CN105334500B - A kind of S-band radar system frequency source - Google Patents
A kind of S-band radar system frequency source Download PDFInfo
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- CN105334500B CN105334500B CN201510821046.4A CN201510821046A CN105334500B CN 105334500 B CN105334500 B CN 105334500B CN 201510821046 A CN201510821046 A CN 201510821046A CN 105334500 B CN105334500 B CN 105334500B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
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Abstract
The invention discloses a kind of S-band radar system frequency source, including DDS and interface control module, frequency synthesizer module.DDS and interface control module include fpga core control module, interface control circuit, DDS circuit, clock control circuit, RS422 interface circuits；Interface control circuit realizes the control of TTL single ended inputs/output signal；DDS circuit realizes that impulse waveform produces；Clock control circuit realizes the control of input reference clock；RS422 interface circuits are realized to communicate with the data of outside.Frequency synthesizer module includes reference source circuit, up-conversion link, control circuit；Reference source circuit produces DDS clock signals；Up-conversion link output transmitting pumping signal；Control circuit receives external power source and is conveyed to each circuit after DC DC conversions.The present invention has extremely wide frequency range, good Spurious suppression performance, higher output spectrum purity, high frequency resolution, can produce the waveforms such as frequency modulation, amplitude modulation and output frequency is easily controllable, small volume, cost are low, small power consumption.
Description
Technical field
The invention belongs to radar system field, more particularly to a kind of frequency source of S-band radar system.
Background technology
S-band radar system to the precision of frequency source, resolution ratio, the purity of frequency spectrum, phase noise and frequency hopping conversion time,
The performance requirement of volume etc. is higher.This requires to select rational frequency synthesis mode, and existing main frequency synthesis mode has：Directly
Connect analog synthesis technology, Direct Digital and indirect frequency synthesis technique.
Direct analog synthesis technology is a kind of relatively broad technology of early application.The advantages of technology be have it is extremely low
Phase noise and minimum frequency switching time, but shortcoming is to realize that equipment volume is big, power consumption is big and be also easy to produce excessive miscellaneous
Component is dissipated, the purity of frequency spectrum is not high, it is difficult to suppresses the non-linear effects of hardware.
Direct Digital represents the direction of frequency synthesis technique, is the digitized key of Microwave Frequency Source.Should
The advantages of technology is the fast frequency switching of Phase Continuation, high frequency resolution, can produce waveforms such as frequency modulation, amplitude modulation and small
Volume, low cost etc., but its limited working frequency, higher mutually make an uproar and the spuious use range for limiting it.
Indirect frequency synthesis is the frequency synthesizer formed using phase-locked loop pll, is that a kind of application is relatively broad at this stage
Technology.The advantages of indirect frequency synthesis technique：With extremely wide frequency range, good Spurious suppression performance, output spectrum
Purity is very high, and output frequency is easily controllable, and small volume, cost are low etc..But shortcoming is that frequency switching time is longer, frequency point
Resolution is limited.
Frequency source synthesis mode above can not fully meet the requirement of S-band radar system.
The content of the invention
The present invention seeks to solve the problems, such as that existing frequency synthesis technique is not suitable for using in radar system, there is provided
A kind of S-band radar system frequency source.
Technical scheme is as follows：
A kind of S-band radar system frequency source, including DDS and interface control module, frequency synthesizer module；
The DDS and interface control module include fpga core control module, interface control circuit, DDS circuit, when clock
Circuit processed, RS422 interface circuits, are produced and Interface Controller for waveform；
The fpga core control module respectively with the interface control circuit, DDS circuit, clock control circuit, RS422
Interface circuit is connected, UART controls, the signal acquisition of TTL single ended signals, TTL Single-end outputs for RS422 communications
State control, the input reference clock FPGA_CLK control of signal, and control DDS chips to produce ripple by DDS controllers
Shape, output linearity FM signal；
The interface control circuit includes TTL single ended inputs interface, TTL Single-end outputs interface, signal acquisition module, AGC/
Frequency hopping controller, the road TTL single ended signals of TTL single ended inputs interface 16, is sent by the signal acquisition module
Enter fpga core control module, complete the collection of TTL single ended signals；Fpga core control module passes through the AGC/ frequency hoppings
Controller makes the TTL Single-end outputs interface export 16 road TTL single-end output signals, completes the control of TTL single-end output signals；
The DDS circuit includes DDS chips, DDS controllers, and the DDS controllers receive fpga core control module
Control signal, the DDS chips are controlled to realize the generation of waveform, output 180MHz bandwidth maximums 11MHz linear FM signal；
The clock control circuit includes clock controller, and the clock controller receives 100MHz reference clock
FPGA_CLK signals, fpga core control module is sent into, completes input reference clock FPGA_CLK control；
The RS422 interface circuits include RS422 interfaces, URAT controllers, and the RS422 interfaces include 2 road RS485-
4W/RS422 signals, fpga core control module is connected to by the URAT controllers, completes the UART controls of RS422 communications
System, realize that DDS and interface control module and the data of outside communicate；
The frequency synthesizer module includes reference source circuit, up-conversion link, control circuit；
The reference source circuit produces 1000MHz DDS clock signals using Direct synthesis technique by frequency multiplier；
The up-conversion link uses superhet frequency mixing technique and indirect frequency synthesis technique, makes DDS and the interface control
180MHz baseband signals caused by molding block and 3180MHz ± 80MHz caused by PLL local oscillation signal are through being mixed, filtering, adjusting
3000MHz ± 80MHz transmitting pumping signal is exported after system, amplification；
The control circuit receives external power source and each circuit is conveyed to after DC-DC is changed, while transmits TTL by interface
Signal carries out the control of PLL frequency hoppings and switch.
The method have the benefit that：
Invention introduces DDS, PLL, directly synthesize the agile frequency technique that is combined so that traditional frequency source possesses
Extremely wide frequency range, good Spurious suppression performance, higher output spectrum purity, high frequency resolution, can be produced
Waveforms such as raw frequency modulation, amplitude modulation and the advantages that output frequency is easily controllable, and small volume, cost are low, small power consumption.
Simultaneity factor employs modular technology, signal self-test survey technology, improves system reliability and electromagnetic shielding energy
Power, reduce system bulk, reduce maintenance difficulty.
Brief description of the drawings
Fig. 1 is the DDS and interface control module theory diagram of the present invention.
Fig. 2 is the frequency synthesizer module principle block diagram of the present invention.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings.
S-band radar system frequency source of the present invention includes DDS and interface control module, frequency synthesizer module.
DDS and interface control module mainly complete Interface Controller and waveform produces function, and its theory diagram is as shown in Figure 1.
DDS and interface control module include fpga core control module, DDS controllers, DDS chips, clock controller, URAT controls
Device, signal acquisition module, AGC/ frequency hopping controllers, RS422 interfaces, TTL single ended inputs interface, TTL Single-end output interfaces.
Wherein signal acquisition module, AGC/ frequency hopping controllers, TTL single ended inputs interface, TTL Single-end outputs interface composition connect
Mouth control circuit.Interface control circuit mainly realizes the control to TTL single ended signals and TTL single-end output signals.
DDS controllers, DDS chips (AD9910) composition DDS circuit.DDS circuit mainly realizes the generation of impulse waveform.
Clock controller forms clock control circuit.Clock control circuit is mainly realized to input reference clock FPGA_CLK
Control
URAT controllers, RS422 interfaces composition RS422 interface circuits.RS422 interface circuits mainly realize DDS and interface
Control module communicates with the data of outside.
Fpga core control module realizes the UART controls of RS422 communications, the signal acquisition of TTL single ended signals, TTL
State control, the input reference clock FPGA_CLK control of single-end output signal, and DDS cores are controlled by DDS controllers
Piece realizes the generation of waveform, output 180MHz bandwidth maximums 11MHz linear FM signal.
DDS and interface control module meet high frequency resolution required by radar system, can produce the waveforms such as frequency modulation, amplitude modulation
And output frequency is easily controllable, small volume, cost are low, small power consumption, in light weight etc. require.
Frequency synthesizer module principle block diagram is as shown in Figure 2.Frequency synthesizer module includes reference source circuit, up-conversion link, control circuit
Three parts.
Reference source circuit produces 1000MHz DDS clock signals using Direct synthesis technique by frequency multiplier.
Up-conversion link uses superhet frequency mixing technique and indirect frequency synthesis technique.DDS and interface control module
180MHz baseband signals, with PLL caused by local oscillation signal 3180MHz ± 80MHz exported after being mixed, filter, modulate, amplify
3000MHz ± 80MHz transmitting pumping signal Ft.
Control circuit receives external power source and each circuit is conveyed to after DC-DC is changed, while transmits TTL signal by interface
Carry out the control of PLL frequency hoppings and switch.
Above-described is only the preferred embodiment of the present invention, and the invention is not restricted to above example.It is appreciated that this
Other improvement and become that art personnel directly export or associated without departing from the spirit and concept in the present invention
Change, be considered as being included within protection scope of the present invention.
Claims (1)
- A kind of 1. S-band radar system frequency source, it is characterised in that：Including DDS and interface control module, frequency synthesizer module；The DDS and interface control module include fpga core control module, interface control circuit, DDS circuit, clock control electricity Road, RS422 interface circuits, for waveform generation and Interface Controller；The fpga core control module respectively with the interface control circuit, DDS circuit, clock control circuit, RS422 interfaces Circuit is connected, UART controls, the signal acquisition of TTL single ended signals, TTL single-end output signals for RS422 communications State control, input reference clock FPGA_CLK control, and control DDS chips to produce waveform by DDS controllers, it is defeated Cutting edge aligned FM signal；The interface control circuit includes TTL single ended inputs interface, TTL Single-end outputs interface, signal acquisition module, AGC/ frequency hoppings Controller, the road TTL single ended signals of TTL single ended inputs interface 16, is sent into by the signal acquisition module Fpga core control module, complete the collection of TTL single ended signals；Fpga core control module passes through the AGC/ frequency hoppings control Device processed makes the TTL Single-end outputs interface export 16 road TTL single-end output signals, completes the control of TTL single-end output signals；The DDS circuit includes DDS chips, DDS controllers, and the DDS controllers receive the control of fpga core control module Signal, the DDS chips are controlled to realize the generation of waveform, output 180MHz bandwidth maximums 11MHz linear FM signal；The clock control circuit includes clock controller, and the clock controller receives 100MHz reference clock FPGA_CLK Signal, fpga core control module is sent into, completes input reference clock FPGA_CLK control；The RS422 interface circuits include RS422 interfaces, URAT controllers, and the RS422 interfaces include 2 road RS485-4W/ RS422 signals, fpga core control module is connected to by the URAT controllers, completes the UART controls of RS422 communications, it is real Existing DDS and interface control module communicate with the data of outside；The frequency synthesizer module includes reference source circuit, up-conversion link, control circuit；The reference source circuit produces 1000MHz DDS clock signals using Direct synthesis technique by frequency multiplier；The up-conversion link uses superhet frequency mixing technique and indirect frequency synthesis technique, makes DDS and the Interface Controller mould 180MHz baseband signals caused by block and 3180MHz ± 80MHz caused by PLL local oscillation signal are through being mixed, filtering, modulating, putting Output 3000MHz ± 80MHz transmitting pumping signal after big；The control circuit receives external power source and each circuit is conveyed to after DC-DC is changed, while transmits TTL signal by interface Carry out the control of PLL frequency hoppings and switch.
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| CN201510821046.4A CN105334500B (en) | 2015-11-23 | 2015-11-23 | A kind of S-band radar system frequency source |
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| CN105334500B true CN105334500B (en) | 2017-12-01 |
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| CN107728705A (en) * | 2017-09-12 | 2018-02-23 | 北京无线电测量研究所 | A kind of Waveform generating apparatus and method based on ethernet communication |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11150421A (en) * | 1997-11-17 | 1999-06-02 | Mitsubishi Electric Corp | Frequency synthesizer |
| US6693580B1 (en) * | 2002-09-04 | 2004-02-17 | Northrop Grumman Corporation | Multifunction millimeter-wave system for radar, communications, IFF and surveillance |
| CN102073032A (en) * | 2010-11-02 | 2011-05-25 | 中国兵器工业第二○六研究所 | Modular generation method for multi-waveform radar signal |
| CN201947248U (en) * | 2011-02-11 | 2011-08-24 | 成都联帮微波通信工程有限公司 | S wave band agile frequency synthesizer |
| GB2517710A (en) * | 2013-08-28 | 2015-03-04 | Aveillant Ltd | Radar system and associated apparatus and methods |
| CN205176262U (en) * | 2015-11-23 | 2016-04-20 | 无锡市雷华科技有限公司 | S wave band radar system frequency source |
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