CN107689815A - A kind of MSK band spread receivers Adaptive Anti-jamming detection threshold determines method - Google Patents
A kind of MSK band spread receivers Adaptive Anti-jamming detection threshold determines method Download PDFInfo
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- CN107689815A CN107689815A CN201610630435.3A CN201610630435A CN107689815A CN 107689815 A CN107689815 A CN 107689815A CN 201610630435 A CN201610630435 A CN 201610630435A CN 107689815 A CN107689815 A CN 107689815A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/71—Interference-related aspects the interference being narrowband interference
- H04B1/7102—Interference-related aspects the interference being narrowband interference with transform to frequency domain
Abstract
The invention discloses a kind of MSK band spread receivers Adaptive Anti-jamming detection threshold to determine method, is realized by A/D data cache modules, windowing processing module, time-frequency conversion module, amplitude spectral line average determining module and detection threshold determining module.A/D data cache modules carry out caching process to the A/D gathered datas of spread-spectrum signal；Windowing processing module is to data cached carry out windowing process；Time-frequency conversion module carries out time-frequency conversion to the data after windowing process；Detection threshold determining module is determined to Adaptive Anti-jamming detection threshold.The present invention solves the problems, such as that the anti-interference detection threshold of tradition determines that method applicability is poor.
Description
Technical field
The present invention relates to a kind of anti-interference detection threshold to determine method, and particularly a kind of MSK band spread receivers adaptively resist
Interference detection threshold determines method.
Background technology
MSK band spread receivers need to carry out despreading processing to the spread-spectrum signal received, so as to recover raw information, when
When the power of narrow-band interference signal is much larger than the power of spread-spectrum signal, the processing gain for only relying on spread spectrum system is done to suppress arrowband
Disturb and be difficult to reach good performance, it is therefore desirable to disturbed using anti-interference method to suppress arrowband, and anti-interference detection threshold
It is determined that directly affect the antijamming capability of band spread receiver.Traditional anti-interference detection threshold determines that method is examined using fixed spectral line
The method for surveying thresholding, i.e., according to measured value, a fixed spectral line detection threshold is chosen, the method is realized simply, but adaptability
It is poor.
The content of the invention
Present invention aims at providing a kind of MSK band spread receivers Adaptive Anti-jamming detection threshold to determine method, solve
The anti-interference detection threshold of tradition determines the problem of method applicability is poor.
A kind of MSK band spread receivers Adaptive Anti-jamming detection threshold determines method, and it is concretely comprised the following steps：
The first step builds Adaptive Anti-jamming detection threshold and determines system
Adaptive Anti-jamming detection threshold determines system, including：A/D data cache modules, windowing processing module, time-frequency conversion mould
Block, amplitude spectral line average determining module and detection threshold determining module；The function of the A/D data cache modules is：To spread spectrum
The A/D gathered datas of signal carry out caching process；The function of windowing processing module is：To data cached carry out windowing process；When
The function of frequency conversion module is：Time-frequency conversion is carried out to the data after windowing process；The function of detection threshold determining module is：It is right
Adaptive Anti-jamming detection threshold is determined.Above-mentioned module is run in fpga chip.
Second step A/D data cache modules carry out caching process to the A/D gathered datas of spread-spectrum signal
A/D data cache modules produce sampling clock, at the control A/D chips spread-spectrum signal is acquired, sampled point
Number is, A/D data cache modules by thisIndividual sampled value,Cached.
Sampling clockSelection principle：,For the pseudo- bit rate of spread-spectrum signal.
3rd step windowing processing module is to data cached carry out windowing process
Windowing processing module is dataWith Hamming window functionTime domain product calculation is done, is obtained；WhenWhen, Hamming window function, other situations。
4th step time-frequency conversion module carries out time-frequency conversion to the data after windowing process
Time-frequency conversion module is to dataCarry out FFT：
Time domain dataIt is transformed to frequency domain data,,For frequency domain points index value.
5th step detection threshold determining module is determined to Adaptive Anti-jamming detection threshold
Detection threshold determining module is to frequency domain dataModulo operation is carried out, obtains frequency domain dataAmplitude spectrum
Line, it is rightIndividual amplitude spectral line, which takes, is worth to amplitude spectrum line average；Use formula：, adaptively resisted
Interference detection threshold, whereinIt is minimum threshold value, is the amplitude spectral line of signal when not interfering with, passes through theoretical calculation
Obtain；It is the coefficient of decay, takes。
So far, it is determined that MSK band spread receiver Adaptive Anti-jamming detection thresholds.
Present method solves the anti-interference detection threshold method applicability of tradition it is poor the problem of, simulating, verifying is theoretically demonstrate,proved
Understand the validity and feasibility of this method, and this method is tested on MSK band spread receiver demonstration and verification plates, examination
Test result and show that this method can be determined to Adaptive Anti-jamming detection threshold, and the Adaptive Anti-jamming detection door determined
Limit value is accurate, meets system requirements.
Embodiment
A kind of MSK band spread receivers Adaptive Anti-jamming detection threshold determines method, and it is concretely comprised the following steps：
The first step builds Adaptive Anti-jamming detection threshold and determines system
Adaptive Anti-jamming detection threshold determines system, including：A/D data cache modules, windowing processing module, time-frequency conversion mould
Block, amplitude spectral line average determining module and detection threshold determining module；The function of the A/D data cache modules is：To spread spectrum
The A/D gathered datas of signal carry out caching process；The function of windowing processing module is：To data cached carry out windowing process；When
The function of frequency conversion module is：Time-frequency conversion is carried out to the data after windowing process；The function of detection threshold determining module is：It is right
Adaptive Anti-jamming detection threshold is determined.Above-mentioned module is run in fpga chip.
Second step A/D data cache modules carry out caching process to the A/D gathered datas of spread-spectrum signal
A/D data cache modules produce sampling clock, at the control A/D chips spread-spectrum signal is acquired, sampled point
Number is, A/D data cache modules by thisIndividual sampled value,Cached.
Sampling clockSelection principle：,For the pseudo- bit rate of spread-spectrum signal.
3rd step windowing processing module is to data cached carry out windowing process
Windowing processing module is dataWith Hamming window functionTime domain product calculation is done, is obtained；WhenWhen, Hamming window function, other situations。
4th step time-frequency conversion module carries out time-frequency conversion to the data after windowing process
Time-frequency conversion module is to dataCarry out FFT：
Time domain dataIt is transformed to frequency domain data,,For frequency domain points index value.
5th step detection threshold determining module is determined to Adaptive Anti-jamming detection threshold
Detection threshold determining module is to frequency domain dataModulo operation is carried out, obtains frequency domain dataAmplitude spectrum
Line, it is rightIndividual amplitude spectral line, which takes, is worth to amplitude spectrum line average；Use formula：, adaptively resisted
Interference detection threshold, whereinIt is minimum threshold value, is the amplitude spectral line of signal when not interfering with, can be counted by theory
Calculate and obtain；It is the coefficient of decay, generally takes。
So far MSK band spread receiver Adaptive Anti-jamming detection thresholds are determined.
Claims (1)
1. a kind of MSK band spread receivers Adaptive Anti-jamming detection threshold determines method, it is characterised in that concretely comprises the following steps：
The first step builds Adaptive Anti-jamming detection threshold and determines system
Adaptive Anti-jamming detection threshold determines system, including：A/D data cache modules, windowing processing module, time-frequency conversion mould
Block, amplitude spectral line average determining module and detection threshold determining module；The function of the A/D data cache modules is：To spread spectrum
The A/D gathered datas of signal carry out caching process；The function of windowing processing module is：To data cached carry out windowing process；When
The function of frequency conversion module is：Time-frequency conversion is carried out to the data after windowing process；The function of detection threshold determining module is：It is right
Adaptive Anti-jamming detection threshold is determined；Above-mentioned module is run in fpga chip；
Second step A/D data cache modules carry out caching process to the A/D gathered datas of spread-spectrum signal
A/D data cache modules produce sampling clock, at the control A/D chips spread-spectrum signal is acquired, sampled point
Number is, A/D data cache modules by thisIndividual sampled value,Cached；
Sampling clockSelection principle：,For the pseudo- bit rate of spread-spectrum signal；
3rd step windowing processing module is to data cached carry out windowing process
Windowing processing module is dataWith Hamming window functionTime domain product calculation is done, is obtained；WhenWhen, Hamming window function, other situations；
4th step time-frequency conversion module carries out time-frequency conversion to the data after windowing process
Time-frequency conversion module is to dataCarry out FFT：
Time domain dataIt is transformed to frequency domain data,,For frequency domain points index value；
5th step detection threshold determining module is determined to Adaptive Anti-jamming detection threshold
Detection threshold determining module is to frequency domain dataModulo operation is carried out, obtains frequency domain dataAmplitude spectral line,
It is rightIndividual amplitude spectral line, which takes, is worth to amplitude spectrum line average；Use formula：, obtain Adaptive Anti-jamming
Detection threshold, whereinIt is minimum threshold value, is the amplitude spectral line of signal when not interfering with, is obtained by theoretical calculation；It is the coefficient of decay, takes；
So far MSK band spread receiver Adaptive Anti-jamming detection thresholds are determined.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109100687A (en) * | 2018-10-29 | 2018-12-28 | 北京遥感设备研究所 | A kind of radar equipment LFM pulse signal PSLR parameter determination method |
| CN111641422A (en) * | 2020-05-20 | 2020-09-08 | 北京遥感设备研究所 | System and method for determining self-adaptive anti-interference detection threshold of high-dynamic digital receiver |
| CN112636781A (en) * | 2020-12-23 | 2021-04-09 | 电子科技大学 | Method for detecting digital modulation optimal interference signal |
| CN113872636A (en) * | 2021-09-24 | 2021-12-31 | 天津津航计算技术研究所 | Code anti-interference method based on adaptive threshold dynamic adjustment |
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| US5671247A (en) * | 1995-10-24 | 1997-09-23 | Motorola, Inc. | Method and apparatus for interference suppression in spread spectrum signals |
| CN101986634A (en) * | 2010-09-26 | 2011-03-16 | 北京大学 | Time-frequency expanding anti-jamming method, equipment and system based on lapped transformation algorithm |
| CN102121991A (en) * | 2010-01-08 | 2011-07-13 | 郑州威科姆科技股份有限公司 | Interference suppression method and device based on BeiDou-I satellite signal reception |
| CN102739272A (en) * | 2012-06-26 | 2012-10-17 | 哈尔滨工程大学 | Channelized receiver sub-channel real-time frequency spectrum synthesis method based on field programmable gate array (FPGA) |
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Patent Citations (4)
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| US5671247A (en) * | 1995-10-24 | 1997-09-23 | Motorola, Inc. | Method and apparatus for interference suppression in spread spectrum signals |
| CN102121991A (en) * | 2010-01-08 | 2011-07-13 | 郑州威科姆科技股份有限公司 | Interference suppression method and device based on BeiDou-I satellite signal reception |
| CN101986634A (en) * | 2010-09-26 | 2011-03-16 | 北京大学 | Time-frequency expanding anti-jamming method, equipment and system based on lapped transformation algorithm |
| CN102739272A (en) * | 2012-06-26 | 2012-10-17 | 哈尔滨工程大学 | Channelized receiver sub-channel real-time frequency spectrum synthesis method based on field programmable gate array (FPGA) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109100687A (en) * | 2018-10-29 | 2018-12-28 | 北京遥感设备研究所 | A kind of radar equipment LFM pulse signal PSLR parameter determination method |
| CN111641422A (en) * | 2020-05-20 | 2020-09-08 | 北京遥感设备研究所 | System and method for determining self-adaptive anti-interference detection threshold of high-dynamic digital receiver |
| CN112636781A (en) * | 2020-12-23 | 2021-04-09 | 电子科技大学 | Method for detecting digital modulation optimal interference signal |
| CN113872636A (en) * | 2021-09-24 | 2021-12-31 | 天津津航计算技术研究所 | Code anti-interference method based on adaptive threshold dynamic adjustment |
| CN113872636B (en) * | 2021-09-24 | 2022-11-18 | 天津津航计算技术研究所 | Code anti-interference method based on adaptive threshold dynamic adjustment |
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