CN112731398A - Multi-dimensional information detection SAR satellite detection method - Google Patents
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Abstract
The invention relates to a multi-dimensional information detection SAR satellite detection method, belonging to the field of microwave remote sensing satellite system design; step one, establishing an SAR satellite system, which comprises 1 main satellite and N auxiliary satellites; step two, the main satellite transmits a detection signal to a ground area to be detected, the ground area to be detected reflects the detection signal to form an imaging echo signal, and the auxiliary satellite receives the imaging echo signal and feeds the imaging echo signal back to the main satellite; imaging is realized; step three, 5 imaging modes are realized through the SAR satellite system, including a multi-band splicing imaging mode, a single-band three-dimensional imaging mode, a multi-band interference imaging mode, a multi-band multi-polarization imaging mode and a single-band multi-azimuth GMTI imaging mode; the invention realizes the rapid acquisition of multi-dimensional information such as space dimension, frequency dimension, polarization dimension, space dimension and the like of an observation area, improves the application efficiency of the satellite-borne SAR system and expands the application field of the system.
Description
Technical Field
The invention belongs to the field of microwave remote sensing satellite system design, and relates to a multi-dimensional information detection SAR satellite detection method.
Background
With the continuous improvement of richness, accuracy and timeliness of information acquisition in earth remote sensing applications, a satellite-borne Synthetic Aperture Radar (SAR) system is urgently needed to have the capability of quickly acquiring multidimensional (space dimension, frequency dimension, polarization dimension and time dimension) information.
The traditional SAR satellite system mainly aims at specific application requirements for system design, has a single working frequency band, is mainly used for acquiring a high-resolution wide-coverage two-dimensional SAR image, and cannot meet the application requirements for quickly acquiring multi-dimensional information. The method utilizes the SAR satellites which are in orbit or emit a plurality of different frequency bands, polarizations and functions, and utilizes the data acquired by multi-navigation to carry out combined processing, so that the multi-dimensional information acquisition can be realized to a certain extent, but the following four problems still exist: 1) the richness is insufficient, SAR satellites with different frequency bands and polarization modes are transmitted in part of the countries at present, but each satellite system is relatively independent, the obtained information is discrete and the richness is insufficient, and the combined application is difficult to realize; 2) the accuracy is poor, the performance of each satellite system is different, the ground feature scattering characteristics have time-varying property and space-varying property, and system errors exist when data acquired by multiple satellites or multiple voyages are subjected to combined processing, so that the accuracy of the acquired information is poor; 3) the timeliness is low, the target elevation, the three-dimensional information, the deformation information and the like can be obtained by jointly performing interference, three-dimensional imaging or differential tomography on the multiple SAR two-dimensional image data obtained through multiple passes, but the multiple SAR two-dimensional images need longer time to be obtained, so that the timeliness of information acquisition is influenced; 4) however, if a traditional SAR satellite system is adopted, the functions of the satellites are similar, each satellite system is complex and high in cost, the cost for launching a plurality of satellites to construct a constellation is high, and the economic utilization value is low.
In summary, the conventional SAR satellite system is difficult to meet the requirements of richness, accuracy and timeliness of information acquisition in earth remote sensing application at low cost, so innovative design is urgently needed from the aspect of system design, and the richness (multidimensional information such as space dimension, frequency dimension, polarization dimension, time dimension and the like) of information acquisition is ensured, and meanwhile, the high accuracy, good timeliness and low system cost of information are ensured.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method overcomes the defects of the prior art, provides a multi-dimensional information detection SAR satellite detection method, and realizes 5 imaging modes, including a multi-band splicing imaging mode, a single-band three-dimensional imaging mode, a multi-band interference imaging mode, a multi-band multi-polarization imaging mode and a single-band multi-azimuth GMTI imaging mode; the invention realizes the rapid acquisition of multi-dimensional information such as space dimension, frequency dimension, polarization dimension, space dimension and the like of an observation area, improves the application efficiency of the satellite-borne SAR system and expands the application field of the system.
The technical scheme of the invention is as follows:
a multi-dimensional information detection SAR satellite detection method comprises the following steps:
step one, establishing an SAR satellite system, which comprises 1 main satellite and N auxiliary satellites; n is a positive integer and is not less than 9;
step two, the main satellite transmits a detection signal to a ground area to be detected, the ground area to be detected reflects the detection signal to form an imaging echo signal, and the auxiliary satellite receives the imaging echo signal and feeds the imaging echo signal back to the main satellite; imaging is realized;
and step three, realizing 5 imaging modes through the SAR satellite system, wherein the imaging modes comprise a multi-band splicing imaging mode, a single-band three-dimensional imaging mode, a multi-band interference imaging mode, a multi-band multi-polarization imaging mode and a single-band multi-azimuth GMTI imaging mode.
In the above method for detecting a multi-dimensional information detection SAR satellite, in the first step, 1 primary satellite and N secondary satellites are located on an orbital plane at the same height from the earth's surface; the distance between the track plane and the ground surface is 500-600 km; wherein, the orbit of the satellite is elliptic; the main star is located at the center of the auxiliary star elliptical orbit.
In the above method for detecting an SAR satellite according to multidimensional information, in the first step, the primary satellite transmits a detection signal including 3 frequency bands, which are an L frequency band, a C frequency band, and an X frequency band; each frequency band corresponds to at least 3 satellites, and 3 frequency band imaging echo signals are received; the auxiliary stars corresponding to each frequency band enclose an elliptical orbit; and the auxiliary satellite track corresponding to the L frequency band is positioned at the outer ring, the auxiliary satellite track corresponding to the X frequency band is positioned at the inner ring, and the auxiliary satellite track corresponding to the C frequency band is positioned in the middle.
In the above method for detecting an SAR satellite based on multi-dimensional information detection, in the first step, the main satellite antenna is a phased array antenna or a reflector antenna; the auxiliary satellite antenna adopts a phased array antenna or a reflector antenna; the types of the N auxiliary satellite antennas are the same; the primary and secondary antennas may be of the same or different types.
In the above method for detecting an SAR satellite based on multi-dimensional information, in the second step, the detection signal is a wide beam signal, and an included angle of the detection signal is 0.9 to 1.2 °; imaging echo signals are narrow beam signals, and the included angle of the imaging echo signals is 0.3-0.4 degrees; and the auxiliary satellites corresponding to the frequency bands respectively receive the imaging echo signals of the corresponding frequency bands and transmit the imaging echo signals to the main satellite, so that the splicing imaging of the auxiliary satellites is realized.
In the foregoing method for detecting an SAR satellite by using multi-dimensional information, in the third step, the multi-band stitching imaging mode is:
the main satellite transmits detection signals of different frequency bands in a time-sharing mode to cover the ground area to be detected, each auxiliary satellite of different frequency bands irradiates continuous sub-areas of the ground area to be detected respectively by adjusting the beam direction to obtain imaging echo signals of corresponding areas and transmits the imaging echo signals to the main satellite, and the main satellite performs imaging processing and splicing on the imaging echo signals of each auxiliary satellite to obtain spliced imaging of each frequency band.
In the third step of the above method for detecting an SAR satellite through multi-dimensional information detection, the single-frequency-band three-dimensional imaging mode is:
the method comprises the following steps that a main satellite transmits a detection signal of a frequency band, and a plurality of auxiliary satellites corresponding to the frequency band simultaneously receive imaging echo signals; by designing the auxiliary satellite configuration, the auxiliary satellite has spatial position difference in the vertical sight line direction, namely equivalent sampling points, the synthetic aperture is formed in the vertical sight line direction, and single-frequency section three-dimensional imaging of each object in the ground area to be measured is obtained by carrying out tomography processing on imaging echo signals received by a plurality of auxiliary satellites.
In the foregoing method for detecting an SAR satellite by using multi-dimensional information, in the third step, the multi-band interferometric imaging mode is:
finding an object to be observed from a ground area to be observed, transmitting detection signals of different frequency bands by a main satellite in a time-sharing mode to irradiate the object to be observed, and receiving imaging echo signals of respective frequency bands by each auxiliary satellite; the main satellite carries out interference processing on imaging echo signals transmitted by the auxiliary satellites in all frequency bands to obtain interference images in different frequency bands, and the interference images are used for measuring the height of an object to be observed in the vertical direction.
In the foregoing method for detecting an SAR satellite by using multi-dimensional information, in the third step, the multi-band multi-polarization imaging mode is:
the main satellite transmits detection signals polarized in different frequency bands in a time-sharing manner, and each auxiliary satellite receives the polarized imaging echo signals in the respective frequency band; the main satellite carries out polarization processing on the polarized imaging echo signals transmitted by the auxiliary satellites in each frequency band to obtain polarization images in different frequency bands; the reflection effects of different objects in the ground area to be detected on the detection signals polarized in different frequency bands are different, so that the difference of image definition is realized; and the detection distinction of different objects in the ground area to be detected is realized through the detection signals polarized in different frequency bands.
In the foregoing method for detecting a SAR satellite through multi-dimensional information detection, in the third step, the single-frequency-band multi-azimuth GMTI imaging mode is:
the method comprises the following steps that a main satellite transmits a detection signal of a frequency band, and a plurality of auxiliary satellites in the frequency band receive imaging echo signals from different azimuth angles; and the main satellite receives the imaging echo signals of different azimuth angles transmitted by the auxiliary satellites, then performs combined processing to generate the running track of the object to be observed, and estimates the moving speed of the object to be observed.
Compared with the prior art, the invention has the beneficial effects that:
(1) the multi-dimensional information detection satellite-borne SAR system adopts a system with multiple frequency bands, multiple polarizations and multiple star formation detection, can quickly acquire observation data of different frequency bands, different polarizations and angles in an observation area, has large data correlation, and can acquire multi-dimensional information such as space dimension, frequency dimension, polarization dimension, space dimension and the like in the observation area through combined processing, thereby improving the application efficiency of the satellite-borne SAR system and expanding the application field of the system;
(2) the multidimensional information detection satellite-borne SAR system adopts a mirror image SAR framework, namely, the auxiliary satellite only receives echo signals and transmits the echo signals to the main satellite system in a real-time phase-retaining manner through an inter-satellite link, so that the auxiliary satellite does not need a high-power transmitter, a data acquisition and processing module, a large-capacity data storage module, a high-speed ground data transmission module and the like, the functions and the composition of the auxiliary satellite system are fundamentally simplified, low-cost and light development can be realized, and the development cost of the whole constellation is reduced;
(3) the multi-dimensional information detection satellite-borne SAR system provided by the invention has multi-dimensional information acquisition imaging modes such as multi-band multi-satellite spliced amplitude high-resolution wide coverage imaging, single-navigation chromatography three-dimensional imaging, multi-band (multi-polarization) interference imaging, multi-band multi-polarization imaging and multi-satellite multi-azimuth GMTI imaging, can acquire multi-dimensional information of a sensing area, and can ensure timeliness and accuracy of information acquisition.
Drawings
FIG. 1 is a flow chart of the multi-dimensional information detection SAR satellite detection of the present invention;
FIG. 2 is a schematic diagram of a SAR satellite system of the present invention;
FIG. 3 is a schematic diagram of a multi-band stitching imaging mode according to the present invention;
FIG. 4 is a schematic diagram of a single-band three-dimensional imaging mode of the present invention;
FIG. 5 is a schematic diagram of a multi-band interferometric imaging mode of the present invention;
FIG. 6 is a schematic diagram of a single-band multi-azimuth GMTI imaging mode of the invention.
Detailed Description
The invention is further illustrated by the following examples.
The invention provides a multi-frequency-band, multi-polarization and multi-satellite formation detection multi-dimensional information detection satellite-borne SAR system scheme based on a mirror SAR framework, which can realize the functions of multi-frequency-band and multi-satellite splicing high-resolution wide coverage imaging, single-navigation chromatography three-dimensional imaging, multi-frequency-band (multi-polarization) interference imaging, multi-frequency-band multi-polarization imaging, multi-satellite multi-azimuth GMTI imaging and the like, can quickly acquire multi-dimensional information of space dimensions, frequency dimensions, polarization dimensions, space dimensions and the like of an observation area, improves the application efficiency of a satellite-borne SAR system, and expands the application field of the system.
As shown in fig. 1, the method for detecting an SAR satellite by using multidimensional information specifically includes the following steps:
step one, establishing an SAR satellite system, as shown in FIG. 2, including 1 main satellite and N auxiliary satellites; n is a positive integer and is not less than 9; 1 main star and N auxiliary stars are positioned on a track plane at the same height from the ground surface; the distance between the track plane and the ground surface is 500-600 km; wherein, the orbit of the satellite is elliptic; the main star is located at the center of the auxiliary star elliptical orbit. The main satellite transmits detection signals which comprise 3 frequency bands, namely an L frequency band, a C frequency band and an X frequency band; each frequency band corresponds to at least 3 satellites, and 3 frequency band imaging echo signals are received; the auxiliary stars corresponding to each frequency band enclose an elliptical orbit; and the auxiliary satellite track corresponding to the L frequency band is positioned at the outer ring, the auxiliary satellite track corresponding to the X frequency band is positioned at the inner ring, and the auxiliary satellite track corresponding to the C frequency band is positioned in the middle. The main satellite antenna adopts a phased array antenna or a reflector antenna; the auxiliary satellite antenna adopts a phased array antenna or a reflector antenna; the types of the N auxiliary satellite antennas are the same; the primary and secondary antennas may be of the same or different types. Each auxiliary satellite has H frequency band signal receiving capacity (H is more than or equal to 1 and less than or equal to 3), and the frequency band and the number of the signal receiving frequency bands of each auxiliary satellite can be selected and configured according to needs. The main satellite only has the capacity of transmitting signals, does not directly receive echo signals reflected by the ground, the auxiliary satellite only has the capacity of receiving the echo signals reflected by the ground, and the auxiliary satellite transmits the received echo signals to the main satellite system through an inter-satellite link in a real-time phase-preserving manner based on a mirror SAR (synthetic aperture radar) architecture and is uniformly transmitted to the ground by the main satellite.
Step two, the main satellite transmits a detection signal to a ground area to be detected, the ground area to be detected reflects the detection signal to form an imaging echo signal, and the auxiliary satellite receives the imaging echo signal and feeds the imaging echo signal back to the main satellite; imaging is realized; the detection signal is a wide beam signal, and the included angle of the detection signal is 0.9-1.2 degrees; imaging echo signals are narrow beam signals, and the included angle of the imaging echo signals is 0.3-0.4 degrees; and the auxiliary satellites corresponding to the frequency bands respectively receive the imaging echo signals of the corresponding frequency bands and transmit the imaging echo signals to the main satellite, so that the splicing imaging of the auxiliary satellites is realized. The auxiliary satellite makes the frequency spectrum of the received radar echo signal move + f through carrier modulationcThen the data is forwarded to the main satellite, and coherent demodulation is carried out by using the local oscillator of the main satellite, wherein the local oscillator frequency is + f0Meanwhile, in order to eliminate the offset possibly existing in the carrier and the local oscillation frequency, a communication link is added between the main satellite and the auxiliary satellite to transmit the reference signal of the main satellite.
And step three, realizing 5 imaging modes through the SAR satellite system, wherein the imaging modes comprise a multi-band splicing imaging mode, a single-band three-dimensional imaging mode, a multi-band interference imaging mode, a multi-band multi-polarization imaging mode and a single-band multi-azimuth GMTI imaging mode.
As shown in fig. 3, the multi-band stitching imaging mode is:
the main satellite transmits detection signals of different frequency bands in a time-sharing mode to cover the ground area to be detected, each auxiliary satellite of different frequency bands irradiates continuous sub-areas of the ground area to be detected respectively by adjusting the beam direction to obtain imaging echo signals of corresponding areas and transmits the imaging echo signals to the main satellite, and the main satellite performs imaging processing and splicing on the imaging echo signals of each auxiliary satellite to obtain spliced imaging of each frequency band.
As shown in fig. 4, the single-band three-dimensional imaging mode is:
the method comprises the following steps that a main satellite transmits a detection signal of a frequency band, and a plurality of auxiliary satellites corresponding to the frequency band simultaneously receive imaging echo signals; by designing the auxiliary satellite configuration, the auxiliary satellite has spatial position difference in the vertical sight line direction, namely equivalent sampling points, the synthetic aperture is formed in the vertical sight line direction, and single-frequency section three-dimensional imaging of each object in the ground area to be measured is obtained by carrying out tomography processing on imaging echo signals received by a plurality of auxiliary satellites.
As shown in FIG. 5, the multi-band interference imaging mode is:
finding an object to be observed from a ground area to be observed, transmitting detection signals of different frequency bands by a main satellite in a time-sharing mode to irradiate the object to be observed, and receiving imaging echo signals of respective frequency bands by each auxiliary satellite; the main satellite carries out interference processing on imaging echo signals transmitted by the auxiliary satellites in all frequency bands to obtain interference images in different frequency bands, and the interference images are used for measuring the height of an object to be observed in the vertical direction.
The multi-band multi-polarization imaging mode is as follows:
the main satellite transmits detection signals polarized in different frequency bands in a time-sharing manner, and each auxiliary satellite receives the polarized imaging echo signals in the respective frequency band; the main satellite carries out polarization processing on the polarized imaging echo signals transmitted by the auxiliary satellites in each frequency band to obtain polarization images in different frequency bands; the reflection effects of different objects in the ground area to be detected on the detection signals polarized in different frequency bands are different, so that the difference of image definition is realized; and the detection distinction of different objects in the ground area to be detected is realized through the detection signals polarized in different frequency bands.
The primary satellite transmits H-polarized signals of X and C frequency bands at intervals within a first Pulse Repetition Interval (PRI), and transmits H-polarized signals of X and C frequency bands within a second PRI, thereby alternately transmitting double-frequency H-polarized signals and double-frequency V-polarized signals. The satellite 1 and the satellite 2 respectively receive only the X frequency band H and the V polarization signals, and the satellite 3 and the satellite 4 respectively receive only the C frequency band H and the V polarization signals. And imaging the satellite receiving signals to obtain dual-band HH, HV, VV and VH fully-polarized detection images.
As shown in fig. 6, the single-band multi-azimuth GMTI imaging mode is:
the method comprises the following steps that a main satellite transmits a detection signal of a frequency band, and a plurality of auxiliary satellites in the frequency band receive imaging echo signals from different azimuth angles; and the main satellite receives the imaging echo signals of different azimuth angles transmitted by the auxiliary satellites, then performs combined processing to generate the running track of the object to be observed, and estimates the moving speed of the object to be observed.
The invention provides a multi-dimensional information detection SAR detection method, which adopts a system of multi-band, multi-polarization and multi-satellite formation detection, has the capabilities of multi-band and multi-satellite splicing high-resolution wide coverage imaging, single-navigation chromatography three-dimensional imaging, multi-band (multi-polarization) interference imaging, multi-band and multi-polarization imaging, multi-satellite and multi-azimuth GMTI imaging and the like, can quickly acquire observation data of different frequency bands, different polarizations and angles in an observation area, has large data correlation, can acquire multi-dimensional information of space dimensions, frequency dimensions, polarization dimensions, space dimensions and the like in the observation area through combined processing, improves the application efficiency of a satellite-borne SAR system, and expands the application field of the system.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (10)
1. A multi-dimensional information detection SAR satellite detection method is characterized in that: the method comprises the following steps:
step one, establishing an SAR satellite system, which comprises 1 main satellite and N auxiliary satellites; n is a positive integer and is not less than 9;
step two, the main satellite transmits a detection signal to a ground area to be detected, the ground area to be detected reflects the detection signal to form an imaging echo signal, and the auxiliary satellite receives the imaging echo signal and feeds the imaging echo signal back to the main satellite; imaging is realized;
and step three, realizing 5 imaging modes through the SAR satellite system, wherein the imaging modes comprise a multi-band splicing imaging mode, a single-band three-dimensional imaging mode, a multi-band interference imaging mode, a multi-band multi-polarization imaging mode and a single-band multi-azimuth GMTI imaging mode.
2. The method for detecting the SAR satellite according to claim 1, characterized in that: in the first step, 1 main star and N auxiliary stars are positioned on a track plane at the same height from the ground surface; the distance between the track plane and the ground surface is 500-600 km; wherein, the orbit of the satellite is elliptic; the main star is located at the center of the auxiliary star elliptical orbit.
3. The method for detecting the SAR satellite according to claim 2, characterized in that: in the first step, the detection signal transmitted by the main satellite comprises 3 frequency bands, namely an L frequency band, a C frequency band and an X frequency band; each frequency band corresponds to at least 3 satellites, and 3 frequency band imaging echo signals are received; the auxiliary stars corresponding to each frequency band enclose an elliptical orbit; and the auxiliary satellite track corresponding to the L frequency band is positioned at the outer ring, the auxiliary satellite track corresponding to the X frequency band is positioned at the inner ring, and the auxiliary satellite track corresponding to the C frequency band is positioned in the middle.
4. The method for detecting the SAR satellite according to claim 3, characterized in that: in the first step, the main satellite antenna adopts a phased array antenna or a reflector antenna; the auxiliary satellite antenna adopts a phased array antenna or a reflector antenna; the types of the N auxiliary satellite antennas are the same; the primary and secondary antennas may be of the same or different types.
5. The method for detecting the SAR satellite according to claim 4, characterized in that: in the second step, the detection signal is a wide beam signal, and the included angle of the detection signal is 0.9-1.2 degrees; imaging echo signals are narrow beam signals, and the included angle of the imaging echo signals is 0.3-0.4 degrees; and the auxiliary satellites corresponding to the frequency bands respectively receive the imaging echo signals of the corresponding frequency bands and transmit the imaging echo signals to the main satellite, so that the splicing imaging of the auxiliary satellites is realized.
6. The method for detecting the SAR satellite according to claim 5, characterized in that: in the third step, the multi-band splicing imaging mode is as follows:
the main satellite transmits detection signals of different frequency bands in a time-sharing mode to cover the ground area to be detected, each auxiliary satellite of different frequency bands irradiates continuous sub-areas of the ground area to be detected respectively by adjusting the beam direction to obtain imaging echo signals of corresponding areas and transmits the imaging echo signals to the main satellite, and the main satellite performs imaging processing and splicing on the imaging echo signals of each auxiliary satellite to obtain spliced imaging of each frequency band.
7. The method for detecting the SAR satellite according to claim 6, characterized in that: in the third step, the single-frequency-band three-dimensional imaging mode is as follows:
the method comprises the following steps that a main satellite transmits a detection signal of a frequency band, and a plurality of auxiliary satellites corresponding to the frequency band simultaneously receive imaging echo signals; by designing the auxiliary satellite configuration, the auxiliary satellite has spatial position difference in the vertical sight line direction, namely equivalent sampling points, the synthetic aperture is formed in the vertical sight line direction, and single-frequency section three-dimensional imaging of each object in the ground area to be measured is obtained by carrying out tomography processing on imaging echo signals received by a plurality of auxiliary satellites.
8. The method for detecting the SAR satellite according to claim 7, wherein the method comprises the following steps: in the third step, the multi-band interference imaging mode is as follows:
finding an object to be observed from a ground area to be observed, transmitting detection signals of different frequency bands by a main satellite in a time-sharing mode to irradiate the object to be observed, and receiving imaging echo signals of respective frequency bands by each auxiliary satellite; the main satellite carries out interference processing on imaging echo signals transmitted by the auxiliary satellites in all frequency bands to obtain interference images in different frequency bands, and the interference images are used for measuring the height of an object to be observed in the vertical direction.
9. The method for detecting the SAR satellite according to claim 8, wherein the method comprises the following steps: in the third step, the multi-band multi-polarization imaging mode is as follows:
the main satellite transmits detection signals polarized in different frequency bands in a time-sharing manner, and each auxiliary satellite receives the polarized imaging echo signals in the respective frequency band; the main satellite carries out polarization processing on the polarized imaging echo signals transmitted by the auxiliary satellites in each frequency band to obtain polarization images in different frequency bands; the reflection effects of different objects in the ground area to be detected on the detection signals polarized in different frequency bands are different, so that the difference of image definition is realized; and the detection distinction of different objects in the ground area to be detected is realized through the detection signals polarized in different frequency bands.
10. The method for detecting the SAR satellite according to claim 9, wherein the method comprises the following steps: in the third step, the single-frequency-band multi-azimuth GMTI imaging mode is as follows:
the method comprises the following steps that a main satellite transmits a detection signal of a frequency band, and a plurality of auxiliary satellites in the frequency band receive imaging echo signals from different azimuth angles; and the main satellite receives the imaging echo signals of different azimuth angles transmitted by the auxiliary satellites, then performs combined processing to generate the running track of the object to be observed, and estimates the moving speed of the object to be observed.
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| CN115113204A (en) * | 2022-07-26 | 2022-09-27 | 中国科学院空天信息创新研究院 | Satellite-borne InSAR (interferometric synthetic Aperture Radar) implementation method for distributed satellite dual-band split emission |
| CN115685204A (en) * | 2022-12-28 | 2023-02-03 | 北京九天微星科技发展有限公司 | SAR imaging communication integration method and equipment for low earth orbit satellite constellation |
| CN117724117A (en) * | 2024-02-06 | 2024-03-19 | 中国科学院国家空间科学中心 | Reflection detection method, apparatus, electronic device, and computer-readable storage medium |
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