CN114389036A - Satellite closed-loop tracking method and system for satellite low-orbit by satellite-satellite communication phased-array antenna - Google Patents
Satellite closed-loop tracking method and system for satellite low-orbit by satellite-satellite communication phased-array antenna Download PDFInfo
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Abstract
The invention relates to the technical field of antennas, in particular to a satellite low-orbit satellite closed-loop tracking method and system of a satellite low-orbit phased array antenna. In the closed-loop tracking method, a phased array antenna low-orbit satellite closed-loop tracking system is firstly built, a pointing correction module works in a bias scanning mode, and the pointing angle of a phased array antenna in a program tracking module is corrected according to bias beam angle information; the closed-loop tracking module receives the equivalent signal-to-noise ratio transmitted by the signal-to-noise ratio compensation module under the pointing of the zero offset wave beam and the offset wave beams, selects the corresponding offset angle under the maximum signal-to-noise ratio and transmits the offset angle to the pointing correction module; correcting the program tracking angle to control the phased array antenna to point to the satellite; further, closed-loop tracking of the low-orbit satellite can be effectively realized, and the influence caused by different antenna gains under the condition of different pitching angles of the phased array antenna can be avoided; the invention solves the problem of closed-loop tracking of the satellite communication phased-array antenna in the prior art.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a satellite low-orbit satellite closed-loop tracking method and system of a satellite low-orbit phased array antenna.
Background
The traditional high-orbit communication satellite generally adopts a paraboloid system antenna, and the gain of the antenna is fixed and unchanged in the satellite tracking process under the drive of a servo structure. After the terminal is started, the parabolic antenna terminal carries out open-loop pointing of the satellite through self position attitude information and orbit information of the satellite. Meanwhile, the high-orbit communication satellite generally provides beacon signals, the beacon signals are transmitted to a beacon machine after being received by the parabolic antenna, the beacon machine provides signal tracking levels to feed back to a parabolic antenna terminal, and the parabolic terminal drives a servo structure to adjust the pointing direction according to the signal levels to complete closed-loop tracking. However, in order to improve the utilization efficiency of the frequency spectrum, the low-orbit satellite does not provide a beacon signal, and meanwhile, in the tracking process of the phased array antenna, the gain of the antenna is different under the condition of different pitching angles. In the two cases, the closed-loop tracking method of the phased-array antenna low-orbit satellite is adversely affected, the tracking performance is reduced, and the satellite communication performance is affected.
Disclosure of Invention
The invention aims to provide a closed-loop tracking method for a low-orbit satellite of a satellite phased array antenna, and solves the problem of closed-loop tracking of the low-orbit satellite phased array antenna.
In order to achieve the purpose, the invention provides a satellite closed-loop tracking method for a satellite low-orbit satellite by using a satellite-borne phased array antenna, which comprises the following steps:
a phased array antenna low-orbit satellite closed-loop tracking system is built: the method comprises the steps that a phased array antenna low-orbit satellite closed-loop tracking system is built and comprises an ephemeris forecasting module, a time sequence management module, a carrier position and attitude module, a program tracking pointing module, a pointing correction module, a signal-to-noise ratio receiving module, a signal-to-noise ratio compensation module and a closed-loop tracking module; the program tracking pointing module and the closed loop tracking module are respectively connected with the pointing correction module; the ephemeris forecasting module and the carrier position and attitude module are respectively connected with the program tracking and pointing module; the signal-to-noise ratio receiving module is connected with the signal-to-noise ratio compensation module, and the signal-to-noise ratio compensation module is connected with the closed loop tracking module; the time sequence management module is connected with the program tracking and pointing module, the time sequence management module is connected with the pointing correction module, and the time sequence management module is connected with the closed loop tracking module;
generating an antenna pointing angle through a program tracking pointing module;
performing beam scanning through bias beam correction, and controlling the phased array antenna to point to a satellite through the corrected pointing angle;
performing equivalent signal-to-noise ratio compensation under different pointing angles of the antenna;
and carrying out closed loop tracking correction through equivalent signal-to-noise ratio comparison.
Wherein, the closed loop tracking correction through the comparison of equivalent signal-to-noise ratio is specifically as follows: the closed-loop tracking module receives the zero offset wave beam and the equivalent signal-to-noise ratio under the pointing of 8 offset wave beams, selects the corresponding offset angle under the maximum signal-to-noise ratio and transmits the offset angle to the pointing correction module, the pointing correction module works in a closed-loop tracking correction mode after receiving correction information of the closed-loop tracking module, and the phased array antenna is controlled to point to a satellite through the tracking angle of the correction program.
In the step of generating the antenna pointing angle through the program tracking pointing module, the program tracking module acquires the latest satellite position information, carrier position information and attitude information to generate the tracking angle of the satellite and transmits the tracking angle to the pointing correction module by taking the current UTC time and the pulse per second signal as the initial time T as the reference and delta T as the interval.
In the step, an antenna pointing angle is generated through a program tracking pointing module, a time sequence management module receives UTC time information and generates a satellite tracking time sequence with a time sequence interval delta t by taking a pulse per second signal as a reference.
And during the step of beam scanning through bias beam correction, the pointing correction module works in a bias scanning mode, corrects the pointing angle of the phased array antenna in the program tracking module according to bias beam angle information, and the corrected pointing angle controls the phased array antenna to point to the satellite.
In the step, equivalent signal-to-noise ratio compensation is carried out under different pointing angles of the antenna, the signal-to-noise ratio receiving module obtains the signal-to-noise ratio when the antenna points, the signal-to-noise ratio compensation module inquires antenna gain compensation according to the pitch angle of the antenna, and the equivalent signal-to-noise ratio is calculated and fed back to the closed-loop tracking module.
The signal-to-noise ratio compensation module inquires antenna gain compensation according to the antenna pitch angle, and the method specifically comprises the following steps: the pitch angle of the phased array antenna is increased along with the deviation from the normal direction, the antenna gain is reduced, and when an antenna directional diagram is tested, the gain difference value in the direction opposite to (in) the normal direction is generated at different pitch angles, so that the compensation file of the antenna gain is generated.
Another aspect of the present invention provides a satellite closed-loop tracking system for satellite low-earth orbit with satellite-satellite phased array antenna, comprising: the system comprises an ephemeris forecasting module, a time sequence management module, a carrier position and attitude module, a program tracking and pointing module, a pointing correction module, a signal-to-noise ratio receiving module, a signal-to-noise ratio compensation module and a closed-loop tracking module which are sequentially connected.
The ephemeris forecasting module is used for carrying out position estimation of the low-orbit satellite at the future time;
the time sequence management module is used for carrying out time sequence management and synchronization of satellite tracking;
the carrier position and posture module is used for acquiring the position and posture information of the carrier at the current moment;
the program tracking and pointing module is used for resolving a pointing angle of the antenna according to the position of the satellite, the position of the carrier and the attitude information;
the pointing correction module is used for finishing correction of the pointing angle of the phased array antenna in the program tracking module and controlling the beam pointing of the phased array antenna;
the signal-to-noise ratio receiving module is used for acquiring the signal-to-noise ratio of the satellite signal under the current satellite tracking angle;
the signal-to-noise ratio compensation module is used for performing gain compensation and calculating to obtain an equivalent signal-to-noise ratio;
and the closed loop tracking module is used for selecting the offset angle information under the maximum signal-to-noise ratio and correcting the pointing angle.
The invention has the following beneficial effects:
by applying the technical scheme of the invention, firstly, a phased array antenna low-orbit satellite closed-loop tracking system is built, a pointing correction module works in a bias scanning mode, and the pointing angle of a phased array antenna in a program tracking module is corrected according to bias beam angle information; the closed-loop tracking module receives the equivalent signal-to-noise ratio transmitted by the signal-to-noise ratio compensation module under the pointing of the zero offset wave beam and the offset wave beams, selects the corresponding offset angle under the maximum signal-to-noise ratio and transmits the offset angle to the pointing correction module; after receiving the correction information of the closed-loop tracking module, the pointing correction module works in a closed-loop tracking correction mode, and a correction program tracks an angle to control the phased array antenna to point to a satellite; further, closed-loop tracking of the low-orbit satellite can be effectively realized, and the influence caused by different antenna gains under the condition of different pitching angles of the phased array antenna can be avoided; the technical scheme of the invention effectively solves the problem of closed-loop tracking of the satellite communication phased-array antenna in the prior art.
Drawings
FIG. 1 is a schematic flow chart of a satellite closed-loop tracking method for satellite communication phased-array antennas according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a satellite closed-loop tracking system of a satellite in a satellite low orbit using a satellite flux phased array antenna according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
As shown in fig. 1 and fig. 2, the closed-loop tracking method for the satellite with the satellite in low orbit by the satellite flux phased array antenna provided by the invention comprises the following steps:
a phased array antenna low-orbit satellite closed-loop tracking system is built: the phased array antenna low-orbit satellite closed-loop tracking system comprises an ephemeris forecasting module, a time sequence management module, a carrier position and attitude module, a program tracking pointing module, a pointing correction module, a signal-to-noise ratio receiving module, a signal-to-noise ratio compensation module and a closed-loop tracking module;
generating an antenna pointing angle through a program tracking pointing module;
performing beam scanning through bias beam correction, and controlling the phased array antenna to point to a satellite through the corrected pointing angle;
performing equivalent signal-to-noise ratio compensation under different pointing angles of the antenna;
and carrying out closed loop tracking correction through equivalent signal-to-noise ratio comparison.
The program tracking and pointing module and the closed loop tracking module are respectively connected with the pointing correction module; the ephemeris forecasting module and the carrier position and attitude module are respectively connected with the program tracking and pointing module; the signal-to-noise ratio receiving module is connected with the signal-to-noise ratio compensation module, and the signal-to-noise ratio compensation module is connected with the closed loop tracking module; the time sequence management module is connected with the program tracking and pointing module, the time sequence management module is connected with the pointing correction module, and the time sequence management module is connected with the closed loop tracking module.
The closed-loop tracking correction is carried out by comparing equivalent signal-to-noise ratios, specifically, a closed-loop tracking module receives a zero offset wave beam and equivalent signal-to-noise ratios under the pointing of 8 offset wave beams, selects a corresponding offset angle under the maximum signal-to-noise ratio and transmits the offset angle to a pointing correction module, the pointing correction module works in a closed-loop tracking correction mode after receiving correction information of the closed-loop tracking module, and a phased array antenna is controlled to point to a satellite by tracking the angle through a correction program.
In the embodiment, firstly, a phased array antenna low-orbit satellite closed-loop tracking system is built, a pointing correction module works in an offset scanning mode, and the pointing angle of a phased array antenna in a program tracking module is corrected according to offset beam angle information; the closed-loop tracking module receives the equivalent signal-to-noise ratio transmitted by the signal-to-noise ratio compensation module under the pointing of the zero offset wave beam and the offset wave beams, selects the corresponding offset angle under the maximum signal-to-noise ratio and transmits the offset angle to the pointing correction module; after receiving the correction information of the closed-loop tracking module, the pointing correction module works in a closed-loop tracking correction mode, and a correction program tracks an angle to control the phased array antenna to point to a satellite; and further, the closed-loop tracking of the low-orbit satellite can be effectively realized. Wherein the plurality of offset beam pointing is in particular 8 offset beam pointing.
Specifically, in the step of generating the antenna pointing angle through the program tracking pointing module, the program tracking module acquires the latest satellite position information, carrier position and attitude information by taking the current UTC time and pulse per second signal as the initial time T as the reference and delta T as the intervalInformation generating tracking angle of satellite (phi)n，θn)，n＝1，2，3……]And transmitting the data to the pointing correction module.
Specifically, in the step of generating the antenna pointing angle through a program tracking pointing module, after receiving the UTC time information, a time sequence management module generates a satellite tracking time sequence by taking a pulse per second signal as a reference, wherein the time sequence interval is delta t.
Furthermore, in the step of beam scanning through bias beam correction, the pointing correction module works in a bias scanning mode, the pointing angle of the phased array antenna in the program tracking module is corrected according to bias beam angle information, and the corrected pointing angle controls the phased array antenna to point to the satellite.
Specifically, in the step of performing equivalent signal-to-noise ratio compensation under different pointing angles of the antenna, the signal-to-noise ratio receiving module acquires a signal-to-noise ratio when the antenna points, the signal-to-noise ratio compensation module inquires antenna gain compensation according to an antenna pitch angle, and the equivalent signal-to-noise ratio is calculated and fed back to the closed-loop tracking module.
Further, the signal-to-noise ratio compensation module inquires that the antenna gain compensation is specifically as follows according to the antenna pitch angle: the pitch angle of the phased array antenna is increased along with the deviation from the normal direction, the antenna gain is reduced, and when an antenna directional diagram is tested, the gain difference value in the direction opposite to (in) the normal direction is generated at different pitch angles, so that the compensation file of the antenna gain is generated.
The satellite closed loop tracking system of the satellite in low orbit of phased array antenna of the satellite of defending that another aspect of the invention provides includes: the system comprises an ephemeris forecasting module, a time sequence management module, a carrier position and attitude module, a program tracking and pointing module, a pointing correction module, a signal-to-noise ratio receiving module, a signal-to-noise ratio compensation module and a closed-loop tracking module.
Specifically, the program tracking pointing module and the closed loop tracking module are respectively connected with the pointing correction module; the ephemeris forecasting module and the carrier position and attitude module are respectively connected with the program tracking and pointing module; the signal-to-noise ratio receiving module is connected with the signal-to-noise ratio compensation module, and the signal-to-noise ratio compensation module is connected with the closed loop tracking module; the time sequence management module is connected with the program tracking and pointing module, the time sequence management module is connected with the pointing correction module, and the time sequence management module is connected with the closed loop tracking module.
Specifically, the ephemeris forecasting module functions as: carrying out position estimation of the low-orbit satellite at the future moment;
the time sequence management module has the functions of: performing time sequence management and synchronization of satellite tracking;
the carrier position and attitude module has the functions of: acquiring the position and posture information of the carrier at the current moment;
the function of the program trace pointing module is: calculating the pointing angle of the antenna according to the position of the satellite, the position of the carrier and the attitude information;
the function of the pointing correction module is as follows: finishing correcting the pointing angle of the phased array antenna in the program tracking module and controlling the beam pointing of the phased array antenna;
the function of the signal-to-noise ratio receiving module is as follows: acquiring the signal-to-noise ratio of a satellite signal under the current satellite tracking angle;
the signal-to-noise ratio compensation module has the functions of: performing gain compensation, and calculating to obtain an equivalent signal-to-noise ratio;
the functions of the closed loop tracking module are: and selecting the offset angle information under the maximum signal-to-noise ratio for correcting the pointing angle.
In order to further understand the technical solution of the present invention, the following further detailed description is provided.
The closed-loop tracking method of the satellite with the satellite low orbit provided by the invention comprises the following specific steps:
first step, constructing phased array antenna low-orbit satellite closed-loop tracking system
Phased array antenna low-orbit satellite closed-loop tracking system includes: the system comprises an ephemeris forecasting module, a time sequence management module, a carrier position and attitude module, a program tracking and pointing module, a pointing correction module, a signal-to-noise ratio receiving module, a signal-to-noise ratio compensation module and a closed-loop tracking module.
The function of the ephemeris forecast module is: based on the ephemeris at the current moment, carrying out position estimation of the low-orbit satellite at the future moment;
the time sequence management module has the functions of: performing time sequence management and synchronization of satellite tracking;
the carrier position and attitude module has the functions of: acquiring the position and attitude information of the carrier at the current moment and providing a pulse per second for providing a time reference;
the function of the program trace pointing module is: resolving the pointing angle of the antenna according to the position of the satellite, the position of the carrier and the attitude information, wherein the pointing angle comprises an azimuth angle and a pitch angle;
the function of the pointing correction module is as follows: working in a bias scanning mode or a closed-loop tracking correction mode, finishing correcting the pointing angle of the phased array antenna in the program tracking module, and controlling the beam pointing of the phased array antenna;
the function of the signal-to-noise ratio receiving module is as follows: acquiring the signal-to-noise ratio of a satellite signal under the current satellite tracking angle;
the signal-to-noise ratio compensation module has the functions of: under the satellite tracking pitch angle, inquiring a compensation file of antenna gain to obtain an antenna gain compensation value, and calculating with the signal-to-noise ratio received by the signal-to-noise ratio receiving module to obtain an equivalent signal-to-noise ratio;
the functions of the closed loop tracking module are: and the received signal-to-noise ratio compensation module transmits the equivalent signal-to-noise ratios under different offset beams, selects the maximum value of the signal-to-noise ratio, selects offset angle information under the maximum signal-to-noise ratio, corrects the subsequent pointing angle and provides the information to the pointing correction module.
Second step program tracking module generates antenna pointing angle
The carrier position and posture module is used for measuring the position and posture information of the carrier, the information comprises UTC time, and the position and posture information of the carrier is continuously updated at the interval of delta t and is provided for the program tracking module. And simultaneously providing universal coordinated time (UTC time) information and a pulse level per second signal to the time sequence management module, wherein the minimum measurement unit of the UTC time information is second.
And after receiving the UTC time information, the time sequence management module generates a satellite tracking time sequence by taking the pulse per second signal as a reference, wherein the time sequence interval is delta t.
The ephemeris forecast module is based on the past time TXTo satellite bits for future UTC timeAnd (4) estimating the position information, wherein the estimated time precision is delta t, and transmitting the satellite position information to a program tracking module.
Taking the current UTC time and the pulse per second signal as the initial time T as the reference, the program tracking module acquires the satellite position information and the carrier position and attitude information at the time T to generate the tracking angle (phi) of the satellite1，θ1) Transmitting to a pointing correction module, and acquiring the latest satellite position information and the carrier position and attitude information at an interval of delta t to generate a tracking angle [ (phi) of the satelliten，θn)， n＝1，2，3……]And transmitting the data to the pointing correction module.
Third step of offset beam correction for beam scanning
At the initial moment T, no closed-loop tracking module corrects information, the pointing correction module works in an offset scanning mode, the pointing angle of a phased array antenna in the program tracking module is corrected according to offset beam angle information, the pointing correction module corrects the program tracking angle by angle correction information (0, 0), and the corrected pointing angle (phi)1，θ1) And controlling the phased array antenna to point to the satellite.
At the moment of T + delta T, no closed loop tracking module corrects information, the pointing correction module works in an offset scanning mode, the pointing correction module corrects the program tracking angle by the angle correction information (0, delta theta), and the corrected pointing angle (phi)2，θ2+ Δ θ) controls the phased array antenna to point at the satellite.
According to the above operation, at the time of T +2 Δ T, T +3 Δ T, T +4 Δ T, T +5 Δ T, T +6 Δ T, T +7 Δ T, T +8 Δ T, no closed loop tracking module correction information, the pointing correction module works in the offset scanning mode, the pointing correction module corrects the program tracking angle by the angle correction information (0, - Δ θ), (Δ Φ, 0), (- Δ Φ, 0), (Δ Φ/2, Δ θ/2), (- Δ Φ/2), - Δ θ/2), (Δ Φ/2, - Δ θ/2), (- Δ Φ/2, + Δ θ/2), and the corrected pointing angle (Φ/2)3，θ3-Δθ)、(Φ4+ΔΦ，θ4)、(Φ5-ΔΦ，θ5)、(Φ6+ΔΦ/2，θ6+Δθ/2)、(Φ7-ΔΦ/2，θ7-Δθ/2)、(Φ8+ΔΦ/2，θ8-Δθ/2)、(Φ9-ΔΦ/2，θ9+ Δ θ/2) respectively control the phased array antenna pointing at the corresponding time instant.
Fourthly, compensating equivalent signal-to-noise ratio under different pointing angles of the antenna
The method comprises the following steps that a phased array antenna increases along with a pitch angle theta deviating from a normal direction, the antenna gain decreases, and when an antenna directional diagram is tested, a compensation file of the antenna gain is generated according to the gain difference value between the phased array antenna and the normal direction at different pitch angles theta.
At the time of T + delta T, the signal-to-noise ratio receiving module obtains the direction (phi) of the antenna1，θ1) SNR of time1The signal-to-noise ratio compensation module is based on the pitch angle theta of the antenna1Query to antenna compensation Δ X1After compensating equivalent signal-to-noise ratio, the signal-to-noise ratio is SSNR1＝SNR1+ΔX1And feeding back to the closed loop tracking module.
At the time of T +2 delta T, the signal-to-noise ratio receiving module obtains the direction (phi) of the antenna2，θ2SNR at + Δ θ)2The signal-to-noise ratio compensation module is based on the pitch angle theta of the antenna2+ Δ θ query to antenna compensation Δ X2After compensating equivalent signal-to-noise ratio, the signal-to-noise ratio is SSNR2＝SNR2+ΔX2And feeding back to the closed loop tracking module.
According to the above operation, at the time of T +3 Δ T, T +4 Δ T, T +5 Δ T, T +6 Δ T, T +7 Δ T, T +8 Δ T, and T +9 Δ T, the snr receiving module obtains the antenna orientation (Φ)3，θ3-Δθ)、(Φ4+ΔΦ，θ4)、(Φ5-ΔΦ，θ5)、(Φ6+ΔΦ/2，θ6+Δθ/2)、 (Φ7-ΔΦ/2，θ7-Δθ/2)、(Φ8+ΔΦ/2，θ8-Δθ/2)、(Φ9-ΔΦ/2，θ9SNR at + Δ θ/2)3、SNR4、SNR5、 SNR6、SNR7、SNR8、SNR9The signal-to-noise ratio compensation module is based on the pitch angle theta of the antenna3-Δθ、θ4、θ5、θ6+Δθ/2、θ7-Δθ/2、θ8-Δθ/2、θ9+ Δ θ/2 query to antenna compensation Δ X3、ΔX4、ΔX5、ΔX6、ΔX7、ΔX8、ΔX9After compensating equivalent signal-to-noise ratio, the signal-to-noise ratio is SSNR3＝SNR3+ΔX3、SSNR4＝SNR4+ΔX4、SSNR5＝SNR5+ΔX5、SSNR6＝SNR6+ΔX6、SSNR7＝SNR7+ΔX7、SSNR8＝SNR8+ΔX8、SSNR9＝SNR9+ΔX9And feeding back to the closed loop tracking module.
Fifthly, performing closed loop tracking correction by equivalent signal-to-noise ratio comparison
At the time from T + delta T to T +9 delta T, the closed loop tracking module receives a zero offset beam (phi)1，θ1) And 8 offset beams (phi)2，θ2+Δθ)、(Φ3，θ3-Δθ)、(Φ4+ΔΦ，θ4)、(Φ5-ΔΦ，θ5)、(Φ6+ΔΦ/2，θ6+Δθ/2)、(Φ7-ΔΦ/2，θ7-Δθ/2)、 (Φ8+ΔΦ/2，θ8-Δθ/2)、(Φ9-ΔΦ/2，θ9Equivalent signal-to-noise ratio SSNR under + delta theta/2) pointing1、SSNR2、SSNR3、SSNR4、 SSNR5、SSNR6、SSNR7、SSNR8、SSNR9. Closed loop tracking module selects maximum signal-to-noise ratio SSNRxAnd inquiring corresponding pointing angle correction information (X, Y) from corresponding offset angles (0, 0), (0, delta theta), (0, -delta theta), (delta phi, 0), (-delta phi, 0), (delta phi/2, delta theta/2), (-delta phi/2, -delta theta/2), (delta phi/2, -delta theta/2) and (-delta phi/2, delta theta/2) and transmitting the corresponding pointing angle correction information (X, Y) to the pointing correction module.
At the time of T +10 delta T, correction information of the closed-loop tracking module is received, the pointing correction module works in a closed-loop tracking correction mode, and after the pointing correction module receives pointing angle correction information (X, Y) transmitted by the closed-loop tracking module, a program tracking angle (phi) is corrected10+X，θ10-Y) steering the phased array antenna towards the satellite.At the subsequent time, the pointing correction module corrects the program tracking angle [ (phi) according to the pointing angle correction information (X, Y)n+X，θn-Y)，n＝11，12，13……]And controlling the phased array antenna to point to the satellite.
Therefore, the closed-loop tracking of the phased array antenna low-orbit satellite is completed, and the tracking precision of the phased array antenna low-orbit satellite is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A satellite closed-loop tracking method for satellite low-orbit by satellite communication phased array antenna is characterized by comprising the following steps:
a phased array antenna low-orbit satellite closed-loop tracking system is built: the phased array antenna low-orbit satellite closed-loop tracking system comprises an ephemeris forecasting module, a time sequence management module, a carrier position and attitude module, a program tracking pointing module, a pointing correction module, a signal-to-noise ratio receiving module, a signal-to-noise ratio compensation module and a closed-loop tracking module; the program tracking pointing module and the closed loop tracking module are respectively connected with the pointing correction module; the ephemeris forecasting module and the carrier position and attitude module are respectively connected with the program tracking and pointing module; the signal-to-noise ratio receiving module is connected with the signal-to-noise ratio compensation module, and the signal-to-noise ratio compensation module is connected with the closed loop tracking module; the time sequence management module is connected with the program tracking and pointing module, the time sequence management module is connected with the pointing correction module, and the time sequence management module is connected with the closed loop tracking module;
generating an antenna pointing angle through a program tracking pointing module;
performing beam scanning through bias beam correction, and controlling the phased array antenna to point to a satellite through the corrected pointing angle;
performing equivalent signal-to-noise ratio compensation under different pointing angles of the antenna;
and carrying out closed loop tracking correction through equivalent signal-to-noise ratio comparison.
2. The closed-loop tracking method for satellite low-earth orbit of satellite by satellite flux phased array antenna as claimed in claim 1,
the closed loop tracking correction through equivalent signal-to-noise ratio comparison specifically comprises the following steps: the closed-loop tracking module receives the zero offset wave beam and the equivalent signal-to-noise ratio under the pointing of 8 offset wave beams, selects the corresponding offset angle under the maximum signal-to-noise ratio and transmits the offset angle to the pointing correction module, the pointing correction module works in a closed-loop tracking correction mode after receiving correction information of the closed-loop tracking module, and the phased array antenna is controlled to point to a satellite through the tracking angle of the correction program.
3. The closed-loop tracking method for the satellite with the satellite flux phased array antenna and the low earth orbit as claimed in claim 2, characterized in that in the step of generating the antenna pointing angle by the program tracking pointing module, the program tracking module acquires the latest satellite position information, carrier position information and attitude information to generate the tracking angle of the satellite and transmits the tracking angle to the pointing correction module by taking the current UTC time and pulse per second as the initial time T as the reference and delta T as the interval.
4. The closed-loop tracking method for the satellite with the satellite flux phased array antenna and the low earth orbit as claimed in claim 3, wherein the step of generating the antenna pointing angle through a program tracking pointing module is characterized in that a time sequence management module generates a satellite tracking time sequence with a time sequence interval of delta t by taking a pulse per second as a reference after receiving UTC time information.
5. The closed-loop tracking method for the satellite with the satellite low earth orbit of the satellite through the satellite phased array antenna as claimed in claim 4, wherein in the step of beam scanning through the offset beam correction, the pointing correction module works in an offset scanning mode, the pointing angle of the phased array antenna in the program tracking module is corrected according to the offset beam angle information, and the corrected pointing angle controls the phased array antenna to point to the satellite.
6. The closed-loop tracking method for the satellite in low orbit of the satellite with the satellite flux phased array antenna as claimed in claim 5, wherein in the step of performing equivalent signal-to-noise ratio compensation under different pointing angles of the antenna, the signal-to-noise ratio receiving module acquires the signal-to-noise ratio when the antenna points, the signal-to-noise ratio compensation module inquires antenna gain compensation according to the pitch angle of the antenna, and the calculated equivalent signal-to-noise ratio is fed back to the closed-loop tracking module.
7. The satellite closed-loop tracking method for the satellite in low orbit of the satellite flux phased array antenna as claimed in claim 6, wherein the antenna gain compensation inquired by the signal-to-noise ratio compensation module according to the pitch angle of the antenna is specifically as follows: the pitch angle of the phased array antenna is increased along with the deviation from the normal direction, the antenna gain is reduced, and when an antenna directional diagram is tested, the gain difference value in the direction opposite to (in) the normal direction is generated at different pitch angles, so that the compensation file of the antenna gain is generated.
8. The closed-loop tracking system for satellite low-orbit satellites with satellite through phased array antennas is characterized in that:
the program tracking pointing module and the closed loop tracking module are respectively connected with the pointing correction module; the ephemeris forecasting module and the carrier position and attitude module are respectively connected with the program tracking and pointing module; the signal-to-noise ratio receiving module is connected with the signal-to-noise ratio compensation module, and the signal-to-noise ratio compensation module is connected with the closed loop tracking module.
9. The closed-loop satellite tracking system with a satellite gate phased array antenna as claimed in claim 8, wherein the timing management module is connected with a program tracking pointing module, the timing management module is connected with a pointing correction module, and the timing management module is connected with a closed-loop tracking module.
10. The satellite closed-loop tracking system of satellite low earth orbit of satellite flux phased array antenna of claim 9,
the ephemeris forecast module is used for carrying out position estimation of the low-orbit satellite at the future moment;
the time sequence management module is used for carrying out time sequence management and synchronization of satellite tracking;
the carrier position and posture module is used for acquiring the position and posture information of the carrier at the current moment;
the program tracking and pointing module is used for resolving a pointing angle of the antenna according to the position of the satellite, the position of the carrier and the attitude information;
the pointing correction module is used for finishing correction of the pointing angle of the phased array antenna in the program tracking module and controlling the beam pointing of the phased array antenna;
the signal-to-noise ratio receiving module is used for acquiring the signal-to-noise ratio of the satellite signal under the current satellite tracking angle;
the signal-to-noise ratio compensation module is used for performing gain compensation and calculating to obtain an equivalent signal-to-noise ratio;
and the closed loop tracking module is used for selecting the offset angle information under the maximum signal-to-noise ratio and correcting the pointing angle.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116107348A (en) * | 2023-04-14 | 2023-05-12 | 国网冀北电力有限公司 | Method and device for tracking low-orbit satellite by unmanned aerial vehicle antenna |
| CN116545517A (en) * | 2023-07-07 | 2023-08-04 | 青岛国数信息科技有限公司 | Stable and effective Beidou communication-in-motion antenna dual-mode tracking control method |
| CN117193383A (en) * | 2023-11-08 | 2023-12-08 | 成都天锐星通科技有限公司 | Low-orbit satellite tracking method based on phased array antenna |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116107348A (en) * | 2023-04-14 | 2023-05-12 | 国网冀北电力有限公司 | Method and device for tracking low-orbit satellite by unmanned aerial vehicle antenna |
| CN116545517A (en) * | 2023-07-07 | 2023-08-04 | 青岛国数信息科技有限公司 | Stable and effective Beidou communication-in-motion antenna dual-mode tracking control method |
| CN116545517B (en) * | 2023-07-07 | 2023-09-26 | 青岛国数信息科技有限公司 | Stable and effective Beidou communication-in-motion antenna dual-mode tracking control method |
| CN117193383A (en) * | 2023-11-08 | 2023-12-08 | 成都天锐星通科技有限公司 | Low-orbit satellite tracking method based on phased array antenna |
| CN117193383B (en) * | 2023-11-08 | 2024-02-06 | 成都天锐星通科技有限公司 | Low-orbit satellite tracking method based on phased array antenna |
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