Method and device for determining moon gravity field by using inter-satellite frequency signal time-frequency link

Abstract

The invention relates to a method and device for determining a lunar gravity field by using an inter-satellite frequency signal time-frequency link, and the method comprises the steps: connecting an earth observation station, a static satellite and a lunar polar orbit satellite which are provided with an atomic clock through a satellite carrying a clock system based on a generalized relativistic theory, and carrying out the time-frequency transmission through a satellite time-frequency transmission method, the gravity potential difference between the earth and the satellite and the gravity potential difference between the satellite and the moon polar orbit satellite are measured through a gravity frequency shift method, the gravity potential data of the moon polar orbit satellite are obtained through an inter-satellite time-frequency link according to the earth gravity potential data, and then the moon gravity field is determined through a physical geodetic measurement method. Therefore, the problems that the prior art is difficult to implement on the surface of the moon and the gravity potential of the moon and the earth cannot be connected are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gravity measurement, and in particular to a method and device for determining a lunar gravity field using inter-satellite frequency signal time-frequency links. BACKGROUND

[0002] The importance of studying the lunar gravity field in science and exploration cannot be ignored. By accurately measuring the gravity data on the lunar surface, scientists can infer the density distribution and geological structure of the lunar interior, which is of key significance to revealing the formation history of the Moon and comparing it with the Earth and other celestial bodies. In addition, lunar gravity field data also provides an important basis for future landing and exploration missions, helping to determine the safety of landing sites and resource distribution, thereby promoting human ability to further explore space.

[0003] However, existing methods for measuring the lunar surface gravity potential mainly rely on the combination of leveling and gravity measurement. Although this method has high accuracy, it is limited by the accessibility and coverage of geographical locations, making it difficult to implement on the lunar surface and unable to connect the gravity potential of the Moon with that of the Earth, which needs to be addressed urgently. SUMMARY

[0004] The present application provides a method and device for determining a lunar gravity field using inter-satellite frequency signal time-frequency links to solve the problem that existing technology cannot be implemented on the lunar surface and cannot connect the gravity potential of the Moon with that of the Earth.

[0005] The first aspect of the present application provides a method for determining a lunar gravity field using inter-satellite frequency signal time-frequency links, comprising the following steps: determining the Earth gravity potential of a target Earth station, and establishing a geosynchronous time-frequency link and a lunar orbit satellite time-frequency link between the target Earth station and a target geostationary satellite station and a target lunar orbit satellite, respectively, to measure the geosynchronous gravity potential difference and the lunar orbit satellite gravity potential difference between the target geostationary satellite station and the target Earth station and the target lunar orbit satellite based on the Earth gravity potential, the geosynchronous time-frequency link and the lunar orbit satellite time-frequency link, respectively; determining the satellite gravity potential of the target geostationary satellite station, and calculating the lunar gravity potential of the target lunar orbit satellite according to the satellite gravity potential; based on a preset experimental duration, performing multiple lunar gravity potential calculation operations of the target lunar orbit satellite to cover the lunar surface and obtain the over-the-air gravity potential data at the target position above the Moon, and extrapolating the over-the-air gravity potential data to the lunar surface to obtain lunar gravity field data.

[0006] Optionally, in one embodiment of the present application, before determining the geopotential of the target Earth station and establishing the geosynchronous time-frequency link and the lunar-synchronous time-frequency link between the target Earth station and the target geosynchronous satellite station and the target lunar-synchronous satellite, respectively, it further comprises: selecting a signal transmitting and receiving device, a large-diameter communication antenna, and an atomic clock satisfying a preset accuracy requirement, and a geosynchronous satellite and a polar-orbit satellite located in a preset geosynchronous orbit and a preset lunar polar orbit, respectively, and determining the target geosynchronous satellite station and the target lunar-synchronous satellite through the geosynchronous satellite and the polar-orbit satellite; determining the target Earth station based on the atomic clock and a preset time-frequency transfer device, and calibrating the atomic clocks corresponding to the target geosynchronous satellite station, the target lunar-synchronous satellite, and the target Earth station, so that the target geosynchronous satellite station, the target lunar-synchronous satellite, and the target Earth station satisfy a preset clock synchronization requirement.

[0007] Optionally, in one embodiment of the present application, the determination of the geopotential of the target Earth station and the establishment of the geosynchronous time-frequency link and the lunar-synchronous time-frequency link between the target Earth station and the target geosynchronous satellite station and the target lunar-synchronous satellite, respectively, for measuring the geosynchronous geopotential difference and the lunar-synchronous geopotential difference between the target geosynchronous satellite station and the target Earth station and the target lunar-synchronous satellite based on the geopotential, the geosynchronous time-frequency link, and the lunar-synchronous time-frequency link, comprises: establishing the geosynchronous time-frequency link between the target Earth station and the target geosynchronous satellite station based on the time-frequency transfer device, and measuring the geosynchronous geopotential difference between the target Earth station and the target geosynchronous satellite station through a preset gravity frequency shift strategy; establishing and calibrating the lunar-synchronous time-frequency link between the target lunar-synchronous satellite and the target geosynchronous satellite station, and measuring the lunar-synchronous geopotential difference between the target lunar-synchronous satellite and the target geosynchronous satellite station according to the gravity frequency shift strategy.

[0008] Optionally, in one embodiment of the present application, the extrapolation of the upper-air geopotential data to the lunar surface to obtain the lunar gravity field data comprises: extrapolating the upper-air geopotential data based on a preset physical geodesy strategy to obtain the lunar surface gravity field data; and determining the lunar gravity field data according to the lunar surface gravity field data.

[0009] The second aspect embodiment of the present application provides a device for determining a lunar gravity field by using an inter-satellite frequency signal time-frequency link, comprising: a gravity difference calculation module, configured to determine an earth gravity potential of a target earth station, and establish a geosatellite time-frequency link and a moon-satellite time-frequency link between the target earth station and a target geosynchronous satellite station and a target lunar polar orbit satellite respectively, so as to determine a geosatellite gravity potential difference and a moon-satellite gravity potential difference between the target geosynchronous satellite station and the target earth station and the target lunar polar orbit satellite respectively based on the earth gravity potential, the geosatellite time-frequency link and the moon-satellite time-frequency link; a gravity potential calculation module, configured to determine a satellite gravity potential of the target geosynchronous satellite station, and calculate a lunar gravity potential of the target lunar polar orbit satellite according to the satellite gravity potential; and a gravity field determination module, configured to perform a plurality of lunar gravity potential calculation operations of the target lunar polar orbit satellite based on a preset experimental time length, so that the target lunar polar orbit satellite covers the lunar surface, and obtain an over-the-moon gravity potential data at a target position in the lunar space, and extrapolate the over-the-moon gravity potential data to the lunar surface to obtain lunar gravity field data.

[0010] Optionally, in one embodiment of the present application, further comprising: a selection module, configured to select a signal transmitting and receiving device, a large-diameter communication antenna and an atomic clock meeting a preset accuracy requirement before determining the earth gravity potential of the target earth station and establishing the geosatellite time-frequency link and the moon-satellite time-frequency link between the target earth station and the target geosynchronous satellite station and the target lunar polar orbit satellite respectively, and the geosynchronous satellite and the polar orbit satellite are located in a preset geosynchronous orbit and a preset lunar polar orbit respectively, and the target geosynchronous satellite station and the target lunar polar orbit satellite are determined by the geosynchronous satellite and the polar orbit satellite; and a calibration module, configured to determine the target earth station based on the atomic clock and a preset time-frequency transfer device, and calibrate atomic clocks corresponding to the target geosynchronous satellite station, the target lunar polar orbit satellite and the target earth station, so that the target geosynchronous satellite station, the target lunar polar orbit satellite and the target earth station meet a preset clock synchronization requirement.

[0011] Optionally, in one embodiment of the present application, the gravity difference calculation module comprises: a first establishment unit, configured to establish a geosatellite time-frequency link between the target earth station and the geosynchronous satellite station based on the time-frequency transfer device, and determine a geosatellite gravity potential difference between the target earth station and the geosynchronous satellite station by a preset gravity frequency shift strategy; and a second establishment unit, configured to establish and calibrate a moon-satellite time-frequency link between the target lunar polar orbit satellite and the geosynchronous satellite station, and determine a moon-satellite gravity potential difference between the target lunar polar orbit satellite and the geosynchronous satellite station according to the gravity frequency shift strategy.

[0012] Optionally, in an embodiment of the present application, the gravity field determination module comprises: a calculating unit configured to calculate the lunar surface gravity field data based on a preset physical geodetic strategy, and a determining unit configured to determine the lunar gravity field data according to the lunar surface gravity field data.

[0013] A third aspect of the embodiments of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link as described in the above embodiments.

[0014] A fourth aspect of the embodiments of the present application provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the method for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link as described above.

[0015] A fifth aspect of the embodiments of the present application provides a computer program product, comprising a computer program, and the computer program is executed to implement the method for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link as described above.

[0016] Therefore, the embodiments of the present application have the following beneficial effects:

[0017] The embodiments of the present application can determine the earth gravity potential of a target earth station, and respectively establish a geosynchronous satellite station and a target lunar polar orbit satellite between the target earth station and the target lunar polar orbit satellite, to measure the geosynchronous satellite station and the target earth station and the target lunar polar orbit satellite between the target lunar polar orbit satellite based on the earth gravity potential, the geosynchronous satellite station and the target earth station and the target lunar polar orbit satellite between the target lunar polar orbit satellite, and the satellite gravity potential of the target lunar polar orbit satellite is calculated according to the satellite gravity potential. Based on a preset experimental time length, the lunar gravity potential of the target lunar polar orbit satellite is calculated for multiple times, so that the target lunar polar orbit satellite covers the lunar surface, and the upper air gravity potential data at the target position on the moon is obtained, and the upper air gravity potential data is calculated to the lunar surface to obtain the lunar gravity field data. By using the time-frequency link between the geosynchronous satellite and the lunar polar orbit satellite and the gravity frequency shift method, the gravity field data of the lunar surface can be effectively measured and derived, which provides an important basis for understanding the differences between the moon, the earth and other planets. Therefore, the problem that the prior art cannot be implemented on the lunar surface and cannot connect the gravity potential between the moon and the earth is solved.

[0018] Additional aspects and advantages of the present application will be made apparent by the following description. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0020] Figure 1 A flow chart of a method for determining a lunar gravity field by using inter-satellite frequency signal time-frequency link according to an embodiment of the present application;

[0021] Figure 2 A principle schematic diagram of a method for determining a lunar gravity field by using inter-satellite frequency signal time-frequency link according to an embodiment of the present application;

[0022] Figure 3 An example diagram of a device for determining a lunar gravity field by using inter-satellite frequency signal time-frequency link according to an embodiment of the present application;

[0023] Figure 4 A structural schematic diagram of an electronic device according to an embodiment of the present application.

[0024] Wherein, 10 - a device for determining a lunar gravity field by using inter-satellite frequency signal time-frequency link; 100 - a gravity potential difference calculation module, 200 - a gravity potential calculation module, 300 - a gravity field determination module; 401 - a memory, 402 - a processor, 403 - a communication interface. DETAILED DESCRIPTION

[0025] Embodiments of the present application are described in detail below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, in which the same or similar components have the same or similar reference numerals throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0026] The following describes, with reference to the accompanying drawings, a method and apparatus for determining the lunar gravity field using an inter-satellite frequency signal time-frequency link according to an embodiment of the present application. In response to the problems mentioned in the above background technology, the present application provides a method for determining the lunar gravity field using an inter-satellite frequency signal time-frequency link. In this method, the Earth gravity potential of the target Earth station is determined, and a ground-satellite time-frequency link and a lunar-satellite time-frequency link are established between the target Earth station and the target geostationary satellite station and the target lunar polar-orbiting satellite, respectively. Based on the Earth gravity potential, the ground-satellite time-frequency link and the lunar-satellite time-frequency link, the ground-satellite gravity potential difference and the lunar-satellite gravity potential difference between the target geostationary satellite station and the target Earth station and the target lunar polar-orbiting satellite are respectively measured; the satellite gravity potential of the target geostationary satellite station is determined, and the lunar gravity potential of the target lunar polar-orbiting satellite is calculated based on the satellite gravity potential; based on a preset experiment duration, multiple lunar gravity potential calculation operations of the target lunar polar-orbiting satellite are performed so that the target lunar polar-orbiting satellite covers the lunar surface, and the overhead gravity potential data at the target position above the moon is obtained, and the overhead gravity potential data is extrapolated to the lunar surface to obtain lunar gravity field data. This application utilizes a time-frequency link between a geostationary satellite and a lunar polar-orbiting satellite, along with the gravity frequency shift method, to effectively measure and derive lunar surface gravity field data. This provides an important basis for understanding the differences between the Moon and Earth and other planets. This overcomes the existing difficulties of implementing existing technologies on the lunar surface and their inability to connect the lunar and Earth gravitational potentials.

[0027] In order to facilitate those skilled in the art to understand the execution logic of the method of determining the lunar gravity field using the inter-satellite frequency signal time-frequency link of the present application, the execution logic and related technical principles of the method of determining the lunar gravity field using the inter-satellite frequency signal time-frequency link of the present application are briefly explained and introduced below.

[0028] 1. Execution logic:

[0029] In recent years, with the rapid development of clock technology, a relativistic geodetic method based on general relativity has emerged. This method uses satellite technology to transmit time and frequency between two places, and realizes gravity potential measurement through the gravity frequency shift formula. It has been applied globally on the earth and can continuously observe the earth's gravity potential and provide high-precision data.

[0030] In order to expand the lunar gravity field measurement technology and lay the foundation for future lunar exploration, the method of determining the lunar gravity field using the inter-satellite frequency signal time-frequency link in this application can overcome the limitations of traditional methods through high-precision time and frequency transmission between geostationary satellites and lunar polar-orbiting satellites, and by establishing a time-frequency link between the earth-geostationary satellite-lunar polar-orbiting satellite and performing comparison, the gravity data of the lunar surface can be accurately obtained.

[0031] Specifically, the application can be equipped with high-precision atomic clocks and signal transmission systems on satellites, combined with precise clock comparison between satellites, by analyzing the clock rate difference between the Earth and the Moon, the gravity potential difference between the Earth and the Moon can be calculated, which can not only provide support for scientific research related to the Moon, such as understanding the internal structure of the Moon, monitoring lunar geological activity, lunar resource exploration, etc., but also can be widely used in astronomy, cosmology and other celestial body research, space navigation and positioning, etc. In addition, the application is also helpful to verify and expand the accuracy of general relativity in practical application, and provide new data support for basic scientific research.

[0032] 2. Key technical features:

[0033] (1) Geostationary satellite system: at least one satellite is located in the geostationary orbit (GEO) with an orbital height of about 35,000 kilometers. The satellite is equipped with high-precision atomic clocks, signal transmission and reception devices, and large-diameter communication antennas to ensure stable signal transmission and reception capabilities.

[0034] (2) Lunar polar orbit satellite system: at least one satellite is located in the lunar polar orbit with an orbital height of about 150 kilometers. The satellite is equipped with high-precision atomic clocks, signal transmission and reception devices, and large-diameter communication antennas to ensure stable signal transmission and reception capabilities.

[0035] (3) Atomic clock and time-frequency transfer technology: high-precision atomic clocks and related time-frequency transfer equipment are equipped on the satellite to provide stable frequency reference and ensure accurate time-frequency transfer between the Earth and the Moon.

[0036] (4) Earth stations: multiple time-frequency stations are set up on the Earth, each equipped with high-precision atomic clocks and time-frequency transfer equipment, to establish time-frequency connection with the geostationary satellite system and conduct clock rate comparison to determine the gravity potential data of the location of the geostationary satellite.

[0037] (5) General relativity gravity frequency shift method: according to the principle of gravity field affecting signal propagation described in general relativity, by measuring the clock rate change between the Earth-geostationary satellite and the geostationary satellite-lunar polar orbit satellite, the gravity field data of the lunar surface is derived.

[0038] (6) Physical geodetic survey method: based on the gravity data obtained by the lunar polar orbit satellite, the spherical harmonic function expansion and other physical geodetic survey methods are used to derive the gravity potential field distribution at different positions on the lunar surface. Based on the analysis of the spherical harmonic coefficients, a mathematical model is established to describe the lunar gravity field. This model can accurately reflect the gravity field strength, direction and change trend at different locations on the Moon.

[0039] Specifically, Figure 1A flowchart of a method for determining a lunar gravity field by using an inter-satellite frequency signal time-frequency link according to an embodiment of the present application.

[0040] As shown in the figure, the method for determining a lunar gravity field by using an inter-satellite frequency signal time-frequency link includes the following steps: Figure 1

[0041] In step S101, the gravity potential of a target Earth station is determined, and a geosatellite time-frequency link and a moon-satellite time-frequency link between the target Earth station and a target geostationary satellite station and a target lunar polar orbit satellite are respectively established, so as to determine a geosatellite gravity potential difference and a moon-satellite gravity potential difference between the target geostationary satellite station and the target Earth station and the target lunar polar orbit satellite based on the gravity potential, the geosatellite time-frequency link and the moon-satellite time-frequency link.

[0042] Firstly, the embodiment of the present application can ensure that all the clocks used have been calibrated before the experiment starts; secondly, as shown in the figure, the embodiment of the present application can determine the gravity potential of a point A of an Earth station (i.e. a target Earth station), establish a geosatellite time-frequency link between the Earth station A and a geostationary satellite station (i.e. a target geostationary satellite station) ES, and determine the geosatellite gravity potential difference between A and ES by using the gravity frequency shift method; at the same time, the embodiment of the present application also needs to establish a moon-satellite time-frequency link between a lunar polar orbit satellite (i.e. a target lunar polar orbit satellite) MS and the geostationary satellite station ES, and determine the moon-satellite gravity potential difference between ES and MS by using the gravity frequency shift method. Figure 2

[0043] Optionally, in an embodiment of the present application, before determining the gravity potential of a target Earth station and respectively establishing a geosatellite time-frequency link and a moon-satellite time-frequency link between the target Earth station and a target geostationary satellite station and a target lunar polar orbit satellite, it further includes: selecting a signal transmitting and receiving device, a large-diameter communication antenna and an atomic clock meeting a preset accuracy requirement, and a geostationary satellite and a polar orbit satellite respectively located in a preset geostationary orbit and a preset lunar polar orbit, and determining the target geostationary satellite station and the target lunar polar orbit satellite through the geostationary satellite and the polar orbit satellite; determining the target Earth station based on the atomic clock and a preset time-frequency transfer device, and calibrating the atomic clocks corresponding to the target geostationary satellite station, the target lunar polar orbit satellite and the target Earth station, so as to make the target geostationary satellite station, the target lunar polar orbit satellite and the target Earth station meet a preset clock synchronization requirement.

[0044] It should be noted that, before determining the gravity potential of a target Earth station and respectively establishing a geosatellite time-frequency link and a moon-satellite time-frequency link between the target Earth station and a target geostationary satellite station and a target lunar polar orbit satellite, the embodiment of the present application also needs to select and configure at least one geostationary satellite and lunar polar orbit satellite, and equip at least one Earth time-frequency station.

[0045] ​​The orbit height of the geostationary satellite is about 35000 kilometers, i.e. the orbit height of the geostationary satellite, the satellite is equipped with a signal transmitting device and a receiving device, and in view of the long distance between the satellite and the moon, the satellite is equipped with a large-diameter communication antenna, and the antenna radius is not less than 15 meters, so as to ensure the stable signal transmission and receiving capability; secondly, the geostationary satellite should be equipped with a high-precision atomic clock and its operating environment system, and the atomic clock provides a reference frequency for the signal transmitting and receiving system; in addition, the orbit parameters and the running speed of the geostationary satellite can be obtained by accurate measurement, and for this purpose, the geostationary satellite is equipped with an internal inertial measurement unit and a GNSS receiver to measure the position and speed of the satellite in real time.

[0046] The selection and configuration of the lunar polar orbit satellite should meet the following requirements:

[0047] 1. The orbit height of the lunar polar orbit satellite is about 150 kilometers;

[0048] 2. The orbit plane of the lunar polar orbit satellite is parallel to the polar axis of the moon, and the satellite will pass through the polar region of the moon every time it orbits the moon;

[0049] 3. The lunar polar orbit satellite is equipped with a signal transmitting device and a receiving device, and due to the long distance between the satellite and the earth, the satellite is equipped with a large-diameter communication antenna, and the antenna radius is not less than 15 meters;

[0050] 4. The satellite is equipped with a high-precision atomic clock and its operating environment system to provide a reference frequency for the signal transmitting and receiving system, and the time and frequency measurement system on the lunar polar orbit satellite should be consistent with that of the geostationary satellite as much as possible to reduce the error caused by the difference between the instruments;

[0051] 5. The orbit parameters and the running speed of the lunar polar orbit satellite need to be accurately measured; for this purpose, the lunar polar orbit satellite is equipped with an inertial navigation system, and the ground measurement and control system and the satellite-based navigation system are used to measure the speed and position of the satellite;

[0052] 6. In order to ensure that the trajectory of the polar orbit satellite can cover the surface of the moon, the experimental period needs to be more than one month.

[0053] Thirdly, the configuration requirements of the earth time and frequency measurement station equipped with a time and frequency measurement system in the embodiment of the application are as follows:

[0054] 1. Each system contains a high-precision atomic clock and related equipment;

[0055] 2. Each system contains a signal transceiver system for establishing a time and frequency link with the satellite, and in view of the long signal propagation distance, the system is equipped with a signal power amplifier and a large-diameter antenna;

[0056] 3. The instrument configuration of each time-frequency measurement system must be consistent to reduce errors caused by instrument differences;

[0057] 4. The Earth time and frequency observation station should be able to continuously observe geostationary satellites and maintain a time and frequency link with the satellites for time and frequency comparison.

[0058] It should be noted that the requirements for the atomic clocks configured at the above-mentioned stations are as follows:

[0059] 1. Use a hydrogen atomic clock, the frequency stability of which should be above 1×10^-16 / day and capable of continuous operation;

[0060] 2. Use an optical clock with a frequency stability of at least 1×10^-17 / day, and a continuous running time of at least three days at the start of each observation.

[0061] 3. Required supporting time-frequency signal transmission cables, power distributors, power amplifiers and other equipment;

[0062] 4. Configure the environmental operating system required by the atomic clock, with functions such as constant temperature, constant humidity and radiation shielding;

[0063] 5. The atomic clock must be calibrated before formal experiments.

[0064] In the embodiments of the present application, the time-frequency signal transceiver device configured in the above-mentioned corresponding time-frequency signal transceiver system should meet the following requirements:

[0065] 1. It has time and frequency comparison function, which is used to compare the time difference data and frequency difference data between the local signal and the received signal;

[0066] 2. Use atomic clocks as a reference for time and frequency signal comparison;

[0067] 3. The signal generator should be able to generate a stable signal in the frequency range of 10kHz to 10GHz, and the signal generator should use an atomic clock as the frequency reference;

[0068] 4. Equipped with data storage function and data processing related software;

[0069] 5. Equipped with spectrum analysis function, it is used to analyze the spectrum characteristics of the signal to help determine the harmonics, spurious and other characteristics of the signal, and perform detailed analysis of the frequency characteristics.

[0070] Therefore, the embodiment of the present application configures an earth station (i.e., station A) located on the earth and equipped with a high-precision atomic clock and time-frequency transmission equipment to establish a time-frequency connection with the geostationary satellite, and before the experiment, all clocks used are accurately calibrated to ensure the accuracy and synchronization of the clocks.

[0071] Optionally, in one embodiment of the present application, the Earth gravitational potential of the target Earth station is determined, and the Earth-satellite time-frequency link and the moon-satellite time-frequency link between the target Earth station and the target geostationary satellite station and the target lunar polar orbit satellite are established respectively to determine the Earth-satellite gravitational potential difference and the moon-satellite gravitational potential difference between the target geostationary satellite station and the target Earth station and the target lunar polar orbit satellite based on the Earth gravitational potential, the Earth-satellite time-frequency link and the moon-satellite time-frequency link, comprising: based on the time-frequency transfer device, establishing the Earth-satellite time-frequency link between the target Earth station and the geostationary satellite station, and determining the Earth-satellite gravitational potential difference between the target Earth station and the geostationary satellite station through a preset gravitational frequency shift strategy; establishing and calibrating the moon-satellite time-frequency link between the target lunar polar orbit satellite and the geostationary satellite station, and determining the moon-satellite gravitational potential difference between the target lunar polar orbit satellite and the geostationary satellite station according to the gravitational frequency shift strategy.

[0072] Specifically, as shown in the following figure, the process of determining the Earth-satellite time-frequency link, the moon-satellite time-frequency link, the Earth-satellite gravitational potential difference and the moon-satellite gravitational potential difference in the embodiment of the present application is as follows: Figure 2

[0073] (1) Gravitational potential determination of Earth station (i.e. target Earth station) A:

[0074] Determine the gravitational potential of the Earth station A point as the reference benchmark for subsequent measurement;

[0075] (2) Establish the Earth-satellite time-frequency link between the Earth station A and the geostationary satellite (i.e. target geostationary satellite station) ES:

[0076] Use accurate time-frequency measurement equipment to establish a stable time-frequency link between the Earth station A and the geostationary satellite ES;

[0077] (3) Gravitational frequency shift method to determine the gravitational potential difference between the Earth station A and the geostationary satellite ES:

[0078] Using the gravitational frequency shift method, the Earth-satellite gravitational potential difference between the Earth station A and the geostationary satellite station ES is derived by measuring the small change of clock frequency;

[0079] (4) Establish the moon-satellite time-frequency link between the lunar polar orbit satellite (i.e. target lunar polar orbit satellite) MS and the geostationary satellite ES:

[0080] Configure and calibrate the moon-satellite time-frequency link between the lunar polar orbit satellite MS and the geostationary satellite ES to ensure the stability and accuracy of data transmission and measurement.

[0081] (5) Gravitational frequency shift method to determine the gravitational potential difference between the geostationary satellite ES and the lunar polar orbit satellite MS:

[0082] Using the same gravitational frequency shift method, the moon-satellite gravitational potential difference between the geostationary satellite ES and the lunar polar orbit satellite MS is measured.​

[0083] Therefore, the embodiment of the present application provides reliable data support for deriving the lunar surface gravity field data through the time-frequency link between the geostationary satellite and the lunar satellite and calculating the corresponding gravity potential difference.

[0084] In step S102, the satellite gravity potential of the target geostationary satellite station is determined, and the lunar gravity potential of the target lunar polar orbit satellite is calculated according to the satellite gravity potential.

[0085] In step S103, the lunar gravity potential of the target lunar polar orbit satellite is calculated for multiple times based on a preset experimental duration, so that the target lunar polar orbit satellite covers the lunar surface, and the upper air gravity potential data at the target position in the lunar upper air is obtained, and the upper air gravity potential data is calculated to the lunar surface to obtain the lunar gravity field data.

[0086] Further, the embodiment of the present application can be connected through the satellite, and in the case that the gravity potential at the ES is known, the gravity potential information at any position in the lunar upper air at the MS is calculated, and the experiment for a preset experimental duration, such as about 1 month, is performed, so that the MS satellite can cover the entire lunar surface to obtain the gravity data at about 150 km in the lunar upper air.

[0087] Then, the embodiment of the present application can calculate the data in the lunar upper air to the lunar surface based on the physical geodetic method, so as to obtain the lunar surface gravity field data.

[0088] Therefore, the embodiment of the present application measures and derives the gravity field data of the lunar surface by using the time-frequency link between the geostationary satellite and the lunar polar orbit satellite through the gravity frequency shift method, so as to realize the high-precision measurement and analysis of the lunar gravity field, thereby not only being applicable to the moon, but also being extended to the gravity field research of other celestial bodies, and being helpful to reveal the research in the fields of celestial body internal structure, resource exploration and verification of general relativity.

[0089] Optionally, in an embodiment of the present application, the upper air gravity potential data is calculated to the lunar surface to obtain the lunar gravity field data, including: calculating the upper air gravity potential data based on a preset physical geodetic strategy to obtain the lunar surface gravity field data; and determining the lunar gravity field data according to the lunar surface gravity field data.

[0090] It should be noted that the embodiment of the present application can perform an experiment for about 1 month, so that the MS can cover the entire lunar surface, thereby obtaining the gravity data at about 150 km in the lunar upper air, and accurately measuring and comparing the clock rate difference between the earth, the satellite and the moon according to the physical geodetic method, that is, the data in the lunar upper air can be calculated to the lunar surface, and then the lunar surface gravity field data is obtained.

[0091] Specifically, the process of determining the lunar gravity field using the gravity data at the lunar polar orbit satellite is as follows:

[0092] 1. Based on the analysis of the gravity data obtained at the lunar polar orbit satellite, the spherical harmonic function expansion and other mathematical methods are used to derive the gravity potential field distribution at different positions on the lunar surface.

[0093] 2. Based on the spherical harmonic coefficients obtained by analysis, a mathematical model is established to describe the lunar gravity field. This model should accurately reflect the gravity field strength, direction and change trend at different locations on the moon.

[0094] 3. By comparing and verifying with ground observation data and other independent measurement results, the accuracy and applicability of the established lunar gravity field model are ensured, providing reliable gravity environment analysis support for lunar scientific research, resource exploration and future exploration missions.

[0095] Therefore, the embodiments of the present application can successfully obtain the gravity potential difference data between the Earth station A, the geostationary satellite ES and the lunar polar orbit satellite MS, and derive and establish the gravity field model at the lunar surface, providing important scientific basis and technical support for further exploration of the internal structure of the moon, evaluation of the safety of landing sites and distribution of resources.

[0096] It can be understood that the embodiments of the present application can effectively measure and derive the gravity field data on the lunar surface by using the time-frequency link between the geostationary satellite and the lunar polar orbit satellite and the gravity frequency shift method, which not only applies to the moon, but also provides a new high-precision measurement method for the gravity field research of other celestial bodies, which has important significance for revealing the internal structure of celestial bodies, resource exploration and verification of general relativity.

[0097] According to the method for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link, the earth gravity potential of the target earth station is determined, and the geosynchronous satellite-earth station time-frequency link and the lunar polar orbit satellite-earth station time-frequency link between the target earth station and the target geosynchronous satellite station and the target lunar polar orbit satellite are established respectively, so as to determine the geosynchronous satellite-earth station gravity potential difference and the lunar polar orbit satellite-earth station gravity potential difference between the target geosynchronous satellite station and the target earth station and the target lunar polar orbit satellite based on the earth gravity potential, the geosynchronous satellite-earth station time-frequency link and the lunar polar orbit satellite-earth station time-frequency link; the satellite gravity potential of the target geosynchronous satellite station is determined, and the lunar gravity potential of the target lunar polar orbit satellite is calculated according to the satellite gravity potential; the lunar gravity potential of the target lunar polar orbit satellite is calculated for multiple times based on a preset experimental time length, so that the target lunar polar orbit satellite covers the lunar surface, the over-the-air gravity potential data at the target position in the air above the moon is obtained, and the over-the-air gravity potential data is calculated to the lunar surface, so as to obtain the lunar gravity field data. According to the method for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link, the time-frequency link and the gravity frequency shift method between the geosynchronous satellite and the lunar polar orbit satellite can be used to effectively measure and deduce the gravity field data of the lunar surface, and provide an important basis for understanding the differences between the moon, the earth and other planets.

[0098] Secondly, the device for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link according to the embodiment of the application is described with reference to the accompanying drawings.

[0099] Figure 3 is a block schematic diagram of the device for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link according to the embodiment of the application.

[0100] As shown in Figure 3 , the device for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link 10 comprises a gravity potential difference calculation module 100, a gravity potential calculation module 200 and a gravity field determination module 300.

[0101] The gravity potential difference calculation module 100 is configured to determine the earth gravity potential of the target earth station, and establish the geosynchronous satellite-earth station time-frequency link and the lunar polar orbit satellite-earth station time-frequency link between the target earth station and the target geosynchronous satellite station and the target lunar polar orbit satellite respectively, so as to determine the geosynchronous satellite-earth station gravity potential difference and the lunar polar orbit satellite-earth station gravity potential difference between the target geosynchronous satellite station and the target earth station and the target lunar polar orbit satellite based on the earth gravity potential, the geosynchronous satellite-earth station time-frequency link and the lunar polar orbit satellite-earth station time-frequency link.

[0102] The gravity potential calculation module 200 is configured to determine the satellite gravity potential of the target geosynchronous satellite station, and calculate the lunar gravity potential of the target lunar polar orbit satellite according to the satellite gravity potential.

[0103] The gravity field measurement module 300 is configured to perform a plurality of lunar gravity potential calculation operations of the target lunar polar orbit satellite based on a preset experiment duration, so that the target lunar polar orbit satellite covers the lunar surface and obtains the upper air gravity potential data at the target position in the upper air of the moon, and the upper air gravity potential data is calculated to the lunar surface to obtain the lunar gravity field data.

[0104] Optionally, in an embodiment of the present application, the device 10 for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link further comprises a selection module and a calibration module.

[0105] The selection module is configured to select a signal transmitting and receiving device, a large-diameter communication antenna, and an atomic clock satisfying a preset accuracy requirement before determining the target earth station gravity potential and establishing the geosatellite time-frequency link and the moon-satellite time-frequency link between the target earth station and the target geostationary satellite station and the target lunar polar orbit satellite respectively, and the geostationary satellite and the polar orbit satellite are located in a preset geostationary orbit and a preset lunar polar orbit respectively, and the target geostationary satellite station and the target lunar polar orbit satellite are determined by the geostationary satellite and the polar orbit satellite.

[0106] The calibration module is configured to determine the target earth station based on the atomic clock and the preset time-frequency transfer device, and calibrate the atomic clocks corresponding to the target geostationary satellite station, the target lunar polar orbit satellite and the target earth station, so that the target geostationary satellite station, the target lunar polar orbit satellite and the target earth station satisfy a preset clock synchronization requirement.

[0107] Optionally, in an embodiment of the present application, the gravity potential difference calculation module 100 comprises a first establishment unit and a second establishment unit.

[0108] The first establishment unit is configured to establish the geosatellite time-frequency link between the target earth station and the geostationary satellite station based on the time-frequency transfer device, and measure the geosatellite gravity potential difference between the target earth station and the geostationary satellite station by a preset gravity frequency shift strategy.

[0109] The second establishment unit is configured to establish and calibrate the moon-satellite time-frequency link between the target lunar polar orbit satellite and the geostationary satellite station, and measure the moon-satellite gravity potential difference between the target lunar polar orbit satellite and the geostationary satellite station according to the gravity frequency shift strategy.

[0110] Optionally, in an embodiment of the present application, the gravity field measurement module 300 comprises a calculation unit and a determination unit.

[0111] The calculation unit is configured to calculate the upper air gravity potential data based on a preset physical geodetic survey strategy to obtain the lunar surface gravity field data.

[0112] The determination unit is configured to determine the lunar gravity field data according to the lunar surface gravity field data.

[0113] It should be noted that the foregoing explanation of the method embodiment for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link is also applicable to the device for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link of the embodiment, which will not be repeated here.

[0114] The device for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link according to the embodiment of the application comprises a gravity difference calculation module 100, which is configured to determine the earth gravity potential of a target earth station, and establish a geosynchronous satellite-earth station time-frequency link and a lunar polar orbit satellite-earth station time-frequency link between the target earth station and a target geosynchronous satellite station and a target lunar polar orbit satellite, respectively, to determine a geosynchronous satellite-earth station gravity potential difference and a lunar polar orbit satellite-earth station gravity potential difference between the target geosynchronous satellite station and the target earth station and the target lunar polar orbit satellite, respectively, based on the earth gravity potential, the geosynchronous satellite-earth station time-frequency link and the lunar polar orbit satellite-earth station time-frequency link; a gravity potential calculation module 200, which is configured to determine a satellite gravity potential of the target geosynchronous satellite station, and calculate a lunar gravity potential of the target lunar polar orbit satellite according to the satellite gravity potential; and a gravity field determination module 300, which is configured to perform a plurality of lunar gravity potential calculation operations of the target lunar polar orbit satellite based on a preset experimental time length, so that the target lunar polar orbit satellite covers the lunar surface, and the above-ground gravity potential data at a target position in the lunar space is obtained, and the above-ground gravity potential data is extrapolated to the lunar surface to obtain the lunar gravity field data. By using the time-frequency link between the geosynchronous satellite and the lunar polar orbit satellite and the gravity frequency shift method, the gravity field data of the lunar surface can be effectively measured and derived, which provides an important basis for understanding the differences between the moon and the earth and other planets.

[0115] Figure 4 The electronic device provided by the embodiment of the application has the structure shown in the structural schematic diagram of the electronic device. The electronic device can comprise:

[0116] The memory 401, the processor 402 and the computer program stored in the memory 401 and executable on the processor 402.

[0117] The processor 402 implements the method for determining the lunar gravity field by using the inter-satellite frequency signal time-frequency link provided in the above-described embodiments when executing the program.

[0118] Further, the electronic device further comprises:

[0119] The communication interface 403 is configured to communicate between the memory 401 and the processor 402.

[0120] The memory 401 is configured to store the computer program executable on the processor 402.

[0121] The memory 401 can comprise a high-speed RAM memory, and can also comprise a non-volatile memory, for example, at least one disk memory.

[0122] If the memory 401, the processor 402 and the communication interface 403 are implemented independently, the communication interface 403, the memory 401 and the processor 402 can be connected with each other through a bus and complete communication between each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 4 In the figure, only one thick line is used to represent the bus, but it does not mean that there is only one bus or only one type of bus.

[0123] Optionally, in a specific implementation, if the memory 401, the processor 402 and the communication interface 403 are integrated on a chip, the memory 401, the processor 402 and the communication interface 403 can complete communication between each other through an internal interface.

[0124] The processor 402 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement one or more embodiments of the present application.

[0125] The embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the method for determining a lunar gravity field by using an inter-satellite frequency signal time-frequency link.

[0126] The embodiment of the present application further provides a computer program product, which includes a computer program, and the computer program is executed to implement the method for determining a lunar gravity field by using an inter-satellite frequency signal time-frequency link.

[0127] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, the usage of "N" means at least two, for example, two, three or the like, unless explicitly stated otherwise.

[0128] Furthermore, the terms "first", "second", or the like, are used merely as a designation of certain elements or features of the application, and do not imply or connote relative importance or a specific order of precedence. Thus, features defined with "first", "second", etc. can include at least one of the features, either explicitly or implicitly.

[0129] Any process or method descriptions or blocks in flow charts or otherwise described herein represent embodiments of modules, segments, or portions of code which include one or more executable instructions for implementing specific logic functions or steps, and alternate implementations are possible. In some embodiments, the processes or methods described in flow charts or otherwise described herein are not necessarily performed in the order shown or discussed, including, for example, as performed by a computer processor. Alternate implementations can perform functions or steps described in different orders, including simultaneously or in reverse order.

[0130] The logic and / or steps represented in the flowcharts and / or described herein, for example, can be considered as a sequence of executable instructions stored in a computer readable medium, which can be executed by an instruction execution system, apparatus or device, such as a computer-based system, a processor-based system, or other system that can fetch the instructions from the instruction execution system, apparatus or device and execute the instructions, or a combination of them. For the purposes of this specification, a "computer readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus or device. The computer readable medium can be a computer readable storage medium or a computer readable signal medium. The computer readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a propagation medium. The computer readable signal medium can include, but is not limited to, a computer readable medium that facilitates transfer of the program from one place to another. A specific example of a computer readable medium is a non-transitory computer-readable storage medium. A specific example of a computer readable signal medium is a source or destination of the computer readable medium. Another specific example of a computer readable signal medium is a computer readable signal travelling through space. Thus, a computer readable medium can take many forms of hardware to carry out the program for use by or in connection with the instruction execution system, apparatus or device.

[0131] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, the N steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware and in another embodiment, the hardware can be implemented with any or a combination of the following technologies, which are all well known in the art: a discrete logic circuit(s) having logic gates for implementing logic functions upon an application of data signals, an application specific integrated circuit having appropriate combinational logic gates, a programmable gate array(s) (PGA), a field programmable gate array (FPGA), etc.

[0132] Those of skill in the art would understand that the steps carried out by the above-mentioned embodiments can be implemented by a program instructing the relevant hardware to complete all or part of the steps, and the program can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiments or a combination thereof.

[0133] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing module, or each of the units can be physically present separately, or two or more units can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0134] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for determining the lunar gravity field using an intersatellite frequency signal time-frequency link, characterized in that: The following steps are involved: determining an Earth gravity potential of a target Earth station, and establishing a Ground-Satellite time-frequency link and a Moon-Satellite time-frequency link between the target Earth station and a target Geostationary satellite station and a target lunar polar-orbiting satellite, respectively, so as to measure, based on the Earth gravity potential, the Ground-Satellite time-frequency link and the Moon-Satellite time-frequency link, the Ground-Satellite gravity potential difference and the Moon-Satellite gravity potential difference between the target Geostationary satellite station and the target Earth station and the target lunar polar-orbiting satellite, respectively; Determining the satellite gravity potential of the target geostationary satellite station, and calculating the lunar gravity potential of the target lunar polar-orbiting satellite based on the satellite gravity potential; Based on the preset experiment duration, the lunar gravity potential calculation operation of the target lunar polar orbit satellite is performed multiple times so that the target lunar polar orbit satellite covers the lunar surface, and the overhead gravity potential data at the target position above the moon is obtained, and the overhead gravity potential data is extrapolated to the lunar surface to obtain the lunar gravity field data.

2. The method according to claim 1, characterized in that Before determining the Earth's gravity potential of the target Earth station and establishing the Earth-satellite time-frequency link and the Moon-satellite time-frequency link between the target Earth station and the target geostationary satellite station and the target lunar polar-orbiting satellite, the method further includes: Selecting a geostationary satellite and a polar-orbiting satellite that are equipped with a signal transmitting and receiving device, a large-aperture communication antenna, and an atomic clock that meets preset accuracy requirements, and are located in a preset geostationary orbit and a preset lunar polar orbit, respectively, and determining the target geostationary satellite station and the target lunar polar-orbiting satellite through the geostationary satellite and the polar-orbiting satellite; Based on the atomic clock and the preset time-frequency transfer device, the target Earth station is determined, and the atomic clocks corresponding to the target geostationary satellite station, the target lunar polar-orbiting satellite, and the target Earth station are calibrated so that the target geostationary satellite station, the target lunar polar-orbiting satellite, and the target Earth station meet the preset clock synchronization requirements.

3. The method according to claim 2, characterized in that The determining of the Earth gravity potential of the target Earth station, and establishing a ground-satellite time-frequency link and a lunar-satellite time-frequency link between the target Earth station and a target geostationary satellite station and a target lunar polar-orbiting satellite, respectively, so as to respectively measure a ground-satellite gravity potential difference and a lunar-satellite gravity potential difference between the target geostationary satellite station and the target Earth station and the target lunar polar-orbiting satellite based on the Earth gravity potential, the ground-satellite time-frequency link and the lunar-satellite time-frequency link, comprises: Establishing a ground-to-satellite time-frequency link between the target Earth station and the geostationary satellite station based on the time-frequency transfer device, and measuring the ground-to-satellite gravity potential difference between the target Earth station and the geostationary satellite station using a preset gravity frequency shift strategy; A lunar-satellite time-frequency link is established and calibrated between the target lunar polar-orbiting satellite and the geostationary satellite station, and a lunar-satellite gravity potential difference between the target lunar polar-orbiting satellite and the geostationary satellite station is measured according to the gravity frequency shift strategy.

4. The method according to claim 1, wherein The step of extrapolating the upper-air gravity potential data to the lunar surface to obtain lunar gravity field data includes: Based on a preset physical geodetic strategy, the above-ground gravity potential data is extrapolated to obtain the lunar surface gravity field data; The lunar gravity field data is determined based on the lunar surface gravity field data.

5. A device for determining the lunar gravity field using an intersatellite frequency signal time-frequency link, characterized in that: include: a gravity potential difference calculation module, configured to determine the Earth gravity potential of a target Earth station, and establish a ground-satellite time-frequency link and a lunar-satellite time-frequency link between the target Earth station and a target geostationary satellite station and a target lunar polar-orbiting satellite, respectively, so as to measure the Earth-satellite gravity potential difference and the lunar-satellite gravity potential difference between the target geostationary satellite station and the target Earth station and the target lunar polar-orbiting satellite, respectively, based on the Earth gravity potential, the ground-satellite time-frequency link and the lunar-satellite time-frequency link; a gravity potential calculation module, configured to determine the satellite gravity potential of the target geostationary satellite station and calculate the lunar gravity potential of the target lunar polar-orbiting satellite based on the satellite gravity potential; The gravity field measurement module is used to perform multiple lunar gravity potential calculation operations of the target lunar polar-orbiting satellite based on a preset experiment duration, so that the target lunar polar-orbiting satellite covers the lunar surface, and obtains the upper gravity potential data at the target position above the moon, and extrapolates the upper gravity potential data to the lunar surface to obtain lunar gravity field data.

6. The device according to claim 5, characterized in that Also includes: a selection module for selecting, before determining the Earth's gravitational potential of the target Earth station and establishing the Earth-satellite time-frequency link and the Moon-satellite time-frequency link between the target Earth station and the target Geostationary satellite station and the target lunar polar-orbiting satellite, respectively, a Geostationary satellite and a polar-orbiting satellite equipped with a signal transmitting and receiving device, a large-aperture communication antenna, and an atomic clock meeting preset accuracy requirements, and located in a preset geostationary orbit and a preset lunar polar orbit, respectively, and determining the target Geostationary satellite station and the target lunar polar-orbiting satellite through the Geostationary satellite and the polar-orbiting satellite; a calibration module for determining the target Earth station based on the atomic clock and a preset time-frequency transfer device, and calibrating the atomic clocks corresponding to the target geostationary satellite station, the target lunar polar-orbiting satellite, and the target Earth station, so that the target geostationary satellite station, the target lunar polar-orbiting satellite, and the target Earth station meet preset clock synchronization requirements.

7. The device according to claim 6, characterized in that The gravity potential difference calculation module includes: a first establishing unit, configured to establish a ground-to-satellite time-frequency link between the target earth station and the geostationary satellite station based on the time-frequency transfer device, and to measure a ground-to-satellite gravity potential difference between the target earth station and the geostationary satellite station using a preset gravity frequency shift strategy; The second establishing unit is used to establish and calibrate the lunar-satellite time-frequency link between the target lunar polar-orbiting satellite and the geostationary satellite station, and to measure the lunar-satellite gravity potential difference between the target lunar polar-orbiting satellite and the geostationary satellite station according to the gravity frequency shift strategy.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for determining the lunar gravity field using an intersatellite frequency signal time-frequency link as described in any one of claims 1 to 4.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method for determining the lunar gravity field using an inter-satellite frequency signal time-frequency link as described in any one of claims 1 to 4.

10. A computer program product comprising a computer program, characterized in that The computer program is executed to implement the method for determining the lunar gravity field using an inter-satellite frequency signal time-frequency link as described in any one of claims 1 to 4.

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