CN108399141B - Data-driven space-based communication system enabling method - Google Patents
Data-driven space-based communication system enabling method Download PDFInfo
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- CN108399141B CN108399141B CN201810125973.6A CN201810125973A CN108399141B CN 108399141 B CN108399141 B CN 108399141B CN 201810125973 A CN201810125973 A CN 201810125973A CN 108399141 B CN108399141 B CN 108399141B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004891 communication Methods 0.000 title claims abstract description 22
- 238000001914 filtration Methods 0.000 claims description 11
- 238000005311 autocorrelation function Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000010363 phase shift Effects 0.000 claims description 3
- 238000005316 response function Methods 0.000 claims description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4004—Coupling between buses
- G06F13/4022—Coupling between buses using switching circuits, e.g. switching matrix, connection or expansion network
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
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- H03H17/0254—Matched filters
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Abstract
The invention relates to a data-driven space-based communication system enabling method, which is implemented together by software and hardware and is characterized in that the hardware comprises a processor integrated with a bus chip, and the software comprises a data receiving module, a data shunt multiplexing module, a data utilization strategy module and an enabling signal generating module; the data in the data receiving module is divided into data streams with the same number according to the number of the required enabling signals, each data stream enters the data in the processor to be judged by the strategy module, and then enters the enabling signal generating module to generate corresponding enabling signals, and the enabling signals comprise internal instructions left in the processor and external instructions output from the processor. The method of the invention reduces the complexity of the interface circuit, thereby reducing the complexity of system hardware, and simultaneously improving the expansibility of system functions through software configuration.
Description
Technical Field
The invention relates to a data-driven space-based communication system enabling method, and belongs to the field of aerospace measurement and control communication.
Background
With the development of satellite communication technology and microelectronic technology, the application of space-based measurement and control communication in aerospace type flight tests is more and more common. Meanwhile, the functional integration level of the aircraft at the space-based terminal is higher and higher. Traditional space flight measurement and control communication system adopts contact signal to carry out the ability to the function more to in order to improve the reliability, often adopt the redundant design, when terminal integrated function is more, often can cause terminal outside pencil too much, terminal internal relay and opto-coupler more, the system hardware complexity increases, the probability increase of going wrong in the production test process.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a data-driven space-based communication system enabling method, which carries out system enabling control by identifying characteristic points or instruction words in an input data stream to replace contact signals, and can greatly reduce the system complexity and increase the system expandability.
(II) technical scheme
A data-driven space-based communication system enabling method is implemented jointly through software and hardware, wherein the hardware comprises a processor integrated with a bus chip, and the software comprises a data receiving module, a data shunt multiplexing module, a data utilization strategy module and an enabling signal generating module; the data in the data receiving module is divided into data streams with the same number according to the number of the required enabling signals, each data stream enters the data in the processor to be judged by the strategy module, and then enters the enabling signal generating module to generate corresponding enabling signals, and the enabling signals comprise internal instructions left in the processor and external instructions output from the processor.
The processor is FPGA or FPGA + DSP.
When the space-based communication system needs to add a new enabling function, hardware does not need to be added, and only software or hardware updating is needed, and an instruction or a feature code is added into the data stream.
The data utilization strategy module is internally provided with a digital matching filtering type data stream, N paths of data streams output from the data shunt multiplexing module are respectively input into the data utilization strategy module, the N paths of data streams respectively carry out corresponding matching filtering in the data utilization strategy module so as to carry out corresponding judgment, and finally the N paths of data streams respectively enter the enabling signal generation module to generate corresponding enabling signals; wherein N is a natural number greater than or equal to 1.
The method comprises the following steps:
step 1: selecting and storing a template and a threshold;
step 2: setting a digital matched filter;
and step 3: data shunting;
and 4, step 4: filtering and judging;
and 5: an enable signal is output.
Wherein, the step 1 specifically comprises the following steps: and selecting and storing a characteristic sequence or an instruction sequence meeting the requirements in advance as a template, and setting a proper judgment threshold value.
Wherein, the step 2 specifically comprises the following steps:
the digital matched filter takes the local characteristic sequence as a tap coefficient of the filter;
the working process is as follows: when the phase of the receiving sequence is aligned with that of the local sequence, a correlation peak value is output, the correlation peak value is an autocorrelation function value when the sequence has zero phase shift, and the subsequent decision is to detect the correlation peak value;
suppose that a sequence of length L is selected as the signature sequence, akFor the k sequence value, the local n characteristic sequence is
Where (n-k) is the (n-k) th impulse response sequence, the output of the matched filter is the autocorrelation function of the input sequence, and the corresponding impulse response function of the matched filter is
Wherein k, n and L are integers more than or equal to 0;
when the sequence is long, a partial matched filter or a parallel matched filter is adopted to ensure the real-time performance and reduce the resource occupation as much as possible.
Wherein, the step 3 specifically comprises the following steps: the data in the bus data is split into the same number of data streams according to the number of enable signals required.
Wherein, the step 4 specifically comprises the following steps: filtering the shunted data flow through the matched filters of respective paths in real time, and then sending the filtered data flow to a decision device for decision according to a preset threshold value; the step 5 specifically comprises the following steps: when the threshold requirement is met, outputting a corresponding enable signal; otherwise, monitoring is continued until the condition is met.
Under the condition of high requirement on enabling reliability, a plurality of identical matched filters are used, and delay multiplexing is carried out on the input ends of the matched filters, so that the purpose of improving the reliability by redundant design is achieved.
(III) advantageous effects
The method of the invention reduces the complexity of the interface circuit, thereby reducing the complexity of system hardware, and simultaneously improving the expansibility of system functions through software configuration.
Drawings
FIG. 1 is a software block diagram of a data-driven space-based communication system enabling method according to the present invention.
FIG. 2 is a schematic diagram of a data flow of a data utilization policy module of the present invention.
Detailed Description
The invention relates to a data-driven space-based communication system enabling method, which is implemented together by software and hardware, wherein the hardware comprises a processor integrated with a bus chip, and referring to fig. 1, the software comprises a data receiving module, a data shunt multiplexing module, a data utilization strategy module and an enabling signal generating module; the data in the data receiving module is divided into data streams with the same number according to the number of the required enabling signals, each data stream enters the data in the processor to be judged by the strategy module, and then enters the enabling signal generating module to generate corresponding enabling signals, and the enabling signals comprise internal instructions left in the processor and external instructions output from the processor.
The processor is FPGA or FPGA + DSP.
When the space-based communication system needs to add a new enabling function, hardware does not need to be added, and only software or hardware updating is needed, and an instruction or a feature code is added into the data stream.
In order to make the architecture of the method more universal and real-time, referring to fig. 2, a data utilization strategy module is a digital matched filtering type data stream, N data streams output from a data shunt multiplexing module are respectively input into the data utilization strategy module, in the data utilization strategy module, the N data streams are respectively subjected to corresponding matched filtering, and then corresponding judgment is carried out, and finally the N data streams respectively enter an enabling signal generating module to generate corresponding enabling signals; wherein N is a natural number greater than or equal to 1.
The invention discloses a data-driven space-based communication system enabling method, which comprises the following steps:
step 1: and selecting and storing the template and the threshold value.
And selecting and storing a characteristic sequence or an instruction sequence meeting the requirements in advance as a template, and setting a proper judgment threshold value.
Step 2: a digital matched filter is provided.
The digital matched filter takes the local feature sequence as the tap coefficient of the filter.
The working process is as follows: when the received sequence slides over the local sequence, a correlation result is generated at each moment, when the phases of the received sequence and the local sequence are aligned, a correlation peak value is output, the correlation peak value is an autocorrelation function value when the sequence has zero phase shift, and the subsequent decision is to detect the correlation peak value.
Suppose that a sequence of length L is selected as the signature sequence, akFor the k sequence value, the local n characteristic sequence is
Where (n-k) is the (n-k) th impulse response sequence, the output of the matched filter is the autocorrelation function of the input sequence, and the corresponding impulse response function of the matched filter is
Wherein k, n and L are integers which are more than or equal to 0.
When the sequence is long, a partial matched filter or a parallel matched filter is adopted to ensure the real-time performance and reduce the resource occupation as much as possible.
And step 3: and (4) data shunting.
The data in the bus data is split into the same number of data streams according to the number of enable signals required.
And 4, step 4: and filtering and judging.
The data flow after being shunted passes through the matched filter of each path in real time, is filtered and then is sent to a decision device, and decision is carried out according to a preset threshold value.
And 5: an enable signal is output.
When the threshold requirement is met, outputting a corresponding enable signal; otherwise, monitoring is continued until the condition is met.
In addition, under the condition of extremely high requirement on the enabling reliability, a plurality of identical matched filters are used in the method, and the delay multiplexing is carried out at the input ends of the matched filters, so that the aim of improving the reliability by redundant design is fulfilled.
Claims (7)
1. A data-driven space-based communication system enabling method is implemented jointly by software and hardware, and is characterized in that the hardware comprises a processor integrated with a bus chip, and the software comprises a data receiving module, a data shunt multiplexing module, a data utilization strategy module and an enabling signal generating module; dividing data in the data receiving module into data streams with the same number according to the number of required enabling signals, judging the data entering the processor by using a strategy module for each data stream, and then entering an enabling signal generating module to generate corresponding enabling signals, wherein the enabling signals comprise internal instructions left in the processor and external instructions for outputting the processor;
the processor is FPGA or FPGA + DSP;
when the space-based communication system needs to add a new enabling function, hardware does not need to be added, only software or hardware updating is needed, and an instruction or a feature code is added into the data stream;
the data utilization strategy module is internally provided with a digital matched filtering type data stream, N paths of data streams output from the data shunt multiplexing module are respectively input into the data utilization strategy module, and the N paths of data streams respectively carry out corresponding matched filtering in the data utilization strategy module so as to carry out corresponding judgment and finally respectively enter the enabling signal generation module to generate corresponding enabling signals; wherein N is a natural number greater than or equal to 1.
2. The data-driven antenna-based communication system enabling method according to claim 1, comprising the steps of:
step 1: selecting and storing a template and a threshold;
step 2: setting a digital matched filter;
and step 3: data shunting;
and 4, step 4: filtering and judging;
and 5: an enable signal is output.
3. The method for enabling a data-driven space-based communication system according to claim 2, wherein the step 1 is specifically as follows: and selecting and storing a characteristic sequence or an instruction sequence meeting the requirements in advance as a template, and setting a proper judgment threshold value.
4. A data-driven space-based communication system enabling method according to claim 3, wherein the step 2 is specifically:
the digital matched filter takes the local characteristic sequence as a tap coefficient of the filter;
the working process is as follows: when the phase of the receiving sequence is aligned with that of the local sequence, a correlation peak value is output, the correlation peak value is an autocorrelation function value when the sequence has zero phase shift, and the subsequent decision is to detect the correlation peak value;
suppose that a sequence of length L is selected as the signature sequence, akFor the k sequence value, the local n characteristic sequence is
Where (n-k) is the (n-k) th impulse response sequence, the output of the matched filter is the autocorrelation function of the input sequence, and the corresponding impulse response function of the matched filter is
Wherein k, n and L are integers more than or equal to 0; when the sequence is long, a partial matched filter or a parallel matched filter is adopted to ensure the real-time performance and reduce the resource occupation as much as possible.
5. The method for enabling the data-driven space-based communication system according to claim 4, wherein the step 3 is specifically as follows: the data in the bus data is split into the same number of data streams according to the number of enable signals required.
6. The method for enabling a data-driven space-based communication system according to claim 5, wherein the step 4 is specifically: filtering the shunted data flow through the matched filters of respective paths in real time, and then sending the filtered data flow to a decision device for decision according to a preset threshold value; the step 5 specifically comprises the following steps: when the threshold requirement is met, outputting a corresponding enable signal; otherwise, monitoring is continued until the condition is met.
7. The method as claimed in claim 6, wherein in the case of high requirement for enabling reliability, a plurality of identical matched filters are used and time-delay-multiplexed at the input end of the matched filters, so as to achieve the purpose of improving reliability by redundant design.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865991A (en) * | 2009-04-17 | 2010-10-20 | 杭州中科微电子有限公司 | Layered GPS (Global Positioning System) signal parallel capturing method and module thereof |
| CN107360479A (en) * | 2017-07-17 | 2017-11-17 | 电子科技大学 | A kind of encryption method of multiple access access EPON |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2001084734A2 (en) * | 2000-05-01 | 2001-11-08 | Telefonaktiebolaget L M Ericsson (Publ) | Matched filter and receiver for mobile radio communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865991A (en) * | 2009-04-17 | 2010-10-20 | 杭州中科微电子有限公司 | Layered GPS (Global Positioning System) signal parallel capturing method and module thereof |
| CN107360479A (en) * | 2017-07-17 | 2017-11-17 | 电子科技大学 | A kind of encryption method of multiple access access EPON |
Non-Patent Citations (1)
| Title |
|---|
| "航天飞行器测控系统产品化工作探索";薛志超;《航天工业管理》;20150228(第2期);第7-10页 * |
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