CN111505638A - Reference frequency signal generation method and device for double-base satellite-borne SAR system - Google Patents
Reference frequency signal generation method and device for double-base satellite-borne SAR system Download PDFInfo
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
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- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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Abstract
The embodiment of the application provides a reference frequency signal generation method of a double-base satellite-borne Synthetic Aperture Radar (SAR) system, which comprises the following steps: receiving a control instruction, and determining a working mode based on the control instruction; when the working mode is a double-star interference imaging mode, taking an external taming crystal oscillator as a vibration source; wherein the frequency of the external taming crystal oscillator is synchronous with a preset oscillation source; amplifying the crystal oscillator signal sent by the oscillation source to obtain an amplified crystal oscillator signal; carrying out frequency doubling on the amplified crystal oscillator signal to obtain a frequency-doubled signal; performing power distribution on the frequency-doubled signals, and outputting the frequency-doubled signals which accord with preset power; and filtering and amplifying the frequency-doubled signal which accords with the preset power, and outputting the reference frequency signal. The embodiment of the application also provides a reference frequency signal generating device and a computer storage medium of the double-base satellite-borne synthetic aperture radar SAR system.
Description
Technical Field
The invention relates to the technical field of synthetic aperture radar reference frequency signal generation, in particular to a method and a device for generating a reference frequency signal of a double-base satellite-borne SAR system and a computer storage medium.
Background
For a Synthetic Aperture Radar (SAR) system on a double-base satellite, because two satellites are required to perform interference imaging, the frequency and phase consistency of clock signals and local oscillator signals between the two satellites during imaging have high requirements, and the consistency of reference signals can determine the quality of the imaging of the double satellites to a certain extent. At present, the reference signal generation of the SAR system mainly comprises the following two methods: firstly, various reference signals required by a system are generated after frequency multiplication and frequency division of reference signals generated by a crystal oscillator through a phase-locked loop and are output after filtering and amplification; and secondly, the reference signal generated by the crystal oscillator is output after being filtered and amplified through various reference signals generated by the frequency multiplier and the frequency divider. The first method has the advantages that harmonic waves generated in the frequency multiplication process can be reduced to the maximum extent through the phase-locked loop, meanwhile, a link of a circuit in the frequency multiplication process is short, and the scheme is generally proposed to be used for generating a reference signal. The second method has the advantages of simple structure, consistent initial phase of output signal with crystal oscillator, longer frequency doubling link, more harmonic wave, less easy filtering and larger volume.
The double-base satellite-borne SAR system has a single-satellite imaging mode and a most main double-satellite interference imaging mode, and the two main technical defects of the two schemes are that a single reference frequency source in two satellites respectively provides a reference frequency signal by a crystal oscillator, and the frequency and phase relation between the two crystal oscillators is uncertain when the two crystal oscillators are powered on each time, so that the reference signals provided by the crystal oscillators are asynchronous on the two satellites, and the asynchronous signals can cause the double-satellite interference imaging to fail to work normally.
Disclosure of Invention
The embodiment of the application provides a reference frequency signal generation method of a double-base satellite-borne Synthetic Aperture Radar (SAR) system, which comprises the following steps:
receiving a control instruction, and determining a working mode based on the control instruction;
when the working mode is a double-star interference imaging mode, taking an external taming crystal oscillator as a vibration source; wherein the frequency of the external taming crystal oscillator is synchronous with a preset oscillation source;
amplifying the crystal oscillator signal sent by the oscillation source to obtain an amplified crystal oscillator signal;
carrying out frequency doubling on the amplified crystal oscillator signal to obtain a frequency-doubled signal;
performing power distribution on the frequency-doubled signals, and outputting the frequency-doubled signals which accord with preset power;
and filtering and amplifying the frequency-doubled signal which accords with the preset power, and outputting the reference frequency signal.
In some embodiments, the method further comprises:
and when the working mode is a single star imaging mode, taking an internal crystal oscillator as the oscillation source.
In some embodiments, the amplifying the crystal oscillator signal from the frequency source to obtain an amplified crystal oscillator signal includes:
and inputting the crystal oscillator signal into an input end of a microwave amplifier, and outputting the amplified crystal oscillator signal by an output end of the microwave amplifier.
In some embodiments, the frequency doubling the amplified crystal oscillator signal to obtain a frequency-doubled signal includes:
inputting the amplified crystal oscillator signal to an input end of a step diode frequency doubling circuit;
and acquiring an integer frequency-doubled signal output by the output end of the step diode frequency doubling circuit.
The embodiment of the application provides a reference frequency signal generating device of a double-base satellite-borne Synthetic Aperture Radar (SAR) system, which comprises:
the crystal oscillator switching unit is used for receiving a control instruction and determining a working mode based on the control instruction; when the working mode is a double-star interference imaging mode, taking an external taming crystal oscillator as a vibration source; wherein the frequency of the external taming crystal oscillator is synchronous with a preset oscillation source;
the power amplification unit is used for amplifying the crystal oscillator signal emitted by the oscillation source to obtain an amplified crystal oscillator signal;
the frequency doubling unit is used for doubling the frequency of the amplified crystal oscillator signal to obtain a frequency-doubled signal;
the power distribution unit is used for carrying out power distribution on the frequency-doubled signals and outputting the frequency-doubled signals which accord with preset power;
and the filtering and amplifying unit is used for filtering and amplifying the frequency-doubled signal which accords with the preset power and outputting the reference frequency signal.
In some embodiments, the crystal oscillator switching unit is further configured to:
and when the working mode is a single star imaging mode, taking an internal crystal oscillator as the oscillation source.
In some embodiments, the power amplification unit is specifically configured to:
and inputting the crystal oscillator signal into an input end of a microwave amplifier, and outputting the amplified crystal oscillator signal by an output end of the microwave amplifier.
In some embodiments, the frequency doubling unit is specifically configured to:
inputting the amplified crystal oscillator signal to an input end of a step diode frequency doubling circuit;
and acquiring an integer frequency-doubled signal output by the output end of the step diode frequency doubling circuit.
The embodiment of the application provides a reference frequency signal generating device of a double-base satellite-borne Synthetic Aperture Radar (SAR) system, which comprises: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is configured to perform the steps of the method of any of the above embodiments when running the computer program.
The computer storage medium of the present application is a computer storage medium, on which a computer program is stored, and is characterized in that, when being executed by a processor, the computer program implements the steps of the method of any one of the above embodiments.
The method comprises the steps that a control instruction is received, and a working mode is determined based on the control instruction; when the working mode is a double-star interference imaging mode, taking an external taming crystal oscillator as a vibration source; wherein the frequency of the external taming crystal oscillator is synchronous with a preset oscillation source; amplifying the crystal oscillator signal sent by the oscillation source to obtain an amplified crystal oscillator signal; carrying out frequency doubling on the amplified crystal oscillator signal to obtain a frequency-doubled signal; performing power distribution on the frequency-doubled signals, and outputting the frequency-doubled signals which accord with preset power; filtering and amplifying the frequency-doubled signal which accords with the preset power, and outputting the reference frequency signal; the method can ensure that the output signals of the external crystal oscillators in the two satellites only have a fixed phase difference, does not have frequency difference, and does not introduce random phase errors. By adopting the design method, the coherence between the reference frequency signals of two satellites can be ensured when the double satellites work.
Drawings
The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.
Fig. 1 is a schematic flow chart of a reference frequency signal generation method of a double-base satellite-borne synthetic aperture radar SAR system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a reference frequency signal generating device of a double-base satellite-borne synthetic aperture radar SAR system according to an embodiment of the present application;
fig. 3 is a schematic block diagram of a reference frequency signal generating device of a bistatic spaceborne SAR system according to an embodiment of the present application;
FIG. 4 is a schematic block diagram of direct frequency synthesis according to an embodiment of the present application;
FIG. 5 is a basic schematic block diagram of a phase locked loop according to an embodiment of the present disclosure;
FIG. 6 is a schematic block diagram of a reference frequency generating unit according to an embodiment of the present application;
FIG. 7 is a schematic diagram illustrating an external crystal oscillator influencing a hidden path of the internal crystal oscillator when the internal crystal oscillator host operates according to the embodiment of the present disclosure;
fig. 8 is a schematic diagram of a hardware structure of an apparatus according to an embodiment of the present invention.
Detailed Description
So that the manner in which the features and elements of the present embodiments can be understood in detail, a more particular description of the embodiments, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.
It should be noted that the terms "first \ second \ third" referred to in the embodiments of the present application are only used for distinguishing similar objects, and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may exchange a specific order or sequence order if allowed. It should be understood that "first \ second \ third" distinct objects may be interchanged under appropriate circumstances such that the embodiments of the application described herein may be implemented in an order other than those illustrated or described herein.
In the description of the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the term "connected" should be interpreted broadly, for example, as an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic flow chart of a method for generating a reference frequency signal of a double-base satellite-borne synthetic aperture radar SAR system according to an embodiment of the present application, where as shown in fig. 1, the method includes:
102, when the working mode is a double-star interference imaging mode, taking an external taming crystal oscillator as a vibration source; wherein, the frequency of the external taming crystal oscillator is synchronous with a preset oscillation source;
and 103, amplifying the crystal oscillator signal emitted by the oscillator to obtain an amplified crystal oscillator signal.
In some embodiments, the amplifying the crystal oscillator signal from the frequency source to obtain the amplified crystal oscillator signal includes:
and inputting the crystal oscillator signal into the input end of the microwave amplifier, and outputting the amplified crystal oscillator signal by the output end of the microwave amplifier.
And 104, performing frequency multiplication on the amplified crystal oscillator signal to obtain a frequency-multiplied signal.
In some embodiments, the frequency doubling the amplified crystal oscillator signal to obtain a frequency-doubled signal includes:
inputting the amplified crystal oscillator signal into an input end of a step diode frequency doubling circuit;
and acquiring an integer frequency-doubled signal output by the output end of the step diode frequency doubling circuit.
105, performing power distribution on the frequency-doubled signals, and outputting the frequency-doubled signals according with preset power;
and 106, filtering and amplifying the frequency-doubled signal according with the preset power, and outputting a reference frequency signal.
In some embodiments, the method further comprises:
and when the working mode is the single star imaging mode, the internal crystal oscillator is used as a vibration source.
Fig. 2 is a schematic structural diagram of a reference frequency signal generating device of a double-base satellite-borne synthetic aperture radar SAR system according to an embodiment of the present application, and as shown in fig. 2, the device includes: a crystal oscillator switching unit 201, a power amplifying unit 202, a frequency doubling unit 203, a power distribution unit 204 and a filtering amplifying unit 205; wherein,
the crystal oscillator switching unit 201 is used for receiving a control instruction and determining a working mode based on the control instruction; when the working mode is a double-star interference imaging mode, taking an external taming crystal oscillator as a vibration source; wherein, the frequency of the external taming crystal oscillator is synchronous with a preset oscillation source;
in some embodiments, the crystal switching unit 201 is further configured to: and when the working mode is the single star imaging mode, the internal crystal oscillator is used as a vibration source.
The power amplifying unit 202 is configured to amplify the crystal oscillator signal sent by the oscillation source to obtain an amplified crystal oscillator signal.
In some embodiments, the power amplification unit 202 is specifically configured to:
and inputting the crystal oscillator signal into the input end of the microwave amplifier, and outputting the amplified crystal oscillator signal by the output end of the microwave amplifier.
And the frequency doubling unit 203 is configured to perform frequency doubling on the amplified crystal oscillator signal to obtain a frequency doubled signal.
In some embodiments, the frequency doubling unit 203 is specifically configured to:
inputting the amplified crystal oscillator signal into an input end of a step diode frequency doubling circuit;
and acquiring an integer frequency-doubled signal output by the output end of the step diode frequency doubling circuit.
The power distribution unit 204 is configured to perform power distribution on the frequency-doubled signal, and output the frequency-doubled signal meeting preset power.
The filtering and amplifying unit 205 is configured to filter and amplify the frequency-multiplied signal that meets the preset power, and output a reference frequency signal.
Some embodiments of the present application provide a reference frequency signal generating device for a bistatic spaceborne SAR system, which achieves synchronization of reference signals between two satellites by introducing an internal and external dual crystal oscillators, and a schematic block diagram of the device is shown in fig. 3. In fig. 3, a satellite a and a satellite B represent two satellites of a double-base satellite-borne SAR system, each satellite has an independently operating reference frequency signal generating device (frequency source) therein, and the frequency source is used for generating a reference frequency signal required by an intra-satellite device.
In general, the reference frequency generating unit can be selected from three techniques of direct frequency synthesis, indirect frequency synthesis and direct digital frequency synthesis, and each of the three frequency synthesis techniques has advantages and disadvantages. Now, assume that the crystal oscillator provides signals as follows:
wherein ω is0Is the angular frequency of the crystal oscillator signal,
is the initial phase of the crystal oscillator signal.
The direct frequency synthesis generates each harmonic signal of a reference signal provided by a crystal oscillator through a step recovery diode, and screens out a signal with a required frequency through a filter circuit, and a schematic block diagram is shown in fig. 4, wherein the generated signal is as follows:
where i is the harmonic order and n is an integer.
If 10 harmonics are required, the remaining harmonics are filtered out by a filter to produce a signal of
The signal has strong phase correlation with a reference signal generated by a crystal oscillator.
Indirect frequency synthesis frequency multiplication of a signal by a phase locked loop, a simple schematic block diagram of which is shown in fig. 5, also produces 10 frequency-multiplied output signals:
because the phase-locked loop is locked by the phase discriminator through a plurality of phase discrimination periods, and the phase discrimination period passed by each locking is random, the output signal can increase a random phase difference on the basis of the frequency multiplication of the crystal oscillator signal
And is out of phase
Cannot be eliminated by the scaler.
The frequency source can be simply divided into a crystal oscillator switching unit and a reference frequency generating unit, and because the phase correlation between the two-satellite signals directly affects the quality of the two-satellite imaging, the reference frequency generating unit generates various reference frequencies required by the system by adopting a step diode direct frequency doubling mode, outputs the reference frequencies after filtering and amplifying for many times, ensures the correlation between various clock signals and local oscillator signals in a single satellite, and the schematic block diagram is shown in fig. 6.
The crystal oscillator switching unit mainly realizes the switching of internal and external crystal oscillators, when the satellite works in a single-satellite imaging mode, the switch is switched to the internal crystal oscillator, and the output signal of the frequency source takes the internal crystal oscillator as the reference; when the satellite works in a double-satellite interference imaging mode, the switch is switched to an external taming crystal oscillator, the output signal of the frequency source is based on the external taming crystal oscillator, the external taming crystal oscillator is taminated by a GPS (global positioning system), the output signals of the external crystal oscillators in two satellites can be ensured to have only one fixed phase difference without frequency difference, and meanwhile, the frequency multiplication of the reference frequency signal generation unit through a step diode is realized, and random phase errors are not introduced. By adopting the design method, the coherence between the reference frequency signals of two satellites can be ensured when the double satellites work.
Because the on-board equipment adopts a double-machine cold backup mode, the requirement on the isolation degree of a switch in the design is higher, and because the main machine and the standby machine are not powered up at the same time in work and the internal crystal oscillator and the external crystal oscillator are backed up through the electric bridge, a hidden path can exist between the internal crystal oscillator and the external crystal oscillator, the working frequency of the internal crystal oscillator and the working frequency of the external crystal oscillator are close, the hidden path can cause interference between the crystal oscillators, and the normal work of the system is influenced. In order to avoid mutual interference between the internal crystal oscillator and the external crystal oscillator caused by the hidden path, the scheme has higher requirement on the isolation degree of the switch, and the isolation degree between the input ports of the internal crystal oscillator and the external crystal oscillator is required to be as large as possible under the condition that the switch is not electrified. The path of the hidden path influenced by the external crystal oscillator to the internal crystal oscillator when the internal crystal oscillator host works is shown in figure 7.
When the power is enough during cross backup, the bridge can be replaced by a power combined power division mode for two power dividers so as to increase the isolation between the main machine and the standby machine and reduce the influence of a sneak path.
If the switch isolation, especially the isolation when not powered on, can not meet the system requirement, one bridge at the output cross backup of the internal crystal oscillator and the external crystal oscillator can be removed, and the potential path can be cut off.
The coherence of signals between two satellites is realized by adopting an internal and external crystal oscillator switching mode; the problem that the internal crystal oscillator cannot interfere with imaging is solved.
The reference frequency generating unit adopts a direct frequency doubling mode of a step diode, and avoids using a phase-locked loop.
The high-isolation switch can ensure the system performance and realize double-machine cold backup at the same time, thereby improving the reliability of the frequency source. Phase uncertainty of resultant output signal
In order to implement the reference frequency signal generating method of the bistatic spaceborne synthetic aperture radar SAR system according to the embodiment of the present application, the embodiment of the present application further provides a reference frequency signal generating device of the bistatic spaceborne synthetic aperture radar SAR system implemented based on hardware, and as shown in fig. 8, the reference frequency signal generating device 610 of the bistatic spaceborne synthetic aperture radar SAR system includes: a processor 61 and a memory 62 for storing computer programs capable of running on the processor, wherein,
the processor 61 is configured to execute the steps of the reference frequency signal generating method of the double-base satellite-borne synthetic aperture radar SAR system in the above-mentioned embodiment when running the computer program at the first terminal.
The reference frequency signal generating device of the bistatic satellite-borne synthetic aperture radar SAR system and the reference frequency signal generating method of the bistatic satellite-borne synthetic aperture radar SAR system provided by the embodiments belong to the same concept, and specific implementation processes thereof are detailed in the method embodiments and are not described herein again.
Of course, in practical applications, as shown in fig. 8, the reference frequency signal generating apparatus of the double-base space-borne synthetic aperture radar SAR system may further include at least one communication interface 63. The various components of the reference frequency signal generating apparatus of the double-based space-borne synthetic aperture radar SAR system are coupled together by a bus system 64. It will be appreciated that the bus system 64 is used to enable communications among the components. The bus system 64 includes a power bus, a control bus, and a status signal bus in addition to the data bus. For clarity of illustration, however, the various buses are labeled as bus system 64 in fig. 8.
Among other things, a communication interface 63 for interacting with other devices.
Specifically, the processor 61 may send an operation result query request to the application server corresponding to the callee application through the communication interface 63, and obtain an operation result of the callee application sent by the application server.
The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a magnetic Random Access Memory (FRAM), a magnetic surface Memory, an optical Disc, or a Compact Disc Read-Only Memory (CD-ROM), a Flash Memory (magnetic surface Memory), a magnetic surface Memory, a magnetic disk, or a magnetic Disc Read-Only Memory (CD-ROM), a Compact Disc Read-Only Memory (magnetic surface Memory), a magnetic surface Memory (magnetic surface Memory), a Dynamic Random Access Memory (SDRAM), or a Dynamic Random Access Memory (SDRAM), which may be of any type including but not limited to DRAM, Random Access memories (SDRAM, RAM, SDRAM, RAM.
In an embodiment of the present application, a computer-readable storage medium is further provided, which is used for storing the computing program provided in the foregoing embodiment, so as to complete the foregoing method steps. The computer readable storage medium can be Memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface Memory, optical disk, or CD-ROM; or various devices including one or any combination of the above memories, such as mobile phones, computers, smart appliances, servers, etc.
It should be noted that: the technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.
The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application.
Claims (10)
1. A method for generating a reference frequency signal of a double-base satellite-borne Synthetic Aperture Radar (SAR) system is characterized by comprising the following steps:
receiving a control instruction, and determining a working mode based on the control instruction;
when the working mode is a double-star interference imaging mode, taking an external taming crystal oscillator as a vibration source; wherein the frequency of the external taming crystal oscillator is synchronous with a preset oscillation source;
amplifying the crystal oscillator signal sent by the oscillation source to obtain an amplified crystal oscillator signal;
carrying out frequency doubling on the amplified crystal oscillator signal to obtain a frequency-doubled signal;
performing power distribution on the frequency-doubled signals, and outputting the frequency-doubled signals which accord with preset power;
and filtering and amplifying the frequency-doubled signal which accords with the preset power, and outputting the reference frequency signal.
2. The method of claim 1, further comprising:
and when the working mode is a single star imaging mode, taking an internal crystal oscillator as the oscillation source.
3. The method of claim 1, wherein amplifying the crystal oscillator signal from the frequency source to obtain an amplified crystal oscillator signal comprises:
and inputting the crystal oscillator signal into an input end of a microwave amplifier, and outputting the amplified crystal oscillator signal by an output end of the microwave amplifier.
4. The method according to claim 3, wherein the frequency doubling the amplified crystal oscillator signal to obtain a frequency doubled signal comprises:
inputting the amplified crystal oscillator signal to an input end of a step diode frequency doubling circuit;
and acquiring an integer frequency-doubled signal output by the output end of the step diode frequency doubling circuit.
5. A reference frequency signal generating apparatus of a bistatic satellite-borne Synthetic Aperture Radar (SAR) system, the apparatus comprising:
the crystal oscillator switching unit is used for receiving a control instruction and determining a working mode based on the control instruction; when the working mode is a double-star interference imaging mode, taking an external taming crystal oscillator as a vibration source; wherein the frequency of the external taming crystal oscillator is synchronous with a preset oscillation source;
the power amplification unit is used for amplifying the crystal oscillator signal emitted by the oscillation source to obtain an amplified crystal oscillator signal;
the frequency doubling unit is used for doubling the frequency of the amplified crystal oscillator signal to obtain a frequency-doubled signal;
the power distribution unit is used for carrying out power distribution on the frequency-doubled signals and outputting the frequency-doubled signals which accord with preset power;
and the filtering and amplifying unit is used for filtering and amplifying the frequency-doubled signal which accords with the preset power and outputting the reference frequency signal.
6. The apparatus of claim 5, wherein the crystal oscillator switching unit is further configured to:
and when the working mode is a single star imaging mode, taking an internal crystal oscillator as the oscillation source.
7. The apparatus of claim 5, wherein the power amplification unit is specifically configured to:
and inputting the crystal oscillator signal into an input end of a microwave amplifier, and outputting the amplified crystal oscillator signal by an output end of the microwave amplifier.
8. The apparatus according to claim 7, wherein the frequency doubling unit is specifically configured to:
inputting the amplified crystal oscillator signal to an input end of a step diode frequency doubling circuit;
and acquiring an integer frequency-doubled signal output by the output end of the step diode frequency doubling circuit.
9. A reference frequency signal generating apparatus of a bistatic satellite-borne Synthetic Aperture Radar (SAR) system, the apparatus comprising: a processor and a memory for storing a computer program capable of running on the processor;
wherein the processor is adapted to perform the steps of the method of any one of claims 1 to 4 when running the computer program.
10. A computer storage medium on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 4.
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| CN113406621A (en) * | 2021-05-21 | 2021-09-17 | 中国科学院空天信息创新研究院 | Phase synchronization method, satellite-borne radar and ground receiving station |
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