CN104898101A - Ionosphere incoherent scatter radar coverage simulation method - Google Patents
Ionosphere incoherent scatter radar coverage simulation method Download PDFInfo
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- CN104898101A CN104898101A CN201510235116.8A CN201510235116A CN104898101A CN 104898101 A CN104898101 A CN 104898101A CN 201510235116 A CN201510235116 A CN 201510235116A CN 104898101 A CN104898101 A CN 104898101A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
Abstract
The invention provides an ionosphere incoherent scatter radar coverage simulation method, comprising the steps of acquiring actual data of a certain moment from official EISCAT (European Incoherent Scatter Scientific Association) and AMISR (Advanced Modular Incoherent Scatter Radar), calculating the signal-to-noise ratio according to a formula, and drawing a graph indicating that the signal-to-noise ratio changes along with the detection distance by using matlab; and then processing data of an IRI (International Reference Ionosphere) at the same moment by utilizing a formula to obtain a signal-to-noise ratio simulation result, and performing corresponding contrastive analysis on the real-time data processing result and the simulation result. According to the method, a signal-to-noise ratio formula can be obtained by deducing a radar equation; the method is suitable for detecting an ionosphere serving as a soft target; and the method can be used for accurately analyzing the coverage of incoherent scatter radar by contrasting.
Description
Technical field
The present invention relates to a kind of emulation design method being applicable to estimate ionosphere incoherent scattering radar detection power.
Background technology
Atmospheric envelope surrounds the environment that we mankind survive, ionosphere is the region of earth atmosphere ionization, its scope extends to about 1000 Km from 80 Km always, there are very many free electrons and ion in this region, enough affect radio velocity of wave propagation, reflect, scattering and refraction, thus can to wireless communication, the space operation of Aero-Space and navigation measurement etc. the mankind can produce important impact, so seem rather important to ionospheric research.
Ionospheric detection mainly contains the altimeter of ground, Returning scattering detects, oblique incidence souding, and the top detection of space-based, the means such as LEO occultation, because the air in ionosphere is very thin, can know according to law of conservation of energy, a little amplitude disturbances of surface air, the disturbance that in ionosphere, amplitude is larger may be caused, observe than being easier to, ionospheric key property is its electron density, electron temperature, ion temperature, the parameter such as drift velocity and ion component, incoherent scattering radar measures Ionospheric Parameters and the most effective equipment of electric field, research ionospheric structure and the most strong instrument of dynamic process, also be the detecting devices uniquely can measuring whole layer height at present, can the monitoring ionosphere of accurately complete section face and multiparameter.
Incoherent scattering radar utilizes the faint scattered signal of electronics and plasma thermal fluctuation in upper atmosphere, and measure the physical parameter of upper atmosphere, the scattered signal caused due to this thermal fluctuation is noncoherent, so be called incoherent scattering radar.The detection of a target of incoherent scattering radar is electronics in ionosphere and ion, temporal resolution and height resolution higher, different time ionospheric plasma auto-correlation spatially and power spectrum can be obtained.Single free electron is called Thomson scattering to electromagnetic scattering, be also referred to as non-coherent scattering, 1958 Gordon (W. E. Gordon) to propose non-coherent scattering first theoretical, the free electron existed in ionosphere can non-coherent addition to the scattering of radiowave, and uses ground high powered radar likely to measure scatter echo.Bauer in the same year this (K. L. Bowles) has recorded ionospheric scatter echo, afterwards incoherent scattering sounding growing up gradually.Incoherent scattering radar has that antenna effective area is large, emissive power is high, system noise is low and the feature such as Special pulse coding techniques.Incoherent scattering radar is the important technical of the phenomenons such as space weather situation being carried out to monitoring and forecast, so be significant to the research of incoherent scattering radar.
The development of microelectric technique and digital technology makes the function of Radar Signal Processing more and more stronger, algorithm also becomes increasingly complex, along with the development of signal processing theory, and the fast development of computer technology, constantly improve storage space and computing power, emerge in large numbers the analogue system being realized total digitalization by computing machine immediately, the signal transacting of incoherent scattering radar also changes software simulating into from simple hardware implementing, the real time data detected is deposited into computing machine by increasing incoherent scattering radar, then high speed processing is carried out with the software of specialty, and realize data sharing by internet, processing signals is made to have more dirigibility, maintenance and update process are also convenience very.
Summary of the invention
The object that the present invention is proposes a kind of emulation mode estimating ionosphere incoherent scattering radar detection power, incoherent scattering sounding refers to the scattering that electric wave causes owing to being subject to the random thermal fluctuation impact of quasi-equilibrium electron density in ionosphere, receive this energy thus get the ionospheric probing method of Ionospheric physics parameter, the signal obtained by incoherent scattering sounding is very faint, in order to obtain enough signal to noise ratio (S/N ratio)s, need to select that there is the long-pending radio-frequency receiving-transmitting equipment in appropriate power aperture, low-noise reception equipment and the complicated information processing technology, they could be extracted from the noise background of detection system, realize the accurate measurement of Ionospheric Parameters, incoherent scattering radar is a costly engineering, in order to be unlikely to cause too high construction and maintenance cost, so need the detection power of more accurate estimation radar, thus determine the detection performance of incoherent scattering radar, this is designed with important meaning for what instruct incoherent scattering radar.
Radar adopts bigbore parabola and phased array antenna, optimization system performance is not only contributed to the emulation of antenna system, construction cost can be reduced to a great extent, for this bigbore antenna, emulate particularly important, by emulation, and continuous optimization Simulation, us can be helped to select most to have the Antenna Design of cost performance.
The target of incoherent scattering sounding is a kind of so special soft object in ionosphere, by carrying out a series of derivation to radar equation, finally obtaining the computing method of signal to noise ratio (S/N ratio), substituting into concrete parameter value, emulate, obtain the simulation result of signal to noise ratio (S/N ratio).
We can know from radar equation, and system signal noise ratio can represent and is:
(1)
Here,
rbe detection range, in distance be
r o time signal to noise ratio (S/N ratio) be 1,
r o can be defined as:
(2)
p av average transmit power,
g t ,
g r for antenna gain,
σ t for the section of target,
l t be loss, in the ISR radar work system of single station, under being operated in vertical incidence and backscattered mode, for the non-coherent scattering power returned from one piece of ionospheric reflection, approximate expression is:
(3)
p t a r represent indicator peak power-aperature product,
n e electron density, assuming that the aperture of transmitter and receiver is identical,
σ 0can be defined as:
(4)
σ e it is electronic radar cross section (10
-28m
2), α=
4 π D/ λ(
ddebye length,
λwavelength),
t e / T i it is electron-ion temperature ratio.Noise power
p n :
(5)
kboltzmann constant,
t n for system noise temperature,
bfor receiver bandwidth.
The same with ordinary radar system, the range resolution of ISR system is determined by the pulse width τ transmitted.
(6)
Instantaneous (monopulse) signal to noise ratio (S/N ratio) of system can be defined as:
(7)
l sys for radar system loss.
In the process analyzing incoherent scattering radar detection power, mainly comprise, by the software process radar raw data of external similar nature of exploitation, and the result after process and software emulation result are contrasted, mainly come at matlab platform.Specifically, we are respectively from International Reference Ionosphere (IRI), European Incoherent Scatter Scientific Association (EISCAT) and Advanced Modular Incoherent Scatter Radar (AMISR) obtains data, obtains echo signal power
p r and noise power
p n , signal to noise ratio snr can directly be tried to achieve:
(8)
Obtain the measured data in a certain moment from official EISCAT and AMISR, according to formula (8), use matlab to draw signal to noise ratio (S/N ratio) along with detection range and change figure.Then utilize formula (7), the data of process IRI model synchronization, obtain signal to noise ratio (S/N ratio) simulation result, the result of real time data processing and our simulation result are carried out corresponding comparative analysis.
IRI is the standard empirical model obtained according to the ionospheric data detected in a large number; EISCAT is the incoherent scattering radar of a kind of multistation form set up in Europe, is applicable to the measurement of Ionospheric Movement, is used herein the measurement data of EISCAT Svalbard Radar (ESR), and this radar adopts parabola antenna; AMISR is the modularized equipment of a kind of advanced person, is used herein the data that Poker Flat AMISR (PFISR) provides, and this radar adopts the antenna of phased array.
The present invention is to the emulation of ionosphere incoherent scattering radar detection power, mainly through the derivation to radar equation, obtain signal to noise ratio (S/N ratio) formula, be applicable to this soft object of ionization detection layer, recycling software emulation realizes, make operation more flexible, optimize more convenient, modular emulation, there is very strong transplantability, through contrast, the method can analyze the detection power of incoherent scattering radar accurately.
Accompanying drawing explanation
Fig. 1 is: the process flow diagram of estimation incoherent scattering radar detection power;
Fig. 2 is: on January 22nd, 2004 4:00 simulation result and EISCAT measured data signal to noise ratio (S/N ratio) contrast;
Fig. 3 is: on January 22nd, 2004 5:00 simulation result and EISCAT measured data signal to noise ratio (S/N ratio) contrast;
Fig. 4 is: on January 22nd, 2004 8:00 simulation result and EISCAT measured data signal to noise ratio (S/N ratio) contrast;
Fig. 5 is: on September 11st, 2011 4:00 simulation result and AMISR 64 panels measured data signal to noise ratio (S/N ratio) contrast;
Fig. 6 is: on September 11st, 2011 4:00 simulation result and AMISR 128 panels measured data signal to noise ratio (S/N ratio) contrast.
Embodiment
First understand the principle of incoherent scattering radar ionization detection layer in depth, derive according to radar equation the equation that the applicable detection of a target is a kind of like this soft object in ionosphere, obtain the formula (7) calculating signal to noise ratio (S/N ratio).As the process flow diagram that Fig. 1 is estimation incoherent scattering radar detection power, we obtain the measured data of January in 2004 4:00,5:00 and 8:00 on the 22nd from EISCAT official, obtain echo power and noise power, the signal to noise ratio (S/N ratio) of measured data is drawn out by formula (8), on IRI empirical model, obtain data corresponding to same place, same time simultaneously, concrete parameter value is substituted into formula (7), obtains the simulation result in corresponding moment, both are contrasted, as Fig. 2, Fig. 3, Fig. 4.As can be seen from the figure come, both results are identical.
Our measured data of obtaining 4:00 on the 11st September in 2011 from AMISR official afterwards, comprise and be configured to 64 panels and 128panels, during 64 panels, peak transmitted power is 0.9 MW, and antenna array aperture is 360 m
2; During 128 panels, peak transmitted power is 1.8 MW, and antenna array aperture is 720 m
2, obtain echo power and noise power, drawn out the result of measured data by formula (8).On IRI empirical model, obtain same place, data corresponding to the same time simultaneously.Concrete parameter value is substituted into formula (7), draws the simulation result of signal to noise ratio (S/N ratio), both are contrasted, as Fig. 5, Fig. 6, can find that, when 64 panels, signal to noise ratio (S/N ratio), when lower than 500 Km, is very smoothly coincide; During 128 panels, signal to noise ratio (S/N ratio), when lower than 700 Km, has good match result.
Through contrast, illustrate that we are reliably feasible for the emulation mode of incoherent scattering radar detection power, this has very important directive significance to other radar system design.
Claims (1)
1. ionosphere incoherent scattering radar detection combat power field method, is characterized in that, first official EISCAT and AMISR place obtain the measured data in a certain moment, according to formula
, in formula
p r --echo signal power, noise power
p n --noise power,
Calculate signal to noise ratio (S/N ratio), use matlab to draw signal to noise ratio (S/N ratio) along with detection range and change figure;
Then formula is utilized
,
In formula
p t a r represent indicator peak power-aperature product, range resolution
dR,
n e electron density,
rdetection range,
kboltzmann constant,
t n for system noise temperature,
bfor receiver bandwidth,
l sys for radar system loss,
,
σ e it is electronic radar cross section (10
-28m
2), α=
4 π D/ λ(
ddebye length,
λwavelength),
t e / T i be electron-ion temperature ratio, the data of process IRI model synchronization, obtain signal to noise ratio (S/N ratio) simulation result, the result of real time data processing and our simulation result are carried out corresponding comparative analysis.
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Cited By (7)
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|---|---|---|---|---|
| CN105242274A (en) * | 2015-10-26 | 2016-01-13 | 南昌大学 | Ionosphere non-coherent scatter radar differential phase detection method |
| CN106610488A (en) * | 2015-10-23 | 2017-05-03 | 中国飞行试验研究院 | Radar detection power measurement method |
| CN107255802A (en) * | 2017-07-21 | 2017-10-17 | 西安电子科技大学 | Method based on the peak structure inverting strong disturbance ionosphere parameter of ion line spectrum three |
| CN107290745A (en) * | 2017-05-26 | 2017-10-24 | 南昌大学 | A kind of ionospheric probing method and system |
| CN111580061A (en) * | 2020-05-20 | 2020-08-25 | 中国科学院地质与地球物理研究所 | Ionized layer electron density inversion method based on CLEAN algorithm |
| CN111610513A (en) * | 2020-06-04 | 2020-09-01 | 中国科学院地质与地球物理研究所 | Method, system and device for extracting multi-station incoherent scattering radar signal |
| CN116224260A (en) * | 2023-05-06 | 2023-06-06 | 成都众享天地网络科技有限公司 | Radar three-dimensional power range calculation method based on interference |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106610488A (en) * | 2015-10-23 | 2017-05-03 | 中国飞行试验研究院 | Radar detection power measurement method |
| CN105242274A (en) * | 2015-10-26 | 2016-01-13 | 南昌大学 | Ionosphere non-coherent scatter radar differential phase detection method |
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| CN107290745A (en) * | 2017-05-26 | 2017-10-24 | 南昌大学 | A kind of ionospheric probing method and system |
| CN107255802A (en) * | 2017-07-21 | 2017-10-17 | 西安电子科技大学 | Method based on the peak structure inverting strong disturbance ionosphere parameter of ion line spectrum three |
| CN111580061A (en) * | 2020-05-20 | 2020-08-25 | 中国科学院地质与地球物理研究所 | Ionized layer electron density inversion method based on CLEAN algorithm |
| CN111580061B (en) * | 2020-05-20 | 2020-10-27 | 中国科学院地质与地球物理研究所 | Ionized layer electron density inversion method based on CLEAN algorithm |
| CN111610513A (en) * | 2020-06-04 | 2020-09-01 | 中国科学院地质与地球物理研究所 | Method, system and device for extracting multi-station incoherent scattering radar signal |
| CN116224260A (en) * | 2023-05-06 | 2023-06-06 | 成都众享天地网络科技有限公司 | Radar three-dimensional power range calculation method based on interference |
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