CN105429654A - Frequency synthesizer for S-band wave observation radar - Google Patents
Frequency synthesizer for S-band wave observation radar Download PDFInfo
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- 238000002156 mixing Methods 0.000 claims description 8
- 238000010897 surface acoustic wave method Methods 0.000 claims description 6
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- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000003786 synthesis reaction Methods 0.000 abstract description 5
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
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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
- G01S7/28—Details of pulse systems
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
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- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
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Abstract
The invention provides a frequency synthesizer for an S-band wave observation radar. The frequency synthesizer comprises a first local oscillation generation module, a radio frequency generation module, a 740 MHz amplifying module and a second local oscillation generation module, wherein the 740 MHz amplifying module outputs two paths of signals; one path of the signals are connected to the radio frequency generation module, and the other path of the signals are connected to the second local oscillation generation module; the radio frequency generation module is connected with the first local oscillation generation module and the 740 MHz amplifying module; and the second local oscillation generation module is connected with the 740 MHz amplifying module. The frequency synthesizer has the advantage that three stable radio frequency signals are output after frequency synthesis is conducted on four output signals generated by a synchronous controller of the S-band wave observation radar, wherein the three stable radio frequency signals comprise one radio frequency signal provided for a transmitter of the S-band wave observation radar, and two local oscillation signals provided for an analog front end of the S-band wave observation radar.
Description
Technical field
The present invention relates to microwave Doppler Radar Technology field, particularly relate to a kind of S-band wave observation radar frequency synthesizer.
Background technology
Microwave Doppler wave observation radar is a kind of based on doppler principle, by orbital velocity and the echo strength of continuous measurement all directions water particle, utilizes linear ocean wave theory to obtain the New Type Radar of ocean wave spectrum and ocean wave parameter.The certainty of measurement of radar is high, antenna volume is little, environmental interference is few, is easy to the round-the-clock real-time measurement realizing wave.Meanwhile, microwave Doppler wave observation radar has higher resolution, accurately can reflect the detailed information on sea, have important value, be with a wide range of applications to ocean environment observation, oceanographic survey and scientific research of seas.Therefore, many countries all microwave Doppler radar wave measuring technique at develop actively, and it can be used as the important component part in oceanographic observation system.But, for the frequency synthesis technique of marine environmental monitoring S-band wave observation radar, it is the important technical links in the type radar design process of hardware, it is the exciting signal source of transmitter, also be the local oscillator of receiver, the design hardware approach of high efficiency, low cost has more and more been subject to the attention of researchers.
At present, actual frequency combining apparatus mainly adopts four kinds of technology: direct modeling synthetic method, phase-locked loop synthetic method, direct digital synthesizers method and phase-locked loop and digit synthesis associated methods.Wherein direct modeling synthetic method utilizes frequency multiplication, frequency division and filtering to produce multiple required frequency from single-frequency, and the frequency switching time of the method is fast, but volume is large, power consumption is large; Phase-locked loop synthetic method, by the phase-locked all kinds of computings completing frequency, the designs simplification of the method, is convenient to integrated, and spectral purity is high, but there is the contradiction between high-resolution and change-over time; Direct digital synthesis technique utilizes computer technology, and its method resolution is high, and change-over time is short, and output factors letter is few, but the shortcoming of the method to be cost higher, and the synthesis of optional frequency can not be accomplished, directly can not produce the signal of S-band; The general principle of the method that Direct Digital Frequency Synthesizers and phase-locked loop combine is, the signal of certain frequency is first produced by Direct Digital Frequency Synthesizers, the signal of higher frequency is generated again by phase-locked loop, the method can produce the signal of assigned frequency, its shortcoming is that phase noise is larger, device is more, complex circuit.
Summary of the invention
Technical problem to be solved by this invention overcomes the deficiencies in the prior art, provides a kind of frequency synthesizer of S-band wave observation radar.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of S-band wave observation radar frequency synthesizer, comprises the first local oscillator generation module, radio frequency generation module, 740MHz amplification module and the second local oscillator generation module;
The input of described first local oscillator generation module is for inputting simple signal F1, the output of described first local oscillator generation module is divided into two-way, a wherein road sine wave output signal LO1, to the AFE (analog front end) of S-band wave observation radar, as its first local oscillation signal, another road connects the first input end of radio frequency generation module; The input of described 740MHz amplification module is for inputting simple signal F3, and the output of described 740MHz amplification module is divided into two-way, and wherein a road connects the second input of radio frequency generation module, and another road connects the first input end of the second local oscillator generation module; 3rd input of described radio frequency generation module is used for input linear FMICW signal F2, and the output of described radio frequency generation module is used for output linearity FMICW signal RF and launches to the transmitter of S-band wave observation radar; Second input of described second local oscillator generation module is used for input linear Continuous Wave with frequency modulation signal F4, the output output linearity Continuous Wave with frequency modulation signal LO2 of described second local oscillator generation module, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal.
Wherein, described first local oscillator generation module, the amplifier connected successively, band pass filter, a Π type resistors match network and a power splitter is comprised from input to output, wherein, the input input of described amplifier be simple signal F1, that one of them output of described power splitter exports is sine wave signal LO1, to the AFE (analog front end) of S-band wave observation radar, as its first local oscillation signal, another exports the first input end that termination connects radio frequency generation module;
Described radio frequency generation module, first frequency mixer connected successively is comprised from input to output, first band pass filter, Π type resistors match network, first amplifier, second frequency mixer, second band pass filter, second amplifier and the 3rd band pass filter, wherein, two inputs of described first frequency mixer are respectively as the 3rd input of described radio frequency generation module and the second input, for the output signal of input linear FMICW signal F2 and 740MHz amplification module, the wherein input of described second frequency mixer is as the first input end of described radio frequency generation module, for accessing the first local oscillator generation module, the output of described 3rd band pass filter is as the output of described radio frequency generation module, launch to the transmitter of S-band wave observation radar for output linearity FMICW signal RF,
Described 740MHz amplification module, the amplifier connected successively, Surface Acoustic Wave Filter, a Π type resistors match network and a power splitter is comprised from input to output, wherein, described amplifier input input be simple signal F3, two outputs of described power splitter access the second input of radio frequency generation module and the first input end of the second local oscillator generation module respectively;
Described second local oscillator generation module, first amplifier connected successively is comprised from input to output, first band pass filter, frequency mixer, Π type resistors match network, second band pass filter, second amplifier and the 3rd band pass filter, wherein, the input of described first amplifier is as the second input of described second local oscillator generation module, for input linear Continuous Wave with frequency modulation signal F4, another input of described frequency mixer is as the first input end of described second local oscillator generation module, for accessing 740MHz amplification module, the output of described 3rd band pass filter is as the output of described second local oscillator generation module, for output linearity Continuous Wave with frequency modulation signal LO2, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal.
Wherein, four input signals of described frequency synthesizer are respectively 1 linear frequency modulation continuous wave signal F4 that S-band wave observation radar signal source produces, 1 linear frequency modulation interrupts continuous wave signal F2 and 2 simple signal, are respectively simple signal F1 and simple signal F3;
Described simple signal F1 is sine wave signal, and frequency is 2170-2370MHz, and power is-6dBm;
Described simple signal F3 is sine wave signal, and frequency is 740MHz, and power is-4dBm;
The centre frequency of described linear frequency modulation continuous wave signal F4 is 201.5MHz, and bandwidth is 30MHz, and power is-24dBm;
The centre frequency that described linear frequency modulation interrupts continuous wave signal F2 is 160MHz, and bandwidth is 30MHz, and power is-13dBm;
Wherein, the described simple signal F1 of input and simple signal F3 can be irrelevant.
Wherein, four input signals of described frequency synthesizer are through described frequency synthesizer, export a frequency be (2750-2950) ± 15MHz linear frequency modulation interrupt continuous wave signal RF launch to the transmitter of S-band wave observation radar, the bandwidth that described linear frequency modulation interrupts continuous wave signal RF is 30MHz, and power is 0dBm; Export the sine wave signal LO1 that a frequency is 2170-2370MHz, to the AFE (analog front end) of S-band wave observation radar, as its first local oscillation signal, its power is+7dBm; Export the linear frequency modulation continuous wave signal LO2 that a frequency is 538.5MHz, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal, its bandwidth is 30MHz, and power is 7dBm.
Wherein, in described first local oscillator generation module, described amplifier adopts GALI-84+, its gain >=18dB, and noise factor≤4.5, export 3 rank section >=34dB;
Described band pass filter adopts the BFCN-2275+ of Mini-Circuits company, free transmission range 2170-2380MHz, loss≤3dB, stopband attenuation >=30dB;
Described power splitter adopts SP-2U2+, frequency range 1720-2850MHz, Insertion Loss≤4dB, isolation >=20dB, unbalance in phase≤1o, amplitude imbalance≤0.2dB;
The power of the simple signal F1 of described first local oscillator generation module input is-6dBm, and the two paths of signals power that the Π type resistors match network adjusted in described first local oscillator generation module makes described first local oscillator generation module export is 7 ± 1dBm.
Wherein, in described 740MHz amplification module, described amplifier adopts GALI-74+, its gain >=24dB, and noise factor≤3, export 3 rank section >=35dB;
Described Surface Acoustic Wave Filter adopts CF740, its centre frequency 740MHz, three dB bandwidth >=7MHz, Insertion Loss≤4dB, passband fluctuation≤1dB, stopband suppression >=40dB;
Described power splitter adopts JPS-2-900, frequency range 400-900MHz, Insertion Loss≤2dB, isolation >=18dB, unbalance in phase≤1o, amplitude imbalance≤0.5dB;
The power of the simple signal F3 of described 740MHz amplification module input is-4dBm, adjusts the two paths of signals power that the Π type resistors match network in described 740MHz amplification module makes described 740MHz amplification module export and is 7 ± 1dBm.
Wherein, in described second local oscillator generation module, described first amplifier adopts GALI-74+, its gain >=24dB, and noise factor≤3, export 3 rank section >=35dB;
Described first band pass filter adopts RBP-204+, free transmission range 175-237MHz, loss≤3dB, stopband attenuation >=35dB;
Described frequency mixer adopts ADE-4, radio-frequency head frequency range 200-1000MHz, local oscillator end frequency range 200-1000MHz, medium frequency output end frequency range DC-800MHz, conversion loss≤8dB, isolation >=40dB;
Described second amplifier adopts GALI-84+, its gain >=18dB, and noise factor≤4.5, export 3 rank section >=34dB;
Second band pass filter and the 3rd band pass filter all adopt SXBP-507+, free transmission range 460-560MHz, loss≤2dB, stopband attenuation >=20dB;
The power of the linear frequency modulation continuous wave signal F4 of described second local oscillator generation module input is-24dBm, and the power of the linear frequency modulation continuous wave signal LO2 that the Π type resistors match network adjusted in described second local oscillator generation module makes described second local oscillator generation module output export is 7 ± 1dBm.
Wherein, in described radio frequency generation module, described first frequency mixer adopts ADE-4, radio-frequency head frequency range 200-1000MHz, local oscillator end frequency range 200-1000MHz, medium frequency output end frequency range DC-800MHz, conversion loss≤8dB, isolation >=40dB;
Described first band pass filter adopts BPF-A580+, free transmission range 520-640MHz, loss≤4dB, stopband attenuation >=40dB;
Described first amplifier adopts GALI-74+, gain >=24dB, and noise factor≤3, export 3 rank section >=35dB;
Described second frequency mixer adopts ADE-18W, radio-frequency head frequency range 1750-3500MHz, local oscillator end frequency range 1750-3500MHz, medium frequency output end frequency range DC-700MHz, conversion loss≤7dB, the isolation >=20dB of local oscillator radio-frequency head;
Described second amplifier adopts GALI-24+, its gain >=18dB, and noise factor≤4.5, export 3 rank section >=34dB;
Described second band pass filter and the 3rd band pass filter all adopt the BFCN-2850+ of Mini-Circuits company, free transmission range 2750-2950MHz, loss≤4dB, stopband attenuation >=20dB;
The power that the linear frequency modulation that the Π type resistors match network adjusted in described radio frequency generation module makes described radio frequency generation module output export interrupts continuous wave signal RF is 0 ± 1dBm.
Wherein, frequency be 740MHz and power be the simple signal F3 of-4dBm first through 740MHz amplification module, export two-way frequency and be 740MHz and power is the simple signal of+7dBm, deliver to radio frequency generation module and the second local oscillator generation module respectively;
Frequency range is 2170 ~ 2370MHz and power is that the simple signal F1 of-6dBm is through the first local oscillator generation module, output two-way frequency range is 2170 ~ 2370MHz and power is the simple signal of+7dBm, wherein radio frequency generation module is delivered on a road, and another road sine wave output signal LO1 is as the first local oscillation signal of S-band wave observation radar AFE (analog front end);
Described second local oscillator generation module has two-way input signal, the linear frequency modulation continuous wave signal F4 of to be swept frequency range that outside is sent here be on one tunnel 201.5 ± 15MHz, another road is the 740MHz of 740MHz amplification module output and power is the simple signal of+7dBm, after described second local oscillator generation module mixing, amplification, filtering, the linear frequency modulation continuous wave signal LO2 that output swept frequency range is 538.5 ± 15MHz, power is+7dBm, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal;
Described radio frequency generation module has three road input signals, the linear frequency modulation of to be swept frequency range that outside is sent here be on one tunnel 160 ± 15MHz interrupts continuous wave signal F2, another road is the 740MHz of 740MHz amplification module output and power is the simple signal of+7dBm, 3rd tunnel is that the swept frequency range that the first local oscillator generation module produces is 2170 ~ 2370MHz and power is the simple signal of+7dBm, through described radio frequency generation module secondary mixing, amplify, after filtering, exporting swept frequency range is (2750 ~ 2950) ± 15MHz, power is that the linear frequency modulation interruption continuous wave signal RF of 0dBm launches to the transmitter of S-band wave observation radar.
Compared with prior art, the present invention has the following advantages and beneficial effect:
1, the present invention is by carrying out suitable mixing combination to input signal, produce first local oscillation signal of sine wave signal LO1 as AFE (analog front end) that a frequency is 2170-2370MHz, produce second local oscillation signal of linear frequency modulation continuous wave signal LO2 as AFE (analog front end) that a frequency is 538.5MHz, produce a frequency be 2750-2950MHz linear frequency modulation interrupt continuous wave signal RF transmit as transmitter.The present invention need not require that simple signal F1 and F3 inputted is concerned with, and system is simple, and easily realizes.
2, the present invention is in the first local oscillator generation module, only amplification filtering is carried out to the simple signal F1 that incoming frequency is 2170-2370MHz, export the first local oscillation signal as the AFE (analog front end) of S-band wave observation radar, new spurious components can not be produced, ensure that the spectral purity of the first local oscillation signal.
3, the present invention is in 740MHz amplification module, only amplification filtering is carried out to the simple signal F3 that incoming frequency is 740MHz, its output can not produce new spurious components, ensure that its spectral purity, is conducive to the quality of output signals improving radio frequency generation module, the second local oscillator generation module.
4, the present invention is in the second local oscillator generation module, and adopt high intermediate frequency, single-conversion mode, what reduce follow-up filtering realizes difficulty, improves image frequency rejection ability.
5, the present invention is in radio frequency generation module, and the 1st frequency conversion adopts high intermediate frequency conversion system, improves image frequency rejection ability while reducing the difficulty of follow-up filtering, and the 2nd frequency conversion adopts Low Medium Frequency conversion system, reduces the requirement of input signal.
Accompanying drawing explanation
The structure composition schematic diagram of a kind of S-band wave observation radar frequency synthesizer that Fig. 1 provides for the embodiment of the present invention.
The 740MHz amplification module structure composition frame chart that Fig. 2 provides for the embodiment of the present invention.
The first local oscillator generation module structure composition frame chart that Fig. 3 provides for the embodiment of the present invention.
The second local oscillator generation module structure composition frame chart that Fig. 4 provides for the embodiment of the present invention.
The radio frequency generation module structure composition frame chart that Fig. 5 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
The structure composition schematic diagram of a kind of S-band wave observation radar frequency synthesizer that Fig. 1 provides for the embodiment of the present invention.As shown in Figure 1, a kind of S-band wave observation radar frequency synthesizer of the present invention, comprises the first local oscillator generation module, radio frequency generation module, 740MHz amplification module and the second local oscillator generation module.
The input of described first local oscillator generation module is for inputting simple signal F1, the output of described first local oscillator generation module is divided into two-way, a wherein road sine wave output signal LO1, to the AFE (analog front end) of S-band wave observation radar, as its first local oscillation signal, another road connects the first input end of radio frequency generation module; The input of described 740MHz amplification module is for inputting simple signal F3, and the output of described 740MHz amplification module is divided into two-way, and wherein a road connects the second input of radio frequency generation module, and another road connects the first input end of the second local oscillator generation module; 3rd input of described radio frequency generation module is used for input linear FMICW signal F2, and the output of described radio frequency generation module is used for output linearity FMICW signal RF and launches to the transmitter of S-band wave observation radar; Second input of described second local oscillator generation module is used for input linear Continuous Wave with frequency modulation signal F4, the output output linearity Continuous Wave with frequency modulation signal LO2 of described second local oscillator generation module, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal.
The 740MHz amplification module structure composition frame chart that Fig. 2 provides for the embodiment of the present invention.As shown in Figure 2,740MHz amplification module in this example, the amplifier connected successively, Surface Acoustic Wave Filter, a Π type resistors match network and a power splitter is comprised from input to output, wherein, described amplifier input input be simple signal F3, two outputs of described power splitter access the second input of radio frequency generation module and the first input end of the second local oscillator generation module respectively.In described 740MHz amplification module, described amplifier adopts GALI-74+, its gain >=24dB, and noise factor≤3, export 3 rank section >=35dB; Described Surface Acoustic Wave Filter adopts CF740, its centre frequency 740MHz, three dB bandwidth >=7MHz, Insertion Loss≤4dB, passband fluctuation≤1dB, stopband suppression >=40dB; Described power splitter adopts JPS-2-900, frequency range 400-900MHz, Insertion Loss≤2dB, isolation >=18dB, unbalance in phase≤1o, amplitude imbalance≤0.5dB; The power of the simple signal F3 of described 740MHz amplification module input is-4dBm, adjusts the two paths of signals power that the Π type resistors match network in described 740MHz amplification module makes described 740MHz amplification module export and is 7 ± 1dBm.
The first local oscillator generation module structure composition frame chart that Fig. 3 provides for the embodiment of the present invention.As shown in Figure 3, the first local oscillator generation module in this example, the amplifier connected successively, band pass filter, a Π type resistors match network and a power splitter is comprised from input to output, wherein, described amplifier input input be simple signal F1, that one of them output of described power splitter exports is sine wave signal LO1, to the AFE (analog front end) of S-band wave observation radar, as its first local oscillation signal, another exports the first input end that termination connects radio frequency generation module.Described amplifier adopts GALI-84+, its gain >=18dB, and noise factor≤4.5, export 3 rank section >=34dB; Described band pass filter adopts the BFCN-2275+ of Mini-Circuits company, free transmission range 2170-2380MHz, loss≤3dB, stopband attenuation >=30dB; Described power splitter adopts SP-2U2+, frequency range 1720-2850MHz, Insertion Loss≤4dB, isolation >=20dB, unbalance in phase≤1o, amplitude imbalance≤0.2dB; The power of the simple signal F1 of described first local oscillator generation module input is-6dBm, and the two paths of signals power that the Π type resistors match network adjusted in described first local oscillator generation module makes described first local oscillator generation module export is 7 ± 1dBm.
The second local oscillator generation module structure composition frame chart that Fig. 4 provides for the embodiment of the present invention.As shown in Figure 4, the second local oscillator generation module in this example, first amplifier connected successively is comprised from input to output, first band pass filter, frequency mixer, Π type resistors match network, second band pass filter, second amplifier and the 3rd band pass filter, wherein, the input of described first amplifier is as the second input of described second local oscillator generation module, for input linear Continuous Wave with frequency modulation signal F4, another input of described frequency mixer is as the first input end of described second local oscillator generation module, for accessing 740MHz amplification module, the output of described 3rd band pass filter is as the output of described second local oscillator generation module, for output linearity Continuous Wave with frequency modulation signal LO2, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal.Described first amplifier adopts GALI-74+, its gain >=24dB, and noise factor≤3, export 3 rank section >=35dB; Described first band pass filter adopts RBP-204+, free transmission range 175-237MHz, loss≤3dB, stopband attenuation >=35dB; Described frequency mixer adopts ADE-4, radio-frequency head frequency range 200-1000MHz, local oscillator end frequency range 200-1000MHz, medium frequency output end frequency range DC-800MHz, conversion loss≤8dB, isolation >=40dB; Described second amplifier adopts GALI-84+, its gain >=18dB, and noise factor≤4.5, export 3 rank section >=34dB; Described second band pass filter and the 3rd band pass filter all adopt SXBP-507+, free transmission range 460-560MHz, loss≤2dB, stopband attenuation >=20dB; The power of the linear frequency modulation continuous wave signal F4 of described second local oscillator generation module input is-24dBm, and the power of the linear frequency modulation continuous wave signal LO2 that the Π type resistors match network adjusted in described second local oscillator generation module makes described second local oscillator generation module output export is 7 ± 1dBm.
The radio frequency generation module structure composition frame chart that Fig. 5 provides for the embodiment of the present invention.As shown in Figure 5, radio frequency generation module in this example, first frequency mixer connected successively is comprised from input to output, first band pass filter, Π type resistors match network, first amplifier, second frequency mixer, second band pass filter, second amplifier and the 3rd band pass filter, wherein, two inputs of described first frequency mixer are respectively as the 3rd input of described radio frequency generation module and the second input, for the output signal of input linear FMICW signal F2 and 740MHz amplification module, the wherein input of described second frequency mixer is as the first input end of described radio frequency generation module, for accessing the first local oscillator generation module, the output of described 3rd band pass filter is as the output of described radio frequency generation module, launch to the transmitter of S-band wave observation radar for output linearity FMICW signal RF.Described first frequency mixer adopts ADE-4, radio-frequency head frequency range 200-1000MHz, local oscillator end frequency range 200-1000MHz, medium frequency output end frequency range DC-800MHz, conversion loss≤8dB, isolation >=40dB; Described first band pass filter adopts BPF-A580+, free transmission range 520-640MHz, loss≤4dB, stopband attenuation >=40dB; Described first amplifier adopts GALI-74+, gain >=24dB, and noise factor≤3, export 3 rank section >=35dB; Described second frequency mixer adopts ADE-18W, radio-frequency head frequency range 1750-3500MHz, local oscillator end frequency range 1750-3500MHz, medium frequency output end frequency range DC-700MHz, conversion loss≤7dB, the isolation >=20dB of local oscillator radio-frequency head; Described second amplifier adopts GALI-24+, its gain >=18dB, and noise factor≤4.5, export 3 rank section >=34dB; Described second band pass filter and the 3rd band pass filter all adopt the BFCN-2850+ of Mini-Circuits company, free transmission range 2750-2950MHz, loss≤4dB, stopband attenuation >=20dB; The power that the linear frequency modulation that the Π type resistors match network adjusted in described radio frequency generation module makes described radio frequency generation module output export interrupts continuous wave signal RF is 0 ± 1dBm.
In this example, the signal one of the input of described frequency synthesizer has four kinds of signals, four input signals are respectively 1 linear frequency modulation continuous wave signal F4 that S-band wave observation radar signal source produces, 1 linear frequency modulation interrupts continuous wave signal F2 and 2 simple signal, are respectively simple signal F1 and simple signal F3;
Described simple signal F1 is sine wave signal, and frequency is 2170-2370MHz, and power is-6dBm;
Described simple signal F3 is sine wave signal, and frequency is 740MHz, and power is-4dBm;
The centre frequency of described linear frequency modulation continuous wave signal F4 is 201.5MHz, and bandwidth is 30MHz, and power is-24dBm;
The centre frequency that described linear frequency modulation interrupts continuous wave signal F2 is 160MHz, and bandwidth is 30MHz, and power is-13dBm;
Wherein, the described simple signal F1 of input and simple signal F3 can be irrelevant.
Adopt four of frequency synthesizer described above input signals through described frequency synthesizer, export a frequency be (2750-2950) ± 15MHz linear frequency modulation interrupt continuous wave signal RF launch to the transmitter of S-band wave observation radar, the bandwidth that described linear frequency modulation interrupts continuous wave signal RF is 30MHz, and power is 0dBm; Export the sine wave signal LO1 that a frequency is 2170-2370MHz, to the AFE (analog front end) of S-band wave observation radar, as its first local oscillation signal, its power is+7dBm; Export the linear frequency modulation continuous wave signal LO2 that a frequency is 538.5MHz, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal, its bandwidth is 30MHz, and power is 7dBm.
In sum, the present invention is by carrying out suitable mixing combination to input signal, produce first local oscillation signal of sine wave signal LO1 as AFE (analog front end) that a frequency is 2170-2370MHz, produce second local oscillation signal of linear frequency modulation continuous wave signal LO2 as AFE (analog front end) that a frequency is 538.5MHz, produce a frequency be 2750-2950MHz linear frequency modulation interrupt continuous wave signal RF transmit as transmitter.The present invention need not require that simple signal F1 and F3 inputted is concerned with, and system is simple, and easily realizes.The present invention is in the first local oscillator generation module, only amplification filtering is carried out to the simple signal F1 that incoming frequency is 2170-2370MHz, export the first local oscillation signal as the AFE (analog front end) of S-band S-band wave observation radar, new spurious components can not be produced, ensure that the spectral purity of the first local oscillation signal.
The present invention is in 740MHz amplification module, only amplification filtering is carried out to the simple signal F3 that incoming frequency is 740MHz, its output can not produce new spurious components, ensure that its spectral purity, is conducive to the quality of output signals improving radio frequency generation module, the second local oscillator generation module.
The present invention is in the second local oscillator generation module, and adopt high intermediate frequency, single-conversion mode, what reduce follow-up filtering realizes difficulty, improves image frequency rejection ability.
The present invention is in radio frequency generation module, and the 1st frequency conversion adopts high intermediate frequency conversion system, improves image frequency rejection ability while reducing the difficulty of follow-up filtering, and the 2nd frequency conversion adopts Low Medium Frequency conversion system, reduces the requirement of input signal.
As shown in Figure 2, in this example, frequency be 740MHz and power be the simple signal F3 of-4dBm first through 740MHz amplification module, export two-way frequency and be 740MHz and power is the simple signal of+7dBm, deliver to radio frequency generation module and the second local oscillator generation module respectively.
As shown in Figure 3, frequency range is 2170 ~ 2370MHz and power is that the simple signal F1 of-6dBm is through the first local oscillator generation module, output two-way frequency range is 2170 ~ 2370MHz and power is the simple signal of+7dBm, wherein radio frequency generation module is delivered on a road, and another road sine wave output signal LO1 is as the first local oscillation signal of S-band wave observation radar AFE (analog front end).As shown in Figure 4, described second local oscillator generation module has two-way input signal, the linear frequency modulation continuous wave signal F4 of to be swept frequency range that outside is sent here be on one tunnel 201.5 ± 15MHz, another road is the 740MHz of 740MHz amplification module output and power is the simple signal of+7dBm, after described second local oscillator generation module mixing, amplification, filtering, the linear frequency modulation continuous wave signal LO2 that output swept frequency range is 538.5 ± 15MHz, power is+7dBm, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal.
As shown in Figure 5, described radio frequency generation module in this example has three road input signals, the linear frequency modulation of to be swept frequency range that outside is sent here be on one tunnel 160 ± 15MHz interrupts continuous wave signal F2, another road is the 740MHz of 740MHz amplification module output and power is the simple signal of+7dBm, 3rd tunnel is that the swept frequency range that the first local oscillator generation module produces is 2170 ~ 2370MHz and power is the simple signal of+7dBm, through described radio frequency generation module secondary mixing, amplify, after filtering, exporting swept frequency range is (2750 ~ 2950) ± 15MHz, power is that the linear frequency modulation of 0dBm interrupts continuous wave signal RF, this signal will deliver to S-band wave observation radar transmitter for transmitting.
Specific embodiment described herein is only to the present invention's explanation for example.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (9)
1. a S-band wave observation radar frequency synthesizer, is characterized in that: comprise the first local oscillator generation module, radio frequency generation module, 740MHz amplification module and the second local oscillator generation module;
The input of described first local oscillator generation module is for inputting simple signal F1, the output of described first local oscillator generation module is divided into two-way, a wherein road sine wave output signal LO1, to the AFE (analog front end) of S-band wave observation radar, as its first local oscillation signal, another road connects the first input end of radio frequency generation module; The input of described 740MHz amplification module is for inputting simple signal F3, and the output of described 740MHz amplification module is divided into two-way, and wherein a road connects the second input of radio frequency generation module, and another road connects the first input end of the second local oscillator generation module; 3rd input of described radio frequency generation module is used for input linear FMICW signal F2, and the output of described radio frequency generation module is used for output linearity FMICW signal RF and launches to the transmitter of S-band wave observation radar; Second input of described second local oscillator generation module is used for input linear Continuous Wave with frequency modulation signal F4, the output output linearity Continuous Wave with frequency modulation signal LO2 of described second local oscillator generation module, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal.
2. a kind of S-band wave observation radar frequency synthesizer according to claim 1, it is characterized in that: described first local oscillator generation module, the amplifier connected successively is comprised from input to output, a band pass filter, a Π type resistors match network and a power splitter, wherein, described amplifier input input be simple signal F1, that one of them output of described power splitter exports is sine wave signal LO1, to the AFE (analog front end) of S-band wave observation radar, as its first local oscillation signal, another exports the first input end that termination connects radio frequency generation module,
Described radio frequency generation module, first frequency mixer connected successively is comprised from input to output, first band pass filter, Π type resistors match network, first amplifier, second frequency mixer, second band pass filter, second amplifier and the 3rd band pass filter, wherein, two inputs of described first frequency mixer are respectively as the 3rd input of described radio frequency generation module and the second input, for the output signal of input linear FMICW signal F2 and 740MHz amplification module, the wherein input of described second frequency mixer is as the first input end of described radio frequency generation module, for accessing the first local oscillator generation module, the output of described 3rd band pass filter is as the output of described radio frequency generation module, launch to the transmitter of S-band wave observation radar for output linearity FMICW signal RF,
Described 740MHz amplification module, the amplifier connected successively, Surface Acoustic Wave Filter, a Π type resistors match network and a power splitter is comprised from input to output, wherein, described amplifier input input be simple signal F3, two outputs of described power splitter access the second input of radio frequency generation module and the first input end of the second local oscillator generation module respectively;
Described second local oscillator generation module, first amplifier connected successively is comprised from input to output, first band pass filter, frequency mixer, Π type resistors match network, second band pass filter, second amplifier and the 3rd band pass filter, wherein, the input of described first amplifier is as the second input of described second local oscillator generation module, for input linear Continuous Wave with frequency modulation signal F4, another input of described frequency mixer is as the first input end of described second local oscillator generation module, for accessing 740MHz amplification module, the output of described 3rd band pass filter is as the output of described second local oscillator generation module, for output linearity Continuous Wave with frequency modulation signal LO2, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal.
3. a kind of S-band wave observation radar frequency synthesizer according to claim 1 and 2, it is characterized in that: four input signals of described frequency synthesizer are respectively 1 linear frequency modulation continuous wave signal F4 that S-band wave observation radar signal source produces, 1 linear frequency modulation interrupts continuous wave signal F2 and 2 simple signal, are respectively simple signal F1 and simple signal F3;
Described simple signal F1 is sine wave signal, and frequency is 2170-2370MHz, and power is-6dBm;
Described simple signal F3 is sine wave signal, and frequency is 740MHz, and power is-4dBm;
The centre frequency of described linear frequency modulation continuous wave signal F4 is 201.5MHz, and bandwidth is 30MHz, and power is-24dBm;
The centre frequency that described linear frequency modulation interrupts continuous wave signal F2 is 160MHz, and bandwidth is 30MHz, and power is-13dBm;
Wherein, the described simple signal F1 of input and simple signal F3 can be irrelevant.
4. a kind of S-band wave observation radar frequency synthesizer according to claim 3, it is characterized in that: four input signals of described frequency synthesizer are through described frequency synthesizer, export a frequency be (2750-2950) ± 15MHz linear frequency modulation interrupt continuous wave signal RF launch to the transmitter of S-band wave observation radar, the bandwidth that described linear frequency modulation interrupts continuous wave signal RF is 30MHz, and power is 0dBm; Export the sine wave signal LO1 that a frequency is 2170-2370MHz, to the AFE (analog front end) of S-band wave observation radar, as its first local oscillation signal, its power is+7dBm; Export the linear frequency modulation continuous wave signal LO2 that a frequency is 538.5MHz, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal, its bandwidth is 30MHz, and power is 7dBm.
5. a kind of S-band wave observation radar frequency synthesizer according to claim 2, is characterized in that: in described first local oscillator generation module, and described amplifier adopts GALI-84+, its gain >=18dB, and noise factor≤4.5, export 3 rank section >=34dB;
Described band pass filter adopts the BFCN-2275+ of Mini-Circuits company, free transmission range 2170-2380MHz, loss≤3dB, stopband attenuation >=30dB;
Described power splitter adopts SP-2U2+, frequency range 1720-2850MHz, Insertion Loss≤4dB, isolation >=20dB, unbalance in phase≤1o, amplitude imbalance≤0.2dB;
The power of the simple signal F1 of described first local oscillator generation module input is-6dBm, and the two paths of signals power that the Π type resistors match network adjusted in described first local oscillator generation module makes described first local oscillator generation module export is 7 ± 1dBm.
6. a kind of S-band wave observation radar frequency synthesizer according to claim 2, is characterized in that: in described 740MHz amplification module, and described amplifier adopts GALI-74+, its gain >=24dB, and noise factor≤3, export 3 rank section >=35dB;
Described Surface Acoustic Wave Filter adopts CF740, its centre frequency 740MHz, three dB bandwidth >=7MHz, Insertion Loss≤4dB, passband fluctuation≤1dB, stopband suppression >=40dB;
Described power splitter adopts JPS-2-900, frequency range 400-900MHz, Insertion Loss≤2dB, isolation >=18dB, unbalance in phase≤1o, amplitude imbalance≤0.5dB;
The power of the simple signal F3 of described 740MHz amplification module input is-4dBm, adjusts the two paths of signals power that the Π type resistors match network in described 740MHz amplification module makes described 740MHz amplification module export and is 7 ± 1dBm.
7. a kind of S-band wave observation radar frequency synthesizer according to claim 2, is characterized in that: in described second local oscillator generation module, and described first amplifier adopts GALI-74+, its gain >=24dB, and noise factor≤3, export 3 rank section >=35dB;
Described first band pass filter adopts RBP-204+, free transmission range 175-237MHz, loss≤3dB, stopband attenuation >=35dB;
Described frequency mixer adopts ADE-4, radio-frequency head frequency range 200-1000MHz, local oscillator end frequency range 200-1000MHz, medium frequency output end frequency range DC-800MHz, conversion loss≤8dB, isolation >=40dB;
Described second amplifier adopts GALI-84+, its gain >=18dB, and noise factor≤4.5, export 3 rank section >=34dB;
Second band pass filter and the 3rd band pass filter all adopt SXBP-507+, free transmission range 460-560MHz, loss≤2dB, stopband attenuation >=20dB;
The power of the linear frequency modulation continuous wave signal F4 of described second local oscillator generation module input is-24dBm, and the power of the linear frequency modulation continuous wave signal LO2 that the Π type resistors match network adjusted in described second local oscillator generation module makes described second local oscillator generation module output export is 7 ± 1dBm.
8. a kind of S-band wave observation radar frequency synthesizer according to claim 2, it is characterized in that: in described radio frequency generation module, described first frequency mixer adopts ADE-4, radio-frequency head frequency range 200-1000MHz, local oscillator end frequency range 200-1000MHz, medium frequency output end frequency range DC-800MHz, conversion loss≤8dB, isolation >=40dB;
Described first band pass filter adopts BPF-A580+, free transmission range 520-640MHz, loss≤4dB, stopband attenuation >=40dB;
Described first amplifier adopts GALI-74+, gain >=24dB, and noise factor≤3, export 3 rank section >=35dB;
Described second frequency mixer adopts ADE-18W, radio-frequency head frequency range 1750-3500MHz, local oscillator end frequency range 1750-3500MHz, medium frequency output end frequency range DC-700MHz, conversion loss≤7dB, the isolation >=20dB of local oscillator radio-frequency head;
Described second amplifier adopts GALI-24+, its gain >=18dB, and noise factor≤4.5, export 3 rank section >=34dB;
Described second band pass filter and the 3rd band pass filter all adopt the BFCN-2850+ of Mini-Circuits company, free transmission range 2750-2950MHz, loss≤4dB, stopband attenuation >=20dB;
The power that the linear frequency modulation that the Π type resistors match network adjusted in described radio frequency generation module makes described radio frequency generation module output export interrupts continuous wave signal RF is 0 ± 1dBm.
9. a kind of S-band wave observation radar frequency synthesizer according to claim 2, it is characterized in that: frequency is 740MHz and power is that the simple signal F3 of-4dBm is first through 740MHz amplification module, output two-way frequency is 740MHz and power is the simple signal of+7dBm, delivers to radio frequency generation module and the second local oscillator generation module respectively;
Frequency range is 2170 ~ 2370MHz and power is that the simple signal F1 of-6dBm is through the first local oscillator generation module, output two-way frequency range is 2170 ~ 2370MHz and power is the simple signal of+7dBm, wherein radio frequency generation module is delivered on a road, and another road sine wave output signal LO1 is as the first local oscillation signal of S-band wave observation radar AFE (analog front end);
Described second local oscillator generation module has two-way input signal, the linear frequency modulation continuous wave signal F4 of to be swept frequency range that outside is sent here be on one tunnel 201.5 ± 15MHz, another road is the 740MHz of 740MHz amplification module output and power is the simple signal of+7dBm, after described second local oscillator generation module mixing, amplification, filtering, the linear frequency modulation continuous wave signal LO2 that output swept frequency range is 538.5 ± 15MHz, power is+7dBm, to the AFE (analog front end) of S-band wave observation radar, as its second local oscillation signal;
Described radio frequency generation module has three road input signals, the linear frequency modulation of to be swept frequency range that outside is sent here be on one tunnel 160 ± 15MHz interrupts continuous wave signal F2, another road is the 740MHz of 740MHz amplification module output and power is the simple signal of+7dBm, 3rd tunnel is that the swept frequency range that the first local oscillator generation module produces is 2170 ~ 2370MHz and power is the simple signal of+7dBm, through described radio frequency generation module secondary mixing, amplify, after filtering, exporting swept frequency range is (2750 ~ 2950) ± 15MHz, power is that the linear frequency modulation interruption continuous wave signal RF of 0dBm launches to the transmitter of S-band wave observation radar.
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