CN106134461B - A kind of spaceborne ionosphere Amplitude scintillation monitoring device - Google Patents

Abstract

The present invention relates to a kind of spaceborne ionosphere Amplitude scintillation monitoring device, this device adopts a kind of double-frequency GPS satellite navigation receiver that carries on low orbit satellite, utilize GPS receiver to carry out satellite precise orbit determination and ionospheric scintillation monitoring, the navigation signal that gps satellite navigation neceiver is received carries out data processing, obtain ionosphere Amplitude scintillation detected parameters, obtain ionosphere distribution situation, improve ionospheric scintillation and disturbance detection level, this device can make full use of gps satellite navigation signal and have Global coverage ability and continuous continuous feature, improve the ability of atmospheric ionized layer monitored data processing, this device can also utilize the fast advantage of low orbit satellite flying speed, reach the short object of Global Ionospheric detection time, atmospheric ionized layer Amplitude scintillation monitoring real-time and global coverage are improved.

Description

A kind of spaceborne ionosphere Amplitude scintillation monitoring device

Technical field

The invention belongs to satellite navigation and space weather forecast technical field, particularly relate to a kind of spaceborne ionizationLayer Amplitude scintillation monitoring device.

Background technology

Ionosphere is a part of atmosphere apart from 60 kilometers to several thousand kilometers of earth surfaces, due to sun electromagnetismThe impact of radiation and high energy particle, this part atmosphere is ionized formation plasmoid, and this atmosphere is to logicalCross the radio signal of wherein propagating and will produce the effects such as refraction, scattering, absorption, flicker and Faraday rotation,Speed, direction, phase place, amplitude and the polarization state etc. of transmitting signal are changed, and, due toThe inhomogeneities of ionospheric structure and random time variation, also can cause amplitude, phase place, the arrival of transmitting signalShort-period irregular variation such as angle, polarized state. Above-mentioned all changes are referred to as " ionospheric scintillation ", whenWhile there is ionospheric scintillation, change in signal strength is very violent, will cause signal transmission unstable, is called as " electricityAbsciss layer Amplitude scintillation ". Along with the technology such as radio communication, navigator fix, satellite remote sensing, radio and television are oozed graduallyTo social each field, the impact that bring in ionosphere is also increasing thoroughly. Once there is the flicker of forceful electric power absciss layer, allVarious communication networks, financial transaction, bank settlement, satellite television and the internet of ionospheric propagation are passed throughBe affected Deng all, the loss causing is very large. In addition, along with the development of China's survey of deep space technology, to enteringThe needs that row ionospheric scintillation is followed the tracks of are more urgent.

Classical method mainly relies on the satellite of design specific use, is transmitted into space and carries out signal detection laterComplete, exist expense high, the cycle is long, the covering completely of the monitored area that is difficult to meet the demands. Chinese patentPublication number CN 200969586, open day is on January 31st, 2007, name is called " a kind of ionospheric scintillationMonitoring device with electromagnetic interference ", and China Patent Publication No. CN 101098183, open day is 2008In on January 2, in, name is called " system of a kind of monitoring ionosphere scintillation and interference ", all discloses to adopt to receiveAntenna, amplifier and frequency spectrograph carry out the method for ionosphere monitoring, and the method is to utilize opposing connection Earth's orbit to defendThe reception of star signal, or the ionosphere that finishes receiving of geostationary orbit satellite signal is monitored. Chinese patentPublication number CN 101806911A, open day is on August 18th, 2010, name is called " a kind of ionosphere sudden strain of a muscleBright monitoring method and ionospheric scintillation monitor ", this patent discloses and has adopted the continuous of GMS transmittingSignal is as beacon, antenna reception satellite-signal, and to signal amplitude and phase information collection, then completeIonosphere monitoring task. Said method all has the satellite that will rely on specific use, exists monitoring time long,Be difficult to meet the covering completely of monitored area, more can not meet Global coverage monitoring capability, and, be difficult to fullFoot the quick obtaining global atmosphere of wartime, the needs of ionosphere information (wartime requirement 2～3 hours withInterior data), thus the needs that provide relevant atmospheric parameter to bind in real time for precision strike weapon can not be provided.

Summary of the invention

The object of the invention is to overcome the above-mentioned deficiency of prior art, provide a kind of spaceborne ionosphere amplitude to dodgeBright monitoring device, this device make full use of gps satellite navigation signal have Global coverage ability and continuously not betweenDisconnected property feature, improves the ability of atmospheric ionized layer monitored data processing, can also utilize low orbit satellite flight speedSpend fast advantage, reached the short object of Global Ionospheric detection time, improved atmospheric ionized layer amplitudeFlicker monitoring real-time and global coverage.

Above-mentioned purpose of the present invention is achieved by following technical solution:

A kind of spaceborne ionosphere Amplitude scintillation monitoring device, comprise navigator fix channel, ionosphere supervisory channel,Navigation positioning data processor, ionosphere monitored data processor and highly stable crystal oscillator, wherein:

Navigator fix channel: receive GPS radiofrequency signal from location reception antenna, and carry out low to signal successivelyNoise amplification, down-converted, intermediate frequency amplify and mould/number conversion, and described data signal are exported to navigationLocator data processor; Receive the AGC control signal of navigation positioning data processor output simultaneously, and carry outAGC signal filtering, filtered signal is controlled the intermediate frequency gain amplifier in navigator fix channel; ThisThe standard clock signal that outer reception highly stable crystal oscillator provides, produces the local carrier for down-convertedSignal;

Navigation positioning data processor: the data signal of reception navigator fix channel output is carried out pseudo-code carrier wave and followedTrack processing, obtains pseudorange, the original observed quantity of pseudorange rates, obtains the power detection signal that AGC controls simultaneously,Utilize described original observed quantity to carry out navigator fix and resolve, and calculation result is stored, by described powerMonitor signal is exported to navigator fix channel;

Ionosphere supervisory channel: receive GPS radiofrequency signal from ionosphere monitoring reception antenna, and successively to letterNumber carry out low noise amplification, down-converted, intermediate frequency and amplify and mould/number conversion, and by defeated described data signalGo out to ionosphere monitored data processor; The AGC that simultaneously receives ionosphere monitored data processor output controlsSignal, controls the intermediate frequency gain amplifier in the supervisory channel of ionosphere; In addition receive highly stable crystal vibrationThe standard clock signal that device provides, produces the local carrier signal for down-converted;

Highly stable crystal oscillator: produce standard clock signal, export to respectively navigator fix channel, ionosphereThe second pseudo-code carrier wave in supervisory channel, navigation positioning data processor and ionosphere monitored data processor is followedTrack ring;

Ionosphere monitored data processor: comprise digital down converter, correlation calculator, width item calculator,Subtracter, low pass filter, scintillation index calculator, flicker decision device, AGC setting apparatus, the second pseudo-codeCarrier tracking loop and the second data storage, wherein:

Digital down converter: the data signal that receives ionosphere supervisory channel output is carried out Digital Down Convert,To I, Q two-way baseband complex signal, and export to correlation calculator;

Correlation calculator: receive I, the Q two-way baseband complex signal of digital down converter output, with the second pseudo-codeLocal pseudo-code, the carrier signal of carrier tracking loop output are carried out related operation, obtain two-way ionospheric scintillation prisonSurvey primary signal I_C，Q_C, and by two-way primary signal I_C，Q_CExport to respectively width item calculator, the second pseudo-codeCarrier tracking loop and AGC setting apparatus;

Width item calculator: the two-way primary signal I that receives correlation calculator output_C，Q_C, carry out data transformationProcess, obtain arrowband item power NBP and broadband item power WBP, and export to subtracter:

$WBP=\underset{i=1}{\overset{n}{\Σ}}(I_{Ci}^2+Q_{Ci}^2);$

$NBP=\left(\underset{i=1}{\overset{n}{\Σ}}{I}_{Ci}^2\right)+\left(\underset{i=1}{\overset{n}{\Σ}}{Q}_{Ci}^2\right);$

Wherein n is positive integer;

Subtracter: receive arrowband item power NBP and the broadband item power WBP of the output of width item calculator, profitDeduct broadband item power WBP with arrowband item power NBP, obtain Amplitude scintillation detection dataSI=NBP-WBP, and export to low pass filter;

Low pass filter: the Amplitude scintillation that receives subtracter output detects uses data SI, carries out LPF placeReason, the high-frequency noise in filtering data SI, obtains pure monitored data, and the scintillation index of output is calculatedDevice;

Scintillation index calculator: receive the monitored data of low pass filter output, carry out ionospheric amplitude sudden strain of a muscleBright index calculates, and obtains ionospheric amplitude scintillation index S₄, and export to flicker decision device;

$S_4=\sqrt{\frac{<{\mathrm{SI}}^2>-<SI{>}^2}{<SI{>}^2}};$

Wherein: "<>" represent data to be averaged;

Flicker decision device: the ionospheric amplitude scintillation index S that receives the output of scintillation index calculator₄, simultaneouslyThe navigator fix calculation result that receives the output of navigation positioning data processor, judges Shuo Dian position, ionosphere and sudden strain of a muscleBright intensity, and judged result data are exported to the second data storage;

The second data storage: the judged result data that receive the output of flicker decision device are exported to number on outside starBiography system;

The second pseudo-code carrier tracking loop: the two-way primary signal I that receives correlation operator output_C，Q_C, simultaneouslyReceive the standard clock signal of highly stable crystal oscillator output, carry out pseudo-code, the tracking of carrier wave closed loop, and outputLocal pseudo-code carrier wave is to correlation calculator;

AGC setting apparatus: the two-way primary signal I that receives correlation operator output_C，Q_C, calculate signal power,Obtain AGC control signal, and export to ionosphere supervisory channel.

In the Amplitude scintillation monitoring device of above-mentioned spaceborne ionosphere, navigator fix channel comprises that the first low noise putsLarge device, the first frequency mixer, the first intermediate frequency amplifier, an A/D, first frequency synthesizer, an AGCController and AGC wave filter, wherein the first low-noise amplifier receives GPS radio frequency from location reception antennaSignal, carries out low noise amplification to signal, and the signal after low noise amplification is exported to the first frequency mixer and carry outDown-converted; The signal that the first intermediate frequency amplifier receives after described down-converted carries out intermediate frequency amplification, andSignal after intermediate frequency is amplified is exported to an A/D and is carried out mould/number conversion, obtains data signal and exports to navigationLocator data processor; AGC wave filter receives the AGC control signal of navigation positioning data processor output,Carry out AGC signal filtering, filtered signal is exported to an AGC controller, to navigator fix channelIn intermediate frequency gain amplifier control; First frequency synthesizer receives the clock that highly stable crystal oscillator providesSignal, produces the local carrier signal for down-converted, exports to the first frequency mixer.

In the Amplitude scintillation monitoring device of above-mentioned spaceborne ionosphere, navigation positioning data processor comprises the first puppetCode carrier tracking loop, navigator fix solver, power detector, data register and the first data storage,Wherein the data signal of the first pseudo-code carrier tracking loop reception navigator fix channel output is carried out pseudo-code carrier trackProcess, obtain the power detection primary signal that pseudorange, the original observed quantity of pseudorange rates and AGC control, by pseudorange,Navigator fix solver is exported in the original observed quantity of pseudorange rates, and the power detection primary signal that AGC is controlled is defeatedGo out to power detector; Navigator fix solver utilizes described original observed quantity to carry out navigator fix and resolves, andStore calculation result into data register; Power detector received power detects primary signal and obtains AGC controlThe power detection signal of system, exports to navigator fix channel by described power detection signal; The first data storageCalculation result in device receive data register is stored.

In the Amplitude scintillation monitoring device of above-mentioned spaceborne ionosphere, ionosphere supervisory channel comprises the second low noiseAmplifier, the second frequency mixer, the second intermediate frequency amplifier, the 2nd A/D, second frequency synthesizer and the 2nd AGCController, wherein the second low-noise amplifier receives GPS radiofrequency signal from determining ionosphere monitoring reception antenna,Signal is carried out to low noise amplification, and the signal after low noise amplification is exported to the second frequency mixer and carry out down coversionProcess; The signal that the second intermediate frequency amplifier receives after described down-converted carries out intermediate frequency amplification, and by intermediate frequencySignal after amplification is exported to the 2nd A/D and is carried out mould/number conversion, obtains data signal and exports to ionosphere monitoringData processor; The AGC that the 2nd AGC controller receives ionosphere monitored data processor output controls letterNumber, the second intermediate frequency amplifier in the supervisory channel of ionosphere is controlled; Second frequency synthesizer receives highThe clock signal that stable crystal oscillator provides, produces the local carrier signal for down-converted, exports toThe second frequency mixer.

In the Amplitude scintillation monitoring device of above-mentioned spaceborne ionosphere, the filtering in the monitored data processor of ionosphereDevice is in series by the quadravalence Butterworth type low pass filter of three standards.

In the Amplitude scintillation monitoring device of above-mentioned spaceborne ionosphere, ionosphere monitoring reception antenna comprises forward direction spyObservation line, backward detection reception and navigator fix antenna, forward detection antenna reception forward direction ionospheric scintillation letterNumber, backward exploring antenna receives backward ionospheric scintillation signal, navigator fix antenna reception GPS navigation locationSignal.

The present invention compared with prior art beneficial effect is:

(1) monitoring device of the present invention adopts low orbit satellite lift-launch gps satellite navigation signal receiving system to carry outIonospheric scintillation monitoring, has improved ionosphere Amplitude scintillation monitoring Global covering power, has accelerated ionosphere widthDegree flicker monitoring velocity;

(2) monitoring device of the present invention utilizes gps satellite orbit determination and signal amplitude flicker binary channels monitoring means,Can determine in real time low orbit satellite position, determine position, ionospheric scintillation monitoring point;

(3) monitoring device of the present invention adopts real-time calculating Amplitude scintillation on star, and directly by monitoring result storageAnd transmission, reduce the volume of transmitted data of satellite data transmission telemetry system, improve several transfer efficiencies;

(4) the AGC loop in the ionosphere supervisory channel of monitoring device of the present invention adopts open loop operation strategy,Reduce the impact of AGC loop on the monitoring of ionosphere Amplitude scintillation, improved monitoring sensitivity;

(5) monitoring device of the present invention adopts forward and backward bi-directional probing to pass through ionospheric GPS satellite navigation signalsReceiving antenna device, can be in flight, processes the multiple ionosphere of passing through a little of forward and backward simultaneously and dodgesBright situation, has improved ionosphere monitoring coverage.

Brief description of the drawings

Fig. 1 is ionospheric scintillation monitoring device functional block diagram of the present invention;

Fig. 2 is that the present invention receives ionospheric refraction gps signal schematic diagram;

Fig. 3 is ionosphere of the present invention monitoring device antenna installation diagram;

Fig. 4 is ionosphere of the present invention Amplitude scintillation monitoring device structured flowchart.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:

Be illustrated in figure 1 ionospheric scintillation monitoring device functional block diagram of the present invention, comprise and defending as seen from the figureReception antenna is monitored in star orbit determination reception antenna, orbit determination low-noise amplifier, forward direction ionospheric scintillation, forward direction is lowNoise amplifier, backward ionospheric scintillation monitoring reception antenna, backward low-noise amplifier and GPS receiverSeveral functional modules, receive radio frequency gps signal from reception antenna, after low-noise amplifier, are sentCarry out Satellite Orbit Determination and the processing of ionospheric scintillation monitored data to receiver inside, orbit determination data and ionosphere are dodgedBright monitoring result is stored in receiver inside, then transfers to ground by telemetry system on star, and obtaining needsThe parameter of wanting and Satellite Orbit Determination result. Receiver power supply adopts 28V dc source on star to be responsible for. Adopt GPSReceiver carries out Satellite Orbit Determination and has two objects, and one is to improve Satellite Orbit Determination precision, and another isOrbit determination result is applied to ionospheric scintillation monitoring parameter and calculates, obtain the pass between known point and gps satelliteBe to complete the location parameter of atmospheric sounding. Adopt two reception antennas, carry out forward direction and backward detection, canTo increase investigative range, labor is as follows:

Be illustrated in figure 2 the present invention and receive ionospheric refraction gps signal schematic diagram, Fig. 2 has provided low rail and has defendedGeometry site between star and gps satellite, gps satellite is positioned at apart from about 20600 public affairs of ground levelIn middle high orbit, the height distance ground of low orbit satellite is approximately 790 kilometers, atmospheric thickness is aboutFor apart near 1000 kilometers, ground, gps satellite signal is during through atmospheric propagation, be subject to atmospheric refraction withThe impact of scattering, signal propagation direction deflects, can be received by the low orbit satellite of non line of sight scope,Because signal has passed through quite a few atmospheric propagation path, atmosphere its effect is just reacted to letterAmong number characteristic, situation about representing in figure is backward GPS decline star signal propagation condition, same, at low railThe front of satellite transit track, exists the refraction of forward direction GPS rising star signal and beyond-the-horizon communication situation. ThereforeOn ionospheric scintillation monitoring GPS receiver, two antennas are installed, have been responsible for respectively receiving forward direction and backward biographyBroadcast signal task. According to atmospheric refraction and scattering situation, the angle of antenna installation site and satellite axis is 20.7Degree.

Be illustrated in figure 3 ionosphere of the present invention monitoring device antenna installation diagram, navigation neceiver is installed in to be defendedStar enclosure interior, mainly completes navigator fix and data processing task, and responsible data communication and device controlWork processed, connects telemetry system by data communication interface, completes data by the dsp processor in main frameProcess and task management and running, reception antenna comprises that forward detection antenna, backward detection receive and navigationPositioning antenna, forward detection antenna reception forward direction ionospheric scintillation signal, backward exploring antenna receives backward electricityAbsciss layer flash signal, navigator fix antenna reception GPS navigation framing signal.

Be illustrated in figure 4 ionosphere of the present invention Amplitude scintillation monitoring device structured flowchart, this device as seen from the figureComprise navigator fix channel, ionosphere supervisory channel, navigation positioning data processor, ionosphere monitored dataProcessor and highly stable crystal oscillator.

Monitoring device comprises satellite fix passage and two complete channels of ionospheric scintillation monitoring, and orbit determination passage connectsReceive many gps satellite signals (at least 4), the orbit determination that completes low orbit satellite track is calculated, forecast forward directionWith the backward visible gps satellite signal through atmospheric refraction and scattering, and give atmospheric ionized layer Amplitude scintillationMonitoring provides original orbit determination data. Ionospheric scintillation monitoring channel mainly completes forward and backward through atmospheric refractionThe gps signal of propagating receives, and surveys forward and backward two-way primary monitoring is provided for atmospheric ionized layer Amplitude scintillationData. The initial data of two passages, after A/D gathers, is input to data handling system.

It is significantly different that satellite fix passage and the AGC control method in ionospheric scintillation monitoring channel have,AGC in satellite fix passage controls and adopts the mode of closed feedback loop to complete, and adopts closed-loop feedback mannerCan ensure the stable of received signal power, reduce because atmospheric scattering, refraction and ionospheric scintillation lamp causeSignal amplitude flicker effects, the design bandwidth of loop has designed by loop filter. Ionospheric scintillationAGC loop in monitoring channel is completely different, must adopt open loop mode of operation, establishes by I/Q dataDetermine, after AGC parameter, to be fully operational in autonomous open loop mode, reduced because the control of AGC loop is to ionizationThe impact of layer flicker, the sensitivity that improves monitoring Amplitude scintillation, in design, in passage, amplifier gain scope is fullThe requirement of foot Amplitude scintillation scope, overall gain scope 60dB, the headroom of be designed to ± 30dB of gain.

Navigator fix channel comprises the first low-noise amplifier, the first frequency mixer, the first intermediate frequency amplifier,One A/D, first frequency synthesizer, an AGC controller and AGC wave filter, wherein the first low noiseAmplifier receives GPS radiofrequency signal from location reception antenna, and signal is carried out to low noise amplification, and by low noiseSignal after amplification is exported to the first frequency mixer and is carried out down-converted, under the first intermediate frequency amplifier reception is describedSignal after frequency-conversion processing carries out intermediate frequency amplification, and the signal after intermediate frequency amplification is exported to an A/D and carry outMould/number conversion, obtains data signal and exports to navigation positioning data processor, and it is fixed that AGC wave filter receives navigationThe AGC control signal of bit data processor output, carries out AGC signal filtering, filtered signal outputGive an AGC controller, the intermediate frequency gain amplifier in navigator fix channel is controlled, first frequency is combinedClose device and receive the clock signal that highly stable crystal oscillator provides, produce the local carrier letter for down-convertedNumber, export to the first frequency mixer.

Navigation positioning data processor comprises the first pseudo-code carrier tracking loop, navigator fix solver, power inspectionSurvey device, data register and the first data storage, wherein the first pseudo-code carrier tracking loop receives navigator fixThe data signal of channel output is carried out the processing of pseudo-code carrier track, obtain pseudorange, the original observed quantity of pseudorange rates andThe power detection primary signal that AGC controls, exports to navigator fix solution by pseudorange, the original observed quantity of pseudorange ratesCalculate device, the power detection primary signal that AGC is controlled is exported to power detector; Navigator fix solver profitCarry out navigator fix with described original observed quantity and resolve, and store calculation result into data register; PowerDetector received power detects primary signal and obtains the power detection signal that AGC controls, by power detection signalExport to navigator fix channel; Calculation result in the first data storage receive data register is stored.

Ionosphere supervisory channel comprise the second low-noise amplifier, the second frequency mixer, the second intermediate frequency amplifier,The 2nd A/D, second frequency synthesizer and the 2nd AGC controller, wherein the second low-noise amplifier is from determining electricityDelamination monitoring reception antenna receives GPS radiofrequency signal, signal is carried out to low noise amplification, and low noise is amplifiedAfter signal export to the second frequency mixer and carry out down-converted; The second intermediate frequency amplifier receives described down coversionSignal after treatment carries out intermediate frequency amplification, and by intermediate frequency amplify after signal export to the 2nd A/D carry out mould/Number conversion, obtains data signal and exports to ionosphere monitored data processor; The 2nd AGC controller receives electricityThe AGC control signal of delamination monitoring data processor output, puts the second intermediate frequency in the supervisory channel of ionosphereLarge device is controlled; Second frequency synthesizer receives the clock signal that highly stable crystal oscillator provides, and produces and usesIn the local carrier signal of down-converted, export to the second frequency mixer. Highly stable crystal oscillator: produce markAccurate clock signal, exports to respectively navigator fix channel, ionosphere supervisory channel, navigation positioning data processingThe second pseudo-code carrier tracking loop in device and ionosphere monitored data processor;

Ionosphere monitored data processor comprise digital down converter, correlation calculator, width item calculator,Subtracter, low pass filter, scintillation index calculator, flicker decision device, AGC setting apparatus, the second pseudo-codeCarrier tracking loop and the second data storage.

Digital down converter receives the data signal of ionosphere supervisory channel output and carries out Digital Down Convert, obtainsI, Q two-way baseband complex signal, and export to correlation calculator.

Correlation calculator receives I, the Q two-way baseband complex signal of digital down converter output, follows with pseudo-code carrier waveLocal pseudo-code, the carrier signal of the output of track ring are carried out related operation, obtain two-way ionospheric scintillation monitoring originalSignal I_C、Q_C, and by two-way primary signal I_C、Q_CExport to respectively width item calculator, pseudo-code carrier wave is followedTrack ring and AGC setting apparatus.

Width item calculator receives the two-way primary signal I of correlation calculator output_C、Q_C, carry out data transformationProcess, obtain arrowband item power NBP and broadband item power WBP, and export to subtracter.

$WBP=\underset{i=1}{\overset{n}{\&Sigma;}}(I_{Ci}^2+Q_{Ci}^2)$

$NBP=\left(\underset{i=1}{\overset{n}{\&Sigma;}}{I}_{C1}^2\right)+\left(\underset{i=1}{\overset{n}{\&Sigma;}}{Q}_{Ci}^2\right);---\left(1\right)$

Subtracter receives arrowband item power NBP and the broadband item power WBP of width item calculator output, utilizesArrowband item power NBP deducts broadband item power WBP, obtains Amplitude scintillation detection and uses data SI, and export toLow pass filter;

SI＝NBP-WBP； (2)

Low pass filter receives the Amplitude scintillation detection of subtracter output and uses data SI, carries out low-pass filtering treatment,High-frequency noise in filtering data SI, obtains pure monitored data, and the scintillation index calculator of output.This wave filter is to be in series by the Butterworth type low pass filter of three standards, wherein f_nIt is wave filterCorner frequency, this frequency that the present invention chooses is 0.1Hz;

$|G_a\left(f\right){|}^2=\frac{{f_n}^{12}}{f^{12}+{f_n}^{12}}---\left(3\right)$

Scintillation index calculator receives the monitored data of low pass filter output, carries out ionospheric amplitude scintillationIndex calculates, and obtains ionospheric amplitude scintillation index S₄, and export to flicker decision device.

$S_4=\sqrt{\frac{<{\mathrm{SI}}^2>-<SI{>}^2}{<SI{>}^2}};---\left(4\right)$

Wherein: "<>" represent data to be averaged;

Flicker decision device receives the ionospheric amplitude scintillation index S of scintillation index calculator output₄, connect simultaneouslyThe navigator fix calculation result of receiving the output of navigation positioning data processor, judges Shuo Dian position, ionosphere and flickerIntensity, and judged result data are exported to the second data storage, flicker decision device judges that ionosphere sparkles pointPosition, the line by the definite low orbit satellite position of navigation positioning data processor and gps satellite position withIonospheric intersection point is put position as ionospheric scintillation.

The second data storage receives the judged result data of flicker decision device output and exports to number biography on outside starSystem.

The second pseudo-code carrier tracking loop receives the two-way primary signal I of correlation operator output_C、Q_C, connect simultaneouslyReceive the standard clock signal of highly stable crystal oscillator output, carry out pseudo-code, the tracking of carrier wave closed loop, and output originallyGround pseudo-code carrier wave is to correlation calculator.

AGC setting apparatus receives the two-way primary signal I of correlation operator output_C、Q_C, calculate signal power,Obtain AGC control signal, and export to ionosphere supervisory channel.

After ionosphere Amplitude scintillation result calculates, first store on star and store by data processor on starDevice inside, when domestic airspace is arrived in satellite transit by the time, is passing monitoring result by processor and data-interfaceDeliver to transfer of data and telemetry system on star, send back ground by telemetry system.

The above, be only the detailed description of the invention of the best of the present invention, but not office of protection scope of the present inventionBe limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in, can be easilyThe variation of expecting or replacement, within all should being encompassed in protection scope of the present invention.

The content not being described in detail in description of the present invention belongs to professional and technical personnel in the field's known skillArt.

Claims (6)

1. a spaceborne ionosphere Amplitude scintillation monitoring device, is characterized in that: comprise navigator fix channel,Ionosphere supervisory channel, navigation positioning data processor, ionosphere monitored data processor and highly stable crystal shakeSwing device, wherein:

Navigator fix channel: receive GPS radiofrequency signal from location reception antenna, and carry out low to signal successivelyNoise amplification, down-converted, intermediate frequency amplify and mould/number conversion, and data signal are exported to navigator fixData processor; Receive the AGC control signal of navigation positioning data processor output simultaneously, and carry out AGCSignal filtering, filtered signal is controlled the intermediate frequency gain amplifier in navigator fix channel; This is externalReceive the standard clock signal that highly stable crystal oscillator provides, produce the local carrier signal for down-converted;

Navigation positioning data processor: the data signal of reception navigator fix channel output is carried out pseudo-code carrier wave and followedTrack processing, obtains pseudorange, the original observed quantity of pseudorange rates, obtains the power monitoring signal that AGC controls simultaneously,Utilize described original observed quantity to carry out navigator fix and resolve, and calculation result is stored, by described powerMonitor signal is exported to navigator fix channel;

Ionosphere supervisory channel: receive GPS radiofrequency signal from ionosphere monitoring reception antenna, and successively to letterNumber carrying out low noise amplification, down-converted, intermediate frequency amplifies and mould/number conversion, and data signal is exported toIonosphere monitored data processor; The AGC that simultaneously receives ionosphere monitored data processor output controls letterNumber, the intermediate frequency gain amplifier in the supervisory channel of ionosphere is controlled; In addition receive highly stable crystal oscillatorThe standard clock signal providing, produces the local carrier signal for down-converted;

Highly stable crystal oscillator: produce standard clock signal, export to respectively navigator fix channel, ionosphereThe second pseudo-code carrier wave in supervisory channel, navigation positioning data processor and ionosphere monitored data processor is followedTrack ring;

Ionosphere monitored data processor: comprise digital down converter, correlation calculator, width item calculator,Subtracter, low pass filter, scintillation index calculator, flicker decision device, AGC setting apparatus, the second pseudo-codeCarrier tracking loop and the second data storage, wherein:

Digital down converter: the data signal that receives ionosphere supervisory channel output is carried out Digital Down Convert,To I, Q two-way baseband complex signal, and export to correlation calculator;

Correlation calculator: receive I, the Q two-way baseband complex signal of digital down converter output, with the second pseudo-codeLocal pseudo-code, the carrier signal of carrier tracking loop output are carried out related operation, obtain two-way ionospheric scintillation prisonSurvey primary signal I_C，Q_C, and by two-way primary signal I_C，Q_CExport to respectively width item calculator, the second pseudo-codeCarrier tracking loop and AGC setting apparatus;

Width item calculator: the two-way primary signal I that receives correlation calculator output_C，Q_C, carry out data transformationProcess, obtain arrowband item power NBP and broadband item power WBP, and export to subtracter:

$WBP=\underset{i=1}{\overset{n}{\&Sigma;}}(I_{Ci}^2+Q_{Ci}^2);$

$NBP=\left(\underset{i=1}{\overset{n}{\&Sigma;}}{I}_{Ci}^2\right)+\left(\underset{i=1}{\overset{n}{\&Sigma;}}{Q}_{Ci}^2\right);$

Wherein n is positive integer;

Subtracter: receive arrowband item power NBP and the broadband item power WBP of the output of width item calculator, profitDeduct broadband item power WBP with arrowband item power NBP, obtain Amplitude scintillation detection dataSI=NBP-WBP, and export to low pass filter;

Low pass filter: the Amplitude scintillation that receives subtracter output detects uses data SI, carries out LPF placeReason, the high-frequency noise in filtering data SI, obtains pure monitored data, and outputs to scintillation index calculatingDevice;

Scintillation index calculator: receive the monitored data of low pass filter output, carry out ionospheric amplitude sudden strain of a muscleBright index calculates, and obtains ionospheric amplitude scintillation index S₄, and export to flicker decision device;

$S_4=\sqrt{\frac{<{\mathrm{SI}}^2>-<SI{>}^2}{<SI{>}^2}};$

Wherein: "<>" represent data to be averaged;

Flicker decision device: the ionospheric amplitude scintillation index S that receives the output of scintillation index calculator₄, simultaneouslyThe navigator fix calculation result that receives the output of navigation positioning data processor, judges Shuo Dian position, ionosphere and sudden strain of a muscleBright intensity, and judged result data are exported to the second data storage;

The second data storage: the judged result data that receive the output of flicker decision device are exported to number on outside starBiography system;

The second pseudo-code carrier tracking loop: the two-way primary signal I that receives correlation operator output_C，Q_C, simultaneouslyReceive the standard clock signal of highly stable crystal oscillator output, carry out pseudo-code, the tracking of carrier wave closed loop, and outputLocal pseudo-code carrier wave is to correlation calculator;

AGC setting apparatus: the two-way primary signal I that receives correlation operator output_C，Q_C, calculate signal power,Obtain AGC control signal, and export to ionosphere supervisory channel.

2. the spaceborne ionosphere of one according to claim 1 Amplitude scintillation monitoring device, is characterized in that:Described navigator fix channel comprises the first low-noise amplifier, the first frequency mixer, the first intermediate frequency amplifier,One A/D, first frequency synthesizer, an AGC controller and AGC wave filter, wherein the first low noiseAmplifier receives GPS radiofrequency signal from location reception antenna, and signal is carried out to low noise amplification, and by low noiseSignal after amplification is exported to the first frequency mixer and is carried out down-converted; Under the first intermediate frequency amplifier reception is describedSignal after frequency-conversion processing carries out intermediate frequency amplification, and the signal after intermediate frequency amplification is exported to an A/D and carry outMould/number conversion, obtains data signal and exports to navigation positioning data processor; It is fixed that AGC wave filter receives navigationThe AGC control signal of bit data processor output, carries out AGC signal filtering, filtered signal outputGive an AGC controller, the intermediate frequency gain amplifier in navigator fix channel is controlled; First frequency is combinedClose device and receive the clock signal that highly stable crystal oscillator provides, produce the local carrier letter for down-convertedNumber, export to the first frequency mixer.

3. the spaceborne ionosphere of one according to claim 1 Amplitude scintillation monitoring device, is characterized in that:Described navigation positioning data processor comprises the first pseudo-code carrier tracking loop, navigator fix solver, power inspectionSurvey device, data register and the first data storage, wherein the first pseudo-code carrier tracking loop receives navigator fixThe data signal of channel output is carried out the processing of pseudo-code carrier track, obtain pseudorange, the original observed quantity of pseudorange rates andThe power detection primary signal that AGC controls, exports to navigator fix solution by pseudorange, the original observed quantity of pseudorange ratesCalculate device, the power detection primary signal that AGC is controlled is exported to power detector; Navigator fix solver profitCarry out navigator fix with described original observed quantity and resolve, and store calculation result into data register; PowerDetector received power detects primary signal and obtains the power detection signal that AGC controls, by described power detectionSignal is exported to navigator fix channel; Calculation result in the first data storage receive data register carries outStorage.

4. the spaceborne ionosphere of one according to claim 1 Amplitude scintillation monitoring device, is characterized in that:Described ionosphere supervisory channel comprise the second low-noise amplifier, the second frequency mixer, the second intermediate frequency amplifier,The 2nd A/D, second frequency synthesizer and the 2nd AGC controller, wherein the second low-noise amplifier is from determining electricityDelamination monitoring reception antenna receives GPS radiofrequency signal, signal is carried out to low noise amplification, and low noise is amplifiedAfter signal export to the second frequency mixer and carry out down-converted; The second intermediate frequency amplifier receives described down coversionSignal after treatment carries out intermediate frequency amplification, and by intermediate frequency amplify after signal export to the 2nd A/D carry out mould/Number conversion, obtains data signal and exports to ionosphere monitored data processor; The 2nd AGC controller receives electricityThe AGC control signal of delamination monitoring data processor output, puts the second intermediate frequency in the supervisory channel of ionosphereLarge device is controlled; Second frequency synthesizer receives the clock signal that highly stable crystal oscillator provides, and produces and usesIn the local carrier signal of down-converted, export to the second frequency mixer.

5. the spaceborne ionosphere of one according to claim 1 Amplitude scintillation monitoring device, is characterized in that:Wave filter in the monitored data processor of described ionosphere is by the quadravalence Butterworth type low pass of three standardsWave filter is in series.

6. the spaceborne ionosphere of one according to claim 1 Amplitude scintillation monitoring device, is characterized in that:Described ionosphere monitoring reception antenna comprises forward detection antenna, backward detection reception and navigator fix antenna,Forward detection antenna reception forward direction ionospheric scintillation signal, backward exploring antenna receives backward ionospheric scintillation letterNumber, navigator fix antenna reception GPS navigation framing signal.