CN109067451B - Multifunctional measurement and control and data distribution terminal for improving real-time performance of data transmission - Google Patents
Multifunctional measurement and control and data distribution terminal for improving real-time performance of data transmission Download PDFInfo
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- CN109067451B CN109067451B CN201810631114.4A CN201810631114A CN109067451B CN 109067451 B CN109067451 B CN 109067451B CN 201810631114 A CN201810631114 A CN 201810631114A CN 109067451 B CN109067451 B CN 109067451B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18517—Transmission equipment in earth stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/26—Special purpose or proprietary protocols or architectures
Abstract
The invention discloses a multifunctional measurement and control and data distribution terminal for improving the real-time performance of data transmission, which is characterized by comprising the following components: the remote control command module receives a remote control signal of a ground measurement and control station or a relay satellite, completes carrier demodulation, despreading, descrambling and decryption processing, and sends a processed remote control information code to an on-board computer; the telemetering signal transmitting module and the data distribution module are fused together to form a fusion module. The invention breakthroughs the fusion of satellite remote measurement data and broadcast distribution data for users in the data layer, greatly reduces the weight, layout and power consumption requirements of the whole satellite compared with the traditional independent scheme of a satellite-borne measurement and control single machine and a data distribution terminal, and improves the universality, reliability and flexibility.
Description
Technical Field
The invention relates to the field of satellite systems, in particular to a multifunctional measurement and control and data distribution terminal for improving the real-time performance of data transmission.
Background
When the satellite operates in space, the satellite needs to receive a remote control command of a ground or relay satellite and send a telemetering signal to the ground or relay satellite, and meanwhile, key data also needs to be distributed to ground users. Currently, telemetry data and broadcast distribution data to users are typically sent separately, which adds significantly to the size and weight of the satellite and does not provide high real-time communication.
Disclosure of Invention
Aiming at the development requirements of intensification and microminiaturization of satellite functions in China at present, a unified and universal software and hardware system architecture of the satellite-borne measurement and control and data distribution multifunctional terminal is designed and formed through the research of a satellite-borne measurement and control and data distribution multifunctional comprehensive special technology, so that the software and hardware system architecture has the characteristics of light weight and small size, unified hardware platform and reconfigurable functional software, and finally the satellite-borne foundation measurement and control, relay measurement and control, broadcast distribution and other multifunctional integrated long-life and high-reliability multifunctional measurement and control and data distribution terminal is realized.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a multifunctional measurement and control and data distribution terminal for improving the real-time performance of data transmission comprises a remote control instruction receiving module (TC) and a fusion module formed by fusing a telemetry signal Transmitting Module (TM) and a data distribution module (DATE); and the remote control instruction module (TC) receives a remote control signal of a ground measurement and control station or a relay satellite, completes carrier demodulation, despreading, descrambling and decryption processing, and transmits a processed remote control information code to the satellite-borne computer.
Further, the fusion module dynamically forms the telemetry frame by the ground distribution data packet and the telemetry data packet together in real time.
Further, the fusion module encrypts, scrambles, modulates, frequency divides (different carrier frequencies) and power amplifies the fused telemetry frame, and sends the frame to a ground measurement and control station, a ground user or a relay satellite.
Further, the remote control command and the telemetry data adopt an S-band incoherent spread spectrum communication system.
In a first step, telemetry frames and telemetry packets are constructed to conform to the CCSDS protocol.
In summary, compared with the prior art, the invention fuses the telemetry data and the ground distribution data at the data level. On the module integration, the size and the weight of the system are greatly reduced, and on the communication timeliness, the real-time performance of distributing data to the ground can be greatly improved due to the fact that the telemetering signals are downloaded in real time.
Drawings
Fig. 1 is a schematic diagram of a communication structure of a multifunctional measurement and control and data distribution terminal for improving real-time data transmission according to the present invention.
Fig. 2 shows the channel access data unit and virtual channel data unit formats of the present invention.
FIG. 3 is a diagram of a leading header format in a virtual channel data unit format according to the present invention.
Fig. 4 is a Virtual Channel (VC) label of the present invention.
FIG. 5 illustrates a telemetry data packet and a distribution data packet in an embodiment of the present invention.
Detailed Description
The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a multifunctional measurement and control and data distribution terminal communication structure for improving real-time performance of data transmission, including: the remote control system comprises a remote control instruction receiving module (TC), a telemetry signal Transmitting Module (TM) and a data distribution module (DATE), wherein the telemetry signal Transmitting Module (TM) and the data distribution module (DATE) are fused together to form a fusion module. Specifically, a remote control instruction module (TC) receives a remote control signal of a ground measurement and control station or a relay satellite, completes carrier demodulation, despreading, descrambling and decryption processing, and sends a processed remote control information code to an on-board computer. The fusion module dynamically forms a telemetering frame by the ground distribution data packet and the telemetering data packet in real time, encrypts, scrambles, modulates, frequency divides (different carrier frequencies) and amplifies power of the telemetering frame, and sends the telemetering frame to a ground measurement and control station, a ground user or a relay satellite. The remote control command and the telemetering data adopt an S-band incoherent spread spectrum communication system, and a telemetering frame and a telemetering packet are formed to follow a CCSDS protocol.
The principles of the present invention for fusion of telemetry signals and ground distribution data are described below in conjunction with fig. 2, 3, 4 and 5, respectively.
As shown in fig. 2, the channel access data unit is composed of a frame sync word of fixed 4 bytes and a virtual channel access unit composed of a frame header, an insertion field (length to be determined), a frame data field, and an error control field.
The following description is made with respect to a virtual channel access unit format:
(1) fig. 3 shows the frame format in the frame header, which follows the CCSDS protocol, specifically as follows:
a) version number: 2bits, bits 0-1;
b) satellite code number: 10bits, bits 2-9;
c) virtual Channel (VC) flag: 6 bits, bits 10-15, and at most 62 Virtual Channels (VC) with a value of "1-62", wherein 01H is a telemetry real-time frame, 02H is a telemetry delay frame, 05H is a distribution data frame, 06H is a hybrid data frame (including both a telemetry data packet and a distribution data packet), and 3FH is a padding frame, as shown in fig. 4;
d) the virtual channel data unit counter, bits 16-39, provides a separate technique for each virtual channel, representing the sequential count (modulo 16) of VCDU transmissions on each VC.
e) Signal domain: 8bits, bits 40-47, the signal field has two subfields: a playback flag (bit 40) and a spare field (bit 41-bit 47), respectively, the playback flag bit "0" indicating real-time VCDU data and "1" indicating playback VCDU data. The spare field is undefined and can be reserved, set to "all 0".
f) And (3) leading error control: and the check symbol is used for carrying out error detection and correction on the version number field, the VCDU identifier field and the signal field. The generation of the VCDU preamble error control field uses a shortened R-S (10,6) code.
(2) Insertion field: the inserted domain is used for representing parameters of a physical channel of the satellite platform, and is not encrypted, scrambled or channel multiplexed, so that the observation station can conveniently capture and track.
(3) Frame data field: put in telemetry packets and distribute packets.
(4) Frame error control field: and performing CRC check on the 'main header, the insertion field and the data field'.
For the telemetry and distribution packets shown in fig. 5, the data format is as follows:
a) version number: 3bits, bits 0-2, fixed at 000, representing the source packet format;
b) the type indicates: 1bit, bits 3-0, representing a telemetry data packet, and 1, representing a distribution data packet;
c) auxiliary guide head mark: 1bit, bit 4, having a sub-leader of 1, using the first 2 bytes of the data to represent the sub-leader, having no sub-leader of 0;
d) application Process Identifier (APID): 11bits, bits 5-15, for identifying each RT terminal on the spacecraft, "all 1" indicates "padding packet";
e) packet flags (2 bits): 00-middle package, 01-first package, 10-last package, 11-independent package;
f) the packet sequence count, bit 18 through bit 31, is a sequence counter that counts each packet generated by an application tagged with a unique application identifier. This binary count should be done continuously, modulo 16384, idle packets do not require counting;
g) packet data length: packet data field length-1;
h) telemetry application data: an even number of bytes.
In summary, by using the telemetry packet and the telemetry frame conforming to the CCSDS protocol, data fusion of telemetry data and distribution data on the telemetry packet and telemetry frame level can be realized, and flexible dynamic real-time framing can be performed. Compared with the prior art, the invention can simultaneously send the ground distribution data and the remote measuring signals for the user, greatly improves the real-time property of data transmission, can reduce the volume and the weight of the system, and has the advantages of simple structure, easy realization and low cost.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (3)
1. The utility model provides an improve multi-functional observing and controling of data transmission real-time nature and data distribution terminal which characterized in that includes: the remote control command module receives a remote control signal of a ground measurement and control station or a relay satellite, completes carrier demodulation, despreading, descrambling and decryption processing, and sends a processed remote control information code to an on-board computer; the telemetering signal transmitting module and the data distribution module are fused together to form a fusion module;
the fusion module dynamically forms a telemetry frame by the ground distribution data packet and the telemetry data packet in real time;
the telemetry frame and the telemetry data packet are formed to conform to a CCSDS protocol;
the channel access data unit in the fusion of the telemetering signal and the ground distribution data consists of a frame synchronization word and a virtual channel access unit, wherein the frame synchronization word is fixed by 4 bytes, and the virtual channel access unit consists of a frame main guide head, an insertion domain, a frame data domain and an error control domain;
the frame format in the frame header follows the CCSDS protocol, and specifically follows:
a) version number: 2bits, bits 0-1;
b) satellite code number: 10bits, bits 2-9;
c) virtual Channel (VC) flag: 6 bits, 10-15 bits, and at most 62 Virtual Channels (VC) which have the value of 1-62, wherein 01H is a telemetering real-time frame, 02H is a telemetering delay frame, 05H is a distribution data frame, 06H is a mixed data frame, the mixed data frame simultaneously comprises a telemetering data packet and a distribution data packet, and 3FH is a filling frame;
d) a virtual channel data unit counter, bits 24-39, providing a separate technique for each virtual channel, representing the sequential count of VCDUs transmitted on each VC, modulo 16;
e) signal domain: 8bits, bits 40-47, the signal field has two subfields: a playback flag and a spare field, respectively, wherein the playback flag is bit 40, the spare field is bit 41-bit 47, a playback flag bit "0" represents real-time VCDU data, and a playback flag bit "1" represents a playback VCDU; the spare field is undefined and is set to be 'all 0';
f) and (3) leading error control: the method comprises the steps of checking a version number field, a VCDU identifier field and a signal field for error detection and correction; the generation of the VCDU preamble error control field uses a shortened R-S (10,6) code.
2. The multifunctional measurement and control and data distribution terminal for improving the real-time performance of data transmission according to claim 1, wherein the fusion module encrypts, scrambles, modulates, frequency divides and power amplifies the fused telemetry frame, and sends the frame to a ground measurement and control station, a ground user or a relay satellite.
3. The multifunctional measurement and control and data distribution terminal for improving the real-time performance of data transmission according to claim 1, wherein the remote control command and the telemetry data adopt an S-band incoherent spread spectrum communication system.
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| CN110095745A (en) * | 2019-04-28 | 2019-08-06 | 中国科学院国家天文台 | A kind of processing method of lunar orbiter low frequency radio frequency spectrograph real time data |
| CN110429967A (en) * | 2019-07-08 | 2019-11-08 | 上海航天电子有限公司 | Packet telecommand telemetering system channel critical point |
| CN111147128A (en) * | 2019-12-04 | 2020-05-12 | 上海卫星工程研究所 | Satellite service data real-time downloading system suitable for global scope |
| CN111953400B (en) * | 2020-07-23 | 2022-06-03 | 上海卫星工程研究所 | Task-driven low-orbit satellite broadcast distribution device, method, system and medium |
| CN112054836B (en) * | 2020-07-30 | 2022-08-12 | 北京空间飞行器总体设计部 | Remote control information processing system and method for remote sensing satellite based on bus channel backup |
| CN113098586B (en) * | 2021-03-30 | 2022-04-29 | 中国电子信息产业集团有限公司第六研究所 | Satellite measurement and control safety communication method |
| CN113489561B (en) * | 2021-05-31 | 2022-08-12 | 上海卫星工程研究所 | Time maintenance and processing method and system under deep space exploration variable bit rate |
| CN113644956B (en) * | 2021-07-13 | 2022-07-29 | 中国电子科技集团公司电子科学研究院 | Satellite-based information relay data distribution method oriented to satellite internet |
| CN114513247B (en) * | 2022-04-18 | 2022-07-22 | 北京开运联合信息技术集团股份有限公司 | Method for distributing multi-satellite control data information |
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