A multi-channel radio frequency signal phase difference control system and method

Abstract

The application provides a multi-channel radio frequency signal phase difference control system and method. The system comprises multiple radio frequency signal generation circuits to generate a reference radio frequency signal and multiple to-be-adjusted radio frequency signals. A radio frequency phase detection link comprises a radio frequency gating switch and a first mixer. The radio frequency gating switch is used to select one to-be-adjusted radio frequency signal to input into the first mixer. The first mixer is used to mix the reference radio frequency signal and the selected to-be-adjusted radio frequency signal to output a mixed radio frequency signal to a phase difference adjustment circuit. A low-pass filter is used to filter the mixed radio frequency signal to output a filtered signal to an analog-to-digital converter. The analog-to-digital converter is used to convert the filtered signal into a digital signal and output the digital signal to a control unit. The control unit is used to adjust the phase of the radio frequency signal generation circuit based on the digital signal to adjust the phase difference between the reference radio frequency signal and the to-be-adjusted radio frequency signal. The application reduces the number of high-cost components, simplifies circuit debugging, is flexible in control, and is suitable for various temperature environments.

Description

Technical Field

[0001] This application relates to the field of radio frequency signal processing technology, and in particular to a multi-channel radio frequency signal phase difference control system and method. Background Technology

[0002] Radio frequency (RF) signals are obtained through frequency mixing and are widely used in wireless communication, multiple-input multiple-output (MIMO) radar, and phased array radar (PAR). The phase coherence of the multi-channel signals is a crucial technical indicator affecting radar system performance. In practical engineering applications, factors such as signal transmission paths, changes in external ambient temperature, and individual differences between connected RF loops can all influence the phase of the RF signal.

[0003] In related technologies, circuits and methods for phase shift compensation through hardware design such as delay lines, RC networks, voltage control, and waveguide mechanical phase shifting require specialized component manufacturers. These technologies have high barriers to entry, small controllable and adjustable ranges, narrow bandwidths, dispersion, large errors and poor accuracy, are unsuitable for broadband frequency hopping sources, and are difficult to compensate for phase drift when the ambient temperature changes. Summary of the Invention

[0004] This invention provides a multi-channel radio frequency signal phase difference control system and method to solve the technical problems of complex phase coherence adjustment, limited adjustment effect and application environment of the above-mentioned multi-channel radio frequency signals.

[0005] In one embodiment of this application, a multi-channel radio frequency (RF) signal phase difference control system is provided, comprising: an RF phase detection link, a phase difference adjustment circuit, a control unit, and an RF signal generation circuit; the RF signal generation circuit comprises multiple circuits to generate one reference RF signal and multiple RF signals to be phase-modulated; the RF phase detection link comprises an RF gating switch and a first mixer, the RF gating switch being used to select one RF signal to be phase-modulated and input it to the first mixer, the first mixer being used to mix the reference RF signal and the selected RF signal to be phase-modulated, and outputting the mixed RF signal to the phase difference adjustment circuit; the phase difference adjustment circuit comprises a low-pass filter and an analog-to-digital converter, the low-pass filter being used to filter the mixed RF signal and outputting a filtered signal to the analog-to-digital converter, the analog-to-digital converter being used to convert the filtered signal into a digital signal and output it to the control unit; the control unit is used to perform phase adjustment on the RF signal generation circuit based on the digital signal to adjust the phase difference between the reference RF signal and the RF signals to be phase-modulated.

[0006] In one embodiment of this application, the RF phase detection link further includes a first RF amplifier, a second RF amplifier, and multiple resistors; the phase adjustment circuit further includes an operational amplifier; the reference RF signal is weakly coupled to the second RF amplifier through a resistor; the RF gating switch includes multiple input terminals, and each RF signal to be phased is weakly coupled to a corresponding input terminal of the RF gating switch through a resistor; the input terminal of the first RF amplifier is connected to the output terminal of the RF gating switch, the output terminal of the first RF amplifier is connected to the first input terminal of the first mixer, and the output terminal of the second RF amplifier is connected to the second input terminal of the first mixer; the output terminal of the first mixer is connected to the input terminal of the low-pass filter, the output terminal of the low-pass filter is connected to the input terminal of the operational amplifier, the output terminal of the operational amplifier is connected to the input terminal of the analog-to-digital converter, and the output terminal of the analog-to-digital converter is connected to the input terminal of the control unit; the output terminal of the control unit is connected to each intermediate frequency signal generation unit used to generate the RF signal to be phased.

[0007] In one embodiment of this application, the multi-channel radio frequency signal phase difference control system further includes at least one of the following:

[0008] The low-pass filter is used to filter out the radio frequency components after mixing; the radio frequency gating switch includes an absorptive radio frequency switch; the radio frequency amplifier includes a broadband radio frequency amplifier; the first mixer includes a high-level double-balanced mixer; the operational amplifier includes a rail-to-rail single-supply operational amplifier; the analog-to-digital converter has a conversion bit depth of more than ten bits.

[0009] In one embodiment of this application, the radio frequency signal generation circuit includes a local oscillator signal generation unit, an intermediate frequency signal generation unit, a second mixer, and a filter amplifier circuit; the first input terminal of the second mixer is connected to the output terminal of the local oscillator signal generation unit, the second input terminal of the second mixer is connected to the output terminal of the intermediate frequency signal generation unit, the output terminal of the second mixer is connected to the input terminal of the filter amplifier circuit, and the reference radio frequency signal or the radio frequency signal to be phase-modulated is output through the filter amplifier circuit.

[0010] In one embodiment of this application, the multi-channel radio frequency signal phase difference control system further includes a reference frequency generation unit; the reference frequency generation unit includes a reference frequency generation unit, a power divider, a frequency production module, a frequency divider, a first filtering amplification power divider unit, and a second filtering amplification power divider unit; the reference frequency generation unit is connected to the input terminal of the power divider, the first output terminal of the power divider is connected to the input terminal of the frequency production module, the second output terminal of the power divider is connected to the input terminal of the frequency divider, and the first output terminal of the frequency production module is connected to the input terminal of the first filtering amplification power divider unit. The second output terminal of the frequency generation module is connected to the control unit, and the input terminal of the second filtering amplification power divider is connected to the output terminal of the frequency divider. The first filtering amplification power divider includes multiple power divider output terminals to output multiple intermediate frequency reference clock signals, and one power divider output terminal of the first filtering amplification power divider is connected to the input terminal of the intermediate frequency signal generation unit. The second filtering amplification power divider includes multiple power divider output terminals to output multiple local oscillator reference clock signals, and one power divider output terminal of the second filtering amplification power divider is connected to the input terminal of the local oscillator signal generation unit.

[0011] In one embodiment of this application, a multi-channel radio frequency signal phase difference control method is provided, comprising: acquiring a mixing output voltage, wherein the mixing output voltage is obtained by mixing and filtering a parent radio frequency signal and a copy radio frequency signal, the copy radio frequency signal being selected from multiple radio frequency signals to be modulated through a radio frequency gating circuit, and the parent radio frequency signal being obtained based on a reference radio frequency signal; adjusting the pre-mixing phase difference between the parent radio frequency signal and the copy radio frequency signal, and determining the quadrant in which the pre-mixing phase difference is located based on the changing trend of the mixing output voltage; performing initial adjustment on the current phase of the copy radio frequency signal based on the adjusted mixing output voltage and the quadrant in which the pre-mixing phase difference is located, so that the parent radio frequency signal and the copy radio frequency signal are in phase before mixing; measuring the pre-mixing phase detection insertion difference, and performing phase difference compensation on the pre-adjusted current phase based on the phase detection insertion difference, so that the reference radio frequency signal and the corresponding radio frequency signal to be modulated are in phase.

[0012] In one embodiment of this application, adjusting the pre-mixing phase difference between the parent RF signal and the copy RF signal, and determining the quadrant where the pre-mixing phase difference is located based on the changing trend of the mixing output voltage, includes: the mixing output voltage being obtained based on filtering out the RF components after mixing using a low-pass filter; increasing or decreasing the initial phase of the copy RF signal to obtain the adjusted mixing output voltage; and determining the quadrant where the pre-mixing phase difference is located based on the direction of adjustment of the initial phase and the direction of change between the mixing output voltage and the adjusted mixing output voltage.

[0013] In one embodiment of this application, the current phase of the replica radio frequency signal is initially adjusted based on the adjusted mixing output voltage and the quadrant in which the pre-mixing phase difference is located, including: determining the pre-mixing phase difference value based on the adjusted mixing output voltage and the quadrant in which the pre-mixing phase difference is located; adjusting the intermediate frequency phase of the intermediate frequency signal based on the pre-mixing phase difference value; wherein the intermediate frequency signal is used to generate the replica radio frequency signal.

[0014] In one embodiment of this application, measuring the phase insertion difference before mixing and compensating for the phase difference of the current phase after initial modulation based on the phase insertion difference includes: measuring the phase insertion difference at the RF signal output terminal using an oscilloscope, wherein the RF signal output terminal is used to characterize the output terminal of the RF signal to be modulated and the reference RF signal; and subtracting the phase insertion difference from the intermediate frequency phase after initial modulation to perform phase difference compensation.

[0015] In one embodiment of this application, after the reference RF signal and the copy RF signal are in phase, the phase difference value before mixing, the current phase after initial adjustment, and the phase difference compensation value corresponding to each phase-to-be-modulated RF signal are converted into phase control words and stored to obtain a phase control mapping relationship, so that each phase-to-be-modulated RF signal is in phase with the reference RF signal, and the phase difference compensation value is obtained based on the phase difference insertion of the phase detector; and / or, the RF signal parameters are adjusted based on the obtained channel adjustment requirements, the channel adjustment requirements including at least one of the independent frequency hopping requirements of multiple channel RF signals and the co-frequency co-coordinated frequency hopping requirements of multiple channel RF signals.

[0016] The beneficial effects of the embodiments of the present invention are as follows: The present invention provides a multi-channel radio frequency signal phase difference control system and method. The embodiments of the present invention perform phase detection through radio frequency gating switches and a first mixer, and adjust the phase difference between the reference radio frequency signal and the radio frequency signal to be phased through a low-pass filter and an analog-to-digital converter. This effectively reduces the number of high-cost components, simplifies circuit debugging, lowers the threshold for implementing arbitrarily expanded multi-channel products, and provides flexible control. Phase difference adjustment can be started at any time under different temperature conditions to achieve the purpose of calibrating the phase difference index and stabilizing the output.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0019] Figure 1 A schematic diagram of an exemplary system architecture to which the technical solutions of the embodiments of this application can be applied is shown;

[0020] Figure 2 A flowchart illustrating a multi-channel radio frequency signal phase difference control method according to an embodiment of this application is shown;

[0021] Figure 3 The following is a waveform simulation diagram illustrating the startup delay difference of multiple DDS and frequency divider according to an embodiment of this application;

[0022] Figure 4 A schematic diagram illustrating the quadrant determination principle according to an embodiment of this application is shown;

[0023] Figure 5 A schematic diagram of an oscilloscope phase difference test according to an embodiment of this application is shown;

[0024] Figure 6 A schematic diagram illustrating an embodiment of a multi-channel radio frequency signal phase difference control method according to this application is shown.

[0025] Figure 7 A schematic diagram of the structure of a computer system suitable for implementing the electronic device of the present application is shown. Detailed Implementation

[0026] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0027] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0028] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present application. However, it will be apparent to those skilled in the art that embodiments of the present application may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present application.

[0029] Please see Figure 1 , Figure 1 A schematic diagram of an exemplary system architecture to which the technical solutions of the embodiments of this application can be applied is shown. For example... Figure 1 As shown, the system architecture may include an RF phase detection link, a phase difference adjustment circuit, a control unit, and an RF signal generation circuit; there are multiple RF signal generation circuits to generate one reference RF signal f. RF1 and multiple radio frequency signals to be modulated f RF2～n The radio frequency (RF) phase detection link includes an RF gating switch Z1 and a first mixer U1. The RF gating switch Z1 is used to select one RF signal to be modulated and input it to the first mixer U1. The first mixer U1 is used to mix the reference RF signal and the selected RF signal to be modulated, and outputs the mixed RF signal to the phase difference adjustment circuit. The phase difference adjustment circuit includes a low-pass filter Z2 and an analog-to-digital converter D1. The low-pass filter Z2 is used to filter the mixed RF signal and outputs the filtered signal to the analog-to-digital converter D1. The analog-to-digital converter is used to convert the filtered signal into a digital signal and output it to the control unit. The control unit is used to perform phase adjustment on the RF signal generation circuit based on the digital signal to adjust the phase difference between the reference RF signal and the RF signal to be modulated.

[0030] In one embodiment of this application, the reference radio frequency signal f RF1 and multiple radio frequency signals to be modulated f RF2～n Collectively referred to as multi-channel radio frequency output signal f RF1～n .

[0031] In one embodiment of this application, the radio frequency gating switch Z1 includes a radio frequency N-to-1 switch, where N is the number of radio frequency channels. M N / M-to-1 switches are connected in parallel or combined to reduce the width and facilitate expansion.

[0032] In one embodiment of this application, the control unit comprises components such as a memory, a field-programmable gate array (FPGA) circuit, and a microcontroller.

[0033] In one embodiment of this application, the analog-to-digital converter (ADC) D1 is selected as an ADC with more than 10 bits.

[0034] In one embodiment of this application, the RF phase detection link further includes a first RF amplifier, a second RF amplifier, and multiple resistors; the phase difference adjustment circuit further includes an operational amplifier; a reference RF signal is weakly coupled to the second RF amplifier through a resistor; the RF gating switch includes multiple input terminals, and each RF signal to be phased is weakly coupled to a corresponding input terminal of the RF gating switch through a resistor; the input terminal of the first RF amplifier is connected to the output terminal of the RF gating switch, the output terminal of the first RF amplifier is connected to the first input terminal of the first mixer, and the output terminal of the second RF amplifier is connected to the second input terminal of the first mixer; the output terminal of the first mixer is connected to the input terminal of the low-pass filter, the output terminal of the low-pass filter is connected to the input terminal of the operational amplifier, the output terminal of the operational amplifier is connected to the input terminal of the analog-to-digital converter, and the output terminal of the analog-to-digital converter is connected to the input terminal of the control unit; the output terminal of the control unit is connected to each intermediate frequency signal generation unit used to generate the RF signal to be phased.

[0035] In one embodiment of this application, please refer to [the relevant documentation]. Figure 1 ,like Figure 1 As shown, the RF phase detection link also includes a first RF amplifier N1, a second RF amplifier N2, and multiple resistors R1 to n. The phase difference adjustment circuit also includes an operational amplifier N3. The RF output signals f from the second to the nth channels... RF2～n Each of the first channel's RF output signals is weakly coupled to the RF N-to-1 switch Z1 via resistors R2 to Rn; RF1 Weakly coupled to the first mixer U1 through resistor R1.

[0036] In one embodiment of this application, please refer to [the relevant documentation]. Figure 1 ,like Figure 1 As shown, the coupled RF signals obtained through weak coupling via resistors R2 to Rn are connected to the RF N-to-1 switch Z1. Z1 is controlled by the control unit to only turn on the RF output signal f. RF2～n In either path, the replica RF signal is amplified by the first RF amplifier N1 and output to the first mixer U1. The coupled RF signal, weakly coupled through resistor R1, is amplified by the second RF amplifier N2 to obtain the parent RF signal, which is also output to the first mixer U1. The first mixer U1 performs phase detection on the parent and replica RF signals to obtain the phase detection voltage V. F1 This is the mixed radio frequency signal, which is then output to a low-pass filter Z2. The low-pass filter Z2 filters the phase detection voltage signal to obtain a filtered signal, which is then output to an operational amplifier N3. After amplifying the filtered signal, an amplified voltage V is output. F2 The signal is then output to the analog-to-digital converter D1 for sampling. The analog-to-digital converter converts the amplified voltage in analog signal format into a digital signal and outputs it to the control unit.

[0037] In one embodiment of this application, the control unit identifies the input digital signal and outputs a control signal to control the phase of the radio frequency N-to-1 switch Z1 and the corresponding intermediate frequency signal in the intermediate frequency signal generation unit.

[0038] In one embodiment of this application, the multi-channel RF signal phase difference control system further includes at least one of the following: a low-pass filter for filtering out RF components after mixing; an RF gating switch including an absorptive RF switch; an RF amplifier including a broadband RF amplifier; a first mixer including a high-level double-balanced mixer; an operational amplifier including a rail-to-rail single-supply operational amplifier; and an analog-to-digital converter including more than ten bits.

[0039] In one embodiment of this application, the low-pass filter Z2 selects a cutoff frequency capable of filtering out the radio frequency output signal f. RF1～n Low-pass filters for harmonics.

[0040] In one embodiment of this application, the radio frequency signal generation circuit includes a local oscillator signal generation unit, an intermediate frequency signal generation unit, a second mixer, and a filter amplifier circuit; the first input terminal of the second mixer is connected to the output terminal of the local oscillator signal generation unit, the second input terminal of the second mixer is connected to the output terminal of the intermediate frequency signal generation unit, and the output terminal of the second mixer is connected to the input terminal of the filter amplifier circuit; the reference radio frequency signal or the radio frequency signal to be phase-modulated is output through the filter amplifier circuit.

[0041] In one embodiment of this application, please refer to [the relevant documentation]. Figure 1 ,like Figure 1 As shown, for example, generating f for the first channel RF1 The radio frequency signal generation circuit includes a first and a second mixer U21, a local oscillator signal generation unit 1, an intermediate frequency signal generation unit 1, and a filter and amplifier circuit; it generates the f signal of the nth channel. RFn The radio frequency signal generation circuit includes the nth second mixer U2n, the local oscillator signal generation unit n, the intermediate frequency signal generation unit n, and the filter and amplifier circuit.

[0042] In one embodiment of this application, the radio frequency (RF) signal generation circuit includes a local oscillator (LO) signal generation unit, an intermediate frequency (IF) signal generation unit, and an RF signal generation unit. The RF signal generation unit includes a second mixer and a filtering and amplification circuit.

[0043] In one embodiment of this application, multiple local oscillator signals (f LO Under the control of the control unit, the generation unit outputs n local oscillator signals f LO1～n These signals are then input to the corresponding radio frequency signal generation units to generate the corresponding radio frequency output signals.

[0044] In one embodiment of this application, each local oscillator signal generation unit has the same circuit structure. The circuit structure of the local oscillator signal generation unit includes an integer frequency division phase-locked loop and its peripheral circuits. The bandwidth can be extended by a high-bandwidth voltage-controlled oscillator (VCO) and frequency divider, etc.

[0045] In one embodiment of this application, multiple intermediate frequency signals (f IF Under the control of the control unit, the generation unit outputs n intermediate frequency signals f IF1～n These signals are then input to the corresponding radio frequency signal generation unit sequences to generate the corresponding radio frequency output signals.

[0046] In one embodiment of this application, each intermediate frequency (IF) signal generation unit has the same circuit structure, which includes a direct digital synthesizer (DDS) and its peripheral circuits.

[0047] In one embodiment of this application, multiple radio frequency signals (f RF The unit sequence generated by m = p*q frequency hopping points is processed by mixers U21 to U2n to process the input large-step local oscillator signal (f). LO (P points) and small-step intermediate frequency signal (f IF The frequency is mixed at q points, filtered and amplified, and then directly output.

[0048] In one embodiment of this application, the control unit can also control each local oscillator signal f in each local oscillator signal generation unit according to an externally input control signal. LO1～n Synchronous frequency hopping, and the intermediate frequency signals f in each intermediate frequency signal generation unit. IF1～n The frequency and phase.

[0049] In one embodiment of this application, the multi-channel radio frequency signal phase difference control system further includes a reference frequency generation unit; the reference frequency generation unit includes a reference frequency generation unit, a power divider, a frequency generation module, a frequency divider, a first filtering amplification power divider unit, and a second filtering amplification power divider unit; the reference frequency generation unit is connected to the input terminal of the power divider, the first output terminal of the power divider is connected to the input terminal of the frequency generation module, the second output terminal of the power divider is connected to the input terminal of the frequency divider, the first output terminal of the frequency generation module is connected to the input terminal of the first filtering amplification power divider unit, the second output terminal of the frequency generation module is connected to the control unit, and the input terminal of the second filtering amplification power divider unit is connected to the output terminal of the frequency divider unit; the first filtering amplification power divider unit includes multiple power divider output terminals to output multiple intermediate frequency reference clock signals, and one power divider output terminal of the first filtering amplification power divider unit is connected to the input terminal of the intermediate frequency signal generation unit; the second filtering amplification power divider unit includes multiple power divider output terminals to output multiple local oscillator reference clock signals, and one power divider output terminal of the second filtering amplification power divider unit is connected to the input terminal of the local oscillator signal generation unit.

[0050] In one embodiment of this application, please refer to [the relevant documentation]. Figure 1 ,like Figure 1 As shown, the reference frequency generation unit outputs a 120MHz base reference signal in the multi-channel RF signal phase difference control system through a 120MHz oven-controlled crystal oscillator (OCXO). The base reference signal is divided into two paths by a power divider. One path is input to the frequency generation module to generate a frequency signal for outputting the intermediate frequency (IF) reference clock signal, such as a 1GHz frequency signal, and another path is used as a reference frequency signal for the control unit, such as a 40MHz frequency signal. The 1GHz frequency signal is filtered, amplified, and divided into n paths by the first filtering, amplifying, and power dividing unit, and then output to each IF signal generation unit as the input clock signal for the IF signal generation unit. The 40MHz frequency signal is output as the input clock signal for the control unit. The other power-divided base reference signal is divided by 2 to obtain a frequency signal for outputting the local oscillator (LO) reference clock signal, such as a 60MHz frequency signal. The 60MHz frequency signal is filtered, amplified, and divided into n paths by the second filtering, amplifying, and power dividing unit, and then output to each LO signal generation unit as the input frequency signal for the LO signal generation unit.

[0051] Please see Figure 2 , Figure 2 A schematic flowchart of a multi-channel radio frequency signal phase difference control method according to an embodiment of this application is shown. Figure 2 As shown, in an exemplary embodiment, the multi-channel radio frequency signal phase difference control method includes at least steps S210 to S240, which are described in detail below:

[0052] Step S210: Obtain the mixing output voltage.

[0053] The mixing output voltage is obtained by mixing and filtering the parent RF signal and the copy RF signal. The copy RF signal is selected from multiple phase-modulated RF signals through an RF gating circuit, and the parent RF signal is obtained based on a reference RF signal.

[0054] In one embodiment of this application, the mixing output voltage is used to characterize the voltage after sequential filtering, amplification, and analog-to-digital conversion following mixing.

[0055] In one embodiment of this application, the radio frequency output signal f RF1～n For intermediate frequency signal f IF1～n and local oscillator signal f LO1～n f is generated through mixing by multiple second mixers U21 to U2n. RFn =f LOn ±f IFn Only single-sideband filtering is selected.

[0056] In one embodiment of this application, the mixing equation between the local oscillator signal and the intermediate frequency signal is as follows:

[0057]

[0058] Among them, V R (t) represents the voltage output of the second mixer as a function of time t, A1 is the amplitude of the sum-frequency component, and ω L ω is the angular frequency of the local oscillator signal. I The angular frequency of the intermediate frequency signal. The local oscillator phase of the local oscillator signal. A1 represents the intermediate frequency phase of the intermediate frequency signal, and A2 represents the amplitude of the difference frequency component.

[0059] In one embodiment of this application, as shown in equation (1), it can be seen that the phase difference of the mixing output is linearly related to the phase difference of the mixing input. Therefore, the intermediate frequency signal f of each channel is adjusted. IF1～n initial phase Theoretically, this can realize the RF output signal f of each channel. RF1～n low phase difference between Because the phase parameters of various components in the intermediate frequency signal generation unit and the local oscillator signal generation unit of each channel have fluctuation ranges, the RF output signal f of each channel is generated. IF1～n The transmission paths differ, and the time shifts of the signals in each channel are different. Therefore, the RF output signal f RF1～n When outputting the same frequency, their initial phases are different, and the time shift between channels causes large phase shift differences.

[0060] In one embodiment of this application, please refer to [the relevant documentation]. Figure 1 ,like Figure 1 As shown, at the RF signal output terminal, the phase difference between the two RF output signals is as follows:

[0061]

[0062] in, Δθ represents the phase difference between the two RF output signals at the RF signal output terminal. 插入 The phase detection insertion difference, Δθ, is the phase difference of the RF phase detection link. PD This is the phase difference at the input of the first mixer, which is the phase difference before mixing, i.e., before RF mixing.

[0063] In one embodiment of this application, the first radio frequency output signal f RF1 The second RF output signal f serves as the reference signal for phase difference detection. RF2 up to the nth RF output signal f RFn All use the first radio frequency output signal f RF1 Phase shifting is performed for the reference signal; this is merely an example, and this application does not impose any limitation on the actual number of reference RF signals.

[0064] In one embodiment of this application, the application uses a first radio frequency output signal f RF1 The parent radio frequency signal is obtained, and the second radio frequency output signal f is obtained. RF2 The phase difference control is explained using the obtained copy of the radio frequency signal as an example.

[0065] In one embodiment of this application, all intermediate frequency signals f are controlled by a control unit. RF1～n The default initial phase at power-on frequency is 0°, which facilitates phase shifting. Please refer to [link / reference]. Figure 3 , Figure 3 A waveform simulation diagram illustrating the startup delay difference of multiple DDS and frequency divider according to an embodiment of this application is shown. Figure 3 As shown, differences in the Δt values ​​of random delays during startup were found between multiple channels' DDS or frequency dividers. The causes of these random delay differences include at least one of the following: channel signal clock differences, command arrival time differences at the DDS, command arrival time differences at the frequency divider, and blind spots in the switching comparison operation. These random delay differences affect the output RF signals of each channel. The power-on process is random each time it is powered on, and it cannot be determined solely by setting the initial phase to 0° or by reading the data using an oscilloscope. To make corrections, an RF phase detection link must be inserted, such as... Figure 1 As shown.

[0066] In one embodiment of this application, the radio frequency N-to-one switch Z1 is turned on, and the second radio frequency output signal f is amplified by the first radio frequency amplifier N1. RF2The copied RF signal is obtained and input to the first mixer U1. The first RF output signal f RF1 The signal is amplified by the second RF amplifier N2 to obtain the parent RF signal, which is then input to the first mixer U1.

[0067] In one embodiment of this application, the amplitudes of the copy radio frequency signal and the parent radio frequency signal are equal.

[0068] In one embodiment of this application, the first mixer U1 performs phase detection on the input master radio frequency signal and the replica radio frequency signal, and outputs a phase detection voltage V. F1 as follows:

[0069]

[0070] Among them, V F1 K1 is the phase detection voltage, and K2 is the amplitude of the low-frequency component. The initial phase of the parent radio frequency signal. K is the initial phase of the replica RF signal, K2 is the amplitude of the second harmonic component, ω is the angular frequency, and t is the time.

[0071] In one embodiment of this application, the phase detection voltage V is filtered out by a low-pass filter Z2. F1 The radio frequency component in the sample was amplified, and the amplified voltage was obtained as follows:

[0072]

[0073] Among them, V F2 K represents the amplified voltage, and K is the amplitude of the amplified voltage. The initial phase of the parent radio frequency signal. This represents the initial phase of the replica radio frequency signal.

[0074] Step S220: Adjust the pre-mixing phase difference between the parent RF signal and the copy RF signal, and determine the quadrant where the pre-mixing phase difference is located based on the changing trend of the mixing output voltage.

[0075] In one embodiment of this application, adjusting the pre-mixing phase difference between the parent RF signal and the copy RF signal, and determining the quadrant of the pre-mixing phase difference based on the changing trend of the mixing output voltage, includes: the mixing output voltage is obtained based on filtering out the RF components after mixing through a low-pass filter; increasing or decreasing the initial phase of the copy RF signal to obtain the adjusted mixing output voltage; and determining the quadrant of the pre-mixing phase difference based on the direction of adjustment of the initial phase and the direction of change between the mixing output voltage and the adjusted mixing output voltage.

[0076] In one embodiment of this application, as shown in equation (4), the amplified voltage V F2The curve is a cosine curve. The phase difference between the parent RF signal and the copy RF signal before mixing... When the phase difference is θ, f(θ) = Kcosθ, which has a monotonically decreasing characteristic, i.e., k2 = f'(θ) ≤ 0. When the phase difference is θ before the positive modulation mixing, the amplification voltage decreases. When the phase difference is -180° to 0, f(θ) has a monotonically increasing characteristic, i.e., k1 = f'(θ) ≥ 0. When the phase difference is θ before the positive modulation mixing, the amplification voltage increases.

[0077] In one embodiment of this application, please refer to Figure 4 , Figure 4 A schematic diagram illustrating the quadrant determination principle according to an embodiment of this application is shown. Figure 4 As shown, based on the aforementioned increase and decrease law of amplification voltage, the phase difference θ before the slight increase mixing is also the initial phase of the slight decrease replica RF signal. To observe the amplified voltage V F2 The increase or decrease in the voltage value can be used to determine the quadrant of the phase difference before mixing. Since the filtered voltage value is in the mV range, it is amplified to the V range by operational amplifier N3, i.e., V... F2 It is rated V.

[0078] In one embodiment of this application, an analog-to-digital converter D1 is used to convert the amplified voltage in analog signal format into a digital signal and input it to the control unit, so that the control unit can determine the phase difference before mixing and the phase difference value before mixing based on the input digital signal.

[0079] Step S230: Based on the adjusted mixing output voltage and the quadrant where the phase difference before mixing is located, the current phase of the replica RF signal is initially adjusted so that the parent RF signal and the replica RF signal are in phase before mixing.

[0080] In one embodiment of this application, the current phase of the replica radio frequency signal is initially adjusted based on the adjusted mixing output voltage and the quadrant where the phase difference before mixing is located, including: determining the phase difference value before mixing based on the adjusted mixing output voltage and the quadrant where the phase difference before mixing is located; adjusting the intermediate frequency phase of the intermediate frequency signal based on the phase difference value before mixing; wherein the intermediate frequency signal is used to generate the replica radio frequency signal.

[0081] In one embodiment of this application, as shown in equation (2), it can be seen that This application first lets Δθ PD =0°, forcing Based on Δθ 插入 Perform phase compensation to make

[0082] In one embodiment of this application, the intermediate frequency signal f output by the intermediate frequency signal generation unit is controlled by the phase control command output by the control unit. IF2 So that Δθ PD →0°. Phase difference Δθ before mixingPD as follows:

[0083] Δθ PD =(θ Lo1 -θ Lo2 )+(θ IF1 -θ IF2 )=Δθ Lo1-2 -Δθ IF1-2 Equation (5)

[0084] Where, Δθ PD For the phase difference before mixing, θ Lo1 θ is the local oscillator phase corresponding to the parent radio frequency signal. Lo2 θ represents the local oscillator phase corresponding to the replica RF signal. IF1 θ represents the intermediate frequency phase corresponding to the parent radio frequency signal. IF2 The intermediate frequency phase corresponding to the replica RF signal, Δθ Lo1-2 For the local oscillator phase difference, Δθ IF1-2 This is the mid-frequency phase difference.

[0085] In one embodiment of this application, equation (5) omits the insertion of a fixed phase difference, and the local oscillator phase difference Δθ Lo1-2 Not numerically controlled and fixed, with only a mid-frequency phase difference of Δθ IF1-2 It is digitally controllable; by adjusting the intermediate frequency (IF) phase of the IF signal, the second RF output signal f can be adjusted. RF2 The purpose of phase is to fix the phase difference between the parent RF signal and the copy RF signal at the input point of the first mixer U1 to a preset phase difference accuracy value, so that Δθ PD The goal of →0° is to ensure that the parent RF signal and the copy RF signal are in phase before mixing.

[0086] Step S240: Measure the phase difference of the phase detection insertion before mixing, and compensate the current phase after initial adjustment based on the phase difference of the phase detection insertion to make the reference RF signal and the copy RF signal corresponding to the phase to be adjusted RF signal in phase.

[0087] In one embodiment of this application, the phase detection insertion difference before mixing is measured, and the phase difference compensation is performed on the current phase after initial adjustment based on the phase detection insertion difference, including: measuring the phase detection insertion difference at the RF signal output terminal using an oscilloscope, the RF signal output terminal being used to characterize the output terminal of the RF signal to be phase-modulated and the reference RF signal; and subtracting the phase detection insertion difference from the intermediate frequency phase after initial adjustment to perform phase difference compensation.

[0088] In one embodiment of this application, the phase detection insertion phase difference is used to characterize the phase difference introduced by the radio frequency phase detection link.

[0089] In one embodiment of this application, the RF signal output is measured by an oscilloscope to determine Δθ. 插入 Finally, add -Δθ插入 That is, to achieve The purpose.

[0090] In one embodiment of this application, the first radio frequency output signal f RF1 Second RF output signal f RF2 After being tuned to in-phase, the first RF output signal f is switched using an RF gating switch. RF1 and the third to nth RF output signals f RF3～n Adjust to be in phase.

[0091] In one embodiment of this application, the first radio frequency output signal f RF1 Second RF output signal f RF2 After the phase difference adjustment at the input of the first mixer U1 is in phase, the second RF output signal f will be used. RF2 The phase control steps involve switching the RF N-to-1 switch Z1 to the third RF output signal f. RF3 The third RF output signal f is obtained through the first mixer U1. RF3 and the first RF output signal f RF1 The phase difference voltage is used to repeat the aforementioned control process to adjust the third intermediate frequency signal f. IF3 The intermediate frequency phase, and so on, are used to realize the RF output signal f of all channels. RF1～n The phase difference at the input of the first mixer U1 is adjusted to the specified value Δθ. PD .

[0092] In one embodiment of this application, please refer to Figure 5 , Figure 5 A schematic diagram of an oscilloscope phase difference test according to one embodiment of this application is shown. Figure 5 As shown, after the phase difference adjustment state of all channels before the input of the first mixer U1 is semi-solidified, the phase difference measurement accuracy is improved by using an oscilloscope at the RF signal output terminal and increasing the number of waveforms num≥10, and Δθ is measured one by one. 插入1-n Create a matrix [n∈N, n≥2, m*(n-1) collection points], record the data, and then add "-Δθ" to each point. 插入1-n "The matrix correction value ultimately reaches the RF output signal f of all channels." RF1～n low phase difference And the purpose of mutual reference.

[0093] In one embodiment of this application, after the reference RF signal and the copy RF signal are in phase, the phase difference value before mixing, the current phase after initial adjustment, and the phase difference compensation value corresponding to each phase-to-be-modulated RF signal are converted into phase control words and stored to obtain a phase control mapping relationship, so that each phase-to-be-modulated RF signal is in phase with the reference RF signal, and the phase difference compensation value is obtained based on phase detection and phase difference insertion; and / or, the RF signal parameters are adjusted based on the obtained channel adjustment requirements, the channel adjustment requirements including at least one of the independent frequency hopping requirements of multiple channel RF signals and the co-frequency co-coordinated frequency hopping requirements of multiple channel RF signals.

[0094] In one embodiment of this application, in order to achieve rapid adjustment of the intermediate frequency signal f of each channel IF2～n The intermediate frequency phase can be used to establish the relationship between the digital signal output by analog-to-digital converter D1 and the intermediate frequency signal f. IF2～n The phase control mapping relationship is used to determine the phase control correspondence. The control unit, through the phase control mapping relationship stored internally in the controller, can directly output a specified phase control code to the intermediate frequency signal generation unit of each channel based on the digital signal input to the control unit, thereby achieving rapid control and adjustment of the intermediate frequency signal f of each channel. IF2～n The purpose of the intermediate frequency phase. The phase control mapping relationship is as follows:

[0095] Table 1 Phase Control Mapping Relationship

[0096] Serial Number phase angle ADC output Control unit phase control word 1 151.0 EF DB 0EFH,0EDH,82H,2DH,82H 2 150.0 EE DB 0EEH,0ECH,0CCH,2CH,0CCH ... ... ... ...

[0097] Among them, the phase difference angle is used to characterize the phase difference before mixing, the ADC output is used to characterize the mixing output voltage corresponding to the phase difference before mixing, and the phase control word of the control unit is the phase control information directly output by the control unit to directly control the intermediate frequency phase of the intermediate frequency signal to the specified phase value.

[0098] In one embodiment of this application, the ADC outputs an 8-bit digital signal. Taking "DB 0EFH,0EDH,82H,2DH,82H" in Table 1 as an example, "DB" represents data, "0EFH" represents a 151-degree phase difference, and "0EDH,82H,2DH,82H" are two phase control words output to the DDS chip, used to configure the 16-bit phase offset word (POW) inside the DDS chip. This allows control of the intermediate frequency signal output by the DDS chip of the specified intermediate frequency signal generation unit, thereby controlling the RF output signal f of the specified channel. RF The purpose is to achieve this. In this example, the two phase-offset words "0EDH,82H" and "2DH,82H" are 270 degrees apart. The purpose is to adjust the RF output signal f through two phase adjustments. RFn调节 To the radio frequency output signal f RF1In phase. If, based on calculations, the phase difference between the nth replica RF signal and the parent RF signal is 151 degrees, then the DDS chip output signal phase needs to be directly adjusted to 334 degrees to achieve a phase difference of 270 degrees between the nth replica RF signal and the parent RF signal. Therefore, the phase offset = 334 ÷ 360 × 2 16 ≈60802, 60802 converted to hexadecimal is "0EDH,82H". The second time, the phase needs to be shifted by another 64 degrees so that the RF output signal f corresponding to the nth replica RF signal... RFn RF output signal f corresponding to the parent radio frequency signal RF1 If they are in phase, then the phase offset = 64 ÷ 360 × 2 16 ≈11650, which is "2DH,82H" in hexadecimal. After sending the corresponding phase control word information to the designated intermediate frequency signal generation unit, the corresponding channel f can be directly controlled. IF To the specified phase value.

[0099] In one embodiment of this application, the application can also implement a priority control communication protocol instruction set for each channel to independently switch frequencies and use the same frequency with coherent frequency hopping in a timely manner, and embed it in the control program.

[0100] In one embodiment of this application, please refer to Figure 6 , Figure 6 A schematic diagram illustrating an embodiment of a multi-channel radio frequency signal phase difference control method according to this application is shown. Figure 6 As shown, the initialization of the local oscillator signal and intermediate frequency signal is as follows: Multiple RF output signals are generated by mixing the generated local oscillator signal and intermediate frequency signal; the RF N-to-1 switch is used to output the i-th RF output signal f. RFi The i-th RF output signal f is selected by an N-to-one RF switch. RFi The signal is transmitted to the first mixer to obtain the i-th replica RF signal; the phase detection voltage V is then obtained. F1 The i-th replica RF signal and the parent RF signal are mixed to obtain the phase detection voltage V. F1 ; Filter out phase detection voltage V F1 The radio frequency component in the image is filtered out by a low-pass filter to remove the phase detector voltage V. F1 The radio frequency component; the amplified and filtered voltage, to obtain the amplified voltage V. F2 The amplitude of the filtered voltage is amplified to the V level using an operational amplifier; the amplified voltage V F2 Converted to a digital signal: The amplified voltage is converted into a digital signal via an analog-to-digital converter, which is the mixer output voltage; the intermediate frequency signal f is adjusted. IFi Phase to specified value: Adjust the i-th intermediate frequency signal f corresponding to the i-th replica RF signal based on the mixer output voltage. IFi Phase; whether the intermediate frequency signal f has been adjusted.IF2 ~f IFn : Adjust the intermediate frequency phase of the intermediate frequency signal corresponding to each replica RF signal sequentially until the adjustment is complete; measure "Δθ". 插入1-n "Matrix: The phase insertion difference of each replica RF signal is obtained by measuring the phase insertion difference at the RF signal output using an oscilloscope; add "-Δθ" 插入1-n "Correction matrix: Subtract the phase difference of the replica RF signal from the initially tuned intermediate frequency (IF) phase to eliminate the phase influence introduced by the RF phase detection link; whether the IF signal f has been corrected." IF2 ~f IFn The phase compensation is performed sequentially on the initially tuned intermediate frequency signal corresponding to each replica RF signal until the correction is complete. This application satisfies the requirement of achieving RF output signal f for all channels. RF1 ~f RFn Under the premise of phase difference index, the number of high-cost components in hardware design is effectively reduced, circuit debugging and quadrant determination are simplified, the threshold for realizing arbitrarily expanded multi-channel products is lowered, and the control is flexible. The phase adjustment command function can be activated at any time under different temperature environment conditions to achieve the purpose of phase difference index calibration and stable output.

[0101] This application simplifies quadrant determination and debugging methods when the phase parameters of the hardware loops differ between channels. It also provides scalable bandwidth, dispersion-free operation, and real-time full-temperature calibration control of the phase of multi-channel mixing signals. The phase difference accuracy of the RF signal can be adjusted to approach 0° infinitely.

[0102] This application, based on a double-balanced mixer and analog-to-digital converter, and combined with microwave circuit design methods and processes, offers advantages such as flexible phase control, high phase difference adjustment accuracy, and low barrier to entry. In related technologies, circuits and methods that use hardware design compensation to ensure the coherence of multi-channel mixing signals suffer from drawbacks such as high barriers to entry and small controllable and adjustable range. This application utilizes a double-balanced mixer to perform phase detection on multi-channel mixing signals one by one. The phase detection voltage and cosine phase difference exhibit a linear correlation region. Through digital control, quadrant determination and adjustment of the phase of multi-channel mixing signals are achieved, enabling real-time phase difference control. This lowers the barrier to entry for phase-shifting hardware circuit design and debugging. The developed product achieves a phase difference adjustment accuracy of up to 3°. Phase difference accuracies less than 3° can be achieved by increasing the resolution bits of the analog-to-digital converter and using phase shifting to cancel residual phase difference in mixing phase detection. It exhibits high consistency in phase difference performance across all temperatures, strong functional expandability, and can output any coherent frequency-hopping mixing signal.

[0103] Embodiments of this application also provide an electronic device, including: one or more processors; and a storage device for storing one or more programs, which, when executed by one or more processors, cause the electronic device to implement the multi-channel radio frequency signal phase difference control method provided in the above embodiments.

[0104] Please see Figure 7 , Figure 7 A schematic diagram of a computer system suitable for implementing the embodiments of this application is shown. It should be noted that... Figure 7 The computer system 700 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0105] like Figure 7 As shown, the computer system 700 includes a Central Processing Unit (CPU) 701, which can perform various appropriate actions and processes based on programs stored in Read-Only Memory (ROM) 702 or programs loaded from storage portion 708 into Random Access Memory (RAM) 703, such as performing the methods described in the above embodiments. The RAM 703 also stores various programs and data required for system operation. The CPU 701, ROM 702, and RAM 703 are interconnected via a bus 704. An Input / Output (I / O) interface 705 is also connected to the bus 704.

[0106] The following components are connected to the I / O interface 705: an input section 706 including a keyboard, mouse, etc.; an output section 707 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 708 including a hard disk, etc.; and a communication section 709 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to the I / O interface 705 as needed. A removable medium 711, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 710 as needed so that computer programs read from it can be installed into the storage section 708 as needed.

[0107] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program including a computer program for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 709, and / or installed from removable medium 711. When the computer program is executed by central processing unit (CPU) 701, it performs various functions defined in the system of this application.

[0108] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying a computer-readable computer program. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0109] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0110] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself. Therefore, the technical solutions according to the embodiments of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, touch terminal, or network device, etc.) to execute the methods according to the embodiments of this application.

[0111] Another aspect of this application provides a computer-readable storage medium storing a computer program thereon, which, when executed by a computer's processor, causes the computer to perform the multi-channel radio frequency signal phase difference control method provided in the various embodiments above. This computer-readable storage medium may be included in the electronic device described in the above embodiments, or it may exist independently and not assembled into the electronic device.

[0112] In the above embodiments, unless otherwise specified, the use of ordinal numbers such as "first" and "second" to describe common objects only indicates that they refer to different instances of the same object, rather than indicating that the objects being described must be in a given order, whether temporally, spatially, sequentially, or in any other way.

[0113] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A multi-channel radio frequency signal phase difference control system, characterized in that, The system includes: a radio frequency phase detection link, a phase difference adjustment circuit, a control unit, and a radio frequency signal generation circuit; The number of radio frequency signal generation circuits is multiple, so as to generate one reference radio frequency signal and multiple radio frequency signals to be phase-modulated; The radio frequency phase detection link includes a radio frequency gating switch and a first mixer. The radio frequency gating switch is used to select a radio frequency signal to be phase-modulated and input it to the first mixer. The first mixer is used to mix the reference radio frequency signal and the selected radio frequency signal to be phase-modulated and output the mixed radio frequency signal to the phase difference adjustment circuit. The phase difference adjustment circuit includes a low-pass filter and an analog-to-digital converter. The low-pass filter is used to filter the mixed radio frequency signal and output the filtered signal to the analog-to-digital converter. The analog-to-digital converter is used to convert the filtered signal into a digital signal and output it to the control unit. The control unit is used to perform phase adjustment on the radio frequency signal generation circuit based on the digital signal, so as to adjust the phase difference between the reference radio frequency signal and the radio frequency signal to be phase-modulated; The radio frequency phase detection link further includes a first radio frequency amplifier, a second radio frequency amplifier, and multiple resistors; the phase difference adjustment circuit further includes an operational amplifier. The reference RF signal is weakly coupled to the second RF amplifier through a resistor. The RF gating switch includes multiple input terminals. Each RF signal to be phase-modulated is weakly coupled to a corresponding input terminal of the RF gating switch through a resistor. The input terminal of the first RF amplifier is connected to the output terminal of the RF gating switch, the output terminal of the first RF amplifier is connected to the first input terminal of the first mixer, and the output terminal of the second RF amplifier is connected to the second input terminal of the first mixer. The output of the first mixer is connected to the input of the low-pass filter, the output of the low-pass filter is connected to the input of the operational amplifier, the output of the operational amplifier is connected to the input of the analog-to-digital converter, and the output of the analog-to-digital converter is connected to the input of the control unit. The output of the control unit is connected to each intermediate frequency signal generation unit used to generate the radio frequency signal to be modulated.

2. The multi-channel radio frequency signal phase difference control system according to claim 1, characterized in that, The multi-channel radio frequency signal phase difference control system also includes at least one of the following: The low-pass filter is used to filter out the radio frequency components after mixing; The radio frequency gating switch includes an absorptive radio frequency switch; The radio frequency amplifier includes a broadband radio frequency amplifier; The first mixer includes a high-level double-balanced mixer; The operational amplifier includes a rail-to-rail single-supply operational amplifier; The analog-to-digital converter has a conversion bit depth of ten bits or more.

3. The multi-channel radio frequency signal phase difference control system according to any one of claims 1-2, characterized in that, The radio frequency signal generation circuit includes a local oscillator signal generation unit, an intermediate frequency signal generation unit, a second mixer, and a filter amplifier circuit. The first input terminal of the second mixer is connected to the output terminal of the local oscillator signal generation unit, the second input terminal of the second mixer is connected to the output terminal of the intermediate frequency signal generation unit, and the output terminal of the second mixer is connected to the input terminal of the filter amplifier circuit. The reference RF signal or the RF signal to be phase-modulated is output through the filter amplifier circuit.

4. The multi-channel radio frequency signal phase difference control system according to claim 3, characterized in that, The multi-channel radio frequency signal phase difference control system also includes a reference frequency generation unit; The reference frequency generation unit includes a reference frequency generation unit, a power divider, a frequency generation module, a frequency divider, a first filtering amplification power divider unit, and a second filtering amplification power divider unit. The reference frequency generation unit is connected to the input terminal of the power divider, the first output terminal of the power divider is connected to the input terminal of the frequency generation module, the second output terminal of the power divider is connected to the input terminal of the frequency divider, the first output terminal of the frequency generation module is connected to the input terminal of the first filter amplification power divider unit, the second output terminal of the frequency generation module is connected to the control unit, and the input terminal of the second filter amplification power divider unit is connected to the output terminal of the frequency divider. The first filtering amplification power divider unit includes multiple power divider output terminals to output multiple intermediate frequency reference clock signals. One power divider output terminal of the first filtering amplification power divider unit is connected to the input terminal of the intermediate frequency signal generation unit. The second filtering amplification power divider unit includes multiple power divider output terminals to output multiple local oscillator reference clock signals. One power divider output terminal of the second filtering amplification power divider unit is connected to the input terminal of the local oscillator signal generation unit.

5. A method for controlling the phase difference of multi-channel radio frequency signals, characterized in that, The method is applied to the multi-channel radio frequency signal phase difference control system as described in any one of claims 1-4, and the method includes: A mixing output voltage is obtained, which is obtained by mixing and filtering the parent RF signal and the replica RF signal. The replica RF signal is selected from multiple RF signals to be phased through an RF gating circuit. The parent RF signal is obtained based on a reference RF signal. Adjust the pre-mixing phase difference between the parent RF signal and the copy RF signal, and determine the quadrant in which the pre-mixing phase difference is located based on the changing trend of the mixing output voltage; Based on the adjusted mixing output voltage and the quadrant in which the phase difference before mixing is located, the current phase of the replica RF signal is initially adjusted so that the parent RF signal and the replica RF signal are in phase before mixing. The phase difference of the phase detection insertion before mixing is measured, and the phase difference compensation is performed on the current phase after initial adjustment based on the phase difference of the phase detection insertion, so that the reference RF signal and the RF signal to be adjusted corresponding to the copy RF signal are in phase.

6. The multi-channel radio frequency signal phase difference control method according to claim 5, characterized in that, Adjusting the pre-mixing phase difference between the parent RF signal and the copy RF signal, and determining the quadrant where the pre-mixing phase difference lies based on the changing trend of the mixing output voltage, includes: The mixing output voltage is obtained based on the radio frequency components after mixing, which are filtered out by a low-pass filter. Increase or decrease the initial phase of the replica radio frequency signal to obtain the adjusted mixer output voltage; The quadrant in which the pre-mixing phase difference lies is determined based on the direction of adjustment of the initial phase and the direction of change between the mixing output voltage and the adjusted mixing output voltage.

7. The multi-channel radio frequency signal phase difference control method according to claim 5, characterized in that, Based on the adjusted mixer output voltage and the quadrant in which the pre-mixing phase difference lies, the current phase of the replica RF signal is initially adjusted, including: The pre-mixing phase difference value is determined based on the adjusted mixing output voltage and the quadrant in which the pre-mixing phase difference is located. The intermediate frequency phase of the intermediate frequency signal is adjusted based on the pre-mixing phase difference value; The intermediate frequency signal is used to generate the replica radio frequency signal.

8. The multi-channel radio frequency signal phase difference control method according to claim 7, characterized in that, Measure the phase difference of the phase detector insertion before mixing, and perform phase difference compensation on the current phase after initial adjustment based on the phase difference of the phase detector insertion, including: The phase difference of the phase detection insertion is measured at the RF signal output terminal using an oscilloscope. The RF signal output terminal is used to characterize the output terminal of the RF signal to be phase-modulated and the reference RF signal. Phase difference compensation is performed by subtracting the phase detection insertion phase difference from the initially tuned intermediate frequency phase.

9. The multi-channel radio frequency signal phase difference control method according to any one of claims 5-8, characterized in that, After making the reference RF signal and the replica RF signal corresponding to the RF signal to be phase-modulated in phase; The phase difference value before mixing, the current phase after initial adjustment, and the phase difference compensation value corresponding to each radio frequency signal to be modulated are converted into phase control words and stored to obtain a phase control mapping relationship, so that each radio frequency signal to be modulated is in phase with the reference radio frequency signal, and the phase difference compensation value is obtained based on the phase difference insertion of the phase detection. And / or, adjust the radio frequency signal parameters based on the obtained channel adjustment requirements, wherein the channel adjustment requirements include at least one of the following: independent frequency hopping requirements for multiple channel radio frequency signals and co-frequency coherent frequency hopping requirements for multiple channel radio frequency signals.

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