CN102520419A - Receiving system and receiving method for GNSS (global navigation satellite system) sea reflecting signal - Google Patents
Receiving system and receiving method for GNSS (global navigation satellite system) sea reflecting signal Download PDFInfo
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Abstract
The invention relates to a receiving system and a receiving method for a GNSS (global navigation satellite system) sea reflecting signal. The receiving system comprises an N-element array antenna, a radio frequency front-end module, an L waveband frequency conversion component, a real-time correcting module, an A/D (Analog/Digital), a DDC (direct digital control), a digital wave beam forming module, a synthesized signal digital up-converter module and a D/A (Digital/Analog). A width phase automatic-correcting function of a channel can be realized by the receiving system and the receiving method; the wave beam direction of the antenna can be controlled according to a satellite reflecting point position; and a practical project and a test result show that the receiving system and the receiving method provided by the invention are stable in performance, are used for stably and reliably receiving the sea reflecting signal, are applied to the field of GNSS sea remote sensing and the field of measurement by utilizing GNSS reflecting signal, such as SNSS-R soil humidity measurement, and the like, and are wide in application prospect.
Description
Technical field
The invention belongs to the satellite application field, relate to a kind of GNSS ocean reflected signal receiving system and method for reseptance.
Background technology
Along with deepening continuously of GPS (GNSS) technical research and application, aspect hydrospace detection, the application of GNSS has also obtained developing rapidly, and has produced the new branch of science-GNSS-R ocean remote sensing that is the basis with this technology.The GNSS-R marine survey technology utilizes the GNSS receiver that carries on the LEO satellite; Receive GNSS direct signal and sea return; Through the time delay between them and related function waveform and analyze along characteristic thereafter, and combine sea, wave scattering theory, obtain information such as sea average height, Ocean Wind-field, wave height, sea surface salinity electric wave; The information that combines sea surface reflection and forward scattering simultaneously can detect sea wind speed and direction information.With other ocean remote sensing compared with techniques, GNSS-R adopts the passive detection method, does not need transmitter, can realize that the whole world evenly covers, and it is big to obtain data volume, and can all weather operations, does not receive the influence of weather conditions.Therefore GNSS-R has great application prospect aspect ocean remote sensing.
Existing GNSS signal reception technique towards be the stronger GNSS direct signal of signal power, adopt the broad beam right-handed circular polarization antenna of common gain just can meet the demands.Yet the variation of two aspects has taken place through behind the sea surface reflection in the GNSS satellite navigation signals: the one, and the big high attenuation of signal power has become weak satellite navigation signals; The 2nd, variation has taken place in signal polarity, has become the left-hand circular polarization signal from the right-handed circular polarization signal.Simultaneously, since the relative motion between GNSS satellite and the LEO satellite, the earthquake constantly of the reflection spot position, ocean of GNSS signal.Therefore, how receiving through the Weak GNSS satellite-signal behind the sea surface reflection effectively reliably is the primary problem that solves in GNSS-R ocean remote sensing detection aspect.
Summary of the invention
The technical matters that the present invention solves is: overcome the deficiency of prior art, a kind of GNSS ocean reflected signal receiving system and method for reseptance are provided, can stabilizing effective receive faint GNSS ocean reflected signal.
Technical solution of the present invention: a kind of GNSS ocean reflected signal receiving system comprises: N element array antenna, RF front-end module, L-band frequency conversion assembly, real time calibration module, A/D, DDC, digital beam form module, composite signal Digital Up Convert module and D/A;
N element array antenna receives faint ocean reflected signal;
RF front-end module is placed on the N element array antenna, is receiving under the signal mode in real time, receives N element array aerial signal, carries out sending into L-band frequency conversion assembly after filtering, the amplification; Under calibration mode, receive the calibrating signal of real time calibration module output, carry out sending into L-band frequency conversion assembly after filtering, the amplification;
L-band frequency conversion assembly amplifies and down coversion;
The down-conversion signal that A/D exports L-band frequency conversion assembly converts digital signal to and sends among the DDC;
DDC carries out Digital Down Convert to be handled, and obtains N roadbed band signal, and N roadbed band signal is sent into digital beam formation module;
Digital beam forms module, and two kinds of mode of operations of real-time reception signal mode and calibration mode are arranged, and under calibration mode, digital beam forms module controls real time calibration module and produces N road amplitude and the equal standard signal of phase place, sends into RF front-end module; Become N roadbed band signal behind N road calibrating signal process RF front-end module, L-band down coversion assembly, A/D, the DDC, send into digital beam and form module; Digital beam forms the N roadbed band signal calculation correction coefficient of module according to input this moment; After correction factor calculation was accomplished, digital beam formed module controls real time calibration module, closed the generation of calibrating signal, changed real-time reception signal mode over to; Receiving under the signal mode in real time; According to the satellite reflection locus of points of ocean reflection signal receiver calculating and the relation of N element array controlling antenna wave beam to point; Utilize the airspace filter device to handle the N roadbed band signal by DDC output, through changing airspace filter device weights, the signal that makes desired orientation is through the airspace filter device; The signal that suppresses other directions simultaneously; Thereby adjust the beam position of N element array antenna in real time, in the main lobe of N element array antenna radiation pattern, it is synthetic to accomplish digital beam all the time for the specular reflection point that makes satellite;
The real time calibration module produces N road amplitude and the equal standard signal of phase place, sends into RF front-end module;
Composite signal Digital Up Convert module is transformed to digital medium-frequency signal with the digital beam composite signal;
The digital medium-frequency signal of D/A after with the conversion of composite signal Digital Up Convert module is transformed to analog if signal.
A kind of GNSS ocean reflected signal method of reseptance, performing step is following:
(1) when the beam position control signal of outside changes, changes calibration mode over to, form module controls real time calibration module by digital beam and produce N road calibrating signal, send into RF front-end module; At this moment, RF front-end module detects the validity of N road calibrating signal, cuts off from the actual signal of N element array antenna input; Behind N road calibrating signal process RF front-end module, L-band frequency conversion assembly, A/D, the DDC, become N roadbed band signal, get into digital beam and form module; Digital beam forms the N roadbed band signal calculation correction coefficient of module according to input this moment; After correction factor calculation was accomplished, digital beam formed module controls real time calibration module, closed the generation of calibrating signal, changed real-time reception signal mode over to;
(2) receiving under the signal mode in real time, the ocean reflected signal through becoming N roadbed band signal behind N element array antenna, RF front-end module, L-band frequency conversion assembly, A/D, the DDC, is sent into digital beam and is formed module successively; Digital beam forms module and at first according to calculated calibration coefficients under calibration mode N roadbed band signal is carried out the amplitude-phase correction; Eliminate the inconsistency that each module of front end brings for N roadbed band signal amplitude-phase; Then according to the satellite reflection locus of points of ocean, rear end reflection signal receiver calculating and the relation of N element array controlling antenna wave beam to point; Adopt the airspace filter technology that N roadbed band signal is carried out digital beam and form, composite signal is sent into composite signal up-conversion module; Composite signal up-conversion module is carried out upconversion process with composite signal, becomes digital medium-frequency signal, sends into D/A; D/A is transformed to analog if signal output with digital medium-frequency signal.
A kind of GNSS ocean reflected signal method of reseptance is characterized in that performing step is following:
(1) when the beam position control signal of outside changes, changes calibration mode over to, form module controls real time calibration module by digital beam and produce N road calibrating signal, send into RF front-end module; At this moment, RF front-end module detects the validity of N road calibrating signal, cuts off from the actual signal of N element array antenna input; Behind N road calibrating signal process RF front-end module, L-band frequency conversion assembly, A/D, the DDC, become N roadbed band signal, get into digital beam and form module; Digital beam forms the N roadbed band signal calculation correction coefficient of module according to input this moment; After correction factor calculation was accomplished, digital beam formed module controls real time calibration module, closed the generation of calibrating signal, changed real-time reception signal mode over to;
(2) receiving under the signal mode in real time, the ocean reflected signal through becoming N roadbed band signal behind N element array antenna, RF front-end module, L-band frequency conversion assembly, A/D, the DDC, is sent into digital beam and is formed module successively; Digital beam forms module and at first according to calculated calibration coefficients under calibration mode N roadbed band signal is carried out the amplitude-phase correction; Eliminate the inconsistency that each module of front end brings for N roadbed band signal amplitude-phase; Then according to the satellite reflection locus of points of ocean, rear end reflection signal receiver calculating and the relation of N element array controlling antenna wave beam to point; Adopt the airspace filter technology that N roadbed band signal is carried out digital beam and form, composite signal is sent into composite signal up-conversion module; Composite signal up-conversion module is carried out upconversion process with composite signal, becomes digital medium-frequency signal, sends into D/A; D/A is transformed to analog if signal output with digital medium-frequency signal.
The present invention's beneficial effect compared with prior art is:
(1) the present invention adopts real time calibration and digital beam to form technology; According to the satellite reflection locus of points of ocean reflection signal receiver calculating and the relation of N element array controlling antenna wave beam to point; Adjust the beam position of antenna in real time; Make N element array antenna radiation pattern aim at the reflection spot position, ocean of GNSS signal in real time, further improved the gain that receives the ocean reflected signal, make system can receive faint ocean reflected signal effectively reliably.
(2) the present invention adopts N element array antenna, has improved antenna gain, thereby can receive faint ocean reflected signal.
(3) the present invention adopts the baseband signal amplitude that the real time calibration module brings RF front-end module, L-band frequency conversion assembly, A/D and DDC and the inconsistency of phase place to proofread and correct, and the inconsistency of eliminating baseband signal amplitude and phase place is to the back-end processing errors caused.
Description of drawings
Fig. 1 is a principle of the invention block diagram;
Fig. 2 is a RF front-end module composition frame chart of the present invention;
Fig. 3 is a L-band frequency conversion assembly composition frame chart of the present invention;
Fig. 4 obtains schematic diagram for calibrate coefficient of the present invention;
Fig. 5 is an airspace filter device schematic diagram of the present invention;
Fig. 6 realizes schematic diagram for digital beam of the present invention forms module;
Fig. 7 forms module mathematical simulation figure for digital beam of the present invention.
Embodiment
(1) receiving system is formed
As shown in Figure 1, receiving system of the present invention comprises that N element array antenna, RF front-end module, L-band frequency conversion assembly, real time calibration module, A/D, DDC, digital beam form module, composite signal Digital Up Convert module and D/A.
(1) N element array antenna
Because the GNSS signal is after the ocean surface reflection; Signal power is by decay significantly; The received ocean reflection signal power of receiver is reflected than more than the low 30dB of direct signal power in the ocean that operates on 500km to the 800km height LEO satellite, and this just requires the ocean reflecting antenna to have higher gain.Simultaneously; The reflection wave that the navigation satellite signal direct projection produces behind the sea receives the influence of factors such as sea surface roughness; The reflection spot of navigation satellite signal is an elliptical region, and ocean reflected antenna beam width must cover this echo area, just can make the back-end system operate as normal.
In order to satisfy above-mentioned needs, the ocean reflecting antenna is selected the micro-strip antenna array scheme of low section.According to the ultimate principle of two-dimensional planar array antenna, array number is many more on the dimension direction, and the antenna full gain is high more, but the directional diagram wave beam on this dimension direction is narrow more.Therefore when design, need satisfy the demand of antenna, consider the beam angle in the actual use of antenna again gain.Through a large amount of tests, N element array antenna of the present invention adopts 2 * 16 microstrip array, and carries out the scanning of one dimension digital beam, so just can take into account the requirement that gain and scanning cover.And N element array antenna is single antennas of receiving, and its working frequency range relative narrower is suitable for adopting the mode of digital beam control to scan.
(2) RF front-end module
The composition frame chart of RF front-end module is as shown in Figure 2.RF front-end module comprises switch module, front-end filtering module and low noise amplification module three parts that can switch normal and calibration mode of operation.Switch module is used to switch normal mode of operation and normal operating mode; Under calibration mode of operation, N road amplitude and the equal standard signal of phase place that the input signal of RF front-end module produces for the real time calibration module, and under the normal mode of operation, the input signal of RF front-end module is the signal from the output of N element array antenna.The front-end filtering module is used for the outside undesired signal of filtering.The low noise amplification module amplifies the signal of front-end filtering module output.
(3) L-band frequency conversion assembly
L-band frequency conversion assembly is accomplished down coversion, filtering and the amplification of signal.Fig. 3 is the composition frame chart of L-band frequency conversion assembly.The L-band signal at first amplifies undesired signal outside wave filter A filtering band through amplifier A; Temperature compensating crystal oscillator, PLL and amplifier B form the local oscillation signal generator; The signal of local oscillation signal and wave filter A output carries out Frequency mixing processing, and Frequency mixing processing is moved signal spectrum, except that producing the desired intermediate frequency signal, also can produce the mirror image undesired signal; The signal of frequency mixer output is through wave filter B filtering mirror image undesired signal, and the intermediate-freuqncy signal of output expectation is sent into the automatic gain control module; The automatic gain control module adopts detecting circuit and directional coupler that the desired intermediate frequency signal amplitude is adjusted; Wave filter C carries out Filtering Processing to the intermediate-freuqncy signal of automatic gain control module output, the interference that detecting circuit and directional coupler produce the desired intermediate frequency signal in the filtering automatic gain module.
(4) real time calibration module
Under calibration mode, digital beam forms module controls real time calibration module and produces N road amplitude and the equal standard signal of phase place, sends into RF front-end module.Behind standard signal process RF front-end module, L-band frequency conversion assembly, A/D and the DDC, become N roadbed band signal.N roadbed band signal is sent into digital beam and is formed module, forms in the module at digital beam N roadbed band signal is measured, and it is poor to obtain amplitude-phase, calculates calibration factor.
Receiving under the signal mode in real time, digital beam forms module controls real time calibration module and does not produce calibrating signal, and the real time calibration module is not worked.
(5)A/D
A/D is an analog-digital converter, and it has directly determined quantified precision, the linearity and the maximum input bandwidth of simulating signal.The present invention has considered following factor to the selection of A/D:
A) slewing rate has determined maximum sampling rate;
B) analog input upper frequency limit has determined the highest frequency of the simulating signal that system can handle;
C) change figure place, determined the maximum undistorted dynamic range of input signal;
D) linearity has determined the harmonic component of input signal;
E) output level standard has determined the interface compatibility of subsequent device;
F) the input analogue signal amplitude has determined sensitivity;
G) power consumption, peripheral circuit etc. have determined the difficulty of circuit design.
(6)DDC
DDC is a digital down converter, and its implementation mainly contains FPGA and ASIC dual mode.Digital down converter main flow implementation has FPGA and ASIC dual mode at present.
FPGA is good at concurrent operation and pipeline processes, can satisfy DDC to the high speed processing demand; In addition, because the dirigibility of FPGA design makes the DDC module realize resource and optimization in Properties according to specifically system requirements are customized, be particularly suitable for the occasion that some need high bandwidth or particular sample rate.Shortcoming is, the very flexible of parameter adjustment is difficult to realize bandwidth varying, and the efficient of program and reliability are difficult to guarantee that the developing and debugging difficulty is big that it is more to take the FPGA resource in addition.
Because the widespread use of DDC in radio system, IC manufacturer has released various DDC special chips (ASIC).The performance of ASIC is through strict checking, and the relative FPGA program of its reliability and stability is much higher; But its inner parameter of user's flexible configuration is to realize different indexs.But the structure of ASIC is fixed, and handling property has certain limitation, can't be applied to special occasions.
Native system is not high to the processing bandwidth requirement of DDC, and FPGA and ASIC can realize, but ASIC realizes that reliability stability is higher, has therefore selected employing special purpose DDC chip to realize Digital Down Convert.
(7) the airspace filter device is realized principle
Receiving system of the present invention utilizes the airspace filter device to handle the N unit baseband signal of DDC output, and through changing filter weights, the signal that can make some desired orientation suppresses the signal of other directions simultaneously through wave filter.It is as shown in Figure 5 that wave beam forms principle.
The reception signal of M unit even linear array is as the input of M tap transversal filter, and the wave filter weight vector can be expressed as
w＝[w
0?w
1…w
N-1]
T
Plane wave s (n) incides on the array with angle θ, and with first array element array element as a reference, then the array received signal can be expressed as
x(n)＝a(θ)s(n)
The guiding vector of even linear array wherein
a(θ)＝[]a(θ)＝[1?e
-jφ…e
-j(M-1)φ]
T
φ＝2πdsinθ/λ。
The airspace filter device is output as
y(n)＝w
Hx(n)＝w
Ha(θ)s(n)
Can find out from following formula, if weighting vector w satisfies w
HA (θ)=0, so
y(n)＝0
Following formula shows that the signal of θ direction is suppressed, and can not pass through wave filter.If make weight vector w satisfy w=a (θ), so
y(n)＝a
H(θ)a(θ)s(n)＝Ms(n)
Following formula shows that the signal of θ direction can pass through wave filter, and is exaggerated M doubly.So,, can make the signal of some direction pass through wave filter, and suppress the signal of other directions, or change the amplitude of output signal through changing the weight vector w of airspace filter device.
Suppose known vacant wave filter weight vector w, the directional diagram of definition airspace filter for the ratio of output signal and the amplitude of input signal does
Similar with the frequency response of time domain filtering, directional diagram has been described the response of airspace filter device to space different directions signal.Notice F
2(θ) be the ratio of airspace filter device output input instantaneous power.
If select the weight vector amplitude of airspace filter device identical, only phase place evenly increases progressively, for
Wherein, φ
0=2 π dsin θ
0/ λ then has
At this moment, beam pattern is at θ=θ
0The place obtains maximal value, makes from θ
0With superimposed, output is maximum at the output terminal of wave filter for the signal of direction incident.Therefore change φ
0(or θ
0) can change the sensing of wave beam, thus realize the scanning (being called for short electricity sweeps) of beam position.
(8) digital beam forms module
Under calibration mode, digital beam forms the calculating that module is accomplished calibration factor.
Fig. 4 obtains schematic diagram for the calibrate coefficient.X
1(t) the N road amplitude and the equal standard signal of phase place that produce for the real time calibration module; Calibrating signal postpones and changes in amplitude through producing different phase behind different RF front-end module, L-band frequency conversion assembly, A/D and the DDC, and the base band data of DDC output is respectively X
1(n), X
2(n) ..., X
N(n).If with the first passage is reference channel, the correction coefficient that can obtain the i passage so is:
C
i＝X
1(n)/X
i(n)，i＝2，...，N
Under the live signal receiving mode, realize principle according to the airspace filter device, digital beam forms the realization block diagram of module and sees Fig. 6.Wherein, x=[x
1, x
2..., x
N] be the N unit baseband signal that is input to digital beam formation module,
Be the weight vector of digital beam formation module,
In, d is the vertical range between the adjacent array element of N element array antenna, λ is the wavelength of GNSS signal, θ
1When inciding N element array bay for the ocean reflected signal, with the angle of N element array bay normal direction, its output signal is:
The present invention adopts the simulating GPS signal; Digital beam is formed module adopt Matlab to carry out mathematical simulation, the frequency of in simulated conditions, setting GPS is 1575.42MHz ± 1.023MHz, and the signal incident angle is respectively 0 °; 25 °, the received beam figure that obtains is as shown in Figure 7.Can find out from analogous diagram; When the signal incident angle is respectively 0 °; In the time of 25 °, the space angle of received beam figure main lobe central point is respectively 0 °, 25 °; The received beam figure that this explanation digital beam forms module can change along with the variation of signal incident angle, thereby has accomplished digital beam formation.
(9) composite signal Digital Up Convert module
Synthetic digital signal up-conversion module is transformed to digital medium-frequency signal with the digital baseband signal that digital beam forms module output.Its process is following: at first between the adjacent digital baseband signal of digital beam formation module output, insert null value, be used for increasing the signals sampling rate; Can make signal on frequency domain, produce the mirror image of signal spectrum owing in time domain, insert null value, therefore adopt low-pass filter that the image spectra of signal is carried out filtering to data; Signal with low-pass filter output carries out mixing through digital controlled oscillator and frequency mixer at last, the output digital medium-frequency signal.
(10)D/A
D/A is a digital analog converter, and it converts the digital medium-frequency signal of synthetic digital signal up-conversion module output into analog if signal.The present invention adopts high performance D/A chip AD9777 to accomplish the conversion of digital medium-frequency signal to analog if signal, and the image frequency that adopts seven rank low pass elliptic filter filtering digital-to-analogue conversion to cause.
(2) method of reseptance
(1) when the beam position control signal of outside changes, changes calibration mode over to, form module controls real time calibration module by digital beam and produce N road calibrating signal, send into RF front-end module; At this moment, RF front-end module detects the validity of N road calibrating signal, cuts off from the actual signal of N element array antenna input; Behind N road calibrating signal process RF front-end module, L-band frequency conversion assembly, A/D, the DDC, become N roadbed band signal, get into digital beam and form module; Digital beam forms the N roadbed band signal calculation correction coefficient of module according to input this moment; After correction factor calculation was accomplished, digital beam formed module controls real time calibration module, closed the generation of calibrating signal, changed real-time reception signal mode over to;
(2) receiving under the signal mode in real time, the ocean reflected signal through becoming N roadbed band signal behind N element array antenna, RF front-end module, L-band frequency conversion assembly, A/D, the DDC, is sent into digital beam and is formed module successively; Digital beam forms module and at first according to calculated calibration coefficients under calibration mode N roadbed band signal is carried out the amplitude-phase correction; Eliminate the inconsistency that each module of front end brings for N roadbed band signal amplitude-phase; Then according to the satellite reflection locus of points of ocean, rear end reflection signal receiver calculating and the relation of N element array controlling antenna wave beam to point; Adopt the airspace filter technology that N roadbed band signal is carried out digital beam and form, composite signal is sent into composite signal up-conversion module; Composite signal up-conversion module is carried out upconversion process with composite signal, becomes digital medium-frequency signal, sends into D/A; D/A is transformed to analog if signal output with digital medium-frequency signal.
Show this receiving system and method for reseptance stable performance, reception ocean reflected signal that can be reliable and stable through actual Project Realization and test findings.The present invention not only can be applicable to GNSS ocean remote sensing field, also can be applicable to the field that GNSS-R soil humidity measuring etc. utilizes the GNSS reflected signal to measure, and has broad prospect for its application.
Claims (2)
1. a GNSS ocean reflected signal receiving system is characterized in that comprising: N element array antenna, RF front-end module, L-band frequency conversion assembly, real time calibration module, A/D, DDC, digital beam formation module, composite signal Digital Up Convert module and D/A;
N element array antenna receives faint ocean reflected signal;
RF front-end module is placed on the N element array antenna, is receiving under the signal mode in real time, receives N element array aerial signal, carries out sending into L-band frequency conversion assembly after filtering, the amplification; Under calibration mode, receive the calibrating signal of real time calibration module output, carry out sending into L-band frequency conversion assembly after filtering, the amplification;
L-band frequency conversion assembly amplifies and down coversion;
The down-conversion signal that A/D exports L-band frequency conversion assembly converts digital signal to and sends among the DDC;
DDC carries out Digital Down Convert to be handled, and obtains N roadbed band signal, and N roadbed band signal is sent into digital beam formation module;
Digital beam forms module, and two kinds of mode of operations of real-time reception signal mode and calibration mode are arranged, and under calibration mode, digital beam forms module controls real time calibration module and produces N road amplitude and the equal standard signal of phase place, sends into RF front-end module; Become N roadbed band signal behind N road calibrating signal process RF front-end module, L-band down coversion assembly, A/D, the DDC, send into digital beam and form module; Digital beam forms the N roadbed band signal calculation correction coefficient of module according to input this moment; After correction factor calculation was accomplished, digital beam formed module controls real time calibration module, closed the generation of calibrating signal, changed real-time reception signal mode over to; Receiving under the signal mode in real time; According to the satellite reflection locus of points of ocean reflection signal receiver calculating and the relation of N element array controlling antenna wave beam to point; Utilize the airspace filter device to handle the N roadbed band signal by DDC output, through changing airspace filter device weights, the signal that makes desired orientation is through the airspace filter device; The signal that suppresses other directions simultaneously; Thereby adjust the beam position of N element array antenna in real time, in the main lobe of N element array antenna radiation pattern, it is synthetic to accomplish digital beam all the time for the specular reflection point that makes satellite;
The real time calibration module produces N road amplitude and the equal standard signal of phase place, sends into RF front-end module;
Composite signal Digital Up Convert module is transformed to digital medium-frequency signal with the digital beam composite signal;
The digital medium-frequency signal of D/A after with the conversion of composite signal Digital Up Convert module is transformed to analog if signal.
2. GNSS ocean reflected signal method of reseptance is characterized in that performing step is following:
(1) when the beam position control signal of outside changes, changes calibration mode over to, form module controls real time calibration module by digital beam and produce N road calibrating signal, send into RF front-end module; At this moment, RF front-end module detects the validity of N road calibrating signal, cuts off from the actual signal of N element array antenna input; Behind N road calibrating signal process RF front-end module, L-band frequency conversion assembly, A/D, the DDC, become N roadbed band signal, get into digital beam and form module; Digital beam forms the N roadbed band signal calculation correction coefficient of module according to input this moment; After correction factor calculation was accomplished, digital beam formed module controls real time calibration module, closed the generation of calibrating signal, changed real-time reception signal mode over to;
(2) receiving under the signal mode in real time, the ocean reflected signal through becoming N roadbed band signal behind N element array antenna, RF front-end module, L-band frequency conversion assembly, A/D, the DDC, is sent into digital beam and is formed module successively; Digital beam forms module and at first according to calculated calibration coefficients under calibration mode N roadbed band signal is carried out the amplitude-phase correction; Eliminate the inconsistency that each module of front end brings for N roadbed band signal amplitude-phase; Then according to the satellite reflection locus of points of ocean, rear end reflection signal receiver calculating and the relation of N element array controlling antenna wave beam to point; Adopt the airspace filter technology that N roadbed band signal is carried out digital beam and form, composite signal is sent into composite signal up-conversion module; Composite signal up-conversion module is carried out upconversion process with composite signal, becomes digital medium-frequency signal, sends into D/A; D/A is transformed to analog if signal output with digital medium-frequency signal.
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| CN103076618B (en) * | 2012-12-26 | 2014-10-08 | 北京空间飞行器总体设计部 | Method for performing ground check and performance evaluation on satellite-borne measurement-type GNSS (Global Navigation Satellite System) receiver |
| CN103076618A (en) * | 2012-12-26 | 2013-05-01 | 北京空间飞行器总体设计部 | Method for performing ground check and performance evaluation on satellite-borne measurement-type GNSS (Global Navigation Satellite System) receiver |
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| CN106936522A (en) * | 2017-02-13 | 2017-07-07 | 京信通信技术(广州)有限公司 | A kind of intelligent antenna channel calibration method and calibrating installation |
| CN106936522B (en) * | 2017-02-13 | 2020-08-28 | 京信通信系统（中国）有限公司 | Intelligent antenna channel calibration method and calibration device |
| CN107356943A (en) * | 2017-06-01 | 2017-11-17 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Digital beam froming and phase-fitting method |
| CN109752705A (en) * | 2017-11-03 | 2019-05-14 | 中电科海洋信息技术研究院有限公司 | High-frequency water acoustic array performance parameter measurement method and system, equipment and storage medium |
| CN108400785A (en) * | 2018-02-10 | 2018-08-14 | 广东圣大电子有限公司 | A kind of miniaturization microwave broadband victory frequency Up/Down Conversion system and calibration method |
| CN110149157A (en) * | 2018-02-11 | 2019-08-20 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Array antenna wideband channel parallel calibration method |
| CN109116387A (en) * | 2018-10-24 | 2019-01-01 | 曲卫 | Navigational satellite reflected signal intermediate frequency Enhancement Method |
| CN110440685A (en) * | 2019-07-16 | 2019-11-12 | 金华航大北斗应用技术有限公司 | A kind of GNSS-R bank base offshore spilled oil remote detecting method |
| WO2021035705A1 (en) * | 2019-08-30 | 2021-03-04 | 华为技术有限公司 | Antenna correction device and antenna correction method |
| CN110824466A (en) * | 2019-10-28 | 2020-02-21 | 南京理工大学 | Multi-target tracking system and DBF channel calibration FPGA implementation method thereof |
| CN111431556A (en) * | 2020-06-10 | 2020-07-17 | 深圳市南方硅谷半导体有限公司 | Transceiver with calibration function |
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