CN112087456A - Telemetry data processing method, device and system for complex satellite load - Google Patents
Telemetry data processing method, device and system for complex satellite load Download PDFInfo
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- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
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Abstract
The invention provides a method, a device and a system for processing telemetry data facing complex satellite loads, which relate to the technical field of remote sensing satellite information processing, are applied to a load controller and comprise the following steps: firstly, receiving a first type fixed-length data packet sent by at least one sub-load; then receiving a compression reference table uploaded by the ground operation control system; then, the first type fixed-length data packet is compressed and merged based on the compression reference table to obtain a second type fixed-length data packet; and finally, sending the second type fixed-length data packet to the ground operation control system so that the ground operation control system decompresses the second type fixed-length data packet into the first type fixed-length data packet, and updating the compression reference table based on the first type fixed-length data packet. The compression reference table is updated in real time in the ground operation control system based on the first type of fixed-length data packet and then uploaded to the load controller, so that the load remote control method can adapt to the change of load remote control definition in different design stages.
Description
Technical Field
The invention relates to the technical field of remote sensing satellite information processing, in particular to a method, a device and a system for processing remote sensing data for complex satellite loads.
Background
The telemetry data is satellite basic health data, the telemetry link is a channel for downloading the satellite telemetry data, and the rate of the telemetry link is generally less than 10 Kbps. In recent years, with the progress of electronic technology, the functions and density of satellites are higher, the load capable of being carried by a single satellite is higher, and the rate of telemetry data is higher. It is becoming increasingly important to compress telemetry data using a data compression method to transmit more effective telemetry data over a limited telemetry link. The traditional telemetry data processing method uses a fixed compression mode and cannot adapt to the change of load telemetry definition in different design stages.
Disclosure of Invention
The invention aims to provide a telemetry data processing method, a device and a system for complex satellite loads, so as to solve the technical problem that the traditional telemetry data processing method in the prior art cannot adapt to the change of load telemetry definitions at different design stages in a fixed compression mode.
In a first aspect, the present invention provides a telemetry data processing method for complex satellite loads, where the telemetry data processing method is applied to a load controller, and includes: receiving a first type fixed-length data packet sent by at least one sub-load; wherein the first type of fixed-length data packet is used to represent telemetry data to be compressed; receiving a compression reference table uploaded by a ground operation control system; compressing and merging the first type fixed-length data packet based on the compression reference table to obtain a second type fixed-length data packet; wherein the second type of fixed-length data packet is used for representing compressed and combined telemetry data; and sending the second type fixed-length data packet to the ground operation and control system so that the ground operation and control system decompresses the second type fixed-length data packet into the first type fixed-length data packet, and updating the compression reference table based on the first type fixed-length data packet.
Further, the first type of fixed-length data packet includes: a sync header, a sub-payload identification, a telemetry data type, and a telemetry data payload.
Further, the number of the sub-payloads is the same as the number of the first type fixed length packets; when the number of the sub-loads is multiple, the compressing and merging the first type fixed length data packet based on the compression reference table to obtain a second type fixed length data packet, including: compressing each first type fixed-length data packet respectively to obtain compressed telemetering data; and merging all the compressed telemetering data to obtain a second type fixed-length data packet.
Further, the second type of fixed-length data packet includes: the sync head, load controller identification, the telemetry data type, and compressed telemetry data.
Further, the compressing each first type fixed-length data packet respectively to obtain compressed telemetry data includes: determining a telemetry data payload within the first type of fixed length data packet and a category of the telemetry data payload; wherein the categories include at least one of: a navigation quantity class, a calculation quantity class and a state quantity class; determining slot information for each slot within a superframe based on the category of the telemetry data payload; wherein the time slots include a default data packet time slot and a plurality of non-default data packet time slots; determining forecast information of each non-default data packet time slot based on the time slot information of the default data packet time slot; and obtaining compressed telemetry data based on the forecast information of each non-default data packet time slot and the time slot information of each non-default data packet time slot.
Further, the obtaining compressed telemetry data based on the forecast information of each non-default data packet time slot and the time slot information of each non-default data packet time slot includes: carrying out difference on the forecast information of each non-default data packet time slot and the time slot information of each non-default data packet time slot to obtain a difference result; based on the difference result, compressed telemetry data is determined.
In a second aspect, the present invention provides a telemetry data processing apparatus for complex satellite loads, wherein the telemetry data processing apparatus is applied to a load controller, and includes: the first receiving unit is used for receiving the fixed-length data packet of the first type sent by at least one sub-load; wherein the first type of fixed-length data packet is used to represent telemetry data to be compressed; the second receiving unit is used for receiving the compression reference table uploaded by the ground operation control system; a compression merging unit, configured to perform compression merging on the first type fixed-length data packet based on the compression reference table, so as to obtain a second type fixed-length data packet; wherein the second type of fixed-length data packet is used for representing compressed and combined telemetry data; and the sending unit is used for sending the second type fixed-length data packet to the ground operation and control system so as to enable the ground operation and control system to decompress the second type fixed-length data packet into the first type fixed-length data packet, and updating the compression reference table based on the first type fixed-length data packet.
In a third aspect, the present invention provides a telemetry data processing system for complex satellite loads, including: a load controller applying the method according to any one of the first aspect, at least one sub-load connected to the load controller, a satellite where the load controller is located, a ground operation control system connected to the load controller, and a sub-load remote telemetry software platform connected to the ground operation control system.
In a fourth aspect, the present invention further provides an electronic device, including a memory and a processor, where the memory stores a computer program executable on the processor, and the processor executes the computer program to implement the steps of the telemetry data processing method for complex satellite payloads.
In a fifth aspect, the present invention further provides a computer readable medium having non-volatile program code executable by a processor, wherein the program code causes the processor to execute the method for processing telemetry data for a complex satellite payload.
The invention provides a telemetry data processing method, a device and a system for complex satellite loads, which are applied to a load controller and comprise the following steps: firstly, receiving a first type fixed-length data packet sent by at least one sub-load; wherein the first type of fixed-length data packet is used for representing telemetry data to be compressed; then receiving a compression reference table uploaded by the ground operation control system; then, the first type fixed-length data packet is compressed and merged based on the compression reference table to obtain a second type fixed-length data packet; wherein the second type fixed-length data packet is used for representing the compressed and combined telemetering data; and finally, sending the second type fixed-length data packet to the ground operation control system so that the ground operation control system decompresses the second type fixed-length data packet into the first type fixed-length data packet, and updating the compression reference table based on the first type fixed-length data packet. The compression reference table is updated in real time in the ground operation control system based on the first type of fixed-length data packet and then uploaded to the load controller, so that the load remote control method can adapt to the change of load remote control definition in different design stages.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of a complex satellite payload-oriented telemetry data processing system according to an embodiment of the present invention;
fig. 2 is a flowchart of a telemetry data processing method for a complex satellite load according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a first type of fixed-length data packet;
FIG. 4 is a flowchart of step S103 in FIG. 2;
FIG. 5 is a flowchart of step S201 in FIG. 4;
FIG. 6 is a diagram illustrating the structure of a superframe;
FIG. 7 is a flowchart of step S304 in FIG. 5;
FIG. 8 is a table of compression references for sub-load 1;
FIG. 9 is a schematic diagram of a first telemetry data processing procedure for sub-payload 1;
FIG. 10 is a schematic diagram of a second telemetry data processing procedure for sub-payload 1;
FIG. 11 is a table of compression references for sub-payload 2;
FIG. 12 is a schematic diagram of a first telemetry data processing procedure for sub-payload 2;
FIG. 13 is a schematic diagram of a second telemetry data processing procedure for sub-payload 2;
fig. 14 is a schematic structural diagram of a telemetry data processing apparatus for a complex satellite load according to an embodiment of the present invention.
Icon:
11-a first receiving unit; 12-a second receiving unit; 13-a compression merging unit; 14-transmitting unit.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The traditional telemetry data processing method uses a fixed compression mode and cannot adapt to the change of load telemetry definition in different design stages. Based on the above, the invention aims to provide a telemetry data processing method, device and system for complex satellite loads, which can adapt to the change of load telemetry definitions in different design stages through a compression reference table updated in real time.
For the convenience of understanding the embodiment, a detailed description will be given to a telemetry data processing system for a complex satellite load disclosed in the embodiment of the invention.
Example 1:
as shown in fig. 1, an embodiment of the present invention provides a telemetry data processing system for a complex satellite payload, including: the method comprises the steps of applying a load controller of any one of the following methods in embodiment 2, at least one sub-load (namely, a satellite load in figure 1, sub-load 2 and sub-load 3) connected with the load controller, a satellite (namely, the satellite in figure 1) where the load controller is located, a ground operation control system (namely, a ground operation control center in figure 1) connected with the load controller, and a sub-load remote control and telemetry software platform (namely, sub-load 1 remote control and telemetry software, sub-load 2 remote control and sub-load X remote control and telemetry software in figure 1) connected with the ground operation control system.
The connection relationship between the above devices can be obtained by fig. 1. The satellite and the ground operation control center can be in communication connection through a satellite-ground communication link (such as a remote control and telemetry link). The satellite-ground communication link can be a remote control and remote measurement link or a satellite-ground communication channel consisting of a feed link and an inter-satellite link of a satellite-ground user link. The satellite load, namely the complex satellite load, is composed of a plurality of sub-loads, the telemetry data content of the sub-loads cannot be defined and perfected at the beginning of satellite design in the design stage, and new telemetry content can be added at any time in the ground design and re-orbit software upgrading stages. The telemetry data processing system facing the complex satellite load can also be called a software defined satellite system. The above-mentioned satellite can refer to a software-defined satellite, and the software-defined satellite load has the capability of software on-orbit upgrade so as to adapt to the change of the requirement and the evolution-type improvement of the function. The compression reference table is updated in real time and uploaded to the load controller via the surface operation control center to adapt to changes in the load telemetry definition at different design stages, as described in detail with reference to example 2.
Example 2:
in accordance with an embodiment of the present invention, there is provided an embodiment of a telemetry data processing method for a complex satellite payload, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions and that, although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that presented herein.
Fig. 2 is a flowchart of a telemetry data processing method for a complex satellite payload according to an embodiment of the present invention, and as shown in fig. 2, the method includes the following steps:
step S101, receiving a first type fixed length data packet sent by at least one sub-load;
in the embodiment of the present invention, the first type of fixed-length data packet is used to represent telemetry data to be compressed, and for convenience of description, the first type of fixed-length data packet may be described as: type 1 fixed-length packets. The sub-payload sends the telemetry data to the payload controller in type 1 fixed length packets with a transmission period (i.e., the base telemetry period) of T1. The payload controller receives type 1 fixed length packets from a plurality of payloads within each base telemetry cycle T1.
As shown in fig. 3, the first type of fixed-length data packet includes: a sync header, a sub-payload identification, a telemetry data type, and a telemetry data payload.
The telemetry data type is distinguished from information such as a basic telemetry measurement type and an extended telemetry measurement. For example, when the length of the telemetry data payload of a certain sub-payload type 1 fixed-length data packet is 256 bytes, and the total required telemetry data exceeds 256 bytes, all the telemetry data can be divided into a plurality of types, for example, 256 bytes of important telemetry data are selected as basic telemetry data, and other telemetry data are selected as extended telemetry data and transmitted through a plurality of types of data packets. Essentially, the telemetry data type may also be considered a serial number of the telemetry data.
Step S102, receiving a compression reference table uploaded by a ground operation control system;
step S103, compressing and combining the first type fixed length data packet based on the compression reference table to obtain a second type fixed length data packet;
in an embodiment of the present invention, the second type of fixed-length data packet is used to represent compressed and combined telemetry data; the second type of fixed-length data packet comprises: a sync head, a load controller identification, a telemetry data type, and compressed telemetry data. For convenience of description, the second type of fixed-length packet may be described as: type 2 fixed-length packets. And carrying out type 1 fixed-length data packet compression and combination processing according to a compression reference table uploaded by the ground operation control system to form a type 2 fixed-length data packet. The load controller identifier and any one of the sub-load identifiers are not equal in value, and both the load controller identifier and the sub-load identifier need to be defined in advance, for example: the 4 sub-payload identifiers are respectively: 0, 1, 2, 3, and the load controller is labeled 5. In addition, in this embodiment, in addition to representing the two kinds of identifiers by numerical values, the identifiers may also be represented by letters or other symbols, and therefore, the specific format of the identifier is not specifically limited in this embodiment.
And step S104, sending the second type fixed-length data packet to the ground operation control system so that the ground operation control system decompresses the second type fixed-length data packet into the first type fixed-length data packet, and updating the compression reference table based on the first type fixed-length data packet.
In the embodiment of the present invention, compressing the reference table may include: (1) the code tables required for compression, such as: a Huffman code table or a run-length compression code table; (2) type 1 fixed length packets for each sub-payload the start bit, length and type (e.g., navigation metric, metering metric and state metric) of each data field of the telemetry data payload. The compression encoding method adopted by the embodiment of the invention can comprise various options, such as: huffman coding, run-length coding, etc.
The load controller sends the type 2 fixed-length data packet to a ground operation and control system through a satellite, the ground operation and control system receives the type 2 fixed-length data packet, the type 2 fixed-length data packet is recovered to be the type 1 fixed-length data packet after being processed, and the type 1 fixed-length data packet is sent to the remote control and remote measurement software of the sub-load to be displayed. It should be noted that the ground operation and control system may generate or update the compressed reference table according to the characteristics of the telemetry data payload of all type 1 data packets, and periodically upload the generated or updated compressed reference table to the load controller of the satellite.
The telemetry data processing method for complex satellite loads, provided by the embodiment of the invention, is applied to a load controller and comprises the following steps: firstly, receiving a first type fixed-length data packet sent by at least one sub-load; wherein the first type of fixed-length data packet is used for representing telemetry data to be compressed; then receiving a compression reference table uploaded by the ground operation control system; then, the first type fixed-length data packet is compressed and merged based on the compression reference table to obtain a second type fixed-length data packet; wherein the second type fixed-length data packet is used for representing the compressed and combined telemetering data; and finally, sending the second type fixed-length data packet to the ground operation control system so that the ground operation control system decompresses the second type fixed-length data packet into the first type fixed-length data packet, and updating the compression reference table based on the first type fixed-length data packet. The compression reference table in the embodiment of the invention is updated in real time in the ground operation control system based on the first type of fixed-length data packet and then is uploaded to the load controller, so that the change of the load telemetering definition in different design stages can be adapted.
In an alternative embodiment, the sub-payload is the same as the number of fixed length packets of the first type; when the number of the sub-payloads is multiple, as shown in fig. 4, step S103 is to compress and combine the first type fixed length data packet based on the compression reference table to obtain a second type fixed length data packet, and includes the following steps:
step S201, compressing each first type fixed-length data packet respectively to obtain compressed telemetering data;
and step S202, merging all the compressed telemetering data to obtain a second type fixed-length data packet.
In the embodiment of the present invention, compressing the first type of fixed-length data packet may refer to compressing only the telemetry data payload in the first type of fixed-length data packet. In addition, the method may also refer to compressing the sub-payload identifier, the telemetry data type and the telemetry data payload in the first type of fixed-length data packet, so that whether the telemetry data type of the sub-payload identifier is compressed is not specifically limited in this embodiment.
In an alternative embodiment, as shown in fig. 5, step S201, compressing each first type fixed-length data packet separately to obtain compressed telemetry data, includes the following steps:
step S301, determining the telemetering data payload in the first type fixed-length data packet and the type of the telemetering data payload;
in embodiments of the present invention, the concept of the category of the telemetry data payload is distinguished from the type of telemetry data, the category of the telemetry data payload is distinguished from the invariant features of each of the total telemetry data, and typically, the category of the telemetry data payload may be divided into: a navigation quantity class, a calculation quantity class and a state quantity class; the above navigation quantities include, but are not limited to: satellite position and satellite velocity output by the satellite-borne navigation receiver; such counts include, but are not limited to: counting the number of bytes of time and data on the satellite; the state quantity classes include, but are not limited to: temperature and voltage; all types of telemetry data payload are changed in each new type 1 fixed length data packet, and the change value is a fixed or regular quantity in the case of no exception, such as: the satellite time is increased by 1 per second; the above state quantities include: analog quantities and 0/1 state quantities. It should be noted that the type of telemetry data payload in the first type of fixed-length data packets of different sub-payloads may be different. For example: type 1 of sub-payload 1 the types of telemetry data payload within a fixed length data packet include: temperature and voltage, type 1 of sub-payload 1 type of telemetry data payload within a fixed length data packet includes: temperature, voltage, UTC Time (Coordinated Universal Time), satellite position, satellite velocity, etc.
Step S302, determining the time slot information of each time slot in the superframe based on the type of the telemetering data payload;
in the embodiment of the present invention, as shown in fig. 6, the superframe includes N slots, and the period is T2 — NT1 (i.e., T2 — N — T1). The time slots include a default data packet time slot and a plurality of non-default data packet time slots. The default packet slot may be referred to as slot 0 and the non-default packet slot may be referred to as slot i, where 0< i < N. Whether the time slot of the default data packet or the time slot of the non-default data packet is the default time slot, the time slot information of the default data packet or the non-default time slot needs to be issued to the ground operation and control center. The difference lies in that: the time slot information of the time slot 0 can be independently analyzed without depending on the time slot information of other time slots, the time slot information of the time slot i needs to be compressed depending on the time slot information of the time slot 0, and similarly, the time slot information of the time slot 0 also needs to be decompressed. The slot information may include: type 1 telemetry data payload in a fixed length prediction packet.
Step S303, determining the forecast information of each non-default data packet time slot based on the time slot information of the default data packet time slot;
and step S304, obtaining compressed telemetering data based on the forecast information of each non-default data packet time slot and the time slot information of each non-default data packet time slot.
In the embodiment of the present invention, the forecast information of the non-default data packet time slot may be referred to as a time slot i type 1 fixed length forecast data packet. For the current time slot i, forecasting (in a specific manner, see the following example) the type 1 fixed-length data packet of the time slot i according to the fixed-length data packet of each sub-load type 1 of the time slot 0, so as to obtain a fixed-length forecasting data packet of the time slot i type 1.
In an alternative embodiment, as shown in fig. 7, step S304, obtaining compressed telemetry data based on the forecast information of each non-default packet timeslot and the timeslot information of each non-default packet timeslot includes:
step S401, carrying out difference on the forecast information of each non-default data packet time slot and the time slot information of each non-default data packet time slot to obtain a difference result;
step S402, based on the difference result, determining the compressed telemetry data.
In the embodiment of the present invention, the prediction information may refer to a prediction data packet, and the difference result may refer to a type 1 fixed-length data packet after difference is made. Specifically, the telemetering data payload of the type 1 fixed-length data packet of each sub-load received in the time slot i is differenced with the telemetering data payload of the forecast data packet to obtain a differenced type 1 fixed-length data packet; then, the remote measuring data payload of the type 1 fixed-length data packet after difference is compressed and encoded according to a compression reference table to obtain compressed remote measuring data, and finally the compressed remote measuring data can be combined to form a second type fixed-length data packet.
Example 1:
assuming that there is a total of 4 payloads and one payload controller in a satellite payload, the sync header is 2 bytes in fig. 3, 0xABCD (0x represents a 16-ary representation); the sub-payload ID is 1 byte, and 4 sub-payloads correspond to 0, 1, 2, and 3, respectively; the ID of the payload controller is 4, the telemetry data type is 1 byte, 0x00 represents base telemetry, 0x01 represents extended telemetry, and the telemetry data payload is 256 bytes.
Assume that a 256-byte telemetry data payload with a sub-payload 1 telemetry data type of 0x00 is divided into:
(1) and (3) temperature remote measurement: 1 byte, from-128 degrees centigrade to 127 degrees centigrade;
(2) voltage remote measurement: 2 bytes with the unit of 0.1V;
(3) the remaining 253 bytes: undefined, and padding of 0x 55.
Assume that in the rail case, the current value of the temperature telemetry is 27 degrees celsius and the current value of the voltage is 5.0 volts. Most of the time, the temperature and voltage telemetry is substantially unchanged, i.e., the current T1 period is equal to the telemetry value of the last T1 period.
The compression reference table of the sub-load 1 uploaded by the ground operation control system is shown in fig. 8, and can be seen from fig. 8: the length, forecast increment, type and data compression coding mode of the telemetering data payload data field in the type 1 fixed-length data packet of the sub-load 1 are run-length coding. Specifically, the length of the data field 1 is 1 byte, the forecast increment is 0, and the type is temperature; the data field 2 is 2 bytes long, the prediction increment is 0, and the type is 5V voltage.
The run-length encoding used in fig. 8 is a relatively simple compression algorithm, and the basic idea is to use a character that repeatedly and continuously appears for a plurality of times (the number of continuous occurrences, a certain character) to describe, for example, a character string of 0 xaaabbbbccc, which is encoded to result in 5A4B 3C. 5A indicates 5 consecutive A's, similarly 4B indicates 4 consecutive B's, 3C indicates 3 consecutive C's, and so on. The original character string can be described by 12 characters, only 6 characters are needed to represent the original character string after the run-length coding compression is used, and the characters only need to be repeated for n times when the original character string is restored, so that the algorithm is very simple in principle. In this embodiment, since the total length of the telemetry data to be compressed is 256 bytes, if the end of the telemetry data to be compressed is all 0, there is no need for explicit representation, such as the representation after 0 xaaabbccc 000000000 is still 5A4B 3C.
A schematic diagram of a first telemetry data processing procedure for the sub-payload 1 when the telemetry data is unchanged is shown in fig. 9. Based on the time slot 0 sub-load 1 type 1 fixed-length data packet, determining a time slot 1 sub-load 1 type 1 fixed-length forecast data packet and a time slot 1 sub-load 1 type 1 fixed-length data packet, subtracting the two data packets to obtain a type 1 fixed-length data packet after the time slot 1 sub-load 1 is subtracted, and further obtaining compressed sub-load 1 telemetering data. And the compressed sub-load 1 telemetry data comprises a compressed sub-load identifier, a compressed data type identifier and a coded data length. A schematic diagram of a second telemetry data processing procedure for the sub-payload 1 when the telemetry data changes is shown in fig. 10. The processing procedure is similar to that of fig. 9, and is not described again.
Example 2:
assume that a 256-byte telemetry data payload with a sub-payload 2 telemetry data type of 0x00 is divided into:
(1) and (3) temperature remote measurement: 1 byte, from-128 degrees centigrade to 127 degrees centigrade;
(2) voltage remote measurement: 2 bytes with the unit of 0.1V;
(3) satellite UTC time: 4 bytes in seconds, normally incremented by 1 every T1 cycle.
(4) Satellite real-time position: 12 bytes, geocentric geodesic coordinate system, 4 bytes each of three axes x, y and z, unit: rice;
(5) satellite real-time speed: 12 bytes, geocentric geodesic coordinate system, 4 bytes each of three axes x, y and z, unit: centimeter per second;
(6) the remaining 225 bytes: undefined, and padding of 0x 55.
The compression reference table of the sub-load 2 uploaded by the ground operation control system is shown in fig. 11, and 5 data fields; wherein, the length of the data field 1 is 1 byte, the preset increment is 0, and the type is temperature; the length of the data field 2 is 2 bytes, the preset increment is 0, and the type is 5V voltage; the length of the data field 3 is 4 bytes, the preset increment is 1, and the type is satellite UTC time; the length of the data field 4 is 4 bytes, the preset increment is the increment calculated according to the second-order gravity field, and the type is the real-time position of the satellite; the length of the data field 5 is 4 bytes, the preset increment is the increment calculated according to the second-order gravity field, and the type is the real-time speed of the satellite.
In fig. 11, the increment is calculated according to a second-order gravity field, namely the satellite real-time position increment is calculated based on a J2 dynamic model, and the forecast error is usually less than 1 meter within 1 second. The calculation of satellite real-time position increment based on J2 dynamic model is a published method in the prior literature. The increments are calculated in terms of a second order gravitational field, typically with a velocity error forecast of less than 1 cm/sec within 1 second.
A schematic diagram of a first telemetry data processing procedure for sub-payload 2 when the telemetry data is unchanged is shown in fig. 12. Sub-payload 2 telemetry data processing is similar to that of fig. 9, but sub-payload 2 corresponds to time slot 2, and in fig. 12 and 13, data beginning with 0x is represented as 16-ary data and data not beginning with 0x is represented as 10-ary data. In fig. 12, X, Y, and Z are used to represent the satellite positions at the time of UTC time 12345680, X ', Y', and Z 'are used to represent the satellite positions at the time of UTC time 12345680, which are forecasted, and it is assumed in fig. 12 that the satellite position telemetry at the time of UTC time 12345680 given by the sub-load 2 received in time slot 2 is also exactly X', Y ', and Z'. Similarly, Vx ', Vy', Vz 'represents the predicted satellite velocity at the time of UTC time 12345680, while in fig. 12 it is assumed that the satellite velocity telemetry at the time of UTC time 12345680 given by the sub-load 2 received at time slot 2 is also exactly Vx', Vy ', Vz'.
Of course, the predicted satellite position, satellite velocity, and actual satellite position and satellite velocity given by the sub-load 2 may be different, in fig. 13, X ", Y", and Z "represent satellite position remote measurement at the time of UTC time 12345680 given by the sub-load 2, and assuming that the X-axis position prediction error is X" -X ' ═ 5 meters, the Y-axis position prediction error is Y "-Y ' ═ 3 meters, and the Z-axis prediction error is Z" -Z ' ═ 1 meters, and the velocity prediction is accurate, a data compression process as shown in fig. 13 may occur.
It should be noted that there are many data compression methods, and this embodiment is only described in the run-length encoding example, so this embodiment does not restrict the specific data compression method.
In the two examples, the type 1 fixed-length data of all the sub-payloads are compressed and packed into 1 type 2 fixed-length data packet from the time slot 1 to the time slot N-1. It should be noted that if the compressed data cannot be put into the same type 2 fixed-length data packet, the data can be packed into 2 or more type 2 fixed-length data packets.
The compressed reference table in this embodiment can be uploaded as needed, and thus can adapt to changes in load telemetry definitions at different design stages. In addition, the type 2 fixed-length data packets from the time slot 1 to the time slot N are compressed, so that the transmission of the type 2 fixed-length data packets can effectively reduce the satellite-ground communication bandwidth required by the load telemetry.
Example 3:
the embodiment of the invention provides a complex satellite load-oriented telemetering data processing device, which is mainly used for executing the complex satellite load-oriented telemetering data processing method provided by the embodiment 2, and the complex satellite load-oriented telemetering data processing device provided by the embodiment of the invention is specifically described below.
Fig. 14 is a schematic structural diagram of a telemetry data processing apparatus for a complex satellite load according to an embodiment of the present invention. As shown in fig. 14, the apparatus for forming diffracted wave based on azimuth-dip gathers mainly comprises: a first receiving unit 11, a second receiving unit 12, a compression combining unit 13 and a transmitting unit 14, wherein:
a first receiving unit 11, configured to receive a fixed-length data packet of a first type sent by at least one sub-payload; wherein the first type of fixed-length data packet is used for representing telemetry data to be compressed;
the second receiving unit 12 is configured to receive a compression reference table uploaded by the ground operation control system;
a compression merging unit 13, configured to perform compression merging on the first type fixed-length data packet based on the compression reference table to obtain a second type fixed-length data packet; wherein the second type fixed-length data packet is used for representing the compressed and combined telemetering data;
and the sending unit 14 is configured to send the second type fixed-length data packet to the ground operation and control system, so that the ground operation and control system decompresses the second type fixed-length data packet into the first type fixed-length data packet, and updates the compression reference table based on the first type fixed-length data packet.
The telemetry data processing device for complex satellite loads, provided by the embodiment of the invention, is applied to a load controller and comprises: firstly, a first receiving unit is utilized to receive a first type fixed-length data packet sent by at least one sub-load; wherein the first type of fixed-length data packet is used for representing telemetry data to be compressed; then, a second receiving unit is used for receiving a compression reference table uploaded by the ground operation control system; then, a compression merging unit is used for compressing and merging the first type fixed length data packet based on the compression reference table to obtain a second type fixed length data packet; wherein the second type fixed-length data packet is used for representing the compressed and combined telemetering data; and finally, sending the second type fixed-length data packet to the ground operation control system so that the ground operation control system decompresses the second type fixed-length data packet into the first type fixed-length data packet, and updating the compression reference table based on the first type fixed-length data packet. The compression reference table in the embodiment of the invention is updated in real time in the ground operation control system based on the first type of fixed-length data packet and then is uploaded to the load controller, so that the change of the load telemetering definition in different design stages can be adapted.
Optionally, the first type of fixed-length data packet includes: a sync header, a sub-payload identification, a telemetry data type, and a telemetry data payload.
Optionally, the number of the sub-payloads is the same as the number of the first type fixed length packets; when the number of the sub-payloads is plural, the compression combining unit 13 includes: a compression subunit and a merging subunit, wherein:
the compression subunit is used for respectively compressing each first type fixed-length data packet to obtain compressed telemetering data;
and the merging subunit is used for merging all the compressed telemetering data to obtain a second type fixed-length data packet.
Optionally, the second type of fixed-length data packet includes: a sync head, a load controller identification, a telemetry data type, and compressed telemetry data.
Optionally, the compression subunit includes a first determination module, a second determination module, a third determination module, and a fourth determination module, wherein:
a first determining module, configured to determine a telemetry data payload in the first type of fixed-length data packet, and a category of the telemetry data payload; wherein the categories include at least one of: a navigation quantity class, a calculation quantity class and a state quantity class;
a second determining module for determining slot information for each slot in the superframe based on the category of the telemetry data payload; wherein the time slots include a default data packet time slot and a plurality of non-default data packet time slots;
the third determining module is used for determining the forecast information of each non-default data packet time slot based on the time slot information of the default data packet time slot;
and the fourth determining module is used for obtaining compressed telemetering data based on the forecast information of each non-default data packet time slot and the time slot information of each non-default data packet time slot.
Optionally, the fourth determining module includes: a difference making submodule and a determination submodule, wherein:
the difference module is used for carrying out difference on the forecast information of each non-default data packet time slot and the time slot information of each non-default data packet time slot to obtain a difference result;
and the determining submodule is used for determining the compressed telemetry data based on the difference result.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In an optional embodiment, the present embodiment further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program operable on the processor, and the processor executes the computer program to implement the steps of the method of the foregoing method embodiment.
In an alternative embodiment, the present embodiment also provides a computer readable medium having non-volatile program code executable by a processor, wherein the program code causes the processor to perform the method of the above method embodiment.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the term "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present embodiment, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and operate, and thus should not be construed as limiting the present embodiment. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the embodiments provided in the present embodiment, it should be understood that the disclosed method and apparatus may be implemented in other manners. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present embodiment or parts of the technical solution may be essentially implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (10)
1. A telemetry data processing method for complex satellite loads is applied to a load controller and comprises the following steps:
receiving a first type fixed-length data packet sent by at least one sub-load; wherein the first type of fixed-length data packet is used to represent telemetry data to be compressed;
receiving a compression reference table uploaded by a ground operation control system;
compressing and merging the first type fixed-length data packet based on the compression reference table to obtain a second type fixed-length data packet; wherein the second type of fixed-length data packet is used for representing compressed and combined telemetry data;
and sending the second type fixed-length data packet to the ground operation and control system so that the ground operation and control system decompresses the second type fixed-length data packet into the first type fixed-length data packet, and updating the compression reference table based on the first type fixed-length data packet.
2. The method of claim 1, wherein the first type of fixed-length data packet comprises: a sync header, a sub-payload identification, a telemetry data type, and a telemetry data payload.
3. The method of claim 2, wherein the sub-payloads are the same number as the first type of fixed length packets; when the number of the sub-loads is multiple, the compressing and merging the first type fixed length data packet based on the compression reference table to obtain a second type fixed length data packet, including:
compressing each first type fixed-length data packet respectively to obtain compressed telemetering data;
and merging all the compressed telemetering data to obtain a second type fixed-length data packet.
4. The method of claim 3, wherein the second type of fixed-length data packet comprises: the sync head, load controller identification, the telemetry data type, and compressed telemetry data.
5. The method of claim 4, wherein the compressing each of the first type of fixed-length data packets separately to obtain compressed telemetry data comprises:
determining a telemetry data payload within the first type of fixed length data packet and a category of the telemetry data payload; wherein the categories include at least one of: a navigation quantity class, a calculation quantity class and a state quantity class;
determining slot information for each slot within a superframe based on the category of the telemetry data payload; wherein the time slots include a default data packet time slot and a plurality of non-default data packet time slots;
determining forecast information of each non-default data packet time slot based on the time slot information of the default data packet time slot;
and obtaining compressed telemetry data based on the forecast information of each non-default data packet time slot and the time slot information of each non-default data packet time slot.
6. The method of claim 5, wherein obtaining compressed telemetry data based on the forecast information for each of the non-default packet slots and the slot information for each of the non-default packet slots comprises:
carrying out difference on the forecast information of each non-default data packet time slot and the time slot information of each non-default data packet time slot to obtain a difference result;
based on the difference result, compressed telemetry data is determined.
7. The telemetry data processing device for complex satellite loads is applied to a load controller and comprises the following components:
the first receiving unit is used for receiving the fixed-length data packet of the first type sent by at least one sub-load; wherein the first type of fixed-length data packet is used to represent telemetry data to be compressed;
the second receiving unit is used for receiving the compression reference table uploaded by the ground operation control system;
a compression merging unit, configured to perform compression merging on the first type fixed-length data packet based on the compression reference table, so as to obtain a second type fixed-length data packet; wherein the second type of fixed-length data packet is used for representing compressed and combined telemetry data;
and the sending unit is used for sending the second type fixed-length data packet to the ground operation and control system so as to enable the ground operation and control system to decompress the second type fixed-length data packet into the first type fixed-length data packet, and updating the compression reference table based on the first type fixed-length data packet.
8. A telemetry data processing system for complex satellite payload comprising: load controller applying the method according to any of claims 1-6, at least one sub-load connected to the load controller, a satellite where the load controller is located, a ground operation control system connected to the load controller, and a sub-load remote telemetry software platform connected to the ground operation control system.
9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 6 when executing the computer program.
10. A computer-readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the method of any of claims 1 to 6.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013029646A1 (en) * | 2011-08-26 | 2013-03-07 | European Space Agency | Method, device and system for compressing time series data |
| CN106330291A (en) * | 2016-08-12 | 2017-01-11 | 上海卫星工程研究所 | Data receiving and transmitting system and method for remote support of satellite tests |
| EP3329612A1 (en) * | 2015-07-31 | 2018-06-06 | ViaSat, Inc. | Flexible capacity satellite constellation |
| CN108966283A (en) * | 2018-06-25 | 2018-12-07 | 北京微纳星空科技有限公司 | A kind of telemetry compression transmitting method, device and computer-readable medium |
-
2020
- 2020-09-10 CN CN202010950761.9A patent/CN112087456B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013029646A1 (en) * | 2011-08-26 | 2013-03-07 | European Space Agency | Method, device and system for compressing time series data |
| EP3329612A1 (en) * | 2015-07-31 | 2018-06-06 | ViaSat, Inc. | Flexible capacity satellite constellation |
| CN106330291A (en) * | 2016-08-12 | 2017-01-11 | 上海卫星工程研究所 | Data receiving and transmitting system and method for remote support of satellite tests |
| CN108966283A (en) * | 2018-06-25 | 2018-12-07 | 北京微纳星空科技有限公司 | A kind of telemetry compression transmitting method, device and computer-readable medium |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114827920A (en) * | 2021-01-11 | 2022-07-29 | 大唐移动通信设备有限公司 | Communication method, device, equipment and readable storage medium |
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