CN115508867A - GNSS-R receiver double-antenna signal collaborative correlation processing system and method - Google Patents
GNSS-R receiver double-antenna signal collaborative correlation processing system and method Download PDFInfo
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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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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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
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a GNSS-R receiver double-antenna signal collaborative correlation processing system and a method, the system estimates specific parameters of signal carrier-to-noise ratio, satellite Doppler information, code phase and the like by utilizing a GNSS direct signal received by an upper viewing antenna, reconstructs a correlation peak of direct signal leakage interference by utilizing the specific parameters, generates a corresponding DDM image, is used for assisting the correlation process of a reflection signal received by a lower viewing antenna and a local code, and eliminates and reconstructs DDM in a reflection correlation waveform, thereby inhibiting the direct leakage interference and finally improving the quality of output DDM.
Description
Technical Field
The invention belongs to the field of Global Navigation Satellite Systems (GNSS), and particularly relates to a GNSS-R receiver double-antenna signal cooperative correlation processing System and method.
Background
The global navigation satellite system is a satellite-based radio positioning, navigation and time service system, including the Chinese Beidou system, the American global positioning system, the European Galileo and the Russian glonass systems, and the like. The GNSS-R technology utilizes the GNSS reflected signal to detect the earth surface, and has wide application in the aspects of sea surface wind speed detection, ground humidity sensing and the like.
GNSS-R receivers often form a delay-doppler map (DDM) by correlating a received reflected signal with a local signal, and extract relevant feature values by processing the image, thereby inverting the characteristics of a desired perceived object. In a specific implementation, the antenna for receiving the reflected signal often adopts a left-handed circularly polarized antenna, so as to avoid the influence of the direct signal. However, since the GNSS signal is relatively weak in reflection, the reflection antenna of the GNSS-R receiver is susceptible to leakage interference caused by the direct signal passing through the radio frequency while receiving the reflected signal, so that the formed DDM image includes a correlation peak caused by the direct signal, thereby causing various problems during the reflected signal processing, which affects the accuracy and stability of the system.
Therefore, the problems of low signal-to-noise ratio of the reflected signal, limited coherent integration time, direct leakage interference and the like existing in the GNSS-R receiver are technical problems to be solved urgently.
Disclosure of Invention
Aiming at the technical problems that the signal-to-noise ratio of a reflection signal in a GNSS-R receiver is low and the GNSS-R receiver is easy to suffer from direct leakage interference, an orthometric signal auxiliary method can be adopted for improvement. Based on the high consistency of parameters of direct signals and reflected signals in the GNSS-R receiver and the great difference of signal-to-noise ratios, the estimation information of the direct signals is fully mined, the related processing of the reflected signals is assisted and enhanced, and the direct leakage interference is eliminated by using a related peak reconstruction mode, so that the quality of the output DDM is improved. Therefore, the invention provides a GNSS-R receiver double-antenna signal collaborative correlation processing system and method, which can effectively improve the quality and reliability of DDM output by the GNSS-R receiver.
The idea of the invention is as follows:
the GNSS-R receiver double-antenna signal collaborative correlation processing system estimates specific parameters such as a carrier-to-noise ratio, satellite Doppler information and a code phase of a signal by using a direct signal received by an upper viewing antenna, reconstructs a correlation peak of direct signal leakage interference by using the specific parameters, generates a corresponding DDM image, is used for assisting the correlation process of a reflected signal received by a lower viewing antenna and a local code, and eliminates the reconstructed DDM in a reflection correlation waveform, so that the direct leakage interference is inhibited, and the quality of the output DDM is finally improved.
The invention adopts the following technical scheme:
according to an aspect of the present invention, the present invention provides a GNSS-R receiver dual-antenna signal decorrelation processing system, including: the system comprises an upper view antenna, a direct signal radio frequency front end, a direct signal processing unit, a code generator, an auxiliary information generating unit, a direct leakage interference signal reconstruction unit, a lower view antenna, a reflected signal radio frequency front end and a reflected signal processing unit;
the upper viewing antenna, the direct signal radio frequency front end and the direct signal processing unit are sequentially connected, and the output of the direct signal processing unit is respectively connected to the code generator and the auxiliary information generating unit;
the outputs of the code generator and the auxiliary information generating unit are used as inputs and are connected to the direct leakage interference signal reconstruction unit;
the downward-looking antenna, the reflected signal radio-frequency front end and the reflected signal processing unit are sequentially connected, and the code generator and the direct leakage interference signal reconstruction unit are connected with the reflected signal processing unit in output;
the direct-projection GNSS signal is received by the upper-view antenna and transmitted to the direct-projection signal radio frequency front end, the direct-projection signal radio frequency front end carries out down-conversion and sampling on the direct-projection GNSS signal and outputs a digital intermediate-frequency signal to the direct-projection signal processing unit, the direct-projection signal processing unit processes the digital intermediate-frequency signal and adjusts the code generator according to the output result of the direct-projection signal processing unit, and the auxiliary information generating unit extracts auxiliary information comprising a code phase, doppler and a direct-projection signal carrier-to-noise ratio by using the output result of the direct-projection signal processing unit;
the direct leakage interference related peak reconstruction unit reconstructs DDM caused by interference by using the result and auxiliary information output by the code generator to generate reconstructed DDM;
the downward-looking antenna receives the reflected signal, generates an original DDM by correlating with a result output by the code generator after the reflected signal is processed by the radio frequency front end of the reflected signal, deducts the reconstructed DDM from the original DDM, and outputs the final high-quality DDM.
Preferably, the direct signal processing unit includes a correlator and a carrier generator;
the carrier generator generates a carrier, the carrier is multiplied by a digital intermediate frequency signal output by a direct signal radio frequency front end to generate a baseband signal, the baseband signal is multiplied by a pseudo code generated by the code generator to generate three paths of related signals of morning, noon and evening, and the related signals are transmitted to the correlator;
the output of the correlator is processed by utilizing a carrier tracking algorithm, a carrier generator is further adjusted, and carrier information is transmitted to an auxiliary information generating unit;
processing the output of the correlator by using a code tracking algorithm, further adjusting a code generator, and transmitting code information to an auxiliary information generating unit;
the code generator generates code phase information according to a code tracking algorithm;
an auxiliary information generating unit generates auxiliary information including code phase, doppler, direct signal carrier-to-noise ratio, using the carrier information, the code information, and the output of the correlator.
According to another aspect of the present invention, the present invention provides a GNSS-R receiver dual-antenna signal collaborative correlation processing method, including the following steps:
s1: the direct-projection GNSS signal is received by the upper-view antenna and transmitted to the direct-projection signal radio frequency front end, the direct-projection signal radio frequency front end carries out down-conversion and sampling on the direct-projection GNSS signal and outputs a digital intermediate-frequency signal to the direct-projection signal processing unit, the direct-projection signal processing unit processes the digital intermediate-frequency signal and adjusts the code generator according to the output result of the direct-projection signal processing unit, and the auxiliary information generating unit extracts auxiliary information comprising a code phase, doppler and a direct-projection signal carrier-to-noise ratio by using the output result of the direct-projection signal processing unit;
s2: the direct leakage interference related peak reconstruction unit reconstructs DDM caused by interference by using the result and auxiliary information output by the code generator to generate reconstructed DDM;
s3: the downward-looking antenna receives the reflected signal, after the reflected signal is processed by the radio frequency front end, the reflected signal is correlated with the result output by the code generator to generate an original DDM, the reconstructed DDM is deducted from the original DDM, and the final high-quality DDM is output.
Preferably, step S1 comprises:
s1.1: the direct-view antenna receives a direct GNSS signal and transmits the direct-view GNSS signal to the direct-view signal radio frequency front end, and the direct-view signal radio frequency front end performs down-conversion and sampling on the direct-view GNSS signal and outputs a digital intermediate frequency signal to the direct-view signal processing unit;
s1.2: a carrier wave generator in the direct-injection signal processing unit generates a carrier wave, the carrier wave is multiplied by a digital intermediate frequency signal to generate a baseband signal, the baseband signal is multiplied by a pseudo code generated by a code generator to generate three paths of related signals of morning, noon and evening, and the related signals are transmitted to a correlator;
s1.3: the direct signal processing unit processes the output of the correlator by utilizing a carrier tracking algorithm, further adjusts a carrier generator and transmits carrier information to the auxiliary information generating unit;
s1.4: the direct signal processing unit processes the output of the correlator by using a code tracking algorithm, further adjusts the code generator and transmits code information to the auxiliary information generating unit;
s1.5: the code generator generates code phase information according to a code tracking algorithm;
s1.6: the side information generating unit generates side information using the carrier information, the code information, and the output of the correlator.
Preferably, step S2 comprises:
s2.1: the direct leakage interference related peak reconstruction unit estimates the carrier-to-noise ratio of direct leakage interference by utilizing the carrier-to-noise ratio of a direct signal based on the calibration gain difference of the top-view antenna and the bottom-view antenna;
s2.2: according to carrier-to-noise ratio estimation information of the direct leakage interference, a direct leakage interference correlation peak reconstruction unit expands a code phase near Doppler to generate a time-frequency two-dimensional signal, and performs correlation integration by using code phase information output by a code generator and the time-frequency two-dimensional signal;
s2.3: and the direct leakage interference correlation peak reconstruction unit performs phase adjustment on the result of correlation integral output according to the code phase and the interval size of Doppler expansion, further generates a leakage interference correlation peak and outputs a reconstructed DDM.
Preferably, step S3 comprises:
s3.1: the reflected signal processing unit performs correlation operation by using a digital intermediate frequency signal output by a radio frequency front end of the reflected signal and code phase information generated by a code generator to obtain an original DDM;
s3.2: and the reflected signal processing unit performs matching detection on the reconstructed DDM generated by the direct-radiation leakage interference correlation peak reconstruction unit in the original DDM, and subtracts the detected leakage interference to obtain the final high-quality DDM image output.
The technical scheme provided by the invention has the beneficial effects that:
(1) The direct leakage interference related peak reconstruction utilizes a tracking signal in the direct signal processing, and the signal reconstruction precision is high;
(2) All operations are processed through digital signals, no additional hardware resource is added, and real-time processing can be achieved;
(3) The direct signal is used for assisting to improve the accuracy of the reflected signal, the overall performance of the existing GNSS-R receiver is fundamentally and effectively improved, and the observation quality of the output DDM is further improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of a GNSS-R receiver dual-antenna signal co-correlation processing system according to an embodiment of the present invention;
FIG. 2 is a flow chart of direct signal processing in a GNSS-R receiver dual-antenna signal co-correlation processing method according to an embodiment of the present invention;
FIG. 3 is a flow chart of direct leakage interference rejection based on correlation peak reconstruction in a GNSS-R receiver dual-antenna signal cooperative correlation processing method according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a reflected signal processing method in a GNSS-R receiver dual-antenna signal co-correlation processing method according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The first embodiment is as follows:
referring to fig. 1, the present invention provides a GNSS-R receiver dual-antenna signal decorrelation processing system, including: the system comprises an upper view antenna, a direct signal radio frequency front end, a direct signal processing unit, a code generator, an auxiliary information generating unit, a direct leakage interference signal reconstruction unit, a lower view antenna, a reflected signal radio frequency front end and a reflected signal processing unit;
the upper viewing antenna, the direct signal radio frequency front end and the direct signal processing unit are sequentially connected, and the output of the direct signal processing unit is respectively connected to the code generator and the auxiliary information generating unit;
the outputs of the code generator and the auxiliary information generating unit are used as inputs and are connected to the direct leakage interference signal reconstruction unit;
the downward-looking antenna, the reflected signal radio-frequency front end and the reflected signal processing unit are sequentially connected, and the code generator and the direct leakage interference signal reconstruction unit are connected with the reflected signal processing unit in output;
the direct-radiation signal processing unit processes the digital intermediate-frequency signal, adjusts a code generator according to the output result of the direct-radiation signal processing unit, and the auxiliary information generating unit extracts auxiliary information comprising a code phase, doppler and a direct-radiation signal carrier-to-noise ratio by using the output result of the direct-radiation signal processing unit;
the direct leakage interference correlation peak reconstruction unit reconstructs the DDM caused by the interference by using the result and the auxiliary information output by the code generator to generate a reconstructed DDM;
the downward-looking antenna receives the reflected signal, generates an original DDM by correlating with a result output by the code generator after the reflected signal is processed by the radio frequency front end of the reflected signal, deducts the reconstructed DDM from the original DDM, and outputs the final high-quality DDM.
Referring to fig. 2, the direct signal processing unit includes a correlator and a carrier generator;
the carrier wave generator generates a carrier wave, the carrier wave is multiplied by a digital intermediate frequency signal output by a direct signal radio frequency front end to generate a baseband signal, the baseband signal is multiplied by a pseudo code generated by the code generator to generate three paths of related signals of morning, noon and evening, and the related signals are transmitted to the correlator;
the output of the correlator is processed by utilizing a carrier tracking algorithm, a carrier generator is further adjusted, and carrier information is transmitted to an auxiliary information generating unit;
processing the output of the correlator by using a code tracking algorithm, further adjusting the code generator, and transmitting the code information to the auxiliary information generating unit;
the code generator generates code phase information according to a code tracking algorithm;
an auxiliary information generating unit generates auxiliary information including code phase, doppler, direct signal carrier-to-noise ratio, using the carrier information, the code information, and the output of the correlator.
Example two:
referring to fig. 2 to 4, the present embodiment provides a GNSS-R receiver dual-antenna signal co-correlation processing method, which is implemented based on the GNSS-R receiver dual-antenna signal co-correlation processing system in the first embodiment, and the method includes the following steps:
s1: the direct-projection GNSS signal is received by the upper-view antenna and transmitted to the direct-projection signal radio frequency front end, the direct-projection signal radio frequency front end carries out down-conversion and sampling on the direct-projection GNSS signal and outputs a digital intermediate-frequency signal to the direct-projection signal processing unit, the direct-projection signal processing unit processes the digital intermediate-frequency signal and adjusts the code generator according to the output result of the direct-projection signal processing unit, and the auxiliary information generating unit extracts auxiliary information comprising a code phase, doppler and a direct-projection signal carrier-to-noise ratio by using the output result of the direct-projection signal processing unit;
s2: the direct leakage interference correlation peak reconstruction unit reconstructs the DDM caused by the interference by using the result and the auxiliary information output by the code generator to generate a reconstructed DDM;
s3: the downward-looking antenna receives the reflected signal, generates an original DDM by correlating with a result output by the code generator after the reflected signal is processed by the radio frequency front end of the reflected signal, deducts the reconstructed DDM from the original DDM, and outputs the final high-quality DDM.
As a preferred embodiment, referring to fig. 2, the direct signal processing flow corresponding to step S1 includes the following steps:
s1.1: the direct-view antenna receives direct GNSS signals and transmits the direct-view GNSS signals to the direct-view signal radio frequency front end, and the direct-view signal radio frequency front end performs down-conversion and sampling on the direct-view GNSS signals and outputs digital intermediate frequency signals to the direct-view signal processing unit;
s1.2: a carrier generator in the direct-injection signal processing unit generates a carrier, the carrier is multiplied by a digital intermediate frequency signal to generate a baseband signal, the baseband signal is multiplied by a pseudo code generated by a code generator to generate three paths of correlation signals of morning, middle and Evening (EPL), and the correlation signals are transmitted to a correlator;
s1.3: the direct signal processing unit processes the output of the correlator by utilizing a carrier tracking algorithm, further adjusts a carrier generator and transmits carrier information to the auxiliary information generating unit;
s1.4: the direct signal processing unit processes the output of the correlator by using a code tracking algorithm, further adjusts the code generator and transmits code information to the auxiliary information generating unit;
s1.5: the code generator generates code phase information according to a code tracking algorithm;
s1.6: the side information generating unit generates side information using the carrier information, the code information, and the output of the correlator.
As a preferred embodiment, referring to fig. 3, the direct leakage interference rejection process based on correlation peak reconstruction corresponding to step S2 includes the following steps:
s2.1: the direct leakage interference correlation peak reconstruction unit estimates the carrier-to-noise ratio of direct leakage interference by utilizing the carrier-to-noise ratio of a direct signal based on the calibration gain difference of the top-view antenna and the bottom-view antenna; the formula is as follows:
CN 0 _interference＝CN 0 _signal-Gain
in the above formula, CN 0 _intereference denotes the direct leakage interference carrier to noise ratio, CN 0 Signal represents the direct signal carrier-to-noise ratio and Gain represents the calibration Gain difference.
S2.2: according to carrier-to-noise ratio estimation information of the direct leakage interference, a direct leakage interference correlation peak reconstruction unit expands a code phase near Doppler to generate a time-frequency two-dimensional signal, and performs correlation integration by using code phase information output by a code generator and the time-frequency two-dimensional signal; the operation formula is as follows:
in the above equation, Z (N) is a correlation integration output result, N is the number of discrete data points participating in the correlation operation, x (k) is code phase information output by the code generator, y (k-N) is a signal in which a code phase estimated for a direct signal is spread over a certain doppler, N is a general code number in the communication field for representing the signal as a digital signal, and k in y (k-N) represents that the digital signal is shifted by k times.
S2.3: and the direct leakage interference correlation peak reconstruction unit performs phase adjustment on the result of correlation integral output according to the code phase and the interval size of Doppler expansion, further generates a leakage interference correlation peak and outputs a reconstructed DDM.
Wherein, the phase adjustment formula is as follows:
in the above formula, complete (Z) is the result after phase adjustment, a is the power of the correlation integration output result, T is the correlation time, f z For the associated Doppler frequency, θ z For the initial phase of the output signal,
the signal is an analog signal and is a general code number in the communication field.
As a preferred embodiment, referring to fig. 4, the reflected signal processing flow corresponding to step S3 includes the following steps:
s3.1: the reflected signal processing unit performs correlation operation by using a digital intermediate frequency signal output by the radio frequency front end of the reflected signal and code phase information generated by the code generator to obtain an original DDM image;
the operation formula is as follows:
in the above equation, Z '(N) is the correlation operation output result, N is the number of discrete data points participating in the correlation operation, x' (k) is the code phase output by the code generator, y '(k-N) is the digital intermediate frequency signal of the reflected signal, N is a general code number in the communication field indicating that the signal is a digital signal, and k in y' (k-N) indicates that the digital signal is shifted by k times.
S3.2: and the reflected signal processing unit performs matching detection on the reconstructed DDM generated by the direct leakage interference correlation peak reconstruction unit in the original DDM image, and subtracts the detected leakage interference to obtain the final high-quality DDM image output.
It should be noted that, the matching detection refers to aligning peak points of an original DDM image and a reconstructed DDM image, so as to align two-dimensional coordinates of the two images; deduction means that corresponding pixel points of the aligned original DDM image and the reconstructed DDM image are subtracted.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or system comprising the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third and the like do not denote any order, but rather the words first, second and the like may be interpreted as indicating any order.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A GNSS-R receiver dual antenna signal co-correlation processing system, comprising: the system comprises an upper view antenna, a direct signal radio frequency front end, a direct signal processing unit, a code generator, an auxiliary information generating unit, a direct leakage interference signal reconstruction unit, a lower view antenna, a reflected signal radio frequency front end and a reflected signal processing unit;
the upper viewing antenna, the direct signal radio frequency front end and the direct signal processing unit are sequentially connected, and the output of the direct signal processing unit is respectively connected to the code generator and the auxiliary information generating unit;
the outputs of the code generator and the auxiliary information generating unit are used as inputs and are connected to the direct leakage interference signal reconstruction unit;
the downward-looking antenna, the reflected signal radio-frequency front end and the reflected signal processing unit are sequentially connected, and the code generator and the direct leakage interference signal reconstruction unit are connected with the reflected signal processing unit in output;
the direct-projection GNSS signal is received by the upper-view antenna and transmitted to the direct-projection signal radio frequency front end, the direct-projection signal radio frequency front end carries out down-conversion and sampling on the direct-projection GNSS signal and outputs a digital intermediate-frequency signal to the direct-projection signal processing unit, the direct-projection signal processing unit processes the digital intermediate-frequency signal and adjusts the code generator according to the output result of the direct-projection signal processing unit, and the auxiliary information generating unit extracts auxiliary information comprising a code phase, doppler and a direct-projection signal carrier-to-noise ratio by using the output result of the direct-projection signal processing unit;
the direct leakage interference related peak reconstruction unit reconstructs DDM caused by interference by using the result and auxiliary information output by the code generator to generate reconstructed DDM;
the downward-looking antenna receives the reflected signal, after the reflected signal is processed by the radio frequency front end, the reflected signal is correlated with the result output by the code generator to generate an original DDM, the reconstructed DDM is deducted from the original DDM, and the final high-quality DDM is output.
2. The GNSS-R receiver dual-antenna signal decorrelation processing system according to claim 1, wherein the direct signal processing unit includes a correlator and a carrier generator;
the carrier generator generates a carrier, the carrier is multiplied by a digital intermediate frequency signal output by the radio frequency front end of the direct signal to generate a baseband signal, the baseband signal is multiplied by a pseudo code generated by the code generator to generate three paths of correlation signals of morning, noon and evening, and the correlation signals are transmitted to the correlator;
the output of the correlator is processed by utilizing a carrier tracking algorithm, a carrier generator is further adjusted, and carrier information is transmitted to an auxiliary information generating unit;
processing the output of the correlator by using a code tracking algorithm, further adjusting a code generator, and transmitting code information to an auxiliary information generating unit;
the code generator generates code phase information according to a code tracking algorithm;
an auxiliary information generating unit generates auxiliary information including code phase, doppler, direct signal carrier-to-noise ratio, using the carrier information, the code information, and the output of the correlator.
3. A GNSS-R receiver double-antenna signal collaborative correlation processing method is characterized by comprising the following steps:
s1: the direct-projection GNSS signal is received by the upper-view antenna and transmitted to the direct-projection signal radio frequency front end, the direct-projection signal radio frequency front end carries out down-conversion and sampling on the direct-projection GNSS signal and outputs a digital intermediate-frequency signal to the direct-projection signal processing unit, the direct-projection signal processing unit processes the digital intermediate-frequency signal and adjusts the code generator according to the output result of the direct-projection signal processing unit, and the auxiliary information generating unit extracts auxiliary information comprising a code phase, doppler and a direct-projection signal carrier-to-noise ratio by using the output result of the direct-projection signal processing unit;
s2: the direct leakage interference correlation peak reconstruction unit reconstructs the DDM caused by the interference by using the result and the auxiliary information output by the code generator to generate a reconstructed DDM;
s3: the downward-looking antenna receives the reflected signal, generates an original DDM by correlating with a result output by the code generator after the reflected signal is processed by the radio frequency front end of the reflected signal, deducts the reconstructed DDM from the original DDM, and outputs the final high-quality DDM.
4. The GNSS-R receiver dual-antenna signal co-correlation processing method according to claim 3, wherein the step S1 comprises:
s1.1: the direct-view antenna receives direct GNSS signals and transmits the direct-view GNSS signals to the direct-view signal radio frequency front end, and the direct-view signal radio frequency front end performs down-conversion and sampling on the direct-view GNSS signals and outputs digital intermediate frequency signals to the direct-view signal processing unit;
s1.2: a carrier generator in the direct-injection signal processing unit generates a carrier, the carrier is multiplied by a digital intermediate frequency signal to generate a baseband signal, the baseband signal is multiplied by a pseudo code generated by a code generator to generate three paths of correlation signals of early, middle and late, and the correlation signals are transmitted to a correlator;
s1.3: the direct signal processing unit processes the output of the correlator by utilizing a carrier tracking algorithm, further adjusts a carrier generator and transmits carrier information to the auxiliary information generating unit;
s1.4: the direct signal processing unit processes the output of the correlator by using a code tracking algorithm, further adjusts the code generator and transmits code information to the auxiliary information generating unit;
s1.5: the code generator generates code phase information according to a code tracking algorithm;
s1.6: the side information generating unit generates side information using the carrier information, the code information, and the output of the correlator.
5. The GNSS-R receiver dual-antenna signal co-correlation processing method according to claim 3, wherein the step S2 comprises:
s2.1: the direct leakage interference correlation peak reconstruction unit estimates the carrier-to-noise ratio of direct leakage interference by utilizing the carrier-to-noise ratio of a direct signal based on the calibration gain difference of the top-view antenna and the bottom-view antenna;
s2.2: according to carrier-to-noise ratio estimation information of direct leakage interference, a direct leakage interference related peak reconstruction unit expands a code phase near Doppler to generate a time-frequency two-dimensional signal, and performs related integration on the code phase information output by a code generator and the time-frequency two-dimensional signal;
s2.3: and the direct leakage interference correlation peak reconstruction unit performs phase adjustment on the result of the correlation integral output according to the code phase and the interval size of Doppler expansion, further generates a leakage interference correlation peak and outputs a reconstructed DDM.
6. The GNSS-R receiver dual-antenna signal co-correlation processing method according to claim 3, wherein the step S3 comprises:
s3.1: the reflected signal processing unit performs correlation operation by using a digital intermediate frequency signal output by a radio frequency front end of the reflected signal and code phase information generated by a code generator to obtain an original DDM;
s3.2: and the reflected signal processing unit performs matching detection on the reconstructed DDM generated by the direct-radiation leakage interference correlation peak reconstruction unit in the original DDM, subtracts the detected leakage interference, and obtains and outputs the final high-quality DDM.
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