[0181]

[0182] The above formula shows that based on the mixing principle of the previous formula (2), the mixing of the power synthesizer output and the local oscillator signal of the mixer is the multiplication of two sinusoidal signals and the local oscillator signal.

[0183] After the high frequency signal is filtered out by the low-pass filter, the remaining DC offset is

[0184]

[0185] The above formula shows that if the frequency of the received signal is the same as the frequency of the local oscillator signal, and the difference frequency signal is filtered out, the difference frequency signal is a DC quantity in this case, and this DC quantity reaches the maximum value when the initial phases of the two sinusoidal signals are the same as the initial phases of the local oscillator signal.

[0186] The DC offset signal generated after mixing by the mixer will be superimposed on the initial DC offset of the system. At this time, the voltage amplitude of the DC offset signal measured at the ADC output is recorded as Since the voltage amplitude of the DC offset signal generated by the mixing itself needs to be subtracted from the voltage amplitude of the system's initial DC offset signal,

[0187] In step S230, Set as the optimization target, adjust the phase of the receiving channels RX1 and RX2 respectively (the specific implementation can be to adjust the phase shifter module in the receiving channel) until the optimization target is reached. Reached maximum value. The condition for reaching the maximum value is

[0188]

[0189] Formula (10) shows that the condition for the DC quantity generated by mixing to reach the maximum value is that the initial phases of the two receiving channels are the same as the initial phase of the local oscillator signal.

[0190] Therefore, the following relationship exists That is to say, the phase calibration of each receiving channel of the phased array dual-channel system is realized to ensure that the initial phase of each receiving channel is the same.

[0191] In step S240 , the initial phases of the two receiving channels are adjusted to the phases determined in step S230 .

[0192] Combine the following Figure 7 and Fig.10 The phase calibration method of the receiving channel is described in detail.

[0193] In step S211b, when the receiving channel system for calibration is not inputted externally, the channel is opened and the voltage amplitude of the DC offset signal measured by the ADC output is recorded as This DC offset signal is the sum of the DC offset signals generated by all devices after the mixer and in the middle of the ADC. This is the voltage amplitude of the system DC offset signal used to calibrate the DC offset of the receiving channel.

[0194] In step S211b, a dual-channel transmitting antenna is used to transmit a single-tone signal. Since different channels have different initial phases, the signal finally superimposed at the mixer input end of the receiving channel used for calibration is:

[0195]

[0196] The above formula shows that the signal before the mixer of the receiving channel used for calibration is the superposition of the two transmitting channel signals to be calibrated, and the two superposed signals may have different amplitudes and initial phases, but the frequencies are consistent.

[0197] The signal generated by the mixer is

[0198]

[0199] The above formula shows that based on the mixing principle of the previous formula (2), the mixing of the mixer input of the receiving channel used for calibration and the local oscillator signal of the mixer is the multiplication of two cosine signals and the local oscillator signal.

[0200] After the high frequency signal is filtered out by the low-pass filter, the remaining DC offset value is:

[0201]

[0202] The above formula shows that if the frequencies of the two transmitted signals are the same as the frequency of the local oscillator signal of the receiving channel used for calibration, and the receiving channel used for calibration filters out the difference frequency signal remaining after the sum frequency signal is removed, the difference frequency signal is a DC quantity in this case, and the DC quantity reaches the maximum value when the initial phases of the two sinusoidal signals are the same as the initial phases of the local oscillator signal.

[0203] The DC offset signal generated after mixing by the mixer will be superimposed on the initial DC offset signal of the system. At this time, the voltage amplitude of the DC offset signal measured at the ADC output is recorded as Since the DC offset generated by the mixing needs to be subtracted from the initial DC offset of the system,

[0204] In step S230, Set as the optimization target, adjust the phase of the transmit channels TX1 and TX2 respectively (the specific implementation can be to adjust the phase shifter module in the transmit channel) until the optimization target is reached. Reached maximum value. The condition for reaching the maximum value is

[0205]

[0206] Formula (10) shows that the condition for the DC quantity generated by mixing to reach the maximum value is that the initial phases of the two receiving channels are the same as the initial phase of the local oscillator signal.

[0207] Therefore, the following relationship exists That is to say, the phase calibration of each transmitting channel of the phased array system is realized to ensure that the initial phase of each transmitting channel is the same.

[0208] In step S240 , the initial phases of the two transmit channels are adjusted to the phases determined in step S230 .

[0209] As a third aspect of the present disclosure, a target initial phase determination device is provided, comprising:

[0210] A storage module on which an executable program is stored;

[0211] One or more processors, wherein the one or more processors call the executable program to implement the initial phase determination method provided in the first aspect of the present disclosure.

[0212] The display terminal target initial phase determination device also includes a first I / O interface (read-write interface), which is connected between the first processor and the first storage module to achieve information interaction between the first processor and the first storage module.

[0213] A processor is a device with data processing capabilities, including but not limited to a central processing unit (CPU); a storage module is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH).

[0214] The I / O interface is connected between the processor and the storage module, and can realize information exchange between the processor and the storage module, which includes but is not limited to a data bus (Bus) and the like.

[0215] In some embodiments, the processor, the storage module, and the I / O interface are connected to each other through a bus, and further connected to other components of the display terminal.

[0216] As a fourth aspect of the present disclosure, a computer-readable storage medium is provided, on which an executable program is stored, and when the executable program is called, the initial phase determination method described in the first aspect of the present disclosure can be implemented.

[0217] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0218] As a fifth aspect of the present disclosure, an antenna device is provided, including:

[0219] Phased array systems; and

[0220] The above-mentioned target initial phase determination device provided by the present disclosure.

[0221] The target initial phase determination device can improve the phase calibration accuracy of each channel in the phased array system, thereby improving the beamforming performance of the antenna device.

[0222] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for determining an initial phase of a target, comprising: Acquire voltage amplitudes of system DC offset signals of the phased array system corresponding to the N target channels to be calibrated; Respectively acquiring voltage amplitudes of the overall DC offset signal at different initial phases, wherein for any initial phase, the overall DC offset signal is an overall DC offset signal of an initial mixing signal output by a mixer downstream of a power synthesizer of the phased array system after providing a test signal to N target channels; Calculate the voltage amplitudes of the mixed DC offset signals of the N target channels under different initial phase conditions, and use the initial phases of the N target channels when the voltage amplitude of the mixed DC offset signal reaches a maximum value as the target initial phases of the N target channels; wherein the voltage amplitude of the mixed DC offset signal is calculated using the following formula: in, is the voltage amplitude of the initial DC offset signal; is the voltage amplitude of the initial mixing signal; is the voltage amplitude of the mixing DC offset signal; N is the number of channels of the phased array system.

2. The target initial phase determination method according to claim 1, wherein: The target channel is a receiving channel. In the step of obtaining the voltage amplitude of the system DC offset signal of the phased array system corresponding to the N target channels to be calibrated, the voltage amplitude of the system DC offset signal is a parameter output by the analog-to-digital converter ADC downstream of the mixer after the N receiving channels are opened.

3. The target initial phase determination method according to claim 2, wherein: The test signal provided to the N target channels is a single tone signal transmitted by the transmitting antenna of a single channel used for calibration. In the step of respectively acquiring the voltage amplitude of the overall DC offset signal at different initial phases, the voltage amplitude of the overall DC offset signal is a parameter output by the ADC after N receiving channels are opened.

4. The method for determining the target initial phase according to claim 1, wherein: The target channel is a transmitting channel. In the step of obtaining the voltage amplitude of the system DC offset signal of the phased array system corresponding to the N target channels to be calibrated, the voltage amplitude of the system DC offset signal is a parameter output by the analog-to-digital converter ADC downstream of the mixer after the receiving channel for calibration is opened.

5. The method for determining the target initial phase according to claim 4, wherein: The test signal provided to the N target channels is a single tone signal transmitted by the multi-channel transmitting antenna of the phased array channel. In the step of respectively acquiring the voltage amplitude of the overall DC offset signal at different initial phases, the voltage amplitude of the overall DC offset signal is a parameter output by the ADC after the receiving channel for calibration is opened.

6. A phase calibration method, comprising: Generate a system DC offset signal of the phased array system corresponding to the N target channels to be calibrated, and output a system DC offset parameter; Adjusting the initial phases of the N target channels, adjusting the initial phases of the N target channels to a phase value each time, providing a test signal to the N target channels, so that a mixer downstream of a power synthesizer of the phased array system outputs an overall DC offset signal, and outputs a voltage amplitude of the overall DC offset signal; Determine the target initial phases of N target channels using the target initial phase determination method described in any one of claims 1 to 5; The initial phase of each target channel is adjusted to the target initial phase respectively.

7. The phase calibration method according to claim 6, wherein: The target channel is a receiving channel, and the steps of generating a system DC offset signal of a phased array system corresponding to the N target channels to be calibrated and outputting a system DC offset parameter include: Opening N receiving channels; The output value of the analog-to-digital converter ADC of the phased array system is used as the voltage amplitude of the direct current offset signal of the system.

8. The phase calibration method according to claim 7, wherein: The step of providing a test signal to the N target channels so that a mixer downstream of a power combiner of the phased array system outputs an overall DC offset signal and generating a voltage amplitude of the overall DC offset signal comprises: Transmitting a single tone signal used as a test signal using a transmitting antenna of a single channel for calibration; N receiving channels are opened, and the parameter output by the ADC is used as the voltage amplitude of the overall DC offset signal.

9. The phase calibration method according to claim 6, wherein: The target channel is a transmitting channel, and the steps of generating a system DC offset signal of a phased array system and outputting a system DC offset parameter include: Open the receiving channel for calibration; The output value of the analog-to-digital converter ADC of the phased array system is used as the voltage amplitude of the direct current offset signal of the system.

10. The phase calibration method according to claim 9, wherein: The step of providing a test signal to the N target channels so that a mixer downstream of a power combiner of the phased array system outputs an overall DC offset signal and generating a voltage amplitude of the overall DC offset signal comprises: Transmitting a single tone signal used as the test signal using a multi-channel transmitting antenna; The receiving channel for calibration is opened, and the parameter of the ADC output downstream of the mixer is used as the voltage amplitude of the overall DC offset signal.

11. A target initial phase determination device, comprising: A storage module on which an executable program is stored; One or more processors, wherein the one or more processors call the executable program to implement the target initial phase determination method described in any one of claims 1 to 5.

12. A computer-readable storage medium having an executable program stored thereon, which can implement the target initial phase determination method described in any one of claims 1 to 5 when the executable program is called.

13. An antenna device, comprising: Phased array systems; and The target initial phase determination device as claimed in claim 11.

Images