CN108494499A - The modulation-demodulation device and method of signal in a kind of communication of space X ray - Google Patents
The modulation-demodulation device and method of signal in a kind of communication of space X ray Download PDFInfo
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- CN108494499A CN108494499A CN201810193984.8A CN201810193984A CN108494499A CN 108494499 A CN108494499 A CN 108494499A CN 201810193984 A CN201810193984 A CN 201810193984A CN 108494499 A CN108494499 A CN 108494499A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/90—Non-optical transmission systems, e.g. transmission systems employing non-photonic corpuscular radiation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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Abstract
The modulation-demodulation device and method of signal in a kind of communication of space X ray, information be encoded be modulated into low and high level be input to field generator for magnetic generate modulation magnetic field, it controls the electron bombardment difference target in more target X-ray tubes and generates characteristic X-ray outgoing, using the characteristic X-ray photon of different-energy as information carrier, it is received by X-ray detector, detectable signal is input to after preamplifier in energy discrimination device, energy discrimination is carried out to characteristic X-ray photon, it is counted by counter, count comparator is compared characteristic photon counting, signal output is demodulated by signal demodulating circuit.The present invention loads symbol with the characteristic X-ray of different-energy, and is screened to characteristic photon energy in receiving terminal, and load number of symbols is more, and characteristic photon intensity is high, can reduce ambient noise interference, has the characteristics that traffic rate is high, the bit error rate is low.
Description
Technical field
The invention belongs to space communications technique fields, and in particular to the modulation /demodulation of signal in a kind of communication of space X ray
Device and method.
Background technology
X-ray communicates this concept most earlier than 2007 by the Keith of the space research centers Ge Dade of U.S. NASA
Doctor Gendreau proposes that x-ray photon wavelength is short, and energy is high, when x-ray photon energy is more than 10keV, atmospheric pressure is less thanWhen Pa, X-ray transparent rate is up to 100%.This also mean that it is lower in pressure, close in the space environment of vacuum, X
The transmission of ray is almost zero-decrement, this provides a kind of low-power consumption, high-transmission efficiency, at a distance for field of deep space communication
Information transmission scheme.
It has carried out at present in the X-ray communication system of ground experiment, U.S. Keith doctors Gendreau are by signal of communication
On a ultraviolet LED, the modulation ultraviolet light of generation bombards photocathode, and electron emission is produced through photoelectric effect, sends out for load
Bombardment anode target material generates x-ray signal after radio is doubled by electron multiplier.This scheme is in US Airways space flight
Preliminary authentication has been obtained in 600 meters of vacuum transmission pipelines of office.Chinese Academy of Sciences's Xi'an optical precision optical machinery is ground
Study carefully proposed based on grid-controlled X-ray modulation source, intensity modulated is carried out to exit Xray, is realized in 6 meters of long vacuum pipes
The voice communication of 64kbit/s.
To sum up, it can be seen that current X-ray communication system both domestic and external mostly uses greatly intensity modulated mode：1）Excitaton source control
System generates electronics using ultraviolet light/laser etc. and the interaction of material, then generates X-ray by electronic target.By to swashing
It rises（Ultraviolet light/laser）Intensity（Ultraviolet light）And break-make（Pulse laser）The modulation to X-ray is realized in control；2）Grid control
System, on the basis of Traditional DC Coolidge tube, between a cathode and an anode close to place one voltage control of setting of cathode
Grid processed.By changing grid voltage to which control is with/without electron bombardment metal anode target, the modulation to X-ray is realized.
The limitation of which is：1）Number of symbols is restricted, and is only capable of loading according to the mode generated with/without X-ray
" 0 ", " 1 " two kinds of symbols；2）Ambient noise influences greatly, when end of probe is to photon detection, to detect full spectrum light subnumber mesh,
Effectively to evade ambient noise to Control of Bit Error Rate, number of photons decision threshold is required big.
The above X-ray communication system is based on intensity modulated mode, and signal element number is by a fixed limit in this mode
System is detected in end of probe needs to that all can measure a section photon, and signal-to-noise ratio is low, within each examination period, needs high light sub
It counts to ensure bit error rate parameter.Therefore, the new modulating and demodulating signal mode that can apply to X-ray communication is studied with weight
Want meaning.
Invention content
The present invention is directed to deficiency in the prior art, provides the modulation-demodulation device of signal in a kind of communication of space X ray
And method.
To achieve the above object, the present invention uses following technical scheme：
The modulation-demodulation device of signal in a kind of communication of space X ray, which is characterized in that including：Modulator, signal condition electricity
Road, field generator for magnetic, more target X-ray tubes, x-ray collimator, X-ray focusing lens, X-ray detector, preposition amplification
Device, energy discrimination device, count comparator, signal demodulating circuit；Information successively by modulator, signal conditioning circuit processing after
It is input to field generator for magnetic, field generator for magnetic generates modulation magnetic field, controls more target X-ray tubes generation characteristic X-rays and goes out
It penetrates, characteristic X-ray is received after x-ray collimator, X-ray focusing lens by X-ray detector successively, and detectable signal passes through
It is input to after preamplifier in energy discrimination device, energy discrimination is carried out to characteristic X-ray photon, and counted by counter, counted
Number comparator is compared characteristic photon counting, and signal output is demodulated by signal demodulating circuit.
To optimize above-mentioned technical proposal, the concrete measure taken further includes：
The modulator carries out coded modulation to information, loads 3 kinds of digital signal symbols, is " 0 ", " 1 ", " 2 ", signal tune respectively
Reason circuit generates varying level according to symbol type and is input to field generator for magnetic, and incoming level includes negative level, zero level, just
Level, field generator for magnetic generate the magnetic deflection field of different magnetic induction intensity under the control of incoming level.
More target X-ray tubes include 3 kinds of targets, are titanium, copper, molybdenum respectively, and electronics is deflecting in more target X-ray tubes
It is deflected by Lorentz force action track in magnetic field, bombardment target region generates characteristic X-ray, with the feature of different-energy
X-ray photon is emitted as carrier signal after x-ray collimator collimates, and is detected and is received by X-ray detector.
When digital signal symbol is " 0 ", incoming level is negative level, and electron bombardment titanium target region generates the first feature
Photon；When digital signal symbol is " 1 ", incoming level is zero level, and electron bombardment copper target region generates second of characteristic light
Son；When digital signal symbol is " 2 ", incoming level is positive level, and electron bombardment molybdenum target region generates the third characteristic photon.
The X-ray detector is tellurium-zinc-cadmium detector.
The energy discrimination device screens signal amplitude, and characteristic X-ray count information is input to different countings
In device, counter shares 3, within each signal screening period, records the characteristic X-ray photon counting of 3 kinds of targets respectively, leads to
The corresponding symbol of count comparator output characteristic photon count maximum is crossed, and to counter count resets.
The energy discrimination device screens signal amplitude, and energy is divided into three sections, according to the K of selection target
It is characteristic energy, energy section is respectively divided into 4~5keV, 8~9keV, 17~18keV, each energy section is by 1
Counter records number of photons, a total of 3 of counter export the corresponding code of characteristic photon count maximum by count comparator
Member, and to counter count resets, repeat in this way, output signal symbol series.
In addition, it is also proposed that it is a kind of using above-mentioned space X ray communicate in signal modulation-demodulation device modulation /demodulation
Method, which is characterized in that include the following steps：
1）Modulator will input digital signal with carrier signal modulation into high-frequency modulation signal, and modulated signal is input to signal condition
Low and high level is generated in circuit and is input to field generator for magnetic, and low and high level includes negative level, zero level, positive level；
2）Field generator for magnetic generates magnetic deflection field and acts on more target X-ray tubes, toward anode movement in more target X-ray tubes
Trajectory of electron motion changes, and electronics bombards different target locations after deflection and generates different characteristic X-ray photons, with
The characteristic X-ray photon of different-energy is emitted as information carrier, poly- by x-ray collimator collimation and X-ray focusing lens
It is defocused to be received by X-ray detector；
3）Detectable signal is input to after preamplifier in energy discrimination device by X-ray detector, and energy discrimination device is every
In a signal screening period, according to characteristic photon energy binned energy section, the photon energy section detected is screened,
Each energy section is respectively with 1 counter records number of photons, the photon counting acquisition code in more each energy section of count comparator
First signal, signal demodulating circuit demodulate output information.
The beneficial effects of the invention are as follows：3 kinds of different characteristic X-rays are finally generated using control magnetic field, with different-energy
Characteristic X-ray photon loads 3 kinds of symbols, increases effectively communication information amount, improves communication data rate；It can be to feature
Energy signal is effectively identified that, since intensity is high in entire X-ray energy spectrum for characteristic photon signal, ambient noise interference is small,
It is effective to improve signal-to-noise ratio, reduce the bit error rate.
Description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Fig. 2 be the present invention by digital signal modulated at low and high level schematic diagram.
Fig. 3 is X-ray tube target distribution map of the present invention.
Reference numeral is as follows：1- titanium Ti targets, 2- copper Cu targets, 3- molybdenum Mo targets.
Specific implementation mode
In conjunction with the accompanying drawings, the present invention is further explained in detail.
The modulation-demodulation device of signal in space X ray communication as shown in Figure 1, including modulator, signal conditioning circuit,
Field generator for magnetic, more target X-ray tubes, x-ray collimator, X-ray focusing lens, X-ray detector, preamplifier,
Energy discrimination device, count comparator, signal demodulating circuit.
As shown in Fig. 2, modulator modulates information coding, 3 kinds of digital signal symbols are loaded, are respectively " 0 ", " 1 ", " 2 ".
Signal conditioning circuit generates varying level according to symbol type and is input to field generator for magnetic, and incoming level includes negative level, zero
Level, positive level.Digital signal encoding " 0 ", corresponding negative level are corresponding to generate the first characteristic photon；Symbol " 1 ", corresponding zero
Level, it is corresponding to generate second of characteristic photon；Symbol " 2 ", corresponding positive level are corresponding to generate the third characteristic photon.
As shown in figure 3, field generator for magnetic generates the magnetic deflection field of different magnetic induction intensity under incoming level control, it is more
Target X-ray tube includes three kinds of targets, is titanium Ti, copper Cu, molybdenum Mo respectively, in pipe electronics in magnetic deflection field by Lorentz masterpiece
It is deflected with movement locus, bombards more target X-ray tubes and generate characteristic X-ray.When incoming level is negative level, electronics is main
Bombard titanium Ti target regions；When incoming level is zero level, electronics mainly bombards copper Cu target regions；When incoming level is positive level,
Electronics mainly bombards molybdenum Mo target regions.Using the characteristic X-ray photon of different-energy as carrier signal, collimated outgoing, by X
Ray detector detection receives.
X-ray detector is tellurium-zinc-cadmium detector, and detection information is input to energy discrimination device through preamplifier.Each
In the signal screening period, energy discrimination device screens signal amplitude, and energy is divided into three sections, according to selection target
K systems characteristic energy, energy section is respectively divided into 4~5keV, 8~9keV, 17~18keV, each energy section is by 1
It is corresponding to export characteristic photon count maximum by count comparator for a counter records number of photons, a total of 3 of counter
Symbol, and to counter count resets, repeat in this way, output signal symbol series.Finally, by signal demodulating circuit
Demodulate output information.
Using the modulation-demo-demodulation method of the device, include the following steps：
Step 1：Signal conditioning circuit converts input signal to low and high level and is input to control device；
Step 2：Control device changes the trajectory of electron motion in more target X-ray tubes, and electronic target is made to generate characteristic X-ray light
Son is emitted using the characteristic X-ray photon of different-energy as information carrier；
Step 3：Receiving terminal X-ray detector carries out energy discrimination, demodulated circuit output information to x-ray photon.
In step 1, input digital signal is modulated into high-frequency modulation signal with carrier signal, and modulated signal is input to signal
Low and high level is generated in modulate circuit and is input to control device, and wherein low and high level includes negative level, zero level, positive level.
In step 2, field generator for magnetic generates magnetic deflection field, toward the electronics of anode movement at this in more target X-ray tubes
Regional movement track can change, and electronics bombards more target X-ray tube different locations after deflection and generates different characteristic X-ray
Photon is emitted using the characteristic X-ray photon of different-energy as information carrier.
In step 3, the X-ray detector used has preferable time resolution and energy resolution to x-ray photon.
Within each signal screening period, according to characteristic photon energy binned energy section, the photon energy section detected is carried out
It screens, each energy section is respectively with 1 counter records number of photons, the photon counting acquisition symbol letter in more each energy section
Number, demodulate output information.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as the protection of the present invention
Range.
Claims (8)
1. the modulation-demodulation device of signal in a kind of space X ray communication, which is characterized in that including：Modulator, signal condition electricity
Road, field generator for magnetic, more target X-ray tubes, x-ray collimator, X-ray focusing lens, X-ray detector, preposition amplification
Device, energy discrimination device, count comparator, signal demodulating circuit；Information successively by modulator, signal conditioning circuit processing after
It is input to field generator for magnetic, field generator for magnetic generates modulation magnetic field, controls more target X-ray tubes generation characteristic X-rays and goes out
It penetrates, characteristic X-ray is received after x-ray collimator, X-ray focusing lens by X-ray detector successively, and detectable signal passes through
It is input to after preamplifier in energy discrimination device, energy discrimination is carried out to characteristic X-ray photon, and counted by counter, counted
Number comparator is compared characteristic photon counting, and signal output is demodulated by signal demodulating circuit.
2. the modulation-demodulation device of signal in a kind of space X ray communication as described in claim 1, it is characterised in that：It is described
Modulator carries out coded modulation to information, loads 3 kinds of digital signal symbols, is " 0 ", " 1 ", " 2 ", signal conditioning circuit root respectively
Varying level is generated according to symbol type and is input to field generator for magnetic, and incoming level includes negative level, zero level, positive level, magnetic
Field generating means generates the magnetic deflection field of different magnetic induction intensity under the control of incoming level.
3. the modulation-demodulation device of signal in a kind of space X ray communication as claimed in claim 2, it is characterised in that：It is described
More target X-ray tubes include 3 kinds of targets, are titanium, copper, molybdenum respectively, in more target X-ray tubes electronics in magnetic deflection field by long-range navigation
Hereby force effect movement locus deflects, and bombardment target region generates characteristic X-ray, is made with the characteristic X-ray photon of different-energy
It for carrier signal, is emitted after x-ray collimator collimates, is detected and received by X-ray detector.
4. the modulation-demodulation device of signal in a kind of space X ray communication as claimed in claim 3, it is characterised in that：Number
When signal element is " 0 ", incoming level is negative level, and electron bombardment titanium target region generates the first characteristic photon；Digital signal
When symbol is " 1 ", incoming level is zero level, and electron bombardment copper target region generates second of characteristic photon；Digital signal symbol
For " 2 " when, incoming level is positive level, and electron bombardment molybdenum target region generates the third characteristic photon.
5. the modulation-demodulation device of signal in a kind of space X ray communication as described in claim 1, it is characterised in that：The X
Ray detector is tellurium-zinc-cadmium detector.
6. the modulation-demodulation device of signal in a kind of space X ray communication as claimed in claim 4, it is characterised in that：It is described
Energy discrimination device screens signal amplitude, and characteristic X-ray count information is input in different counters, and counter is total
There are 3, within each signal screening period, records the characteristic X-ray photon counting of 3 kinds of targets respectively, pass through count comparator
The corresponding symbol of characteristic photon count maximum is exported, and to counter count resets.
7. the modulation-demodulation device of signal in a kind of space X ray communication as claimed in claim 6, it is characterised in that：It is described
Energy discrimination device screens signal amplitude, and energy is divided into three sections, according to selection target K systems characteristic energy,
Energy section is respectively divided into 4~5keV, 8~9keV, 17~18keV, each energy section is by 1 counter records light
Subnumber, a total of 3 of counter export the corresponding symbol of characteristic photon count maximum by count comparator, and to counting
Device count resets, repeat in this way, output signal symbol series.
8. the modulation /demodulation side of the modulation-demodulation device of signal in a kind of communication using space X ray as described in claim 1
Method, which is characterized in that include the following steps：
1）Modulator will input digital signal with carrier signal modulation into high-frequency modulation signal, and modulated signal is input to signal condition
Low and high level is generated in circuit and is input to field generator for magnetic, and low and high level includes negative level, zero level, positive level；
2）Field generator for magnetic generates magnetic deflection field and acts on more target X-ray tubes, toward anode movement in more target X-ray tubes
Trajectory of electron motion changes, and electronics bombards different target locations after deflection and generates different characteristic X-ray photons, with
The characteristic X-ray photon of different-energy is emitted as information carrier, poly- by x-ray collimator collimation and X-ray focusing lens
It is defocused to be received by X-ray detector；
3）Detectable signal is input to after preamplifier in energy discrimination device by X-ray detector, and energy discrimination device is every
In a signal screening period, according to characteristic photon energy binned energy section, the photon energy section detected is screened,
Each energy section is respectively with 1 counter records number of photons, the photon counting acquisition code in more each energy section of count comparator
First signal, signal demodulating circuit demodulate output information.
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Cited By (13)
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| CN110189847A (en) * | 2019-05-10 | 2019-08-30 | 北方夜视技术股份有限公司 | Space X ray communication system based on lobster eye x-ray imaging optical device |
| CN110504147A (en) * | 2019-08-29 | 2019-11-26 | 南京航空航天大学 | It is a kind of to communicate the x-ray source based on energy load signal for space X ray |
| CN112260753A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Gamma-ray energy modulation communication system and method |
| CN112260764A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Communication system and method based on rotary radioactive source |
| CN112260765A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Gamma-ray communication system and communication method |
| CN112259275A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Communication system and communication method under electromagnetic shielding environment |
| CN112260752A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Gamma ray intensity modulation communication system and method |
| CN112260766A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Ray deflection communication system and communication method |
| CN112751620A (en) * | 2020-12-17 | 2021-05-04 | 南京航空航天大学 | Method, device and system for receiving X-ray signals of different energy load signals |
| CN112787720A (en) * | 2021-01-21 | 2021-05-11 | 南京航空航天大学 | Spatial X-ray communication method and device based on hybrid modulation |
| CN113726429A (en) * | 2021-08-23 | 2021-11-30 | 南京航空航天大学 | Signal receiving method and device for reducing X-ray communication bit error rate |
| CN114244433A (en) * | 2021-12-08 | 2022-03-25 | 南京航空航天大学 | Method for realizing navigation and communication information fusion based on multiple characteristic signals |
| CN114301540A (en) * | 2021-12-31 | 2022-04-08 | 南京航空航天大学 | X-ray communication method and device based on spatial superposition pulse amplitude modulation |
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| CN110189847A (en) * | 2019-05-10 | 2019-08-30 | 北方夜视技术股份有限公司 | Space X ray communication system based on lobster eye x-ray imaging optical device |
| CN110189847B (en) * | 2019-05-10 | 2021-06-29 | 北方夜视技术股份有限公司 | Space X-ray communication system based on lobster eye X-ray optical device |
| CN110504147A (en) * | 2019-08-29 | 2019-11-26 | 南京航空航天大学 | It is a kind of to communicate the x-ray source based on energy load signal for space X ray |
| CN110504147B (en) * | 2019-08-29 | 2020-12-01 | 南京航空航天大学 | X-ray source based on energy load signal for space X-ray communication |
| CN112260766A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Ray deflection communication system and communication method |
| CN112260753A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Gamma-ray energy modulation communication system and method |
| CN112259275A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Communication system and communication method under electromagnetic shielding environment |
| CN112260752A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Gamma ray intensity modulation communication system and method |
| CN112260764A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Communication system and method based on rotary radioactive source |
| CN112259275B (en) * | 2020-10-19 | 2022-02-11 | 中国核动力研究设计院 | Communication system and communication method under electromagnetic shielding environment |
| CN112260753B (en) * | 2020-10-19 | 2022-02-01 | 中国核动力研究设计院 | Gamma-ray energy modulation communication system and method |
| CN112260765A (en) * | 2020-10-19 | 2021-01-22 | 中国核动力研究设计院 | Gamma-ray communication system and communication method |
| CN112260766B (en) * | 2020-10-19 | 2022-01-18 | 中国核动力研究设计院 | Ray deflection communication system and communication method |
| CN112751620A (en) * | 2020-12-17 | 2021-05-04 | 南京航空航天大学 | Method, device and system for receiving X-ray signals of different energy load signals |
| CN112787720A (en) * | 2021-01-21 | 2021-05-11 | 南京航空航天大学 | Spatial X-ray communication method and device based on hybrid modulation |
| CN113726429A (en) * | 2021-08-23 | 2021-11-30 | 南京航空航天大学 | Signal receiving method and device for reducing X-ray communication bit error rate |
| CN114244433A (en) * | 2021-12-08 | 2022-03-25 | 南京航空航天大学 | Method for realizing navigation and communication information fusion based on multiple characteristic signals |
| CN114301540A (en) * | 2021-12-31 | 2022-04-08 | 南京航空航天大学 | X-ray communication method and device based on spatial superposition pulse amplitude modulation |
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