Small-view-field temperature sensitive interferometer antenna real-time calibration method

Abstract

The invention provides a small-view-field temperature-sensitive interferometer antenna real-time calibration method under a multi-node parallel processing architecture, and aims at a small-view-field temperature-sensitive interferometer antenna, and a non-cooperative radiation source signal with a known position is utilized to carry out real-time calibration on the small-view-field temperature-sensitive interferometer antenna. According to the invention, a single phase difference correction mode is adopted to compensate a phase difference error value in a full-view-field range in a certain frequency band under a certain center frequency point of the small-view-field temperature-sensitive interferometer antenna, and the improvement efficiency is extremely high; a time-sharing calibration meter, a real-time calibration meter and a historical calibration meter are provided to adapt to the characteristics that the phase difference of the small-view-field temperature-sensitive interferometer antenna has short-period rapid change at different moments in one day and long-period slow change all year round; a real-time calibration table sharing mechanism is designed, and the problem of calibration parameter sharing under a multi-node parallel processing architecture is solved; a time-sharing calibration table updating mechanism with a fixed size is designed, and the problems of lightweight design of a correction number library table and loading time consumption under a real-time processing condition are solved.

Description

Technical Field

[0001] This invention belongs to the field of online electromagnetic spectrum data processing, and relates to a real-time calibration method for a small field-of-view temperature-sensitive interferometer antenna under a multi-node parallel processing architecture. Background Technology

[0002] Surface electromagnetic spectrum activity affects all aspects of daily life. Interferometer antenna positioning systems can achieve direction finding and positioning based on single pulses, and perform radiation source signal sorting based on pulse direction finding information. This offers advantages such as high positioning flexibility and low signal sorting difficulty, and is therefore widely used in multi-platform aerospace-to-Earth observation equipment, serving civilian spectrum monitoring fields such as station verification, frequency planning, and interference source location. The high-precision direction finding and positioning of interferometer antennas is highly correlated with the phase difference measurement accuracy between antennas. As the observation distance increases, the required antenna beam field of view decreases for the same geographical area covered by the antenna beam. However, the same angle measurement error introduces a significantly higher positioning error compared to close-range observation. To improve the direction finding and positioning accuracy of small field-of-view interferometer antennas under long-range observation conditions, the antenna can be calibrated in real time using non-cooperative reference radiation source signals at known locations to improve positioning accuracy. In other words, for traditional interferometer positioning systems, the phase difference between each antenna can be corrected in real time. Typically, interferometer antennas undergo precise industrial measurements before assembly. However, due to the influence of the space environment during use, especially in scenarios with long observation distances and drastic temperature variations over short and long periods, the need for real-time calibration using a non-cooperative reference radiation source becomes even more urgent. To overcome phase difference measurement errors caused by temperature changes under conditions of small field of view and long-distance observation, the following problems need to be addressed during real-time calibration using signals from a non-cooperative reference radiation source at a known location:

[0003] 1) In order to fully utilize the potential of long-distance observation platforms for continuous observation of target areas, it is necessary to process the data collected in a timely manner, otherwise data backlog will occur. Typically, a multi-node parallel data processing architecture is required, which raises the question of how to ensure timely sharing of non-cooperative reference calibration parameters among the processing nodes.

[0004] 2) Due to the influence of changes in the space thermal environment, the antenna phase difference measurement error of the small field-of-view temperature-sensitive interferometer antenna will have a short-period variation pattern throughout the day. At the same time, with the Earth's revolution, the antenna phase difference measurement error will also have a long-period variation pattern. How to make full use of this pattern to improve positioning accuracy during the processing.

[0005] 3) Strictly speaking, the antenna phase measurement error of the small field-of-view temperature-sensitive interferometer antenna fluctuates in different days and time periods. It is necessary to store all the accumulated corrections to meet the correction requirements when reprocessing historical data.

[0006] To address the above issues, this patent employs a single phase difference correction method for small field-of-view beams and designs three types of antenna phase difference correction database tables based on a multi-node parallel processing architecture: time-division calibration table, real-time calibration table, and historical calibration table. Furthermore, it designs a usage and update mechanism for the phase difference correction database tables to satisfy the functions of real-time sharing of calibration parameters across multiple nodes, lightweight updating and use of the time-division calibration table database, and accumulation of historical calibration parameters. Summary of the Invention

[0007] This invention proposes a real-time calibration method for small field-of-view temperature-sensitive interferometer antennas. Based on a multi-node parallel processing architecture, and addressing the real-time processing and calibration requirements of small field-of-view temperature-sensitive interferometer antennas, it designs three types of antenna phase difference correction database tables: time-division calibration table, real-time calibration table, and historical calibration table. Based on the design, accumulation, and usage of these tables, it satisfies the functions of real-time sharing of calibration parameters across multiple nodes, lightweight updating and use of the time-division calibration table database, and accumulation of the historical calibration table. This method adapts to the characteristics of small field-of-view temperature-sensitive interferometer antennas, where the phase difference exhibits rapid short-period changes at different times of the day and slow long-period changes throughout the year.

[0008] The technical solution for achieving this invention is: a real-time calibration method for a small field-of-view temperature-sensitive interferometer antenna, comprising the following steps:

[0009] Step 1: When the data processing task starts, multiple processing nodes are started in parallel. Each processing node loads the time-division calibration table information and, based on the center frequency, signal frequency band, and data time, calculates the phase difference time-division correction. Extract the optimal phase differential time correction for this task. .

[0010] Step 2: Use a single-phase difference correction method to compensate for the antenna of the small field-of-view temperature-sensitive interferometer. The first center frequency point Phase difference error values ​​across the entire field of view within each frequency band are used to construct a real-time phase difference correction number. .

[0011] Step 3: Multiple nodes share the real-time calibration table. Simultaneously, the real-time calibration parameters in the real-time calibration table are used in conjunction with the time-sharing calibration parameters in the time-sharing calibration table. Each processing node autonomously prioritizes the real-time phase difference correction value. When there is no matching correction in the real-time calibration table, the optimal phase difference correction is selected later. .

[0012] Step 4: Update the time-sharing calibration table periodically to keep the total size of the time-sharing calibration table constant, so as to meet the loading timeliness under the conditions of lightweight design and real-time processing.

[0013] Step 5: Periodically add historical calibration data. Each time the time-sharing calibration table is updated, add the historical phase difference correction data to the historical calibration table. The total size of the historical calibration table is constantly increasing to meet the potential need for reprocessing historical data.

[0014] Step 6: After all processing nodes have completed their processing, clear the real-time calibration table for that task.

[0015] Compared with the prior art, the significant advantages of this invention are:

[0016] (1) The single phase difference correction method is used to compensate for the phase difference error value in the full field of view of a certain frequency band at a certain center frequency point of a small field of view temperature sensitive interferometer antenna, which has extremely high improvement efficiency.

[0017] (2) The design, accumulation and use of time-division calibration tables, real-time calibration tables and historical calibration tables are proposed to adapt to the characteristics of the phase difference of small field-of-view temperature-sensitive interferometer antennas, which have short-period rapid changes at different times of the day and long-period slow changes throughout the year.

[0018] (3) A real-time calibration table sharing mechanism was designed to solve the problem of calibration parameter sharing under the multi-node parallel processing architecture. A fixed-size time-sharing calibration table update mechanism was designed to realize the problem of loading time consumption under lightweight design and real-time processing conditions. Attached Figure Description

[0019] Figure 1 This is a flowchart of a real-time calibration method for a small field-of-view temperature-sensitive interferometer antenna under a multi-node parallel processing architecture according to an embodiment of the present invention.

[0020] Figure 2 Flowchart for loading time-sharing calibration table information when each node starts up.

[0021] Figure 3 Flowchart for using real-time calibration parameters in conjunction with time-sharing calibration parameters. Detailed Implementation

[0022] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 As shown in the figure, the present invention provides a real-time calibration method for a small field-of-view temperature-sensitive interferometer antenna, based on a multi-node parallel processing architecture, including the following steps:

[0024] Step 1: When the data processing task starts, multiple processing nodes are started in parallel. Each processing node loads the time-division calibration table information and, based on the center frequency, signal frequency band, and data time, calculates the phase difference time-division correction. Extract the optimal phase differential time correction for this task. .

[0025] Step 1.1: Each processing node fully loads the time-sharing calibration table information:

[0026] The time-division calibration table stores the latest updated positioning calibration parameters and serves the processing tasks of the latest real-time received data. The design of the time-division calibration table is shown in Table 1:

[0027] in, This represents the operating center frequency of the signal receiver. Represents the center frequency point number; Represents The working center frequency bandwidth is equally divided into intervals. One operating frequency band, Represents the signal frequency band number. To adapt to the impact of short-period temperature variations at different times of the day on the phase difference of temperature-sensitive antennas, Represents the phase difference time correction. During the applicable time period of the day, Represents the hourly value. To adapt to the impact of long-period temperature variations at different times of the year on the phase difference of temperature-sensitive antennas, Represents the phase difference time correction. Latest update date; Phase differential time correction This represents an array of phase difference correction values ​​between the two antennas of the platform. This represents the antenna pair number.

[0028] For the same equipment, the working center frequency The number is fixed, the maximum operating bandwidth is fixed, and the operating frequency bands within the center frequency operating bandwidth are equally spaced. The quantity is also fixed, and the total length of the time-based calibration table will be a fixed value, namely: , Indicates the number of center frequency points.

[0029] Step 1.2: For the temperature-sensitive interferometer, considering the changes in the phase difference correction of the long-period antenna throughout the year and the short-period antenna throughout the day, each processing node first calculates the hourly time based on the task data over a 24-hour period. Data date of processing task The loaded time-sharing calibration table will be... Compress to Optimal phase differential time correction Improve the efficiency of positioning calibration parameter selection, and the decision conditions are as follows: Figure 2 As shown, the details are as follows:

[0030] Based on the time value of the task being processed Traversing each center frequency point Corresponding to each signal frequency band Below, find the current time. and the moment in progress , Three calibration parameter records.

[0031] Case 1: If at the current moment Latest update date of calibration parameters Data date of processing task exist Within a day (generally set to 30 days), the current time is preferred. Calibration parameters; if the current time Calibration parameters not met Conditions within a day, based on the nearest time. , The latest update date of the calibration parameters Data date of processing task exist Within a day, conduct near-time... , Optimization of calibration parameters; when approaching the time , All calibration parameters are met Within one day, select the date closest to the latest update date for task processing. The calibration parameters are used as the optimal phase difference corrections. .

[0032] Case 2: If at the current time and the moment in progress , The latest update date of the calibration parameters Data date of processing task All in If it's outside the sky, then choose another time. Latest update date Data date of processing task The nearest calibration parameter is used as the correction for optimal phase difference. .

[0033] Step 2: Use a single-phase difference correction method to compensate for the antenna of the small field-of-view temperature-sensitive interferometer. The first center frequency point Phase difference error values ​​across the entire field of view within each frequency band are used to construct a real-time phase difference correction number. .

[0034] Step 2.1, using a non-cooperative reference radiation source According to the theoretical phase difference and measured phase difference Solve for the center frequency number Signal frequency band number Antenna pair number The corresponding phase difference correction that is universal across the entire field of view .

[0035] Since the field of view of the small field-of-view temperature-sensitive interferometer antenna is very small, it can be assumed that its phase consistency is very high within the field of view. Therefore, it is not necessary to perform angle-related grid division within the field of view across the entire field of view, and the same phase difference correction number can be used. The specific method is as follows:

[0036] Non-cooperative reference radiation source With monitoring radiation sources The match, represent The auxiliary full-pulse sequence, This represents the position information in the WGS84 coordinate system corresponding to the non-cooperative reference radiation. Represents the non-cooperative reference radiation source number. Represents the auxiliary full-pulse sequence number. Represents the total number of pulses. Based on a non-cooperative reference radiation source. With monitoring radiation sources frequency pulse width Double cycle and positioning results The four parameters are correlated and matched, and the successfully correlated radiation sources are monitored. Auxiliary full-pulse sequence Calculate the phase difference correction ,in Represents the center frequency number. Represents the signal frequency band number. This represents the antenna pair number.

[0037] According to the theoretical phase difference and measured phase difference Solve for the center frequency number Signal frequency band number Antenna pair numbering Corresponding phase difference correction Measured phase difference According to The phase difference information in the full-pulse descriptor.

[0038] Theoretical phase difference of each pulse use The arrival time of the pulse is used to interpolate and obtain attitude information. and location information Then, the non-cooperative reference radiation pulses relative to the antenna pair incident vector It can be represented as:

[0039] (1),

[0040] in, This represents the rotation matrix from the antenna coordinate system to the platform body; Let the rotation matrix represent the transition from the platform's body coordinate system to the WGS84 coordinate system, then the theoretical phase difference is... It can be represented as:

[0041] (2),

[0042] in, Indicates antenna pair Vector in antenna coordinate system Indicates pulse Corresponding wavelength. Phase difference correction. It can be accessed:

[0043] (3),

[0044] Then use Indicates the center frequency number Signal frequency band number , representing the antenna pair number The corresponding phase difference correction is independent of the azimuth and elevation angles in the antenna coordinate system. It is used to compensate for the phase difference error value within the entire field of view of a certain frequency band at a certain center frequency point of the small field of view temperature-sensitive interferometer antenna. It has extremely high improvement efficiency. Its innovative feature is that it utilizes the outstanding phase consistency of the small field of view temperature-sensitive interferometer antenna, which is one of the innovative points of this patent.

[0045] Step 2.2: In a multi-node parallel processing architecture, each node can achieve a different center frequency. Signal frequency band Phase difference correction Update to the same real-time calibration table.

[0046] The real-time calibration table is used to address the issue of real-time phase difference corrections generated by each node in a multi-node parallel processing architecture. The question of how to share data with other nodes in real time is addressed in the design of the real-time calibration table, as shown in Table 2.

[0047] in, Represents UTC time. Since real-time calibration tables emphasize the real-time nature of calibration parameters, the update time is the absolute time. Represents the real-time phase difference correction. Latest Update The time needs to be accurate to the second.

[0048] In a multi-node parallel processing architecture, each node processes different data. Therefore, the non-cooperative reference radiation source signals at known locations can be correlated within the data from each node. There are also differences, allowing for different center frequencies. Signal frequency band Accumulation of phase difference corrections renew.

[0049] The real-time calibration table is accumulated by adding new calibration parameters, and each node independently uses a non-cooperative reference radiation source based on step 2.1. Calculate the center frequency number Signal frequency band number , representing the antenna pair number Corresponding phase difference correction .

[0050] Among them, the signal frequency band number :

[0051] (4),

[0052] in, Indicates a non-cooperative reference radiation source frequency, Represents the center frequency number Signal frequency band number Maximum frequency, Represents the center frequency number Signal frequency band number The minimum frequency; the newly added frequency of each node Insert into the same real-time calibration table, absolute time For the current absolute UTC time of the non-cooperative reference radiation source signal, complete... Phase difference correction at corresponding UTC time The newly added real-time calibration table.

[0053] Step 3: Multiple nodes share the real-time calibration table. Simultaneously, the real-time calibration parameters in the real-time calibration table are used in conjunction with the time-sharing calibration parameters in the time-sharing calibration table. Each processing node autonomously prioritizes the real-time phase difference correction value. When there is no matching correction in the real-time calibration table, the optimal phase difference correction is selected later. ,like Figure 3 As shown.

[0054] Because in a single processing task, typically only a portion of the center frequency points are involved. Signal frequency band The accumulated calibration parameters can be updated, so the real-time calibration parameters need to be used in conjunction with the time-sharing calibration parameters.

[0055] Scenario 1: The real-time calibration table is shared by multiple nodes. In each node's processing task, each processing cycle... Each step requires iterating through the real-time calibration table to determine the center frequency based on the frequency of the radiation source to be located and the operating frequency of the payload. and signal frequency band Extract each center frequency point Signal frequency band Down Within hours , Latest phase difference correction , The numbers representing phase difference corrections are sorted according to UTC time. Latest phase difference correction Calculate the average:

[0056] (5),

[0057] It is used to meet the center frequency point Signal frequency band The optimal phase difference real-time correction number used by other radiation sources;

[0058] The operation of averaging multiple phase difference corrections here can eliminate the influence of random errors inherent in the calibration parameters accumulated in a single node, thus ensuring the optimal real-time phase difference correction after averaging. This step more accurately reflects the systematic deviation of the phase difference and reduces the impact of random deviations. At the same time, this step enables the sharing of calibration parameters under a multi-node parallel processing architecture.

[0059] Scenario 2: When using a time-sharing calibration table, if the following conditions are not met... Due to the hourly time requirement, return to step 1.2 to re-obtain the optimal phase difference time correction. .

[0060] Step 4: Update the time-sharing calibration table periodically to keep the total size of the time-sharing calibration table constant, so as to meet the loading timeliness under the conditions of lightweight design and real-time processing.

[0061] In single-node processing tasks, a timed update mechanism is set up. Every hour, the real-time calibration table is traversed to extract the center frequency points. Signal frequency band The corresponding number of phase difference corrections within one hour After averaging them, update the corresponding values ​​in the time-sharing calibration table. Down Meanwhile, regarding the latest update date Update.

[0062] Step 5: Periodically add historical calibration data. Each time the time-sharing calibration table is updated, add the historical phase difference correction data to the historical calibration table. The total size of the historical calibration table is constantly increasing to meet the potential need for reprocessing historical data.

[0063] The historical calibration table is used to accumulate all valid historical calibration parameters. During historical data playback processing tasks, it is necessary to query the historical calibration parameters based on the historical data reception time to improve the positioning accuracy of the playback processing task. The design of the historical calibration table is shown in Table 3:

[0064] Because historical calibration tables emphasize the comprehensiveness of calibration parameters, the update date... Represents the historical correction number of phase difference The specific date of the update differs from the fixed size of the time-sharing calibration table. The historical calibration table continuously accumulates calibration parameters over time to meet the correction requirements during historical data processing.

[0065] Both the time-sharing calibration table and the historical calibration table require periodic updates. The difference lies in how they are updated. The time-sharing calibration table, due to its fixed size, can only update and replace existing data. The historical calibration table, on the other hand, needs to store valid calibration parameters for all time periods, and its update method is appending. For the historical calibration table, a new record is added each time the time-sharing calibration table is updated. .

[0066] Step 6: After all processing nodes have completed their processing, clear the real-time calibration table for that task.

[0067] In practice, the above process can be automated through computer software, and the hardware system for the operation method should also be within the scope of protection.

Claims

1. A small field of view temperature sensitive interferometer antenna real-time calibration method, characterized in that, Comprising the following steps: Step 1: when the data processing task is started, multiple processing nodes are started in parallel, each processing node loads the time scale calibration table information, and extracts the optimal phase difference time correction number for the task according to the center frequency, signal frequency band and data time from the phase difference time correction number ; Step 2: a single phase difference correction method is used to compensate for the phase difference error value in the full field of view range in the first frequency band at the first center frequency of the small field of view temperature sensitive interferometer antenna . . The phase difference real-time correction number is constructed . Step 3: Multi-node shared use of real-time calibration table, while the real-time calibration parameters in the real-time calibration table are used in cooperation with the split-time calibration parameters in the split-time calibration table, and each processing node autonomously selects a phase difference real-time correction number in priority When there is no matching correction number in the real-time calibration table, the last selected optimal phase difference split-time correction number is used ; Step 4: Timing update time-sharing calibration table, keep the overall amount of time-sharing calibration table fixed, meet the lightweight design and real-time processing conditions under the load timeliness; Step 5: Add new history calibration table, add phase difference historical correction in history calibration table every time when updating time-sharing calibration table The total amount of history calibration table is constantly added to meet the possible historical data reprocessing requirements; Step 6: After all processing nodes are processed, clear the real-time calibration table for this task.

2. A small field of view temperature sensitive interferometer antenna real-time calibration method according to claim 1, characterized in that, Step 1, as follows: Step 1.1, each processing node respectively full load time-sharing calibration table information: The time-sharing calibration table stores the latest updated positioning calibration parameters, serves the latest time data processing task received in real time, and the design of the time-sharing calibration table is as shown in Table 1: wherein, represents the working center frequency point of the signal receiver, represents the center frequency point number; represents the represents the equal interval of the working center frequency point bandwidth working frequency bands, represents the signal frequency band number, ; in order to adapt to the influence of short period temperature change on the phase difference of temperature sensitive antenna at different time of a day, represents the phase difference correction number applicable time period within a day, represents the whole point time value, ; in order to adapt to the influence of long period temperature change on the phase difference of temperature sensitive antenna at different time of a year, represents the phase difference correction number the latest update date of the phase difference correction number represents the phase difference correction number array between the two antennas of the platform, represents the antenna pair number; For the same device, the number of working center frequency points is fixed, the maximum working bandwidth is fixed, and the working frequency bands within the center frequency point working bandwidth are equally spaced The number of working frequency bands is also fixed, and the total length of the time scale calibration table will be a fixed value, that is: , represents the number of center frequency points; Step 1.2, the change of the annual long-period and diurnal short-period antenna phase difference correction number of the temperature sensitive interferometer, each processing node first determines the whole point time under 24 hours according to the task data and the data date of the processing task , the loaded time mark calibration table is compressed from to optimal phase difference time correction number , the positioning calibration parameter screening efficiency is improved, and the judgment condition is as follows; According to the time value of the processing task , traversing each center frequency point , corresponding to each signal frequency band , then find the current time and the adjacent time , , three calibration parameter records; Case 1: If at the current moment Latest update date of calibration parameters Data date of processing task exist Within a day, the current moment is preferred. Calibration parameters; if the current time Calibration parameters not met Conditions within a day, based on the nearest time. , The latest update date of the calibration parameters Data date of processing task exist Within a day, , Optimization of calibration parameters; when approaching the time , All calibration parameters are met Within one day, select the date closest to the latest update date for task processing. The calibration parameters are used as the optimal phase difference corrections. ; Case 2: If the current time and the time , of the latest update date of the calibration parameter and the data date of the processing task are all more than days apart, then the calibration parameter with the latest update date and the data date of the processing task closest to the current time is selected as the optimal phase difference correction .

3. A small field of view temperature sensitive interferometer antenna real time calibration method according to claim 2, characterized in that, Step 2, as follows: Step 2.1, using non-cooperative reference radiation sources , according to theoretical phase difference and measured phase difference solving the center frequency point number , signal frequency band number , antenna pair number corresponding phase difference correction number in the whole field of view range ; Step 2.2, under the multi-node parallel processing architecture, each node can realize different center frequency points , signal frequency band , phase difference correction number update to the same real-time calibration table; The real-time calibration table is used to solve the problem of how to share the real-time phase difference correction generated by each node in a multi-node parallel processing architecture with other nodes in real time. The real-time calibration table is designed as shown in Table 2: wherein, represents the UTC time, since the real-time calibration table emphasizes the real-time of the calibration parameters, the update time, i.e. the absolute time represents the phase difference real-time correction number the latest updated time, needs to be accurate to the second level; In a multi-node parallel processing architecture, each node processes different data. Therefore, the non-cooperative reference radiation source signals at known locations can be correlated within the data from each node. There are also differences, allowing for different center frequencies. Signal frequency band Accumulation of phase difference corrections renew; The real-time calibration table is accumulated by adding new calibration parameters, and each node independently uses non-cooperative reference radiation sources based on step 2.1 Calculate the center frequency point number , signal frequency band number , represent the antenna pair number The corresponding phase difference correction number ; Wherein, the signal frequency band number : ， wherein, denotes the frequency of the non-cooperative reference radiation source , represents the center frequency bin number , the signal frequency band number , the maximum frequency represents the center frequency bin number , the signal frequency band number , the minimum frequency; each node newly added is inserted into the same real-time calibration table, and the absolute time is the current absolute UTC time of the non-cooperative reference radiation source signal, and the completion corresponds to the phase difference correction number at the UTC moment , the newly added into the real-time calibration table.

4. A small field of view temperature sensitive interferometer antenna real time calibration method according to claim 3, characterized in that, Step 3, as follows: Because in single processing task, only part of center frequency , signal frequency band Real-time calibration parameters can be updated and accumulated, so real-time calibration parameters need to be used in cooperation with time-sharing calibration parameters. Scenario 1: The real-time calibration table is shared by multiple nodes. In each node's processing task, each processing cycle... Each step requires iterating through the real-time calibration table to determine the center frequency based on the frequency of the radiation source to be located and the operating frequency of the payload. and signal frequency band Extract each center frequency point by iterating through the network. Signal frequency band Down Within hours , Latest phase difference correction , The numbers representing phase difference corrections are sorted according to UTC time. Latest phase difference correction Calculate the average: ， is for satisfying the center frequency , signal band of other radiation sources using the optimal phase difference real-time correction number; Case 2: If the time service requirement of hours is not met when using the time scale correction table, return to step 1.2 to reacquire the optimal phase difference time correction . 1.

3. .

5. A small field of view temperature sensitive interferometer antenna real time calibration method according to claim 4, characterized in that, Step 4, as follows: In the single node processing task, set the timing update mechanism, every full hour, then traverse the real-time calibration table, extract each center frequency , signal frequency band The corresponding phase difference correction number within an hour , after averaging, update to the corresponding , at the same time, update the latest update date .​ 6. A small field of view temperature sensitive interferometer antenna real time calibration method according to claim 5, characterized in that, Step 5, as follows: The historical calibration table is used to accumulate all effective calibration parameters. When the historical data playback processing task is processed, the historical calibration parameters need to be queried according to the historical data receiving time, so as to improve the positioning accuracy of the playback processing task. The design of the historical calibration table is as shown in Table 3: Since the history calibration table emphasizes the comprehensiveness of the calibration parameters, the update date represents the phase difference history correction number The specific date of the update, unlike the fixed size of the split-time calibration table, the history calibration table will accumulate calibration parameters over time to meet the correction number requirement when processing historical data; The time-sharing calibration table and the historical calibration table need to be updated periodically. The difference is that the time-sharing calibration table can only update and replace the existing data because of its fixed size, and the historical calibration table needs to store valid calibration parameters of all time periods, and the updating mode is to add and append. For the historical calibration table, a new record is added in the historical calibration table every time the time-sharing calibration table is updated. .

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