CN205263304U - S wave band wave observation radar radio frequency analog front end circuit - Google Patents
S wave band wave observation radar radio frequency analog front end circuit Download PDFInfo
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- CN205263304U CN205263304U CN201521088540.6U CN201521088540U CN205263304U CN 205263304 U CN205263304 U CN 205263304U CN 201521088540 U CN201521088540 U CN 201521088540U CN 205263304 U CN205263304 U CN 205263304U
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Abstract
The utility model provides a S wave band wave observation radar radio frequency analog front end circuit. Enlarge module, first mixing and intermediate -frequency amplification module, second mixing and intermediate -frequency amplification module, first local oscillator module and second local oscillator module including the radio frequency preliminary election, the input input radiofrequency signal of module is enlargied in the radio frequency preliminary election, and the output is connected with first mixing and intermediate -frequency amplification module first input end, the 1st local oscillator signal of first local oscillator module input, the output is connected with first mixing and intermediate -frequency amplification module second input, and first mixing and intermediate -frequency amplification module output are connected with second mixing and intermediate -frequency amplification module first input end, the 2nd local oscillator signal of second local oscillator module input, the output is connected with second mixing and intermediate -frequency amplification module second input, second mixing and intermediate -frequency amplification module output intermediate frequency signal. This scheme realizes being the produced three output signal output of S wave band wave observation radar frequency synthesizer stable intermediate frequency signal and supplying with the receiver.
Description
Technical field
The utility model relates to microwave Doppler Radar Technology field, relates in particular to a kind of S-band wave observation radar rf analog front-end circuit.
Background technology
The observation of wave and research have actual demand widely. From security standpoint, it and prevent and reduce natural disasters, all are marine movable closely related for marine transportation, offshore oil, sea fishery, ocean engineering and military activity etc.; From science angle, the great Science Research Project close relation such as it and the exchange of extra large gas, carbon cycle. The conventional method of obtaining drive marine mathematic(al) parameter is mainly to use the instrument field surveys such as buoy, seat bottom type pressure sensor, subsurface buoy, current meter, oceanographic research ship, offshore platform. These methods, due to problems such as operational difficulty, cost are high, spot measurements, are difficult to meet actual needs.
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 such radar is high, antenna volume is little, environmental disturbances is few, is easy to realize the round-the-clock real-time measurement of wave. Meanwhile, microwave Doppler wave observation radar has higher resolution ratio, can accurately reflect the detailed information on sea, and ocean environment observation, oceanographic survey and scientific research of seas are had to important value, is with a wide range of applications. Microwave S-band Doppler wave observation radar system adopts based on LXI bussing technique, modularization, full solid-state device Hardware platform design scheme. System is made up of small sized wide-band dual-mode antenna, high-power duplexer, power amplifier, rf analog front-end, high-speed digital receiver, synchronous and frequency synthesis, Ethernet switch, system remote monitoring and extra large state Inversion Calculation machine etc. For radar hardware components, receiver is the important component part of radar system, and it is being faced with the challenges such as high operate frequency, high integration and low-power consumption, and rf analog front-end circuit is core and key modules in receiver. Rf analog front-end generally adopts super-heterodyne architecture, Direct-conversion (zero intermediate frequency) structure, image frequency to suppress several designs such as structure and low intermediate frequency structure, be characterized in that receiver generally carries out once or once above frequency conversion, radiofrequency signal is become to baseband signal or the lower signal of frequency, through the lower low pass over-sampling of sample frequency, send into DSP and carry out digital processing. In super-heterodyne architecture, in order to improve the selective of receiver, generally to use the bandpass filter of multiple high Q values, the width phase distortion of system is larger, affect the quality of subsequent treatment, the analog device using is more, circuit structure complexity, and inconvenience is integrated, the stability of a system is poor, although and zero intermediate frequency scheme simple in structure, be easy to integrated, adaptability good, also has many masty problems, as problems such as direct current offset, even-order harmonic distortion, I/Q channel imbalance, flicker noises. Image frequency suppresses structure and low intermediate frequency structure also exists wave filter to be difficult to the shortcomings such as realization, poor anti jamming capability.
Utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, and a kind of S-band wave observation radar rf analog front-end circuit is provided.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of S-band wave observation radar rf analog front-end circuit, comprises RF preselection amplification module, the first mixing and intermediate frequency amplification module, the second mixing and intermediate frequency amplification module, the first local oscillator module and the second local oscillator module;
The input of described RF preselection amplification module is for inputting the radiofrequency signal RF that S-band wave observation radar frequency synthesizer produces, and the output of described RF preselection amplification module is connected with the first input end of the first mixing and intermediate frequency amplification module; The input of described the first local oscillator module is for inputting the 1st local oscillation signal LO1 that S-band wave observation radar frequency synthesizer produces, the output of described the first local oscillator module is connected with the second input of the first mixing and intermediate frequency amplification module, and the output of described the first mixing and intermediate frequency amplification module is connected with the first input end of the second mixing and intermediate frequency amplification module; The input of described the second local oscillator module is for inputting the 2nd local oscillation signal LO2 that S-band wave observation radar frequency synthesizer produces, the output of described the second local oscillator module is connected with the second input of the second mixing and intermediate frequency amplification module, the output of described the second mixing and intermediate frequency amplification module is used for exporting intermediate-freuqncy signal IF, processes for follow-up analog-to-digital conversion and DSP;
Wherein, described RF preselection amplification module, the first local oscillator module and the second local oscillator module are subject to the control of transmitted pulse TP, in the time that transmitted pulse TP is high level, and the equal conducting of switch of described RF preselection amplification module, the first local oscillator module and the second local oscillator module; In the time that transmitted pulse TP is low level, the switch of described RF preselection amplification module, the first local oscillator module and the second local oscillator module all ends.
Wherein, described RF preselection amplification module comprises the RF switch, a lightning protection device, limiter, first broadband band-pass filter, a radio frequency amplifier and second broadband band-pass filter that connect successively from input to output; Wherein, described RF switch is subject to the control of transmitted pulse TP, and the input of described RF switch is for inputting the radiofrequency signal RF that S-band wave observation radar frequency synthesizer produces, and the output of described second broadband band-pass filter is as the output of described RF preselection amplification module;
Described the first local oscillator module comprises the RF switch, a Π type resistors match network, an amplifier and the bandpass filter that connect successively from input to output; Wherein, described RF switch is subject to the control of transmitted pulse TP, and the input of described RF switch is for inputting the 1st local oscillation signal LO1 that S-band wave observation radar frequency synthesizer produces, and the output of described bandpass filter is as the output of described the first local oscillator module;
Described the second local oscillator module comprises the RF switch, a Π type resistors match network, an amplifier and the bandpass filter that connect successively from input to output; Wherein, described RF switch is subject to the control of transmitted pulse TP, and the input of described RF switch is for inputting the 2nd local oscillation signal LO2 that S-band wave observation radar frequency synthesizer produces, and the output of described bandpass filter is as the output of described the second local oscillator module;
Described the first mixing and intermediate frequency amplification module comprise the frequency mixer, a broadband band-pass filter and the amplifier that connect successively from input to output; Wherein, the signal that one input of described frequency mixer is exported for inputting the output of described RF preselection amplification module, the signal that another input of described frequency mixer is exported for inputting the output of described the first local oscillator module, the output of described amplifier is as the output of described the first mixing and intermediate frequency amplification module;
Described the second mixing and intermediate frequency amplification module comprise the frequency mixer, first SAW filter, first amplifier, a numerical-control attenuator, second amplifier and second SAW filter that connect successively from input to output; Wherein, the signal that one input of described frequency mixer is exported for inputting the output of described the first mixing and intermediate frequency amplification module, the signal that another input of described frequency mixer is exported for inputting the output of described the second local oscillator module, the output of described second SAW filter is as the output of described the second mixing and intermediate frequency amplification module, for exporting intermediate-freuqncy signal IF.
Wherein, three input signals of described S-band wave observation radar rf analog front-end circuit are respectively 2 local oscillation signals and 1 radiofrequency signal that S-band wave observation radar frequency synthesizer produces;
Wherein, described the 1st local oscillation signal LO1 is sine wave signal, and frequency is 2.17-2.37GHz, and power is+7dBm; Described the 2nd local oscillation signal LO2 is linear frequency modulation continuous wave signal FMCW, and frequency is 538.5MHz, and power is+7dBm; Described radiofrequency signal RF is that linear frequency modulation interrupts continuous wave signal FMICW, and frequency is 2.75-2.95GHz.
Wherein, three input signals of described S-band wave observation radar rf analog front-end circuit are through described S-band wave observation radar rf analog front-end circuit, the described intermediate-freuqncy signal IF of output is an intermediate-freuqncy signal that frequency is 41.5MHz, processes for follow-up analog-to-digital conversion and DSP.
Wherein, in described RF preselection amplification module, described lightning protection device adopts MC-6BP, and its Lightning Protection is DC earthing, bears power 200W, insertion loss≤0.2dB, and standing-wave ratio≤1.5, discharge ionization voltage is 230V;
Described limiter adopts the RLM-43-5W+ of Mini-Circuits company, be less than≤0.4dB of its Insertion Loss, clip level 10dBm ~ 37dBm, recovery time≤40ns;
Described RF switch adopts SKY13286-359LF, its insertion loss≤1dB, and isolation >=58dB, the on-off switch time is less than 50ns, and control level is Transistor-Transistor Logic level, high level conducting;
Described radio frequency amplifier adopts WHM1045LE, gain >=24dB, noise coefficient≤1.6, standing-wave ratio≤1.5;
Described first broadband band-pass filter and second broadband band-pass filter all adopt the BFCN-2850+ of Mini-Circuits company, free transmission range 2750-2950MHz, loss≤4dB, stopband attenuation >=20dB.
Wherein, in described the first mixing and intermediate frequency amplification module, described frequency mixer adopts MCA-35H+, radio-frequency head frequency range 500-3500MHz, local oscillator end frequency range 500-3500MHz, output frequency range 10-1500MHz, conversion loss≤6dB, isolation >=20dB;
Described broadband band-pass filter adopts BPF-A580+, free transmission range 520-640MHz, loss≤4dB, stopband attenuation >=40dB;
Described amplifier adopts GALI-74+, gain >=24dB, noise coefficient≤3, output 3 rank section >=35dB.
Wherein, in described the second mixing and intermediate frequency amplification module, described frequency mixer adopts LAVI-711H+, radio-frequency head frequency range 220-710MHz, local oscillator end frequency range 250-740MHz, output frequency range 10-500MHz, conversion loss≤7.5dB, isolation >=40dB;
Described first amplifier and second amplifier all adopt GALI-74+, the gain >=24dB of each amplifier, noise coefficient≤3, output 3 rank section >=35dB;
The centre frequency 41.5MHz of described first SAW filter and second SAW filter, 1dB bandwidth >=500kHz, loss≤2.5dB, passband fluctuation≤0.5dB, Out-of-band rejection >=30dB;
Described numerical-control attenuator adopts DAT-31R5-PP, attenuation range 31.5dB, and minimal attenuation stepping 0.1dB, control mode is 6 controls, control level is Transistor-Transistor Logic level.
Wherein, in described the first local oscillator module, described RF switch adopts SKY13286-359LF, its insertion loss≤1dB, and isolation >=58dB, the on-off switch time is less than 50ns, and control level is Transistor-Transistor Logic level, high level conducting;
Described amplifier adopts GALI-84+, its gain >=18dB, noise coefficient≤4.5, output 3 rank section >=34dB;
Described bandpass filter adopts the BFCN-2275+ of Mini-Circuits company, free transmission range 2170-2380MHz, loss≤3dB, stopband attenuation >=30dB; Adjusting Π type resistors match network in described the first local oscillator module, to make the power output of described the first local oscillator module be 17dBm.
Wherein, in described the second local oscillator module, described RF switch adopts SKY13286-359LF, its insertion loss≤1dB, and isolation >=58dB, the on-off switch time is less than 50ns, and control level is Transistor-Transistor Logic level, high level conducting;
Described amplifier adopts GALI-84+, its gain >=18dB, noise coefficient≤4.5, output 3 rank section >=34dB;
Described bandpass filter adopts the SXBP-507+ of Mini-Circuits company, free transmission range 460-560MHz, loss≤2dB, stopband attenuation >=20dB; Adjusting Π type resistors match network in described the second local oscillator module, to make the power output of described the second local oscillator module be 17dBm.
Wherein, in the time that transmitted pulse TP is low level, the intermediate-freuqncy signal IF of described the second mixing and the output of intermediate frequency amplification module is noise.
Compared with prior art, the utlity model has following advantage and beneficial effect:
1, the utility model is applicable to 2750MHz and receives to the radiofrequency signal in 2950MHz frequency range, is specially adapted to S-band wave observation radar system signal and receives.
2, the utility model has all adopted broadband band-pass filter at RF preselection amplification module, the first mixing and intermediate frequency amplification module, has reduced the delay of signal, and the phase distortion of rf echo signal is little.
3, the utility model has all adopted amplifier in RF preselection amplification module, the first mixing and intermediate frequency amplification module, the second mixing and intermediate frequency amplification module, has taken into account the contradiction between dynamic range and the sensitivity of AFE(analog front end).
4, the utility model utilizes transmitted pulse TP signal to control the break-make of RF preselection amplification module, the first local oscillator module and the second local oscillator module simultaneously, realize the high degree of isolation of receiving and transmitting signal, expand the dynamic range of AFE(analog front end), improved the sensitivity of receiver.
5, the 1st local oscillation signal LO1 of the utility model input is the simple signal of 2170MHz to 2370MHz, centered by the 2nd local oscillator LO2, frequency is the linear frequency modulation continuous wave FMCW signal that 538.5MHz, bandwidth are 30MHz, in the first mixing and intermediate frequency amplification module, realize down coversion, remove slope and realize in the second mixing and intermediate frequency amplification module, reduced the difficulty that the 1st local oscillation signal LO1 produces.
Brief description of the drawings
The circuit block diagram of a kind of S-band wave observation radar rf analog front-end circuit that Fig. 1 provides for the utility model embodiment.
Fig. 2 is the RF preselection amplification module structured flowchart in the utility model embodiment.
Fig. 3 is the first mixing and the intermediate frequency amplification module structured flowchart in the utility model embodiment.
Fig. 4 is the second mixing and the intermediate frequency amplification module structured flowchart in the utility model embodiment.
Fig. 5 is the first local oscillator modular structure block diagram in the utility model embodiment.
Fig. 6 is the second local oscillator modular structure block diagram in the utility model embodiment.
Detailed description of the invention
Below in conjunction with embodiment shown in the drawings, the utility model is described in further detail.
The circuit block diagram of a kind of S-band wave observation radar rf analog front-end circuit that Fig. 1 provides for the utility model embodiment. As shown in Figure 1, a kind of S-band wave observation radar rf analog front-end circuit described in the utility model, comprises RF preselection amplification module, the first mixing and intermediate frequency amplification module, the second mixing and intermediate frequency amplification module, the first local oscillator module and the second local oscillator module. Wherein, described RF preselection amplification module, the first local oscillator module and the second local oscillator module are subject to the control of transmitted pulse TP, in the time that transmitted pulse TP is high level, and the equal conducting of switch of described RF preselection amplification module, the first local oscillator module and the second local oscillator module; In the time that transmitted pulse TP is low level, the switch of described RF preselection amplification module, the first local oscillator module and the second local oscillator module all ends.
The input of described RF preselection amplification module is for inputting the radiofrequency signal RF that S-band wave observation radar frequency synthesizer produces, and the output of described RF preselection amplification module is connected with the first input end of the first mixing and intermediate frequency amplification module; The input of described the first local oscillator module is for inputting the 1st local oscillation signal LO1 that S-band wave observation radar frequency synthesizer produces, the output of described the first local oscillator module is connected with the second input of the first mixing and intermediate frequency amplification module, and the output of described the first mixing and intermediate frequency amplification module is connected with the first input end of the second mixing and intermediate frequency amplification module; The input of described the second local oscillator module is for inputting the 2nd local oscillation signal LO2 that S-band wave observation radar frequency synthesizer produces, the output of described the second local oscillator module is connected with the second input of the second mixing and intermediate frequency amplification module, the output of described the second mixing and intermediate frequency amplification module is used for exporting intermediate-freuqncy signal IF, processes for follow-up analog-to-digital conversion and DSP.
In this programme, three input signals of described S-band wave observation radar rf analog front-end circuit are respectively 2 local oscillation signals and 1 radiofrequency signal that S-band wave observation radar frequency synthesizer produces;
Described the 1st local oscillation signal LO1 is sine wave signal, and frequency is 2.17-2.37GHz, and power is+7dBm; Described the 2nd local oscillation signal LO2 is linear frequency modulation continuous wave signal FMCW, and frequency is 538.5MHz, and power is+7dBm; Described radiofrequency signal RF is that linear frequency modulation interrupts continuous wave signal FMICW, and frequency is 2.75-2.95GHz.
Three input signals of described S-band wave observation radar rf analog front-end circuit are through described S-band wave observation radar rf analog front-end circuit, the described intermediate-freuqncy signal IF of output is an intermediate-freuqncy signal that frequency is 41.5MHz, processes for follow-up analog-to-digital conversion and DSP.
Fig. 2 is the RF preselection amplification module structured flowchart in the utility model embodiment. As shown in Figure 2, in this example, described RF preselection amplification module comprises the RF switch, a lightning protection device, limiter, first broadband band-pass filter, a radio frequency amplifier and second broadband band-pass filter that connect successively from input to output; Wherein, described RF switch is subject to the control of transmitted pulse TP, and the input of described RF switch is for inputting the radiofrequency signal RF that S-band wave observation radar frequency synthesizer produces, and the output of described second broadband band-pass filter is as the output of described RF preselection amplification module. In described RF preselection amplification module, described lightning protection device adopts MC-6BP, and its Lightning Protection is DC earthing, bears power 200W, insertion loss≤0.2dB, and standing-wave ratio≤1.5, discharge ionization voltage is 230V; Described limiter adopts the RLM-43-5W+ of Mini-Circuits company, be less than≤0.4dB of its Insertion Loss, clip level 10dBm ~ 37dBm, recovery time≤40ns; Described RF switch adopts SKY13286-359LF, its insertion loss≤1dB, and isolation >=58dB, the on-off switch time is less than 50ns, and control level is Transistor-Transistor Logic level, high level conducting; Described radio frequency amplifier adopts WHM1045LE, gain >=24dB, noise coefficient≤1.6, standing-wave ratio≤1.5; Described first broadband band-pass filter and second broadband band-pass filter all adopt the BFCN-2850+ of Mini-Circuits company, free transmission range 2750-2950MHz, loss≤4dB, stopband attenuation >=20dB.
Fig. 3 is the first mixing and the intermediate frequency amplification module structured flowchart in the utility model embodiment. As shown in Figure 3, in this example, described the first mixing and intermediate frequency amplification module comprise the frequency mixer, a broadband band-pass filter and the amplifier that connect successively from input to output; Wherein, the signal that one input of described frequency mixer is exported for inputting the output of described RF preselection amplification module, the signal that another input of described frequency mixer is exported for inputting the output of described the first local oscillator module, the output of described amplifier is as the output of described the first mixing and intermediate frequency amplification module. In described the first mixing and intermediate frequency amplification module, described frequency mixer adopts MCA-35H+, radio-frequency head frequency range 500-3500MHz, local oscillator end frequency range 500-3500MHz, output frequency range 10-1500MHz, conversion loss≤6dB, isolation >=20dB; Described broadband band-pass filter adopts BPF-A580+, free transmission range 520-640MHz, loss≤4dB, stopband attenuation >=40dB; Described amplifier adopts GALI-74+, gain >=24dB, noise coefficient≤3, output 3 rank section >=35dB.
Fig. 4 is the second mixing and the intermediate frequency amplification module structured flowchart in the utility model embodiment. As shown in Figure 4, in this example, described the second mixing and intermediate frequency amplification module comprise the frequency mixer, first SAW filter, first amplifier, a numerical-control attenuator, second amplifier and second SAW filter that connect successively from input to output; Wherein, the signal that one input of described frequency mixer is exported for inputting the output of described the first mixing and intermediate frequency amplification module, the signal that another input of described frequency mixer is exported for inputting the output of described the second local oscillator module, the output of described second SAW filter is as the output of described the second mixing and intermediate frequency amplification module, for exporting intermediate-freuqncy signal IF. In described the second mixing and intermediate frequency amplification module, described frequency mixer adopts LAVI-711H+, radio-frequency head frequency range 220-710MHz, local oscillator end frequency range 250-740MHz, output frequency range 10-500MHz, conversion loss≤7.5dB, isolation >=40dB; Described first amplifier and second amplifier all adopt GALI-74+, the gain >=24dB of each amplifier, noise coefficient≤3, output 3 rank section >=35dB; Described first SAW filter and second SAW filter are all purchased in Beijing Chang Feng company, its centre frequency 41.5MHz, 1dB bandwidth >=500kHz, loss≤2.5dB, passband fluctuation≤0.5dB, Out-of-band rejection >=30dB; Described numerical-control attenuator adopts DAT-31R5-PP, attenuation range 31.5dB, and minimal attenuation stepping 0.1dB, control mode is 6 controls, control level is Transistor-Transistor Logic level.
Fig. 5 is the first local oscillator modular structure block diagram in the utility model embodiment. As shown in Figure 5, in this example, described the first local oscillator module comprises the RF switch, a Π type resistors match network, an amplifier and the bandpass filter that connect successively from input to output; Wherein, described RF switch is subject to the control of transmitted pulse TP, and the input of described RF switch is for inputting the 1st local oscillation signal LO1 that S-band wave observation radar frequency synthesizer produces, and the output of described bandpass filter is as the output of described the first local oscillator module. In described the first local oscillator module, described RF switch adopts SKY13286-359LF, its insertion loss≤1dB, and isolation >=58dB, the on-off switch time is less than 50ns, and control level is Transistor-Transistor Logic level, high level conducting; Described amplifier adopts GALI-84+, its gain >=18dB, noise coefficient≤4.5, output 3 rank section >=34dB; Described bandpass filter adopts the BFCN-2275+ of Mini-Circuits company, free transmission range 2170-2380MHz, loss≤3dB, stopband attenuation >=30dB; Adjusting Π type resistors match network in described the first local oscillator module, to make the power output of described the first local oscillator module be 17dBm.
Fig. 6 is the second local oscillator modular structure block diagram in the utility model embodiment. As shown in Figure 6, in this example, described the second local oscillator module comprises the RF switch, a Π type resistors match network, an amplifier and the bandpass filter that connect successively from input to output; Wherein, described RF switch is subject to the control of transmitted pulse TP, and the input of described RF switch is for inputting the 2nd local oscillation signal LO2 that S-band wave observation radar frequency synthesizer produces, and the output of described bandpass filter is as the output of described the second local oscillator module. In described the second local oscillator module, described RF switch adopts SKY13286-359LF, its insertion loss≤1dB, and isolation >=58dB, the on-off switch time is less than 50ns, and control level is Transistor-Transistor Logic level, high level conducting; Described amplifier adopts GALI-84+, its gain >=18dB, noise coefficient≤4.5, output 3 rank section >=34dB; Described bandpass filter adopts the SXBP-507+ of Mini-Circuits company, free transmission range 460-560MHz, loss≤2dB, stopband attenuation >=20dB; Adjusting Π type resistors match network in described the second local oscillator module, to make the power output of described the second local oscillator module be 17dBm.
In this example, in the time that transmitted pulse TP is low level, the switch of described RF preselection amplification module, the first local oscillator module and the second local oscillator module all ends, and the intermediate-freuqncy signal IF of described the second mixing and the output of intermediate frequency amplification module is noise.
In the time that transmitted pulse TP is low level, the equal conducting of switch of described RF preselection amplification module, the first local oscillator module and the second local oscillator module. described the first local oscillator module is by the 2.17-2.37GHz simple signal of input, namely the 1st be amplified to+17dBm of local oscillation signal LO1, described the second local oscillator module is by the 538.5MHz linear frequency modulation continuous wave signal FMCW signal of input, namely the 2nd be amplified to+17dBm of local oscillation signal LO2, the 2.75-2.95GHz linear frequency modulation of input interrupts continuous wave signal FMICW, namely radiofrequency signal RF amplifies and filtering through RF preselection amplification module, in described the first mixing and intermediate frequency amplification module and the 1st local oscillation signal LO1 mixing, amplify, filtering becomes the linear frequency modulation intermediate-freuqncy signal of 580MHz, afterwards in described the second mixing and intermediate frequency amplification module and the 2nd local oscillation signal LO2 mixing, amplify, filtering becomes the intermediate-freuqncy signal IF of 41.5MHz, process for follow-up analog-to-digital conversion and DSP.
In sum, the utility model is applicable to 2750MHz and receives to the radiofrequency signal in 2950MHz frequency range, is specially adapted to S-band wave observation radar system signal and receives. The utility model has all adopted broadband band-pass filter at RF preselection amplification module, the first mixing and intermediate frequency amplification module, has reduced the delay of signal, and the phase distortion of rf echo signal is little. The utility model has all adopted amplifier in RF preselection amplification module, the first mixing and intermediate frequency amplification module, the second mixing and intermediate frequency amplification module, has taken into account the contradiction between dynamic range and the sensitivity of AFE(analog front end). The utility model utilizes transmitted pulse TP signal to control the break-make of RF preselection amplification module, the first local oscillator module and the second local oscillator module simultaneously, has realized the high degree of isolation of receiving and transmitting signal, has expanded the dynamic range of AFE(analog front end), the sensitivity that has improved receiver. The 1st local oscillation signal LO1 of the utility model input is the simple signal of 2170MHz to 2370MHz, centered by the 2nd local oscillator LO2, frequency is the linear frequency modulation continuous wave FMCW signal that 538.5MHz, bandwidth are 30MHz, in the first mixing and intermediate frequency amplification module, realize down coversion, remove slope and realize in the second mixing and intermediate frequency amplification module, reduced the difficulty that the 1st local oscillation signal LO1 produces. The utility model receiver adopts 5V single power supply, and overall gain is 30-60dB digit control, and dynamic range is greater than 55dB, noise coefficient is less than 3dB, receiver is anti-burns maximum radio frequency input power+37dBm, and these facility have the features such as integrated level is high, performance good, and cost is low.
Specific embodiment described herein is only to the utility model explanation for example. The utility model person of ordinary skill in the field can make various amendments or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Claims (10)
1. a S-band wave observation radar rf analog front-end circuit, is characterized in that: comprise RF preselection amplification module, the first mixing and intermediate frequency amplification module, the second mixing and intermediate frequency amplification module, the first local oscillator module and the second local oscillator module;
The input of described RF preselection amplification module is for inputting the radiofrequency signal RF that S-band wave observation radar frequency synthesizer produces, and the output of described RF preselection amplification module is connected with the first input end of the first mixing and intermediate frequency amplification module; The input of described the first local oscillator module is for inputting the 1st local oscillation signal LO1 that S-band wave observation radar frequency synthesizer produces, the output of described the first local oscillator module is connected with the second input of the first mixing and intermediate frequency amplification module, and the output of described the first mixing and intermediate frequency amplification module is connected with the first input end of the second mixing and intermediate frequency amplification module; The input of described the second local oscillator module is for inputting the 2nd local oscillation signal LO2 that S-band wave observation radar frequency synthesizer produces, the output of described the second local oscillator module is connected with the second input of the second mixing and intermediate frequency amplification module, the output of described the second mixing and intermediate frequency amplification module is used for exporting intermediate-freuqncy signal IF, processes for follow-up analog-to-digital conversion and DSP;
Wherein, described RF preselection amplification module, the first local oscillator module and the second local oscillator module are subject to the control of transmitted pulse TP, in the time that transmitted pulse TP is high level, and the equal conducting of switch of described RF preselection amplification module, the first local oscillator module and the second local oscillator module; In the time that transmitted pulse TP is low level, the switch of described RF preselection amplification module, the first local oscillator module and the second local oscillator module all ends.
2. a kind of S-band wave observation radar rf analog front-end circuit according to claim 1, it is characterized in that: described RF preselection amplification module comprises the RF switch, a lightning protection device, limiter, first broadband band-pass filter, a radio frequency amplifier and second broadband band-pass filter that connect successively from input to output; Wherein, described RF switch is subject to the control of transmitted pulse TP, and the input of described RF switch is for inputting the radiofrequency signal RF that S-band wave observation radar frequency synthesizer produces, and the output of described second broadband band-pass filter is as the output of described RF preselection amplification module;
Described the first local oscillator module comprises the RF switch, a Π type resistors match network, an amplifier and the bandpass filter that connect successively from input to output; Wherein, described RF switch is subject to the control of transmitted pulse TP, and the input of described RF switch is for inputting the 1st local oscillation signal LO1 that S-band wave observation radar frequency synthesizer produces, and the output of described bandpass filter is as the output of described the first local oscillator module;
Described the second local oscillator module comprises the RF switch, a Π type resistors match network, an amplifier and the bandpass filter that connect successively from input to output; Wherein, described RF switch is subject to the control of transmitted pulse TP, and the input of described RF switch is for inputting the 2nd local oscillation signal LO2 that S-band wave observation radar frequency synthesizer produces, and the output of described bandpass filter is as the output of described the second local oscillator module;
Described the first mixing and intermediate frequency amplification module comprise the frequency mixer, a broadband band-pass filter and the amplifier that connect successively from input to output; Wherein, the signal that one input of described frequency mixer is exported for inputting the output of described RF preselection amplification module, the signal that another input of described frequency mixer is exported for inputting the output of described the first local oscillator module, the output of described amplifier is as the output of described the first mixing and intermediate frequency amplification module;
Described the second mixing and intermediate frequency amplification module comprise the frequency mixer, first SAW filter, first amplifier, a numerical-control attenuator, second amplifier and second SAW filter that connect successively from input to output; Wherein, the signal that one input of described frequency mixer is exported for inputting the output of described the first mixing and intermediate frequency amplification module, the signal that another input of described frequency mixer is exported for inputting the output of described the second local oscillator module, the output of described second SAW filter is as the output of described the second mixing and intermediate frequency amplification module, for exporting intermediate-freuqncy signal IF.
3. a kind of S-band wave observation radar rf analog front-end circuit according to claim 1 and 2, is characterized in that: three input signals of described S-band wave observation radar rf analog front-end circuit are respectively 2 local oscillation signals and 1 radiofrequency signal that S-band wave observation radar frequency synthesizer produces;
Wherein, described the 1st local oscillation signal LO1 is sine wave signal, and frequency is 2.17-2.37GHz, and power is+7dBm; Described the 2nd local oscillation signal LO2 is linear frequency modulation continuous wave signal FMCW, and frequency is 538.5MHz, and power is+7dBm; Described radiofrequency signal RF is that linear frequency modulation interrupts continuous wave signal FMICW, and frequency is 2.75-2.95GHz.
4. a kind of S-band wave observation radar rf analog front-end circuit according to claim 3, it is characterized in that: three input signals of described S-band wave observation radar rf analog front-end circuit are through described S-band wave observation radar rf analog front-end circuit, the described intermediate-freuqncy signal IF of output is an intermediate-freuqncy signal that frequency is 41.5MHz, processes for follow-up analog-to-digital conversion and DSP.
5. a kind of S-band wave observation radar rf analog front-end circuit according to claim 2, it is characterized in that: in described RF preselection amplification module, described lightning protection device adopts MC-6BP, its Lightning Protection is DC earthing, bear power 200W, insertion loss≤0.2dB, standing-wave ratio≤1.5, discharge ionization voltage is 230V;
Described limiter adopts the RLM-43-5W+ of Mini-Circuits company, be less than≤0.4dB of its Insertion Loss, clip level 10dBm ~ 37dBm, recovery time≤40ns;
Described RF switch adopts SKY13286-359LF, its insertion loss≤1dB, and isolation >=58dB, the on-off switch time is less than 50ns, and control level is Transistor-Transistor Logic level, high level conducting;
Described radio frequency amplifier adopts WHM1045LE, gain >=24dB, noise coefficient≤1.6, standing-wave ratio≤1.5;
Described first broadband band-pass filter and second broadband band-pass filter all adopt the BFCN-2850+ of Mini-Circuits company, free transmission range 2750-2950MHz, loss≤4dB, stopband attenuation >=20dB.
6. a kind of S-band wave observation radar rf analog front-end circuit according to claim 2, it is characterized in that: in described the first mixing and intermediate frequency amplification module, described frequency mixer adopts MCA-35H+, radio-frequency head frequency range 500-3500MHz, local oscillator end frequency range 500-3500MHz, output frequency range 10-1500MHz, conversion loss≤6dB, isolation >=20dB;
Described broadband band-pass filter adopts BPF-A580+, free transmission range 520-640MHz, loss≤4dB, stopband attenuation >=40dB;
Described amplifier adopts GALI-74+, gain >=24dB, noise coefficient≤3, output 3 rank section >=35dB.
7. a kind of S-band wave observation radar rf analog front-end circuit according to claim 2, it is characterized in that: in described the second mixing and intermediate frequency amplification module, described frequency mixer adopts LAVI-711H+, radio-frequency head frequency range 220-710MHz, local oscillator end frequency range 250-740MHz, output frequency range 10-500MHz, conversion loss≤7.5dB, isolation >=40dB;
Described first amplifier and second amplifier all adopt GALI-74+, the gain >=24dB of each amplifier, noise coefficient≤3, output 3 rank section >=35dB;
The centre frequency 41.5MHz of described first SAW filter and second SAW filter, 1dB bandwidth >=500kHz, loss≤2.5dB, passband fluctuation≤0.5dB, Out-of-band rejection >=30dB;
Described numerical-control attenuator adopts DAT-31R5-PP, attenuation range 31.5dB, and minimal attenuation stepping 0.1dB, control mode is 6 controls, control level is Transistor-Transistor Logic level.
8. a kind of S-band wave observation radar rf analog front-end circuit according to claim 2, it is characterized in that: in described the first local oscillator module, described RF switch adopts SKY13286-359LF, its insertion loss≤1dB, isolation >=58dB, the on-off switch time is less than 50ns, and control level is Transistor-Transistor Logic level, high level conducting;
Described amplifier adopts GALI-84+, its gain >=18dB, noise coefficient≤4.5, output 3 rank section >=34dB;
Described bandpass filter adopts the BFCN-2275+ of Mini-Circuits company, free transmission range 2170-2380MHz, loss≤3dB, stopband attenuation >=30dB; Adjusting Π type resistors match network in described the first local oscillator module, to make the power output of described the first local oscillator module be 17dBm.
9. a kind of S-band wave observation radar rf analog front-end circuit according to claim 2, it is characterized in that: in described the second local oscillator module, described RF switch adopts SKY13286-359LF, its insertion loss≤1dB, isolation >=58dB, the on-off switch time is less than 50ns, and control level is Transistor-Transistor Logic level, high level conducting;
Described amplifier adopts GALI-84+, its gain >=18dB, noise coefficient≤4.5, output 3 rank section >=34dB;
Described bandpass filter adopts the SXBP-507+ of Mini-Circuits company, free transmission range 460-560MHz, loss≤2dB, stopband attenuation >=20dB; Adjusting Π type resistors match network in described the second local oscillator module, to make the power output of described the second local oscillator module be 17dBm.
10. a kind of S-band wave observation radar rf analog front-end circuit according to claim 1, is characterized in that: in the time that transmitted pulse TP is low level, the intermediate-freuqncy signal IF of described the second mixing and the output of intermediate frequency amplification module is noise.
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| CN105572645A (en) * | 2015-12-22 | 2016-05-11 | 武汉大学 | S wave band wave observation radar radio frequency simulation front end circuit |
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| CN105572645A (en) * | 2015-12-22 | 2016-05-11 | 武汉大学 | S wave band wave observation radar radio frequency simulation front end circuit |
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