CN114994687B - Dual-frequency atmospheric radar system and control method thereof - Google Patents
Dual-frequency atmospheric radar system and control method thereof Download PDFInfo
- Publication number
- CN114994687B CN114994687B CN202210598670.2A CN202210598670A CN114994687B CN 114994687 B CN114994687 B CN 114994687B CN 202210598670 A CN202210598670 A CN 202210598670A CN 114994687 B CN114994687 B CN 114994687B
- Authority
- CN
- China
- Prior art keywords
- frequency
- radar
- antenna
- meteor
- dual
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/95—Radar or analogous systems specially adapted for specific applications for meteorological use
-
- 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
-
- 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
- G01S7/411—Identification of targets based on measurements of radar reflectivity
-
- 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
- G01S7/414—Discriminating targets with respect to background clutter
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Electromagnetism (AREA)
- Automation & Control Theory (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a double-frequency atmospheric radar system and a control method thereof, comprising the following steps: based on the control analysis host computer, a control instruction is sent to the dual-frequency multi-mode digital receiver, a dual-frequency excitation signal is generated and output to the dual-frequency transmitter to amplify the dual-frequency excitation signal; transmitting the amplified double-frequency excitation signal to a radar antenna feeder for processing, and generating an echo signal; transmitting the echo signals to a dual-frequency multi-mode digital receiver, matching different observation modes according to the types of different echo signals for observation, obtaining baseband data and transmitting the baseband data to a control analysis host; and the control analysis host computer generates a radar data product according to the baseband data inversion. The invention can realize double-frequency detection of the radar system, effectively improve the system detection efficiency of the composite atmospheric radar such as ST-meteor radar, reduce the requirement of transmitting power and improve the reliability and the cost efficiency ratio.
Description
Technical Field
The invention belongs to the field of atmospheric radars, and particularly relates to a double-frequency atmospheric radar system and a control method thereof.
Background
The composite atmospheric radar based on the design ideas of digital radar and software radar is a novel atmospheric radar device. For example, a stratosphere-troposphere (ST) -meteor radar working at 30-65 MHz can utilize the atmospheric turbulence of clear sky and the scattered echo of the incident electromagnetic wave by a plasma gas column (called meteor trail) generated by meteor ablation to acquire the atmospheric wind field near the ground-20 km and 70-110km in a time-sharing detection mode. At present, the radars are all single-frequency radar systems with the working frequency near 50MHz, such as literature Antarctic meteor observations using the Davis MST and meteor radars (authors: holdsworth, D.A. and the like, publication: advances in Space Research, publication: volume 42, 2008, page numbers: 143-154, doi: 10.1016/j.asr.2007.02.037), and literature high-level atmospheric temperature in full-sky meteor radar observation (authors: yi Wen and the like, publication: geophysics journal, publication: volume 57, 8, 2014.08, page numbers: 2423-2432). Because the working frequency is not optimized for detecting the meteor trail, the meteor detection efficiency of the single-frequency radar is low, the detection capability of the similar meteor radar can be achieved only by improving the output power of a transmitter, and the energy consumption of a radar system is high. Meanwhile, the higher transmitting power also brings the problems of high system use and maintenance cost, high failure rate, low reliability and the like.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a double-frequency atmospheric radar system and a control method thereof, wherein the radar system utilizes two frequencies to respectively carry out ST wind field detection and meteor wind field detection, simultaneously meets the performance requirements of ST wind field detection and meteor detection of the system, reduces the transmission power requirement of the radar system, and improves the reliability and the cost efficiency. Meanwhile, the design thought of the invention can be applied to other composite atmospheric radars such as medium-frequency partial reflection-meteor radars and the like.
In order to achieve the above object, the present invention provides the following solutions: a dual-frequency atmospheric radar system, comprising:
the double-frequency multi-mode digital receiver is used for generating a double-frequency excitation signal and receiving an echo signal; parallel processing the multichannel digital radio frequency signals to generate baseband data;
the control analysis host is connected with the dual-frequency multi-mode digital receiver and is used for sending parameter control instructions, processing baseband data and inverting to generate radar data products;
the dual-frequency transmitter is connected with the dual-frequency multi-mode digital receiver and is used for amplifying the dual-frequency excitation signal;
and Lei Datian feeder lines respectively connected with the double-frequency multimode digital receiver and the double-frequency transmitter and used for receiving the amplified double-frequency excitation signals, carrying out power distribution and phase shift and receiving echo signals.
Preferably, the dual-frequency multimode digital receiver at least comprises an excitation source, an ST observation mode receiving channel, a meteor observation mode receiving channel and a digital signal processor;
the excitation source is used for generating a double-frequency excitation signal transmitted by the radar system and outputting the double-frequency excitation signal to the double-frequency transmitter;
the ST observation mode receiving channel is used for receiving an echo signal with frequency and carrying out amplitude limiting, amplifying, filtering and A/D conversion;
the meteor observation mode receiving channel is used for receiving the frequency two-echo signal and carrying out amplitude limiting, amplifying, filtering and A/D conversion;
the digital signal processor is used for processing the multichannel digital radio frequency signals in parallel, generating baseband data and outputting the baseband data to the control analysis host.
Preferably, the Lei Datian feeder comprises at least an antenna controller, an ST radar antenna array, a meteor radar transmitting antenna and a meteor radar receiving antenna;
the antenna controller is used for receiving the excitation signal and performing power distribution and phase shift on the excitation signal;
the ST radar antenna array is shared by receiving and transmitting, and is used for transmitting a frequency-excitation signal and receiving a frequency-echo signal in a time-sharing manner;
the meteor radar transmitting antenna is used for receiving and transmitting frequency two excitation signals;
the meteor radar receiving antenna is used for receiving a frequency-echo signal.
Preferably, the antenna controller comprises an ST antenna control unit and a meteor antenna control unit;
the ST antenna control unit is used for receiving a frequency-excitation signal, carrying out power distribution and phase shift on the frequency-excitation signal, outputting the frequency-excitation signal to the ST radar antenna array, processing a frequency-echo signal received by the ST radar antenna array, and outputting the frequency-echo signal to an ST observation mode receiving channel of the dual-frequency multi-mode digital receiver;
the meteor antenna control unit is used for receiving the frequency two excitation signals, distributing power and phase shifting the frequency two excitation signals, and outputting the frequency two excitation signals to the meteor radar transmitting antenna.
Preferably, the ST antenna control unit includes a power divider, a T/R switch, a phase shift unit, an antenna row/column switch, and a doppler combiner connected in sequence;
the meteor antenna control unit comprises a power distributor, a phase shift unit, a T/R switch and an antenna row/column switch which are connected in sequence.
A control method of a double-frequency atmospheric radar system comprises the following steps,
based on control analysis host computer to send control command to double-frequency multimode digital receiver, to generate double-frequency excitation signal and output it to double-frequency transmitter to amplify the double-frequency excitation signal;
transmitting the amplified double-frequency excitation signal to a radar antenna feeder for processing, and generating an echo signal; transmitting the echo signals to the dual-frequency multi-mode digital receiver, matching different observation modes according to the types of different echo signals for observation, obtaining baseband data and transmitting the baseband data to a control analysis host; and the control analysis host generates a radar data product according to the baseband data inversion.
Preferably, the amplified double-frequency excitation signal is transmitted to a radar antenna feeder for processing, and then an echo signal is generated; transmitting the echo signals to the dual-frequency multi-mode digital receiver, matching different observation modes according to the types of different echo signals for observation, obtaining baseband data and transmitting the baseband data to a control analysis host computer,
transmitting the amplified double-frequency excitation signal to a radar antenna feeder line to obtain a frequency one excitation signal and a frequency two excitation signal;
the frequency-excitation signal is output to an ST radar antenna array after being subjected to power distribution and phase shift through an ST antenna control unit, and is output to an ST observation mode receiving channel after being processed by a frequency-echo signal received by the ST radar antenna array; the ST observation mode receiving channel receives the processed frequency one echo signal, and carries out amplitude limiting, amplifying, filtering and A/D conversion to obtain a target frequency one echo signal;
the frequency two excitation signals are output to a meteor radar transmitting antenna for transmitting after being subjected to power distribution and phase shift through a meteor antenna control unit, a meteor radar receiving antenna receives the frequency two excitation signals and processes the frequency two excitation signals to generate frequency two echo signals, and the frequency two echo signals are transmitted to a meteor observation mode receiving channel; the meteor observation mode receiving channel receives the frequency two echo signals and carries out amplitude limiting, amplifying, filtering and A/D conversion to obtain target frequency two echo signals;
and processing the first echo signal of the target frequency and the second echo signal of the target frequency in parallel based on the digital signal processor, generating baseband data and transmitting the baseband data to a control analysis host.
Preferably, different observation modes are matched according to the types of different echo signals for observation, wherein the observation modes comprise an ST observation mode, a meteor observation mode and a mixed observation mode;
the process of observing through the ST observation mode comprises the steps that a control analysis host sends parameters and control instructions of the ST observation mode, the first working frequency and the scanning beam to a dual-frequency multi-mode digital receiver;
the excitation source of the dual-frequency multimode digital receiver outputs a frequency-excitation signal, a transmitter gating pulse and a dual-frequency switching signal to the dual-frequency transmitter; the excitation source outputs a Gaussian single pulse with the frequency and carries out 180-degree phase modulation between the pulses; the dual-frequency transmitter amplifies the power of the frequency-excitation signal and outputs the amplified frequency-excitation signal to an ST antenna control unit of the antenna controller;
after the frequency-one excitation signal is distributed by 1:S power, the S-path signal passes through a T/R switch and a phase shift unit, and is output to an antenna channel corresponding to the ST radar antenna array by an antenna row/column change-over switch;
the ST radar antenna array is shared by receiving and transmitting, and performs Doppler wave beam scanning detection by time-sharing transmitting a frequency-excitation signal and receiving a frequency-echo signal;
an echo signal with frequency enters an antenna row/column change-over switch of the ST antenna control unit through each antenna channel of the ST radar antenna array; synthesizing 1 path of signals based on the output S paths of signals, and outputting the signals to an ST observation mode receiving channel of the receiver;
the double-frequency multi-mode digital receiver is configured with an ST observation mode receiving channel, limits, amplifies, filters and A/D (analog-to-digital) converts the frequency echo signal to generate a radar digital radio frequency signal, and outputs the radar digital radio frequency signal to the digital signal processor;
the digital signal processor carries out digital down-conversion, matched filtering, pulse compression, pulse coherent accumulation and clutter and direct current noise suppression processing on the radar digital radio frequency signal, generates baseband data and outputs the baseband data to the control analysis host.
Preferably, the observation by the meteor observation mode includes,
the control analysis host computer sends parameter control instructions of a meteor observation mode and a working frequency II to the double-frequency multi-mode digital receiver;
the excitation source of the double-frequency multimode digital receiver outputs a frequency two excitation signal, a transmitter gating pulse and a double-frequency switching signal to the double-frequency transmitter; the excitation source outputs two-complementary Gaussian pulses, and 180-degree phase modulation is carried out between the pulses;
the dual-frequency transmitter amplifies the power of the frequency two excitation signals and outputs the amplified frequency two excitation signals to a meteor antenna control unit of the antenna controller;
the meteor antenna control unit receives the frequency two excitation signals, performs power distribution and phase shift, and outputs the signals to the meteor radar transmitting antenna for full-sky meteor trail scanning detection;
the meteor radar receiving antenna array carries out coherent reception of meteor trail echo signals in the whole sky view field and outputs M paths of frequency two echo signals to a meteor observation mode receiving channel of the receiver;
the dual-frequency multi-mode digital receiver synchronously carries out amplitude limiting, amplifying, filtering and A/D conversion on M paths of frequency two-echo signals to generate M paths of radar digital radio frequency signals, and outputs the M paths of radar digital radio frequency signals to the digital signal processor;
the digital signal processor carries out digital down-conversion, matched filtering, pulse compression, pulse coherent accumulation, clutter and direct current noise suppression processing on M paths of radar digital radio frequency signals, generates baseband data and outputs the baseband data to the control analysis host;
the control host processes the baseband data scanned in a plurality of observation periods, and the meteor distribution and the atmosphere horizontal wind field radar data product are generated in an inversion mode.
Preferably, the observation performed by the hybrid observation mode includes a first observation timing design, a second observation timing design;
the first observation time sequence is designed to arrange 1 ST mode observation period and K meteor mode observation periods in turn;
the second observation timing is designed to alternately arrange L ST-mode observation periods and K meteor-mode observation periods.
The invention discloses the following technical effects:
the invention provides a double-frequency atmospheric radar system and a control method thereof, which adopt the design methods of time-sharing double-frequency transmission, double-frequency combined antenna receiving and transmitting and multi-mode double-frequency digital receiving to realize double-frequency detection of the radar system. Compared with the existing single-frequency radar system, the double-frequency radar can respectively optimize the working frequencies of ST wind field detection and meteor detection, simultaneously meet the performance requirements of ST wind field detection and meteor detection of the system, reduce the transmission power requirement of the radar system, and improve the reliability and the cost efficiency. Meanwhile, the design thought of the invention can be applied to other composite atmospheric radars such as medium-frequency partial reflection-meteor radars and the like, and is worth of being widely popularized and applied.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a system architecture according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an ST antenna control unit under the doppler combining measurement scheme according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an ST antenna control unit under a hybrid doppler interferometry scheme according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a meteor antenna control unit according to an embodiment of the present invention;
FIG. 5 is a first observation timing diagram of a hybrid observation mode according to an embodiment of the present invention;
fig. 6 is a second observation timing diagram of a hybrid observation mode according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As known from the technical background, the existing single-frequency radar system has low meteor detection efficiency, and the power output of a transmitter must be improved to achieve the detection capability of the meteor radar of the same kind, so that a series of problems of increased system energy consumption, increased use and maintenance cost, increased failure rate, reduced reliability and the like are brought. Therefore, the invention discloses a double-frequency atmospheric radar system and a control method thereof, which adopt the design methods of time-sharing double-frequency transmission, double-frequency combined antenna receiving and transmitting and double-frequency multi-mode digital receiving, and the radar system performs ST wind field observation (frequency 1) and meteor wind field observation (frequency 2) in a time-sharing way, simultaneously meets the performance requirements of ST wind field detection and meteor detection of the system, reduces the transmission power requirement of the radar system, and improves the reliability and the cost efficiency.
As shown in fig. 1, the dual-frequency atmospheric radar system provided in the embodiment of the present invention includes: the system comprises a control analysis host, a dual-frequency transmitter, a dual-frequency multi-mode digital receiver and a Lei Datian feeder.
And the control analysis host sends parameters such as an observation mode, working frequency and the like and control instructions to the dual-frequency multi-mode digital receiver, processes multi-channel radar baseband data output by the dual-frequency multi-mode digital receiver, and performs inversion to generate a radar data product.
The dual-frequency transmitter, preferably an all-solid-state transmitter, is used for receiving the dual-frequency excitation signal from the dual-frequency multi-mode digital receiver, amplifying the power of the signal and outputting the signal to the radar antenna feeder.
The double-frequency multi-mode digital receiver mainly comprises an excitation source, a 1-path or S-path ST observation mode receiving channel, an M-path meteor observation mode receiving channel and a digital signal processor. Wherein:
the excitation source is used for generating a double-frequency excitation signal emitted by the radar system and outputting the double-frequency excitation signal to the double-frequency emitter. The excitation source adopts digital up-conversion technology, etc., can generate single pulse or phase coding pulse with various waveforms such as square wave, gaussian pulse, etc., the phase coding includes Barker code, complementary code, etc., and can also realize functions such as phase modulation (for example, 180 degree phase opposition between pulses), etc.
The receiving channel adopts a scheme of radio frequency amplification and radio frequency digital sampling, carries out amplitude limiting, low noise amplification, filtering and gain adjustment on the radar echo signal, and converts the radar echo into a digital radio frequency signal through band-pass sampling.
The ST observation mode receiving channel is combined with a specific design scheme of the ST antenna control unit, namely a Doppler combination measuring scheme or a mixed Doppler interferometry scheme, and consists of 1-path or S-path receiving channels for receiving frequency 1 echo signals, generating digital radio frequency signals and outputting the digital radio frequency signals to a digital signal processor.
The meteor observation mode receiving channel consists of M channels (M is not less than 5) for receiving the echo signals of the frequency 2, generating digital radio frequency signals and outputting the digital radio frequency signals to the digital signal processor.
The digital signal processor is used for processing the radar echo digital signals output by the ST observation mode receiving channel and the meteor observation mode receiving channel, processing the multipath receiving channel digital radio frequency signals in parallel, and carrying out digital down-conversion, matched filtering, pulse compression, pulse coherent accumulation, clutter and direct current noise suppression and other treatments on the radar echoes of various modes and waveforms to generate baseband data and output the baseband data to the control analysis host.
The Lei Datian feeder mainly comprises an antenna controller, an ST radar antenna array, a meteor radar transmitting antenna and a meteor radar receiving antenna. Wherein:
the antenna controller mainly comprises an ST antenna control unit and a meteor antenna control unit. There are two designs of ST antenna control unit, namely a "doppler combining measurement scheme" (as shown in fig. 2) and a "hybrid doppler interferometry scheme" (as shown in fig. 3). The first Doppler combination measurement scheme is characterized in that an antenna control unit consists of a 1:S power distributor, an S-path T/R switch, a phase shift unit, an antenna row/column change-over switch and a Doppler combiner, and is used for receiving a frequency 1 excitation signal from a dual-frequency transmitter, carrying out power distribution and phase shift on the frequency 1 excitation signal and outputting the frequency 1 excitation signal to an ST radar antenna array; and receiving the frequency 1 echo signals from the ST radar antenna array, combining the signals of the plurality of antenna channels, and outputting 1 echo signal to an ST observation mode receiving channel of the receiver. The second kind of mixed Doppler interferometry scheme, the aerial control unit is made up of 1:S power divider, S way T/R switch and phase shift unit, and aerial line/column change-over switch, receive the frequency 1 excitation signal from the dual-frenquency transmitter, after carrying on power division and phase shift it, output to ST radar antenna array; and receiving the frequency 1 echo signals from the ST radar antenna array, and directly outputting S-path echo signals to an ST observation mode receiving channel of the receiver.
The meteor antenna control unit receives the frequency 2 excitation signal, performs power distribution and phase shift on the frequency 2 excitation signal, and outputs the frequency 2 excitation signal to the meteor radar transmitting antenna (shown in fig. 4). If the meteor transmitting antenna is composed of 1 orthogonal antenna, the antenna control unit is composed of a 1:2 power distributor and a 2-path phase shift unit; if the meteor transmitting antenna is composed of N orthogonal antennas, the antenna control unit is composed of a 1:2N power divider and a 2N-path phase shift unit.
The ST radar antenna array is shared by receiving and transmitting, time-sharing transmitting frequency 1 excitation signals and receiving frequency 1 echo signals, and a Doppler beam scanning mode is adopted to scan and detect atmospheric turbulence by utilizing a plurality of linearly polarized radar narrow beams.
The meteor radar transmitting antenna is composed of 1 or N orthogonal antennas, receives the frequency 2 excitation signals output by the meteor antenna control unit, transmits all-sky wide wave beam radar signals, and can realize radar signal transmission in various polarization modes such as linear polarization, circular polarization and the like. If the transmitting antenna is composed of N orthogonal antennas, the transmitting antenna array can be used for optimizing the directional diagram, so that the meteor trail echo detection capability of a specific area is enhanced.
The meteor radar receiving antenna is an interference receiving array formed by M (M is not less than 5) orthogonal antennas, and receives the frequency 1 echo signal scattered by meteor trail in a full-sky coherent mode.
Correspondingly, the invention also provides a control method based on the double-frequency atmospheric radar system, which is detailed as follows:
the dual-frequency atmospheric radar system adopts a time-sharing dual-frequency detection working system to perform near-ground-20 km and 70-110km high atmospheric wind fields, and the observation mode of the radar system mainly comprises the following steps: ST observation mode, meteor observation mode, and hybrid observation mode.
(1) ST observation mode
In the ST observation mode, the radar system adopts a "doppler beam scanning" method to detect the troposphere-stratosphere atmospheric wind field. Preferably, the radar performs a 3-beam (zenith, east or west, south or north) or 5-beam (zenith, east, west, south, north) scan during each observation period, each beam being scanned for about 1 minute. There are two schemes for the reception and processing of single beam radar echoes, namely a "doppler combined measurement scheme" and a "hybrid doppler interferometry scheme".
The radar system in ST observation mode works as follows:
and the control analysis host transmits parameters such as ST observation mode, working frequency 1, scanning beam and the like and control instructions to the dual-frequency multi-mode digital receiver.
The excitation source of the dual-frequency multi-mode digital receiver outputs a frequency 1 excitation signal, a transmitter gating pulse, a dual-frequency switching signal and the like to the dual-frequency transmitter. The excitation source adopts digital up-conversion technology and other technologies, and can generate double-frequency excitation signals with various modes and waveforms. Preferably, in ST observation mode, the excitation source outputs a single pulse of frequency 1 gauss and performs phase modulation of 180 ° between pulses.
The dual-frequency transmitter amplifies the power of the frequency 1 excitation signal and outputs the amplified signal to an ST antenna control unit of the antenna controller.
Under the Doppler combination measurement scheme:
the structure of the ST antenna control unit is shown in fig. 2, after the frequency 1 excitation signal is subjected to 1:S power distribution, the S-path signal passes through the T/R switch and the phase shift unit, and finally, the S-path signal is output to an antenna channel corresponding to the ST radar antenna array through the antenna row/column change-over switch.
And the ST radar antenna array is shared by receiving and transmitting, and is used for carrying out Doppler wave beam scanning detection by time-sharing transmitting the frequency 1 excitation signal and receiving the frequency 1 echo signal.
The frequency 1 echo signal enters an antenna row/column change-over switch of the ST antenna control unit through each antenna channel of the ST radar antenna array. And the output S paths of signals pass through a phase shift unit and a T/R switch, and finally, 1 path of signals are synthesized in a Doppler combiner and output to an ST observation mode receiving channel of the receiver.
The double-frequency multi-mode digital receiver is provided with 1 ST observation mode receiving channels, limits, amplifies, filters and A/D (analog-to-digital) converts the frequency 1 echo signals to generate single-channel radar digital radio frequency signals, and outputs the single-channel radar digital radio frequency signals to the digital signal processor.
The digital signal processor carries out digital down-conversion, matched filtering, pulse compression, pulse coherent accumulation, clutter and direct current noise suppression and other treatments on the single-channel radar digital radio frequency signal, generates baseband data and outputs the baseband data to the control analysis host.
Under the hybrid Doppler interferometry scheme:
the structure of the ST antenna control unit is shown in fig. 3, after the frequency 1 excitation signal is subjected to 1:S power distribution, the S-path signal passes through the phase shift unit and the T/R switch, and finally, the S-path signal is output to an antenna channel corresponding to the ST radar antenna array through the antenna row/column change-over switch.
And the ST radar antenna array is shared by receiving and transmitting, and is used for carrying out Doppler wave beam scanning detection by time-sharing transmitting the frequency 1 excitation signal and receiving the frequency 1 echo signal.
The frequency 1 echo signal enters an antenna row/column change-over switch of the ST antenna control unit through each antenna channel of the ST radar antenna array. The output S-path signal is directly output to the ST observation mode receiving channel of the receiver after only passing through the T/R switch.
The double-frequency multi-mode digital receiver is configured with an S-path ST observation mode receiving channel, limits, amplifies, filters and A/D (analog/digital) converts the frequency 1 echo signal to generate an S-path radar digital radio frequency signal, and outputs the S-path radar digital radio frequency signal to the digital signal processor.
The digital signal processor firstly carries out digital down-conversion and digital beam forming on S paths of radar digital radio frequency signals, then carries out processing such as matched filtering, pulse compression, pulse coherent accumulation, clutter suppression and direct current noise suppression, and the like, generates baseband data and outputs the baseband data to the control analysis host.
The control host processes the baseband data of the beam scanning detection, and the radar data products such as radial wind speed, atmospheric three-dimensional wind field and the like are generated in an inversion mode.
(2) Meteor observation mode
In the meteor observation mode, the radar system adopts a method of full-sky wide beam scanning and coherent detection to detect meteor trail echo of 70-110km and acquire atmospheric wind field data. In each observation period, the radar emits wide wave beam radio waves, the receiving antenna array coherently receives meteor trail echo signals in the whole sky view field, the height and the azimuth of meteor trail are calculated, the space distribution of meteor is obtained, and further, according to the characteristic parameters such as radial drift speed, bipolar diffusion coefficient and the like of the meteor trail, environment parameters such as corresponding altitude atmosphere horizontal wind field, temperature, density and the like are calculated in an inversion mode. Preferably, the scan time per observation period is about 1 to 2 minutes.
The working flow of the radar system in the meteor observation mode is as follows:
the control analysis host transmits parameters such as meteor observation mode, working frequency 2 and the like and control instructions to the dual-frequency multi-mode digital receiver.
The excitation source of the dual-frequency multi-mode digital receiver outputs a frequency 2 excitation signal, a transmitter gating pulse, a dual-frequency switching signal and the like to the dual-frequency transmitter. The excitation source adopts digital up-conversion technology and other technologies, and can generate double-frequency excitation signals with various modes and waveforms. Preferably, in the meteor observation mode, the excitation source outputs 2 complementary-code gaussian pulses and performs 180 ° phase modulation between the pulses.
And the dual-frequency transmitter amplifies the power of the frequency 2 excitation signal and outputs the amplified frequency 2 excitation signal to a meteor antenna control unit of the antenna controller.
The meteor antenna control unit receives the frequency 2 excitation signal, distributes power and phase shifts the frequency 2 excitation signal, and outputs the frequency 2 excitation signal to the meteor radar transmitting antenna for full-sky meteor trail scanning and detection.
The meteor radar receiving antenna array carries out coherent reception of meteor trail echo signals in the whole sky view field, and outputs M paths of frequency 2 echo signals to a meteor observation mode receiving channel of the receiver.
The dual-frequency multi-mode digital receiver synchronously carries out amplitude limiting, amplifying, filtering and A/D conversion on the M paths of frequency 2 echo signals to generate M paths of radar digital radio frequency signals, and outputs the M paths of radar digital radio frequency signals to the digital signal processor.
The digital signal processor carries out digital down-conversion, matched filtering, pulse compression, pulse coherent accumulation, clutter and direct current noise suppression and other treatments on the M paths of radar digital radio frequency signals, generates baseband data and outputs the baseband data to the control analysis host.
The control host processes the baseband data scanned in a plurality of observation periods, and the radar data products such as meteor distribution, atmospheric horizontal wind field and the like are generated in an inversion mode.
(3) Hybrid observation mode
The radar system adopts a hybrid observation mode to realize the simultaneous acquisition of the near-ground-20 km and the atmospheric wind field with the height of 70-110 km.
Preferably, the mixed observation mode has the following two observation timing designs.
First, 1 ST-mode observation period and K meteor-mode observation periods are alternately arranged, as shown in fig. 5.
In the second timing, L ST-mode observation periods and K meteor-mode observation periods are alternately arranged, as shown in fig. 6.
To sum up: the invention discloses a double-frequency atmospheric radar system and a control method thereof, which adopt the design methods of time-sharing double-frequency transmission, double-frequency combined antenna receiving and transmitting and double-frequency multi-mode digital receiving to realize double-frequency detection of the radar system. Compared with the existing single-frequency radar system, the double-frequency radar can respectively optimize the working frequencies of ST wind field detection and meteor detection, simultaneously meet the performance requirements of ST wind field detection and meteor detection of the system, reduce the transmission power requirement of the radar system, and improve the reliability and the cost efficiency. Meanwhile, the design thought of the invention can be applied to other composite atmospheric radars such as medium-frequency partial reflection-meteor radars and the like.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (8)
1. A dual-frequency atmospheric radar system, comprising:
the double-frequency multi-mode digital receiver is used for generating a double-frequency excitation signal and receiving an echo signal; parallel processing the multichannel digital radio frequency signals to generate baseband data;
the control analysis host is connected with the dual-frequency multi-mode digital receiver and is used for sending parameter control instructions, processing baseband data and inverting to generate radar data products;
the dual-frequency transmitter is connected with the dual-frequency multi-mode digital receiver and is used for amplifying the dual-frequency excitation signal;
lei Datian feeder lines respectively connected with the dual-frequency multimode digital receiver and the dual-frequency transmitter and used for receiving the amplified dual-frequency excitation signals, performing power distribution and phase shift and receiving echo signals;
the Lei Datian feeder line at least comprises an antenna controller, an ST radar antenna array, a meteor radar transmitting antenna and a meteor radar receiving antenna;
the antenna controller is used for receiving the excitation signal and performing power distribution and phase shift on the excitation signal;
the ST radar antenna array is shared by receiving and transmitting, and is used for transmitting a frequency-excitation signal and receiving a frequency-echo signal in a time-sharing manner;
the meteor radar transmitting antenna is used for receiving and transmitting frequency two excitation signals;
the meteor radar receiving antenna is used for receiving the frequency two-echo signal;
the antenna controller comprises an ST antenna control unit and a meteor antenna control unit;
the ST antenna control unit is used for receiving a frequency-excitation signal, carrying out power distribution and phase shift on the frequency-excitation signal, outputting the frequency-excitation signal to the ST radar antenna array, processing a frequency-echo signal received by the ST radar antenna array, and outputting the frequency-echo signal to an ST observation mode receiving channel of the dual-frequency multi-mode digital receiver;
the meteor antenna control unit is used for receiving the frequency two excitation signals, distributing power and phase shifting the frequency two excitation signals, and outputting the frequency two excitation signals to the meteor radar transmitting antenna.
2. The dual-frequency atmospheric radar system according to claim 1, wherein,
the dual-frequency multi-mode digital receiver at least comprises an excitation source, an ST observation mode receiving channel, a meteor observation mode receiving channel and a digital signal processor;
the excitation source is used for generating a double-frequency excitation signal transmitted by the radar system and outputting the double-frequency excitation signal to the double-frequency transmitter;
the ST observation mode receiving channel is used for receiving an echo signal with frequency and carrying out amplitude limiting, amplifying, filtering and A/D conversion;
the meteor observation mode receiving channel is used for receiving the frequency two-echo signal and carrying out amplitude limiting, amplifying, filtering and A/D conversion;
the digital signal processor is used for processing the multichannel digital radio frequency signals in parallel, generating baseband data and outputting the baseband data to the control analysis host.
3. The dual-frequency atmospheric radar system according to claim 1, wherein,
the ST antenna control unit comprises a power distributor, a T/R switch, a phase shift unit, an antenna row/column change-over switch and a Doppler combiner which are connected in sequence;
the meteor antenna control unit comprises a power distributor, a phase shift unit, a T/R switch and an antenna row/column switch which are connected in sequence.
4. A control method of a double-frequency atmospheric radar system is characterized by comprising the following steps of,
based on control analysis host computer to send control command to double-frequency multimode digital receiver, to generate double-frequency excitation signal and output it to double-frequency transmitter to amplify the double-frequency excitation signal;
transmitting the amplified double-frequency excitation signal to a radar antenna feeder for processing, and generating an echo signal; transmitting the echo signals to the dual-frequency multi-mode digital receiver, matching different observation modes according to the types of different echo signals for observation, obtaining baseband data and transmitting the baseband data to a control analysis host; and the control analysis host generates a radar data product according to the baseband data inversion.
5. The method for controlling a dual-frequency atmospheric radar system according to claim 4, wherein the amplified dual-frequency excitation signal is transmitted to a radar antenna feeder for processing, and then an echo signal is generated; transmitting the echo signals to the dual-frequency multi-mode digital receiver, matching different observation modes according to the types of different echo signals for observation, obtaining baseband data and transmitting the baseband data to a control analysis host computer,
transmitting the amplified double-frequency excitation signal to a radar antenna feeder line to obtain a frequency one excitation signal and a frequency two excitation signal;
the frequency-excitation signal is output to an ST radar antenna array after being subjected to power distribution and phase shift through an ST antenna control unit, and is output to an ST observation mode receiving channel after being processed by a frequency-echo signal received by the ST radar antenna array; the ST observation mode receiving channel receives the processed frequency one echo signal, and carries out amplitude limiting, amplifying, filtering and A/D conversion to obtain a target frequency one echo signal;
the frequency two excitation signals are output to a meteor radar transmitting antenna for transmitting after being subjected to power distribution and phase shift through a meteor antenna control unit, a meteor radar receiving antenna receives the frequency two excitation signals and processes the frequency two excitation signals to generate frequency two echo signals, and the frequency two echo signals are transmitted to a meteor observation mode receiving channel; the meteor observation mode receiving channel receives the frequency two echo signals and carries out amplitude limiting, amplifying, filtering and A/D conversion to obtain target frequency two echo signals;
and processing the first echo signal of the target frequency and the second echo signal of the target frequency in parallel based on the digital signal processor, generating baseband data and transmitting the baseband data to a control analysis host.
6. The method for controlling a dual-frequency atmospheric radar system according to claim 4, wherein,
according to the types of different echo signals, different observation modes are matched for observation, wherein the observation modes comprise an ST observation mode, a meteor observation mode and a mixed observation mode;
the process of observing through the ST observation mode comprises the steps that a control analysis host sends parameters and control instructions of the ST observation mode, the first working frequency and the scanning beam to a dual-frequency multi-mode digital receiver;
the excitation source of the dual-frequency multimode digital receiver outputs a frequency-excitation signal, a transmitter gating pulse and a dual-frequency switching signal to the dual-frequency transmitter; the excitation source outputs a Gaussian single pulse with the frequency and carries out 180-degree phase modulation between the pulses; the dual-frequency transmitter amplifies the power of the frequency-excitation signal and outputs the amplified frequency-excitation signal to an ST antenna control unit of the antenna controller;
after the frequency-one excitation signal is distributed by 1:S power, the S-path signal passes through a T/R switch and a phase shift unit, and is output to an antenna channel corresponding to the ST radar antenna array by an antenna row/column change-over switch;
the ST radar antenna array is shared by receiving and transmitting, and performs Doppler wave beam scanning detection by time-sharing transmitting a frequency-excitation signal and receiving a frequency-echo signal;
an echo signal with frequency enters an antenna row/column change-over switch of the ST antenna control unit through each antenna channel of the ST radar antenna array; synthesizing 1 path of signals based on the output S paths of signals, and outputting the signals to an ST observation mode receiving channel of the receiver;
the double-frequency multi-mode digital receiver is configured with an ST observation mode receiving channel, limits, amplifies, filters and A/D (analog-to-digital) converts the frequency echo signal to generate a radar digital radio frequency signal, and outputs the radar digital radio frequency signal to the digital signal processor;
the digital signal processor carries out digital down-conversion, matched filtering, pulse compression, pulse coherent accumulation and clutter and direct current noise suppression processing on the radar digital radio frequency signal, generates baseband data and outputs the baseband data to the control analysis host.
7. The method of controlling a dual-frequency atmospheric radar system according to claim 6, wherein the process of observing by the meteor observation mode includes,
the control analysis host computer sends parameter control instructions of a meteor observation mode and a working frequency II to the double-frequency multi-mode digital receiver;
the excitation source of the double-frequency multimode digital receiver outputs a frequency two excitation signal, a transmitter gating pulse and a double-frequency switching signal to the double-frequency transmitter; the excitation source outputs two-complementary Gaussian pulses, and 180-degree phase modulation is carried out between the pulses;
the dual-frequency transmitter amplifies the power of the frequency two excitation signals and outputs the amplified frequency two excitation signals to a meteor antenna control unit of the antenna controller;
the meteor antenna control unit receives the frequency two excitation signals, performs power distribution and phase shift, and outputs the signals to the meteor radar transmitting antenna for full-sky meteor trail scanning detection;
the meteor radar receiving antenna array carries out coherent reception of meteor trail echo signals in the whole sky view field and outputs M paths of frequency two echo signals to a meteor observation mode receiving channel of the receiver;
the dual-frequency multi-mode digital receiver synchronously carries out amplitude limiting, amplifying, filtering and A/D conversion on M paths of frequency two-echo signals to generate M paths of radar digital radio frequency signals, and outputs the M paths of radar digital radio frequency signals to the digital signal processor;
the digital signal processor carries out digital down-conversion, matched filtering, pulse compression, pulse coherent accumulation, clutter and direct current noise suppression processing on M paths of radar digital radio frequency signals, generates baseband data and outputs the baseband data to the control analysis host;
the control host processes the baseband data scanned in a plurality of observation periods, and the meteor distribution and the atmosphere horizontal wind field radar data product are generated in an inversion mode.
8. The method for controlling a dual-frequency atmospheric radar system according to claim 6, wherein,
the observation through the mixed observation mode comprises a first observation time sequence design and a second observation time sequence design;
the first observation time sequence is designed to arrange 1 ST mode observation period and K meteor mode observation periods in turn;
the second observation timing is designed to alternately arrange L ST-mode observation periods and K meteor-mode observation periods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210598670.2A CN114994687B (en) | 2022-05-30 | 2022-05-30 | Dual-frequency atmospheric radar system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210598670.2A CN114994687B (en) | 2022-05-30 | 2022-05-30 | Dual-frequency atmospheric radar system and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114994687A CN114994687A (en) | 2022-09-02 |
| CN114994687B true CN114994687B (en) | 2023-05-30 |
Family
ID=83029596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210598670.2A Active CN114994687B (en) | 2022-05-30 | 2022-05-30 | Dual-frequency atmospheric radar system and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114994687B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117805742B (en) * | 2024-02-28 | 2024-05-14 | 浙江宜通华盛科技有限公司 | Phased array weather radar and design method of scanning mode thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE112012006085T5 (en) * | 2012-03-23 | 2015-03-19 | Public Corporation "Nauchno-Proizvodstvennoe Obedinenie "Lianozovskiy | Meteorological Doppler radar |
| CN105068055B (en) * | 2015-07-28 | 2017-11-10 | 武汉大学 | The control method of the digital linear frequency modulation radar of double frequency |
| CN107643522B (en) * | 2017-09-19 | 2020-07-07 | 中国电子科技集团公司第三十八研究所 | Dual-band dual-polarization satellite-borne cloud and rain measurement radar system |
| CN110609287B (en) * | 2018-06-14 | 2021-06-08 | 中国科学院国家空间科学中心 | Double-frequency radar scatterometer and method for simultaneously measuring sea surface wind field and flow field |
| CN111045013A (en) * | 2019-12-10 | 2020-04-21 | 中国科学院国家空间科学中心 | Multi-frequency differential absorption radar system for measuring sea surface air pressure |
| CN112698313A (en) * | 2020-11-10 | 2021-04-23 | 南京恩瑞特实业有限公司 | Distributed meteor radar system and detection method thereof |
-
2022
- 2022-05-30 CN CN202210598670.2A patent/CN114994687B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114994687A (en) | 2022-09-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7151483B2 (en) | System and method for concurrent operation of multiple radar or active sonar systems on a common frequency | |
| US7355546B2 (en) | Polarization and frequency diverse radar system for complete polarimetric characterization of scatterers with increased scanning speed | |
| CN110146892B (en) | Dual-polarization radar | |
| CN103064080B (en) | Target guiding radar with continuous waves | |
| CN110058219B (en) | MIMO harmonic radar | |
| CN109959909B (en) | Single-transmitting double-receiving RCS (remote control system) testing system and testing method for circular polarization testing | |
| CN108008346A (en) | A kind of radar system based on two unit time-modulation arrays | |
| CN111175708B (en) | Automatic gain control system and method for active phase scanning ground reconnaissance radar | |
| CN104133209B (en) | The Integrative Radar system and method for target search and meteorological detection | |
| CN107064956A (en) | A kind of ground Terahertz cloud detection radar system and its detection method | |
| CN108828546B (en) | Space-based multi-channel moving target radar receiving and processing system and method | |
| JP6462365B2 (en) | Radar apparatus and radar signal processing method thereof | |
| CN114994687B (en) | Dual-frequency atmospheric radar system and control method thereof | |
| CN106772335A (en) | Towards the active alien frequencies receiving type microwave radar systems of large scale structure deformation monitoring | |
| CN115308707B (en) | Low-frequency expansion measuring device and method for indoor RCS test field | |
| Anajemba et al. | Efficient switched digital beamforming radar system based on SIMO/MIMO receiver | |
| US20080007449A1 (en) | Radar Sensor | |
| CN113841066A (en) | Coherent multistatic radar system, in particular for use in a vehicle | |
| CN115267771A (en) | Satellite-borne Ka-band SAR system and on-orbit imaging working method thereof | |
| CN105699968B (en) | Naval vessel nondestructive detection system and method | |
| CN114994617B (en) | Double-frequency all-solid-state transmitter for atmospheric radar | |
| CN219435042U (en) | K-band phased array radar and security equipment | |
| RU112775U1 (en) | MULTI-FREQUENCY RADAR STATION | |
| CN117233701A (en) | Radar radio frequency receiving method and radar radio frequency system adapting to strong clutter environment | |
| CN116165623A (en) | Large airspace coverage phased array radar system and detection method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |