CN113315567A - Telemetering scheduling method based on two-stage packet system - Google Patents
Telemetering scheduling method based on two-stage packet system Download PDFInfo
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Abstract
The invention provides a telemetering scheduling method based on a two-stage packet system, which comprises the following steps: the telemetry sub-packet scheduling module performs parameter scheduling on the telemetry sub-packets according to various combinations and transmission algorithms of different telemetry sub-packets in each telemetry packet so as to optimize protocol design and scheduling algorithms, meet the telemetry requirements of different subsystems, different satellite-borne equipment, various satellite-borne software and the like, and ensure stable on-orbit operation of the satellite; the telemetry packet scheduling module performs channel transmission scheduling of the telemetry packets according to the scheduling period and the transmission algorithm of each telemetry packet so as to optimize protocol design and the scheduling algorithm under the condition of limited channel communication rate, meet the telemetry requirements of different subsystems, different satellite-borne equipment, various satellite-borne software and the like, and ensure the on-orbit stable operation of the satellite.
Description
Technical Field
The invention relates to the technical field of satellite telemetry, in particular to a telemetry scheduling method based on a two-stage packet system.
Background
With the rapid development of electronic technology and software technology, satellite design gradually tends to be software-based from hardware, which brings about a multiple increase of satellite telemetry parameters, and the satellite-ground channel telemetry rate generally becomes a constraint condition in system telemetry design. Under the condition of limited channel communication rate, namely under the constraint of multiple channels and different information rates of a satellite, the type of the satellite telemetry parameters is complex, and the requirements of telemetry periods are different, and under the condition of limited information transmission rate, the existing telemetry packet scheduling algorithm is difficult to meet the requirements of the telemetry periods of different telemetry parameters.
Disclosure of Invention
The invention aims to provide a telemetry scheduling method based on a two-stage packet system, which aims to solve the problem that the existing telemetry packet scheduling algorithm is difficult to meet the telemetry period of different telemetry parameters.
In order to solve the technical problem, the invention provides a telemetry scheduling method based on a two-stage packet system, which comprises the following steps:
the telemetry sub-packet scheduling module performs parameter scheduling on the telemetry sub-packets according to various combinations and transmission algorithms of different telemetry sub-packets in each telemetry packet so as to optimize protocol design and scheduling algorithms, meet the telemetry requirements of different subsystems, different satellite-borne equipment, various satellite-borne software and the like, and ensure stable on-orbit operation of the satellite;
the telemetry packet scheduling module performs channel transmission scheduling of the telemetry packets according to the scheduling period and the transmission algorithm of each telemetry packet so as to optimize protocol design and the scheduling algorithm under the condition of limited channel communication rate, meet the telemetry requirements of different subsystems, different satellite-borne equipment, various satellite-borne software and the like, and ensure the on-orbit stable operation of the satellite.
Optionally, in the telemetry scheduling method based on the two-stage packet system, the method further includes:
sorting various telemetry parameters of the satellite, and combining the same telemetry period and/or the correlated parameters into a telemetry sub-packet, so as to facilitate uniform scheduling;
the telemetry sub-packets in each telemetry packet are distributed by combining the channel transmission rate and the channel characteristics, so that the telemetry packet transmission is ensured to meet the telemetry period requirement of the telemetry sub-packets;
the scheduling period and the transmission algorithm of the telemetering packet are comprehensively calculated by combining the channel transmission rate and the channel characteristics, and the scheduling period of the telemetering packet is ensured not to exceed the limit of the channel transmission rate;
calculating the channel occupancy rate, and ensuring that the channel occupancy rate is smaller than the channel transmission rate limit to prevent data loss;
the occupancy of the channel is the sum of the occupancy of the channels of the individual telemetry packets.
Optionally, in the telemetry scheduling method based on the two-stage packet system, the method further includes:
each telemetry packet comprises 3 telemetry sub-packets, the data field length of each telemetry packet is 192 bytes, and the data field length of each telemetry sub-packet is 64 bytes.
Optionally, in the telemetry scheduling method based on the two-stage packet system, the method further includes:
the parameters of channel 1 include: the communication rate is 32Kbps, the number of the telemetering packet communication packets is 16 packets/s, and the channel period is 1 s;
the parameters of channel 2 include: the communication rate is 2Kbps, the number of the telemetering packet communication packets is 1 packet/s, and the channel period is 1 s;
the parameters of channel 3 include: the communication rate is 2Kbps, the number of the telemetry packet communication packets is 3 packets/3 s, and the channel period is 3 s.
Optionally, in the telemetry scheduling method based on the two-stage packet system, the channel 1 telemetry packet scheduling algorithm includes:
acquiring a telemetry period of each telemetry sub-packet, and acquiring a scheduling period requirement of the telemetry sub-packet in a telemetry mode of a channel 1;
listing the data field composition of each telemetering packet, wherein each telemetering packet is formed by combining 3 telemetering sub-packets, and different combinations of the sub-packets are designed according to the telemetering parameter downloading period requirements of the telemetering sub-packets; the telemetry sub-packets with the same telemetry period form a telemetry packet;
the telemetering packet transmission under the channel 1 condition adopts a priority mode, short-period packets are transmitted preferentially, and the priority is lower when the period is longer;
combining the design result of the transmission algorithm, the telemetry sub-packet downloading period in each telemetry packet meets the sub-packet telemetry requirement;
according to the scheduling period of each telemetry packet, the comprehensive channel occupancy rate is 3.5625, the channel margin is 12.4375, and the margin in the actual satellite design is small;
when the telemetering packet scheduling period is designed to be smaller than the limit of 16 packets/s under the channel constraint condition, the data is prevented from being lost.
Optionally, in the telemetry scheduling method based on the two-stage packet system, the channel 2 telemetry packet scheduling algorithm includes:
in a telemetry mode of a channel 2, acquiring a scheduling period requirement of a telemetry sub-packet, wherein the mode is characterized in that other telemetry sub-packets are downloaded under the condition of ensuring that the scheduling period of the sub-packet is 1 second, and other sub-packets have no forced scheduling period requirement;
the mode telemetry cycle includes: 1 st gear: the scheduling period of the sub-packets 79 and 80 is 1 second, and the 2 nd stage: other sub-packets ensure transmission without mandatory period requirements;
listing the data field composition of each telemetry packet, wherein each telemetry packet is formed by combining 3 sub-packets, and different combinations of the sub-packets are designed according to the telemetry parameter downloading period requirements of the sub-packets;
in each telemetering packet, a 1 st telemetering sub-packet is preferentially arranged, and the rest telemetering sub-packets are alternately arranged to a 2 nd telemetering sub-packet;
the 1 st and 2 nd sub-packets in each telemetry packet are identical, fixed as sub-packets 79 and 80, and the 3 rd sub-packet fills other sub-packets according to telemetry requirements.
Optionally, in the telemetry scheduling method based on the two-stage packet system, the channel 2 telemetry packet scheduling algorithm includes:
channel 2 capacity is 1 packet per second, and the minimum transmission length constrained by the link layer packet protocol is 1 packet, so that the telemetering packet adopts a fixed downloading mode and has 1 packet per second;
combining the design result of the transmission algorithm, the sub-packet downloading period in each telemetry packet meets the telemetry requirement of the sub-packet;
according to the scheduling period of each telemetry packet, the comprehensive channel occupancy rate is 1, and the channel constraint condition is achieved.
Optionally, in the telemetry scheduling method based on the two-stage packet system, the channel 3 telemetry packet scheduling algorithm includes:
in a telemetry mode of a channel 3, the scheduling period requirement of a telemetry sub-packet is acquired, and the telemetry scheduling period in the mode is mainly divided into 3 stages:
1 st gear: the scheduling period of the sub-packet 36 is 1 second;
the 2 nd gear: the scheduling period of partial sub-packets is 6 s; and
3, gear: other sub-packets meet the downloading requirement, and the scheduling period does not make strict requirements;
listing the data field composition of each telemetry packet, wherein each telemetry packet is formed by combining 3 sub-packets, and different combinations of the sub-packets are designed according to the telemetry parameter downloading period requirements of the sub-packets;
the channel is characterized in that the transmission period is 3 seconds, so that the telemetry packet adopts a 6-packet collaborative design mode, and each 6 packets comprise 3 periods:
1 gear cycle: the 1 st sub-packet in each telemetry packet is a 1 st sub-packet 36;
2, gear period: configuring a sub-packet required by the 2 nd telemetry cycle in the first 3 telemetry packets 169, 170 and 171; and
and 3, a gear period: the last 3 telemetry packets are padded with other subpackets.
Optionally, in the telemetry scheduling method based on the two-stage packet system, the channel 3 telemetry packet scheduling algorithm includes:
the channel scheduling mode is that 3 packets are sent once every 3s, the channel capacity is 3 packets/3 s, the transmission algorithm is designed in integral multiple of 3 seconds, and the algorithm adopts 6s period to carry out fixed mode transmission;
generating a telemetry packet every second, and in each 6s period, fixing the first 3s to transmit the telemetry packets 169, 170 and 171, and respectively transmitting the other telemetry packets in sequence in the last 3 s;
combining the design result of the transmission algorithm, the sub-packet downloading period in each telemetry packet meets the sub-packet telemetry requirement;
according to the scheduling period of each telemetry packet, the comprehensive channel occupancy rate is 1, and the channel constraint condition is achieved.
In the telemetry scheduling method based on the two-stage packet system, channel transmission scheduling of the telemetry packets is carried out through the telemetry packet scheduling module according to the scheduling period and the transmission algorithm of each telemetry packet, and the telemetry packet scheduling module carries out parameter scheduling of the telemetry packets according to various combinations and transmission algorithms of different telemetry packets in each telemetry packet, so that the telemetry requirements of different subsystems, different satellite-borne equipment, various satellite-borne software and the like can be met by optimizing protocol design and scheduling algorithms, and the stable on-orbit operation of a satellite is ensured; satellite designers can meet the telemetering requirements of different subsystems, different satellite-borne equipment, various satellite-borne software and the like by optimizing protocol design and scheduling algorithm under the condition of limited channel communication rate, and provide reference for satellite telemetering design.
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Fig. 1 is a schematic diagram of a telemetry scheduling method based on a two-stage packet system according to an embodiment of the present invention.
Detailed Description
The telemetry scheduling method based on the two-stage packetization system provided by the invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Furthermore, features from different embodiments of the invention may be combined with each other, unless otherwise indicated. For example, a feature of the second embodiment may be substituted for a corresponding or functionally equivalent or similar feature of the first embodiment, and the resulting embodiments are likewise within the scope of the disclosure or recitation of the present application.
The core idea of the invention is to provide a telemetry scheduling method based on a two-stage packet system, so as to solve the problem that the existing telemetry packet scheduling algorithm is difficult to meet the telemetry period of different telemetry parameters.
In order to realize the idea, the invention provides a telemetering scheduling method based on a two-stage packet system, which comprises the following steps: the telemetry packet scheduling module is configured to perform channel transmission scheduling of the telemetry packets according to the scheduling period and the transmission algorithm of each telemetry packet; and a telemetry sub-packet scheduling module configured to perform parameter scheduling of telemetry sub-packets according to a plurality of combinations and transmission algorithms of different telemetry sub-packets within each telemetry packet; wherein each of the telemetry packets comprises a plurality of telemetry sub-packets.
The invention adopts telemetry design and scheduling algorithm based on a two-stage packet system, and is flexible in scheduling, wherein a first-stage packet is called a telemetry packet, and the length of a data field adopts 192 bytes; the secondary packet is called a telemetry sub-packet, and the data length adopts 64 bytes; each telemetry packet is formed by combining 3 telemetry sub-packets. The telemetry scheduling algorithm is designed by comprehensively adopting a two-stage sub-packet and scheduling mechanism of a telemetry packet and a telemetry sub-packet, as shown in fig. 1: the telemetry packet completes channel transmission scheduling, and the channel transmission scheduling is completed through the scheduling period and the transmission algorithm of each telemetry packet. And the parameter scheduling is completed through various combinations and transmission algorithms of different telemetry sub-packets in each telemetry packet.
The telemetering scheduling algorithm is mainly realized by the following steps:
the telemetry sub-package design and scheduling period requirement analysis comprises the following steps: various telemetry parameters of the satellite are sorted, and the parameters with the same telemetry period and mutual correlation are combined into a telemetry sub-packet, so that unified scheduling is facilitated.
Secondly, the telemetry sub-packet allocation algorithm in the telemetry packet comprises the following steps: and reasonably distributing the telemetry sub-packets in each telemetry packet by combining the channel transmission rate and the channel characteristics, so that the telemetry packet transmission can meet the telemetry period requirement of the telemetry sub-packets.
Thirdly, the telemetry packet channel transmission algorithm comprises the following steps: the scheduling period and the transmission algorithm of the telemetering packet are designed comprehensively by combining the channel transmission rate and the channel characteristics, and the limit of the channel transmission rate is not exceeded.
Fourthly, analyzing the channel occupancy rate and the channel margin comprises the following steps: the occupancy of the channel is the sum of the occupancy of the channel for each packet. When the telemetry scheduling algorithm is designed, the channel occupancy rate needs to be considered, the limitation of the channel transmission rate is ensured not to be exceeded, and the data is ensured not to be lost.
The embodiment of the present invention is illustrated by the following 3 types of channels, and the communication rate, the channel capacity, and the channel period (channel characteristics) of each type of channel are shown in table 1.
Table 1 channel constraints
| Channel name | Rate of communication | Channel capability (number of telemetry packet communication packets) | Channel period |
| Channel 1 | 32Kbps | 16 bags/s | 1s |
| Channel 2 | 2Kbps | 1 pack/s | 1s |
| Channel 3 | 2Kbps | 3 pack/3 s | 3s |
In a first embodiment, the channel 1 telemetry packet scheduling algorithm is as follows:
(1) telemetry sub-package design and scheduling period requirement analysis:
the telemetry period for each telemetry sub-packet is obtained, and in the telemetry mode of channel 1, the scheduling period requirements for the telemetry sub-packets are shown in table 2.
(2) Telemetry sub-packet assignment algorithm within a telemetry packet:
table 3 lists the data field composition of each telemetry packet by way of example, which is formed by combining 3 telemetry sub-packets, and different combinations of sub-packets are designed according to the telemetry parameter downloading period requirements of the telemetry sub-packets. Telemetry sub-packets having the same telemetry period form a telemetry packet (e.g., telemetry sub-packets 35, 36, 84 form telemetry packet 122).
(3) Telemetry packet channel transmission algorithm:
the telemetry packet transmission under the channel 1 condition adopts a priority mode, short-period packets are transmitted preferentially, and the priority is distributed as shown in table 4 when the period is longer and the priority is lower.
By combining the design result of the transmission algorithm, the telemetry sub-packet downloading period in each telemetry packet is shown in table 2, and the sub-packet telemetry requirements can be met.
(4) Analyzing the channel occupancy rate and the channel margin:
according to the scheduling period of each telemetry packet in table 3, the comprehensive channel occupancy rate is 3.5625, the channel margin is 12.4375, and the margin in the actual satellite design is small; the telemetry packet scheduling period should be designed to be less than the 16 packet/s limit under the channel constraints, otherwise data will be lost.
TABLE 2 telemetry sub-packet scheduling period
| Serial number | Telemetering sub-package | Telemetry cycle (seconds) |
| 1、 | Sub-packet 35 | 1 |
| 2、 | Sub-packet 36 | 1 |
| 3、 | Sub-packet 84 | 1 |
| 4、 | Sub-packet 38 | 4 |
| 5、 | Sub-packet 39 | 4 |
| 6、 | Sub-packet 40 | 4 |
| 7、 | Sub-packet 25 | 1 |
| 8、 | Sub-packet 26 | 1 |
| 9、 | Sub-packet 80 | 1 |
| 10、 | Sub-packet 11 | 4 |
| 11、 | Sub-packet 13 | 4 |
| 12、 | Sub-packet 14 | 4 |
| 13、 | Sub-packet 79 | 1 |
| 14、 | Sub-packet 2 | 1 |
| 15、 | Sub-packet 116 | 1 |
| 16、 | Sub-packet 30 | 16 |
| 17、 | Sub-packet 31 | 16 |
| 18、 | Sub-packet 32 | 16 |
TABLE 3 telemetry packet scheduling algorithm
TABLE 4 telemetry packet transmission priority
In a second embodiment, the channel 2 telemetry packet scheduling algorithm includes:
(1) telemetry sub-package design and scheduling period requirement analysis:
in the telemetry mode of the channel 2, the scheduling period requirement of the telemetry sub-packet is shown in table 5, and the mode is characterized in that other telemetry sub-packets are downloaded under the condition that the scheduling periods of the sub-packets 79 and the sub-packets 80 are ensured to be 1 second, and the other sub-packets have no mandatory scheduling period requirement.
The mode telemetry cycle is mainly divided into 2 steps:
1 st gear: the scheduling period of the sub-packets 79 and 80 is 1 second;
the 2 nd gear: other subpackets ensure transmission without mandatory period requirements.
(2) Telemetry sub-packet assignment algorithm within a telemetry packet:
table 6 shows, by way of example, the data field composition of each telemetry packet, which is formed by combining 3 sub-packets, and different combinations of sub-packets are designed according to the telemetry parameter download period requirements of the sub-packets. In each telemetry packet, the 1 st telemetry sub-packet is preferably arranged, and the remaining 2 nd telemetry sub-packets are arranged in turn. In this embodiment, the 1 st and 2 nd sub-packets in each telemetry packet are identical, fixed as sub-packet 79 and sub-packet 80, and the 3 rd sub-packet fills the other sub-packets according to the telemetry requirements.
(3) Telemetry packet channel transmission algorithm:
the channel capacity is 1 packet per second, and the minimum transmission length of the link layer packet protocol constraint is 1 packet, so the telemetry packet adopts a fixed downlink mode, 1 packet per second, as shown in table 7.
And combining the design result of the transmission algorithm, the sub-packet downloading period in each telemetry packet is shown in the table 5, and the telemetry requirement of the sub-packets can be met.
(4) Analyzing the channel occupancy rate and the channel margin:
from the scheduling period of table 6 for each telemetry packet, the aggregate duty cycle is 1, just meeting the channel constraint.
TABLE 5 telemetry sub-packet scheduling period
| Serial number | Telemetering sub-package | Telemetry cycle (seconds) | Telemetering periodic gear |
| 1、 | Sub-packet 79 | 1 | 1 st gear |
| 2、 | Sub-packet 80 | 1 | 1 st gear |
| 3、 | Sub-packet 1 | 5 | 2-gear |
| 4、 | Sub-packet 2 | 5 | 2-gear |
| 5、 | Sub-packet 3 | 5 | 2-gear |
| 6、 | Sub-packet 4 | 5 | 2-gear |
| 7、 | Sub-packet 5 | 5 | 2-gear |
TABLE 6 telemetry packet scheduling Algorithm
TABLE 7 telemetry packet Transmission Algorithm
In a third embodiment, the channel 3 telemetry packet scheduling algorithm includes:
(1) telemetry sub-package design and scheduling period requirement analysis:
in the telemetry mode of channel 3, the scheduling period requirement of the telemetry sub-packets is shown in table 8, and the telemetry scheduling period in the mode is mainly divided into 3:
1 st gear: the scheduling period of the sub-packet 36 is 1 second;
the 2 nd gear: the scheduling period of partial sub-packets is 6 s;
3, gear: other sub-packets meet the downloading requirement, and the scheduling period does not make strict requirements.
(2) Telemetry sub-packet assignment algorithm within a telemetry packet:
table 9 shows, by way of example, the data field composition of each telemetry packet, which is formed by combining 3 sub-packets, and different combinations of sub-packets are designed according to the telemetry parameter download period requirements of the sub-packets.
The channel is characterized in that the transmission period is 3 seconds, so that the telemetry packet adopts a 6-packet collaborative design mode, and each 6 packets comprise 3 periods:
1 gear cycle: the 1 st sub-packet in each telemetry packet is a 1 st sub-packet 36;
2, gear period: configuring a sub-packet required by the 2 nd telemetry cycle in the first 3 telemetry packets 169, 170 and 171;
and 3, a gear period: the last 3 telemetry packets are padded with other subpackets.
(3) Telemetry packet channel transmission algorithm:
the channel scheduling mode is that 3 packets are sent once every 3s, the channel capacity is 3 packets/3 s, the transmission algorithm is designed in integral multiple of 3 seconds, and the algorithm adopts 6s period to carry out fixed mode transmission.
One telemetry packet is generated per second, and during each 6s period, the first 3s of the session transmit telemetry packets 169, 170, 171, and the last 3s transmit other telemetry packets in turn, respectively, as shown in table 10.
And combining the design result of the transmission algorithm, the sub-packet downloading period in each telemetry packet is shown in the table 8, and the sub-packet telemetry requirement can be met.
(4) Analyzing the channel occupancy rate and the channel margin:
from the scheduling period of table 9 for each telemetry packet, the aggregate duty cycle is 1, just meeting the channel constraint.
TABLE 8 telemetry sub-packet scheduling period
| Serial number | Telemetering sub-package | Telemetry cycle (seconds) | Telemetering periodic gear |
| 1、 | Sub-packet 36 | 1 | 1 st gear |
| 2、 | Sub-packet 35 | 6 | 2-gear |
| 3、 | Sub-packet 81 | 6 | 2-gear |
| 4、 | Sub-packet 84 | 6 | 2-gear |
| 5、 | Sub-packet 82 | 6 | 2-gear |
| 6、 | Sub-packet 4 | 6 | 2-gear |
| 7、 | Sub-packet 83 | 6 | 2-gear |
| 8、 | Sub-packet 38 | 18 | 3 grade |
| 9、 | Sub-packet 39 | 18 | 3 grade |
| 10、 | Sub-packet 40 | 18 | 3 grade |
| 11、 | Sub-packet 41 | 18 | 3 grade |
| 12、 | Sub-packet 42 | 18 | 3 grade |
| 13、 | Sub-packet 43 | 18 | 3 grade |
| 14、 | Sub-packet 44 | 18 | 3 grade |
| 15、 | Sub-packet 118 | 18 | 3 grade |
| 16、 | Sub-packet 2 | 18 | 3 grade |
| 17、 | Sub-packet 3 | 18 | 3 grade |
| 18、 | Sub-packet 37 | 18 | 3 grade |
| 19、 | Sub-packet 50 | 18 | 3 grade |
| 20、 | Sub-packet 56 | 18 | 3 grade |
| 21、 | Sub-packet 57 | 18 | 3 grade |
| 22、 | Sub-packet 5 | 18 | 3 grade |
| 23、 | Sub-packet 6 | 18 | 3 grade |
| 24、 | Sub-packet 7 | 18 | 3 grade |
| 25、 | Sub-packet 8 | 18 | 3 grade |
TABLE 9 telemetry packet scheduling algorithm
TABLE 10 telemetry packet Transmission Algorithm
In the telemetry scheduling method based on the two-stage packet system, channel transmission scheduling of the telemetry packets is carried out through the telemetry packet scheduling module according to the scheduling period and the transmission algorithm of each telemetry packet, and the telemetry packet scheduling module carries out parameter scheduling of the telemetry packets according to various combinations and transmission algorithms of different telemetry packets in each telemetry packet, so that the telemetry requirements of different subsystems, different satellite-borne equipment, various satellite-borne software and the like can be met by optimizing protocol design and scheduling algorithms, and the stable on-orbit operation of a satellite is ensured; satellite designers can meet the telemetering requirements of different subsystems, different satellite-borne equipment, various satellite-borne software and the like by optimizing protocol design and scheduling algorithm under the condition of limited channel communication rate, and provide reference for satellite telemetering design.
The embodiment of the invention also provides a telemetering scheduling system based on a two-stage subpackage system, which comprises the following steps: the telemetry packet scheduling module is configured to perform channel transmission scheduling of the telemetry packets according to the scheduling period and the transmission algorithm of each telemetry packet; and a telemetry sub-packet scheduling module configured to perform parameter scheduling of telemetry sub-packets according to a plurality of combinations and transmission algorithms of different telemetry sub-packets within each telemetry packet; wherein each of the telemetry packets comprises a plurality of telemetry sub-packets.
In an embodiment of the present invention, in the telemetry scheduling method based on the two-stage packetization system, the method further includes: and the telemetry sub-packet design and scheduling period requirement analysis module is configured to sort various telemetry parameters of the satellite, and combine the same telemetry period and/or the correlated parameters into a telemetry sub-packet, so that unified scheduling is facilitated.
In an embodiment of the present invention, in the telemetry scheduling method based on the two-stage packetization system, the method further includes: and the telemetry sub-packet distribution algorithm module in the telemetry packet is configured to distribute the telemetry sub-packets in each telemetry packet by combining the channel transmission rate and the channel characteristics, so that the telemetry packet transmission is ensured to meet the telemetry period requirement of the telemetry sub-packets.
In an embodiment of the present invention, in the telemetry scheduling method based on the two-stage packetization system, the method further includes: and the telemetry packet channel transmission algorithm module is configured to comprehensively calculate the scheduling period and the transmission algorithm of the telemetry packet by combining the channel transmission rate and the channel characteristics, and simultaneously ensure that the scheduling period of the telemetry packet does not exceed the channel transmission rate limit.
In an embodiment of the present invention, in the telemetry scheduling method based on the two-stage packetization system, the method further includes: the channel occupancy rate and channel margin analysis module is configured to calculate the channel occupancy rate and ensure that the channel occupancy rate is smaller than the channel transmission rate limit so as to prevent data loss; the occupancy of the channel is the sum of the occupancy of the channels of the individual telemetry packets.
In an embodiment of the present invention, in the telemetry scheduling method based on the two-stage packetization system, the method further includes: each telemetry packet comprises 3 telemetry sub-packets, the data field length of each telemetry packet is 192 bytes, and the data field length of each telemetry sub-packet is 64 bytes.
The embodiment of the invention also provides a satellite telemetering scheduling method based on the multichannel constraint condition, which comprises the following steps: the telemetry packet scheduling module performs channel transmission scheduling of the telemetry packets according to the scheduling period and the transmission algorithm of each telemetry packet; the telemetry sub-packet scheduling module schedules parameters of the telemetry sub-packets according to various combinations and transmission algorithms of different telemetry sub-packets in each telemetry packet; wherein each of the telemetry packets comprises a plurality of telemetry sub-packets.
In summary, the above embodiments have described in detail different configurations of the telemetry scheduling method based on the two-stage packetization system, but it is understood that the present invention includes, but is not limited to, the configurations listed in the above embodiments, and any configuration that is transformed based on the configurations provided in the above embodiments is within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (9)
1. A telemetry scheduling method based on a two-stage packet system is characterized by comprising the following steps:
the telemetry sub-packet scheduling module performs parameter scheduling on the telemetry sub-packets according to various combinations and transmission algorithms of different telemetry sub-packets in each telemetry packet so as to optimize protocol design and scheduling algorithms, meet the telemetry requirements of different subsystems, different satellite-borne equipment, various satellite-borne software and the like, and ensure stable on-orbit operation of the satellite;
the telemetry packet scheduling module performs channel transmission scheduling of the telemetry packets according to the scheduling period and the transmission algorithm of each telemetry packet so as to optimize protocol design and the scheduling algorithm under the condition of limited channel communication rate, meet the telemetry requirements of different subsystems, different satellite-borne equipment, various satellite-borne software and the like, and ensure the on-orbit stable operation of the satellite.
2. The telemetry scheduling method based on the two-stage packetization system according to claim 1, further comprising:
sorting various telemetry parameters of the satellite, and combining the same telemetry period and/or the correlated parameters into a telemetry sub-packet, so as to facilitate uniform scheduling;
the telemetry sub-packets in each telemetry packet are distributed by combining the channel transmission rate and the channel characteristics, so that the telemetry packet transmission is ensured to meet the telemetry period requirement of the telemetry sub-packets;
the scheduling period and the transmission algorithm of the telemetering packet are comprehensively calculated by combining the channel transmission rate and the channel characteristics, and the scheduling period of the telemetering packet is ensured not to exceed the limit of the channel transmission rate;
calculating the channel occupancy rate, and ensuring that the channel occupancy rate is smaller than the channel transmission rate limit to prevent data loss;
the occupancy of the channel is the sum of the occupancy of the channels of the individual telemetry packets.
3. The telemetry scheduling method based on the two-stage packetization system according to claim 2, further comprising:
each telemetry packet comprises 3 telemetry sub-packets, the data field length of each telemetry packet is 192 bytes, and the data field length of each telemetry sub-packet is 64 bytes.
4. The telemetry scheduling method based on the two-stage packetization system according to claim 3, further comprising:
the parameters of channel 1 include: the communication rate is 32Kbps, the number of the telemetering packet communication packets is 16 packets/s, and the channel period is 1 s;
the parameters of channel 2 include: the communication rate is 2Kbps, the number of the telemetering packet communication packets is 1 packet/s, and the channel period is 1 s;
the parameters of channel 3 include: the communication rate is 2Kbps, the number of the telemetry packet communication packets is 3 packets/3 s, and the channel period is 3 s.
5. The telemetry scheduling method based on the two-stage packetization system according to claim 4, wherein the channel 1 telemetry packet scheduling algorithm comprises:
acquiring a telemetry period of each telemetry sub-packet, and acquiring a scheduling period requirement of the telemetry sub-packet in a telemetry mode of a channel 1;
listing the data field composition of each telemetering packet, wherein each telemetering packet is formed by combining 3 telemetering sub-packets, and different combinations of the sub-packets are designed according to the telemetering parameter downloading period requirements of the telemetering sub-packets; the telemetry sub-packets with the same telemetry period form a telemetry packet;
the telemetering packet transmission under the channel 1 condition adopts a priority mode, short-period packets are transmitted preferentially, and the priority is lower when the period is longer;
combining the design result of the transmission algorithm, the telemetry sub-packet downloading period in each telemetry packet meets the sub-packet telemetry requirement;
according to the scheduling period of each telemetry packet, the comprehensive channel occupancy rate is 3.5625, the channel margin is 12.4375, and the margin in the actual satellite design is small;
when the telemetering packet scheduling period is designed to be smaller than the limit of 16 packets/s under the channel constraint condition, the data is prevented from being lost.
6. The telemetry scheduling method based on the two-stage packetization system according to claim 4, wherein the channel 2 telemetry packet scheduling algorithm comprises:
in a telemetry mode of a channel 2, acquiring a scheduling period requirement of a telemetry sub-packet, wherein the mode is characterized in that other telemetry sub-packets are downloaded under the condition of ensuring that the scheduling period of the sub-packet is 1 second, and other sub-packets have no forced scheduling period requirement;
the mode telemetry cycle includes: 1 st gear: the scheduling period of the sub-packets 79 and 80 is 1 second, and the 2 nd stage: other sub-packets ensure transmission without mandatory period requirements;
listing the data field composition of each telemetry packet, wherein each telemetry packet is formed by combining 3 sub-packets, and different combinations of the sub-packets are designed according to the telemetry parameter downloading period requirements of the sub-packets;
in each telemetering packet, a 1 st telemetering sub-packet is preferentially arranged, and the rest telemetering sub-packets are alternately arranged to a 2 nd telemetering sub-packet;
the 1 st and 2 nd sub-packets in each telemetry packet are identical, fixed as sub-packets 79 and 80, and the 3 rd sub-packet fills other sub-packets according to telemetry requirements.
7. The telemetry scheduling method based on the two-stage packetization system according to claim 6, wherein the channel 2 telemetry packet scheduling algorithm comprises:
channel 2 capacity is 1 packet per second, and the minimum transmission length constrained by the link layer packet protocol is 1 packet, so that the telemetering packet adopts a fixed downloading mode and has 1 packet per second;
combining the design result of the transmission algorithm, the sub-packet downloading period in each telemetry packet meets the telemetry requirement of the sub-packet;
according to the scheduling period of each telemetry packet, the comprehensive channel occupancy rate is 1, and the channel constraint condition is achieved.
8. The telemetry scheduling method based on the two-stage packetization system according to claim 4, wherein the channel 3 telemetry packet scheduling algorithm comprises:
in a telemetry mode of a channel 3, the scheduling period requirement of a telemetry sub-packet is acquired, and the telemetry scheduling period in the mode is mainly divided into 3 stages:
1 st gear: the scheduling period of the sub-packet 36 is 1 second;
the 2 nd gear: the scheduling period of partial sub-packets is 6 s; and
3, gear: other sub-packets meet the downloading requirement, and the scheduling period does not make strict requirements;
listing the data field composition of each telemetry packet, wherein each telemetry packet is formed by combining 3 sub-packets, and different combinations of the sub-packets are designed according to the telemetry parameter downloading period requirements of the sub-packets;
the channel is characterized in that the transmission period is 3 seconds, so that the telemetry packet adopts a 6-packet collaborative design mode, and each 6 packets comprise 3 periods:
1 gear cycle: the 1 st sub-packet in each telemetry packet is a 1 st sub-packet 36;
2, gear period: configuring a sub-packet required by the 2 nd telemetry cycle in the first 3 telemetry packets 169, 170 and 171; and
and 3, a gear period: the last 3 telemetry packets are padded with other subpackets.
9. The telemetry scheduling method based on the two-stage packetization system according to claim 8, wherein the channel 3 telemetry packet scheduling algorithm comprises:
the channel scheduling mode is that 3 packets are sent once every 3s, the channel capacity is 3 packets/3 s, the transmission algorithm is designed in integral multiple of 3 seconds, and the algorithm adopts 6s period to carry out fixed mode transmission;
generating a telemetry packet every second, and in each 6s period, fixing the first 3s to transmit the telemetry packets 169, 170 and 171, and respectively transmitting the other telemetry packets in sequence in the last 3 s;
combining the design result of the transmission algorithm, the sub-packet downloading period in each telemetry packet meets the sub-packet telemetry requirement;
according to the scheduling period of each telemetry packet, the comprehensive channel occupancy rate is 1, and the channel constraint condition is achieved.
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