CN105572717A - Avionic device atmosphere neutron fluence rate calculating method and system thereof - Google Patents
Avionic device atmosphere neutron fluence rate calculating method and system thereof Download PDFInfo
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Abstract
The invention relates to an avionic device atmosphere neutron fluence rate calculating method and a system thereof. The method comprises the following steps of detecting a technology size of target equipment and acquiring a neutron energy threshold value causing the target equipment to generate a single particle effect; acquiring highest neutron energy causing the target equipment to generate an atmosphere neutron single particle effect; through an atmosphere neutron fluence rate distribution condition, calculating an atmosphere neutron fluence rate in a range from the energy threshold value to the highest energy. Through the technical scheme of the invention, according to the technology size of each target equipment, the corresponding neutron energy threshold value which causes the target equipment to generate the single particle effect can be acquired so that integration can be performed according to the energy threshold value so as to acquire the atmosphere neutron fluence rate corresponding to the target equipment; and then according to the atmosphere neutron fluence rate, a neutron single particle event rate is calculated; and through the single particle event rate, an atmosphere neutron protection index of the target equipment is accurately assessed.
Description
Technical field
The present invention relates to neutron fluence rate technical field, in particular to avionic device atmospheric neutron fluence rate computing method and avionic device atmospheric neutron fluence rate computing system.
Background technology
Air environment with the complicated microelectronic component of storage organization will inevitably meet with the high energy atmospheric neutron of about every square centimeter of 300 ~ 18000 1MeV ~ 1000MeV per hour in the place environment of flying height (3000 ~ 20000 meters).These high-energy neutrons can penetrate cabin skin, beat on the kernel instruction control module or critical data storage unit of air environment, produce soft error and hard fault, cause navigating (navigation neceiver), radar-probing system (Active Phased Array Radar), data network (the AFDX network switch), communication (optical fiber/bus), high speed computer system, avionic device, engine (FADEC), telex system, automatic Pilot technology, flight alarm, display screen, there is blank screen in other flight system etc. containing electron device, crash, reset, restart, loss of data, the safety hazards such as order loss.
Up to now, domestic to air environment meet with in place environment high-energy neutron do not carry out specific aim protection with evaluate.In order to set up protection and appraisement system, quantitatively characterizing must be carried out to the harm of atmospheric neutron single particle effect.And atmospheric neutron fluence rate is the important parameter of harm quantitatively characterizing.
Since nineteen fifty, obtain 40000 feet (approximating 12160m) by various data actual measurement, the air power spectrum in the place that latitude is 45 °.More than 10MeV atmospheric neutron fluence rate is about 6000#/cm
2h, 1-10MeV atmospheric neutron fluence rate is 3200#/cm
2h, more than 1MeV atmospheric neutron fluence rate is 9200#/cm
2h.Visible, the common span of energy range is that 1MeV is extremely just infinite, 10MeV to just infinite or 1MeV to 10MeV.
In general, process is greater than to the Sensitive Apparatus of 150nm, being greater than 10MeV neutron is the main cause causing single particle effect.But process is less than to the device of 150nm, the contribution of the neutron of energy within the scope of 1-10MeV to single particle effect is very important.For different components, cause the energy threshold of neutron single-particle effect different, may be 3MeV or 4MeV, corresponding energy range is then that 3MeV is extremely just infinite or 4MeV is extremely just infinite, and these spans not included in the middle of the energy span of prior art, so it is inaccurate for only calculating atmospheric neutron fluence rate for some device according to the energy span of prior art.
Summary of the invention
Technical matters to be solved by this invention is, how to obtain the atmospheric neutron fluence rate of target device exactly, thus assesses the protection of the atmospheric neutron of target device on this basis.
For this purpose, the present invention proposes a kind of avionic device atmospheric neutron fluence rate computing method, comprising: the process detecting target device, obtain the neutron energy threshold value causing described target device generation single particle effect; Obtain the neutron highest energy causing described target device generation atmospheric neutron single particle effect; Utilize atmospheric neutron fluence rate distribution situation, calculate from described energy threshold to the atmospheric neutron fluence rate within the scope of described highest energy.
Preferably, obtain cause target device occur atmospheric neutron single particle effect time neutron highest energy specifically comprise: according to the responsive area of section of the single particle effect incident rate of described target device, described target device, described target device do not protect total number of bits, calculate the minimum fluence rate of described target device; The energy that in sub-power spectrum, inquiry is corresponding with described minimum fluence rate is in a standard as described highest energy.
Preferably, described atmospheric neutron fluence rate distribution situation is represented by following formula: dN/dE=0.346E
-0.922× exp (-0.0152 (lnE)), wherein, N is neutron flux, and E is neutron energy, and the application conditions of this formula is north latitude 45 °, 12160m height.
Preferably, with described energy threshold for lower limit of integral, for upper limit of integral, integral and calculating is carried out to described formula with described highest energy, obtain described atmospheric neutron fluence rate.
Preferably, also comprise: according to described atmospheric neutron fluence rate, protection assessment is carried out to described target device.
Preferably, also comprise: the ratio calculating neutron fluence rate when described atmospheric neutron fluence rate and neutron energy scope are 1-10MeV, record and store described ratio.
The invention allows for a kind of avionic device atmospheric neutron fluence rate computing system, comprising: detecting unit, for detecting the process of target device, obtaining the neutron energy threshold value causing described target device generation single particle effect; Acquiring unit, for obtaining the neutron highest energy causing described target device generation atmospheric neutron single particle effect; Computing unit, for utilizing atmospheric neutron fluence rate distribution situation, calculates from described energy threshold to the atmospheric neutron fluence rate within the scope of described highest energy.
Preferably, described acquiring unit comprises: computation subunit, for the responsive area of section of the single particle effect incident rate according to described target device, described target device, described target device do not protect total number of bits, calculate the minimum fluence rate of described target device; And inquiry subelement, for the energy corresponding with described minimum fluence rate of inquiry in sub-power spectrum in a standard as described highest energy.
Preferably, described atmospheric neutron fluence rate distribution situation is represented by following formula: dN/dE=0.346E
-0.922× exp (-0.0152 (lnE)), wherein, N is neutron flux, and E is neutron energy, and the application conditions of this formula is north latitude 45 °, 12160m height.
Preferably, described computing unit be used for described energy threshold for lower limit of integral, for upper limit of integral, integral and calculating is carried out to described formula with described highest energy, obtains described atmospheric neutron fluence rate.
Preferably, also comprise: assessment unit, for carrying out protection assessment according to described atmospheric neutron fluence rate to described target device.
Preferably, described computing unit is also for calculating the ratio of neutron fluence rate when described atmospheric neutron fluence rate and neutron energy scope are 1-10MeV, and described system also comprises: record cell, for recording and storing described ratio.
Pass through technique scheme, the neutron energy threshold value of described target device generation single particle effect can be caused accordingly according to the process of different target devices, thus can carry out according to energy threshold the atmospheric neutron fluence rate that integration obtains corresponding to target device, and then neutron single-particle incident rate can be calculated according to atmospheric neutron fluence rate, assessed exactly by the protection index of single event rate to the atmospheric neutron of target device.
Accompanying drawing explanation
Can understanding the features and advantages of the present invention clearly by reference to accompanying drawing, accompanying drawing is schematic and should not be construed as and carry out any restriction to the present invention, in the accompanying drawings:
Fig. 1 shows the schematic flow diagram of avionic device atmospheric neutron fluence rate computing method according to an embodiment of the invention;
Fig. 2 shows the schematic block diagram of avionic device atmospheric neutron fluence rate computing system according to an embodiment of the invention.
Embodiment
Can more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.
The present invention proposes a kind of avionic device atmospheric neutron fluence rate computing method, comprising: the process detecting target device, obtain the neutron energy threshold value causing target device generation single particle effect; Utilize atmospheric neutron fluence rate distribution situation, calculate from energy threshold to the atmospheric neutron fluence rate in just infinite energy range.
Because the process of different target devices is different, corresponding energy threshold is also different.Concrete process and the corresponding relation of energy threshold can be as shown in table 1,
| Process (μm) | 0.4 | 0.25 | 0.18 | 0.16 | 0.13 | 0.09 |
| Threshold energy (MeV) | 10 | 5 | 3 | 2 | 2 | 0.5 |
Table 1
The process of such as target device is 0,25 μm, corresponding energy threshold is 5MeV, if so assessed its protection index according to the atmospheric neutron fluence rate in 1-10MeV or 1MeV of the prior art to just infinite energy range, obvious scope is wide, and assessment result is coarse.And calculate corresponding atmospheric neutron input rate according to concrete energy threshold, then can obtain the concrete corresponding atmospheric neutron fluence rate of target device, thus can assess exactly the protection index of target device according to this, more be conducive to target device in high energy air driving process, to the protection of atmospheric neutron.
Preferably, atmospheric neutron fluence rate distribution situation is represented by following formula: dN/dE=0.346E
-0.922× exp (-0.0152 (lnE)), wherein, N is neutron flux, and E is neutron energy, and the application conditions of this formula is north latitude 45 °, 12160m height.It should be noted that, although this formula exists above-mentioned applicable elements, in fact the distribution shape of the atmospheric neutron fluence rate of each height is all identical with above-mentioned applicable elements point, so the ratio finally obtained is corresponding other is highly also extensively be suitable for.
Preferably, take energy threshold as lower limit of integral, for upper limit of integral, integral and calculating is carried out to formula with just infinite, obtain atmospheric neutron fluence rate.
Preferably, also comprise: according to atmospheric neutron fluence rate, protection assessment is carried out to target device.
Preferably, also comprise: the ratio of neutron fluence rate when calculating atmospheric neutron fluence rate and neutron energy scope are 1-10MeV, record and store ratio.Record and the ratio stored can be as shown in table 2,
Table 2
By the atmospheric neutron fluence rate within the scope of record different-energy and corresponding ratio relation, can in computation process in the future, according to the energy threshold of different target equipment, according to the neutron fluence rate of its correspondence of ratio relation fast query, and without the need to carrying out integral and calculating, improve the speed obtaining neutron fluence rate, to continue atmospheric neutron assessment sooner.It should be noted that, table 1 is only an example provided by the invention, and except the energy range that table 1 comprises, the present invention can also record and store other energy range and corresponding neutron fluence rate and ratio relation.
As shown in Figure 1, the invention allows for a kind of avionic device atmospheric neutron fluence rate computing method, comprising: S11, detect the process of target device, obtain the neutron energy threshold value causing target device generation single particle effect; S22, obtains the neutron highest energy causing target device generation atmospheric neutron single particle effect; S33, utilizes atmospheric neutron fluence rate distribution situation, calculates from energy threshold to the atmospheric neutron fluence rate within the scope of highest energy.
Obtain and cause the neutron highest energy of target device when there is atmospheric neutron single particle effect specifically to comprise: according to the responsive area of section of the single particle effect incident rate of target device, target device, target device do not protect total number of bits, calculate the minimum fluence rate of target device; The energy that in sub-power spectrum, inquiry is corresponding with minimum fluence rate is in a standard as highest energy.
The operation relation not protecting the minimum fluence rate flux of total number of bits B and target device of the single particle effect incident rate SEErate of target device, the responsive sectional area σ of target device, target device is SEErate=flux × σ × B.
The single particle effect incident rate of target device is not protected total number of bits divided by the responsive sectional area of target device and target device, the minimum fluence rate of target device can be obtained, and in a standard in sub-power spectrum, the minimum fluence rate of target device with cause the neutron highest energy of target device when there is atmospheric neutron single particle effect to be inversely proportional to, sub-power spectrum can inquire the highest energy corresponding with minimum fluence rate in a standard.By being that upper limit of integral carries out calculating and obtains atmospheric neutron fluence rate with highest energy, can ensure to obtain accurate atmospheric neutron fluence rate, to ensure the degree of accuracy of assessment result.
Preferably, atmospheric neutron fluence rate distribution situation is represented by following formula: dN/dE=0.346E
-0.922× exp (-0.0152 (lnE)), wherein, N is neutron flux, and E is neutron energy, and the application conditions of this formula is north latitude 45 °, 12160m height.
Preferably, be lower limit of integral with energy threshold, be that upper limit of integral carries out integral and calculating to formula with highest energy, obtain atmospheric neutron fluence rate.
Preferably, also comprise: according to atmospheric neutron fluence rate, protection assessment is carried out to target device.
Preferably, also comprise: the ratio of neutron fluence rate when calculating atmospheric neutron fluence rate and neutron energy scope are 1-10MeV, record and store ratio.
The invention allows for a kind of avionic device atmospheric neutron fluence rate computing system 20, comprising: detecting unit 21, for detecting the process of target device, obtaining the neutron energy threshold value causing target device generation single particle effect; Computing unit 22, for utilizing atmospheric neutron fluence rate distribution situation, calculates from energy threshold to the atmospheric neutron fluence rate in just infinite energy range.
Atmospheric neutron fluence rate distribution formula is dN/dE=0.346E
-0.922× exp (-0.0152 (lnE)), wherein, N is neutron flux, and E is neutron energy, and the application conditions of this formula is north latitude 45 °, 12160m height.
Preferably, computing unit 22 is lower limit of integral in order to energy threshold, carries out integral and calculating, obtain atmospheric neutron fluence rate with just infinite for upper limit of integral to formula.
Preferably, also comprise: assessment unit 23, for carrying out protection assessment according to atmospheric neutron fluence rate to target device.
Preferably, computing unit 22 is also for calculating the ratio of neutron fluence rate when atmospheric neutron fluence rate and neutron energy scope are 1-10MeV, and system also comprises: record cell 24, for recording and storing ratio.
As shown in Figure 2, the invention allows for a kind of avionic device atmospheric neutron fluence rate computing system 30, comprising: detecting unit 31, for detecting the process of target device, obtaining the neutron energy threshold value causing target device generation single particle effect; Acquiring unit 32, for obtaining the neutron highest energy causing target device generation atmospheric neutron single particle effect; Computing unit 33, for utilizing atmospheric neutron fluence rate distribution situation, calculates from energy threshold to the atmospheric neutron fluence rate within the scope of highest energy.
Preferably, acquiring unit 32 comprises: computation subunit 321, for the responsive area of section of the single particle effect incident rate according to target device, target device, target device do not protect total number of bits, calculate the minimum fluence rate of target device; And inquiry subelement 322, for the energy corresponding with minimum fluence rate of inquiry in sub-power spectrum in a standard as highest energy.
Preferably, atmospheric neutron fluence rate distribution situation is represented by following formula: dN/dE=0.346E
-0.922× exp (-0.0152 (lnE)), wherein, N is neutron flux, and E is neutron energy, and the application conditions of this formula is north latitude 45 °, 12160m height.
Preferably, computing unit 33, for being lower limit of integral with energy threshold, being that upper limit of integral carries out integral and calculating to formula with highest energy, obtaining atmospheric neutron fluence rate.
Preferably, also comprise: assessment unit 34, for carrying out protection assessment according to atmospheric neutron fluence rate to target device.
Preferably, computing unit 33 is also for calculating the ratio of neutron fluence rate when atmospheric neutron fluence rate and neutron energy scope are 1-10MeV, and system also comprises: record cell 35, for recording and storing ratio.
According to the embodiment of the present invention, additionally provide a kind of non-volatile machine readable media, store the program product for calculating and assess atmospheric neutron fluence rate, program product comprises said procedure product.
According to the embodiment of the present invention, additionally provide a kind of machine readable program, program makes machine perform atmospheric neutron fluence rate computing method arbitrary in as above technical scheme.
According to the embodiment of the present invention, additionally provide a kind of storage medium storing machine readable program, wherein, machine readable program makes machine perform atmospheric neutron fluence rate computing method arbitrary in as above technical scheme.
More than be described with reference to the accompanying drawings technical scheme of the present invention, considered in correlation technique, the energy range value calculating neutron fluence rate is crossed as wide in range, and the neutron fluence rate obtained is accurate not, thus is difficult to carry out atmospheric neutron protection assessment exactly.Pass through technique scheme, the neutron energy threshold value of described target device generation single particle effect can be caused accordingly according to the process of different target devices, thus can carry out according to energy threshold the atmospheric neutron fluence rate that integration obtains corresponding to target device, and then neutron single-particle incident rate can be calculated according to atmospheric neutron fluence rate, assessed exactly by the protection index of single event rate to the atmospheric neutron of target device.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. avionic device atmospheric neutron fluence rate computing method, is characterized in that, comprising:
Detect the process of target device, obtain the neutron energy threshold value causing described target device generation single particle effect;
Obtain the neutron highest energy causing described target device generation atmospheric neutron single particle effect;
Utilize atmospheric neutron fluence rate distribution situation, calculate from described energy threshold to the atmospheric neutron fluence rate within the scope of described highest energy.
2. avionic device atmospheric neutron fluence rate computing method according to claim 1, is characterized in that, obtain and cause the neutron highest energy of target device when there is atmospheric neutron single particle effect specifically to comprise:
According to the responsive area of section of the single particle effect incident rate of described target device, described target device, described target device do not protect total number of bits, calculate the minimum fluence rate of described target device;
The energy that in sub-power spectrum, inquiry is corresponding with described minimum fluence rate is in a standard as described highest energy.
3. avionic device atmospheric neutron fluence rate computing method according to claim 1, it is characterized in that, described atmospheric neutron fluence rate distribution situation is represented by following formula:
dN/dE＝0.346E
-0.922×exp(-0.0152(lnE))，
Wherein, N is neutron flux, and E is neutron energy, and the application conditions of this formula is north latitude 45 °, 12160m height.
4. avionic device atmospheric neutron fluence rate computing method according to claim 3, it is characterized in that, with described energy threshold for lower limit of integral, for upper limit of integral, integral and calculating is carried out to described formula with described highest energy, obtain described atmospheric neutron fluence rate.
5. avionic device atmospheric neutron fluence rate computing method according to any one of Claims 1-4, is characterized in that, also comprise:
According to described atmospheric neutron fluence rate, protection assessment is carried out to described target device.
6. avionic device atmospheric neutron fluence rate computing method according to any one of Claims 1-4, is characterized in that, also comprise:
Calculate the ratio of neutron fluence rate when described atmospheric neutron fluence rate and neutron energy scope are 1-10MeV, record and store described ratio.
7. an avionic device atmospheric neutron fluence rate computing system, is characterized in that, comprising:
Detecting unit, for detecting the process of target device, obtains the neutron energy threshold value causing described target device generation single particle effect;
Acquiring unit, for obtaining the neutron highest energy causing described target device generation atmospheric neutron single particle effect;
Computing unit, for utilizing atmospheric neutron fluence rate distribution situation, calculates from described energy threshold to the atmospheric neutron fluence rate within the scope of described highest energy.
8. avionic device atmospheric neutron fluence rate computing system according to claim 7, it is characterized in that, described acquiring unit comprises:
Computation subunit, for the responsive area of section of the single particle effect incident rate according to described target device, described target device, described target device do not protect total number of bits, calculate the minimum fluence rate of described target device; And
Inquiry subelement, for the energy corresponding with described minimum fluence rate of inquiry in sub-power spectrum in a standard as described highest energy.
9. avionic device atmospheric neutron fluence rate computing system according to claim 7, it is characterized in that, described atmospheric neutron fluence rate distribution situation is represented by following formula:
dN/dE＝0.346E
-0.922×exp(-0.0152(lnE))，
Wherein, N is neutron flux, and E is neutron energy, and the application conditions of this formula is north latitude 45 °, 12160m height.
10. avionic device atmospheric neutron fluence rate computing system according to claim 9, it is characterized in that, described computing unit be used for described energy threshold for lower limit of integral, for upper limit of integral, integral and calculating is carried out to described formula with described highest energy, obtains described atmospheric neutron fluence rate.
11. according to any one of claim 7 to 10 avionic device atmospheric neutron fluence rate computing system, it is characterized in that, also comprise:
Assessment unit, for carrying out protection assessment according to described atmospheric neutron fluence rate to described target device.
12. according to any one of claim 7 to 10 avionic device atmospheric neutron fluence rate computing system, it is characterized in that, described computing unit also for calculating the ratio of neutron fluence rate when described atmospheric neutron fluence rate and neutron energy scope are 1-10MeV, and
Described system also comprises:
Record cell, for recording and storing described ratio.
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Cited By (3)
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