CN103413094B - A kind of remote measurement encryption system being applicable to spacecraft CTU - Google Patents
A kind of remote measurement encryption system being applicable to spacecraft CTU Download PDFInfo
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Abstract
Be applicable to a remote measurement encryption system of spacecraft CTU, comprise interface processing module, telemetry intelligence (TELINT) processing module, remote measurement encrypting module.Interface processing module is used for carrying out inside and outside portion signal exchange, and according to from the parallel address of outer CPU, read-write control signal, adjustment two-way simultaneous data-signal, completes data writing and reading.Remote measurement encrypting module, according to the synchronizing signal of input, carries out data layout parsing, generates enciphered data, exports telemetry intelligence (TELINT) processing module after carrying out framing and parallel-serial conversion to enciphered data.Telemetry intelligence (TELINT) processing module is according to the state of timer, and timing produces remote measurement look-at-me; The parallel data of input is spliced, data point reuse is become other module acceptable data layout; Parallel-serial conversion is carried out to needing the bright state parallel data exported; The bright close signal behavior of telemetry according to setting exports bright state data or exports close state data, and externally exports after encoding to the serial telemetry exported.
Description
Technical field
The present invention relates to a kind of encryption system, particularly a kind of system being applicable in spaceborne data handling subsystem host computer, telemetry to be encrypted under spacecraft environment.
Background technology
Spacecraft is in-orbit in flight course, and land station can pass through CTU(CPU (central processing unit)) telemetry function obtain working status parameter and the environmental data of the inner each system of spacecraft, for evaluating the performance of spacecraft and carrying out fault analysis and provide foundation.In addition, also may comprise various military sensitive information in the telemetry of spacecraft, or relate to the private information of user ' s right, once reveal, will serious consequence be caused.
Secure service (ConfidentialityService) is a business making any unauthorized parties all can not explain the information content from the source of mandate.Clear data is transformed to encrypt data by secure service usage data cryptographic algorithm, leaks to prevent data content.
The telemetry that CTU gathers is encrypted, guarantees that telemetry is not learned by unauthorized parties by cryptographic means exactly.In Spacecraft guidance and control, remote measurement secure service often uses independently encryption device to realize.Current remote measurement encryption device due to hardware resource limited, and the data-interface of outside can only adopt serial line interface, causes data transmission efficiency lower.Existing remote measurement encryption device independence is comparatively strong, and structure is fixed, and the information mutual with external unit is less, causes the encryption device information of acquisition less, is unfavorable for the duty grasping encryption device; Interactive information is restricted, thus causes expanding new business difficulty.In addition, independent encryption device of sampling can take resource on more star, increases equipment volume.If realize remote measurement encryption function in several pipe host computer, so can greatly reduce the data volume transmitted between devices in system, 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, provides a kind of system being applicable to be encrypted telemetry in spaceborne data handling subsystem host computer under spacecraft environment.
Technical solution of the present invention is: a kind of remote measurement encryption system being applicable to spacecraft CTU, comprises interface processing module, telemetry intelligence (TELINT) processing module, remote measurement encrypting module, wherein:
Interface processing module: comprise bi-directional data adjustment unit, cpu data reading unit and cpu data writing unit further, wherein:
Bi-directional data adjustment unit: the remote measurement enable signal of reception outer CPU input, CPU read enable signal, CPU write enable signal, parallel address and write parallel data, receive the reading parallel data of cpu data reading unit, described write parallel data 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 remote measurement enable signal effectively and CPU read enable signal effective time, from cpu data reading unit, the reading parallel data corresponding with parallel address is delivered to outer CPU, when remote measurement enable signal is effective and CPU write enable signal is effective, cpu data writing unit is delivered in parallel address and write parallel data;
Cpu data reading unit: when remote measurement enable signal effectively and CPU read enable signal effective time, to obtain from telemetry intelligence (TELINT) processing module according to parallel address and read parallel data;
Cpu data writing unit: when remote measurement enable signal is effective and CPU write enable signal is effective, delivers to telemetry intelligence (TELINT) processing module by behind parallel address and write parallel data buffer memory;
Telemetry intelligence (TELINT) processing module: comprise remote measurement interrupt generating unit, data concatenation unit, parallel serial conversion unit, bright close switch unit and telemetry code unit further, wherein:
Remote measurement interrupt generating unit: utilize counter, timing output remote measurement look-at-me, to outer CPU, makes outer CPU after receiving remote measurement look-at-me, write parallel data be delivered to interface processing module and via interface processing module, write parallel data be delivered to data concatenation unit;
Data concatenation unit a: high position and the low level of the write parallel data received being put into respectively buffer, delivers to parallel serial conversion unit and remote measurement encrypting module by spliced write parallel data after subsequently disposable for the data in buffer reading being completed splicing simultaneously;
Parallel serial conversion unit: the write parallel data transmitted by data concatenation unit is converted to bright state serial data, carries out delivering to bright close switch unit after sequential adjustment makes the bright state serial data maintenance sequential identical with close state serial data to bright state serial data; Described close state serial data is obtained the write parallel data received by remote measurement encrypting module after encryption and parallel-serial conversion;
Bright close switch unit: simultaneously receive bright state serial data and close state serial data, simultaneously obtain the bright close status signal of remote measurement from interface processing module, according to the bright close condition selecting of the bright close status signal mark of remote measurement, bright state serial data or close state serial data are delivered to telemetry code unit; To walk abreast bright close status data according to the bright close signal setting of the telemetering state being input to bright close switch unit, after setting completed parallel bright close status data is being sent to interface processing module;
Telemetry code unit: externally export after bright state serial data or close state serial data are encoded;
Remote measurement encrypting module: write parallel data telemetry intelligence (TELINT) processing module transmitted is encrypted and delivers to telemetry intelligence (TELINT) processing module after being converted to close state serial data.
The present invention's advantage is compared with prior art:
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 brought is can time-sharing multiplex interface, while guaranteeing remote measurement encryption function information interaction, can extend more business.Such as, when needed, the business of remote information process can be expanded; Time-sharing multiplex interface, is convenient to on-board equipment and sends control information to remote measurement encryption system, as bright close status information, also more facility information can be obtained, as the Real-Time Monitoring of bright close state, by strengthening the monitor and forecast to encryption system, be convenient to the autonomous operation realizing on-board equipment.
3, remote measurement encryption system of the present invention can adopt FPGA to realize, and avoids development remote measurement encryption device separately, when ensureing remote measurement encryption function performance, decreasing the manpower of development equipment, the input of financial resources, reducing the volume of equipment.The data-interface adopted, address interface and control signal interface are device interior interface, do not need to take limited external interface resource, avoid the waste of hardware resource.
4, remote measurement encryption system of the present invention by the data communication protocol of self-defined remote measurement encryption system and CPU, can strengthen the applicability of equipment, can extend more business in-orbit, be convenient to the expansion of follow-up business.
Accompanying drawing explanation
Fig. 1 is the logic diagram of present system;
Fig. 2 is the logic diagram of the interface processing module of present system;
Fig. 3 is the logic diagram of the telemetry intelligence (TELINT) processing module of present system;
Fig. 4 be present system telemetry code before and after waveform schematic diagram;
Fig. 5 is the logic diagram of the remote measurement encrypting module of present system.
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, realize remote measurement cryptographic operation, wherein:
The major function of interface processing module is that adjustment is inner, the exchange of external signal, and the signal of process comprises from the parallel address of outer CPU, parallel data and read-write control signal, and wherein parallel data is two-way signaling.According to from the parallel address of outer CPU, read-write control signal, adjustment two-way simultaneous data-signal, completes the writing and reading of data, reaches the object with outer CPU information interaction.
As shown in Figure 2, interface processing module comprises 3 parts: bi-directional data adjustment unit, cpu data reading unit and cpu data writing unit, bi-directional data adjustment unit mainly completes and reads data and the operation to bus write data from BDB Bi-directional Data Bus, the action type that enable signal and CPU write enable signal judge data is read according to CPU, carry out the conversion of bi-directional data, cpu data reading unit completes the transmission of parallel bright close status data, read for CPU, 2 groups of parallel expressly telemetries that CPU writes by cpu data writing unit and the bright close state of telemetry send into telemetry intelligence (TELINT) processing module.
Interface processing module carries out the information interaction between CPU and FPGA, needs to carry out three grades of judgements, judges that content comprises remote measurement enable signal, CPU reads enable signal, CPU write enable signal and parallel address.The first order judges to be undertaken by cpu data reading unit and cpu data writing unit, by the operation of the signal that judges remote measurement enable signal to judge whether to need to take remote measurement, if remote measurement enable signal is effective, then and the operation of the signal that takes remote measurement; Otherwise, keep current state.The second level judges to be undertaken by cpu data reading unit and cpu data writing unit equally, and judge to need information type to be processed according to parallel address, information type comprises the bright close state of remote measurement, telemetry.According to information type, cpu data reading unit can latch the corresponding informance of telemetry intelligence (TELINT) processing module, reads for CPU; The data that CPU writes by cpu data writing unit carry out buffer memory, and the data after buffer memory are sent to telemetry intelligence (TELINT) processing module.The third level judges then to be completed by bi-directional data adjustment unit, bi-directional data adjustment unit judges that CPU reads enable signal and CPU write enable signal, if it is effective that CPU reads enable signal, then the data that cpu data reading unit exports are delivered to parallel data port and read for CPU; If CPU write enable signal is effective, then reads the data of CPU from parallel data port, deliver to cpu data writing unit; If there is no effective enable signal, then keep current state.
Wherein, in the judgement of the second level, information type determines according to the communication protocol of FPGA and CPU.The state of the communication protocol agreement read-write control signal between CPU and FPGA, walk abreast address and bi-direction data signal, realizes the transmission of multiple business information.Physical interface comprises: 16 bit parallel address interfaces, 16 bit parallel data interfaces, remote measurement enable signal, CPU read enable signal and CPU write enable signal.The communication protocol of FPGA with CPU defines the relevant physical interface state of full detail type, carry out three grades according to physical interface state to judge just to know the needs information types operated and the operation needing to carry out exactly, such as, can arrange communication protocol according to shown in table 1.The interface of FPGA and CPU can be arranged as table 2 sample.
Table 1 communication protocol example
Table 2FPGA and cpu i/f list
As shown in Figure 3, telemetry intelligence (TELINT) processing module is made up of remote measurement interrupt generating unit, data concatenation unit, parallel serial conversion unit, bright close switch unit and telemetry code unit, has been respectively used to the generation of remote measurement look-at-me, data splicing, parallel-serial conversion, has brightly closely changed, telemetry code function.
Remote measurement interrupt generating unit arranges a counter, timing output remote measurement look-at-me.After outer CPU receives remote measurement look-at-me, parallel telemetry is delivered to interface processing module, interface processing module carries out three grades of judgements according to the communication protocol of FPGA and CPU, determine be CPU write telemetry after, the parallel telemetry data of write are delivered to respectively the data concatenation unit of telemetry intelligence (TELINT) processing module.Have no progeny in CPU reads, also need to carry out removing interrupt operation.When CPU carries out removing interrupt processing, arrange corresponding read-write control signal and parallel address according to communication protocol, FPGA receives clearly after look-at-me, carries out removing interrupt operation.Such as counter widths is set to 5, and use the clock signal of serial telemetry to count, every 32 clock period propose a look-at-me, and after CPU receives look-at-me, sending 2 groups of width is continuously the telemetry of 16bits.
After data concatenation unit receives parallel telemetry data, data are put into respectively a high position and the low level of buffer, subsequently spliced parallel telemetry data are delivered to parallel serial conversion unit and remote measurement encrypting module simultaneously.Remote measurement encrypting module, by after parallel telemetry data encryption, is converted to serial close state data and exports bright close switch unit to.Parallel telemetry data are converted to serial data by parallel serial conversion unit, and carry out sequential adjustment, make the sequential that bright state serial data keeps identical with close state serial data.Bright close switch unit receives bright state serial telemetry and close state serial telemetry simultaneously, and export bright state data according to the bright close signal behavior of telemetry of setting or export close state data, serial data after conversion is copied, exports the serial remote measurement that 2 tunnels are identical; Be the bright close status data of 16 bit parallel according to the bright close signal setting width of the telemetering state being input to bright close switch unit, if remote measurement bright secret letter number is bright state, so arranging parallel bright close status data is 0x0000, if remote measurement bright secret letter number is close state, arranging parallel bright close status data is 0x0007, after setting completed parallel bright close status data is being sent to interface processing module.
Parallel serial conversion unit arranges the parallel data latch signal that width is 1 clock period, when parallel data latch signal is effective, parallel data is latched; When parallel data latch signal is invalid, each clock period by the data that latch by low level to high bit shift 1 time.When latch data is stable, export the most significant digit of parallel data.Parallel serial conversion unit needs to carry out sequential adjustment, after valid data latch, latches the clock periodicity of time delay, arrange counter, bright for serial state remote measurement is postponed the same clock period according to the close state remote measurement of serial relative to valid data.If equipment occurs abnormal, latch data is caused not to be valid data, remote measurement encrypting module cannot be encrypted computing to data, so just there is not time delay is latched in the close state remote measurement of serial clock periodicity relative to valid data, in this case, parallel serial conversion unit exports to telemetry code unit after directly the data of latch being carried out parallel-serial conversion.
The NRZ-L(non-return-to-zero level code that bright close switch unit exports by telemetry code unit) 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 current data level is 0, then a level saltus step occurs; If current data level is 1, then change without level.Waveform before and after telemetry code cell encoding as shown in Figure 4.Arranging NRZ-S code initial value is 0, latches the serial remote measurement of 1 NRZ-L pattern, when latch data is 0, to output data-conversion; When latch data is 1, keep current state constant.
Remote measurement encrypting module is encrypted for the parallel telemetry data received, and the telemetry after encryption is sent to telemetry intelligence (TELINT) processing module.As shown in Figure 5, remote measurement encrypting module comprises cipher key management unit, cryptographic algorithm unit, Framing unit and parallel serial conversion unit.Cryptographic algorithm unit realizes specific cryptographic algorithm, 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 according to outer synchronous signal and delivers to cryptographic algorithm unit.Framing unit exports after the status information of the bright state data of input, close state data and generation form according to a preconcerted arrangement again framing.Parallel serial conversion unit is identical with the parallel serial conversion unit principle of telemetry intelligence (TELINT) processing module, and difference eliminates the link exporting invalid data and the link of bright for serial state remote measurement time delay being carried out sequential adjustment, and other implementation method is identical.
The content be not described in detail in instructions of the present invention belongs to the known technology of those skilled in the art.
Claims (1)
1. be applicable to a remote measurement encryption system for spacecraft CPU (central processing unit), it is characterized in that: comprise interface processing module, telemetry intelligence (TELINT) processing module, remote measurement encrypting module, wherein:
Interface processing module: comprise bi-directional data adjustment unit, cpu data reading unit and cpu data writing unit further, wherein:
Bi-directional data adjustment unit: the remote measurement enable signal of reception outer CPU input, CPU read enable signal, CPU write enable signal, parallel address and write parallel data, receive the reading parallel data of cpu data reading unit, described write parallel data 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 remote measurement enable signal effectively and CPU read enable signal effective time, from cpu data reading unit, the reading parallel data corresponding with parallel address is delivered to outer CPU, when remote measurement enable signal is effective and CPU write enable signal is effective, cpu data writing unit is delivered in parallel address and write parallel data;
Cpu data reading unit: when remote measurement enable signal effectively and CPU read enable signal effective time, to obtain from telemetry intelligence (TELINT) processing module according to parallel address and read parallel data;
Cpu data writing unit: when remote measurement enable signal is effective and CPU write enable signal is effective, delivers to telemetry intelligence (TELINT) processing module by behind parallel address and write parallel data buffer memory;
Telemetry intelligence (TELINT) processing module: comprise remote measurement interrupt generating unit, data concatenation unit, parallel serial conversion unit, bright close switch unit and telemetry code unit further, wherein:
Remote measurement interrupt generating unit: utilize counter, timing output remote measurement look-at-me, to outer CPU, makes outer CPU after receiving remote measurement look-at-me, write parallel data be delivered to interface processing module and via interface processing module, write parallel data be delivered to data concatenation unit;
Data concatenation unit a: high position and the low level of the write parallel data received being put into respectively buffer, delivers to parallel serial conversion unit and remote measurement encrypting module by spliced write parallel data after subsequently disposable for the data in buffer reading being completed splicing simultaneously;
Parallel serial conversion unit: the write parallel data transmitted by data concatenation unit is converted to bright state serial data, carries out delivering to bright close switch unit after sequential adjustment makes the bright state serial data maintenance sequential identical with close state serial data to bright state serial data; Described close state serial data is obtained the write parallel data received by remote measurement encrypting module after encryption and parallel-serial conversion;
Bright close switch unit: simultaneously receive bright state serial data and close state serial data, simultaneously obtain the bright close status signal of remote measurement from interface processing module, according to the bright close condition selecting of the bright close status signal mark of remote measurement, bright state serial data or close state serial data are delivered to telemetry code unit; To walk abreast bright close status data according to the bright close signal setting of the telemetering state being input to bright close switch unit, after setting completed parallel bright close status data is being sent to interface processing module;
Telemetry code unit: externally export after bright state serial data or close state serial data are encoded;
Remote measurement encrypting module: write parallel data telemetry intelligence (TELINT) processing module transmitted is encrypted and delivers to telemetry intelligence (TELINT) processing module after being converted to close state serial data.
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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 |
| CN106788674B (en) * | 2016-12-02 | 2019-07-12 | 航天东方红卫星有限公司 | A kind of data broadcasting Dispatching Unit for moonlet |
| US10530751B2 (en) | 2017-03-06 | 2020-01-07 | The Boeing Company | Virtual transponder utilizing inband telemetry |
| US10419403B2 (en) * | 2017-03-06 | 2019-09-17 | The Boeing Company | Virtual transponder utilizing inband commanding |
| US11394458B2 (en) | 2017-03-06 | 2022-07-19 | The Boeing Company | Inband telemetry for a virtual transponder |
| CN109086610B (en) * | 2018-06-19 | 2020-07-10 | 上海卫星工程研究所 | Processing method for consistency of hot standby states of two encryption and decryption machines on satellite |
| CN109634190B (en) * | 2019-01-21 | 2020-09-15 | 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 |
| 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 |
| 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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