Transponder autonomous reset method suitable for micro-nano satellite

Abstract

The invention relates to a transponder autonomous reset method suitable for a micro-nano satellite. The method specifically comprises the following steps: S1, setting a timer in a transponder; s2, the timer starts timing from 0, and the reading per second is increased by 1; s3, according to the fact that timing of the timer reaches a reset timing threshold value, the responder conducts continuous interpretation of the locking state within the locking interpretation time; s4, judging that the number of times of continuous locking abnormal states reaches a reset locking interpretation threshold value, if so, automatically resetting the responder, otherwise, not resetting; and S5, resetting the timer, and executing the step S2. The method can be applied to responders with different measurement and control systems and frequency bands; under the condition that the normal measurement and control service of the micro-nano satellite is not influenced, the autonomous recovery capability of the responder in a single-particle fault state is enhanced, and the intervention frequency of a ground measurement and control station is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of satellite transponders, and in particular to an autonomous resetting method of a transponder applicable to a micro-nano satellite. Background Art

[0002] Micro-nano satellites have the characteristics of low orbit, small size, low power consumption, light weight, low cost, and short development cycle. Micro-nano satellites use industrial-grade and general military-grade components, which are easily affected by the space environment and produce single-particle effects. Typical single-particle soft errors are single-particle soft errors that cause electronic system logic disorder, instruction errors, function interruptions, and logic anomalies, thus affecting the normal functions and services of spacecraft. The contradiction between the development cost of micro-nano satellites and the adaptability to the space radiation environment is the main problem that low-level components need to solve when used in space.

[0003] Most micro-nano satellites are low-orbit satellites. Due to the number of ground tracking and control stations and the coverage of tracking and control, the daily time of micro-nano satellites during their in-orbit operation is limited. Ground tracking and control personnel are unable to monitor and handle on-board faults in a timely manner. Satellite in-orbit faults may affect the normal implementation of satellite in-orbit missions and even cause catastrophic consequences. It is of great significance to study the autonomous processing of single-particle effect faults by micro-nano satellites in orbit to ensure their reliability in the high-energy particle radiation environment of space.

[0004] As one of the core modules of the satellite, the transponder is responsible for the communication between the satellite and the ground, and completes functions such as remote control, telemetry, ranging and speed measurement, and high-speed uplink. Whether it works properly will directly affect the realization of the entire satellite function. Therefore, the reliability of the transponder in the micro-nano satellite is crucial.

[0005] According to the characteristics of micro-nano satellites, their internal transponders have the characteristics of low cost, high integration and complex functions. At present, micro-nano satellite transponders use FPGA to realize signal processing functions, but FPGA is easily affected by the space environment and single particle effect occurs, causing the transponder to malfunction in orbit. Summary of the invention

[0006] In order to solve the technical problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method and system for autonomous resetting of transponders suitable for micro-nano satellites, which can be applicable to transponders of different measurement and control systems and frequency bands; without affecting the normal measurement and control services of the micro-nano satellite, the autonomous recovery capability of the transponder under the single-particle fault state is enhanced, and the frequency of intervention by the ground measurement and control station is reduced.

[0007] To achieve the above-mentioned object of the invention, the present invention provides a method for autonomously resetting a transponder applicable to a micro-nano satellite, which specifically includes:

[0008] Step S1, setting a timer inside the answering machine;

[0009] Step S2, the timer starts counting from 0, and the reading increases by 1 per second;

[0010] Step S3, when the timer reaches a reset timing threshold, the transponder continuously reads the lock state within the lock reading time;

[0011] Step S4, determining whether the number of consecutive lock abnormal states reaches the reset lock judgment threshold, if so, the transponder is reset autonomously, otherwise it is not reset;

[0012] Step S5, clear the timer and execute step S2.

[0013] According to a technical solution of the present invention, the reset timing threshold is 2 hours.

[0014] According to a technical solution of the present invention, the autonomous reset operation includes: clearing registers other than FPGA working status parameters.

[0015] According to a technical solution of the present invention, the core components of the transponder are components that are sensitive to SEU.

[0016] According to a technical solution of the present invention, in step S3, the transponder continuously reads the lock state within the lock reading time period, specifically including:

[0017] Step S31, set the number of readings N=0, and the number of abnormal state locking COUNT=0;

[0018] Step S32, judging whether the transponder is locked according to the locking criterion and the reading frequency; if so, executing step S33, otherwise executing step S34;

[0019] Step S33, set the number of readings N=N+1;

[0020] Step S34, set the number of readings N=N+1, and the number of abnormal state locking times COUNT=COUNT+1;

[0021] Step S35, determining whether the lock abnormal state times COUNT is greater than or equal to the reset lock judgment threshold, if so, executing step S4, otherwise, executing step S36;

[0022] Step S36, determine whether the number of readings N is greater than the reading time threshold, if so, execute step S5, otherwise execute step S32.

[0023] According to a technical solution of the present invention, the judgment time threshold is equal to the ratio of the lock judgment time to the judgment frequency.

[0024] According to a technical solution of the present invention, the lock determination time is 1 minute, and the reset lock determination threshold is 45 times.

[0025] According to a technical solution of the present invention, the transponder includes a non-coherent spread spectrum transponder or a unified carrier measurement and control transponder; the locking criterion is:

[0026] For non-coherent spread spectrum transponders, the locking criterion is "remote control bit synchronization lock" or "measurement frame synchronization lock"; the transponder uplink locking criterion, for unified carrier measurement and control transponders, the locking criterion is "carrier lock".

[0027] According to a technical solution of the present invention, in the step S5, it also includes: clearing the number of judgments N and the number of abnormal state locking COUNT.

[0028] According to a technical solution of the present invention, the step S1 further includes: designing an autonomous reset enable instruction inside the transponder; the autonomous reset enable instruction is autonomous reset enable permission or autonomous reset enable prohibition;

[0029] The step S2 also includes: reading the autonomous reset enable instruction, and if the autonomous reset enable instruction is autonomous reset enable permission, the timer starts timing, otherwise it does not count.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The method for autonomous resetting a transponder applicable to a micro-nano satellite provided by the present invention determines the locking state of the transponder when the internal timer of the transponder reaches the reset timing threshold, and autonomously resets the transponder when the number of consecutive locking times of the transponder exceeds the threshold, thereby ensuring that the autonomous reset scenario is that the satellite is in an overseas area, thereby not affecting the normal measurement and control business of the satellite during transit.

[0032] The present invention adopts command control to enable the self-reset of the transponder, and can flexibly switch and set the self-reset working condition of the transponder, with strong usability. The present invention can be applied to transponders of SEU-sensitive components, conforms to the actual on-orbit working conditions of micro-nano satellites, can enhance the self-recovery ability of the transponder when affected by a single particle, and reduces the frequency of ground intervention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A flowchart schematically showing a method for autonomous resetting a transponder applicable to a micro-nano satellite provided in accordance with one embodiment of the present invention;

[0035] Figure 2 The flowchart schematically shows a method for autonomous resetting a transponder applicable to a micro-nano satellite according to another aspect of the present invention. DETAILED DESCRIPTION

[0036] The description of the embodiments of this specification should be combined with the corresponding drawings, which should be considered as part of the complete specification. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated for simplification or convenience. Furthermore, the parts of each structure in the drawings will be described separately. It is worth noting that the elements not shown in the drawings or not described in words are in a form known to ordinary technicians in the relevant technical field.

[0037] The description of the embodiments herein and any reference to directions and orientations are only for the convenience of description and are not to be construed as any limitation on the scope of protection of the present invention. The following description of the preferred embodiments may involve combinations of features, which may exist independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0038] like Figure 1 As shown, the present invention provides a transponder autonomous reset method applicable to a micro-nano satellite, which specifically includes:

[0039] Step S1, setting a timer inside the answering machine;

[0040] Step S2, the timer starts from 0, and the reading increases by 1 per second;

[0041] Step S3, when the timer reaches the reset timing threshold, the transponder continuously reads the lock state within the lock reading time;

[0042] Step S4, determining whether the number of consecutive lock abnormal states reaches the reset lock judgment threshold, if so, the transponder is reset autonomously, otherwise it is not reset;

[0043] Step S5, reset the timer and execute step S2.

[0044] Through the above steps, the micro-nano satellite transponder can be autonomously reset at a fixed period. At the same time, according to the number of consecutive abnormal lock states within the lock judgment time reaching the reset lock judgment threshold, the present invention determines that the micro-nano satellite is in the extraterritorial space, so as to realize the autonomous reset of the satellite in the extraterritorial space of the satellite, which will not affect the normal measurement and control business of the micro-nano satellite, can significantly enhance the autonomous recovery capability of the transponder under the single-particle fault state, reduce the intervention frequency of the ground measurement and control station, improve the single-particle fault state processing capability of the micro-nano satellite, and improve the operation stability of the micro-nano satellite.

[0045] like Figure 2 As shown, in one embodiment of the present invention, a transponder autonomous reset method applicable to a micro-nano satellite of the present invention has the following specific processing flow:

[0046] Step S1, setting a timer inside the answering machine;

[0047] An autonomous reset enable instruction is designed inside the transponder; the autonomous reset enable instruction is autonomous reset enable permission or autonomous reset enable prohibition;

[0048] A 1-bit telemetry "autonomous reset enable flag" is designed inside the transponder; the autonomous reset enable flag is defined as follows: 1b is allowed, 0b is prohibited;

[0049] A transponder uplink locking criterion is designed inside the transponder; the transponder includes a non-coherent spread spectrum transponder or a unified carrier measurement and control transponder; for the non-coherent spread spectrum transponder, the locking criterion is "remote control bit synchronization lock" or "measurement frame synchronization lock"; for the unified carrier measurement and control transponder, the locking criterion is "carrier lock". The transponder uplink locking criterion is "remote control bit synchronization lock" or "measurement frame synchronization lock".

[0050] Step S2, the timer starts from 0, and the reading increases by 1 per second;

[0051] A timer is set inside the answering machine. The timer increases by 1 per second. The default timer is 0 when the answering machine is powered on.

[0052] Step S3, when the timer reaches the reset timing threshold, the transponder continuously reads the lock state within the lock reading time;

[0053] The reset timer threshold is 2 hours.

[0054] In step S3, the transponder performs continuous determination of the lock state within the lock determination time period, specifically including:

[0055] Step S31, set the number of readings N=0, and the number of abnormal state locking COUNT=0;

[0056] Step S32, judging whether the transponder is locked according to the locking criteria and the reading frequency; if so, executing step S33, otherwise executing step S34;

[0057] Step S33, set the number of readings N=N+1;

[0058] Step S34, set the number of readings N=N+1, and the number of abnormal state locking times COUNT=COUNT+1;

[0059] The locking criterion is judged inside the transponder. If the locking criterion is locked, the N count is increased by 1. If the locking criterion is unlocked, the N count is increased by 1 and the COUNT count is increased by 1.

[0060] Step S35, determining whether the lock abnormal state times COUNT is greater than or equal to the reset lock judgment threshold, if so, executing step S4, otherwise, executing step S36;

[0061] Step S36, determine whether the number of readings N is greater than the reading time threshold, if so, execute step S5, otherwise execute step S32.

[0062] The interpretation time threshold is equal to the ratio of the lock interpretation time to the interpretation frequency.

[0063] The lock judgment time is 1 minute, and the reset lock judgment threshold is 45 times.

[0064] The transponder reads once per second; the transponder reads the telemetry "autonomous reset enable flag" every second. If the flag is 1b, the timer in step S2 starts. After the timer is full for 2 hours, the transponder reads the lock criteria 60 times, once per second. If the lock abnormal state count COUNT exceeds 45, it resets itself. If COUNT is less than or equal to 45, the timer and the reading times N and the lock abnormal state count COUNT are cleared.

[0065] Step S4, determining whether the number of consecutive lock abnormal states reaches the reset lock judgment threshold, if so, the transponder is reset autonomously, otherwise it is not reset;

[0066] The core components of the transponder are components that are sensitive to SEU.

[0067] The autonomous reset operation includes clearing the registers other than the FPGA working state parameters. The transponder reset does not change its working state, such as the transmitter switch, the autonomous reset enable flag, etc.

[0068] Step S5, reset the timer and execute step S2.

[0069] It should be noted that the above is a preferred embodiment of the present invention. It should be pointed out that although the preferred embodiment of the present invention has been described, once the basic creative concept of the present invention is known, a number of improvements and modifications can be made by a person skilled in the art without departing from the principles of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. Therefore, the attached claims are intended to be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the embodiments of the present invention.

Claims

1. A method for autonomously resetting a transponder for a micro-nano satellite, characterized in that: Specifically include: Step S1, setting a timer inside the answering machine; Step S2, the timer starts counting from 0, and the reading increases by 1 per second; Step S3, when the timer reaches a reset timing threshold, the transponder continuously reads the lock state within the lock reading time; Step S4, determining whether the number of consecutive lock abnormal states reaches the reset lock judgment threshold, if so, the transponder is reset autonomously, otherwise it is not reset; Step S5, clear the timer and execute step S2.

2. The method for autonomous resetting of a transponder applicable to a micro-nano satellite according to claim 1, characterized in that: The reset timing threshold is 2 hours.

3. The method for autonomous resetting of a transponder applicable to a micro-nano satellite according to claim 1, characterized in that: The autonomous reset operation includes: performing a zero clearing operation on registers other than the FPGA working state parameters.

4. The method for autonomous resetting of a transponder applicable to a micro-nano satellite according to claim 1, characterized in that: The core components of the transponder are components that are sensitive to SEU.

5. The method for autonomous resetting of a transponder applicable to a micro-nano satellite according to claim 1, characterized in that: In step S3, the transponder continuously reads the lock state within the lock reading time period, specifically including: Step S31, set the number of readings N=0, and the number of abnormal state locking COUNT=0; Step S32, judging whether the transponder is locked according to the locking criterion and the reading frequency; if so, executing step S33, otherwise executing step S34; Step S33, set the number of readings N=N+1; Step S34, set the number of readings N=N+1, and the number of abnormal state locking times COUNT=COUNT+1; Step S35, determining whether the lock abnormal state times COUNT is greater than or equal to the reset lock judgment threshold, if so, executing step S4, otherwise, executing step S36; Step S36, determine whether the number of readings N is greater than the reading time threshold, if so, execute step S5, otherwise execute step S32.

6. The method for autonomous resetting of a transponder applicable to a micro-nano satellite according to claim 5, characterized in that: The judgment time threshold is equal to the ratio of the lock judgment time to the judgment frequency.

7. The method for autonomous resetting of a transponder applicable to a micro-nano satellite according to claim 6, characterized in that: The lock determination time is 1 minute, and the reset lock determination threshold is 45 times.

8. The method for autonomous resetting of a transponder applicable to a micro-nano satellite according to claim 5, characterized in that: The transponder includes a non-coherent spread spectrum transponder or a unified carrier measurement and control transponder; the locking criterion is: For the non-coherent spread spectrum transponder, the locking criterion is "remote control bit synchronization lock" or "measurement frame synchronization lock"; the transponder uplink locking criterion, for the unified carrier measurement and control transponder, the locking criterion is "carrier lock".

9. The method for autonomous resetting of a transponder applicable to a micro-nano satellite according to claim 5, characterized in that: In the step S5, it also includes: clearing the number of determinations N and the number of abnormal state locking COUNT.

10. The method for autonomous resetting of a transponder applicable to a micro-nano satellite according to claim 5, characterized in that: The step S1 also includes: designing an autonomous reset enable instruction inside the transponder; the autonomous reset enable instruction is autonomous reset enable permission or autonomous reset enable prohibition; The step S2 also includes: reading the autonomous reset enable instruction, and if the autonomous reset enable instruction is autonomous reset enable permission, the timer starts timing, otherwise it does not count.

Images