CN115508867B - 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
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Abstract
The invention discloses a GNSS-R receiver double-antenna signal collaborative correlation processing system and a method, wherein the system utilizes GNSS direct-injection signals received by an upward-looking antenna to estimate specific parameters such as carrier-to-noise ratio, satellite Doppler information, code phase and the like of the signals, utilizes the specific parameters to reconstruct correlation peaks of direct-injection signal leakage interference, generates corresponding DDM images, is used for assisting correlation processes of reflected signals received by a downward-looking antenna and local codes, eliminates and reconstructs DDM in reflection correlation waveforms, thereby inhibiting direct-injection leakage interference, and finally improving the quality of output DDM.
Description
Technical Field
The invention belongs to the field of global navigation satellite systems (Global Navigation Satellite System, GNSS), and particularly relates to a GNSS-R receiver dual-antenna signal collaborative correlation processing system and method.
Background
The global navigation satellite system is a satellite-based radio positioning, navigation and time service system, and comprises a China Beidou system, an American global positioning system, european Galileo and Russian Galileo systems and the like. The GNSS-R technology utilizes the reflected signals of GNSS to detect the earth surface, and has wide application in aspects of sea surface wind speed detection, ground humidity sensing and the like.
The GNSS-R receiver often correlates the received reflected signals with the local signals to form a delay Doppler map (DelayDopplerMap, DDM), and processes the image to extract correlation eigenvalues to invert the characteristics of the desired perceived object. In a specific implementation, an antenna for receiving the reflected signal is often a left-hand circularly polarized antenna, so as to avoid the influence of the direct signal. However, since the reflection of the GNSS signal is weak, the reflection antenna of the GNSS-R receiver is easily subject 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 correlation peaks caused by the direct signal, which causes various problems in the process of processing the reflected signal, and affects the accuracy and stability of the system.
Therefore, the problems of low signal-to-noise ratio, limited coherent integration time, direct leakage interference and the like of the reflected signal in the GNSS-R receiver are technical problems to be solved.
Disclosure of Invention
Aiming at the technical problems of low signal-to-noise ratio and easy direct leakage interference of the reflected signals existing in the GNSS-R receiver, the method assisted by the normal-emission signals can be adopted for improvement. Based on the high consistency of direct signal and reflected signal parameters and the great difference of signal to noise ratio in the GNSS-R receiver, the estimation information of the direct signal is fully mined, the correlation processing of the reflected signal is assisted and enhanced, and direct leakage interference is eliminated by utilizing a correlation peak reconstruction mode, so that the output DDM quality is improved. Therefore, the invention provides a double-antenna signal cooperative correlation processing system and method for a GNSS-R receiver, which can effectively improve the DDM quality and reliability of the output of the GNSS-R receiver.
The idea of the invention is as follows:
the GNSS-R receiver double-antenna signal cooperative correlation processing system utilizes direct signals received by the upward-looking antenna to estimate specific parameters such as carrier-to-noise ratio, satellite Doppler information, code phase and the like of the signals, utilizes the specific parameters to reconstruct correlation peaks of direct signal leakage interference to generate corresponding DDM images, is used for assisting correlation processes of reflected signals received by the downward-looking antenna and local codes, eliminates reconstructed DDM in reflection correlation waveforms, suppresses direct leakage interference, and finally improves quality of output DDM.
The invention adopts the following technical scheme:
according to one aspect of the present invention, there is provided a dual-antenna signal cooperative correlation processing system of a GNSS-R receiver, comprising: the device comprises an upward-looking 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 downward-looking antenna, a reflected signal radio frequency front end and a reflected signal processing unit;
the upward-looking 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 connected to a direct leakage interference signal reconstructing unit;
the down-looking antenna, the reflected signal radio frequency front end and the reflected signal processing unit are sequentially connected, and the outputs of the code generator and the direct leakage interference signal reconstruction unit are connected to the reflected signal processing unit;
the upward-looking antenna receives the direct GNSS signals, transmits the direct GNSS signals to the direct signal radio frequency front end, and the direct signal radio frequency front end performs down-conversion and sampling on the direct GNSS signals and outputs digital intermediate frequency signals to the direct signal processing unit;
the direct leakage interference correlation peak reconstruction unit reconstructs the DDM caused by interference by utilizing the result and auxiliary information output by the code generator to generate a reconstructed DDM;
the down-looking antenna receives the reflected signal, and generates an original DDM by correlation with the result output by the code generator after the radio frequency front end processing 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 wave, multiplies the carrier wave by a digital intermediate frequency signal output by the radio frequency front end of the direct signal to generate a baseband signal, multiplies the baseband signal by a pseudo code generated by the code generator to generate three related signals of morning, evening and morning, and transmits the related signals to the correlator;
processing the output of the correlator by using a carrier tracking algorithm, further adjusting a carrier generator, and transmitting carrier information 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;
the auxiliary information generating unit generates auxiliary information including a code phase, doppler, and a 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 method for processing dual-antenna signal cooperative correlation of a GNSS-R receiver, comprising the steps of:
s1: the upward-looking antenna receives the direct GNSS signals, transmits the direct GNSS signals to the direct signal radio frequency front end, and the direct signal radio frequency front end performs down-conversion and sampling on the direct GNSS signals and outputs digital intermediate frequency signals to the direct signal processing unit;
s2: the direct leakage interference correlation peak reconstruction unit reconstructs the DDM caused by interference by utilizing the result and auxiliary information output by the code generator to generate a reconstructed DDM;
s3: the down-looking antenna receives the reflected signal, and generates an original DDM by correlation with the result output by the code generator after the radio frequency front end processing of the reflected signal, deducts the reconstructed DDM from the original DDM, and outputs the final high-quality DDM.
Preferably, step S1 comprises:
s1.1: the up-looking antenna receives the direct GNSS signals, transmits the direct GNSS signals to the direct signal radio frequency front end, and the direct signal radio frequency front end down-converts and samples the direct GNSS signals and outputs digital intermediate frequency signals to the direct signal processing unit;
s1.2: a carrier generator in the direct signal processing unit generates a carrier wave, multiplies the carrier wave by a digital intermediate frequency signal to generate a baseband signal, multiplies the baseband signal by a pseudo code generated by a code generator to generate three related signals of morning, evening and morning, and transmits the related signals 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 utilizing a code tracking algorithm, further adjusts a 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 auxiliary information generating unit generates auxiliary information using the carrier information, the code information, and the output of the correlator.
Preferably, step S2 includes:
s2.1: the direct leakage interference correlation peak reconstruction unit estimates the carrier-to-noise ratio of direct leakage interference by using the carrier-to-noise ratio of direct signal based on the calibration gain difference of the upper view antenna and the lower view antenna;
s2.2: according to the carrier-to-noise ratio estimation information of the direct leakage interference, a direct leakage interference correlation peak reconstruction unit spreads the code phase around Doppler to generate a time-frequency two-dimensional signal, and performs correlation integration with the time-frequency two-dimensional signal by utilizing the code phase information output by a code generator;
s2.3: and the direct leakage interference correlation peak reconstruction unit carries out phase adjustment on the result output by the correlation integration according to the code phase and the Doppler spread interval, so as to generate a leakage interference correlation peak and output a reconstructed DDM.
Preferably, step S3 includes:
s3.1: the reflected signal processing unit performs correlation operation by utilizing the 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;
s3.2: the reflection signal processing unit performs matching detection on the reconstructed DDM generated by the direct leakage interference correlation peak reconstruction unit in the original DDM, and deducts the detected leakage interference to obtain a final high-quality DDM image output.
The technical scheme provided by the invention has the beneficial effects that:
(1) The direct leakage interference correlation peak reconstruction utilizes tracking signals in direct signal processing, and the signal reconstruction precision is high;
(2) All operations are processed through digital signals, no extra hardware resource is added, and real-time processing can be realized;
(3) The direct signal is utilized to assist in improving the accuracy of the reflected signal, so that the integral 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 dual-antenna signal cooperative correlation processing system of a GNSS-R receiver according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a direct signal processing method in a dual-antenna signal cooperative correlation processing method of a GNSS-R receiver 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 collaborative correlation processing method according to an embodiment of the present invention;
fig. 4 is a flowchart of a reflected signal processing method in a dual-antenna signal cooperative correlation processing method of a GNSS-R receiver according to an embodiment of the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
Embodiment one:
referring to fig. 1, the present invention provides a dual-antenna signal cooperative correlation processing system of a GNSS-R receiver, including: the device comprises an upward-looking 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 downward-looking antenna, a reflected signal radio frequency front end and a reflected signal processing unit;
the upward-looking 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 connected to the direct leakage interference signal reconstructing unit;
the down-looking antenna, the reflected signal radio frequency front end and the reflected signal processing unit are sequentially connected, and the outputs of the code generator and the direct leakage interference signal reconstruction unit are connected to the reflected signal processing unit;
the upward-looking antenna receives the direct GNSS signals, transmits the direct GNSS signals to the direct signal radio frequency front end, and the direct signal radio frequency front end performs down-conversion and sampling on the direct GNSS signals and outputs digital intermediate frequency signals to the direct signal processing unit;
the direct leakage interference correlation peak reconstruction unit reconstructs the DDM caused by interference by utilizing the result and auxiliary information output by the code generator to generate a reconstructed DDM;
the down-looking antenna receives the reflected signal, and generates an original DDM by correlation with the result output by the code generator after the radio frequency front end processing 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 generator generates a carrier wave, multiplies the carrier wave by a digital intermediate frequency signal output by the radio frequency front end of the direct signal to generate a baseband signal, multiplies the baseband signal by a pseudo code generated by the code generator to generate three related signals of morning, evening and morning, and then transmits the related signals to the correlator;
processing the output of the correlator by using a carrier tracking algorithm, further adjusting a carrier generator, and transmitting carrier information 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;
the auxiliary information generating unit generates auxiliary information including a code phase, doppler, and a direct signal carrier-to-noise ratio using the carrier information, the code information, and the output of the correlator.
Embodiment two:
referring to fig. 2-4, the present embodiment provides a method for processing dual-antenna signal co-correlation of a GNSS-R receiver, which is implemented based on the dual-antenna signal co-correlation processing system of the GNSS-R receiver according to the first embodiment, and includes the following steps:
s1: the upward-looking antenna receives the direct GNSS signals, transmits the direct GNSS signals to the direct signal radio frequency front end, and the direct signal radio frequency front end performs down-conversion and sampling on the direct GNSS signals and outputs digital intermediate frequency signals to the direct signal processing unit;
s2: the direct leakage interference correlation peak reconstruction unit reconstructs the DDM caused by interference by utilizing the result and auxiliary information output by the code generator to generate a reconstructed DDM;
s3: the down-looking antenna receives the reflected signal, and generates an original DDM by correlation with the result output by the code generator after the radio frequency front end processing 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 up-looking antenna receives the direct GNSS signals, transmits the direct GNSS signals to the direct signal radio frequency front end, and the direct signal radio frequency front end down-converts and samples the direct GNSS signals and outputs digital intermediate frequency signals to the direct signal processing unit;
s1.2: a carrier generator in the direct signal processing unit generates a carrier wave, multiplies the carrier wave by a digital intermediate frequency signal to generate a baseband signal, multiplies the baseband signal by pseudo codes generated by a code generator to generate three related signals of early, middle and late (EPL), and transmits the three related signals 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 utilizing a code tracking algorithm, further adjusts a 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 auxiliary information generating unit generates auxiliary 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 procedure 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 using the carrier-to-noise ratio of direct signal based on the calibration gain difference of the upper view antenna and the lower view antenna; the formula is as follows:
CN 0 _interference＝CN 0 _signal-Gain
in the above, CN 0 Interferon represents the direct leakage interference carrier-to-noise ratio, CN 0 Signal represents the direct signal-to-carrier-noise ratio and Gain represents the calibration Gain difference.
S2.2: according to the carrier-to-noise ratio estimation information of the direct leakage interference, a direct leakage interference correlation peak reconstruction unit spreads the code phase around Doppler to generate a time-frequency two-dimensional signal, and performs correlation integration with the time-frequency two-dimensional signal by utilizing the code phase information output by a code generator; the operation formula is as follows:
in the above formula, Z (N) is a correlation integral output result, N is the number of discrete data points participating in correlation operation, x (k) is code phase information output by a code generator, y (k-N) is a signal obtained by spreading a code phase estimated by a direct signal on a certain doppler, N is a general code number in the communication field, 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 carries out phase adjustment on the result output by the correlation integration according to the code phase and the Doppler spread interval, so as to generate a leakage interference correlation peak and output a reconstructed DDM.
Wherein, the phase adjustment formula is as follows:
in the above formula, complex (Z) is the result after phase adjustment, A is the power of the result output by the correlation integration, 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 t is a universal code in the communication field.
As a preferred embodiment, referring to fig. 4, the reflected signal processing procedure corresponding to step S3 includes the following steps:
s3.1: the reflected signal processing unit performs correlation operation by utilizing the 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 formula, Z '(N) is a correlation operation output result, N is the number of discrete data points participating in the correlation operation, x' (k) is a code phase output by a code generator, y '(k-N) is a digital intermediate frequency signal of a reflected signal, N is a general code number in the communication field, and k in y' (k-N) represents that the digital signal is shifted by k times.
S3.2: the reflection 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 deducts the detected leakage interference to obtain a final high-quality DDM image output.
The matching detection means that the peak points of the original DDM image and the reconstructed DDM image are aligned, so that the two-dimensional coordinates of the two images are aligned; subtraction means that the aligned original DDM image is subtracted from the corresponding pixels of the two images of the reconstructed DDM image.
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 phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages 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 terms first, second, third, etc. do not denote any order, but rather the terms first, second, third, etc. are used to interpret the terms as labels.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (6)
1. A dual-antenna signal cooperative correlation processing system of a GNSS-R receiver, comprising: the device comprises an upward-looking 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 downward-looking antenna, a reflected signal radio frequency front end and a reflected signal processing unit;
the upward-looking 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 connected to a direct leakage interference signal reconstructing unit;
the down-looking antenna, the reflected signal radio frequency front end and the reflected signal processing unit are sequentially connected, and the outputs of the code generator and the direct leakage interference signal reconstruction unit are connected to the reflected signal processing unit;
the upward-looking antenna receives the direct GNSS signals, transmits the direct GNSS signals to the direct signal radio frequency front end, and the direct signal radio frequency front end performs down-conversion and sampling on the direct GNSS signals and outputs digital intermediate frequency signals to the direct signal processing unit;
the direct leakage interference correlation peak reconstruction unit reconstructs the DDM caused by interference by utilizing the result and auxiliary information output by the code generator to generate a reconstructed DDM;
the down-looking antenna receives the reflected signal, and generates an original DDM by correlation with the result output by the code generator after the radio frequency front end processing of the reflected signal, deducts the reconstructed DDM from the original DDM, and outputs the final high-quality DDM.
2. The GNSS-R receiver dual antenna signal co-correlation processing system of claim 1 wherein the direct signal processing unit includes a correlator and a carrier generator;
the carrier generator generates a carrier wave, multiplies the carrier wave by a digital intermediate frequency signal output by the radio frequency front end of the direct signal to generate a baseband signal, multiplies the baseband signal by a pseudo code generated by the code generator to generate three related signals of morning, evening and morning, and transmits the related signals to the correlator;
processing the output of the correlator by using a carrier tracking algorithm, further adjusting a carrier generator, and transmitting carrier information 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;
the auxiliary information generating unit generates auxiliary information including a code phase, doppler, and a direct signal carrier-to-noise ratio using the carrier information, the code information, and the output of the correlator.
3. The double-antenna signal cooperative correlation processing method of the GNSS-R receiver is characterized by comprising the following steps of:
s1: the upward-looking antenna receives the direct GNSS signals, transmits the direct GNSS signals to the direct signal radio frequency front end, and the direct signal radio frequency front end performs down-conversion and sampling on the direct GNSS signals and outputs digital intermediate frequency signals to the direct signal processing unit;
s2: the direct leakage interference correlation peak reconstruction unit reconstructs the DDM caused by interference by utilizing the result and auxiliary information output by the code generator to generate a reconstructed DDM;
s3: the down-looking antenna receives the reflected signal, and generates an original DDM by correlation with the result output by the code generator after the radio frequency front end processing of the reflected signal, deducts the reconstructed DDM from the original DDM, and outputs the final high-quality DDM.
4. The method for processing dual-antenna signal co-correlation of a GNSS-R receiver according to claim 3, wherein step S1 comprises:
s1.1: the up-looking antenna receives the direct GNSS signals, transmits the direct GNSS signals to the direct signal radio frequency front end, and the direct signal radio frequency front end down-converts and samples the direct GNSS signals and outputs digital intermediate frequency signals to the direct signal processing unit;
s1.2: a carrier generator in the direct signal processing unit generates a carrier wave, multiplies the carrier wave by a digital intermediate frequency signal to generate a baseband signal, multiplies the baseband signal by a pseudo code generated by a code generator to generate three related signals of morning, evening and morning, and transmits the related signals 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 utilizing a code tracking algorithm, further adjusts a 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 auxiliary information generating unit generates auxiliary information using the carrier information, the code information, and the output of the correlator.
5. The method for processing dual-antenna signal co-correlation of a GNSS-R receiver according to claim 3, wherein step S2 comprises:
s2.1: the direct leakage interference correlation peak reconstruction unit estimates the carrier-to-noise ratio of direct leakage interference by using the carrier-to-noise ratio of direct signal based on the calibration gain difference of the upper view antenna and the lower view antenna;
s2.2: according to the carrier-to-noise ratio estimation information of the direct leakage interference, a direct leakage interference correlation peak reconstruction unit spreads the code phase around Doppler to generate a time-frequency two-dimensional signal, and performs correlation integration with the time-frequency two-dimensional signal by utilizing the code phase information output by a code generator;
s2.3: and the direct leakage interference correlation peak reconstruction unit carries out phase adjustment on the result output by the correlation integration according to the code phase and the Doppler spread interval, so as to generate a leakage interference correlation peak and output a reconstructed DDM.
6. The method for processing dual-antenna signal co-correlation of a GNSS-R receiver according to claim 3, wherein step S3 comprises:
s3.1: the reflected signal processing unit performs correlation operation by utilizing the 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;
s3.2: the reflection signal processing unit performs matching detection on the reconstructed DDM generated by the direct leakage interference correlation peak reconstruction unit in the original DDM, deducts the detected leakage interference, and obtains and outputs the final high-quality DDM.
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