CN201489113U - Mid frequency acquisition equipment - Google Patents
Mid frequency acquisition equipment Download PDFInfo
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- CN201489113U CN201489113U CN2009201690973U CN200920169097U CN201489113U CN 201489113 U CN201489113 U CN 201489113U CN 2009201690973 U CN2009201690973 U CN 2009201690973U CN 200920169097 U CN200920169097 U CN 200920169097U CN 201489113 U CN201489113 U CN 201489113U
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- intermediate frequency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The utility model discloses mid frequency acquisition equipment used for an S waveband radar receiver. The mid frequency acquisition equipment comprises an A/D converter used for sampling the mid frequency echo signal and carrying out A/D conversion, a data latch used for latching the A/D converting data, an isolation equipment used for insulating electromagnetism, and a data output end, wherein the data latch is connected with the A/D converter, the isolation equipment is connected with the data latch, the data output end is connected with the isolation equipment, and what is better, the data output end is a fiber interface. The equipment can improve the system stability and antijamming capability, enhance the system flexibility, and at the same time increase the transmission distance of the data.
Description
Technical field
The utility model relates to the communications field, relates in particular to a kind of intermediate frequency harvester that is applied to the S-band radar receiver.
Background technology
The S-band Doppler radar can monitor that radius is a precipitation weather on a large scale such as typhoon, heavy rain, squall line, hail, spout in the 400 kilometer range areas, for industrial and agricultural production and people's lives provide the weather forecast service.
Radar transmitter is to the spatial emission pulse electromagnetic wave, and electromagnetic wave enters receiver by antenna after by the back scattering of weather target, by becoming intermediate-freuqncy signal after multistage amplification, filtering and the mixing.Intermediate-frequency receiver adopts full analog form intermediate-freuqncy signal to be carried out processing such as filtering, mixing and obtains analog video I, Q signal.Because adopt full analog form to realize that system performance is subjected to temperature, humidity and effect of electromagnetic radiation very big, stability is not high, has restricted radar performance greatly, has reduced system's detectivity.
What the S-band Doppler radar intermediate frequency processor of prior art adopted is the analog intermediate frequency scheme, its functional block diagram as shown in Figure 1, the reference clock CLK that is provided by radar system passes through PLL (Phase LockedLoop, phaselocked loop) phase-locked generation two-way orthogonal signal (sin and cos), carry out mixing with echo signal of intermediate frequency IF, realize the echo quadrature demodulation, obtain zero intermediate frequency signals, final output video I, Q signal are to the back end signal processor behind this signal process simulation low-pass filter and the withdrawal device.There is following defective in it: adopt analog form to realize down-converted, device is affected by environment big, poor stability; PLL, LPF (Low-PassFilter, low-pass filter) and withdrawal device are preset parameter, just can not revise underaction, bad adaptability once setting; The analog quadrature demodulation precision is low, and I, Q orthogonality are poor; Be output as analog form, transmission range weak point and signal are subject to disturb, and finally influence system performance; The back end signal processor also need carry out the A/D conversion after receiving I, Q signal, increased the complexity of signal Processing end.
In summary, the S-band radar receiver of described prior art obviously exists inconvenience and defective, so be necessary to be improved on reality is used.
The utility model content
At above-mentioned defective, the purpose of this utility model is to provide a kind of intermediate frequency harvester, and it can improve system stability and antijamming capability, enhanced system dirigibility, and the transmission range of increase data.
To achieve these goals, the utility model provides a kind of intermediate frequency harvester, is applied to the S-band radar receiver, and described intermediate frequency harvester comprises:
One is used for A/D converter that echo signal of intermediate frequency is sampled and carried out A/D conversion;
One is used for the A/D translation data is carried out the latched data latch, and described data latches is connected in described A/D converter;
One is used for the spacer assembly of electromagnetic isolation, and described spacer assembly is connected in described data latches;
One is used for the data output end of data output, and described data output end is connected in described spacer assembly.
According to intermediate frequency harvester of the present utility model, described spacer assembly is for adopting the high-speed figure isolator of dual power supply.
According to intermediate frequency harvester of the present utility model, described data latches is the 74AHC574 data latches.
According to intermediate frequency harvester of the present utility model, described data output end is an optical fiber interface.
According to intermediate frequency harvester of the present utility model, the chip of described optical fiber interface is HDMP1034.
According to intermediate frequency harvester of the present utility model, described A/D converter adopts the High Speed High Precision ADC chip.
The utility model is by gathering intermediate-freuqncy signal with an A/D converter, and carry out A/D and change, realize the digitizing of signal, one data latches is set can allow the output of data more stable, and pass through the output that a data output end is realized data, and establishing a spacer assembly between data output end and data latches to reduce the interference between signal.Be more preferably, data output end is an optical fiber interface, can realize the long-distance transmissions of data, and the utility model can improve system stability and antijamming capability whereby, enhanced system dirigibility, and the transmission range of increase data.
Description of drawings
Fig. 1 is the circuit structure diagram of prior art S-band radar receiver intermediate frequency processor;
Fig. 2 is the circuit structure diagram of the utility model intermediate frequency harvester.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 2 is the circuit structure diagram of the utility model intermediate frequency harvester, and this intermediate frequency harvester 100 is applied to the S-band radar receiver, and it comprises
One A/D converter 10 is used for echo signal of intermediate frequency is sampled, and carries out the A/D conversion;
One data latches 20 is connected in A/D converter 10, is used for by sampling clock the A/D translation data being latched;
One spacer assembly 30 is connected in data latches 20, is used for inter-stage is carried out electromagnetic isolation, reduces the interference between signal;
One data output end 40 is connected in spacer assembly 30, is used to realize the output of data.
Preferably, A/D converter 10 adopts the High Speed High Precision ADC chip, maximum sampling rate can reach 105Msps, 14 of sampling precisions, SFDR (Spurious Free Dynamic range, Spurious Free Dynamic Range) can reach 100dB, typical signal to noise ratio (S/N ratio) is 74dB, has effectively promoted system sensitivity and linear dynamic range.Echo signal of intermediate frequency is exported 14 bit digital quantity after the A/D Direct Sampling.
Be more preferably, spacer assembly 30 is high-speed figure isolators, and this high-speed figure isolator adopts the electromagnetic isolation mode, dual power supply, and the single channel maximum data rate can reach 100Mbps, has reduced the interference of back level to prime when guaranteeing the data transmission accuracy.Simultaneously, the high-speed figure isolator divides parts such as front-end A C and isolates with the digital processes of rear end, at utmost reduces the interference of digital signal to the simulation part.
Preferably, data latches 20 adopts the 74AHC574 data latches, and clock is latch data when rising edge, guarantees that the A/D output data has enough setting up the retention time, sampling clock oppositely back obtains the clock of data as subsequent parts, guarantees that whereby data export in stationary phase.
Because radar receiver and signal Processing terminal be not in same rack, the A/D data of harvester output must be transmitted through long distance (5 meters), therefore the data output end 40 of the utility model intermediate frequency harvester 100 adopts optical fiber interface, and the optical fiber interface chip is HDMP1034, its data transfer mode is the parallel data input, serial output, peak transfer rate can reach 1.4GBd.
Because the utility model has adopted the High Speed High Precision ADC device, has effectively improved system sensitivity and dynamic range; As the A/D data transmission media, strengthen system flexibility with optical fiber, enlarged application; The intermediate-freuqncy signal Direct Sampling has made full use of the advantage of software and radio technique, and analog intermediate frequency has been realized the breakthrough on the performance relatively.
Specify the course of work of the utility model intermediate frequency harvester 100 below.
A/D converter 10 is directly sampled to echo signal of intermediate frequency, and sampling clock is provided by radar system, to guarantee system's coherent.A/D converter 10 samplings are also carried out 14 high-speed parallel data of A/D conversion back output, latch by sampling clock through data latches 20, effectively establish setting up the retention time of data, the data of transmission send data output end 40 to after by spacer assembly 30 after latching, and then are sent to rearmounted level.Spacer assembly 30 divides parts such as front-end A C and isolates with the digital processes of rear end, at utmost reduce the interference of digital signal to the simulation part; Data output end 40 adopts optical fiber interface, has realized the long-distance transmissions of high-speed a/d data whereby, and transfer rate is fast, the precision height, and good stability effectively improves system flexibility and reliability, makes intermediate frequency harvester 100 final output high-speed a/d data.Better, the sampling clock frequency that the utility model is used is 52.753MHz, and other technical indicator is as follows: noise (N_floor)≤-110dBFS; Signal to noise ratio (snr) 〉=60dB; Signal-to-Noise-and-distortion ratio (SINAD): 〉=58dB.
In sum, the utility model is by gathering intermediate-freuqncy signal with an A/D converter, and carry out A/D and change, realize the digitizing of signal, one data latches is set can allow the output of data more stable, and pass through the output that a data output end is realized data, and establishing a spacer assembly between data output end and data latches to reduce the interference between signal.Be more preferably, data output end is an optical fiber interface, can realize the long-distance transmissions of data, and the utility model can improve system stability and antijamming capability whereby, enhanced system dirigibility, and the transmission range of increase data.
Certainly; the utility model also can have other various embodiments; under the situation that does not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the utility model.
Claims (6)
1. an intermediate frequency harvester is applied to the S-band radar receiver, it is characterized in that, described intermediate frequency harvester comprises:
One is used for A/D converter that echo signal of intermediate frequency is sampled and carried out A/D conversion;
One is used for the A/D translation data is carried out the latched data latch, and described data latches is connected in described A/D converter;
One is used for the spacer assembly of electromagnetic isolation, and described spacer assembly is connected in described data latches;
One is used for the data output end of data output, and described data output end is connected in described spacer assembly.
2. intermediate frequency harvester according to claim 1 is characterized in that, described spacer assembly is for adopting the high-speed figure isolator of dual power supply.
3. intermediate frequency harvester according to claim 1 is characterized in that, described data latches is the 74AHC574 data latches.
4. intermediate frequency harvester according to claim 1 is characterized in that, described data output end is an optical fiber interface.
5. intermediate frequency harvester according to claim 4 is characterized in that, the chip of described optical fiber interface is HDMP1034.
6. intermediate frequency harvester according to claim 1 is characterized in that, described A/D converter adopts the High Speed High Precision ADC chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201690973U CN201489113U (en) | 2009-08-14 | 2009-08-14 | Mid frequency acquisition equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201690973U CN201489113U (en) | 2009-08-14 | 2009-08-14 | Mid frequency acquisition equipment |
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| Publication Number | Publication Date |
|---|---|
| CN201489113U true CN201489113U (en) | 2010-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201690973U Expired - Fee Related CN201489113U (en) | 2009-08-14 | 2009-08-14 | Mid frequency acquisition equipment |
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| Country | Link |
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| CN (1) | CN201489113U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459732A (en) * | 2018-12-21 | 2019-03-12 | 电子科技大学 | A kind of method for identifying and classifying of wideband radar interference signal |
-
2009
- 2009-08-14 CN CN2009201690973U patent/CN201489113U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459732A (en) * | 2018-12-21 | 2019-03-12 | 电子科技大学 | A kind of method for identifying and classifying of wideband radar interference signal |
| CN109459732B (en) * | 2018-12-21 | 2020-05-05 | 电子科技大学 | Identification and classification method for broadband radar interference signals |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20140814 |
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| EXPY | Termination of patent right or utility model |