System for confirming correctness of space target tracked by sea-based mobile aerospace observation station in real time

Abstract

The invention relates to a sea-based mobile aerospace observation station tracking space target correctness real-time confirmation system, and belongs to the technical field. Comprising a parameter configuration module, a space target library management module, a sea-based equipment antenna horizontal coordinate system angle pointing calculation module, an antenna pointing peripheral target screening module and a data display module. The parameter configuration module is used for configuring parameters used by the system, the space target library management module is used for completing creation and management of a space target library, and the sea-based equipment antenna horizontal coordinate system angle pointing calculation module is used for converting a measurement value under a sea-based equipment platform measurement coordinate system; the antenna pointing peripheral target screening module is used for screening targets in a given angle range; and the data display module is used for displaying information in real time. Whether the target pointed by the current tracking equipment antenna is the target to be tracked or not can be confirmed in real time, the working efficiency is improved, and the risk of mistakenly tracking the target is reduced.

Description

Technical Field

[0001] The invention relates to a real-time confirmation system for the correctness of tracking space targets by a sea-based mobile aerospace measuring station, belonging to the technical field of sea-based tracking equipment. Background Art

[0002] Tracking transiting space targets and obtaining accurate measurement information of targets is one of the daily important tasks of sea-based mobile aerospace stations. The space target tracking process is as follows: use the latest orbital elements of the tracked target to extrapolate the current position of the target; combine the current position of the sea-based mobile aerospace station to calculate the observation angle of the target in the sea-based platform's horizontal coordinate system; through the swing attitude data of the sea-based mobile platform, convert the observation angle in the sea-based platform's horizontal coordinate system to the observation angle of the sea-based platform tracking device's measurement system; finally, manipulate the tracking device antenna to point to the measurement system's observation angle to capture the tracked target. At present, there are tens of thousands of artificial space targets orbiting in low-Earth orbit. It is inevitable that multiple targets will appear simultaneously in the antenna beam of the sea-based tracking device, which increases the risk of operators not being able to track targets and reduces the efficiency of sea-based mobile stations in tracking space targets. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a real-time confirmation system for the correctness of space target tracking by a sea-based mobile aerospace station in response to the above-mentioned prior art, which can confirm in real time whether the target pointed to by the antenna of the current tracking device is the target to be tracked, thereby improving the work efficiency of the sea-based mobile station in normalizing and long-term tracking of space targets and reducing the risk of operators tracking the wrong target.

[0004] The technical solution adopted by the present invention to solve the above-mentioned problem is: a real-time confirmation system for the correctness of space target tracking by a sea-based mobile aerospace measuring station, comprising a parameter configuration module, a space target library management module, a sea-based equipment antenna horizontal coordinate system angle pointing calculation module, an antenna pointing peripheral target screening module and a data display module; the parameter configuration module is used to configure the parameters used by the system, the space target library management module is used to complete the creation and management of the space target library, the sea-based equipment antenna horizontal coordinate system angle pointing calculation module is used to convert the measurement value under the sea-based equipment platform measurement coordinate system; the antenna pointing peripheral target screening module is used to compare the angle information of the visible target with the current pointing of the sea-based equipment antenna, and screen out the target within a given angle range; the data display module is used to display the information of all space targets within a specified range around the current pointing of the sea-based equipment antenna in real time, and refresh the display in real time.

[0005] The parameter configuration module includes setting space target information, antenna surrounding query angle range, data query frequency, and orbit epoch extrapolation threshold.

[0006] The antenna periphery query angle range is 8-12 times of the tracking device antenna beam width; the data query frequency is one traversal query per second; the orbit epoch extrapolation threshold is 5-8 days or 85-95 days.

[0007] The space object library management module imports the object library file pushed by the task center or the double-line root number file downloaded from the Internet, generates or updates the space object library, and completes the creation and management of the space object library.

[0008] The sea-based equipment antenna horizontal coordinate system angle pointing calculation module:

[0009] The measurement data output by the sea-based equipment is the measurement value in the measurement coordinate system of the sea-based equipment platform. Combined with the attitude data of the sea-based measurement platform, the angle pointing of the horizontal coordinate system is obtained through the coordinate conversion formula. The conversion formula for converting the measurement data output by the sea-based equipment into the angle pointing of the horizontal coordinate system of the sea-based equipment antenna is:

[0010]

[0011] in,

[0012] (xyz) c The rectangular coordinates of the device measurement coordinate system,

[0013] (x0 y0 z0) is the coordinate of the device in the horizontal system,

[0014] (xyz) g is the rectangular coordinate of the horizontal system, that is, the angle direction of the horizontal coordinate system;

[0015] B c is the Euler angle rotation matrix of the sea-based platform attitude.

[0016] Sea-based platforms will produce displacement and swaying motion in the ocean due to the action of external forces such as wind and waves. Various equipment on the sea-based platform are affected by the swaying motion, and it is necessary to perform N-point data polynomial filtering on the swaying attitude data of the sea-based platform.

[0017] The screening process of the antenna pointing to the surrounding target screening module:

[0018] Step 1: Preprocess all targets in the target library;

[0019] Step 2: By filtering the epoch time, the targets whose orbital root epoch time and current time difference value exceeds the orbital epoch extrapolation threshold are eliminated to obtain the first target subset;

[0020] Step 3: Traverse the first target subset once every minute, calculate the angle pointing of the sea-based platform to all visible targets in the first target subset at the current moment, and retain the targets with visible elevation angles above -15° to form the second target subset;

[0021] Step 4: Traverse the second target subset once per second, calculate the angle pointing of the sea-based platform to all visible targets in the second target subset at the current moment, and retain the targets whose angles with the current pointing angles of the sea-based platform tracking device antenna are less than the query angle range to form a third target subset;

[0022] Step 5: All targets in the third target subset are sorted from small to large according to the angle between them and the antenna, and the antenna pointing to the surrounding targets is obtained in real time.

[0023] In the step 2, the next screening action needs to be pre-processed after the time difference from the last screening exceeds 1 minute.

[0024] The display modes of the data display module are graphic display, list display and table display.

[0025] Compared with the prior art, the advantages of the present invention are: a real-time confirmation system for the correctness of space target tracking by a sea-based mobile aerospace station, firstly, constructs a space target library; then, the current pointing direction of the sea-based equipment antenna is converted into the angle pointing direction of the antenna's horizontal coordinate system through a coordinate conversion formula; then, the space target library is traversed according to the angle pointing direction of the antenna's horizontal coordinate system, and space targets within a certain angle range around the antenna pointing are screened out; and the screened target information is displayed in real time. The present application proposes a method for rapid hierarchical screening of targets, and for all targets in the space target library, pre-processing operations such as epoch time filtering and target elevation filtering are performed at a relatively low query frequency to form a target subset; for all targets in the above target subset, angle filtering is performed at a relatively high query frequency to obtain targets around the antenna pointing in real time. The present application can confirm in real time whether the target that the current tracking device antenna is pointing to is the target to be tracked, which improves the work efficiency of the sea-based mobile station in normalizing and long-term tracking of space targets, and reduces the risk of operators mis-tracking targets. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a flow chart of screening antenna pointing to surrounding targets in a real-time confirmation system for correctness of space target tracking by a sea-based mobile aerospace station according to an embodiment of the present invention;

[0027] Figure 2 The data display module displays the antenna pointing to the surrounding target screening result graph. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] A real-time confirmation system for the correctness of space target tracking by a sea-based mobile aerospace station in this embodiment includes a parameter configuration module, a space target library management module, a sea-based equipment antenna horizontal coordinate system angle pointing calculation module, an antenna pointing peripheral target screening module and a data display module.

[0030] Parameter configuration module: configure the parameters used by the system. The parameter configuration module includes setting space target information, antenna surrounding query angle range, data query frequency, and orbit epoch extrapolation threshold. The antenna surrounding query angle range is used to control the number of displayed surrounding targets. If the angle range is too large, the more targets are displayed, and the interface displays too many targets, which is not conducive to observation. If the angle range is too small, it is impossible to display the change trend of the antenna pointing to the surrounding targets. Generally, the angle range value can be set to 10 times the antenna beam width of the tracking device, or the angle range is 5°. The data query frequency is used to control the calculation interval of traversing the space target library to query the antenna pointing to the surrounding targets. It is generally set to traverse and query once per second. The orbit epoch extrapolation threshold is used to pre-screen space targets when traversing space targets. The target trajectory data is extrapolated from the target orbit root epoch time. As the extrapolation time becomes longer, the target trajectory extrapolation accuracy gradually decreases; when the extrapolation time exceeds the set threshold, it can be considered that the extrapolation result is unreliable, and such targets are eliminated during target pre-screening. For low-orbit targets, the extrapolation threshold is generally set to 7 days, and for medium and high-orbit targets, the extrapolation threshold is set to about 3 months. The space target library management module is used to complete the creation and management of the space target library. The angle pointing calculation module of the sea-based equipment antenna horizontal coordinate system is used to convert the measurement value under the sea-based equipment platform measurement coordinate system; the antenna pointing surrounding target screening module is used to compare the angle information of the visible target with the current pointing of the sea-based equipment antenna, and screen out the targets within a given angle range; the data display module is used to display in real time the information of all space targets within the specified range around the current pointing of the sea-based equipment antenna, and refresh the display in real time according to the set value.

[0031] Space target library management module: import the target library file pushed by the mission center or the double-line root number file downloaded from the Internet, generate or update the space target library, and complete the creation and management of the space target library. One-click update of space target library information is convenient. As shown in Table 1, this table stores the basic information of all space targets.

[0032] Table 1 Space target table

[0033] Column Name type Remark Domestic Number VARCHAR(8) Domestic number, such as: 106379 NORAD Number VARCHAR(8) NORAD id, such as 25544 Launch year number VARCHAR(16) Launch year number, such as: 1998-067A English name VARCHAR(64) English name, such as: ISS (ZARYA) Chinese name VARCHAR(128) Chinese name, such as: International Space Station Complex (Dawn) nation VARCHAR(64) Country, such as China Launch Date VARCHAR(16) Launch date, such as: 1998-11-20 Root epoch VARCHAR(24) Root epoch, such as: 2022 / 06 / 05 21:59:30 Orbital period DOUBLE Orbital period, in minutes, such as: 92.9099 Perigee height DOUBLE Perigee height, in km, e.g. 411 Apogee altitude DOUBLE Apogee height, in km, e.g. 423 Orbital inclination DOUBLE Orbital inclination, unit: °, such as: 51.64 LINE1 VARCHAR(72) LINE1, line 1 of TLE format LINE2 VARCHAR(72) LINE2, line 2 in TLE format

[0034] All space target information can be quickly updated using a variety of external files, ensuring accurate query of the antenna pointing to surrounding targets.

[0035] Module for calculating the angle pointing of the horizontal coordinate system of the antenna of the sea-based equipment: The output measurement data of the sea-based equipment is the measurement value under the measurement coordinate system of the sea-based equipment platform. Combined with the attitude data of the sea-based measurement platform, the angle pointing of the horizontal coordinate system of the antenna of the sea-based equipment is obtained through the coordinate conversion formula. Due to the influence of waves, wind, etc., the attitude data of the sea-based platform changes rapidly, and the attitude data of the sea-based platform needs to be processed by N-point data polynomial filtering to ensure the accuracy of the angle pointing of the horizontal coordinate system converted from the measurement coordinate system of the sea-based equipment platform, and to ensure the correctness of the calculation of the horizontal system pointing of the antenna of the sea-based equipment.

[0036] The conversion formula for the angle pointing of the horizontal coordinate system of the sea-based equipment antenna is:

[0037]

[0038] in,

[0039] (xyz) c The rectangular coordinates of the device measurement coordinate system,

[0040] (x0 y0 z0) is the coordinate of the device in the horizontal system,

[0041] (xyz) g is the horizontal rectangular coordinate,

[0042] B c is the Euler angle rotation matrix of the sea-based platform attitude.

[0043] Antenna pointing to surrounding target screening module: traverse all targets in the space target table, calculate the visibility of the sea-based platform to the target, compare the angle information of the visible target with the current direction of the sea-based equipment antenna, and screen out the targets within a given angle range. This method has high screening efficiency and meets the real-time computing requirements during the tracking process.

[0044] like Figure 1 As shown in the figure, the screening process of the antenna pointing to the surrounding target screening module is as follows:

[0045] Step 1: When receiving the antenna pointing to the surrounding target screening request, when it is used for the first time, all targets in the target library are directly preprocessed; if the antenna pointing to the surrounding target screening module is not the first operation, it is necessary to preprocess again after an interval of more than 1 minute from the last preprocessing.

[0046] Step 2: By filtering the epoch time, the targets whose orbital root epoch time and current time difference value exceeds the orbital epoch extrapolation threshold are eliminated to obtain the first target subset.

[0047] Step 3: Traverse the first target subset once every minute, calculate the angle pointing of the sea-based platform to all visible targets in the first target subset at the current moment through the above conversion formula, and retain the targets with visible elevation angles above -15° to form the second target subset.

[0048] Step 4: Traverse the second target subset once per second, calculate the angle pointing of the sea-based platform to all visible targets in the second target subset at the current moment through the above conversion formula, and retain the targets whose target pointing angle with the current pointing angle of the sea-based platform tracking device antenna is less than the query angle range to form a third target subset.

[0049] Step 5: All targets in the third target subset are sorted from small to large according to the angle between them and the antenna, and the antenna pointing to the surrounding targets is obtained in real time.

[0050] Data display module: The data display module is used to display in real time the information of all space targets within the specified range currently pointed to by the sea-based equipment antenna; and refresh the display in real time according to the set value. The display mode includes three parts: graphic display, list display, and table display. Figure 2 As shown in the figure, the left part is the graphic display part, which shows the distribution of all targets within the specified range around the current antenna; the upper right part is the list display part, which shows the brief information of all targets within the specified range around the current antenna, and the targets are sorted from small to large according to the angle between the target direction and the current antenna direction; the lower right part is the table display part, which shows the detailed information of the currently selected target, and the information of the target with the smallest angle (i.e. the currently tracked target) is displayed by default. Click the satellite icon in the graphic display part, or select the target in the list display part, and the detailed information of the selected target can be displayed in the table display part. The intuitive real-time display of the data display module can help the operator confirm whether the target currently pointed by the antenna is the target to be tracked, effectively preventing mistracking.

[0051] First, a space target library is constructed; then, the current pointing direction of the sea-based equipment antenna is converted into the angular pointing direction of the antenna's horizontal coordinate system through a coordinate conversion formula; then, the space target library is traversed according to the angular pointing direction of the antenna's horizontal coordinate system, and space targets within a certain angle range around the antenna are screened out; and the screened target information is displayed in real time. This application proposes a method for rapid hierarchical screening of targets, and for all targets in the space target library, epoch time filtering, target elevation filtering and other pre-processing operations are performed at a relatively low query frequency (query once per minute) to form a target subset; for all targets in the above target subset, angle filtering is performed at a relatively high query frequency (query once per second) to obtain targets around the antenna pointing in real time. This application can confirm in real time whether the target that the current tracking device antenna is pointing to is the target to be tracked, which improves the work efficiency of normalizing and long-term tracking of space targets by sea-based mobile stations, and reduces the risk of operators mis-tracking targets.

[0052] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A real-time confirmation system for the correctness of tracking space targets by a sea-based mobile aerospace station, characterized by: It includes a parameter configuration module, a space target library management module, a sea-based equipment antenna horizontal coordinate system angle pointing calculation module, an antenna pointing surrounding target screening module and a data display module; the parameter configuration module is used to configure the parameters used by the system, the space target library management module is used to complete the creation and management of the space target library, the sea-based equipment antenna horizontal coordinate system angle pointing calculation module is used to convert the measurement value under the sea-based equipment platform measurement coordinate system; the antenna pointing surrounding target screening module is used to compare the angle information of the visible target with the current pointing of the sea-based equipment antenna, and screen out the target within a given angle range; the data display module is used to display the information of all space targets within a specified range around the current pointing of the sea-based equipment antenna in real time, and refresh the display in real time.

2. A real-time confirmation system for the correctness of tracking space targets by a sea-based mobile aerospace station according to claim 1, characterized in that: The parameter configuration module includes setting space target information, antenna surrounding query angle range, data query frequency, and orbit epoch extrapolation threshold.

3. The real-time confirmation system for the correctness of tracking space targets by a sea-based mobile aerospace station according to claim 2 is characterized by: The antenna periphery query angle range is 8-12 times of the tracking device antenna beam width; the data query frequency is one traversal query per second; the orbit epoch extrapolation threshold is 5-8 days or 85-95 days.

4. The real-time confirmation system for the correctness of tracking space targets by a sea-based mobile aerospace station according to claim 1 is characterized by: The space object library management module imports the object library file pushed by the task center or the double-line root number file downloaded from the Internet, generates or updates the space object library, and completes the creation and management of the space object library.

5. The real-time confirmation system for the correctness of tracking space targets by a sea-based mobile aerospace station according to claim 1 is characterized by: The sea-based equipment antenna horizontal coordinate system angle pointing calculation module: The measurement data output by the sea-based equipment is the measurement value in the measurement coordinate system of the sea-based equipment platform. Combined with the attitude data of the sea-based measurement platform, the angle pointing in the horizontal coordinate system is obtained through the coordinate conversion formula. The conversion formula for converting the measurement data output by the sea-based equipment into the angle pointing in the horizontal coordinate system of the sea-based equipment antenna is: in, (xyz) c The rectangular coordinates of the device measurement coordinate system, (x0 y0 z0) is the coordinate of the device in the horizontal system, (xyz) g is the horizontal rectangular coordinate, B c is the Euler angle rotation matrix of the sea-based platform attitude.

6. The real-time confirmation system for the correctness of tracking space targets by a sea-based mobile aerospace station according to claim 1 is characterized by: Sea-based platforms will produce displacement and swaying motion in the ocean due to the action of external forces such as wind and waves. Various equipment on the sea-based platform are affected by the swaying motion, and it is necessary to perform N-point data polynomial filtering on the swaying attitude data of the sea-based platform.

7. The real-time confirmation system for the correctness of tracking space targets by a sea-based mobile aerospace station according to claim 1 is characterized by: The antenna points to the screening process of the surrounding target screening module: Step 1: Preprocess all targets in the target library; Step 2: By filtering the epoch time, the targets whose orbital root epoch time and current time difference value exceeds the orbital epoch extrapolation threshold are eliminated to obtain the first target subset; Step 3: Traverse the first target subset once every minute, calculate the angle pointing of the sea-based platform to all visible targets in the first target subset at the current moment, and retain the targets with visible elevation angles above -15° to form the second target subset; Step 4: Traverse the second target subset once per second, calculate the angle pointing of the sea-based platform to all visible targets in the second target subset at the current moment, and retain the targets whose angles with the current pointing angles of the sea-based platform tracking device antenna are less than the query angle range to form a third target subset; Step 5: All targets in the third target subset are sorted from small to large according to the angle between them and the antenna, and the antenna pointing to the surrounding targets is obtained in real time.

8. The real-time confirmation system for the correctness of tracking space targets by a sea-based mobile aerospace station according to claim 7 is characterized by: In the step 2, the next screening action needs to be pre-processed after the time difference from the last screening exceeds 1 minute.

9. The real-time confirmation system for the correctness of tracking space targets by a sea-based mobile aerospace station according to claim 1 is characterized by: The display modes of the data display module are graphic display, list display and table display.

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