CN102590792B - L-wave-band shore-based sea clutter observation system based on vector network analyzer - Google Patents
L-wave-band shore-based sea clutter observation system based on vector network analyzer Download PDFInfo
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Abstract
The invention discloses an L-wave-band shore-based sea clutter observation system based on a vector network analyzer. The system comprises the vector network analyzer, a power amplifier, a low noise amplifier, a transmit-receive antenna and a master control computer. The vector network analyzer is transmit-receive signal equipment and is used to emit a frequency-stepping continuous wave signal with a specified parameter under control of the master control computer. After being amplified by the power amplifier, the signal is radiated to a sea area to be measured through the transmit-receive antenna. An echo signal is received by the transmit-receive antenna and enters into the vector network analyzer after a signal-to-clutter ratio is increased through the low noise amplifier. The vector network analyzer is also used to arrange a proper intermediate-frequency bandwidth under the control of the master control computer and carries out time domain windowing, calculation and processing to the echo signal. Sea clutter data can be obtained. By using the technical scheme of the invention, long distance detection can be performed under low radiation power; the detection with a small grazing angle and high resolution can be realized; system performance is stable and an automation degree is high.
Description
Technical field
The present invention relates to radar clutter technical field of measurement and test, relate in particular to a kind of L-band bank base sea clutter recording geometry based on vector network analyzer.
Background technology
Sea background clutter is impact and the particularly principal element of low elevation angle detection radar, the performance of airborne and spaceborne head-down radar target detection performance of restriction radar.The extra large clutter causing due to the ANOMALOUS VARIATIONS on sea in land-sea interface region can cause radar false alarm greatly to increase.The measurement result that need to collect under abundant various Parameter Conditions the understanding of extra large clutter is analysed in depth.
In order to develop advanced capabilities radar, improve target detection ability, from five sixties of eighties of last century, the extra large clutter that various countries utilize vehicle-mounted scatterometer, airborne radar and land-based radar system to carry out under various ways, multiband and particular surroundings is measured, and carries out the research such as statistical property of extra large clutter.After the nineties, along with developing rapidly and the variation of military requirement of airborne radar, a lot of clutter surveying works are more pointed, and clutter measurement means is also tending towards variation, and to multiband, little grazing angle, High Range Resolution expansion.Mostly state's inland sea clutter theoretical research, in view of lacking the support of effective experimental data, is simulation calculation, and extra large Clutter modeling precision is not high, and the engineering practicability of achievement in research is poor.Experiment measuring comprises that bank base is measured and airborne radar is measured, and airborne measurement is subject to the restriction in Measuring Time place, and measuring data sample is few, and measurement result difference is also very large, and systematicness not.In view of lacking observation method, the research work based on measured data is less, taking bank based platform as basic extra large clutter long-term observation platform and the applied research of the extra large clutter mean value model based on measured data, all also in the starting stage.Particularly, in recent years due to the appearance of Stealthy Target and low latitude ultra-low altitude penetration, the research of little grazing angle and high resolving power sea clutter becomes an important directions, and owing to lacking effective observation method, little grazing angle, high resolving power sea clutter data lack relatively.
According to the difference of the form of transmitting, Clutter Measurement Radar has different systems, and continuous wave is basic configuration, but owing to not modulating, so cannot determine distance.Pulsed radar is determined range information by the time delay of measuring between transponder pulse and received pulse, but emissive power is larger.Millimeter Wave Stepped-Frequency High Resolution Radar utilizes signal source transmitting jump frequency to substitute frequency sweep mode, can increase range resolution, and shortcoming is to increase the complicacy of signal source and the stability requirement of whole bandwidth inner part.
In addition, set up bank base sea clutter long-established station and can on the mountain top of bordering on the sea or high platform, build, but relate to the engineering construction such as civil engineering, water power problem, the cycle of building a station is long and cost is higher, implements difficulty relatively.In addition can be setting up on skyscraper nearby of sea, by on-the-spot investigation, the suitable tall building roof of the condition of choosing, as setting for this platform, can be simplified many problems on engineering construction greatly, and shortcoming is that radiation power can produce radiation pollution to surrounding environment when larger.So ensureing under radar performance prerequisite, also need to reduce radiation around, test macro should keep detection range far away, possesses again less emissive power as far as possible.And long-term observation also has higher requirements to aspects such as test macro stability, automaticities.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of L-band bank base sea clutter recording geometry based on vector network analyzer, and this system can be carried out long-range detection under low radiation power, realizes little grazing angle high-resolution and surveys.
For solving the problems of the technologies described above, the present invention is based on the L-band bank base sea clutter recording geometry of vector network analyzer, mainly comprise vector network analyzer, power amplifier, low noise amplifier, dual-mode antenna and main control computer;
Wherein, described vector network analyzer is signal sending and receiving equipment, for produce the frequency step continuous wave signal of designated parameter under described main control computer control, this signal is radiated region, sea to be measured by described dual-mode antenna after described power amplifier amplifies; Echoed signal receives through described dual-mode antenna, and enter described vector network analyzer after improving signal to noise ratio by described low noise amplifier, described vector network analyzer also for arranging suitable intermediate-frequency bandwidth under main control computer control, and echoed signal is carried out obtaining extra large clutter data after time-domain windowed and computing, main control computer records, analyzes and manage the extra large clutter data that obtain.
Further, described vector network analyzer possesses signal and transmits and receives function, and wherein, the intermediate frequency of described vector network analyzer (IF) bandwidth is determined as follows:
According to transmitted signal bandwidth and the maximum measuring distance of calculating of counting, determine the qualified scope of counting according to transmitted signal bandwidth and the distance range that will measure;
More than count the sweep time corresponding different with the various combination between two of intermediate-frequency bandwidth, find out and meet intermediate-frequency bandwidth corresponding while being less than 1/4 Periods sweep time, as the intermediate-frequency bandwidth of described vector network analyzer.
Further, described dual-mode antenna separates and all adopts single-offset parabolic reflector antenna, antenna mount alternate orientation-pitching type turntable type mounting, azimuth rotating platform forms tray type structure by constructed of aluminium part, its upper end connects pitching part with bolt, lower end is connected with antenna mounting platform with bolt, and pitching driving box is placed in pitching cylinder interior, is output as the annular wheel being connected with cylinder.
Further, orientation drive motor and pitching drive motor adopt ac three-phase asynchronous motor, in order to drive orientation, pitch axis to rotate, select sine and cosine resolver to be arranged on respectively on azimuth axis of antenna, pitch axis, in order to micro-change of sensed orientation, luffing angle; Orientation, pitch axis are to hardware limit device is housed respectively.
Further, main control computer is also for by arranging measure batch parameter, setting measurement order also arranges Petri Nets and realizes extra large clutter and automatically measure, automatically measurement parameter setting comprises multiple measurement under same parameters measurement in repeatedly duplicate measurements of same parameters, same time period, the interior different parameters measurement of same time period and above three kinds of patterns, and measurement parameter is deposited after verification in to automatic measurement parameter file, after measurement, measurement data is put in storage automatically, and artificial warehouse-in mode is provided simultaneously.
Further, main control computer also, for by the running of ethernet line Long-distance Control scope, adopts Mutli-thread Programming Technology, utilizes hub and communication server to control respectively and vows that network parameters setting and antenna rotate, launch and collection.
Further, described main control computer also comprises data analysis module, described data analysis module in conjunction with ocean environment parameter to described extra large clutter data analysis, comprise mean value model coupling and amplitude distribution matching.
Further, the L-band bank base sea clutter recording geometry based on vector network analyzer of the present invention also comprises power amplifier monitoring means and temperature monitoring unit; Wherein, described power amplifier monitoring means is used for monitoring through described power amplifier is after treatment and transmits; Described temperature monitoring unit is for detection of the working temperature of rack.
Further, described vector network analyzer adopts UPS (uninterrupted power source) power supply, and described power amplifier adopts switching power supply power supply, and described power amplifier monitoring means and temperature monitoring unit adopt Switching Power Supply power supply.
Further, the L-band bank base sea clutter recording geometry based on vector network analyzer of the present invention also comprises supervisory computer, and described supervisory computer monitors the rotary state of described dual-mode antenna by camera, and monitors sea state.
The present invention has broken through the gordian techniquies such as the clutter observation of frequency step continuous wave system bank base sea, the automatic measurement of extra large clutter, utilize the long-term Continuous Observation of the deployable extra large clutter bank based platform of the present invention, for extra large noise performance research accumulation mass data, especially the clutter data in land-sea interface region, and then process with target detection theoretical support and technical support are provided for radar system design, signal.Compared with prior art, the present invention has following beneficial effect:
1, proportion stepping continuous wave system of the present invention builds bank base L-band sea clutter long-term observation system, utilize vector network analyzer (be called for short and vow net) as R-T unit, consider sweep time and measure the method for counting by reducing intermediate-frequency bandwidth compromise, can under low emissive power, keep detection range far away, can be in little grazing angle work, and there is the high-resolution that is less than 1m, system performance is stable, thereby being easy to launch bank base measures for a long time, obtain the L-band high resolving power sea clutter data in conjunction with land-sea interface region marine environment feature, for clutter statistical characteristics, the researchs such as mean value model applicability.
2, realized the remote control and surveillance of equipment.By reasonable disposition equipment interface, only need an ethernet line to realize the control of main control computer to scope and circuit.Adopt many interfaces and Mutli-thread Programming Technology, the co-ordination and the equipment state that have realized opertaing device monitor.
3, the automatic measurement of extra large clutter and effectively management have been realized.Software for Design adopts active data storage format, Parameter File configuration mode, mode of operation and logical operation, and design error failure restore funcitons has been realized the automatic Observation of extra large clutter.Possess the functions such as correlation inquiry to extra large clutter data and marine environment data, interpolation, deletion, backup, demonstration, improve data-handling efficiency, and be provided with the data analysis module of mean value model coupling and amplitude distribution matching, intuitively for noise performance in-depth analysis and data selection provide reference.
Brief description of the drawings
The radiation power estimation area schematic diagram that Fig. 1 (A) is the embodiment of the present invention;
The radiation power estimation density schematic diagram that Fig. 1 (B) is the embodiment of the present invention;
Fig. 2 is the system software workflow schematic diagram of the embodiment of the present invention;
Fig. 3 is the software design block diagram of the embodiment of the present invention;
Fig. 4 is that subsystem fundamental diagram is watched in the sky of the embodiment of the present invention;
Fig. 5 is data processing subsystem principle of work and the connection layout of the embodiment of the present invention;
Fig. 6 is that the breakpoint of the embodiment of the present invention recovers event schematic flow sheet;
Fig. 7 is the automatic warehouse-in schematic flow sheet of the embodiment of the present invention;
Fig. 8 is the artificial warehouse-in schematic flow sheet of the embodiment of the present invention;
Fig. 9 is extra large clutter data processing and the analysis process figure of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, does not limit the present invention.
The present invention utilizes frequency step continuous wave system, adopt narrower intermediate-frequency bandwidth to reduce noise gate, improve dynamic range, under the prerequisite that keeps long-range detection performance, reduce emissive power, utilize broadband saltus step waveform to obtain High Range Resolution, survey thereby realize the little grazing angle high resolving power of bank base.
The present invention is based on and vow that net builds, built-in signal source, can launch the frequency step continuous wave signal under designated parameter, and stable performance.The L-band bank base sea clutter recording geometry that the present invention is based on vector network analyzer is mainly made up of antenna servo subsystem, data processing subsystem two large divisions.It is watched subsystem and comprises dual-mode antenna, antenna mount unit, servosystem and connection cable etc.Dual-mode antenna comprises single biasing reflecting surface, feed source bracket and feed; Antenna mount unit comprises orientation combination and pitching combination; Servosystem comprises antenna control unit and antenna driver element; Connection cable comprises the signal cable between servocontrol cable and antenna control unit and the antenna driver element between antenna control unit and antenna driver element and antenna mount.Data processing subsystem comprises transceiver, control and data analysis facilities.Transceiver comprises vows net, power amplifier, low noise amplifier, amplifier power supply, uninterrupted power source UPS, Switching Power Supply, polarization switch, hub, communication server, power amplifier and temperature monitoring unit, switch drive unit, microwave cable etc.Control with data analysis facilities and comprise main control computer, supervisory computer, data-carrier store etc.
The L-band bank base sea clutter recording geometry groundwork flow process that the present invention is based on vector network analyzer is: vow that net receives the setting parameter of system software in main control computer, frequency step continuous wave signal under transmitting designated parameter, vow the signal source transmitting jump frequency in net, frequency increases progressively by Δ f (frequency interval) interval, the total bandwidth that transmits B=N × Δ f (N is discrete frequency number), utilizes broadband saltus step waveform can obtain High Range Resolution.Power amplifier is radiated region, sea to be measured by emitting antenna after signal is amplified; adopt transmitting-receiving separate antenna; isolation between increase transceiver channel is to 50dB left and right; dual-mode antenna main beam is aimed at region to be measured; echoed signal is passed through low noise amplifier through receiving antenna; low noise amplifier amplifies faint echoed signal, improves signal to noise ratio, and the saturated function of strong signal of low noise amplifier plays a protective role to vowing net receiver simultaneously.After letter after amplification, enter arrow net, suitable intermediate-frequency bandwidth is set under main control computer control and echo data is carried out obtaining extra large clutter data after time domain conversion and processing.Main control computer record, the extra large clutter data of analyzing and managing collection.The expansion of dual-mode antenna in the course of the work, collection, orientation, pitch rotation are realized by main control computer Long-distance Control control servosystem.Main control computer Real-Time Monitoring power amplifier state, machine in-cabinet temperature, control polarization switch.Supervisory computer monitors antenna rotary state by camera, and the human intervention measure that is in an emergency can further ensure antenna equipment safety, monitors sea state simultaneously.Between scope and main control computer, be only connected with an ethernet line, be beneficial to Long-distance Control wiring, then by hub and communication server, utilize Mutli-thread Programming Technology, control respectively vowing the parts such as net, servosystem, monitoring means, polarization switch, real-time acquisition and display signal, and monitor each equipment running status.
Land clutter measurement is compared in sea clutter measurement needs farther detection range.Utilize formula (1) estimation detection performance, maximum detectable range is:
Wherein: P
trepresent emissive power;
G
2represent round trip radar antenna gain;
G
2 frepresent round trip antenna direction sex factor;
Λ represents wavelength;
σ
0represent backscattering coefficient;
φ
arepresent antenna bearingt beam angle;
φ
brepresent antenna pitching beam angle;
S
minrepresent receiver minimum detectable level;
SNR
minrepresent minimum signal to noise ratio;
L represents two-way radar system loss.
For the radiation pollution that reduces to bring to surrounding environment, can not excessive increase emissive power, the present invention reduces minimum detectable level and improves the detection range of radar by improving the receiver sensitivity of radar system.According to the principle of work of vowing net, by reducing the intermediate-frequency bandwidth of system, reduce background noise, and then improve receiver sensitivity.
Reduce on the other hand intermediate-frequency bandwidth will increase vow net sweep time, for guaranteeing authenticity and the validity of extra large clutter measurement data, between intermediate-frequency bandwidth, sweep time and measurement are counted compromise consider, parameter is chosen according to the following steps:
1) first according to transmitted signal bandwidth and the maximum measuring distance of calculating of counting, determine the qualified scope of counting according to transmitted signal bandwidth and the distance range that will measure.
2) above counting the sweep time corresponding different with the various combination between two of intermediate-frequency bandwidth, finds out and meets intermediate-frequency bandwidth parameter corresponding while being less than 1/4 Periods sweep time.
Reality can add that time delay, impact obtained according to IF bandwidth parameter by measuring distance.With radar power frequency rate 1.35GHz, bandwidth 200MHz, Periods 3.9s, receiver IF bandwidth 2kHz～20kHz is example, corresponding actual maximum measuring distance is 1.2～6.6km.
In addition take following measures for increasing detection range to vowing net: take the measure reduction receiver noise level such as average, level and smooth, delete useless trace, disconnect useless mark, disconnect some additional functions such as limit test function, simultaneously by closing the demonstration of vowing net to improve sweep velocity.
Utilize formula (2) to carry out radiation power estimation, certain test platform of having applied taking reality of the present invention is example, little grazing angle work, 1.4 ° of radar beam nutations, the high 90m of platform, land-sea interface place and the about 1.5km of platform horizontal range, emissive power is 90W, estimation area and estimation radiosity are as shown in Figure 1.Can find out from estimation result, radiation power is 0.012W/m to the maximum
2, much smaller than national Electromagnetic Radiation Standards 0.4W/m
2.
Wherein: P
tfor transmitting antenna power, G
tfor transmitter antenna gain (dBi), G
ffor emitting antenna directional factors, the distance that R is any point, D is the power density apart from radar R rice any point at a distance.
In realizing remote little grazing angle and surveying, utilize broadband waveform to realize high-resolution, vow between net response resolution and frequency span, window selection and have different corresponding relations, be inverse ratio with survey frequency span, change along with window difference.Select tape of the present invention is logical to be impacted, measure for round trip, and bandwidth 200MHz, minimum resolution can reach [1/2 × (1.20/ band width)] × light velocity=0.9m.
For ensureing that extra large clutter long-term observation carries out in order, the present invention designs autorun, is realized by main control computer control.Built-in system software is the tie of connected system functions, and as shown in Figure 2, after startup, first Long-distance Control antenna turns to azimuth pitch angle to be measured to software workflow, then arranges and vows net correlation parameter, and controlling transmits carries out clutter measurement.Echoed signal shows with the form of frequency domain figure, then controls and vows that net carries out data transformation, after respective handling is calculated, shows scattering coefficient figure, finally stores clutter data and imports database.In clutter measuring process, show in real time power amplifier condition curve, on the one hand can the work of artificial judgment power amplifier whether normal, reduce the impact of clutter being measured by power amplifier instability by measures such as data fittings on the other hand.Simultaneously harvester in-cabinet temperature, and be shown in the main interface of software, takes necessary measure to solve when too high with the working temperature of convenient rack in time.System software is made up of extra large clutter observation Control & data acquisition module, data management module, system management module, data analysis module.Design framework as shown in Figure 3.
Below in conjunction with accompanying drawing, antenna servo subsystem (be called for short sky and watch subsystem) and the data processing subsystem of the L-band bank base sea clutter recording geometry that the present invention is based on vector network analyzer are described in further details.
1) subsystem is watched in sky
It is watched subsystem and comprises dual-mode antenna, antenna mount unit, servosystem and connection cable etc.Antenna completes the transmitting to polarized signal and the reception to the linear polarization signal from space; Antenna mount unit provides the platform of installation for antenna; Servosystem gathers the information such as antenna bearingt, pitching shaft angle, rotates according to exterior guiding instruction or this control operation driven antenna mounting, changes controlling antenna wave beam to point; Connection cable comprises the compositions such as the signal cable between servocontrol cable and antenna control unit and the antenna driver element between antenna control unit and antenna driver element and antenna mount.
Above-mentioned dual-mode antenna is made up of single offset parabola reflecting body, feed source bracket, Feed Horn.Reflecting body is made up of reflecting surface and backrest.Feed source bracket adopts ladder-shaped support structure.Feed adopts square loudspeaker, and horn feed can reach good coupling and isolation.
Above-mentioned antenna mount unit alternate orientation-pitching type turntable type mounting.Azimuth axis adopts traffic cycle form, can ± 180 ° of rotations.Pitching drive system is placed on orientation rotating disk, and relatively independent, the compact conformation of moving, axial dimension are little, are convenient to work, storage and transport etc.
Orientation part is synchronous by azimuth rotating platform, bearing, orientation, orientation support etc. forms, the weight of whole antenna passes to chassis, orientation by azimuth rotating platform by bearing, chassis, orientation is arranged on the orientation support that is welded into body structure, is finally fixed on antenna mounting platform.Azimuth rotating platform forms tray type structure by special processing constructed of aluminium part, and its upper end connects pitching part with bolt, and lower end is connected with antenna mounting platform with bolt.This version be can't see the parts such as orientation drives, orientation is synchronous, profile is simple and direct attractive in appearance, is only a disk.Pitching part is made up of parts such as pitching cylinder, pitching bearing, pitching drivings, and pitching driving box is placed in cylinder interior, is output as an annular wheel being connected with cylinder, and cylinder is only seen in outside, and profile is succinct.Antenna system is separately equipped with hardware limit device, ensures the safe and reliable of antenna movement.
Above-mentioned servosystem is made up of antenna control unit and antenna driver element, and peripheral relevant auxiliary element comprises angular transducer, driving element, safety guard etc.Shaft angle sensitive element is that binary channels sine and cosine is revolved change transmitter, sine and cosine is revolved and become that to carry out 400Hz excitatory, the output of its sine, cosine winding is sinusoidal wave after R, C phase shift, and sinusoidal wave phase place and corner are proportional, by a set of phase discriminator and software programming, corner are become to digital quantity.Orientation and pitching driving element are selected frequency control, threephase asynchronous, can meet outwork requirement for environmental conditions.
It watches System Working Principle as shown in Figure 4, and antenna control unit is servocontrol core, moves by control antenna driver element, completes various antennas and drives function; Antenna driver element provides power for orientation drive motor and pitching drive motor, and driven antenna is rotated; Orientation drive motor and pitching drive motor adopt ac three-phase asynchronous motor, in order to drive orientation, pitch axis to rotate; Select sine and cosine resolver to be arranged on respectively on azimuth axis of antenna, pitch axis, in order to micro-change of sensed orientation, luffing angle; Orientation, pitch axis, to the safety guards such as hardware limit are also housed respectively, ensure the safe and reliable of motion; Antenna control unit is by RS-485 bus and main control computer communication.
2) data processing subsystem
Data processing subsystem comprises parts such as vowing net, power amplifier, low noise amplifier, amplifier power supply, UPS, Switching Power Supply, polarization switch, hub, communication server, power amplifier monitoring means, temperature monitoring unit, switch drive unit, main control computer, as shown in Figure 5.
Above-mentioned arrow net is selected Agilent PNA series network analyzer E8362B, and test signal is converted to time domain, by the echoed signal windowing in the distance range that hope is obtained, removes the interference of ambient noise signal, improves signal to noise ratio (S/N ratio); Reception signal is directly connected to and vows net front panel wire jumper, reduce minimum received signal power level, the dynamic range of net is vowed in expansion.Utilize the signal source of vowing that net is inner integrated, can meet transmits arranges demand.
Above-mentioned each ingredient is taked different power supply modes, to the amplifier power supply of power amplifier configure dedicated, selects DHD3 type switching power supply, for the Switching Power Supply of constant voltage mode, the output of Gong San road, the output of Shi Ge road is separate, do not interfere with each other, and electrical isolation.Adopt UPS to aim at and vow net power supply, by increasing by a Battery pack, guarantee to vow net work half an hour under powering-off state more than, so that staff takes urgent measure, net is vowed in protection to greatest extent.Adopting Switching Power Supply is that power amplifier monitoring means, temperature monitoring unit and switch drive unit power up, and also powers up to low noise amplifier simultaneously.
Above-mentioned polarization switch adopts the wide band switching of single-pole double-throw (SPDT) coaxial fitting.Power amplifier data monitoring circuit board, polarization switch drive circuit board are packaged in the control enclosure of a sealing.
Above-mentioned hub is connected by ethernet line between netting with main control computer, the communication server and arrow; Between power amplifier and emitting antenna termination two long microwave cables for transmitting, to adapt to two polarization of H and V of emitting antenna; Signal receiving end uses low loss cable, between polarization switch and low noise amplifier, between low noise amplifier and arrow net receiving port, between polarization switch polarization different from receiving antenna feed and vow between net emission port and power amplifier input port that all the shorter microwave cable of employing is connected, microwave cable is selected low-loss, is had the cable of filter function.
Net transmitting specification signal is vowed in main control computer control, is transferred to emitting antenna through power amplifier amplifying emission signal by low loss cable; Echoed signal receives through dual-mode antenna, and enter vector network analyzer after improving signal to noise ratio by low noise amplifier, vector network analyzer arranges suitable intermediate-frequency bandwidth under main control computer control, and echoed signal is carried out obtaining extra large clutter data after time-domain windowed and computing, main control computer records, analyzes and manage the extra large clutter data that obtain, and completes the once task of receiving and dispatching.Meanwhile, transmitting of ingoing power amplifier is coupled out a road signal, by power amplifier monitoring means, monitoring result passed to main control computer, and real time monitoring transmits.By the working temperature of temperature monitoring unit monitoring rack, when too high with the working temperature of convenient rack, take in time necessary measure to solve.
Main control computer is by the running of ethernet line Long-distance Control scope, adopt Mutli-thread Programming Technology, utilize hub and communication server to control respectively and vow that network parameters setting and antenna rotate, launch and collection, and Real-Time Monitoring power amplifier state, machine in-cabinet temperature, polarization switch controlled.
Main control computer built-in system software, is divided into control and data acquisition, data management, data analysis and four modules of system management, below system software modules is described in further details.
A) control and data acquisition module
Mainly complete the control of antenna servo and vow network data collection.First, as required antenna is turned to the position of appointment, and the state of real time monitoring antenna servo, guarantee that instrument normally works.Then, Long-distance Control is vowed net work, preserves the data in measuring process, after to the data processing gathering, deposits file in.
The present invention, by measure batch parameter is set, carries out automatically measuring and real-time display state, records and store data.Due to the parameter numerous (polarization, angle, bandwidth, measuring distances etc.) that radar sea clutter is measured, relate to antenna and rotate and choose with radar parameter, therefore batch processing parameter, setting measurement order and set up standby fault recovery function.Automatically measurement parameter setting comprises multiple measurement under same parameters measurement in repeatedly duplicate measurements of same parameters, same time period, the interior different parameters measurement of same time period and above three kinds of patterns, preserve and measure task parameters, by arrange parameter display in list control, can to arrange parameter add, deletion action, the parameter arranging deposits automatic measurement parameter file in after verification, and after measurement, measurement data is put in storage automatically.
For ensureing each integrality of measuring, breakpoint restore funcitons is set, the flow process of its event is as shown in Figure 6.It is in the process of automatically measuring that breakpoint recovers, for some reason (power down, computer corruption, system crash etc.) cause normal measuring process automatically to be interrupted, must restarting systems after, could continue measurement normally.After startup system, first read and measure the recorded information that the last success of journal file is measured, that then reads parameter configuration files arrangement needs measurement parameter for the last time, and both compare, if information is identical, when explanation goes wrong, arrange to need the task of test to complete; If not identical, continue to measure from breakpoint, thereby realize breakpoint restore funcitons.
B) data management module
The mass data measuring is effectively managed, contribute to improve the efficiency that late time data is analyzed.The present invention has designed data management module, adopt ADO (the Active Data Object) database technology of Microsoft, using Microsoft Access as background data base, manage extra large clutter sampled data and corresponding radar state parameter, weather conditions data etc., comprise data information management, the test data management etc. such as database maintenance, radar state and meteorology.
The functions such as automatic warehouse-in, artificial warehouse-in, inquiry, amendment, increase, deletion are provided for the warehouse-in of data, and as shown in Figure 7, the treatment scheme of artificial warehouse-in as shown in Figure 8 for the treatment scheme of wherein automatically putting in storage; In order to ensure the safety of database, the attribute that backup is provided, recovers, arrange database password and database is set (for example starts system, the attribute of database change into show and read-write, log off, the attribute of database change into hide and read-only) etc. function.
C) data analysis
Data to test are carried out basic data analysis, and contributing to provides reference for concrete application.Data analysis module combines ocean environment parameter data, realizes further analyzing and processing on extra large clutter data observation basis, comprises mean value model coupling and amplitude distribution matching two parts.Specific implementation process is gray-scale map when first the extra large clutter data to different bandwidth are drawn sky, in gray-scale map, extract the region that signal to noise ratio is higher, get rid of abnormal strong point signal and strong point movable signal, analyze scattering coefficient average characteristics and and amplitude statistical distribution characteristic.Average characteristics analysis comprises draws scattering coefficient with grazing angle change curve, comprises each quantile value, and scattering coefficient average is mated to such as GIT model, TSC model etc. with typical average scattering coefficient model.The same range gate Continuous Observation of a certain angle data are selected in amplitude statistics analysis, estimate as multiple distributed model parameters such as rayleigh distributed, lognormal distribution, Weibull distribution and K distributions, and draw statistical distribution histogram by the parameter of estimating, provide fitting result chart, Y coordinate axis shows by logarithmic scale.Treatment scheme as shown in Figure 9.This module is mainly the realization of theoretical algorithm, so adopt the way of realization of class, the whole bag of tricks of data analysis completes with class members's functional form.
D) system management
System management comprises that subscriber information management and system arrange two parts.Subscriber information management is the different different rights of using of user assignment.Mainly user is divided into two grades, system manager and general user, arrange respectively different authorities.System setting function comprises the configuration of system path, the configuration of measurement pattern, the configuration of data loading mode, and native system can be moved by the requirement of hommization.Comprise the establishment of ephemeral data storing directory simultaneously.
Although be example object, the preferred embodiments of the present invention are disclosed, it is also possible those skilled in the art will recognize various improvement, increase and replacement, therefore, scope of the present invention should be not limited to above-described embodiment.
Claims (8)
1. the L-band bank base sea clutter recording geometry based on vector network analyzer, it is characterized in that, mainly comprise vector network analyzer, power amplifier, low noise amplifier, dual-mode antenna, main control computer, power amplifier monitoring means and temperature monitoring unit;
Wherein, described vector network analyzer is signal sending and receiving equipment, for produce the frequency step continuous wave signal of designated parameter under described main control computer control, this signal is radiated region, sea to be measured by described dual-mode antenna after described power amplifier amplifies, simultaneously, transmitting of ingoing power amplifier is coupled out a road signal, by power amplifier monitoring means, monitoring result is passed to main control computer, and reduce the impact on clutter measurement by power amplifier instability by data fitting, echoed signal receives through described dual-mode antenna, and enter described vector network analyzer after improving signal to noise ratio by described low noise amplifier, described vector network analyzer also for arranging suitable intermediate-frequency bandwidth under main control computer control, select tape is logical to be impacted, and echoed signal is carried out obtaining extra large clutter data after time-domain windowed and computing, main control computer carries out record to the extra large clutter data that obtain, analyze and management, described temperature monitoring unit is for monitoring the working temperature of rack,
Wherein, the intermediate-frequency bandwidth of described vector network analyzer is determined as follows: according to transmitted signal bandwidth and the maximum measuring distance of calculating of counting, determine the qualified scope of counting according to transmitted signal bandwidth and the distance range that will measure; More than count the sweep time corresponding different with the various combination between two of intermediate-frequency bandwidth, find out and meet intermediate-frequency bandwidth corresponding while being less than 1/4 Periods sweep time, as the intermediate-frequency bandwidth of described vector network analyzer.
2. the L-band bank base sea clutter recording geometry based on vector network analyzer as claimed in claim 1, it is characterized in that, described dual-mode antenna separates and all adopts single-offset parabolic reflector antenna, antenna mount alternate orientation-pitching type turntable type mounting, azimuth rotating platform forms tray type structure by constructed of aluminium part, and its upper end connects pitching part with bolt, and lower end is connected with antenna mounting platform with bolt, pitching driving box is placed in pitching cylinder interior, is output as the annular wheel being connected with cylinder.
3. the L-band bank base sea clutter recording geometry based on vector network analyzer as claimed in claim 2, it is characterized in that, orientation drive motor and pitching drive motor adopt ac three-phase asynchronous motor, in order to drive orientation, pitch axis to rotate, select sine and cosine resolver to be arranged on respectively on azimuth axis of antenna, pitch axis, in order to micro-change of sensed orientation, luffing angle; Orientation, pitch axis are to hardware limit device is housed respectively.
4. the L-band bank base sea clutter recording geometry based on vector network analyzer as described in claims 1 to 3 any one, it is characterized in that, main control computer is also for by arranging measure batch parameter, setting measurement order also arranges Petri Nets and realizes extra large clutter and automatically measure, automatically measurement parameter setting comprises repeatedly duplicate measurements of same parameters, in the same time period, same parameters is measured, multiple measurement under different parameters measurement and above three kinds of patterns in the same time period, and measurement parameter is deposited after verification in to automatic measurement parameter file, after measurement, measurement data is put in storage automatically, artificial warehouse-in mode is provided simultaneously.
5. the L-band bank base based on vector network analyzer sea clutter recording geometry as claimed any one in claims 1 to 3, it is characterized in that, main control computer is also for operating by ethernet line Long-distance Control scope, adopt Mutli-thread Programming Technology, utilize hub and communication server to control respectively and vow that network parameters setting and antenna rotate, launch and collection.
6. the L-band bank base based on vector network analyzer sea clutter recording geometry as claimed any one in claims 1 to 3, it is characterized in that, described main control computer also comprises data analysis module, described data analysis module in conjunction with ocean environment parameter to described extra large clutter data analysis, comprise mean value model coupling and amplitude distribution matching.
7. the L-band bank base based on vector network analyzer sea clutter recording geometry as claimed any one in claims 1 to 3, it is characterized in that, described vector network analyzer adopts uninterrupted power source UPS power supply, described power amplifier adopts switching power supply power supply, and described power amplifier monitoring means and temperature monitoring unit adopt Switching Power Supply power supply.
8. the L-band bank base based on vector network analyzer sea clutter recording geometry as claimed any one in claims 1 to 3, it is characterized in that, also comprise supervisory computer, described supervisory computer is for monitor the rotary state of described dual-mode antenna by camera, and supervision sea state.
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