CN113466806A - Method and system for inhibiting same frequency interference of radar - Google Patents
Method and system for inhibiting same frequency interference of radar Download PDFInfo
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- CN113466806A CN113466806A CN202111011284.0A CN202111011284A CN113466806A CN 113466806 A CN113466806 A CN 113466806A CN 202111011284 A CN202111011284 A CN 202111011284A CN 113466806 A CN113466806 A CN 113466806A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The invention discloses a method and a system for inhibiting same frequency interference of a radar, wherein the method comprises the following steps: keeping the system synchronization of the radars of different stations; controlling the working time sequence of the radar of each station to ensure that the distance spectrum corresponding to the echo signal of the radar of other stations is out of the effective distance spectrum of the echo signal of the radar of the station; and intercepting echo signals in the effective distance spectrum corresponding to the radar of each station for storage and analysis. The system comprises: the global navigation satellite system is used for transmitting standard time information to radars of different sites; the radar is provided with a plurality of stations which are respectively positioned at different sites and used for receiving the standard time information and calibrating the local clock according to the navigation information so as to synchronize the radar with the standard time information; and the central control station is used for scheduling the plurality of radars to output radio-frequency signals with fixed phase delay according to the corresponding working time sequence, so that the distance spectrums corresponding to the echo signals of the radars of other sites are out of the effective distance spectrum of the echo signal of the radar of the site.
Description
Technical Field
The invention relates to the technical field of radar signal anti-interference, in particular to a method and a system for inhibiting same frequency interference of a radar.
Background
At present, there are two methods for solving the same frequency interference of radar: one is to operate each radar in different frequency ranges, but as the number of stations in the radar network is increased gradually, the method will cause the waste of frequency spectrum resources; another method is to divide each radar into different time periods to work alternately, which increases the radar accumulation time and reduces the radar detection performance.
Disclosure of Invention
In order to solve the problems of frequency spectrum resource waste and radar detection performance reduction, the invention aims to provide a method and a system for inhibiting same frequency interference of a radar.
The invention provides a method for inhibiting same frequency interference of a radar, which comprises the following steps:
keeping the system synchronization of the radars of different stations;
controlling the working time sequence of the radar of each station to ensure that the distance spectrum corresponding to the echo signal of the radar of other stations is out of the effective distance spectrum of the echo signal of the radar of the station;
and intercepting echo signals in the effective distance spectrum corresponding to the radar of each station for storage and analysis.
As a further improvement of the present invention, the controlling the working timing sequence of the radar of each station to make the distance spectrum corresponding to the echo signal of the radar of another station outside the effective distance spectrum of the echo signal of the radar of the station includes:
the time sequence control module controls the radars of different stations to ensure that the radar of the next station has fixed delay in the working time sequence compared with the radar of the previous station;
each station radar outputs radio frequency signals according to the corresponding working time sequence;
and processing the echo signals received by the radar of each station to obtain the distance spectrum corresponding to each echo signal.
As a further improvement of the present invention, the fixed delay is calculated by:
wherein the content of the first and second substances,
in order to fix the delay, the delay is fixed,
the effective distance spectral bandwidth is the bandwidth of the spectrum,
in the form of a chirp slope, the chirp rate,
the maximum detection range of the radar is obtained,
in order to be the speed of light,
in order to be a bandwidth,
is the radar chirp time.
As a further improvement of the present invention, said keeping the radars of different stations synchronized comprises:
the global navigation satellite system transmits standard time information to radars of different sites;
the radar of each station calibrates a local clock to be synchronous with the standard time information according to the received standard time information and outputs a tame clock;
and after signal processing is carried out on the tame clock, the tame clock is locked as a working clock of each station radar.
The invention also provides a radar same frequency interference suppression system, which comprises:
the global navigation satellite system is used for transmitting standard time information to radars of different sites;
the radar is provided with a plurality of radars which are respectively positioned at different stations and used for receiving the standard time information and calibrating a local clock according to the standard time information so as to synchronize the radars with the standard time information;
and the central control station is used for scheduling a plurality of radars to output radio frequency signals with fixed phase delay according to corresponding working time sequences, so that the distance spectrums corresponding to the echo signals of the radars of other sites are out of the effective distance spectrum of the echo signal of the radar of the site.
As a further improvement of the invention, the global navigation satellite system is a GPS navigation system or a Beidou satellite navigation system.
As a further improvement of the invention, the radar comprises:
the signal receiving module comprises a standard time information receiving module and an echo signal receiving module, the standard time information receiving module is used for receiving standard time information sent by the global navigation satellite system, and the echo signal receiving module is used for receiving an echo signal corresponding to the radio-frequency signal;
the signal processing module is used for analyzing the standard time information to keep the radar and the standard time information synchronous, and the signal processing unit is further used for processing and calculating the echo signal to obtain a distance spectrum corresponding to the echo signal;
the signal generation module is used for outputting radio frequency signals according to the dispatching of the central control station and the working time sequence of the radar;
and the control module is used for storing and analyzing the echo signals in the effective distance spectrum corresponding to the radar.
As a further improvement of the present invention, the signal processing module includes a standard time information processing module and an echo signal processing module;
the standard time information processing module comprises a satellite communication module and a time sequence control module, and the satellite communication module is in communication connection with the miniature receiver and is used for analyzing the time service information of the global navigation satellite system; the time sequence control module is in signal connection with the time sequence control module and is used for generating working pulses according to the time service information;
the echo signal processing module comprises a digital signal processing module and a USB communication module, wherein the input end of the digital signal processing module and the receiving front-end module are used for carrying out orthogonal decomposition, down-sampling and fast Fourier transform processing on the echo signal to obtain a distance spectrum; the USB communication module is in signal connection with the output end of the digital signal processing module and is used for uploading echo information in the effective distance spectrum of the radar of the station to the control module for storage.
The invention also provides an electronic device comprising a memory and a processor, wherein the memory is configured to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement any of the methods described herein.
The invention also provides a computer-readable storage medium having stored thereon a computer program for execution by a processor to perform the method.
The invention has the beneficial effects that: the radar of different stations is kept synchronous through the global navigation satellite system, the radar of each station is controlled to output radio frequency signals with fixed phase delay, so that echo signals of the radars of different stations can be distinguished in the distance spectrum, and the radar of the station only needs to store and analyze the echo signals in the effective distance spectrum, so that the aim of inhibiting the co-frequency interference of the radar is fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a flowchart of a method for suppressing co-channel interference of a radar according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating an operating state of a ground wave radar network based on satellite synchronization according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the working principle of a satellite synchronization-based ground wave radar according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a working timing sequence of a ground wave radar network according to an embodiment of the present invention;
fig. 5 is a distance spectrum of simulation of co-channel interference suppression of a ground wave radar network according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, in the description of the present invention, the terms used are for illustrative purposes only and are not intended to limit the scope of the present invention. The terms "comprises" and/or "comprising" are used to specify the presence of stated elements, steps, operations, and/or components, but do not preclude the presence or addition of one or more other elements, steps, operations, and/or components. The terms "first," "second," and the like may be used to describe various elements, not necessarily order, and not necessarily limit the elements. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified. These terms are only used to distinguish one element from another. These and/or other aspects will become apparent to those of ordinary skill in the art in view of the following drawings, and the description of the embodiments of the present invention will be more readily understood by those of ordinary skill in the art. The drawings are only for purposes of illustrating the described embodiments of the invention. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated in the present application may be employed without departing from the principles described in the present application.
In the related technology, a high-frequency ground wave radar is used for detecting dynamic parameters such as wind, waves and currents on the surface of an ocean, a low-speed moving target and the like. A single radar can only detect the radial component of the running target speed in the sea area, so that two or more than two ground wave radar networks are usually required to detect the same sea area, and the radial component information of the running target acquired by each radar distributed at different positions is fused to obtain target vector information. Along with the construction of the national ground wave radar network, the ground wave radars are distributed more and more densely along the coast, and the problem of co-channel interference in the radar network is more and more prominent. The ground wave radar works in a high frequency band, the frequency spectrum resource of the ground wave radar is very tight, and the ground wave radar is widely applied to radio stations, maritime mobile communication, amateur wireless amateurs and the like. The method and system for suppressing co-channel interference of radar related to the present application will be described below by taking a ground wave radar network as an example.
As shown in fig. 1, a method for suppressing co-channel interference of a ground wave radar network according to an embodiment of the present invention includes:
keeping the system synchronization of the radars of different stations;
controlling the working time sequence of the radar of each station to ensure that the distance spectrum corresponding to the echo signal of the radar of other stations is out of the effective distance spectrum of the echo signal of the radar of the station;
and intercepting echo signals in the effective distance spectrum corresponding to the radar of each station for storage and analysis.
For example, the ground wave radars distributed on different coastlines form a ground wave radar network for detecting dynamic parameters such as wind, waves and currents on the surface of the ocean or targets moving at low speed. And the ground wave radars distributed on different coastlines are navigated through a GPS navigation system or a Beidou satellite navigation system or other global navigation satellite systems, so that all the ground wave radars in the ground wave radar network and the global navigation satellite system are kept synchronous. The time sequence control module can ensure that each ground wave radar in the ground wave radar network can generate pulse with fixed delay relative to pulse per second (as shown in fig. 3), and the time sequence control module can control the DDS module to generate radio frequency signals with the same frequency and fixed phase delay. Each ground wave radar receives echo signals of the ground wave radars of other sites besides the own echo signal, distance spectrums corresponding to the echoes are calculated after digital signal processing, and the distance spectrums corresponding to the echo signals of the radars of the other sites are beyond the bandwidth of the effective distance spectrum corresponding to the radar of the local site. Echo signals in the ground wave radar network are distinguished according to the distance spectrum, and the ground wave radar only needs to store and analyze the echo signals in the effective distance spectrum so as to achieve the purpose of inhibiting the interference of the echo signals of other site radars and not reduce the detection performance of the ground wave radar.
An optional embodiment, the controlling the operation timing sequence of the radar of each station so that the distance spectrum corresponding to the echo signal of the radar of another station is outside the effective distance spectrum of the echo signal of the radar of the station includes:
the time sequence control module controls the radars of different stations to ensure that the radar of the next station has fixed delay in the working time sequence compared with the radar of the previous station;
each station radar outputs radio frequency signals according to the corresponding working time sequence;
and processing the echo signals received by the radar of each station to obtain the distance spectrum corresponding to each echo signal.
In an optional implementation manner, the fixed delay is calculated by:
wherein the content of the first and second substances,
in order to fix the delay, the delay is fixed,
the effective distance spectral bandwidth is the bandwidth of the spectrum,
in the form of a chirp slope, the chirp rate,
the maximum detection range of the radar is obtained,
the speed of light, the bandwidth,
is the radar chirp time. Wherein the effective distance spectral bandwidth
The size of the effective distance spectrum bandwidth is determined by the number of radar stations working synchronously, namely the effective distance spectrum bandwidth is more than or equal to the ratio of the maximum distance spectrum bandwidth to the number of radar stations
The determination of (2) can calculate the radar operating performance (maximum detection range) according to the formula
The calculation formula only represents the confirmed effective distance spectrum bandwidth of the synchronous working state
In the case of (2), effective distance spectral bandwidth
The maximum detection range and delay time of the radar.
It can be understood that the ground wave radar adopts a linear frequency modulation interrupted continuous wave system, and the fixed delay of the working time sequence of each radar in the ground wave radar network relative to the second pulse is related to the linear frequency modulation time, the linear frequency modulation width, the gate control period, the gate control pulse width and the maximum detection distance of the radar. Assuming that the linear frequency modulation time of the ground wave radar is
A bandwidth of
The gating period is
The gating pulse width is
The maximum detection distance of the ground wave radar is
The following calculations are possible:
linear chirp slope of
Effective range spectral bandwidth of
Maximum range spectral bandwidth of
The effective co-frequency interference in the ground wave radar network always has the maximum station number of
The minimum delay time of the working pulse of adjacent radar in the ground wave radar network is
The interval of radar emission signals of adjacent sites is set to be larger than or equal to the minimum delay time of working pulses, namely, the radar emission signals of each site have certain fixed delay relative to second pulses in an initial state, the fixed delay can enable signals emitted by the radars of the adjacent sites to have certain frequency difference, and the frequency difference can enable distance spectrums of echo signals of radars of other sites to be out of the effective distance spectrum bandwidth of the radar of the site.
An alternative embodiment, said keeping the radars of different stations synchronized, comprises:
the global navigation satellite system transmits standard time information to radars of different sites;
the radar of each station calibrates a local clock to be synchronous with the standard time information according to the received standard time information and outputs a tame clock;
and after signal processing is carried out on the tame clock, the tame clock is locked as a working clock of each station radar.
As shown in fig. 2, taking three sets of ground wave radars as an example for explanation, the three ground wave radar stations receive standard time information transmitted by a GPS navigation system or a beidou satellite navigation system through respective satellite receiving antennas thereof, so that the three ground wave radar stations and the navigation form a synchronous networking. The central control station is dispatched along with the three ground wave radars through network communication, the three ground wave radars are controlled to output radio frequency signals according to respective working time sequences, and the control device can control the transmitting time and the transmitting frequency of the ground wave radar signals.
The radar same frequency interference suppression system of the embodiment of the invention comprises:
the global navigation satellite system is used for transmitting standard time information to radars of different sites;
the radar is provided with a plurality of radars which are respectively positioned at different stations and used for receiving the standard time information and calibrating a local clock according to the standard time information so as to synchronize the radars with the standard time information;
and the central control station is used for scheduling a plurality of radars to output radio frequency signals with fixed phase delay according to corresponding working time sequences, so that the distance spectrums corresponding to the echo signals of the radars of other sites are out of the effective distance spectrum of the echo signal of the radar of the site.
For example, as shown in fig. 2, ground wave radars of a plurality of sites form a synchronous networking by the action of a global navigation satellite system, and receive scheduling of a central console through network communication. The frequency of a plurality of ground wave radar radio frequency signals and the working time sequence of a plurality of ground wave radars realize dual control, thereby the frequency difference between two adjacent ground wave radar transmitting signals can be controlled, and the echo signals of a plurality of ground wave radars can be distinguished from the distance spectrum.
In the present embodiment, three ground wave radars are used as an example for description. The system comprises three ground wave radars distributed on different coastlines, a GPS navigation system and a central control station. Each ground wave radar comprises a satellite receiving antenna and a transceiving antenna, wherein the satellite receiving antenna is used for receiving standard time information transmitted by a GPS navigation system; the receiving and transmitting antenna is used for transmitting the radio-frequency signals output by the radar and receiving echo signals corresponding to the radio-frequency signals. And the central control station schedules the three ground wave radars through network communication.
In an alternative embodiment, the gnss is a GPS navigation system or a beidou satellite navigation system. Other global navigation satellite systems can also be selected to synchronize the ground wave radars of a plurality of sites, and are not limited to the two global navigation satellite systems.
In an alternative embodiment, the radar includes:
the signal receiving module comprises a standard time information receiving module and an echo signal receiving module, the standard time information receiving module is used for receiving standard time information sent by the global navigation satellite system, and the echo signal receiving module is used for receiving an echo signal corresponding to the radio-frequency signal;
the signal processing module is used for analyzing the standard time information to keep the radar and the standard time information synchronous, and the signal processing unit is further used for processing and calculating the echo signal to obtain a distance spectrum corresponding to the echo signal;
the signal generation module is used for outputting radio frequency signals according to the dispatching of the central control station and the working time sequence of the radar;
and the control module is used for storing and analyzing the echo signals in the effective distance spectrum corresponding to the radar.
In an optional embodiment, the signal processing module includes a standard time information processing module and an echo signal processing module;
the standard time information processing module comprises a satellite communication module and a time sequence control module, and the satellite communication module is in communication connection with the miniature receiver and is used for analyzing the time service information of the global navigation satellite system; the time sequence control module is in signal connection with the time sequence control module and is used for generating working pulses according to the time service information;
the echo signal processing module comprises a digital signal processing module and a USB communication module, wherein the input end of the digital signal processing module and the receiving front-end module are used for carrying out orthogonal decomposition, down-sampling and fast Fourier transform processing on the echo signal to obtain a distance spectrum; the USB communication module is in signal connection with the output end of the digital signal processing module and is used for uploading echo information in the effective distance spectrum of the radar of the station to the control module for storage.
As shown in fig. 3, the working principle of each ground wave radar in the ground wave radar net is as follows:
a satellite receiving line of the ground wave radar receives standard time information transmitted by a global navigation satellite system and transmits the standard time information to a satellite receiver; the satellite receiver analyzes the standard time information, calibrates a radar local clock to keep synchronous with the standard time information, and outputs a tame clock to the signal processing module; the signal processing module locks the tame clock to the operating clock of the radar system using its own PLL resources.
The satellite communication module is communicated with a satellite receiver through a 485 bus, analyzes time, minute and second time service information and receives a second pulse signal; the time sequence control module generates a working pulse with a certain delay time by taking the pulse per second as a reference (as shown in figure 4); the DDS generation module outputs a radio frequency signal with fixed phase delay according to the working pulse of the time sequence control module.
Receiving an echo signal corresponding to a radio frequency signal by a receiving antenna of the ground wave radar, and receiving echo signals of other station radars besides the echo signal of the station radar; the receiving front-end module carries out filtering amplification and frequency mixing filtering processing on each received echo signal to obtain an intermediate frequency signal, and the intermediate frequency signal is subjected to AD sampling and then is transmitted to the digital signal processing module; and the digital signal processing module performs orthogonal decomposition, down-sampling, FFT (fast Fourier transform) and other processing on the sampling signals to obtain distance spectrums corresponding to the echo signals. Because each station radar transmits signals with certain phase delay initially, and the phase delay caused by space propagation is added, the distance spectrums of the echo signals of other station radars are distributed outside the effective distance spectrum corresponding to the station radar, and therefore the live peeling signals of the plurality of station radars can be distinguished from the distance spectrum. Echo information in the effective distance spectrum of the radar of the station is uploaded to a radar console through a USB communication module and stored so as to prevent the echo information of the radar of other stations from interfering with the echo information of the radar of the station.
The application also relates to an electronic device comprising the server, the terminal and the like. The electronic device includes: at least one processor; a memory communicatively coupled to the at least one processor; and a communication component communicatively coupled to the storage medium, the communication component receiving and transmitting data under control of the processor; wherein the memory stores instructions executable by the at least one processor to implement the method of the above embodiments.
In an alternative embodiment, the memory is used as a non-volatile computer-readable storage medium for storing non-volatile software programs, non-volatile computer-executable programs, and modules. The processor executes various functional applications of the device and data processing, i.e., implements the method, by executing nonvolatile software programs, instructions, and modules stored in the memory.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store a list of options, etc. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and such remote memory may be connected to the external device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
One or more modules are stored in the memory and, when executed by the one or more processors, perform the methods of any of the method embodiments described above.
The product can execute the method provided by the embodiment of the application, has corresponding functional modules and beneficial effects of the execution method, and can refer to the method provided by the embodiment of the application without detailed technical details in the embodiment.
The present application also relates to a computer-readable storage medium for storing a computer-readable program for causing a computer to perform some or all of the above-described method embodiments.
That is, as can be understood by those skilled in the art, all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those of ordinary skill in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
It will be understood by those skilled in the art that while the present invention has been described with reference to exemplary embodiments, various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A method for suppressing same-frequency interference of radar is characterized in that the method comprises the following steps:
keeping the system synchronization of the radars of different stations;
controlling the working time sequence of each station radar to ensure that the radar of the next station has fixed delay in the working time sequence compared with the radar of the previous station;
each station radar outputs radio frequency signals according to the corresponding working time sequence, so that the distance spectrums corresponding to the echo signals of other station radars are out of the effective distance spectrum of the echo signal of the station radar;
and intercepting echo signals in the effective distance spectrum corresponding to the radar of each station for storage and analysis.
2. The method of claim 1, wherein the radar employs a chirp discontinuous continuous wave regime.
3. The method of claim 2, wherein the fixed delay is calculated by:
wherein the content of the first and second substances,
in order to fix the delay, the delay is fixed,
the effective distance spectral bandwidth is the bandwidth of the spectrum,
in the form of a chirp slope, the chirp rate,
the maximum detection range of the radar is obtained,
in order to be the speed of light,
in order to be a bandwidth,
is the radar chirp time.
4. The method of claim 1, wherein synchronizing the radars of different sites comprises:
the global navigation satellite system transmits standard time information to radars of different sites;
the radar of each station calibrates a local clock to be synchronous with the standard time information according to the received standard time information and outputs a tame clock;
and after signal processing is carried out on the tame clock, the tame clock is locked as a working clock of each station radar.
5. A radar co-channel interference suppression system, the system comprising:
the global navigation satellite system is used for transmitting standard time information to radars of different sites;
the radar is provided with a plurality of radars which are respectively positioned at different stations and used for receiving the standard time information and calibrating a local clock according to the standard time information so as to synchronize the radars with the standard time information;
and the central control station is used for scheduling a plurality of radars to output radio frequency signals with fixed phase delay according to corresponding working time sequences, so that the distance spectrums corresponding to the echo signals of the radars of other sites are out of the effective distance spectrum of the echo signal of the radar of the site.
6. The system of claim 5, wherein the global navigation satellite system is a GPS navigation system or a Beidou satellite navigation system.
7. The system of claim 5, wherein the radar comprises:
the signal receiving module comprises a standard time information receiving module and an echo signal receiving module, the standard time information receiving module is used for receiving standard time information sent by the global navigation satellite system, and the echo signal receiving module is used for receiving an echo signal corresponding to the radio-frequency signal;
the signal processing module is used for analyzing the standard time information to keep the radar and the standard time information synchronous, and the signal processing unit is further used for processing and calculating the echo signal to obtain a distance spectrum corresponding to the echo signal;
the signal generation module is used for outputting radio frequency signals according to the dispatching of the central control station and the working time sequence of the radar;
and the control module is used for storing and analyzing the echo signals in the effective distance spectrum corresponding to the radar.
8. The system of claim 7, wherein the signal processing module comprises a standard time information processing module and an echo signal processing module;
the standard time information processing module comprises a satellite communication module and a time sequence control module, and the satellite communication module is in communication connection with the miniature receiver and is used for analyzing the time service information of the global navigation satellite system; the time sequence control module is in signal connection with the time sequence control module and is used for generating working pulses according to the time service information;
the echo signal processing module comprises a digital signal processing module and a USB communication module, wherein the input end of the digital signal processing module and the receiving front-end module are used for carrying out orthogonal decomposition, down-sampling and fast Fourier transform processing on the echo signal to obtain a distance spectrum; the USB communication module is in signal connection with the output end of the digital signal processing module and is used for uploading echo information in the effective distance spectrum of the radar of the station to the control module for storage.
9. An electronic device comprising a memory and a processor, wherein the memory is configured to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the method of any of claims 1-4.
10. A computer-readable storage medium, on which a computer program is stored, the computer program being executable by a processor for implementing the method according to any one of claims 1-4.
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| CN102279397A (en) * | 2011-07-15 | 2011-12-14 | 涂亚庆 | Active frequency conversion type LFMCW radar distance-measuring device |
| CN104062648A (en) * | 2014-07-11 | 2014-09-24 | 武汉大学 | Distributed-network high-frequency ground wave radar system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102279397A (en) * | 2011-07-15 | 2011-12-14 | 涂亚庆 | Active frequency conversion type LFMCW radar distance-measuring device |
| CN104062648A (en) * | 2014-07-11 | 2014-09-24 | 武汉大学 | Distributed-network high-frequency ground wave radar system and control method thereof |
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