CN105242273A - X-band dual-polarization Doppler weather radar system - Google Patents

Abstract

The invention provides an X-band dual-polarization Doppler weather radar system which comprises two parts which are an outer machine and an inner machine. The outer machine part comprises an antenna server subsystem, a transmission subsystem, a receiving subsystem, a monitoring calibration subsystem, and a power distribution system. The inner machine part comprises a signal processor and a user subsystem. According to the system, an original signal chain design is employed, the amount of equipment is reduced, and the reliability of the system is improved. A mode of multi-channel signal processing is employed, the simultaneous measurement of all parameters of a dual-wire Doppler weather radar is realized, and the timeliness of detection data is improved. The GPU-based signal processing technology is employed, and the dual-wire signal processing ability is improved. The unique dual-channel full path transceiver calibration technology is employed, the dual-channel transceiver system error of the radar system is reduced, and the improvement of detection data quality is effectively ensured.

Description

A kind of X-band polarization Doppler Weather Radar system

Technical field

The invention belongs to the technical field of weather radar.Specifically, the present invention relates to a kind of X-band polarization Doppler Weather Radar system.

Background technology

1, X-band Solid Double Linear-polarization Doppler Weather Radar is in a direction of weather radar future development.At present, the equal Shortcomings part of real-time that this radar system detects at signal link mechanism, binary channels demarcation and parameter, thus obtained detection information is difficult to obtain fully effective utilization.Its shortcoming is as follows:

(1), signal system link mechanism is complicated;

(2), receive, launch binary channels and polarization feeder network calibration imperfection;

(3), dual-polarization parameter (LDR) detects poor in timeliness.

2, the special DSP signal processing technology adopted in existing signal transacting, safeguards to system upgrade and makes troubles.

3, in the structural design of prior art, antenna reflective face is outside exposed, does not have protective cover, vulnerable to pollution, and head-on wind resistance is lower.

4, live video image acquisition function is not had.

Summary of the invention

The invention provides a kind of X-band polarization Doppler Weather Radar system, its objective is simplified apparatus, improve system signal processing power and detection performance, enhancing system looks ageing and improve the reliability of system.

To achieve these goals, the technical scheme that the present invention takes is:

Polarization Doppler Weather Radar system comprises outer machine and interior machine two parts, and described outer machine part comprises antenna servo subsystem, launches subsystem, HF receiving subsystem, monitoring calibration subsystem, distribution system; Described interior machine part comprises signal processor, user's subsystem.

Described radar system signal link adopts two CF signal design.

Described signal processor adopts the processing unit based on GPU signal processing technology.

Described monitoring calibration subsystem is the subsystem of binary channels complete trails transmitting-receiving calibration technology.

Described antenna servo subsystem adopts rotary parabolic surface antenna, and is provided with parabola protective cover.

The present invention adopts technique scheme, has following effect:

1, adopt the signal link mechanism of original creation, simplify feed and the switching network of Dual-Polarized Doppler Weather Radar system complex of the prior art, reduce equipment amount, improve the reliability of system.

2, adopt the mode of multi-channel signal processing, the Fast synchronization realizing all parameters of two-wire Doppler radar is measured, and improves the ageing of detection data.

3, first based on GPU signal processing technology, drastically increase the signal handling capacity of Dual-linear polarization radar, meet the real-time measurement of all parameters of Dual-linear polarization radar and the display of many picture synchronization better, and provide possibility for the 3D of meteorological target restores display.

4, unique binary channels complete trails transmitting-receiving calibration technology, reducing to pole dog the binary channels receive-transmit system error of radar system, providing effective guarantee for improving detection data quality.

5, in configuration aspects, adopt the design of parabola protective cover, not only increase the wind loading rating of radar, also reduce the pollution of reflecting surface, protective effect is served to feeder network.

6, first in weather radar, adopt video image acquisition device, on-the-spot weather scene and scene characteristic can be enrolled in real time, for weather forecast and research provide the historical basis with real scene reference.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention

Fig. 2 is the side schematic view of structure shown in Fig. 1;

Fig. 3 is remote multi-subscriber terminal of the present invention composition schematic diagram;

Fig. 4 system chart of the present invention;

Fig. 5 is typical two two receipts radar system block diagrams;

Fig. 6 is the schematic diagram of the more multiple transistor in GPU for data processing.

Embodiment

One, summarize:

Structure of the present invention as shown in Figure 1 and Figure 2, a kind of X-band polarization Doppler Weather Radar system, by outer machine.The present invention is in multi-carrier frequency signals link mechanism, four-way signal processing technology, based on GPU signal processing technology, binary channels complete trails transmitting-receiving calibration technology, obtain outstanding progressive in the multinomial technology such as live video image acquisition technique.

In order to solve prior art Problems existing and overcome its defect, the goal of the invention of the processing power of the ageing of detection data and raising signal that realizes simplified apparatus, improves the reliability of system, improves, the technical scheme that the present invention takes is:

As shown in Figure 3, in this polarization Doppler Weather Radar system, its outer machine part is made up of antenna servo subsystem, transmitting subsystem, HF receiving subsystem, monitoring calibration subsystem, distribution system etc.; In it, machine part is made up of signal processor, user's subsystem etc.

Fig. 5 is typical two two receipts dual polarization radar block diagrams of system, in this system, horizontal and vertical polarization is same signal, measure by using high power combination Switching Two polarization measurement and depolarization, detailed process is: under terminal control, when realizing dual polarization detection, controlled to make high power combination switch possess power splitter function by actuating motor, realize the detections such as Zdr, Kdp.When detecting LDR, being controlled to make high power combination switch possess single-way switch function by actuating motor, i.e. an emission level polarized signal, receiving horizontal and vertical polar echo, thus obtain LDR.

Above-mentioned visible, because system contains the existence of topworks's motor, be all restricted in volume and reliability etc.

And the technical scheme that the present invention takes is:

1, Dual-linear polarization radar signal link mechanism is adopted:

This radar adopts dual signal link to establish obituary, namely waveform stimulus is two signal sources, transmitter is two (H/V) separate passages, such system can pass through the echoed signal of the direct processing horizontal passage of frequency selection method and vertical channel, two channel errors adopt the calibration mode of this programme to calibrate, and system composition structure as shown in Figure 4.

The present invention adopts the signal link mechanism of original creation, simplifies feed and the switching network of Dual-Polarized Doppler Weather Radar system complex of the prior art, reduces equipment amount, improve the reliability of system; Adopt multi-channel signal processing, measure while achieving all parameters of two-wire Doppler radar, improve the ageing of detection data.First based on GPU signal processing technology, drastically increase the signal handling capacity of Dual-linear polarization radar, meet the real-time measurement of all parameters of Dual-linear polarization radar well, and for meteorological target 3D and restore display provide possibility.

2, multi-channel signal processing technology is adopted:

From block diagram 4 of the present invention, in receiver H, except having own channels echo, also have the depolarization echo of V passage, same in receiver V, except having own channels echo, also have the depolarization echo of H passage.Because the present invention adopts double frequency system, therefore adopt many (four) passage digital if receiver can extracting directly four tunnel echoed signal, thus realize all parameter real-time detections of the dual-polarizations such as Zdr, Kdp, LDR, existing dual polarization radar then can not.

Two, described signal processor adopts based on GPU signal processing technology.

Because present system adopts open signal processing technology, namely pre-service is carried out by digital if receiver, by optical fiber, four-way data-signal is sent to interior machine computer terminal, is directly carried out the process of dual-polarization signal by terminal computer, therefore terminal computer is had higher requirement.Be multi-core CPU and multinuclear GPU based on current main flow processor chips, Dual-Polarized Doppler Weather Radar is in the urgent need to 3D figure that is real-time, high definition simultaneously, programmable GPU has become the first-selection of processor of a kind of highly-parallel, multithreading, multinuclear, it has outstanding rated output and high bandwidth of memory, reason be just GPU aim at computation-intensive, highly-parallel calculating and design, thus, the design of GPU can make more multiple transistor for data processing, but not data buffer storage and current control.

As shown in Figure 6:

More particularly, GPU is exclusively used in the problem program of executed in parallel on many data elements one by one solving and can be expressed as data parallel, has high bulk density (ratio of mathematical operation and memory operations).Because all data elements all perform identical program, less demanding therefore to accurate current control; Owing to running on many data elements, and there is higher bulk density, thus by calculating concealing memory access delay, and larger data buffer storage need not be used.

Parallel data processing can by data element mappings to parallel processing threads.The application program of many process large data collection all can carry out speed-up computation by usage data parallel programming model.In 3D plays up, a large amount of pixels and vertex set will be mapped to parallel thread.Similarly, image and media nursing application program (as the post-processed of rendering image, Video coding and decoding, image scaling, stereoscopic vision and pattern-recognition etc.) can by image block and pixel-map to parallel processing threads.In fact, the many algorithms outside image rendering and process field be also all by parallel data processing accelerate one by one from normal signal process or physical simulation until mathematics finance or mathematic biology.

In program design, CUDA programming model is applicable to the parallel function of open GPU very much.The NVIDIAGPU of latest generation, based on Tesla framework (can check the GPU list of all support CUDA in appendix), supports CUDA programming model, can significantly accelerate CUDA application program.

Three, described monitoring calibration subsystem is the subsystem of binary channels complete trails transmitting-receiving calibration technology.

The present invention adopts the calibration mode of original creation, namely by antenna feed as calibration point, make to transmit path and receiving cable complete detection and calibration, and existing radar does not carry out calibration to feed and transmission channel.

Unique binary channels complete trails transmitting-receiving calibration technology, greatly reducing the binary channels receive-transmit system error of radar system, providing effective guarantee for improving detection data quality.

Four, described monitoring calibration subsystem is used for:

1) APCOI subsystem monitor data, is received;

2) TX02 subsystem monitor data, is received;

3) RX03 subsystem monitor data, is received;

4) SPTE04 subsystem monitor data, is shown;

5) the various clock signals needed for calibration, are produced;

6), amplitude, phase place calibration and first phase calibration are carried out to transmitting binary channels;

7), reception binary channels is carried out to amplitude, phase place calibration and carried out Noise Calibration;

8), environmental requirement :-40 DEG C ~+55 DEG C.

Five, described antenna servo subsystem adopts rotary parabolic surface antenna, and is provided with paraboloid of revolution protective cover.

Adopt the design of parabola protective cover, not only increase the wind loading rating of radar, also reduce the pollution of reflecting surface, protective effect is served to feeder network.

See Fig. 1 and Fig. 2.

Six, described antenna servo divides the parameter being to be:

Antenna form: the paraboloid of revolution;

1), frequency: X-band;

2), polarization mode: level, vertical dual linear polarization;

3), diameter: 1.8m;

4), gain: >=40dB;

5), minor level :≤-27dB;

6), electric axis sensing wave beam major axes orientation is poor :≤0.1.；

7), antenna scanning mode: PPI, RHI, body are swept, fan sweeping, fixed point;

8), antenna scanning scope: orientation 0 ~ 360.; Pitching 0 ~ 90.；

9), antenna scanning speed: orientation 1 ~ 4rpm; Pitching 1 ~ 2rpm;

10), wind loading rating (fitful wind): moderate gale can work, and strong gale is not suffered a loss;

The parameter of seven, described transmitting subsystem is:

1), frequency of operation: X-band;

2), output power: >=I50W; (independent dual transmitter)

3), maximum pulse width: lOOuS, dutycycle >20%;

4), repetition frequency: 400Hz ~ 4kHz;

5), amplitude coincidence: ± ldB;

6), phase equalization: ± 10.。

7), stream time: be not less than 24h;

8), environmental requirement :-40 DEG C ~+55 DEG C.

The parameter of eight, described HF receiving subsystem is:

1), frequency of operation: X-band (binary channels);

2), receiver gain: 40dB ± 3dB;

3), noise figure :≤3.OdB;

4), IF-FRE: IFI, IF2;

5), intermediate-frequency bandwidth 3dB:IFI ± 2.5MHz, IF2 ± 2.5MHz;

6), intermediate frequency exports amplitude peak: lOdBm;

7), amplitude coincidence: ± 0.5dB;

8), phase equalization: ± 10.；

9), environmental requirement :-40 DEG C ~+55 DEG C.

Nine, described Weather radar system is provided with video image acquisition device.

First in weather radar, adopt video image acquisition device, on-the-spot weather scene and scene spy can be enrolled in real time, for weather forecast and research provide the historical basis with real scene reference, as shown in Figure 1.

Ten, described Weather radar system is provided with combines subsystem frequently, and described frequency is combined subsystem parameter and is:

1), local oscillation signal: X-band;

2), binary channels up-conversion: X-band;

3), waveform signal: IFI, IF2;

4), calibration signal is exported: intensity, speed;

5), reference signal: IOOMHz

I. phase noise: <-160dBc/Hz, lkHz;

Ll. frequency stability: <3 × 10-ll/ms.

6), environmental requirement :-40 DEG C ~+55 DEG C.

Software and the Meteorological Products look of 11, described signal processor are drawn together:

1), main processing capacity: PPP, FFT, self-adapting clutter suppress, eliminate based on the second trip echo of random phase encoding and recover.

2), fundamental physical quantity:

Z intensity, V speed, W spectrum width, ZDR reflectance difference rate, KDP differential phase shift propagation constant, LDR depolarization ratio and the I/Q of 16, the Doppler power spectra of specific range unit;

3), master data product:

Planimetric position display PPI, distance highly show RHI, contour plane position display CAPPI, composite reflectivity factor CR.

4), physical quantity product:

At the bottom of echo high planimetric position display ETPPI, echo, height planimetric position display EBPPI, one hour accumulative rainfall amount OHP, three hours accumulative rainfall amount THP, the total accumulative rainfall amount STP of storm, vertical integration aqueous water VIL, orientation vorticity display ARD, radial divergences show RVD, synthesis shear CS, layered combination turbulent flow CTA.

5), Wind Products:

Velocity Azimuth display VAD, VAD Wind outline VWP.

6), strong weather identification product:

Storm structure SS, hail index HI, storm tracked information STI, mesoscale cyclone M, spout vortex feature TVS, downburst DB.

7), graphics process:

Multi-layer graphical shows: show multiple CAPPI (contour plane position display) simultaneously;

Township's picture display: can show more than 4 width and above picture on the screen at the same;

Animation: animation speed is variable, can manual animation, and animation width number is determined by product specification;

Pattern visual evoked potentials, roaming;

Graphics memory and Background load;

Histogram shows;

Isoline shows;

Roaming guides: enrolled by vernier and show the orientation of vernier point, distance, highly, the information such as echo strength, speed.

8), radar control and management software: the monitoring of radar control software, radar complete machine, fault alarm software, Radar Calibration calibration software, radar data management software, network communication software.

The parameter of 12, described distribution system is:

1), input voltage: 220Vac, frequency: 50Hz;

2), power :≤2kVA.

13, multi-user's subsystem:

Native system adopts open type data tupe, and user obtains product source book by authorized or sharing mode, and the algorithm development applying oneself goes out more required Meteorological Products.

Claims (2)

1. an X-band polarization Doppler Weather Radar system, comprises outer machine and interior machine two parts, it is characterized in that: described outer machine part comprises antenna servo subsystem, launches subsystem, HF receiving subsystem, monitoring calibration subsystem, distribution system; Described interior machine part comprises signal processor, user's subsystem;

Described radar system adopts link mechanism, and described signal processor adopts based on GPU signal processing technology;

This system is used for:

1) APCOI subsystem monitor data, is received;

2) TX02 subsystem monitor data, is received;

3) RX03 subsystem monitor data, is received;

4) SPTE04 subsystem monitor data, is shown;

5) the various clock signals needed for calibration, are produced;

6), amplitude, phase place calibration and first phase calibration are carried out to transmitting binary channels;

7), reception binary channels is carried out to amplitude, phase place calibration and carried out Noise Calibration.

2. according to polarization Doppler Weather Radar system according to claim 1, it is characterized in that: described antenna servo subsystem adopts rotary parabolic surface antenna, and is provided with paraboloid of revolution protective cover;

The parameter of this subsystem is:

1), frequency: X-band;

2), polarization mode: level, vertical dual linear polarization;

3), diameter: 1.8m;

4), gain: >=40dB;

5), minor level :≤-27dB;

6), electric axis sensing wave beam major axes orientation is poor :≤0.1.；

7), antenna scanning mode: PPI, RHI, body are swept, fan sweeping, fixed point;

8), antenna scanning scope: orientation 0 ~ 360.; Pitching 0 ~ 90.；

9), antenna scanning speed: orientation 1 ~ 4rpm; Pitching 1 ~ 2rpm.