CN103413094A - Telemetering encryption system applicable to spacecraft CPU (central processing unit) - Google Patents
Telemetering encryption system applicable to spacecraft CPU (central processing unit) Download PDFInfo
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Abstract
A telemetering encryption system applicable to a spacecraft CPU comprises an interface processing module, a telemetering information processing module and a telemetering encryption module, wherein the interface processing module is used for exchanging internal signals and external signals, adjusting bi-directional parallel data signals according to a parallel address and a read-write control signal which are from an external CPU and finishing data writing and data reading; the telemetering encryption module performs data format analysis according to input synchronizing signals to generate enciphered data, performs framing and parallel-serial conversion on the enciphered data, and outputs the enciphered data to the telemetering information processing module; the telemetering information processing module generates telemetering interrupt signals at regular time according to the state of a timer; the input parallel data are spliced and adjusted into a data format which is acceptable to other modules; plaintext parallel data required to be output is subjected to parallel-serial conversion; and plaintext data or encrypted data are output according to the set plaintext and encrypted signals of telemetering data, and the output serial telemetering data are encoded and output to the exterior.
Description
Technical field
The present invention relates to a kind of encryption system, particularly a kind of system in spaceborne data handling subsystem host computer, telemetry is encrypted that is applicable under spacecraft environment.
Background technology
Spacecraft is in-orbit in flight course, and land station can be by the CTU(CPU (central processing unit)) telemetry function obtain working status parameter and the environmental data of inner each system of spacecraft, for the performance of evaluation spacecraft with carry out fault analysis foundation is provided.In addition, in the telemetry of spacecraft, also may comprise various military sensitive informations, or relate to the private information of user ' s right, in case reveal, will cause serious consequence.
Secure service (Confidentiality Service) is one makes any unauthorized parties all can not explain the business from the information content in the source of mandate.Secure service usage data cryptographic algorithm is transformed to encrypt data by clear data, leaks to prevent data content.
The telemetry that CTU is gathered is encrypted, and by cryptographic means, guarantees that telemetry do not learned by unauthorized parties exactly.In the spacecraft design, the remote measurement secure service is often used independently encryption device to realize.Current remote measurement encryption device is because hardware resource is limited, and outside data-interface can only adopt serial line interface, causes data transmission efficiency lower.Existing remote measurement encryption device independence is stronger, and structure is fixed, less with the information that external unit is mutual, causes the encryption device obtained information less, is unfavorable for grasping the duty of encryption device; Interactive information is restricted, thereby causes expanding the new business difficulty.In addition, the independent encryption device of sampling can take resource on more star, increases equipment volume.If realize the remote measurement encryption function in number pipe host computer, can greatly reduce the data volume of transmitting between devices in system so, improve data transmission efficiency, strengthen the compatibility of equipment, be convenient to expand multiple business, improve system performance.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of system in spaceborne data handling subsystem host computer, telemetry is encrypted under spacecraft environment that is applicable to is provided.
Technical solution of the present invention is: a kind of remote measurement encryption system that is applicable to spacecraft CTU, comprise interface processing module, telemetry intelligence (TELINT) processing module, remote measurement encrypting module, wherein:
The interface processing module: further comprise bi-directional data adjustment unit, cpu data reading unit and cpu data writing unit, wherein:
The bi-directional data adjustment unit: remote measurement enable signal, the CPU that receives the outer CPU input reads enable signal, CPU writes enable signal, parallel address and writes parallel data, receive the parallel data of reading of cpu data reading unit, the described parallel data that writes comprises telemetry and the bright close state of remote measurement, read parallel data and comprise parallel bright close state, parallel bright close status data is bright state or close state data for what identify the output of telemetry intelligence (TELINT) processing module; When the remote measurement enable signal effectively and CPU read enable signal when effective, from the parallel data of reading that the cpu data reading unit will be corresponding with parallel address, deliver to outer CPU, when the remote measurement enable signal effectively and CPU write enable signal when effective, address and write parallel data and deliver to the cpu data writing unit will walk abreast;
The cpu data reading unit: when the remote measurement enable signal effectively and CPU read enable signal when effective, according to parallel address, obtain and read parallel data from the telemetry intelligence (TELINT) processing module;
The cpu data writing unit: when the remote measurement enable signal effectively and CPU write enable signal when effective, will walk abreast address and write the parallel data buffer memory after deliver to the telemetry intelligence (TELINT) processing module;
The telemetry intelligence (TELINT) processing module: further comprise remote measurement interrupt generating unit, data concatenation unit, parallel serial conversion unit, bright unit and the telemetry code unit of closely changing, wherein:
Remote measurement interrupt generating unit: utilize counter, timing output remote measurement look-at-me is to outer CPU, makes outer CPU after receiving the remote measurement look-at-me, will write parallel data and delivers to the interface processing module and will write parallel data via the interface processing module and deliver to the data concatenation unit;
The data concatenation unit: what will receive writes a high position and the low level that parallel data is put into respectively buffer, the spliced parallel data that writes is delivered to parallel serial conversion unit and remote measurement encrypting module simultaneously after having read splicing by the data in buffer are disposable subsequently;
Parallel serial conversion unit: the parallel data that writes that the data concatenation unit is transmitted is converted to bright state serial data, and bright state serial data is carried out after the sequential adjustment makes the bright state serial data maintenance sequential identical with close state serial data delivering to the bright unit that closely changes; Described close state serial data is obtained the parallel data that writes received by the remote measurement encrypting module after encryption and parallel-serial conversion;
The bright unit that closely changes: receive simultaneously bright state serial data and close state serial data, from the interface processing module, obtain the bright close status signal of remote measurement simultaneously, according to the bright close state selectivity of the bright close status signal sign of remote measurement, bright state serial data or close state serial data are delivered to the telemetry code unit; According to being input to the bright bright close signal of telemetering state that closely changes unit, parallel bright close status data is set, bright close status data sends to the interface processing module walking abreast after setting completed;
Telemetry code unit: by the backward outside output of encoding of bright state serial data or close state serial data;
Remote measurement encrypting module: writing after parallel data is encrypted and is converted to close state serial data of transmitting of telemetry intelligence (TELINT) processing module delivered to the telemetry intelligence (TELINT) processing module.
The present invention's advantage compared with prior art is:
1, remote measurement encryption system of the present invention adopts parallel interface transmission data, is different from traditional serial line interface, under same frequency, can improve the efficiency of data transmission.
2, the data transmission efficiency of remote measurement encryption system of the present invention improves, and the advantage of bringing is can the time-sharing multiplex interface, when guaranteeing remote measurement encryption function information interaction, can extend more business.For example, when needed, can expand the business that remote information is processed; The time-sharing multiplex interface, be convenient to on-board equipment and send control information to the remote measurement encryption system, as bright close status information, also can obtain more facility information, as the Real-Time Monitoring of bright close state, by strengthening monitoring and the control to encryption system, be convenient to realize the autonomous operation of on-board equipment.
3, remote measurement encryption system of the present invention can adopt FPGA to realize, has avoided independent development remote measurement encryption device, in the situation that guarantee remote measurement encryption function performance, has reduced the manpower of development equipment, the input of financial resources, has reduced the volume of equipment.The data-interface, address interface and the control signal interface that adopt are the device interior interface, do not need to take limited external interface resource, have avoided the waste of hardware resource.
4, remote measurement encryption system of the present invention can strengthen the applicability of equipment by the data communication agreement of self-defined remote measurement encryption system and CPU, can extend more business in-orbit, is convenient to the expansion of follow-up business.
The accompanying drawing explanation
Fig. 1 is the logic diagram of system of the present invention;
Fig. 2 is the logic diagram of the interface processing module of system of the present invention;
Fig. 3 is the logic diagram of the telemetry intelligence (TELINT) processing module of system of the present invention;
Fig. 4 is the telemetry code front and back waveform schematic diagram of system of the present invention;
Fig. 5 is the logic diagram of the remote measurement encrypting module of system of the present invention.
Embodiment
As shown in Figure 1, for the theory of constitution block diagram of remote measurement encryption system of the present invention, mainly comprise interface processing module, telemetry intelligence (TELINT) processing module, remote measurement encrypting module, three modules all realize in FPGA, use FPGA in the host computer of spaceborne data handling subsystem, to realize the remote measurement cryptographic operation, wherein:
The major function of interface processing module is to adjust exchange inner, external signal, and the signal of processing comprises parallel address, parallel data and the read-write control signal from outer CPU, and wherein parallel data is two-way signaling.According to parallel address, the read-write control signal from outer CPU, adjust the two-way simultaneous data-signal, complete writing and reading of data, reach the purpose with the outer CPU information interaction.
As shown in Figure 2, the interface processing module comprises 3 parts: the bi-directional data adjustment unit, cpu data reading unit and cpu data writing unit, the bi-directional data adjustment unit mainly completes from reading out data on BDB Bi-directional Data Bus and to the operation of bus data writing, according to CPU, read the action type that enable signal and CPU write enable signal judgement data, carry out the conversion of bi-directional data, the cpu data reading unit completes the transmission of parallel bright close status data, for CPU, read, 2 groups of parallel expressly telemetries and the bright close state of telemetry that the cpu data writing unit writes CPU are sent into the telemetry intelligence (TELINT) processing module.
The interface processing module is carried out the information interaction between CPU and FPGA, need to carry out three grades of judgements, and the judgement content comprises that remote measurement enable signal, CPU read enable signal, CPU writes enable signal and parallel address.First order judgement is undertaken by cpu data reading unit and cpu data writing unit, by judge whether the to take remote measurement operation of signal of judgement remote measurement enable signal, if the remote measurement enable signal is effective, and the operation of the signal that takes remote measurement; Otherwise, keep current state.Second level judgement is undertaken by cpu data reading unit and cpu data writing unit equally, needs information type to be processed according to the judgement of parallel address, and information type comprises the bright close state of remote measurement, telemetry.According to information type, the cpu data reading unit can latch the corresponding informance of telemetry intelligence (TELINT) processing module, reads for CPU; The cpu data writing unit carries out buffer memory by the data that CPU writes, and the data after buffer memory are sent to the telemetry intelligence (TELINT) processing module.Third level judgement is completed by the bi-directional data adjustment unit, bi-directional data adjustment unit judgement CPU reads enable signal and CPU writes enable signal, if it is effective that CPU reads enable signal, the data of cpu data reading unit output are delivered to parallel data port and read for CPU; If it is effective that CPU writes enable signal, from parallel data port, read the data of CPU, deliver to the cpu data writing unit; If there is no effective enable signal, keep current state.
Wherein, in the judgement of the second level, information type is to determine according to the communication protocol of FPGA and CPU.The state of the communication protocol agreement read-write control signal between CPU and FPGA, parallel address and bi-directional data signal, realize the transmission of multiple business information.Physical interface comprises: 16 bit parallel address interfaces, 16 bit parallel data-interfaces, remote measurement enable signal, CPU reads enable signal and CPU writes enable signal.The communication protocol of FPGA and CPU has been stipulated the physical interface state that the full detail type is relevant, according to the physical interface state, carry out three grades of judgements and just can know exactly the information type that needs operation and the operation that need to carry out, for example can be according to shown in table 1, arranging communication protocol.The interface of FPGA and CPU can arrange as table 2 sample.
Table 1 communication protocol example
Table 2FPGA and cpu i/f list
As shown in Figure 3, the telemetry intelligence (TELINT) processing module by remote measurement interrupt generating unit, data concatenation unit, parallel serial conversion unit, brightly closely change unit and the telemetry code unit forms, be respectively used to the generation of remote measurement look-at-me, data splicing, parallel-serial conversion, brightly closely changed, the telemetry code function.
The remote measurement interrupt generating unit arranges a counter, timing output remote measurement look-at-me.Outer CPU is delivered to the interface processing module by parallel telemetry after receiving the remote measurement look-at-me, the interface processing module is carried out three grades of judgements according to the communication protocol of FPGA and CPU, after determining and being the telemetry that writes of CPU, the parallel telemetry write is delivered to respectively to the data concatenation unit of telemetry intelligence (TELINT) processing module.In CPU reads, have no progeny, also need to remove interrupt operation.When CPU removes and interrupt to process, according to communication protocol, corresponding read-write control signal and parallel address are set, FPGA removes interrupt operation after receiving clearly look-at-me.For example counter widths is set to 5, uses the clock signal of serial telemetry to count, and every 32 clock period propose a look-at-me, after CPU receives look-at-me, send continuously the telemetry that 2 groups of width are 16bits.
After the data concatenation unit receives parallel telemetry, data are put into respectively to a high position and the low level of buffer, subsequently spliced parallel telemetry is delivered to parallel serial conversion unit and remote measurement encrypting module simultaneously.The remote measurement encrypting module will walk abreast after telemetry encrypts, and be converted to the close state data of serial and export the bright unit that closely changes to.The parallel serial conversion unit telemetry that will walk abreast is converted to serial data, and carries out the sequential adjustment, and bright state serial data is kept and the identical sequential of close state serial data.The bright unit that closely changes receives bright state serial telemetry and close state serial telemetry simultaneously, and select the bright state data of output or export close state data according to the bright close signal of the telemetry of setting, serial data after conversion is copied to the output identical serial remote measurement in 2 tunnels; Width is set is the bright close status data of 16 bit parallel according to being input to the bright bright close signal of telemetering state that closely changes unit, if the bright close signal of remote measurement is bright state, it is 0x0000 that parallel bright close status data is set so, if the bright close signal of remote measurement is close state, it is 0x0007 that parallel bright close status data is set, and bright close status data sends to the interface processing module walking abreast after setting completed.
Parallel serial conversion unit arranges the parallel data latch signal that width is 1 clock period, when the parallel data latch signal is effective, parallel data is latched; When the parallel data latch signal is invalid, each clock period data that will latch by low level to high bit shift 1 time.When latch data is stable, the most significant digit of output parallel data.Parallel serial conversion unit need to carry out the sequential adjustment, after valid data latch, with respect to valid data, latchs the clock periodicity of time delay according to the close state remote measurement of serial, and counter is set, and the bright state remote measurement of serial is postponed to the same clock period.If equipment occurs abnormal, causing latch data is not valid data, the remote measurement encrypting module can't be encrypted computing to data, so just do not exist the close state remote measurement of serial with respect to valid data, to latch the clock periodicity of time delay, in this case, the parallel serial conversion unit data that directly will latch carry out exporting to the telemetry code unit after parallel-serial conversion.
The telemetry code unit is by the bright NRZ-L(non-return-to-zero level code that closely changes unit output) pattern serial remote measurement is converted to NRZ-S(non-return-to-zero spacing code) code, and be divided into 2 tunnels and export.The coding rule of NRZ-S code is, if the current data level is 0, a level saltus step occurs; If the current data level is 1, without level, change.Waveform before and after the telemetry code cell encoding as shown in Figure 4.It is 0 that NRZ-S code initial value is set, and latchs the serial remote measurement of 1 NRZ-L pattern, when latch data is 0, to the output data-conversion; When latch data is 1, keep current state constant.
The remote measurement encrypting module is encrypted for the parallel telemetry received, and the telemetry after encrypting sends to the telemetry intelligence (TELINT) processing module.As shown in Figure 5, the remote measurement encrypting module comprises cipher key management unit, cryptographic algorithm unit, framing unit and parallel serial conversion unit.Specific cryptographic algorithm is realized in the cryptographic algorithm unit, and its input is bright state data and key data, and output is close state data and status information.Cipher key management unit reads primary key data in advance and delivers to the cryptographic algorithm unit according to outer synchronous signal.The status information form according to a preconcerted arrangement of the bright state data that the framing unit will be inputted, close state data and generation is exported after framing again.The parallel serial conversion unit principle of parallel serial conversion unit and telemetry intelligence (TELINT) processing module is identical, and difference is to have removed the link of output invalid data and the link that the bright state remote measurement of serial time delay is carried out to the sequential adjustment, and other implementation method is identical.
The content be not described in detail in instructions of the present invention belongs to those skilled in the art's known technology.
Claims (1)
1. remote measurement encryption system that is applicable to spacecraft CTU is characterized in that: comprise interface processing module, telemetry intelligence (TELINT) processing module, remote measurement encrypting module, wherein:
The interface processing module: further comprise bi-directional data adjustment unit, cpu data reading unit and cpu data writing unit, wherein:
The bi-directional data adjustment unit: remote measurement enable signal, the CPU that receives the outer CPU input reads enable signal, CPU writes enable signal, parallel address and writes parallel data, receive the parallel data of reading of cpu data reading unit, the described parallel data that writes comprises telemetry and the bright close state of remote measurement, read parallel data and comprise parallel bright close state, parallel bright close status data is bright state or close state data for what identify the output of telemetry intelligence (TELINT) processing module; When the remote measurement enable signal effectively and CPU read enable signal when effective, from the parallel data of reading that the cpu data reading unit will be corresponding with parallel address, deliver to outer CPU, when the remote measurement enable signal effectively and CPU write enable signal when effective, address and write parallel data and deliver to the cpu data writing unit will walk abreast;
The cpu data reading unit: when the remote measurement enable signal effectively and CPU read enable signal when effective, according to parallel address, obtain and read parallel data from the telemetry intelligence (TELINT) processing module;
The cpu data writing unit: when the remote measurement enable signal effectively and CPU write enable signal when effective, will walk abreast address and write the parallel data buffer memory after deliver to the telemetry intelligence (TELINT) processing module;
The telemetry intelligence (TELINT) processing module: further comprise remote measurement interrupt generating unit, data concatenation unit, parallel serial conversion unit, bright unit and the telemetry code unit of closely changing, wherein:
Remote measurement interrupt generating unit: utilize counter, timing output remote measurement look-at-me is to outer CPU, makes outer CPU after receiving the remote measurement look-at-me, will write parallel data and delivers to the interface processing module and will write parallel data via the interface processing module and deliver to the data concatenation unit;
The data concatenation unit: what will receive writes a high position and the low level that parallel data is put into respectively buffer, the spliced parallel data that writes is delivered to parallel serial conversion unit and remote measurement encrypting module simultaneously after having read splicing by the data in buffer are disposable subsequently;
Parallel serial conversion unit: the parallel data that writes that the data concatenation unit is transmitted is converted to bright state serial data, and bright state serial data is carried out after the sequential adjustment makes the bright state serial data maintenance sequential identical with close state serial data delivering to the bright unit that closely changes; Described close state serial data is obtained the parallel data that writes received by the remote measurement encrypting module after encryption and parallel-serial conversion;
The bright unit that closely changes: receive simultaneously bright state serial data and close state serial data, from the interface processing module, obtain the bright close status signal of remote measurement simultaneously, according to the bright close state selectivity of the bright close status signal sign of remote measurement, bright state serial data or close state serial data are delivered to the telemetry code unit; According to being input to the bright bright close signal of telemetering state that closely changes unit, parallel bright close status data is set, bright close status data sends to the interface processing module walking abreast after setting completed;
Telemetry code unit: by the backward outside output of encoding of bright state serial data or close state serial data;
Remote measurement encrypting module: writing after parallel data is encrypted and is converted to close state serial data of transmitting of telemetry intelligence (TELINT) processing module delivered to the telemetry intelligence (TELINT) processing module.
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| CN105760335B (en) * | 2016-02-19 | 2018-08-31 | 北京空间飞行器总体设计部 | A kind of spacecraft general-purpose interface controller |
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| CN106788674A (en) * | 2016-12-02 | 2017-05-31 | 航天东方红卫星有限公司 | A kind of data broadcasting Dispatching Unit for moonlet |
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| CN108540446A (en) * | 2017-03-06 | 2018-09-14 | 波音公司 | Utilize the virtual transponder with interior order |
| CN108540446B (en) * | 2017-03-06 | 2022-04-05 | 波音公司 | Virtual transponder with in-band commands |
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| CN109634190A (en) * | 2019-01-21 | 2019-04-16 | 上海微小卫星工程中心 | Satellite processing terminal and satellite processing terminal design method |
| CN112181741A (en) * | 2020-09-18 | 2021-01-05 | 青岛鼎信通讯股份有限公司 | Station terminal remote measuring method based on ARM platform Linux system |
| CN113364514A (en) * | 2021-05-31 | 2021-09-07 | 上海航天计算机技术研究所 | High-speed baseband data processing device applied to satellite platform |
| CN113364514B (en) * | 2021-05-31 | 2022-08-26 | 上海航天计算机技术研究所 | High-speed baseband data processing device applied to satellite platform |
| CN114488090A (en) * | 2022-01-28 | 2022-05-13 | 上海灵昉科技有限公司 | Single-point direct measurement flight time device and laser ranging system |
| CN115549769A (en) * | 2022-10-17 | 2022-12-30 | 中国电子科技集团公司第五十四研究所 | Satellite communication system bright and dense state switching method based on automatic control |
| CN115549769B (en) * | 2022-10-17 | 2023-07-18 | 中国电子科技集团公司第五十四研究所 | Satellite communication system open-close state switching method based on automatic control |
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