Switching amplitude consistency calibration method and system

Abstract

The invention provides a switching amplitude consistency calibration method and system, and belongs to the technical field of microwave switching amplitude calibration, and the method comprises the steps: obtaining a calibration instruction, and measuring an initial radio frequency signal through a correction source; a power divider is used for carrying out signal distribution to obtain a radio-frequency signal with consistent amplitude, the radio-frequency signal is transmitted to a direction-finding matrix switch to obtain a signal subjected to matrix processing, a multi-channel receiver and an intermediate-frequency board card are used for processing to obtain multi-channel carrier amplitude information, and a channel amplitude difference and an error value of each channel are calculated; receiving actual amplitude information, and calculating a matrix error value by using a channel amplitude difference; calibrating the switching information according to the error value of each channel and the matrix error value to obtain an amplitude and phase consistency signal; according to the invention, the amplitude consistency and phase consistency of the switch system in a wide temperature range environment are improved, the insertion loss fluctuation of the switch system under a high isolation condition is reduced, the design and manufacturing processes are optimized, and the production efficiency of the switch system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of microwave switch amplitude calibration, and in particular relates to a switch amplitude consistency calibration method and system. Background Art

[0002] In the field of microwave radio frequency (RF) design, the design goals of microwave switches are mainly focused on high isolation and low insertion loss. Common implementation methods currently include: differential structure design based on two or more PIN diodes; this method has relatively flexible structural design and the isolation meets certain requirements, but the parameter discreteness of the PIN diode is high, resulting in large fluctuations in isolation when the switch is turned off.

[0003] Temperature changes have a significant impact on isolation. In high and low temperature environments, the isolation of each channel may change by about 1.5dB, and the isolation consistency of the overall system is difficult to ensure. Therefore, in a multi-channel switch system, the step consistency and phase consistency in the off state are difficult to meet application requirements. Although the insertion loss is reduced to a certain extent, the change in ambient temperature has a greater impact on the dielectric constant of the medium, resulting in significant fluctuations in isolation with environmental changes. The processing and matching process is complex, and the cost of mass production is high.

[0004] Existing technologies are difficult to meet the high isolation and phase consistency requirements in wide temperature range application scenarios; especially under low and high temperature conditions, the environmental adaptability of isolation and amplitude-phase consistency is insufficient, and the manufacturing cost is high and the process implementation is complex, which reduces the industrialization efficiency. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a switch amplitude consistency calibration method and system, which solves the problems of insufficient environmental adaptability of the switching system's amplitude consistency and phase consistency in a wide temperature range environment, large insertion loss fluctuations under high isolation conditions, and low production efficiency.

[0006] In order to achieve the above objectives, the technical solution adopted by the present invention is: on the one hand, the present invention provides a switch amplitude consistency calibration method, comprising the following steps: S1. Obtain calibration instructions and use a correction source to track and measure the initial RF signal; S2, outputting the initial RF signal to a power divider for signal distribution to obtain an amplitude consistent RF signal; S3, using an amplitude-phase consistency cable, transmitting the amplitude-consistent RF signal to a direction-finding matrix switch for processing, and obtaining a matrix-processed signal; S4, using a multi-channel receiver to receive the matrix-processed signal and transmit it to the intermediate frequency board, obtaining multi-channel carrier amplitude information, and calculating the channel amplitude difference and the error value of each channel according to the multi-channel carrier amplitude information; S5, using the direction finding matrix switch to receive the antenna signal, obtain the actual amplitude information, and use the channel amplitude difference to calculate the matrix error value of the direction finding matrix switch; S6. According to the error value of each channel and the matrix error value, the microwave switch information is calibrated to obtain the amplitude and phase consistency signal and output it, thus completing the switch amplitude consistency calibration.

[0007] The beneficial effects of the present invention are as follows: the present invention improves the amplitude consistency of the output signals of each channel by using multi-level correction of a correction source, a power divider and a direction-finding matrix switch; the present invention not only corrects the amplitude error, but also eliminates the phase error introduced by the matrix switch and the receiver, thereby improving the overall consistency of the radio frequency signal; and by setting the connection structure of the correction source, the power divider, the direction-finding matrix switch, the multi-channel receiver and the intermediate frequency board, the automatic operation of the calibration process is realized, from signal distribution to multi-channel reception, and then to error calculation and correction, without manual intervention, thereby improving efficiency and accuracy.

[0008] Furthermore, the S1 comprises the following steps: S101, obtaining a calibration instruction, and using the intermediate frequency board to send the calibration instruction through the controller; S102: The correction source receives the calibration instruction and enters the working mode, tracks and measures the frequency amplitude information output by the microwave switch system, and generates an initial radio frequency signal.

[0009] The beneficial effects of the above further scheme are as follows: the present invention uses a correction source to track and measure the frequency amplitude information output by the microwave switch system, obtains real-time RF signals, and improves the accuracy of RF signal calibration; and enables the present invention to be widely used in multi-channel signal switching systems, providing the ability to support reception and processing in complex signal environments, and improving the quality and stability of signal reception signals.

[0010] Furthermore, the S2 is specifically: The initial RF signal is output to a power divider, and the power divider is used to distribute the signal of the correction source to multiple paths to obtain an amplitude consistent RF signal.

[0011] The beneficial effect of the above further scheme is: the present invention provides the use of a power divider to distribute the phase consistency technical indicators and amplitude consistency indicators of the received signal, thereby maintaining the consistency of the received signal and making a series of losses and phases consistent and output to the next level port.

[0012] Furthermore, the S3 comprises the following steps: S301, transmitting the amplitude consistent radio frequency signal to the direction finding matrix switch by using an amplitude consistent cable; S302: Use a direction finding matrix switch to perform multi-channel switching on the amplitude consistency radio frequency signal, and perform self-checking and correction on the switched amplitude consistency radio frequency signal to obtain a matrix-processed signal.

[0013] The beneficial effect of the above further solution is that the present invention utilizes the direction finding matrix switch to perform step-by-step switching calibration, thereby improving the amplitude consistency and phase consistency of the radio frequency signal.

[0014] Furthermore, the S4 comprises the following steps: S401, using a multi-channel receiver to receive the matrix-processed signal and transmit it to an intermediate frequency board to obtain multi-channel carrier amplitude information; S402, taking the first carrier amplitude information of the first channel as a reference and normalizing it; S403, calculating the channel amplitude difference of each channel except the first channel relative to the first channel according to the first carrier amplitude information and the carrier amplitude information of the remaining channels; S404: Analyze the amplitude difference to obtain the error value of each channel.

[0015] The beneficial effect of the above further scheme is: the present invention uses a multi-channel receiver and calculates the error value of the channel, introduces an error separation and normalization calculation method, accurately compensates for the amplitude error of each channel, and effectively eliminates the inconsistency problem caused by device differences in the system.

[0016] Furthermore, the S5 comprises the following steps: S501, using a direction finding matrix switch to receive antenna signals and obtain actual amplitude information; S502: Subtract the channel amplitude difference from the actual amplitude information to calculate a matrix error value of the direction finding matrix switch.

[0017] The beneficial effects of the above further scheme are as follows: the present invention not only corrects the amplitude error but also eliminates the phase error introduced by the matrix switch and the receiver by utilizing the direction finding matrix switch to receive the actual amplitude information, thereby further improving the overall consistency of the signal; after eliminating the errors introduced by the switch matrix and the multi-channel receiver, the consistency of the system output signal is significantly improved, laying a stable foundation for subsequent signal processing and analysis.

[0018] In order to achieve the above object, according to a second aspect of the present invention, a switch amplitude consistency calibration system is provided, which is used to execute the switch amplitude consistency calibration method, and is characterized by comprising: A correction source module is used to track the frequency amplitude information output by the measurement system in real time and generate an initial RF signal; The power divider module is used to distribute the initial RF signal generated by the correction source into multiple channels to provide a RF signal with consistent amplitude; A direction finding matrix switch module is used to receive an amplitude consistent radio frequency signal using an amplitude consistent cable, and to perform multi-channel switching calibration on the amplitude consistent radio frequency signal to obtain a matrix processed signal; A receiver module is used to receive the matrix-processed signal and perform calibration processing on the matrix-processed signal to obtain an amplitude and phase consistency signal; The intermediate frequency board module is used to collect and correct amplitude and phase consistency based on amplitude and phase consistency signals.

[0019] The beneficial effects of the above scheme are as follows: the present invention uses a direction-finding matrix switch and a multi-channel receiver to perform error analysis on the received signal and eliminate the error introduced by the equipment, thereby providing high-precision amplitude and phase consistency calibration capability, so that the switch amplitude consistency calibration system can adapt to wide temperature range application scenarios; a dynamic feedback mechanism is used to enhance environmental adaptability and effectively reduce performance fluctuations caused by temperature changes; the design process is simplified, mass production is supported, and production costs are reduced; the present invention significantly improves the isolation, amplitude consistency and phase consistency of the microwave switch system, and realizes RF system applications that can meet high requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a flow chart of the method of the present invention.

[0021] Figure 2 4 is a principle block diagram of the switch amplitude consistency calibration method in this embodiment.

[0022] Figure 3 It is a schematic diagram of the actual structure of the principle block diagram of the switch amplitude consistency calibration method in this embodiment. DETAILED DESCRIPTION

[0023] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0024] Example 1 like Figure 1 As shown, the present invention provides a switch amplitude consistency calibration method, and its implementation method is as follows: S1. Obtain calibration instructions and use the calibration source to track and measure the initial RF signal. The specific steps are as follows: S101, obtaining a calibration instruction, and using the intermediate frequency board to send the calibration instruction through the controller; S102: The correction source receives the calibration instruction and enters the working mode, tracks and measures the frequency amplitude information output by the microwave switch system, and generates an initial radio frequency signal.

[0025] In this embodiment, the calibration mode is started, the calibration instruction is obtained, and the calibration instruction is sent through the controller using the intermediate frequency board, the calibration source is started and the working mode is entered, the frequency amplitude information output by the measurement system is tracked in real time, and an initial RF signal is generated.

[0026] S2. Output the initial RF signal to the power divider for signal distribution to obtain an amplitude consistent RF signal, specifically: The initial RF signal is output to a power divider, and the power divider is used to distribute the signal of the correction source to multiple paths to obtain an amplitude consistent RF signal.

[0027] In this embodiment, the initial radio frequency signal is output to a power splitter, and preparation for distribution to multiple paths is performed in the power splitter; The signal of the correction source is distributed to multiple paths using a power divider to obtain an amplitude consistent RF signal, ensuring that the output signal has amplitude consistency.

[0028] S3, using an amplitude-phase consistency cable, transmitting the amplitude-consistent RF signal to a direction-finding matrix switch for processing, and obtaining a matrix-processed signal, the specific steps are: S301, transmitting the amplitude consistent radio frequency signal to the direction finding matrix switch by using an amplitude consistent cable; S302: Use a direction finding matrix switch to perform multi-channel switching on the amplitude consistency radio frequency signal, and perform self-checking and correction on the switched amplitude consistency radio frequency signal to obtain a matrix-processed signal.

[0029] In this embodiment, the amplitude consistent radio frequency signal output by the power divider is transmitted to the direction finding matrix switch via an amplitude consistent cable; The amplitude consistency RF signal is corrected by using a direction finding matrix switch, and the direction finding matrix switch switches the amplitude consistency and phase consistency signals from the power divider; Due to the errors of the matrix switch's own components, there may be inconsistencies in each channel, so the switched amplitude consistency RF signal is self-checked and corrected to obtain a matrix-processed signal.

[0030] S4. Receive the matrix-processed signal using a multi-channel receiver and transmit it to the intermediate frequency board to obtain multi-channel carrier amplitude information. According to the multi-channel carrier amplitude information, calculate the channel amplitude difference and the error value of each channel. The specific steps are as follows: S401, using a multi-channel receiver to receive the matrix-processed signal and transmit it to an intermediate frequency board to obtain multi-channel carrier amplitude information; S402, taking the first carrier amplitude information of the first channel as a reference and normalizing it; S403, calculating the channel amplitude difference of each channel except the first channel relative to the first channel according to the first carrier amplitude information and the carrier amplitude information of the remaining channels; S404: Analyze the amplitude difference to obtain the error value of each channel.

[0031] In this embodiment, the multi-channel receiver receives the matrix-processed signal and transmits it to the intermediate frequency board. However, since errors may be introduced between the channels of the receiver itself, the intermediate frequency board receives the carrier amplitude information of each channel through the receiver and calculates the error value.

[0032] In this embodiment, five channels are used to obtain the carrier amplitude information A1, A2, A3, A4, and A5 of each channel respectively. The carrier amplitude information at this time includes the processing errors of the correction source, the power divider, and the switch matrix; The first carrier amplitude information A1 of the first channel is used as a reference and normalized to 0; According to the first carrier amplitude information A1 and the remaining channel carrier amplitude information A2, A3, A4, A5, the channel amplitude difference of each channel except the first channel relative to the first channel is calculated; the remaining channel carrier amplitude information A2, A3, A4, A5 is subtracted from the first carrier amplitude information to obtain the corresponding amplitude difference; the calculation expression of the amplitude difference is as follows: ; ; ; ; in, Represents the amplitude difference of the second channel relative to the first channel, Indicates the amplitude difference of the third channel relative to the first channel, Indicates the amplitude difference of the fourth channel relative to the first channel, Indicates the amplitude difference of the fifth channel relative to the first channel; The amplitude difference is analyzed, and the carrier amplitude information of each channel is summed to obtain the error value of each channel.

[0033] S5. Utilize the direction finding matrix switch to receive the antenna signal, obtain the actual amplitude information, and use the channel amplitude difference to calculate the matrix error value of the direction finding matrix switch. The specific steps are as follows: S501, using a direction finding matrix switch to receive antenna signals and obtain actual amplitude information; S502: Subtract the channel amplitude difference from the actual amplitude information to calculate a matrix error value of the direction finding matrix switch.

[0034] In this embodiment, in order to eliminate the error introduced by the matrix switch itself, the direction finding matrix switch is used to receive the antenna signal to obtain the actual amplitude information, and the actual amplitude difference is obtained by calculation. , , , ; The actual amplitude information is subtracted from the calibration error amplitude information to obtain the matrix error value of the direction finding matrix switch; the matrix error value calculation expression of the direction finding matrix switch is as follows: ; ; ; ; in, Represents the matrix error value of the second channel relative to the first channel, Represents the matrix error value of the third channel relative to the first channel, Represents the matrix error value of the fourth channel relative to the first channel, Represents the matrix error value of the fifth channel relative to the first channel, Indicates the actual amplitude difference of the second channel relative to the first channel, Indicates the actual amplitude difference of the third channel relative to the first channel. Indicates the actual amplitude difference of the fourth channel relative to the first channel, Indicates the actual amplitude difference of the fifth channel relative to the first channel; The matrix error value is used to eliminate the error introduced by the matrix switch itself to complete the calibration.

[0035] S6. According to the error value of each channel and the matrix error value, the microwave switch information is calibrated to obtain the amplitude and phase consistency signal and output it, thus completing the switch amplitude consistency calibration.

[0036] In this embodiment, the microwave switch information is calibrated according to the error value of each channel and the matrix error value, and the amplitude and phase consistency signals are obtained and output, thereby completing the switch amplitude consistency calibration.

[0037] In this embodiment, Figure 2As shown, a controller is used to issue instructions to control the correction source to track and measure the frequency amplitude information output by the microwave switch system, generate an initial radio frequency signal, and output the initial radio frequency signal to a power divider, and the power divider is used to distribute the signal of the correction source to multiple paths, each path is a direction finding calibration switch, including: a sixth single-pole double switch SPDT6, a seventh single-pole double switch SPDT7, an eighth single-pole double switch SPDT8, a ninth single-pole double switch SPDT9, and a tenth single-pole double switch SPDT10; at the same time, according to multiple direction finding antennas, the actual amplitude information is measured and transmitted to the direction finding calibration switch through the antenna selection switch; the first direction finding antenna passes through the first single-pole double switch SPDT1; the second direction finding antenna and the sixth direction finding antenna pass through the second single-pole double switch SPDT2; the third direction finding antenna and the seventh direction finding antenna pass through the third single-pole double switch SPDT3; the fourth direction finding antenna and the eighth direction finding antenna pass through the fourth single-pole double switch SPDT4; the fifth direction finding antenna passes through the first single-pole double switch SPDT5; The direction finding calibration switch and antenna selection switch are both non-calibrable and are controlled by the controller; The signal from the direction finding calibration switch passes through the down-conversion receiver RX, and the ΔArx error is calculated, and then passes through the analog-to-digital converter AD to obtain the in-phase orthogonal signal IQ; the IQ signal is a modulation method used to represent and process signals; here, the down-conversion receiver RX and the analog-to-digital converter AD are used as direction finding channels and can be calibrated. The down-conversion receiver RX and the analog-to-digital converter AD are controlled by a controller; The in-phase and quadrature signals IQ are obtained as follows: The signal passing through the sixth single-pole double switch SPDT6 is passed through the first down-conversion receiver RX1, and the first error ΔArx1 is calculated using the actual amplitude information and the information transmitted by the power divider, and the first in-phase quadrature signal IQ1 is obtained through the first analog-to-digital converter AD1; The signal passing through the seventh single-pole double switch SPDT7 is passed through the second down-conversion receiver RX2, and the second error ΔArx2 is calculated using the actual amplitude information and the information transmitted by the power divider, and the second in-phase quadrature signal IQ2 is obtained through the second analog-to-digital converter AD12; The signal passing through the eighth single-pole double switch SPDT8 is passed through the third down-conversion receiver RX3, and the third error ΔArx3 is calculated using the actual amplitude information and the information transmitted by the power divider, and the third in-phase quadrature signal IQ3 is obtained through the third analog-to-digital converter AD3; The signal passing through the ninth single-pole double switch SPDT9 is passed through the fourth down-conversion receiver RX4, using the actual amplitude information and the information transmitted by the power divider to calculate the fourth error ΔArx4, and through the fourth analog-to-digital converter AD4 to obtain the fourth in-phase quadrature signal IQ4; The signal passing through the tenth single-pole double switch SPDT10 is passed through the fifth down-conversion receiver RX5, and the fifth error ΔArx5 is calculated using the actual amplitude information and the information transmitted by the power divider, and the fifth in-phase quadrature signal IQ5 is obtained through the fifth analog-to-digital converter AD5; According to the above implementation structure, we can get Figure 3 The actual structural schematic diagram shown selects eight groups of antennas for amplitude comparison. The eight groups of antennas correspond to input 1 to input 8 in the figure respectively. First, the RF signal is input into the amplitude comparison switch matrix through the correction input 4 for switching self-test. After detecting that the amplitude comparison switch is working normally, the antenna input is switched to use, that is, signal measurement is performed through input 1 to input 8, and the RF signal input by the correction input 4 is calibrated with the RF signal input by input 1 to input 8 to obtain amplitude and phase consistency signals and output them to output 1 to output 5. The spare input 1 and spare input 2 are used for function expansion.

[0038] Example 2 In this embodiment, a switch amplitude consistency calibration system is used to execute a switch amplitude consistency calibration method as described in Embodiment 1, including: The correction source module is used to track the frequency amplitude information output by the measurement system in real time, generate an initial RF signal, and distribute the signal to the direction finding matrix switch module through the power divider module; A power divider module is used to distribute the initial RF signal generated by the correction source to multiple paths to provide an RF signal with consistent amplitude; The direction finding matrix switch module is used to receive the amplitude consistent RF signal by using the amplitude consistent cable, and to perform multi-channel switching calibration on the amplitude consistent RF signal to obtain the signal processed by the matrix, thereby ensuring the amplitude consistency and phase consistency of the input signal; A receiver module is used to receive the matrix-processed signal and perform calibration processing on the matrix-processed signal to obtain an amplitude and phase consistency signal; The intermediate frequency board module is used to collect and correct amplitude and phase consistency based on amplitude and phase consistency signals.

[0039] In this embodiment, the working principle of a switch amplitude consistency calibration system is as follows: The correction source module generates a high-precision reference signal and distributes the information to the direction-finding matrix switch module through a power divider; The direction finding matrix switch module ensures that the amplitude and phase consistency of the signal input to the receiving module meets the preset requirements through step-by-step switching correction; The receiving module converts the calibrated signal into a frequency-converting output and outputs it to the intermediate frequency board module, where the amplitude and phase consistency acquisition and correction are completed. The switch amplitude consistency calibration system uses a real-time loop detection mechanism to self-check the device status and dynamically adjust the amplitude and phase correction parameters to adapt to environmental changes.

Claims

1. A switch amplitude consistency calibration method, characterized in that: The following steps are involved: S1. Obtain calibration instructions and use a correction source to track and measure the initial RF signal; S2, outputting the initial RF signal to a power divider for signal distribution to obtain an amplitude consistent RF signal; S3, using an amplitude-phase consistency cable, transmitting the amplitude-consistent RF signal to a direction-finding matrix switch for processing, and obtaining a matrix-processed signal; S4, using a multi-channel receiver to receive the matrix-processed signal and transmit it to the intermediate frequency board, obtaining multi-channel carrier amplitude information, and calculating the channel amplitude difference and the error value of each channel according to the multi-channel carrier amplitude information; S5, using the direction finding matrix switch to receive the antenna signal, obtain the actual amplitude information, and use the channel amplitude difference to calculate the matrix error value of the direction finding matrix switch; S6. According to the error value of each channel and the matrix error value, the microwave switch information is calibrated to obtain the amplitude and phase consistency signal and output it, thus completing the switch amplitude consistency calibration.

2. A switch amplitude consistency calibration method according to claim 1, characterized in that: The S1 comprises the following steps: S101, obtaining a calibration instruction, and using the intermediate frequency board to send the calibration instruction through the controller; S102: The correction source receives the calibration instruction and enters the working mode, tracks and measures the frequency amplitude information output by the microwave switch system, and generates an initial radio frequency signal.

3. A switch amplitude consistency calibration method according to claim 1, characterized in that: The S2 is specifically: The initial RF signal is output to a power divider, and the power divider is used to distribute the signal of the correction source to multiple paths to obtain an amplitude consistent RF signal.

4. A switch amplitude consistency calibration method according to claim 1, characterized in that: The S3 comprises the following steps: S301, transmitting the amplitude consistent radio frequency signal to the direction finding matrix switch by using an amplitude consistent cable; S302: Use a direction finding matrix switch to perform multi-channel switching on the amplitude consistency radio frequency signal, and perform self-checking and correction on the switched amplitude consistency radio frequency signal to obtain a matrix-processed signal.

5. A switch amplitude consistency calibration method according to claim 1, characterized in that: The S4 comprises the following steps: S401, using a multi-channel receiver to receive the matrix-processed signal and transmit it to an intermediate frequency board to obtain multi-channel carrier amplitude information; S402, taking the first carrier amplitude information of the first channel as a reference and normalizing it; S403, calculating the channel amplitude difference of each channel except the first channel relative to the first channel according to the first carrier amplitude information and the carrier amplitude information of the remaining channels; S404: Analyze the amplitude difference to obtain the error value of each channel.

6. A switch amplitude consistency calibration method according to claim 1, characterized in that: The S5 comprises the following steps: S501, using a direction finding matrix switch to receive antenna signals and obtain actual amplitude information; S502: Subtract the channel amplitude difference from the actual amplitude information to calculate a matrix error value of the direction finding matrix switch.

7. A switch amplitude consistency calibration system, used to execute a switch amplitude consistency calibration method according to any one of claims 1 to 6, characterized in that: include: A correction source module is used to track the frequency amplitude information output by the measurement system in real time and generate an initial RF signal; The power divider module is used to distribute the initial RF signal generated by the correction source into multiple channels to provide a RF signal with consistent amplitude; A direction finding matrix switch module is used to receive an amplitude consistent radio frequency signal using an amplitude consistent cable, and to perform multi-channel switching calibration on the amplitude consistent radio frequency signal to obtain a matrix processed signal; A receiver module is used to receive the matrix-processed signal and perform calibration processing on the matrix-processed signal to obtain an amplitude and phase consistency signal; The intermediate frequency board module is used to collect and correct amplitude and phase consistency based on amplitude and phase consistency signals.

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