CN113031015A - Sea ice detection device and method based on GNSS-R carrier phase - Google Patents
Sea ice detection device and method based on GNSS-R carrier phase Download PDFInfo
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- CN113031015A CN113031015A CN202110243016.5A CN202110243016A CN113031015A CN 113031015 A CN113031015 A CN 113031015A CN 202110243016 A CN202110243016 A CN 202110243016A CN 113031015 A CN113031015 A CN 113031015A
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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
- G01S19/14—Receivers specially adapted for specific applications
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
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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
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/43—Determining position using carrier phase measurements, e.g. kinematic positioning; using long or short baseline interferometry
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Abstract
The invention relates to a sea ice detection device and method based on a GNSS-R carrier phase. The device includes: the system comprises a GNSS direct antenna, a GNSS reflected antenna, a navigation signal processing module, a sea ice detection module, a wireless transmission module, a wireless communication antenna and a protective case; a GNSS direct antenna receives a direct signal of a navigation satellite; the GNSS reflection antenna receives a reflection signal of the navigation satellite reflected by the sea surface; the navigation signal processing module is respectively connected with the GNSS direct antenna and the GNSS reflection antenna; the navigation signal processing module captures, tracks and positions the direct projection signal; the navigation signal processing module tracks the reflection signal in an open loop manner to obtain complex correlation values under different time delays; the sea ice detection module is connected with the navigation signal processing module; the sea ice detection module determines carrier phase information according to the complex correlation values under different time delays and carries out sea ice detection according to the carrier phase information; the invention can effectively improve the recognition rate of seawater and sea ice.
Description
Technical Field
The invention relates to the technical field of ocean monitoring, in particular to a sea ice detection device and method based on a GNSS-R carrier phase.
Background
The method for carrying out ocean remote sensing by utilizing GNSS reflected signals is one of novel technologies of satellite remote sensing technology, and has the advantages of multiple information sources, light weight, spread spectrum processing, wide application range and the like. The GNSS-R (Global Navigation Satellite System-Reflected) technology receives a GNSS direct signal and an echo signal scattered by a reflecting surface by adopting shore-based, airborne and no-load special receiving equipment, obtains the related power of the Reflected signal corresponding to a time delay Doppler unit in the reflecting surface by cooperation, and then obtains the physical parameter information of the scattering surface on the earth surface by a certain inversion method.
At present, the most widely applied sea ice detection means mainly include three types: visual, instrumental and telemetry methods; the visual observation method is to detect the sea ice by eyes, and the method can not continuously observe the sea ice for a long time in a large range; the sea ice is detected by a measuring tool and an instrument by the instrumental method, but the observed data range is smaller; the remote sensing method detects the sea ice by using a remote sensing means, and has higher cost.
Therefore, based on the above prior art, a new sea ice detection method is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a sea ice detection device and method based on a GNSS-R carrier phase, which can effectively improve the identification rate of sea water and sea ice.
In order to achieve the purpose, the invention provides the following scheme:
a GNSS-R carrier phase based sea ice detection apparatus comprising: the system comprises a GNSS direct antenna, a GNSS reflected antenna, a navigation signal processing module, a sea ice detection module, a wireless transmission module, a wireless communication antenna and a protective case;
the GNSS direct antenna is erected vertically to the direction of the zenith; the GNSS direct antenna is used for receiving direct signals of the navigation satellite;
the GNSS reflecting antenna is obliquely erected downwards towards the sea surface to be observed; the GNSS reflection antenna is used for receiving a reflection signal of the navigation satellite reflected by the sea surface;
the navigation signal processing module is respectively connected with the GNSS direct antenna and the GNSS reflection antenna; the navigation signal processing module is used for capturing, tracking and positioning the direct signal to obtain navigation information; the navigation signal processing module is also used for tracking the reflection signal in an open loop manner to obtain complex correlation values under different time delays; the navigation information includes: position data, time data, and an elevation and an azimuth of each visible navigation satellite;
the sea ice detection module is connected with the navigation signal processing module; the sea ice detection module is used for determining carrier phase information according to the complex correlation values under different time delays and carrying out sea ice detection according to the carrier phase information to obtain a detection result; the carrier phase information is related to sea ice;
the wireless transmission module is connected with the sea ice detection module; the wireless transmission module is used for transmitting the detection result to a remote server in a wireless communication mode;
the wireless communication antenna is connected with the wireless transmission module; the wireless communication antenna is used for providing the wireless transmission module with the receiving and sending of wireless signals;
the navigation signal processing module, the sea ice detection module and the wireless transmission module are arranged in the protective case.
Optionally, the navigation signal processing module includes: a radio frequency front end and a baseband processing unit;
the radio frequency front end is respectively connected with the GNSS direct antenna and the GNSS reflection antenna; the radio frequency front end is used for sampling and quantizing the direct signal and the reflected signal to obtain a digital intermediate frequency signal; the digital intermediate frequency signals comprise direct intermediate frequency signals and reflected intermediate frequency signals;
the baseband processing unit is a mixed architecture of a DSP and an FPGA and is connected with the radio frequency front end; the baseband processing unit is used for capturing, tracking and positioning the direct injection intermediate frequency signal to obtain navigation information and obtain navigation information; and the reflected intermediate frequency signal and the local multipath replica signal are operated to obtain complex correlation values under different time delays.
Optionally, the baseband processing unit includes: an FPGA processor and a DSP processor;
the FPGA processor is connected with the radio frequency front end; the FPGA processor is used for finishing the generation of a local carrier and a PRN code and calculating the digital intermediate frequency signal;
the DSP processor is respectively connected with the radio frequency front end and the FPGA processor; the DSP processor is used for completing the direct injection intermediate frequency signal capturing, tracking and loop judgment, controlling the generation of local carrier waves and pseudo codes in the FPGA processor, extracting navigation messages for positioning calculation and configuring a reflection channel.
Optionally, the FPGA processor includes: the latch subunit and the relay subunit;
the latch subunit is connected with the radio frequency front end; the latch subunit is used for caching and recoding the digital intermediate frequency signal and respectively inputting the recoded direct signal and the recoded reflection signal into the direct channel and the reflection channel;
and the interruption subunit generates an integral zero clearing signal of 1ms in a counter mode, and is used for accumulating results in the direct injection channel and the reflection channel to obtain an updated signal, and then the updated signal is input into the DSP through the GPIO interface, so that an interruption program of the DSP is activated, and channel state updating operation is executed.
Optionally, the direct-injection channel generates two local carriers with a phase difference of 90 ° by using a direct digital frequency synthesis method, and mixes the two local carriers with the direct-injection intermediate-frequency signal to obtain two signals in the same direction and in an orthogonal direction.
Optionally, the reflection channel performs carrier stripping on the reflected intermediate frequency signal to generate a time delay PRN code, and obtains complex correlation values under different time delays.
Optionally, the GNSS direct antenna is a right-hand circularly polarized antenna.
Optionally, the GNSS reflection antenna is a left-handed circularly polarized antenna.
A sea ice detection method based on GNSS-R carrier phase is applied to the sea ice detection device based on GNSS-R carrier phase; the method comprises the following steps:
acquiring a direct signal of a navigation satellite and a reflected signal of the navigation satellite reflected by the sea surface;
sampling and quantizing the direct signals and the reflected signals by using a radio frequency front end to obtain digital intermediate frequency signals; the digital intermediate frequency signals comprise direct intermediate frequency signals and reflected intermediate frequency signals;
capturing, tracking and positioning the direct injection intermediate frequency signal to obtain navigation information and obtain navigation information; the navigation information includes: position data, time data, and an elevation and an azimuth of each visible navigation satellite;
directly introducing the navigation information into a carrier and a code generated in a direct-projection channel to realize direct-projection signal multiplexing;
the reflection channel obtains a chip delay control clock through a frequency multiplier to obtain signals with different code time delays, and carries out carrier stripping and pseudo-random code correlation with the intermediate frequency signals of the reflection channel to obtain complex correlation values under different time delays;
and determining carrier phase information according to the complex correlation values under different time delays, and performing sea ice detection according to the carrier phase information to obtain a detection result.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the sea ice detection device and method based on the GNSS-R carrier phase, the direct signals of the navigation satellites and the reflection signals of the navigation satellites reflected by the sea surface are correspondingly received through the GNSS direct antenna and the GNSS reflection antenna, namely, the collected GNSS navigation satellite signal sources are rich, a transmitter is not needed, the equipment size is small, the manufacturing cost is low, and the unmanned aerial vehicle carrying is facilitated; the sea surface type is identified by utilizing the phase difference of sea ice and sea water reflected signals, and compared with a traditional direct-reverse power ratio identification method, the method has low requirement on the performance of a radio frequency front end; the sea ice detection module determines carrier phase information according to the complex correlation values under different time delays, and carries out sea ice detection according to the carrier phase information to obtain a detection result, namely the sea ice and the sea ice are distinguished based on the GNSS-R carrier phase.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a GNSS-R carrier phase based sea ice detection apparatus according to the present invention;
FIG. 2 is a schematic diagram of an FPGA processor according to the present invention;
fig. 3 is a schematic flow chart of a method for detecting sea ice based on GNSS-R carrier phase according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a sea ice detection device and method based on a GNSS-R carrier phase, which can effectively improve the identification rate of sea water and sea ice.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a GNSS-R carrier phase-based sea ice detection apparatus according to the present invention, and as shown in fig. 1, the GNSS-R carrier phase-based sea ice detection apparatus according to the present invention includes: the device comprises a GNSS direct antenna 1, a GNSS reflection antenna 2, a navigation signal processing module 3, a sea ice detection module 4, a wireless transmission module 5, a wireless communication antenna 6 and a protective case 7.
The GNSS direct antenna 1 is erected vertically to the direction of the zenith; the GNSS direct antenna 1 is configured to receive direct signals from navigation satellites. Specifically, the GNSS direct antenna 1 is a right-hand circularly polarized antenna.
The GNSS reflecting antenna 2 is obliquely erected downwards towards the sea surface to be observed; the GNSS reflection antenna 2 is used for receiving a reflection signal of a navigation satellite reflected by the sea surface; the specific GNSS reflection antenna 2 is a left-handed circularly polarized antenna.
The navigation signal processing module 3 is respectively connected with the GNSS direct antenna 1 and the GNSS reflecting antenna 2; the navigation signal processing module 3 is used for capturing, tracking and positioning the direct signal to obtain navigation information; the navigation signal processing module 3 is further configured to track the reflection signal in an open loop manner to obtain complex correlation values under different time delays; the navigation information includes: position data, time data, and an elevation and an azimuth of each visible navigation satellite;
the sea ice detection module 4 is connected with the navigation signal processing module 3; the sea ice detection module 4 is configured to determine carrier phase information according to the complex correlation values under different time delays, and perform sea ice detection according to the carrier phase information to obtain a detection result; the carrier phase information is related to sea ice;
the wireless transmission module 5 is connected with the sea ice detection module 4; the wireless transmission module 5 is used for transmitting the detection result to a remote server in a wireless communication manner;
the wireless communication antenna 6 is connected with the wireless transmission module 5; the wireless communication antenna 6 is used for providing the wireless transmission module 5 with the receiving and sending of wireless signals;
the navigation signal processing module 3, the sea ice detection module 4 and the wireless transmission module 5 are arranged in the protective case 7.
The protective case 7 has power management and protection functions, is used for providing power for the operation of the signal processing module, the sea surface storm wave detection module and the wireless transmission module 5, and enables the terminal to have certain wind resistance, water resistance and dust resistance.
The navigation signal processing module 3 includes: a radio frequency front end and a baseband processing unit.
The radio frequency front end is respectively connected with the GNSS direct antenna 1 and the GNSS reflection antenna 2; the radio frequency front end is used for sampling and quantizing the direct signal and the reflected signal to obtain a digital intermediate frequency signal; the digital intermediate frequency signals comprise direct intermediate frequency signals and reflected intermediate frequency signals; specifically, the radio frequency front end is a four-channel radio frequency front end, and the signals are sampled and quantized to obtain 16.368MHz sampled and 2bit quantized digital intermediate frequency signals.
The baseband processing unit is a mixed architecture of a DSP and an FPGA and is connected with the radio frequency front end; the baseband processing unit is used for capturing, tracking and positioning the direct injection intermediate frequency signal to obtain navigation information and obtain navigation information; and the reflected intermediate frequency signal and the local multipath replica signal are operated to obtain complex correlation values under different time delays.
The baseband processing unit includes: an FPGA processor and a DSP processor.
The FPGA processor is connected with the radio frequency front end; the FPGA processor is used for finishing the generation of a local carrier and a PRN code and calculating the digital intermediate frequency signal;
the DSP processor is respectively connected with the radio frequency front end and the FPGA processor; the DSP processor is used for completing the direct injection intermediate frequency signal capturing, tracking and loop judgment, controlling the generation of local carrier waves and pseudo codes in the FPGA processor, extracting navigation messages for positioning calculation and configuring a reflection channel.
Fig. 2 is a schematic structural diagram of an FPGA processor provided in the present invention, and as shown in fig. 2, the FPGA processor includes: the latch subunit and the relay subunit.
The latch subunit is connected with the radio frequency front end; the latch subunit is used for caching and recoding the digital intermediate frequency signal and respectively inputting the recoded direct signal and the recoded reflection signal into the direct channel and the reflection channel.
And the interruption subunit generates an integral zero clearing signal of 1ms in a counter mode, and is used for accumulating results in the direct injection channel and the reflection channel to obtain an updated signal, and then the updated signal is input into the DSP through the GPIO interface, so that an interruption program of the DSP is activated, and channel state updating operation is executed.
The FPGA firstly buffers and recodes the digital intermediate frequency signal by the latch module, and expands the 2-bit direct and reflected signals into 3-bit signals, namely { -3, -1, +3 }. The direct signal after re-encoding and the reflected signal after re-encoding are respectively input to the direct channel and the reflected channel for subsequent correlation operation.
The direct-injection channel generates two paths of local carriers with 90-degree phase difference by adopting a direct digital frequency synthesis mode, and the local carriers and the direct-injection intermediate-frequency signals are mixed to obtain two paths of signals in the same direction and in an orthogonal direction.
At the same time, three local PRN codes of E (leading), P (immediate) and L (lagging) with the interval of 0.5 chip are generated by a shift register and a delayer, and are respectively subjected to 1ms correlation accumulation operation with direct I, Q signals, and the operation result is output to the DSP through an EMIF interface. And a carrier ring and a code ring in the DSP return control words according to the calculation result, and adjust the carrier and the pseudo code generated by the direct-emitting channel to make the carrier and the pseudo code consistent with the received signal, thereby realizing the capture and tracking of the direct-emitting signal.
And the reflection channel carries out carrier stripping on the reflection intermediate frequency signal to generate a time delay PRN code and obtain complex correlation values under different time delays. Specifically, unlike the direct path, the reflection path does not include a local carrier and code generation module, but directly introduces the carrier and code generated in the direct path corresponding thereto in a dynamic allocation manner, thereby realizing signal multiplexing. Since the inversion system designed by the present subject is mainly directed to shore-based applications, the doppler shift between the reflected signal and the direct signal can be ignored. The reflection channel obtains a chip delay control clock through a frequency multiplier to obtain 20 paths of time delay PRN codes with 0.25 chip interval, wherein the range is-2-3 chips. The delay range and resolution are sufficient to meet inversion requirements. The correlation operation process of each branch is the same as that of the direct path, and finally 20 paths of delay correlation values are obtained, wherein the correlation time is 1 ms.
Fig. 3 is a schematic flow chart of a GNSS-R carrier phase-based sea ice detection method according to the present invention, and as shown in fig. 3, the GNSS-R carrier phase-based sea ice detection method according to the present invention is applied to the GNSS-R carrier phase-based sea ice detection apparatus; a sea ice detection method based on a GNSS-R carrier phase comprises the following steps:
s101, acquiring direct signals of a navigation satellite and reflected signals of the navigation satellite reflected by the sea surface;
s102, sampling and quantizing the direct signal and the reflected signal by using a radio frequency front end to obtain a digital intermediate frequency signal; the digital intermediate frequency signals comprise direct intermediate frequency signals and reflected intermediate frequency signals;
s103, capturing, tracking and positioning the direct injection intermediate frequency signal to obtain navigation information and obtain navigation information; the navigation information includes: position data, time data, and an elevation and an azimuth of each visible navigation satellite;
s104, directly introducing the navigation information into a carrier and a code generated in a direct-injection channel to realize direct-injection signal multiplexing;
and S105, the reflection channel obtains a chip delay control clock through a frequency multiplier to obtain signals with different code time delays, and the signals and the intermediate frequency signals of the reflection channel are subjected to carrier stripping and pseudo-random code correlation to obtain complex correlation values under different time delays.
Using formulas
Phase information of the reflected signal is calculated.
Wherein I (t) is the real part of the complex correlation value of the reflected signal; q (t) is the imaginary part of the complex correlation value of the reflected signal.
And S106, determining carrier phase information according to the complex correlation values under different time delays, and performing sea ice detection according to the carrier phase information to obtain a detection result.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A sea ice detection device based on GNSS-R carrier phase, characterized by comprising: the system comprises a GNSS direct antenna, a GNSS reflected antenna, a navigation signal processing module, a sea ice detection module, a wireless transmission module, a wireless communication antenna and a protective case;
the GNSS direct antenna is erected vertically to the direction of the zenith; the GNSS direct antenna is used for receiving direct signals of the navigation satellite;
the GNSS reflecting antenna is obliquely erected downwards towards the sea surface to be observed; the GNSS reflection antenna is used for receiving a reflection signal of the navigation satellite reflected by the sea surface;
the navigation signal processing module is respectively connected with the GNSS direct antenna and the GNSS reflection antenna; the navigation signal processing module is used for capturing, tracking and positioning the direct signal to obtain navigation information; the navigation signal processing module is also used for tracking the reflection signal in an open loop manner to obtain complex correlation values under different time delays; the navigation information includes: position data, time data, and an elevation and an azimuth of each visible navigation satellite;
the sea ice detection module is connected with the navigation signal processing module; the sea ice detection module is used for determining carrier phase information according to the complex correlation values under different time delays and carrying out sea ice detection according to the carrier phase information to obtain a detection result; the carrier phase information is related to sea ice;
the wireless transmission module is connected with the sea ice detection module; the wireless transmission module is used for transmitting the detection result to a remote server in a wireless communication mode;
the wireless communication antenna is connected with the wireless transmission module; the wireless communication antenna is used for providing the wireless transmission module with the receiving and sending of wireless signals;
the navigation signal processing module, the sea ice detection module and the wireless transmission module are arranged in the protective case.
2. The GNSS-R carrier phase based sea ice detection apparatus of claim 1, wherein the navigation signal processing module comprises: a radio frequency front end and a baseband processing unit;
the radio frequency front end is respectively connected with the GNSS direct antenna and the GNSS reflection antenna; the radio frequency front end is used for sampling and quantizing the direct signal and the reflected signal to obtain a digital intermediate frequency signal; the digital intermediate frequency signals comprise direct intermediate frequency signals and reflected intermediate frequency signals;
the baseband processing unit is a mixed architecture of a DSP and an FPGA and is connected with the radio frequency front end; the baseband processing unit is used for capturing, tracking and positioning the direct injection intermediate frequency signal to obtain navigation information and obtain navigation information; and the reflected intermediate frequency signal and the local multipath replica signal are operated to obtain complex correlation values under different time delays.
3. The GNSS-R carrier phase based sea ice detection apparatus of claim 2, wherein the baseband processing unit comprises: an FPGA processor and a DSP processor;
the FPGA processor is connected with the radio frequency front end; the FPGA processor is used for finishing the generation of a local carrier and a PRN code and calculating the digital intermediate frequency signal;
the DSP processor is respectively connected with the radio frequency front end and the FPGA processor; the DSP processor is used for completing the direct injection intermediate frequency signal capturing, tracking and loop judgment, controlling the generation of local carrier waves and pseudo codes in the FPGA processor, extracting navigation messages for positioning calculation and configuring a reflection channel.
4. The GNSS-R carrier phase based sea ice detection apparatus of claim 3, wherein the FPGA processor comprises: the latch subunit and the relay subunit;
the latch subunit is connected with the radio frequency front end; the latch subunit is used for caching and recoding the digital intermediate frequency signal and respectively inputting the recoded direct signal and the recoded reflection signal into the direct channel and the reflection channel;
and the interruption subunit generates an integral zero clearing signal of 1ms in a counter mode, and is used for accumulating results in the direct injection channel and the reflection channel to obtain an updated signal, and then the updated signal is input into the DSP through the GPIO interface, so that an interruption program of the DSP is activated, and channel state updating operation is executed.
5. The GNSS-R carrier phase based sea ice detection apparatus as claimed in claim 4, wherein the direct path generates two local carriers with 90 ° phase difference by direct digital frequency synthesis, and mixes the two local carriers with the direct intermediate frequency signal to obtain two signals in the same direction and in quadrature.
6. The GNSS-R carrier phase based sea ice detection apparatus of claim 4, wherein the reflection channel performs carrier stripping on the reflected intermediate frequency signal to generate a time-delayed PRN code, and obtains complex correlation values at different time delays.
7. The GNSS-R carrier phase based sea ice detection apparatus of claim 1, wherein the GNSS direct antenna is a right-hand circularly polarized antenna.
8. The GNSS-R carrier phase based sea ice detection apparatus of claim 1, wherein the GNSS reflecting antenna is a left-handed circularly polarized antenna.
9. A sea ice detection method based on GNSS-R carrier phase is applied to the sea ice detection device based on GNSS-R carrier phase according to any one of claims 1 to 8; it is characterized by comprising:
acquiring a direct signal of a navigation satellite and a reflected signal of the navigation satellite reflected by the sea surface;
sampling and quantizing the direct signals and the reflected signals by using a radio frequency front end to obtain digital intermediate frequency signals; the digital intermediate frequency signals comprise direct intermediate frequency signals and reflected intermediate frequency signals;
capturing, tracking and positioning the direct injection intermediate frequency signal to obtain navigation information and obtain navigation information; the navigation information includes: position data, time data, and an elevation and an azimuth of each visible navigation satellite;
directly introducing the navigation information into a carrier and a code generated in a direct-projection channel to realize direct-projection signal multiplexing;
the reflection channel obtains a chip delay control clock through a frequency multiplier to obtain signals with different code time delays, and carries out carrier stripping and pseudo-random code correlation with the intermediate frequency signals of the reflection channel to obtain complex correlation values under different time delays;
and determining carrier phase information according to the complex correlation values under different time delays, and performing sea ice detection according to the carrier phase information to obtain a detection result.
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| 金玲: "GNSS-R接收机及有效波高反演方法研究", 《中国优秀硕士学位论文全文数据库信息科技辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117607908A (en) * | 2024-01-23 | 2024-02-27 | 山东大学 | GNSS-R code phase sea surface height measurement method and device of unmanned aerial vehicle platform |
| CN117607908B (en) * | 2024-01-23 | 2024-04-05 | 山东大学 | GNSS-R code phase sea surface height measurement method and device of unmanned aerial vehicle platform |
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