A high-accuracy phase calibration method for interferometer microwave channels

Abstract

The embodiments of the present application relate to the technical field of interferometer direction finding, and in particular to a high-accuracy phase calibration method for an interferometer microwave channel, the method comprising: recording the phase difference between each switch working channel and the front-stage circuit and the corresponding switch calibration channel, and performing consistency statistics to obtain consistency calibration parameters of each switch working channel and the front-stage circuit; recording the phase difference between two adjacent switch calibration channels and the back-stage circuit to obtain consistency calibration parameters of each switch calibration channel and the back-stage circuit; recording the phase difference between two adjacent calibration signals output by the power division network to obtain consistency calibration parameters of each calibration signal output by the power division network; performing fusion calculation based on the three consistency calibration parameters to obtain the phase difference between the interferometer microwave channel and the real channel. This method can cover all error values ​​of phase consistency between the interferometer microwave full-link channels and the calibration signal channels, thereby improving the accuracy of interferometer direction finding.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of interferometer direction finding in electronic countermeasures, and in particular to a high-accuracy phase calibration method for an interferometer microwave channel. Background Art

[0002] In the field of interferometer direction finding technology for electronic countermeasures, in order to reduce the impact of microwave channel phase consistency on direction finding accuracy, it is necessary to include all factors affecting phase calibration in each link of the microwave circuit into the calibration data as much as possible during the phase calibration process.

[0003] When designing the interferometer direction-finding microwave channel, we hope to place the working and calibration switches at the earliest possible stage of the circuit. This way, during calibration, the full-link phase error between channels can be calibrated as much as possible. However, in actual engineering, requirements such as high-power limiting protection and out-of-band signal suppression must be considered. This results in the presence of preceding circuits before the working and calibration switches in the microwave channel. The phase consistency of these preceding circuits cannot be eliminated through the post-calibration function of the calibration switch to eliminate the phase error between channels.

[0004] Although the multi-channel equal-amplitude and equal-phase calibration signals divided by the power division network can be realized by using equal-phase power dividers and equal-phase transmission lines, in reality there is still a large error compared with the ideal equal-amplitude and equal-phase signals.

[0005] Due to these factors, if microwave channel phase consistency calibration only considers the post-switch circuitry, there will be a significant error from the actual inter-channel phase difference, and the error can only be covered by the tolerance of the direction-finding system. However, the system tolerance is fixed. If the unaccounted error exceeds the tolerance, it will cause erroneous direction-finding angular information from the interferometer. Even if it does not exceed the tolerance, it will still affect the system's ability to resolve coherence and mitigate multipath. Summary of the Invention

[0006] In view of this, an embodiment of the present application proposes a high-accuracy phase calibration method for an interferometer microwave channel, which can cover all error values ​​of phase consistency between the interferometer microwave full-link channels and the calibration signal channels, so that the system calibration parameters are closer to the true phase consistency parameters, thereby improving the accuracy of the interferometer direction-finding angular information and optimizing the system's ability to resolve coherence and resist multipath.

[0007] To achieve the above-mentioned purpose, an embodiment of the present application proposes a high-accuracy phase calibration method for an interferometer microwave channel, wherein each microwave channel is composed of a front-stage circuit, a working and calibration switch, and a rear-stage circuit, and the two arms of the working and calibration switch are a switch working channel and a switch calibration channel, respectively. The method includes: recording the phase difference between each switch working channel and the front-stage circuit and the corresponding switch calibration channel, and performing consistency statistics to obtain consistency calibration parameters of each switch working channel and the front-stage circuit; recording the phase difference between two adjacent switch calibration channels and the rear-stage circuit to obtain consistency calibration parameters of each switch calibration channel and the rear-stage circuit; recording the phase difference between two adjacent calibration signals output by the power division network to obtain consistency calibration parameters of each calibration signal output by the power division network; performing fusion calculation based on the consistency calibration parameters of each switch working channel and the front-stage circuit, the consistency calibration parameters of each switch calibration channel and the rear-stage circuit, and the consistency calibration parameters of each calibration signal output by the power division network to obtain the phase difference between the interferometer microwave channel and the real channel, thereby completing the phase calibration of the interferometer microwave channel.

[0008] To achieve the above-mentioned purpose, the embodiment of the present application also proposes a high-accuracy phase calibration system for the microwave channel of the interferometer, wherein each microwave channel is composed of a front-stage circuit, a working and calibration switch and a rear-stage circuit, and the two arms of the working and calibration switch are the switch working channel and the switch calibration channel respectively. The system includes: a working channel and front-stage circuit calibration module, which is used to record the phase difference between each switch working channel and the front-stage circuit and the corresponding switch calibration channel, and perform consistency statistics to obtain the consistency calibration parameters of each switch working channel and the front-stage circuit; a calibration channel and rear-stage circuit calibration module, which is used to record the phase difference between two adjacent switch calibration channels. and the phase difference between the subsequent circuits to obtain the consistency calibration parameters of each switch calibration channel and the subsequent circuit; the power division network calibration module is used to record the phase difference between two adjacent calibration signals output by the power division network to obtain the consistency calibration parameters of each calibration signal output by the power division network; the fusion calculation calibration module is used to perform fusion calculation based on the consistency calibration parameters of each switch working channel and the previous circuit, the consistency calibration parameters of each switch calibration channel and the subsequent circuit, and the consistency calibration parameters of each calibration signal output by the power division network to obtain the phase difference between the interferometer microwave channel and the real channel, thereby completing the phase calibration of the interferometer microwave channel.

[0009] To achieve the above-mentioned objectives, an embodiment of the present application further provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute a high-accuracy phase calibration method for an interferometer microwave channel as described above.

[0010] To achieve the above objectives, an embodiment of the present application further provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it can implement a high-accuracy phase calibration method for an interferometer microwave channel as described above.

[0011] In some optional embodiments, the phase difference between each switch working channel and the front-stage circuit and the corresponding switch calibration channel is recorded, and consistency statistics are performed to obtain consistency calibration parameters of each switch working channel and the front-stage circuit, including: traversing each microwave channel; connecting the output end of the vector network to the input end of the analog front end, connecting the input end of the vector network to the output end of the rear-stage circuit of the current microwave channel, and normalizing the phase data of the current microwave channel; then connecting the output end of the vector network to the input end of the front-stage circuit of the current microwave channel, and connecting the input end of the vector network to the output end of the rear-stage circuit of the current microwave channel, obtaining and storing the phase difference between the switch working channel and the front-stage circuit of the current microwave channel and the corresponding calibration channel; after traversing each microwave channel, calculating the difference between the phase differences between each two adjacent switch working channels and the front-stage circuit and the corresponding calibration channel, performing consistency statistics, and obtaining consistency calibration parameters of each switch working channel and the front-stage circuit; wherein, the components in the analog front end and the front-stage circuit are consistent, and the phase difference between the front-stage circuit and the analog front end is compensated by adjusting the electrical length of the transmission line in the analog front end.

[0012] In some optional embodiments, the difference between the phase differences between each two adjacent switch working channels and the front-stage circuit and the corresponding calibration channel is calculated, and consistency statistics are performed to obtain consistency calibration parameters of each switch working channel and the front-stage circuit, including: importing the phase difference between each switch working channel and the front-stage circuit and the corresponding calibration channel into a preset upper computer, and the upper computer calculates the difference between the phase differences between each two adjacent switch working channels and the front-stage circuit and the corresponding calibration channel, and performs consistency statistics to obtain consistency calibration parameters of each switch working channel and the front-stage circuit.

[0013] In some optional embodiments, the phase difference between two adjacent switch calibration channels and subsequent circuits is recorded to obtain consistency calibration parameters of each switch calibration channel and subsequent circuit, including: traversing each microwave channel starting from the second microwave channel; connecting the output end of the vector network to the input end of the power division network, connecting the input end of the vector network to the output end of the subsequent circuit of the previous microwave channel, and normalizing the phase data of the current microwave channel; then connecting the input end of the vector network to the output end of the subsequent circuit of the current microwave channel, obtaining and storing the phase difference between the switch calibration channel and subsequent circuit of the current microwave channel and the switch calibration channel and subsequent circuit of the previous microwave channel; after traversing each microwave channel, obtaining the phase difference between each two adjacent switch calibration channels and subsequent circuits, and then obtaining consistency calibration parameters of each switch calibration channel and subsequent circuit.

[0014] In some optional embodiments, in the process of obtaining consistency calibration parameters of each switch calibration channel and the subsequent circuit, it is necessary to assume that each calibration signal output by the power division network is an ideal equal-phase signal.

[0015] In some optional embodiments, the phase difference between two adjacent calibration signals output by the power division network is recorded to obtain consistency calibration parameters of each calibration signal output by the power division network, including: traversing each calibration signal output by the power division network starting from the second calibration signal; connecting the output end of the vector network to the input end of the power division network, connecting the input end of the vector network to the output end corresponding to the previous calibration signal, and normalizing the phase data of the current calibration signal; then connecting the input end of the vector network to the output end corresponding to the current calibration signal, obtaining and storing the phase difference between the current calibration signal and the previous calibration signal; after traversing each calibration signal output by the power division network, obtaining the phase difference between each adjacent two calibration signals output by the power division network, and then obtaining consistency calibration parameters of each calibration signal output by the power division network.

[0016] In some optional embodiments, a fusion calculation is performed based on the consistency calibration parameters of each switch working channel and the front-stage circuit, the consistency calibration parameters of each switch calibration channel and the back-stage circuit, and the consistency calibration parameters of each calibration signal output by the power division network to obtain the phase difference between the interferometer microwave channel and the real channel, which is achieved by the following formula:

[0017] ΔP x(x-1) =[WC] x(x-1) +[CC] x(x-1) -[cc] x(x-1) ;

[0018] x=2,3,4,…,n;

[0019] Where n represents the total number of microwave channels, [WC] x(x-1)represents the consistency calibration parameters of the switch working channel and the front-stage circuit of the x-th microwave channel, [CC] x(x-1) Indicates the consistency calibration parameters of the switch calibration channel and the subsequent circuit of the xth microwave channel, [cc] x(x-1) Indicates the consistency calibration parameter of the xth calibration signal output by the power division network, ΔP x(x-1) Indicates the phase difference between the xth microwave channel and the real channel.

[0020] The embodiment of the present application proposes a high-accuracy phase calibration method for the microwave channel of the interferometer. The phase calibration of the microwave channel of the interferometer is divided into three parts: the switch working channel and the front-stage circuit, the switch calibration channel and the back-stage circuit, and the calibration signals output by the power division network. For these three parts, corresponding calibration methods are designed respectively, which can cover all error values ​​of the phase consistency between the full-link channels of the interferometer microwave and the calibration signal channels, so that the parameters of the system calibration are closer to the real phase consistency parameters. Through the design of the analog front end, the range of the phase difference value recorded by the vector network can be controlled, and the accuracy of the phase difference consistency can be guaranteed in the subsequent data calculation. The situation where the absolute phase difference value is large and the accuracy of the statistical phase difference consistency is low due to the difference between the working and calibration circuits will not occur. Based on the calibration of these three parts and the final fusion calibration, the influence of the phase consistency of the microwave channel on the interferometer direction finding is eliminated, thereby improving the accuracy of the interferometer direction finding directional angle information and optimizing the system's ability to resolve coherence and resist multipath. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related technologies, the following is a brief introduction to the drawings required for use in the embodiments of the present application or the description of the related technologies. Obviously, the following drawings are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The drawings described here are only used to explain the present application and are not used to limit the present application.

[0022] Figure 1 This is a flow chart of a high-accuracy phase calibration method for an interferometer microwave channel provided in one embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of components of a high-accuracy phase calibration method for an interferometer microwave channel provided in one embodiment of the present application;

[0024] Figure 3 is a schematic diagram of a working and calibration switch provided in one embodiment of the present application;

[0025] Figure 4This is a schematic diagram of the principle of consistency calibration of a switch working channel and a pre-stage circuit provided in one embodiment of the present application;

[0026] Figure 5 This is a schematic diagram of the principle of consistency calibration of a switch calibration channel and a subsequent circuit provided in one embodiment of the present application;

[0027] Figure 6 1 is a schematic diagram of the principle of consistency calibration of various calibration signals output by a power splitter network provided in one embodiment of the present application;

[0028] Figure 7 1 is a schematic structural diagram of a high-accuracy phase calibration system for an interferometer microwave channel provided in one embodiment of the present application;

[0029] Figure 8 It is a structural diagram of an electronic device provided in another embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, each embodiment of the present application will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that in each embodiment of the present application, many technical details are provided to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can be implemented. The division of the following embodiments is for convenience of description and should not constitute any limitation on the specific implementation of the present application. The various embodiments can be combined with each other and referenced to each other under the premise of no contradiction.

[0031] One embodiment of the present application proposes a high-accuracy phase calibration method for an interferometer microwave channel, which is applied to an electronic device, wherein the electronic device can be a terminal or a server. This embodiment and the following embodiments are described using a server as an example. The following describes the implementation details of the high-accuracy phase calibration method for an interferometer microwave channel proposed in this embodiment. The following content is merely provided for ease of understanding and is not required for implementing this solution.

[0032] The specific process of the high-accuracy phase calibration method for the microwave channel of an interferometer proposed in this embodiment can be as follows: Figure 1 Shown, including:

[0033] Step 101 : Record the phase difference between each switch working channel and the preceding circuit and the corresponding switch calibration channel, and perform consistency statistics to obtain consistency calibration parameters of each switch working channel and the preceding circuit.

[0034] In the specific implementation, the phase calibration of the interferometer microwave channel is mainly done as follows Figure 2 The three parts shown are: consistency calibration of the switch working channel and the front-stage circuit, consistency calibration of the switch calibration channel and the back-stage circuit, and consistency calibration of the calibration signals output by the power splitter network. The server first needs to perform consistency calibration of the switch working channel and the front-stage circuit, record the phase difference between each switch working channel and the front-stage circuit and the corresponding switch calibration channel, and perform consistency statistics to obtain the consistency calibration parameters of each switch working channel and the front-stage circuit. The consistency calibration parameters of the switch working channel and the front-stage circuit cover one arm of the switch working channel and the front-stage circuit that characterizes the working and calibration switches, and can eliminate the direction finding out-of-tolerance effect caused by the phase error of the front-stage circuit.

[0035] In one example, Figure 3 As shown in the figure, the working and calibration switch is a Y-shaped switch, and its two arms represent the switch working channel and the switch calibration channel respectively. The switch working channel is connected to the front-stage circuit, and the switch calibration channel is used to receive the calibration signal. It is worth noting that the two arms of the working and calibration switch are not necessarily the same length. Figure 3 Just an example.

[0036] In one example, Figure 4 As shown, when the server performs consistency calibration of the switch working channel and the front-end circuit, it is necessary to traverse each microwave channel, connect the output end of the vector network to the input end of the analog front end, connect the input end of the vector network to the output end of the back-end circuit of the current microwave channel, and normalize the phase data of the current microwave channel.

[0037] Then, the output end of the vector network is connected to the input end of the front-stage circuit of the current microwave channel, and the input end of the vector network is connected to the output end of the back-stage circuit of the current microwave channel to obtain and store the phase difference between the switch working channel of the current microwave channel and the front-stage circuit and the corresponding calibration channel. Taking the first microwave channel as an example, the phase difference between the switch working channel of the first microwave channel and the front-stage circuit and the corresponding calibration channel can be recorded as [WC]1.

[0038] After traversing each microwave channel, the server needs to calculate the phase difference between each adjacent switch working channel and the preceding circuit and the corresponding calibration channel, perform consistency statistics, and obtain the consistency calibration parameters of each switch working channel and the preceding circuit. It should be noted that a single microwave channel does not require phase calibration, so the number of microwave channels in this embodiment is greater than or equal to 2. Taking the first two microwave channels as an example, the consistency calibration parameters of the switch working channel and the preceding circuit of the second microwave channel can be recorded as [WC] 21 , [WC] 21 =[WC]2-[WC]1.

[0039] It is worth noting that the components in the analog front end and the pre-stage circuit are the same. We compensate for the phase difference between the pre-stage circuit and the analog front end by adjusting the electrical length of the transmission line in the analog front end and solidify the analog front end state. n When the channel is changed (n represents the total number of microwave channels), the analog front end used for matching the phase difference does not change its state. When calculating the consistency of the phase difference between any channels, the phase parameter of the analog front end appears in both the minuend and the subtrahend, and has no effect on the data.

[0040] In one example, consistency statistics can be implemented by a host computer. The server imports the phase difference between each switch working channel and the preceding circuit and the corresponding calibration channel into a preset host computer. The host computer then calculates the difference between the phase differences between each two adjacent switch working channels and the preceding circuit and the corresponding calibration channel, performs consistency statistics, and obtains the consistency calibration parameters for each switch working channel and the preceding circuit, which are then transmitted back to the server.

[0041] Step 102 : Record the phase difference between two adjacent switch calibration channels and subsequent circuits to obtain consistency calibration parameters of each switch calibration channel and subsequent circuit.

[0042] In the specific implementation, after completing the consistency calibration of the switch working channel and the front-stage circuit, the server needs to perform consistency calibration of the switch calibration channel and the back-stage circuit. This calibration process needs to be implemented with the help of the power division network.

[0043] In one example, Figure 5 As shown, it is assumed that the calibration signals c1 to c n All are ideal equal-phase signals, c1 to c n Enter the working and calibration switches of n microwave channels respectively (i.e., enter the switch calibration channel). A single microwave channel does not require phase calibration, so the server needs to traverse each microwave channel starting from the second microwave channel, connect the output end of the vector network to the input end of the power division network, connect the input end of the vector network to the output end of the subsequent circuit of the previous microwave channel, and normalize the phase data of the current microwave channel.

[0044] The server then connects the input of the vector network to the output of the subsequent circuit of the current microwave channel, and obtains and stores the phase difference between the switch calibration channel and subsequent circuit of the current microwave channel and the switch calibration channel and subsequent circuit of the previous microwave channel. Taking the first two microwave channels as an example, the phase difference between the switch calibration channel and subsequent circuit of the second microwave channel and the switch calibration channel and subsequent circuit of the first microwave channel can be recorded as [CC] 21 .

[0045] After traversing each microwave channel, the server obtains the phase difference between each adjacent switch calibration channel and the subsequent circuit, and then obtains the consistency calibration parameters of each switch calibration channel and the subsequent circuit. It is worth noting that [CC] 21 That is, it represents the consistency calibration parameters of the switch calibration channel of the second microwave channel and the subsequent circuit.

[0046] Step 103 : Record the phase difference between two adjacent calibration signals output by the power division network to obtain consistency calibration parameters of each calibration signal output by the power division network.

[0047] In a specific implementation, after the server completes consistency calibration of the switch operating channel and its preceding circuitry, as well as the switch calibration channel and its subsequent circuitry, it can then perform consistency calibration of the calibration signals output by the power splitter network. By recording the phase difference between two adjacent calibration signals output by the power splitter network, the server can obtain the consistency calibration parameters for each calibration signal output by the power splitter network.

[0048] In one example, Figure 6 As shown, a single microwave channel does not require phase calibration, so the server needs to traverse the calibration signals output by the power division network starting from the second calibration signal, connect the output end of the vector network to the input end of the power division network, connect the input end of the vector network to the output end corresponding to the previous calibration signal, and normalize the phase data of the current calibration signal.

[0049] The server then connects the input of the vector network to the output corresponding to the current calibration signal, obtains and stores the phase difference between the current calibration signal and the previous calibration signal. Taking the previous two calibration signals as an example, the phase difference between the second calibration signal and the first calibration signal can be recorded as [cc] 21 .

[0050] After traversing all calibration signals output by the power division network, the server can obtain the phase difference between two adjacent calibration signals output by the power division network, and then obtain the consistency calibration parameters of each calibration signal output by the power division network. It is worth noting that [cc] 21 That is, it represents the consistency calibration parameter of the second calibration signal output by the power division network.

[0051] In step 104, a fusion calculation is performed based on the consistency calibration parameters of each switch working channel and the front-stage circuit, the consistency calibration parameters of each switch calibration channel and the back-stage circuit, and the consistency calibration parameters of each calibration signal output by the power division network to obtain the phase difference between the interferometer microwave channel and the real channel, thereby completing the phase calibration of the interferometer microwave channel.

[0052] In the specific implementation, after obtaining the consistency calibration parameters of each switch working channel and the front-stage circuit, the consistency calibration parameters of each switch calibration channel and the back-stage circuit, and the consistency calibration parameters of each calibration signal output by the power division network, the server needs to perform a fusion calculation based on the consistency calibration parameters of each switch working channel and the front-stage circuit, the consistency calibration parameters of each switch calibration channel and the back-stage circuit, and the consistency calibration parameters of each calibration signal output by the power division network to obtain the phase difference between the interferometer microwave channel and the real channel, thereby completing the phase calibration of the interferometer microwave channel.

[0053] In one example, the server performs a fusion calculation based on the consistency calibration parameters of each switch working channel and the preceding circuit, the consistency calibration parameters of each switch calibration channel and the subsequent circuit, and the consistency calibration parameters of each calibration signal output by the power division network to obtain the phase difference between the interferometer microwave channel and the actual channel. This can be achieved using the following formula:

[0054] ΔP x(x-1) =[WC] x(x-1) +[CC] x(x-1) -[cc] x(x-1) ;

[0055] x=2,3,4,…,n;

[0056] Where n represents the total number of microwave channels, [WC] x(x-1) represents the consistency calibration parameters of the switch working channel and the front-stage circuit of the x-th microwave channel, [CC] x(x-1) Indicates the consistency calibration parameters of the switch calibration channel and the subsequent circuit of the xth microwave channel, [cc] x(x-1) Represents the consistency calibration parameter of the zth calibration signal output by the power division network, ΔP x(x-1) Indicates the phase difference between the xth microwave channel and the real channel.

[0057] This embodiment proposes a high-accuracy phase calibration method for the microwave channel of the interferometer. The phase calibration of the microwave channel of the interferometer is divided into three parts: the switch working channel and the front-stage circuit, the switch calibration channel and the back-stage circuit, and the calibration signals output by the power division network. For these three parts, corresponding calibration methods are designed respectively, which can cover all error values ​​of the phase consistency between the full-link channels of the interferometer microwave and the calibration signal channels, so that the parameters of the system calibration are closer to the real phase consistency parameters. Through the design of the analog front end, the range of the phase difference value recorded by the vector network can be controlled, and the accuracy of the phase difference consistency can be guaranteed in the subsequent data calculation. The situation where the absolute phase difference value is large and the accuracy of the statistical phase difference consistency is low due to the difference between the working and calibration circuits will not occur. Based on the calibration of these three parts and the final fusion calibration, the influence of the phase consistency of the microwave channel on the interferometer direction finding is eliminated, thereby improving the accuracy of the interferometer direction finding directional angle information and optimizing the system's ability to resolve coherence and resist multipath.

[0058] The steps of the various methods described above are divided for clarity of description only. They can be combined into a single step, or some steps can be broken down into multiple steps. As long as they share the same logical relationships, they are all within the scope of protection of this application. Adding minor modifications or introducing minor design changes to the algorithm or process, but not changing the core design of the algorithm or process, is also within the scope of protection of this application.

[0059] Another embodiment of the present application proposes a high-accuracy phase calibration system for an interferometer microwave channel. The details of the high-accuracy phase calibration system for an interferometer microwave channel proposed in this embodiment are described in detail below. The following content is only the implementation details provided for ease of understanding and is not necessary for implementing this example.

[0060] Figure 7 This is a structural diagram of a high-precision phase calibration system for an interferometer microwave channel proposed in this embodiment. Each microwave channel of the interferometer consists of a front-stage circuit, a working and calibration switch, and a back-stage circuit. The two arms of the working and calibration switch are a switch working channel and a switch calibration channel, respectively. The system includes: a working channel and front-stage circuit calibration module 201, a calibration channel and back-stage circuit calibration module 202, a power division network calibration module 203, and a fusion calculation calibration module 204.

[0061] The working channel and front-stage circuit calibration module 201 is used to record the phase difference between each switch working channel and front-stage circuit and the corresponding switch calibration channel, and perform consistency statistics to obtain the consistency calibration parameters of each switch working channel and front-stage circuit.

[0062] The calibration channel and subsequent circuit calibration module 202 is used to record the phase difference between two adjacent switch calibration channels and subsequent circuits, and obtain the consistency calibration parameters of each switch calibration channel and subsequent circuit.

[0063] The power division network calibration module 203 is used to record the phase difference between two adjacent calibration signals output by the power division network, and obtain the consistency calibration parameters of each calibration signal output by the power division network.

[0064] The fusion calculation calibration module 204 is used to perform fusion calculation based on the consistency calibration parameters of each switch working channel and the front-stage circuit, the consistency calibration parameters of each switch calibration channel and the back-stage circuit, and the consistency calibration parameters of each calibration signal output by the power division network, to obtain the phase difference between the interferometer microwave channel and the real channel, and complete the phase calibration of the interferometer microwave channel.

[0065] It is not difficult to find that this embodiment is a system embodiment corresponding to the above-mentioned method embodiment, and this embodiment can be implemented in conjunction with the above-mentioned method embodiment. The relevant technical details and technical effects mentioned in the above-mentioned embodiments are still valid in this embodiment, and to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the above-mentioned embodiments.

[0066] It is worth mentioning that all modules involved in this embodiment are logical modules. In actual applications, a logical unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. In addition, to highlight the innovation of this application, this embodiment does not include units that are not closely related to solving the technical problem proposed by this application. However, this does not mean that other units do not exist in this embodiment.

[0067] Another embodiment of the present application provides an electronic device. The specific structure of the electronic device can be as follows: Figure 8 As shown, it includes: at least one processor 301; and a memory 302 communicatively connected to the at least one processor 301; wherein the memory 302 stores instructions that can be executed by the at least one processor 301, and the instructions are executed by the at least one processor 301 to enable the at least one processor 301 to execute a high-accuracy phase calibration method for an interferometer microwave channel as described in the above-mentioned method embodiments.

[0068] The memory and processor are connected via a bus, which includes any number of interconnected buses and bridges. The bus connects various circuits within one or more processors and the memory. The bus can also connect various other circuits, such as peripherals, voltage regulators, and power management circuits. These are well known in the art and will not be described further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be a single component or multiple components, such as multiple receivers and transmitters, providing a means for communicating with various other devices over a transmission medium.

[0069] The processor is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. Memory can be used to store data used by the processor when performing operations.

[0070] Another embodiment of the present application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it can implement a high-accuracy phase calibration method for an interferometer microwave channel as described in the above method embodiments.

[0071] That is, those skilled in the art will understand that all or part of the steps in the above-described embodiments can be implemented by instructing the relevant hardware through a program, which is stored in a storage medium and includes a number of instructions for causing a device (such as a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the methods described in the various embodiments of the present application. Storage media include: U disk, mobile hard disk, read-only memory, random access memory, magnetic disk or optical disk, etc., various media that can store program code.

[0072] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and that in actual applications, various modifications may be made to the embodiments in form and detail without departing from the spirit and scope of the present application. Those skilled in the art will appreciate that improvements and modifications may be made without departing from the principles of the present application, and such improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A high-accuracy phase calibration method for an interferometer microwave channel, wherein each microwave channel is composed of a front-stage circuit, a working and calibration switch, and a back-stage circuit, wherein the two arms of the working and calibration switch are respectively a switch working channel and a switch calibration channel, characterized in that: The method comprises: Record the phase difference between each switch working channel and the preceding circuit and the corresponding switch calibration channel, and perform consistency statistics to obtain the consistency calibration parameters of each switch working channel and the preceding circuit; Record the phase difference between two adjacent switch calibration channels and the subsequent circuit to obtain the consistency calibration parameters of each switch calibration channel and the subsequent circuit; Record the phase difference between two adjacent calibration signals output by the power division network to obtain the consistency calibration parameters of each calibration signal output by the power division network; Based on the consistency calibration parameters of each switch working channel and the front-stage circuit, the consistency calibration parameters of each switch calibration channel and the back-stage circuit, and the consistency calibration parameters of each calibration signal output by the power division network, a fusion calculation is performed to obtain the phase difference between the interferometer microwave channel and the real channel, thereby completing the phase calibration of the interferometer microwave channel.

2. A high-accuracy phase calibration method for an interferometer microwave channel according to claim 1, characterized in that: Record the phase difference between each switch working channel and the preceding circuit and the corresponding switch calibration channel, and perform consistency statistics to obtain the consistency calibration parameters of each switch working channel and the preceding circuit, including: Traverse each microwave channel; Connect the output of the vector network to the input of the analog front end, connect the input of the vector network to the output of the subsequent circuit of the current microwave channel, and normalize the phase data of the current microwave channel; Then, the output end of the vector network is connected to the input end of the front-stage circuit of the current microwave channel, and the input end of the vector network is connected to the output end of the back-stage circuit of the current microwave channel, and the phase difference between the switch working channel of the current microwave channel and the front-stage circuit and the corresponding calibration channel is obtained and stored; After traversing all microwave channels, the phase difference between each of the two adjacent switch working channels and the preceding circuit and the corresponding calibration channel is calculated, and consistency statistics are performed to obtain the consistency calibration parameters of each switch working channel and the preceding circuit; The components in the analog front end are consistent with those in the pre-stage circuit, and the phase difference between the pre-stage circuit and the analog front end is compensated by adjusting the electrical length of the transmission line in the analog front end.

3. A high-accuracy phase calibration method for an interferometer microwave channel according to claim 2, characterized in that: Calculate the phase difference between each of the two adjacent switch working channels and the preceding circuit and the corresponding calibration channel, perform consistency statistics, and obtain the consistency calibration parameters of each switch working channel and the preceding circuit, including: The phase difference between each switch working channel and the front-stage circuit and the corresponding calibration channel is imported into the preset host computer, and the host computer calculates the difference between the phase differences between each two adjacent switch working channels and the front-stage circuit and the corresponding calibration channel, performs consistency statistics, and obtains the consistency calibration parameters of each switch working channel and the front-stage circuit.

4. The high-accuracy phase calibration method for an interferometer microwave channel according to claim 1, characterized in that: Record the phase difference between two adjacent switch calibration channels and the subsequent circuit to obtain the consistency calibration parameters of each switch calibration channel and the subsequent circuit, including: Traverse each microwave channel starting from the second microwave channel; Connect the output of the vector network to the input of the power division network, connect the input of the vector network to the output of the subsequent circuit of the previous microwave channel, and normalize the phase data of the current microwave channel; Then, the input end of the vector network is connected to the output end of the subsequent circuit of the current microwave channel, and the phase difference between the switch calibration channel and the subsequent circuit of the current microwave channel and the switch calibration channel and the subsequent circuit of the previous microwave channel is obtained and stored; After traversing each microwave channel, the phase difference between each two adjacent switch calibration channels and the subsequent circuit is obtained, and then the consistency calibration parameters of each switch calibration channel and the subsequent circuit are obtained.

5. The high-accuracy phase calibration method for an interferometer microwave channel according to claim 4, characterized in that: In the process of obtaining the consistency calibration parameters of each switch calibration channel and the subsequent circuit, it is necessary to assume that the calibration signals output by the power division network are all ideal equal-phase signals.

6. A high-accuracy phase calibration method for an interferometer microwave channel according to claim 5, characterized in that: Record the phase difference between two adjacent calibration signals output by the power division network to obtain the consistency calibration parameters of each calibration signal output by the power division network, including: Starting from the second calibration signal, traverse the calibration signals output by the power division network; Connect the output of the vector network to the input of the power division network, connect the input of the vector network to the output corresponding to the previous calibration signal, and normalize the phase data of the current calibration signal; Then, the input end of the vector network is connected to the output end corresponding to the current calibration signal, and the phase difference between the current calibration signal and the previous calibration signal is obtained and stored; After traversing all calibration signals output by the power division network, the phase difference between two adjacent calibration signals output by the power division network is obtained, and then the consistency calibration parameters of the calibration signals output by the power division network are obtained.

7. A high-accuracy phase calibration method for an interferometer microwave channel according to any one of claims 1 to 6, characterized in that: Based on the consistency calibration parameters of each switch working channel and the front-stage circuit, the consistency calibration parameters of each switch calibration channel and the back-stage circuit, and the consistency calibration parameters of each calibration signal output by the power division network, a fusion calculation is performed to obtain the phase difference between the interferometer microwave channel and the real channel, which is achieved through the following formula: ΔP x(x-1) =[W-C] x(x-1) +[CC] x(x-1) -[cc] x(x-1) ; x=2,3,4,…,n; Where n represents the total number of microwave channels, [WC] x(x-1) represents the consistency calibration parameters of the switch working channel and the front-stage circuit of the x-th microwave channel, [CC] x(x-1) Indicates the consistency calibration parameters of the switch calibration channel and the subsequent circuit of the xth microwave channel, [cc] x(x-1) Indicates the consistency calibration parameter of the xth calibration signal output by the power division network, ΔP x(x-1) Indicates the phase difference between the xth microwave channel and the real channel.

8. A high-accuracy phase calibration system for an interferometer microwave channel, wherein each microwave channel is composed of a front-stage circuit, a working and calibration switch, and a back-stage circuit, wherein the two arms of the working and calibration switch are a switch working channel and a switch calibration channel, respectively. The system comprises: The working channel and front-stage circuit calibration module is used to record the phase difference between each switch working channel and front-stage circuit and the corresponding switch calibration channel, and perform consistency statistics to obtain the consistency calibration parameters of each switch working channel and front-stage circuit; The calibration channel and subsequent circuit calibration module is used to record the phase difference between two adjacent switch calibration channels and subsequent circuits, and obtain the consistency calibration parameters of each switch calibration channel and subsequent circuit; The power division network calibration module is used to record the phase difference between two adjacent calibration signals output by the power division network and obtain the consistency calibration parameters of each calibration signal output by the power division network; The fusion calculation calibration module is used to perform fusion calculation based on the consistency calibration parameters of each switch working channel and the front-stage circuit, the consistency calibration parameters of each switch calibration channel and the back-stage circuit, and the consistency calibration parameters of each calibration signal output by the power division network, to obtain the phase difference between the interferometer microwave channel and the real channel, and complete the phase calibration of the interferometer microwave channel.

9. An electronic device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform a high-accuracy phase calibration method for an interferometer microwave channel according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, it can implement a high-accuracy phase calibration method for an interferometer microwave channel according to any one of claims 1 to 7.

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