A large aperture antenna tracking zero point compensation method based on soft correction

Abstract

This invention discloses a method for tracking null point compensation of a large-aperture antenna based on soft correction, belonging to the fields of communication and telemetry technology. It includes: in the initial state, writing the tracking null point angle information of each satellite and each frequency band into a tracking null point database; during normal operation, calculating the initial pointing angle of the satellite, receiving the low-frequency downlink signal transmitted by the satellite, and demodulating the low-frequency angular error information; tracking and aligning with the satellite based on the low-frequency angular error information, and writing the azimuth and elevation angles of the large-aperture antenna after alignment as low-frequency tracking null point angle information into the tracking null point database; according to mission requirements, controlling the large-aperture antenna to switch between low-frequency signal tracking and high-frequency signal tracking, and after each switch, writing the tracking null point angle information of the corresponding satellite and the corresponding frequency band into the tracking null point database. This invention can ensure that the large-aperture antenna can be aligned with the satellite under different satellite and different frequency band missions, ensuring the normal operation of the satellite reception mission.

Description

Technical Field

[0001] This invention relates to the fields of communication and measurement and control technology, and in particular to a method for zero-point compensation of large-aperture antenna tracking based on soft correction. Background Technology

[0002] In recent years, communication satellites have developed rapidly, from low frequencies to high frequencies, and from single-band to multi-band integration. Currently, communication satellites have achieved S / Ka+Q / V multi-band integration and are even expanding into the W band. With the expansion of frequency bands, communication capacity and anti-interference performance are continuously improving. To meet the reception requirements of higher frequency satellite communications, the aperture of ground station antennas is also increasing. Currently, commonly used ground station antenna apertures for communication satellites are 12m / 15m / 16m / 18m, etc. However, correspondingly, the beamwidth of the Ka / Q / V bands is relatively narrow. If the ground station cannot accurately track and align with the satellite, the signal reception amplitude will be significantly reduced, and the communication capability will be greatly diminished.

[0003] When installing a large-aperture antenna, the beam pointing of multiple frequency bands is calibrated. However, due to limitations such as manufacturing errors, assembly precision, and frequency dispersion in the large-aperture antenna feed, the tracking null points of the antenna often differ significantly across multiple frequency bands. To eliminate this difference, it is often necessary to repeatedly disassemble and reassemble the antenna, replacing components with larger manufacturing errors, which is time-consuming and labor-intensive. Summary of the Invention

[0004] In view of this, the present invention provides a method for zero-point compensation of large-aperture antennas based on soft correction, which solves the problem of inconsistent tracking zero points in multiple frequency bands during the installation and use of large-aperture antennas.

[0005] The technical solution adopted in this invention is as follows:

[0006] A method for null point compensation for large-aperture antennas based on soft correction includes the following steps:

[0007] Step 1: In the initial state, the tracking angle is adjusted by the servo control device according to the mission information of different satellites, so that the large-aperture antenna is aligned with the satellites in different frequency bands, and the tracking null angle information of each satellite and each frequency band is obtained and written into the tracking null database to complete the first database update.

[0008] Step 2: During normal mission, calculate the initial pointing angle of the satellite based on the orbit data, and after pointing to the satellite, receive the low-frequency downlink signal sent by the satellite. Demodulate the low-frequency angle error information through the tracking receiver and send the low-frequency angle error information to the servo control device.

[0009] Step 3: The servo control device controls the large-aperture antenna to track and align with the satellite based on the low-frequency band angular error information. The azimuth and elevation angles of the large-aperture antenna after alignment are written into the tracking null angle information of the low-frequency band tracking null point and the database is updated.

[0010] Step 4: According to the mission requirements, control the large-aperture antenna to switch between low-frequency band signal tracking and high-frequency band signal tracking. After each switch, write the azimuth and elevation angles of the large-aperture antenna as the tracking null angle information of the corresponding satellite and the corresponding frequency band into the tracking null database to complete the first database update.

[0011] Furthermore, in step 4, the specific method by which the large-aperture antenna switches from low-frequency signal tracking to high-frequency signal tracking is as follows:

[0012] Step 401: Query the high-frequency tracking null angle information of the corresponding satellite in the tracking null database based on the mission information to determine whether the requirements are met. or ,in, This represents the current azimuth angle of the large-aperture antenna. This represents the current elevation angle of the large-aperture antenna. The directional angle found. For the retrieved pitch angle, The half-power beamwidth of the frequency band to be switched to; if it is satisfied, it means that the difference between the current azimuth and elevation angles of the large-aperture antenna and the azimuth and elevation angles of the high-frequency band tracking null angle information is too large, and step 402 is executed; otherwise, step 404 is executed.

[0013] Step 402, calculate the azimuth offset. and pitch offset :

[0014]

[0015]

[0016] in, N represents the total number of updates to the zero-point database, and M represents the set threshold. ; , , , These are the azimuth and elevation angles in the high-frequency tracking zero-point angle information of the corresponding satellite in the tracking zero-point database after the i-th update in the most recent n updates, respectively;

[0017] Step 403, adjust the azimuth offset. and pitch offset Send the data to the servo control device for tracking zero-point angle compensation, and control the large-aperture antenna to point at the compensated angle.

[0018] Then proceed to step 404;

[0019] Step 404: The servo control device controls the large-aperture antenna to switch to high-frequency signal tracking.

[0020] Furthermore, in step 4, the specific method by which the large-aperture antenna switches from high-frequency signal tracking to low-frequency signal tracking is as follows:

[0021] Step 411: Based on the mission information, query the low-frequency tracking null angle information of the corresponding satellite in the tracking null database to determine whether the requirements are met. or ,in, This represents the current azimuth angle of the large-aperture antenna. This represents the current elevation angle of the large-aperture antenna. The directional angle found. For the retrieved pitch angle, The half-power beamwidth of the frequency band to be switched to; if satisfied, it means that the difference between the current azimuth and elevation angles of the large-aperture antenna and the azimuth and elevation angles of the low-frequency band tracking null angle information is too large, and step 412 is executed; otherwise, step 414 is executed.

[0022] Step 412, calculate the azimuth offset. and pitch offset :

[0023]

[0024]

[0025] in, N represents the total number of updates to the zero-point database, and M represents the set threshold. ; , , , These are the azimuth and elevation angles in the high-frequency tracking zero-point angle information of the corresponding satellite in the tracking zero-point database after the i-th update in the most recent n updates, respectively;

[0026] Step 413, adjust the azimuth offset. and pitch offset Send the data to the servo control device for tracking zero-point angle compensation, and control the large-aperture antenna to point at the compensated angle.

[0027] Then proceed to step 414;

[0028] Step 414: The servo control device controls the large-aperture antenna to switch to low-frequency signal tracking.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. This invention can solve the problem of inconsistent tracking null points for multiple frequency bands when installing large-aperture antennas at ground stations.

[0031] 2. This invention can realize real-time updates of tracking zero-point compensation data for large-aperture antennas across multiple frequency bands, avoiding the problem of continuous tracking zero-point shift during long-term use.

[0032] 3. The present invention has the characteristics of being practical, simple, versatile, and cost-effective. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments.

[0034] A method for null point compensation for large-aperture antennas based on soft correction is described below:

[0035] Step 1: In the initial state, based on the mission information of different satellites, manually adjust the tracking angle of the servo control device so that the large-aperture antenna is aligned with the satellite under different satellites and different frequency bands, obtain the tracking null angle information of each satellite and each frequency band, write it into the tracking null database, and complete the first database update.

[0036] Step 2: During normal mission, calculate the initial pointing angle of the satellite based on the orbital data. After controlling the large-aperture antenna to point at the satellite based on the initial pointing angle, first receive the low-frequency downlink signal sent by the satellite, demodulate the angle error information through the tracking receiver, and send the angle error information to the servo control device.

[0037] Step 3: After the servo control device controls the large-aperture antenna to track and align with the satellite based on the low-frequency band angular error signal, it writes the azimuth and elevation angles of the large-aperture antenna as low-frequency band tracking null angle information into the tracking null database, thus completing one database update.

[0038] Step 4: According to the mission requirements, control the large-aperture antenna to switch between low-frequency band signal tracking and high-frequency band signal tracking. After each switch, write the azimuth and elevation angles of the large-aperture antenna as the tracking null angle information of the corresponding satellite and the corresponding frequency band into the tracking null database to complete the first database update.

[0039] For example, the method by which a large-aperture antenna switches from low-frequency signal tracking to high-frequency signal tracking is as follows:

[0040] Based on the mission information, query the high-frequency tracking zero-point angle information of the corresponding satellite in the tracking zero-point database to determine whether the difference between the low-frequency and high-frequency tracking zero-point angle information is too large; assuming the azimuth angle of the low-frequency tracking zero-point angle information is denoted as... The pitch angle is denoted as The azimuth angle of the high-frequency band tracking zero-point angle information is denoted as... The pitch angle is denoted as The high-frequency half-power beamwidth is denoted as Then when or At this time, it is determined that the difference in zero-point angle information between the low-frequency band and the high-frequency band is too large. In this case, the azimuth offset is calculated according to the following formula. and pitch offset :

[0041]

[0042]

[0043] Where n is the smaller of N and M, where N is the total number of updates to the zero-point tracking database, and M is generally taken as... . , , , These represent the azimuth and elevation angles in the high-frequency band tracking zero-point angle information and the low-frequency band tracking zero-point angle information of the corresponding satellite in the tracking zero-point database, respectively, after the i-th update in the most recent n updates. This method can reduce the impact of excessive fluctuations in a single tracking zero value on the correction accuracy.

[0044] Then, the azimuth offset and pitch offset The signal is sent to the servo control device for tracking zero-point angle compensation, controlling the large-aperture antenna to point at the compensated angle, and then switching to high-frequency signal tracking.

[0045] If the difference is within the normal range, the servo control device will control the large-aperture antenna to directly switch to high-frequency signal tracking.

[0046] The method for a large-aperture antenna to switch from high-frequency signal tracking to low-frequency signal tracking is as follows:

[0047] Based on the mission information, query the low-frequency tracking zero-point angle information of the corresponding satellite in the tracking zero-point database. or If the difference in zero-point angle information between the low-frequency and high-frequency bands is too large, then it is determined that the difference is too significant. This is the low-frequency half-power beamwidth. The azimuth offset is then calculated using the following formula. and pitch offset :

[0048]

[0049]

[0050] Then, the azimuth offset and pitch offset The signal is sent to the servo control device for tracking zero-point angle compensation, controlling the large-aperture antenna to point at the compensated angle, and then switching to low-frequency signal tracking.

[0051] If the difference is within the normal range, the servo control device will control the large-aperture antenna to directly switch to low-frequency signal tracking.

[0052] Each time the satellite is aligned, the servo control device writes the current azimuth and elevation angles as the tracking zero-point angle information for the corresponding satellite and frequency band into the tracking zero-point database, and updates the tracking zero-point database in real time, thereby providing continuous compensation and correction for tracking zero-point offset during subsequent use.

[0053] If the large-aperture antenna is to be pointed at other satellites, then for that satellite, perform steps 2 to 4.

[0054] This invention addresses the problem that, during the installation and use of large-aperture antennas, the tracking null points of multiple frequency bands often differ significantly due to limitations such as processing errors, assembly precision, and frequency dispersion in the antenna feed. It employs a soft-correction-based compensation method. First, the tracking null points of the large-aperture antenna across multiple frequency bands are manually calibrated, and the initial tracking null point angle information is written into a tracking null point database. When the antenna performs satellite reception tasks, a servo control device is used to determine the differences in tracking null points across multiple frequency bands in real time. For cases where the differences are too large, correction and compensation are performed. Then, the tracking null point data is updated in real time to ensure that the large-aperture antenna can be aligned with the satellite under different satellite and frequency band missions, guaranteeing the normal operation of satellite reception tasks.

[0055] In summary, this invention enables real-time writing, reading, and updating of the tracking zero-point database using a servo control device. This allows for real-time determination of differences in tracking zero-point angles across multiple frequency bands, real-time tracking zero-point compensation, and the realization of stable tracking alignment of a large-aperture antenna for different satellites at different frequency bands.

Claims

1. A method for null-point compensation for large-aperture antennas based on soft correction, characterized in that, Includes the following steps: Step 1: In the initial state, the tracking angle is adjusted by the servo control device according to the mission information of different satellites, so that the large-aperture antenna is aligned with the satellites in different frequency bands, and the tracking null angle information of each satellite and each frequency band is obtained and written into the tracking null database to complete the first database update. Step 2: During normal mission, calculate the initial pointing angle of the satellite based on the orbit data, and after pointing to the satellite, receive the low-frequency downlink signal sent by the satellite. Demodulate the low-frequency angle error information through the tracking receiver and send the low-frequency angle error information to the servo control device. Step 3: The servo control device controls the large-aperture antenna to track and align with the satellite based on the low-frequency band angular error information. The azimuth and elevation angles of the large-aperture antenna after alignment are written into the tracking null angle information of the low-frequency band tracking null point and the database is updated. Step 4: According to the mission requirements, control the large-aperture antenna to switch between low-frequency band signal tracking and high-frequency band signal tracking. After each switch, write the azimuth and elevation angles of the large-aperture antenna as the tracking null angle information of the corresponding satellite and the corresponding frequency band into the tracking null database to complete the first database update.

2. The method for zero-point compensation of a large-aperture antenna based on soft correction according to claim 1, characterized in that, In step 4, the specific method for the large-aperture antenna to switch from low-frequency signal tracking to high-frequency signal tracking is as follows: Step 401: Query the high-frequency tracking null angle information of the corresponding satellite in the tracking null database based on the mission information to determine whether the requirements are met. or ,in, This represents the current azimuth angle of the large-aperture antenna. This represents the current elevation angle of the large-aperture antenna. The directional angle found. For the retrieved pitch angle, The half-power beamwidth of the frequency band to be switched to; if it is satisfied, it means that the difference between the current azimuth and elevation angles of the large-aperture antenna and the azimuth and elevation angles of the high-frequency band tracking null angle information is too large, and step 402 is executed; otherwise, step 404 is executed. Step 402, calculate the azimuth offset. and pitch offset : in, N represents the total number of updates to the zero-point database, and M represents the set threshold. ; , , , These are the azimuth and elevation angles in the high-frequency tracking zero-point angle information of the corresponding satellite in the tracking zero-point database after the i-th update in the most recent n updates, respectively; Step 403, adjust the azimuth offset. and pitch offset Send the data to the servo control device for tracking zero-point angle compensation, and control the large-aperture antenna to point at the compensated angle. Then proceed to step 404; Step 404: The servo control device controls the large-aperture antenna to switch to high-frequency signal tracking.

3. The method for tracking null points of a large-aperture antenna based on soft correction according to claim 1, characterized in that, In step 4, the specific method for the large-aperture antenna to switch from high-frequency signal tracking to low-frequency signal tracking is as follows: Step 411: Based on the mission information, query the low-frequency tracking null angle information of the corresponding satellite in the tracking null database to determine whether the requirements are met. or ,in, This represents the current azimuth angle of the large-aperture antenna. This represents the current elevation angle of the large-aperture antenna. The directional angle found. For the retrieved pitch angle, The half-power beamwidth of the frequency band to be switched to; if satisfied, it means that the difference between the current azimuth and elevation angles of the large-aperture antenna and the azimuth and elevation angles of the low-frequency band tracking null angle information is too large, and step 412 is executed; otherwise, step 414 is executed. Step 412, calculate the azimuth offset. and pitch offset : in, N represents the total number of updates to the zero-point database, and M represents the set threshold. ; , , , These are the azimuth and elevation angles in the high-frequency tracking zero-point angle information of the corresponding satellite in the tracking zero-point database after the i-th update in the most recent n updates, respectively; Step 413, adjust the azimuth offset. and pitch offset Send the data to the servo control device for tracking zero-point angle compensation, and control the large-aperture antenna to point at the compensated angle. Then proceed to step 414; Step 414: The servo control device controls the large-aperture antenna to switch to low-frequency signal tracking.

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