CN103245950A - Meteorological terminal matched and connected with multifunctional radar - Google Patents
Meteorological terminal matched and connected with multifunctional radar Download PDFInfo
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Abstract
The invention provides a meteorological terminal matched and connected with a multifunctional radar. The independent terminal is matched and connected with an active shore-based or a carrier-based radar to allow the independent terminal to have functions of a weather radar without affecting the working and performance of the radar. The terminal comprises a workstation or a server based on CPIP bus, an interface module, an intermediate frequency sampling digital receiver, a high speed digital signal processor, an integration of weather radar product generating, display and transmission software modules and other modules. The technical scheme of the terminal comprises the following steps: insulating and magnifying obtained back waves and data collected by the matched and connected radar through the interface module; sending one path of original signal to the intermediate frequency sampling digital receiver and the high speed digital signal processor for processing and conversion to obtain weather radar back wave fundamental wave data; generating a plurality of weather radar application products through the weather radar product generating module; displaying the products on a display of a control platform; and transferring the products to a command center if necessary, so as to be sent to other application departments. The meteorological terminal makes full use of the existing functions of the matched and connected radar without affecting the normal use, and has low refitting cost, convenience in installation, and high reliability, and is suitable for radars of X wave band, C wave band, and S wave band.
Description
Technical field
The present invention relates to the radar detection field, be configured on bank base or the carrier-borne advanced capabilities radar in particular to a kind of, make it to possess the meteorological terminal of weather radar function.
Background technology
Ocean, atmospheric environment guarantee be to information-based local war particular importance under the following high-technology condition, and the complicacy of ocean, atmospheric environment (as space-time changeableness of ocean geography environmental differences and naval air environment etc.) has significant impact to the performance of national security and equipment performance.
The meteorological terminal of multifunction radar connects on bank base or carrier-borne advanced capabilities radar as a separate unit, can be under the prerequisite that does not influence the radar routine operation, can from connect radar echo signal, extract detailed environmental data, comprise weather echo reflectivity, speed and velocity spectrum width etc.The height of its precision and sensitivity is compared also not a halfpenny the worse with U.S.'s Doppler radar of future generation (NEXRAD).The meteorological terminal of multifunction radar can be surveyed various atmospheric environment information such as precipitation, clear-air turbulence, wind fields.Generation contains the composite reflection rate figure of geographical location information, multiple weather radar application products such as wind profile figure,
The great advantage of bank base or carrier-borne advanced capabilities radar is that it can flexibly, accurately carry out beam scanning, and resolution system design is preferably wanted the contradiction of " dephasign pass " to requirement and the meteorological target echo signal double sampling of data transfer rate.When large-scale fleet goes to sea when fighting essential meteorological support and can not dispose special carrier-borne weather radar, adopt having the mode that carrier-borne advanced capabilities radar installs meteorological terminal additional now.Can satisfy the needs of fleet's meteorological support, also expand the usable range that connects radar.
Yet the routine observation means are difficult to obtain continuously large-scale meteorological element, and are bigger with the practical application request gap; Utilize the method for historical summary statistics, can not react current meteorological condition truly.In actual applications, all exist inevitable limitation.
Therefore, how to provide the meteorological terminal of multifunction radar to become problem demanding prompt solution.
Summary of the invention
The objective of the invention is to overcome the defective of above-mentioned technical matters, propose a kind of meteorological terminal of multifunction radar.Its characteristics are and connect radar equipment and synchronous working, take full advantage of and connect the radar prior function, do not influence and generate multiple weather radar application product under the prerequisite of the normal use that connects radar, make its ability that possesses weather radar, can satisfy the needs of fleet's meteorological support.The repacking cost is low, installs conveniently the reliability height additional.The present invention is applicable to the radar of X-band, C-band, S-band.
The invention provides a kind of meteorological terminal of multifunction radar, comprise: based on high-grade workstation (or server), interface module, IF Sampling Digital Receiver and the high speed digital signal processor of cpci bus, and with integrated (comprising software modules such as the generation of weather radar product, demonstration, transmission) of related software module.
Another object of the present invention is to provide a kind of method that obtains connecting radar surrounding environment parameter and multiple weather radar application product, comprise: scanned by predetermined antenna scanning pattern by the radar that connects, from the echoed signal that receives, tell and come, by interface module, deliver in the meteorological terminal of multifunction radar; Described interface module receives from signals such as the intermediate-freuqncy signal that connects radar, synchronizing pulse, clock signal, field angle data and mode of operation codings, through isolating, amplify and transferring in the IF Sampling Digital Receiver; IF Sampling Digital Receiver is sampled and conversion to the intermediate-freuqncy signal that receives, and obtains i/q signal, and it is delivered to high speed digital signal processor; High speed digital signal processor is handled i/q signal, and filtering ground clutter, point target clutter and other undesired signals obtain weather radar echo first-harmonic data after the processing such as the row distance of going forward side by side is corrected, warship speed and horizontal pitching compensation; Send described weather radar echo first-harmonic data to weather radar product generation module, generate multiple weather radar application product, and be presented on the display of control desk, also these products can be transferred to command centre in case of necessity, send to other application departments.
According to the present invention, a kind of meteorological terminal of multifunction radar is provided, be coupled on bank base or the shipborne radar, it is characterized in that comprising: cpci bus, connection is based on workstation or the server of cpci bus, interface module, IF Sampling Digital Receiver, high speed digital signal processor, and weather radar product generation module; Described interface module receives the original signal from described bank base or shipborne radar, transfers to IF Sampling Digital Receiver after isolating, amplifying; Described IF Sampling Digital Receiver is sampled to the signal that receives from described interface module, and carries out the A/D conversion, is converted to i/q signal through down-converted again, and it is delivered to high speed digital signal processor; Described high speed digital signal processor is handled the i/q signal that sampling obtains, filtering interference signals, and the row distance of going forward side by side is corrected, warship fast and horizontal pitching compensation deals, obtains weather radar echo first-harmonic data, then it is delivered to weather radar product generation module; The weather radar echo first-harmonic data that described weather radar product generation module is sent high speed digital signal processor here are utilized weather radar product generating algorithm, generate multiple weather radar application product.
According to a preferred embodiment of the invention, also comprise weather radar product display module, be used for the multiple weather radar application product that described weather radar product generation module generates is presented at the display of control desk.
According to a preferred embodiment of the invention, also comprise weather radar product transport module, be used for the multiple weather radar application product that described weather radar product generation module generates is transferred to command centre, to send to other application departments.
According to a preferred embodiment of the invention, wherein said original signal from described bank base or shipborne radar comprises: the echo signal of intermediate frequency that described bank base or shipborne radar collect, and synchronizing pulse and the clock signal of described bank base or shipborne radar itself.
According to a preferred embodiment of the invention, wherein said high speed digital signal processor is also handled the antenna beam angular data and the mode of operation coded signal that receive from interface module.
According to a preferred embodiment of the invention, wherein said echo signal of intermediate frequency is that the echoed signal that obtained by the scanning of invisible scanning strategy by the described bank base that connects or shipborne radar is again through the frequency conversion gained.
According to a preferred embodiment of the invention, the undesired signal of wherein said filtering comprise in extra large clutter, ground clutter, the point target clutter at least one of them.
According to another embodiment of the present invention, also provide a kind of use to be coupled to the method for work of the meteorological terminal of multifunction radar, may further comprise the steps: scanned by predetermined antenna scanning pattern by the radar that connects, from the echoed signal that receives, tell and come, by interface module, deliver in the meteorological terminal of multifunction radar; Described interface module receives from the echo signal of intermediate frequency that connects radar, synchronizing pulse, clock signal through isolating, amplify and transferring in the IF Sampling Digital Receiver; Field angle data and mode of operation coded signal are then directly delivered to high speed digital signal processor and are handled after isolating; IF Sampling Digital Receiver is sampled and conversion to the intermediate-freuqncy signal that receives, and obtains i/q signal, and it is delivered to high speed digital signal processor; High speed digital signal processor is handled i/q signal, filtering ground clutter, point target clutter and other undesired signals, and the row distance of going forward side by side is corrected, warship fast and horizontal pitching compensation deals, obtains weather radar echo first-harmonic data; Send described weather radar echo first-harmonic data to weather radar product generation module, generate multiple weather radar application product.
According to a preferred embodiment of the invention, further comprising the steps of: with the multiple weather radar application product of weather radar product generation module generation, the product display module of delivering to terminal is presented on the display of control desk, or multiple weather radar application product is transferred to command centre, to send to other application departments.
According to still another embodiment of the invention, a kind of meteorological terminal of multifunction radar is provided, be coupled on bank base or the shipborne radar, it is characterized in that comprising: cpci bus, connection is based on workstation or the server of cpci bus, interface module, IF Sampling Digital Receiver, high speed digital signal processor, and weather radar product generation module; Intermediate-freuqncy signal, synchronizing pulse, clock signal, antenna beam angular data and mode of operation coding that this terminal utilizes bank base or shipborne radar to collect, pass through interface module, these signals are passed through IF Sampling Digital Receiver, high speed digital signal processor, obtain weather radar echo first-harmonic data, generate multiple weather radar application product by weather radar product generation module then.
According to the present invention, be coupled to the meteorological terminal on bank base or the shipborne radar, utilize the echo information obtained of bank base or shipborne radar equipment to generate multiple weather radar application product in real time, continuously, the meteorological support that provides that goes to sea and fight for large-scale fleet.Major disaster weather such as typhoon, heavy rain, wind spout are very harmful to the navigation safety of fleet, need make weather forecast accurately in advance, in order in time take counter-measure to avoid risk; Extreme low-altitude wind shear, the yardstick of little downburst own is very little, and life cycle is very short, and common detection instrument is difficult in time find.It all can produce serious harm to the smooth emission that plays, falls safety and guided missile of ship-board aircraft, and it is very important beyond doubt to the safety of carrier-borne equipment to find and issue warning message in time, exactly.
The wind speed in the sky, region of war, wind direction directly have influence on the accuracy at target of precision guidance missile, therefore, instantly wind field information is provided in time, accurately, as the foundation of revising the missile flight track, can and brings into play its effect to the precise guidance of guided missile effective support is provided.
In addition, the atmospheric environment data that weather radar detects can also be as the suffered atmospheric environment of electronic equipments such as shipborne radar, communications facility being disturbed and influence is made assessment so that for taking effective indemnifying measure that foundation is provided.
Though will describe the present invention in conjunction with some exemplary enforcements and using method hereinafter, and it will be appreciated by those skilled in the art that and be not intended to the present invention is limited to these embodiment.Otherwise, be intended to cover all substitutes, correction and the equivalent that are included in the defined spirit of the present invention of appending claims and the scope.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being apparent to those skilled in the art to investigating hereinafter, perhaps can obtain instruction from the practice of the present invention.Target of the present invention and other advantages can be passed through following instructions, claims, and the specifically noted structure realizes and obtains in the accompanying drawing.
Description of drawings
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:
Fig. 1 forms synoptic diagram for the meteorological terminal that is coupled to multifunction radar of the present invention;
Fig. 2 is coupled to the meteorological terminal signaling flow graph of multifunction radar;
Fig. 3 is digital if receiver composition frame chart of the present invention;
The realization block diagram of Fig. 4 Digital Down Convert in FPGA;
Fig. 5 shows signal processor function block diagram of the present invention;
Fig. 6 signal processing system hardware block diagram;
Fig. 7 is terminal computer signal flow of the present invention;
Fig. 8 is interface module block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.It should be noted that embodiment according to atmospheric duct real-time detection of the present invention and diagnosis terminal as just example, but the invention is not restricted to this embodiment.
The purpose of this invention is to provide a kind of meteorological terminal that connects bank base or shipborne radar, finish the radar ambient atmosphere environment detection task that connects.It comprises: based on modules such as the workstation of cpci bus or server, interface module, IF Sampling Digital Receiver, high speed digital signal processor, the generation of weather radar product, demonstration, transmission.All hardware and software all are accommodated in naval's second generation standard indication control board.
After connecting the normal operation of radar unlatching, open this meteorology terminal.Utilize the terminal software module, control, open this terminal by display.After normally entering terminal software module working interface, represent working properly.Operating personnel can use the terminal software module to revise the parameter of this terminal and carry out necessary setting.
Characteristics of the present invention are and connect radar equipment and synchronous working, take full advantage of and connect the radar prior function, do not influence and generate multiple weather radar application product under the prerequisite of the normal use that connects radar, make its ability that possesses weather radar, can satisfy the needs of fleet's meteorological support.The repacking cost is low, installs conveniently the reliability height additional.The present invention is applicable to the radar of X-band, C-band, S-band.
The invention provides a kind of meteorological terminal of multifunction radar, comprise: based on high-grade workstation (or server), interface module, IF Sampling Digital Receiver and the high speed digital signal processor of cpci bus, and with integrated (comprising software modules such as the generation of weather radar product, demonstration, transmission) of related software module.The present invention also provides a kind of method that obtains connecting radar surrounding environment parameter and multiple weather radar application product, comprise: scanned by predetermined antenna scanning pattern by the radar that connects, from the echoed signal that receives, tell and come, by interface module, deliver in the meteorological terminal of multifunction radar; Described interface module receives from signals such as the intermediate-freuqncy signal that connects radar, synchronizing pulse, clock signal, field angle data and mode of operation codings, through isolating, amplify and transferring in the IF Sampling Digital Receiver; IF Sampling Digital Receiver is sampled and conversion to the intermediate-freuqncy signal that receives, and obtains i/q signal, and it is delivered to high speed digital signal processor; High speed digital signal processor is handled i/q signal, and filtering ground clutter, point target clutter and other undesired signals obtain weather radar echo first-harmonic data after the processing such as the row distance of going forward side by side is corrected, warship speed and horizontal pitching compensation; Send described weather radar echo first-harmonic data to weather radar product generation module, generate multiple weather radar application product, and be presented on the display of control desk, also these products can be transferred to command centre in case of necessity, send to other application departments.
According to the first embodiment of the present invention, the meteorological terminal of multifunction radar is coupled on bank base or the shipborne radar, comprise: cpci bus, connection is based on workstation or the server of cpci bus, interface module, IF Sampling Digital Receiver, high speed digital signal processor, and weather radar product generation module; Described interface module receives the original signal from described bank base or shipborne radar, transfers to IF Sampling Digital Receiver after isolating, amplifying; Described IF Sampling Digital Receiver is sampled to the signal that receives from described interface module, and carries out the A/D conversion, is converted to i/q signal through down-converted again, and it is delivered to high speed digital signal processor; Described high speed digital signal processor is handled the i/q signal that sampling obtains, filtering interference signals, and the row distance of going forward side by side is corrected, warship fast and horizontal pitching compensation deals, obtains weather radar echo first-harmonic data, then it is delivered to weather radar product generation module; The weather radar echo first-harmonic data that described weather radar product generation module is sent high speed digital signal processor here are utilized weather radar product generating algorithm, generate multiple weather radar application product.
In a preferred embodiment, the present invention also comprises weather radar product display module, is used for the multiple weather radar application product that described weather radar product generation module generates is presented at the display of control desk.In addition, can also comprise weather radar product transport module, be used for the multiple weather radar application product that described weather radar product generation module generates is transferred to command centre, to send to other application departments.
Wherein, comprise the echo signal of intermediate frequency that described bank base or shipborne radar collect from the original signal of described bank base or shipborne radar, and synchronizing pulse and the clock signal of described bank base or shipborne radar itself.High speed digital signal processor is also handled the antenna beam angular data and the mode of operation coded signal that receive from interface module.Echo signal of intermediate frequency is that the echoed signal that obtained by the scanning of invisible scanning strategy by the described bank base that connects or shipborne radar is again through the frequency conversion gained.The undesired signal of filtering comprise in extra large clutter, ground clutter, the point target clutter at least one of them.
According to another embodiment of the present invention, also provide a kind of use to be coupled to the method for work of the meteorological terminal of multifunction radar, may further comprise the steps: scanned by predetermined antenna scanning pattern by the radar that connects, from the echoed signal that receives, tell and come, by interface module, deliver in the meteorological terminal of multifunction radar; Described interface module receives from the echo signal of intermediate frequency that connects radar, synchronizing pulse, clock signal through isolating, amplify and transferring in the IF Sampling Digital Receiver; Field angle data and mode of operation coded signal are then directly delivered to high speed digital signal processor and are handled after isolating; IF Sampling Digital Receiver is sampled and conversion to the intermediate-freuqncy signal that receives, and obtains i/q signal, and it is delivered to high speed digital signal processor; High speed digital signal processor is handled i/q signal, filtering ground clutter, point target clutter and other undesired signals, and the row distance of going forward side by side is corrected, warship fast and horizontal pitching compensation deals, obtains weather radar echo first-harmonic data; Send described weather radar echo first-harmonic data to weather radar product generation module, generate multiple weather radar application product.
In a preferred embodiment, further comprising the steps of: with the multiple weather radar application product of weather radar product generation module generation, the product display module of delivering to terminal is presented on the display of control desk, or multiple weather radar application product is transferred to command centre, to send to other application departments.
According to still another embodiment of the invention, a kind of meteorological terminal of multifunction radar is provided, be coupled on bank base or the shipborne radar, it is characterized in that comprising: cpci bus, connection is based on workstation or the server of cpci bus, interface module, IF Sampling Digital Receiver, high speed digital signal processor, and weather radar product generation module; Intermediate-freuqncy signal, synchronizing pulse, clock signal, antenna beam angular data and mode of operation coding that this terminal utilizes bank base or shipborne radar to collect, pass through interface module, these signals are passed through IF Sampling Digital Receiver, high speed digital signal processor, obtain weather radar echo first-harmonic data, generate multiple weather radar application product by weather radar product generation module then.
According to the present invention, be coupled to the meteorological terminal on bank base or the shipborne radar, utilize the echo information obtained of bank base or shipborne radar equipment to generate multiple weather radar application product in real time, continuously, the meteorological support that provides that goes to sea and fight for large-scale fleet.Major disaster weather such as typhoon, heavy rain, wind spout are very harmful to the navigation safety of fleet, need make weather forecast accurately in advance, in order in time take counter-measure to avoid risk; Extreme low-altitude wind shear, the yardstick of little downburst own is very little, and life cycle is very short, and common detection instrument is difficult in time find.It all can produce serious harm to the smooth emission that plays, falls safety and guided missile of ship-board aircraft, and it is very important beyond doubt to the safety of carrier-borne equipment to find and issue warning message in time, exactly.
The wind speed in the sky, region of war, wind direction directly have influence on the accuracy at target of precision guidance missile, therefore, instantly wind field information is provided in time, accurately, as the foundation of revising the missile flight track, can and brings into play its effect to the precise guidance of guided missile effective support is provided.
In addition, the atmospheric environment data that weather radar detects can also be as the suffered atmospheric environment of electronic equipments such as shipborne radar, communications facility being disturbed and influence is made assessment so that for taking effective indemnifying measure that foundation is provided.
Next, describe the specific embodiment of the present invention with reference to the accompanying drawings in detail.
Fig. 1 is that the meteorological terminal that is coupled to multifunction radar of the present invention is formed synoptic diagram.This meteorology terminal comprises interface module, digital if receiver, high speed digital signal processor, main frame and peripheral hardware.
Scanned by predetermined antenna scanning pattern by the radar that connects, from the echoed signal that scanning obtains, tell and come, by interface module, deliver in the meteorological terminal of multifunction radar; Described interface module receives from the echo signal of intermediate frequency that connects radar, synchronizing pulse, clock signal through isolating, amplify and transferring in the IF Sampling Digital Receiver; Field angle data and mode of operation coded signal are then directly delivered to high speed digital signal processor and are handled after isolating; IF Sampling Digital Receiver is sampled and conversion to the intermediate-freuqncy signal that receives, and obtains i/q signal, and it is delivered to high speed digital signal processor; High speed digital signal processor is handled i/q signal, filtering ground clutter, point target clutter and other undesired signals, and the row distance of going forward side by side is corrected, warship fast and horizontal pitching compensation deals, obtains weather radar echo base data; Send described weather radar echo base data to weather radar product generation module, generate multiple weather radar application product.These application products, the product display module that is sent to terminal is presented on the display of control desk, also is transferred to command centre, to send to other application departments.
Cpci bus is unified into an organic whole as the public passage of each intermodular data and order exchange with whole terminal.
Fig. 2 is the meteorological terminal signaling process flow diagram that is coupled to multifunction radar of the present invention.
Because from connecting echo signal of intermediate frequency that radar comes out along separate routes with ref clock, synchronization pulse are all very faint mutually, so deliver to digital if receiver again after need isolating, amplify through interface module.Simultaneously, interface module is also directly delivered to high speed digital signal processor with angular data and the mode of radar code of antenna after isolating.The analog intermediate frequency echoed signal is for conversion into digital medium-frequency signal through A/D in digital if receiver, become i/q signal through coherent detection again.Together with the angular data of the antenna of after interface module is isolated, sending here and the filtering in high speed digital signal processor of mode of radar code, processing.Reception, the distance of mainly finishing the i/q signal of digital intermediate frequency corrected, the fast and horizontal pitching compensation of warship; Filterings such as background return, some clutter; Weather radar product generation module generates multiple weather radar application product, and is presented on the display of control desk, also these products can be transferred to command centre in case of necessity, sends to other application departments.
Digital intermediate frequency shown in Figure 3 is based on the high-performance processor of High Speed High Precision ADC and extensive field programmable logic device (FPGA), and it is made of ADC, clock inverter PLL, MCU and FPGA.Clock inverter will carry out phase-locked frequency demultiplication by interface module reference clock signal that pass on, that connect radar, the required sampling clock of generation system is sent into ADC, the latter samples to the echo signal of intermediate frequency real-time high-precision, be converted to 14 bit digital intermediate-freuqncy signals, deliver to the digital down converter that is constituted by FPGA again.
Fig. 4 shows the block diagram that Digital Down Convert realizes.In FPGA, at first carry out Digital Down Convert with the sine that is mutually 90 degree and cosine numeral coherent reference signal, obtain the frequency variation signal of two branch roads of I/Q, through 3 grades of filtering, 2 grades of processing such as extraction, carry out obtaining 24 IQ data after saturation compensation is handled, also string is changed again and send into signal processor then.
Fig. 5 shows the functional block diagram of signal processor.Serial i/Q the data of digital intermediate frequency output obtain parallel signed integer, 24 of data bit widths after string and conversion.For the extension storage degree of depth, to satisfy the requirement to investigative range, need these data are carried out the floating-point conversion, obtain the integer of 16 floating point representations.Behind the asynchronous receiver module of aerial angle data process of antenna servo by standard serial port output, obtain parallel antenna bearingt and luffing angle frame data, under the control of synchronous trigger pulse, realize the packing of I/Q data and antenna data, and deposit among the RAM of chip internal; The PCI time schedule controller is used for connecting pci bus and local bus, starts in the full back of frame data storage and interrupts sequential, and the notice terminal computer is initiated the DMA request of data; When carrying out the DMA data transmission, the RAM of chip internal is in the ping-pong operation state, and real-time data memory is in another sheet storage area, to guarantee continuity and the correctness of data.
Signal processor is mainly used in obtaining in real time of I/Q data, real-time collection and the packing of aerial angle and state, and system is regularly, the CPCI interface data is mutual etc.
In a preferred embodiment, signal processor can adopt the EP3C55 of altera corp to finish buffer memory and the retransmission function of I/Q data, this chip has 55865 logical blocks, the 2340Kbits storage unit, 244 multipliers, the signal work for the treatment of of competent fully this system of 4 digital phase-locked loops, the hardware resource of this chip.
And tasks such as filtering ground clutter, undesired signal and the generation of weather radar product, demonstration, transmission are to be finished by software module in principal computer, and software module signal processor signal flow as shown in Figure 7.
In Fig. 7, terminal computer receives the I/Q Frame of floating-pointization by cpci bus, and be converted to the floating data of computer standard, at first carry out coherent accumulation to improve signal to noise ratio (S/N ratio), carry out noise gate again and differentiate filtering noise, keep effective echoed signal, adopt the oval filter method of time domain to remove land clutter, point target clutter etc. according to the atural object clutter map then, wherein one the tunnel generate the echo reflection rate, another road generates echo average velocity and spectrum width by FFT.This three number is stated to be the echo base data.They are transported to weather radar product generation module, generate multiple weather radar secondary application product, and are presented on the display of control desk, also these products can be transferred to command centre in case of necessity, send to other application departments.
Fig. 8 shows the block diagram of interface module.
Because meteorological terminal is based on the active service radar, finish to connect radar ambient atmosphere environment detection task on the basis that does not influence active service radar operate as normal, so implemented quarantine measures in this terminal.
This terminal is to obtain medium-frequency IF signal, coherent reference signal, synchronous triggering signal along separate routes from the active service radar, considers the insertion loss of power splitter, so adopted isolated amplifier to satisfy this terminal and the active service radar is worked simultaneously in this module.
Below, several application products that this meteorology terminal is generated are brief description in addition: radar performance parameter, scanning strategy and combat duty are different according to connecting, and application product is also different, and the most basic product should have:
1. fundamental reflection rate (R)
1. the description of product: fundamental reflection rate (R:Reflectivity) has been described the echo strength data of 360 ° of complete azimuth scans, can obtain each elevation angle in the volume scan.Product shows that with polar form the range ring distance be projector distance, and product has 16 reflectivity factor level interval (unit: dBz, for example, 5 to 10dBz, 10 arrive 15dBz).Other scope of data level is from-5dBz to+75dBz.
2. product purpose: the fundamental reflection rate factor is used to estimate the hail potentiality, determines the storm structure and determines the border and the precipitation nuclear location also can be used for the detection of cold front, main line, storm outflow border, slight precipitation (as snow and drizzle) etc. simultaneously.When product output shows, the weather echo of influence flight and navigation safety is made sign and early warning.
3. limitation: owing to be subjected to the influence of vertical beam width, its echo height error is bigger, therefore can only make judgement (other products is identical in this) to the orientation of echo.
2. base speed (V)
1. the description of product: the radial velocity data of the whole 360 ° of azimuth scans of base speed (V:mean radial velocity) expression can obtain at each elevation angle of sampling.Product shows that with polar form 18 data level interval (unit is m/s) are arranged.Product is described the radial component (represent, be that positive radar is represented with warm colour away from speed with cool colour for negative towards the radar speed value) of wind with change color.
2. product purpose: product with the change color on the terminal interface (adjustable parameter) describe wind radial component (towards or away from radar).The forecaster can estimate wind speed and direction, determine (surface of density discontinuity) position, border and determine significant shear zone (being convergence, divergence, middle cyclone and spout vortex feature) with this product; When product output shows, the weather echo that influences flight safety is made sign and early warning.
3. the base speed product has 2 limitation.One average radial velocity that is perpendicular to the wind of radar beam is represented as O; The 2nd, distance is folding moves back fuzzy with incorrect speed.Distance is folding occur in system can not distinguish return energy derive from nearest emission pulse or by farther weather phenomenon return with prepulse (claiming " second journey ", echoes such as " the 3rd journeys ").If make two echoes overlapping owing to multipass returns, speed data just is specified in last than the distance of strong echo.
3. basic spectrum width (W)
1. the description of product: the spectrum width data of 360 ° of azimuth scans of basic spectrum width (W:spectrum width) expression, each sampling elevation angle can obtain.Product shows that with polar form 10 data ranks (unit is m/s) are arranged.
2. product purpose: it can provide because the observation that the average radial velocity that wind shear, turbulent flow and speed sample quality cause changes also can be used to determine position, border (surface of density discontinuity), estimates the turbulent flow size and checks whether radial velocity is reliable.In addition, because bigger radial velocity shear is relevant with middle cyclone and spout usually, so the spectrum width product also can be used for determining the position of middle cyclone and spout.Note returning and to cause irregular spectrum width data near the weak signal of noise threshold; When product output shows, the weather echo that influences flight safety is made sign and early warning.
4. raininess (RZ)
1. the description of product: weather radar can disclose the spatial and temporal distributions of precipitation zone radar reflection factor Z or usable reflection factor Z e, and according to theory and actual observation, Z (Ze) and precipitation intensity exist certain relation, so available radar intensity data is estimated the raininess distribution.
Raininess (RZ:Rain Intensity) is defined as the quality of falling the water on the unit area (being generally 1km*1km, 2km*2km, three kinds of 4km*4km) in the unit interval.
What the raininess product showed is the raininess size, and the raininess in the search coverage distributes with 16 data grades of 16 kinds of color showings.The unit of raininess is mm/h.
2. product purpose: weather radar can disclose the spatial and temporal distributions of precipitation zone radar reflection factor Z or usable reflection factor Z e, and according to theory and actual observation, Z (Ze) and precipitation intensity exist certain relation, so available radar intensity data is estimated the raininess distribution.
5. speed side is for showing (VAD)
1. the description of product: Velocity Azimuth shows that (VAD:Velocity Azimuth Display) refers under certain basic assumption condition, from speed with the technology that is finally inversed by average wind vector and divergence and deformation azimuthal distribution.Use this method, single portion radar namely can obtain information such as mean wind direction wind speed and average divergence in the precipitation area.
2. product purpose: if there are enough data points to exist, then calculate the sine wave that adapts with data, again with the wind speed and direction on this sinusoidal wave calculating certain height.In case sinusoidal wave coincide with data, with regard to counting statistics sum of errors symmetry (radial velocity poor that becomes a mandarin and go out stream), if surpassed statistical error or symmetric threshold value, algorithm is no longer calculation of wind speed and wind direction just.Product is mainly used in checking the wind data of omitting in suspicion or the VAD wind profile.Wind field distortion (as cutting edge of a knife or a sword, groove) on analyzed area can the impact analysis result.
6. wind profile (VWP)
1. the description of product: the mean wind direction wind speed in wind profile product (VWP:Wind Profile) the expression certain level zone on the respective heights over time.It obtains the mean wind direction wind speed on the basis of VAD product, uses the radar scanning data of time in succession, can obtain the profile graphics that mean wind direction and mean wind speed time change.
2. product purpose: Velocity Azimuth show vertically-supplying air profile (VWP:velocity azimuth displaywind profile) time-height map shows average level wind (calculated and get at every layer by vad algorithm).Can show 30 conventional barbs from ground to 21km, this product also shows 10 nearer wind/height profiles except the wind/height profile that shows the nearest time.This product all is useful to the development of determining low latitude and high-level jet stream, heating power advection type, vertical wind shear, sharp side thickness and isentropic surface lifting situation.Not excessively lack scatterer or when statistical error and symmetry threshold value were exceeded the processing stage of VAD, the use of this product was restricted.
7. strong echo tracking and prediction (SETI)
1. the description of product: strong echo tracking information (STI) product sweep according to a plurality of bodies in continuous time the strong echo that identifies contour feature, realize strong echo tracking by contour feature, do nonlinear extrapolation again and forecast its position.
2. product purpose: SETI is conducive to analyze the storm body information that monitoring is separated from each other easy identification, and movement and the development of monitoring storm are good references, realizes the storm tracking by storm body coupling, does nonlinear extrapolation again and forecasts its position.
8. turbulent flow (TUB)
1. the description of product: turbulent flow (TUB:Turbulence) product is to use the speed spectrum width data that radar Doppler obtains, and according to the relational expression of it and turbulence intensity, estimates that atmosphere mesoscale is less than the product of the flow perturbation intensity distributions of radar sampling volume.
2. product purpose: product is to use the reflectance data that radar Doppler obtains to estimate to reflect the mean value of the rate of penetrating.It can judge the movement tendency of storm in conjunction with fundamental reflection rate data, and it can be used for the monitoring in air craft battery zone and forecast are also helped to estimate the development of precipitation cloud body.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the meteorological terminal of a multifunction radar is coupled on bank base or the shipborne radar, it is characterized in that comprising:
Cpci bus connects workstation or server based on cpci bus, interface module, IF Sampling Digital Receiver, high speed digital signal processor, and weather radar product generation module;
Described interface module receives the original signal from described bank base or shipborne radar, transfers to IF Sampling Digital Receiver after isolating, amplifying;
Described IF Sampling Digital Receiver is sampled to the signal that receives from described interface module, and carries out the A/D conversion, is converted to i/q signal through down-converted again, and it is delivered to high speed digital signal processor;
Described high speed digital signal processor is handled the i/q signal that sampling obtains, filtering interference signals, and the row distance of going forward side by side is corrected, warship fast and horizontal pitching compensation deals, obtains weather radar echo first-harmonic data, then it is delivered to weather radar product generation module;
The weather radar echo first-harmonic data that described weather radar product generation module is sent high speed digital signal processor here are utilized weather radar product generating algorithm, generate multiple weather radar application product.
2. meteorological terminal according to claim 1 also comprises weather radar product display module, is used for the multiple weather radar application product that described weather radar product generation module generates is presented at the display of control desk.
3. meteorological terminal according to claim 1 also comprises weather radar product transport module, is used for the multiple weather radar application product that described weather radar product generation module generates is transferred to command centre, to send to other application departments.
4. meteorological terminal according to claim 1, wherein said original signal from described bank base or shipborne radar comprises: the echo signal of intermediate frequency that described bank base or shipborne radar collect, and synchronizing pulse and the clock signal of described bank base or shipborne radar itself.
5. meteorological terminal according to claim 1, wherein said high speed digital signal processor is also handled the antenna beam angular data and the mode of operation coded signal that receive from interface module.
6. meteorological terminal according to claim 2, wherein said echo signal of intermediate frequency are that the echoed signal that obtained by the scanning of invisible scanning strategy by the described bank base that connects or shipborne radar is again through the frequency conversion gained.
7. meteorological terminal according to claim 1, the undesired signal of wherein said filtering comprise in extra large clutter, ground clutter, the point target clutter at least one of them.
8. a use is coupled to the method for work of the meteorological terminal of multifunction radar according to claim 1, may further comprise the steps:
Scanned by predetermined antenna scanning pattern by the radar that connects, from the echoed signal that receives, tell and come, by interface module, deliver in the meteorological terminal of multifunction radar;
Described interface module receives from the echo signal of intermediate frequency that connects radar, synchronizing pulse, clock signal through isolating, amplify and transferring in the IF Sampling Digital Receiver; Field angle data and mode of operation coded signal are then directly delivered to high speed digital signal processor and are handled after isolating;
IF Sampling Digital Receiver is sampled and conversion to the intermediate-freuqncy signal that receives, and obtains i/q signal, and it is delivered to high speed digital signal processor;
High speed digital signal processor is handled i/q signal, filtering ground clutter, point target clutter and other undesired signals, and the row distance of going forward side by side is corrected, warship fast and horizontal pitching compensation deals, obtains weather radar echo first-harmonic data;
Send described weather radar echo first-harmonic data to weather radar product generation module, generate multiple weather radar application product.
9. detection method according to Claim 8, further comprising the steps of:
With the multiple weather radar application product that weather radar product generation module generates, the product display module of delivering to terminal is presented on the display of control desk, or multiple weather radar application product is transferred to command centre, to send to other application departments.
10. the meteorological terminal of a multifunction radar is coupled on bank base or the shipborne radar, it is characterized in that comprising:
Cpci bus connects workstation or server based on cpci bus, interface module, IF Sampling Digital Receiver, high speed digital signal processor, and weather radar product generation module;
Intermediate-freuqncy signal, synchronizing pulse, clock signal, antenna beam angular data and mode of operation coding that this terminal utilizes bank base or shipborne radar to collect, pass through interface module, these signals are passed through IF Sampling Digital Receiver, high speed digital signal processor, obtain weather radar echo first-harmonic data, generate multiple weather radar application product by weather radar product generation module then.
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Application publication date: 20130814 |