CN102829878A - Direct-current bias amplifying circuit based microwave radiometer channel voltage control method - Google Patents
Direct-current bias amplifying circuit based microwave radiometer channel voltage control method Download PDFInfo
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Abstract
The invention relates to a direct-current bias amplifying circuit based microwave radiometer channel voltage control method. A microwave radiometer detector outputs channel observation signals to a direct-current bias amplifying module, simultaneously receives direct-current bias voltage generated by a bias voltage generation module and forms an adder circuit, the input channel observation signal reduces the direct-current bias voltage, the subtracted result is amplified and output to an AD (analog to digital) conversion module which converts analog voltage signals into digital signals and outputs to a control parameter generation module, and the control parameter generation module acquires voltage control parameters needed by calculation and outputs to the direct-current bias amplifying module. By the direct--current bias amplifying circuit based microwave radiometer channel voltage control method, performance requirements on bias voltage devices are lowered, and influences of an automatic voltage circuit on performances of a microwave radiometer are reduced.
Description
Technical field
The present invention relates to a kind of direct current biasing amplifying circuit and reach microwave radiometer passage automatic voltage control method, belong to the microwave remote sensing field based on the direct current biasing amplifying circuit.
Background technology
Automatism voltage control is the requisite link of microwave radiation meter systems.Automatism voltage control mainly solves because the voltage that is input to the AD transducer that the change in gain of reception amplification link causes exceeds the problem of AD transducer range.The microwave radiation meter systems generally comprises antenna, receiver, wave detector, the video amplifier and AD transducer; After being received by antenna, microwave signal in receiver, accomplishes the amplification of radio frequency and intermediate frequency; Amplifying signal amplifies and the AD conversion through carrying out video after the detection, obtains digital signal.The microwave radiometer observed object is generally the noise that bright temperature is 3-350K; Be superimposed upon on the noise of the hundreds of K of common receiver own, before wave detector, obtain Power Conversion usually about 2dB, the signal after the detection is very faint; And comprise a large amount of useless dc information; For obtaining enough voltage resolutions, need surpass these signals and carry out the AD conversion after several thousand times video amplifies, the gain fluctuation that therefore produces any when radio frequency or intermediate-frequency circuit all can produce than great fluctuation process at video circuit; The voltage range that causes video circuit to be exported exceeds the range of AD transducer, causes the systemic-function forfeiture.
For fear of because the influence that the gain fluctuation on radio frequency or road causes; Common design is to increase one-level automatic gain control circuit (AGC) at radio frequency or intermediate frequency; Data after the AD conversion are calculated the controlled variable that acquisition needs; Controlled variable is transformed into aanalogvoltage through the DA transducer, and the control end that is sent to AGC is realized automatic gain control.
Common microwave radiometer theory diagram is as shown in Figure 1, the deficiency of radio frequency or intermediate frequency AGC control be need radio frequency or in frequency link increase one-level agc circuit, and having relatively high expectations to control accuracy.
Through being amplified by video amplifier circuit after the detection, enlargement factor is more than several thousand times, therefore because the fluctuation that AGC control voltage fluctuation causes directly is exaggerated thousands of times usually through the signal after the AGC control; The fluctuation that generation can't be eliminated; The measuring accuracy of reduction system, the voltage of control agc circuit is produced by the DA transducer, and is therefore higher to the performance requirement of DA transducer; The EMC Design of circuit is had relatively high expectations, and increases design difficulty.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art; Provide a kind of dc amplification circuit to reach microwave radiometer channel voltage autocontrol method based on the direct current biasing amplifying circuit; Through direct current biasing amplifying circuit real-Time Compensation microwave radiometer since the receiver gain that factors such as working temperature fluctuation and device aging cause fluctuate; Make the DC voltage of exporting after the receiver detection be unlikely to exceed the input dynamic range of AD transducer; And can effectively reduce producing the performance requirement of bias voltage device, reduce the direct current biasing amplifying circuit simultaneously to the Effect on Performance of microwave radiometer own.
The object of the invention mainly is to be achieved through following technical scheme:
A kind of direct current biasing amplifying circuit comprises direct current biasing amplification module, AD conversion module, controlled variable generation module and bias voltage generation module, wherein:
Direct current biasing amplification module: the passage observation signal that receives the output of external microwave radiometer wave detector; Receive the dc offset voltage that the bias voltage generation module produces; Form an adder circuit; The passage observation signal of input is deducted the dc offset voltage that the dc offset voltage module produces, subtract each other and export to the AD conversion module after the result amplifies according to the enlargement factor of design;
AD changes module: receive the voltage signal of direct current biasing amplification module output, convert analog voltage signal into digital signal, and output to the controlled variable generation module;
The controlled variable generation module: the initial moment of external microwave radiometer start, send to the bias voltage generation module with being preset at inner preset parameter, produce bias voltage and send to the direct current biasing amplification module; After the external microwave radiometer start work, receive AD conversion module output digital signal, obtain the required voltage controlled variable, the Control of Voltage parameter is outputed to the bias voltage generation module through calculating;
Bias voltage generation module: receive the Control of Voltage parameter that the controlled variable generation module sends; The Control of Voltage parameter is carried out obtaining after the digital-to-analog conversion aanalogvoltage smaller or equal to+5V; With inside produce+5V voltage compares; Be that said aanalogvoltage smaller or equal to+5V deducts said inner the generation+5V voltage, obtain one, export to the direct current biasing amplification module smaller or equal to 0 bias voltage.
In above-mentioned direct current biasing amplifying circuit; The bias voltage generation module comprises DA conversion module, comparator module and high steady voltage generating module; Wherein the DA conversion module receives the Control of Voltage parameter of controlled variable generation module output; The Control of Voltage parameter is carried out obtaining after the digital-to-analog conversion aanalogvoltage smaller or equal to+5V, output to the anode of comparator module; High steady voltage generating module produces surely high+5V voltage, outputs to the comparator module negative terminal; Comparator module will compare from aanalogvoltage and high steady+5V voltage that receives from the steady voltage generating module of height smaller or equal to+5V that the DA conversion module receives; Be that said aanalogvoltage smaller or equal to+5V deducts said inner the generation+5V voltage; Obtain one smaller or equal to 0 bias voltage, export to the direct current biasing amplification module.
In above-mentioned direct current biasing amplifying circuit, the controlled variable generation module externally after the microwave radiometer start work, obtains the required voltage controlled variable through following method:
(1) when the inner hot reference source of microwave radiometer observation, whether the output voltage that the controlled variable generation module is judged AD conversion module N as a result is maximal value MAX, if maximal value; Then setting initial adjustment amount is M, and 0＜M＜MAX wherein is according to the adjustment amount step value L that sets; Wherein 0＜L＜MAX can calculate adjustment amount D=M/L, after deducting said adjustment amount D on the basis of existing controlled variable, is converted into the output of 16 system numbers; If subtract each other the result, then use 0x00H less than 0x00H;
(2) when microwave radiometer is observed the hot reference source of inside; The output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether greater than desired value T and less than maximal value MAX, if, according to the adjustment amount step value L that sets; Can calculate adjustment amount D=(N-T)/L; After deducting said adjustment amount D on the existing controlled variable basis, be converted into sexadecimal number output,, then use 0x00H if subtract each other the result less than 0x00H; 0＜T＜MAX wherein, 0＜L＜MAX;
(3) when the inner hot reference source of microwave radiometer observation, whether the output voltage that the controlled variable generation module is judged AD conversion module N as a result is minimum value MIN, if minimum value; Then setting initial adjustment amount is M, and 0＜M＜MAX wherein is according to the adjustment amount step value L that sets; Wherein 0＜L＜MAX can calculate adjustment amount D=M/L, after adding the above adjustment amount D on the basis of existing controlled variable, is converted into the output of 16 system numbers; If addition result greater than 0xFFH, is then used 0xFFH;
(4) when microwave radiometer is observed the hot reference source of inside; The output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether less than desired value T and greater than minimum value MIN, if, according to the adjustment amount step value L that sets; Can calculate adjustment amount D=(N-T)/L; Export after after adding the above adjustment amount D on the existing controlled variable basis, being converted into sexadecimal number, if addition result greater than 0xFFH, is then used 0xFFH; 0＜T＜MAX wherein, 0＜L＜MAX;
(5) when the inner hot reference source of microwave radiometer observation, the output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether between T ± LmV, if; Then do not adjust, wherein T is a desired value, and 0＜T＜MAX; L is the adjustment amount step value, and 0＜L＜MAX.
A kind of microwave radiometer that comprises above-mentioned direct current biasing amplifying circuit also comprises the wave detector, intermediate frequency amplifier, low-pass filter, frequency mixer, BPF. and the low noise amplifier that are connected successively with said direct current biasing amplifying circuit.
A kind of microwave radiometer that comprises above-mentioned direct current biasing amplifying circuit also comprises the wave detector, radio frequency amplifier, BPF. and the low noise amplifier that are connected successively with said direct current biasing amplifying circuit.
Microwave radiometer channel voltage control method based on above-mentioned direct current biasing amplifying circuit comprises the steps:
(1) microwave radiometer is started shooting the initial moment, and the controlled variable generation module will be preset at inner preset parameter and send to the bias voltage generation module, produces bias voltage and sends to the direct current biasing amplification module;
(2) after the microwave radiometer start work; When microwave radiometer observes inner hot reference source; Microwave radiometer wave detector output channel observation signal is to the direct current biasing amplification module, and the direct current biasing amplification module receives the dc offset voltage that the bias voltage generation module produces simultaneously, forms an adder circuit; The passage observation signal of input is deducted dc offset voltage, subtract each other and export to the AD conversion module after the result amplifies according to the enlargement factor of design;
(3) AD changes the voltage signal that module receives the output of direct current biasing amplification module, converts analog voltage signal into digital signal, and exports the controlled variable generation module to;
(4) the controlled variable generation module receives AD conversion module output digital signal, obtains the required voltage controlled variable through calculating, and exports the Control of Voltage parameter to the bias voltage generation module;
(5) the bias voltage generation module receives the Control of Voltage parameter that the controlled variable generation module sends; The Control of Voltage parameter is carried out obtaining after the digital-to-analog conversion aanalogvoltage smaller or equal to+5V; With inside produce+5V voltage compares, promptly said aanalogvoltage smaller or equal to+5V deduct said inner produce+5V voltage, obtain one smaller or equal to 0 bias voltage; Export the direct current biasing amplification module to, get back to step (2).
In above-mentioned microwave radiometer channel voltage control method based on the direct current biasing amplifying circuit, the detailed process of controlled variable generation module acquisition required voltage controlled variable is following in the step (4):
(1) when the inner hot reference source of microwave radiometer observation, whether the output voltage that the controlled variable generation module is judged AD conversion module N as a result is maximal value MAX, if maximal value; Then setting initial adjustment amount is M, and 0＜M＜MAX wherein is according to the adjustment amount step value L that sets; Wherein 0＜L＜MAX can calculate adjustment amount D=M/L, after deducting said adjustment amount D on the basis of existing controlled variable, is converted into the output of 16 system numbers; If subtract each other the result, then use 0x00H less than 0x00H;
(2) when microwave radiometer is observed the hot reference source of inside; The output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether greater than desired value T and less than maximal value MAX, if, according to the adjustment amount step value L that sets; Can calculate adjustment amount D=(N-T)/L; After deducting said adjustment amount D on the existing controlled variable basis, be converted into sexadecimal number output,, then use 0x00H if subtract each other the result less than 0x00H; 0＜T＜MAX wherein, 0＜L＜MAX;
(3) when the inner hot reference source of microwave radiometer observation, whether the output voltage that the controlled variable generation module is judged AD conversion module N as a result is minimum value MIN, if minimum value; Then setting initial adjustment amount is M, and 0＜M＜MAX wherein is according to the adjustment amount step value L that sets; Wherein 0＜L＜MAX can calculate adjustment amount D=M/L, after adding the above adjustment amount D on the basis of existing controlled variable, is converted into the output of 16 system numbers; If addition result greater than 0xFFH, is then used 0xFFH;
(4) when microwave radiometer is observed the hot reference source of inside; The output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether less than desired value T and greater than minimum value MIN, if, according to the adjustment amount step value L that sets; Can calculate adjustment amount D=(N-T)/L; Export after after adding the above adjustment amount D on the existing controlled variable basis, being converted into sexadecimal number, if addition result greater than 0xFFH, is then used 0xFFH; 0＜T＜MAX wherein, 0＜L＜MAX;
(5) when the inner hot reference source of microwave radiometer observation, the output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether between T ± LmV, if; Then do not adjust, wherein T is a desired value, and 0＜T＜MAX; L is the adjustment amount step value, and 0＜L＜MAX.
The present invention compared with prior art has following advantage:
(1) the present invention is based on the microwave radiometer channel voltage autocontrol method of direct current biasing amplifying circuit; Through direct current biasing amplifying circuit real-Time Compensation microwave radiometer since the receiver gain that factors such as working temperature fluctuation and device aging cause fluctuate; Make the DC voltage of exporting after the receiver detection be unlikely to exceed the input dynamic range of AD transducer; And can effectively reduce producing the performance requirement of bias voltage device, reduce the direct current biasing amplifying circuit simultaneously to the Effect on Performance of microwave radiometer own;
(2) the present invention realize control method the direct current biasing amplifying circuit after microwave radiometer radio frequency or intermediate frequency wave detector; Avoided increasing one-level automatic gain (AGC) control circuit at radio frequency or intermediate frequency; And the direct current biasing amplifying circuit is made up of direct current biasing amplification module, AD conversion module, controlled variable generation module and bias voltage generation module; Simple in structure, reduced the design difficulty of radio frequency or intermediate-frequency circuit, on engineering, be easy to realize;
(3) the present invention is based in the microwave radiometer channel voltage autocontrol method of direct current biasing amplifying circuit; Because dc bias circuit is positioned at the gain rear end of whole reception link; Therefore bias amplifier output is less to the observed result influence, has reduced the performance requirement to devices such as DA;
(4) the microwave radiometer passage automatic voltage control method that the present invention is based on the direct current biasing amplifying circuit is applicable to all types of microwave radiometer passage automatic gains controls, has wider range of application and stronger practicality.
Description of drawings
Fig. 1 is for adopting the microwave radiometer receiving cable block diagram of intermediate frequency automatic gain control;
Fig. 2 is a direct current biasing amplification circuit structure synoptic diagram of the present invention;
Fig. 3 is bias voltage generation module structural representation in the direct current biasing amplifying circuit of the present invention;
Fig. 4 is the microwave radiometer structural representation Fig. 1 that the present invention includes the direct current biasing amplifying circuit;
Fig. 5 is the microwave radiometer structural representation Fig. 2 that the present invention includes the direct current biasing amplifying circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is made further detailed description:
Like Fig. 2 is direct current biasing amplification circuit structure synoptic diagram of the present invention, and the direct current biasing amplifying circuit comprises direct current biasing amplification module, bias voltage generation module, AD conversion module and controlled variable generation module.Its annexation is: direct current biasing amplification module input negative terminal is connected outside microwave radiometer radio frequency wave detector output terminal; Bias voltage generation module output terminal is connected the input negative terminal of direct current biasing amplification module; Form an adder circuit; The input end of the output termination AD conversion module of direct current biasing amplification module; The digital output end of AD conversion module connects the digital input end of controlled variable generation module, and the digital output end of controlled variable generation module is connected the input end of bias voltage generation module.
The direct current biasing amplification module receives the passage observation signal of external microwave radiometer wave detector output; Receive the dc offset voltage that the bias voltage generation module produces; Form an adder circuit; The passage observation signal of input is deducted the dc offset voltage that the dc offset voltage module produces, subtract each other and export to the AD conversion module after the result amplifies according to the enlargement factor of design.The direct current biasing amplifying circuit adopts high precision operating amplifier to realize that amplifier is connected to the negative feedback totalizer, and the input of totalizer is respectively the passage observation signal of outside wave detector output and receives the dc offset voltage that the bias voltage generation module produces.
The module that changes AD adopts 16bit accuracy A D transducer, receives the voltage signal of direct current biasing amplification module output, and signal is carried out the AD conversion, converts analog voltage signal into digital signal, and outputs to the controlled variable generation module.
The controlled variable generation module is the initial moment of microwave radiometer start externally, sends to the bias voltage generation module with being preset at inner preset parameter, produces bias voltage and sends to the direct current biasing amplification module.After the external microwave radiometer start work, receive AD conversion module output digital signal, obtain the required voltage controlled variable, the Control of Voltage parameter is outputed to the bias voltage generation module through calculating.The controlled variable generation module adopts the microprocessor of C51 series to realize; Realize the Data Receiving of 16bit through peripheral circuit; The Control of Voltage parameter obtains through calculating, and the Control of Voltage parameter of design is the 8bit sexadecimal number, and the voltage adjustment amount of each layering representative is 200mV.
Be illustrated in figure 3 as bias voltage generation module structural representation in the direct current biasing amplifying circuit of the present invention, can know that by figure the bias voltage generation module comprises DA conversion module, comparator module and high steady voltage generating module.Its annexation is: the output of DA transducer is connected the input anode of comparator module, and high steady voltage source output connects the input negative terminal of comparator module, exports through after the comparator module.
Wherein the DA conversion module receives the Control of Voltage parameter of controlled variable generation module output, and the Control of Voltage parameter is carried out obtaining after the digital-to-analog conversion aanalogvoltage smaller or equal to+5V, outputs to the anode of comparator module.The DA converter module is selected 8bit precision DA transducer, transducer output voltage range 0-5V for use.
High steady voltage generating module produces surely high+5V voltage, outputs to the comparator module negative terminal.High steady voltage source module is selected the high-accuracy voltage source module for use, and output voltage is+5V that voltage fluctuation is not more than 100ppm.
Comparator module will from the DA conversion module receive≤+ aanalogvoltage and the high steady+5V voltage that receives from the steady voltage generating module of height of 5V compares; Promptly≤+ aanalogvoltage of 5V deducts inner high steady+5V voltage that produces; Obtain one smaller or equal to 0 bias voltage, export to the direct current biasing amplification module.Comparator module is selected high precision operating amplifier for use; Amplifier is set to comparison; The output of DA conversion module is connected the input anode of comparator module, and the output of high steady voltage generating module connects the input negative terminal of comparator module, and the output signal is the DC voltage smaller or equal to 0.
The present invention is based on the microwave radiometer channel voltage autocontrol method of direct current biasing amplifying circuit, specifically comprise the steps:
(1) microwave radiometer is started shooting the initial moment, and the controlled variable generation module will be preset at inner preset parameter and send to the bias voltage generation module, produces bias voltage and sends to the direct current biasing amplification module;
(2) after the microwave radiometer start work; When microwave radiometer observes inner hot reference source; Microwave radiometer wave detector output channel observation signal is to the direct current biasing amplification module, and the direct current biasing amplification module receives the dc offset voltage that the bias voltage generation module produces simultaneously, forms an adder circuit; The passage observation signal of input is deducted dc offset voltage, subtract each other and export to the AD conversion module after the result amplifies according to the enlargement factor of design.
(3) AD changes the voltage signal that module receives the output of direct current biasing amplification module, converts analog voltage signal into digital signal, and exports the controlled variable generation module to.
(4) the controlled variable generation module receives AD conversion module output digital signal, obtains the required voltage controlled variable through calculating, and exports the Control of Voltage parameter to the bias voltage generation module, and the Control of Voltage parameter is the 8bit sexadecimal number.
(5) the bias voltage generation module receives the Control of Voltage parameter that the controlled variable generation module sends; The Control of Voltage parameter is carried out obtaining after the digital-to-analog conversion aanalogvoltage smaller or equal to+5V; With inside produce+5V voltage compares, promptly said aanalogvoltage smaller or equal to+5V deduct said inner produce+5V voltage, obtain one smaller or equal to 0 bias voltage; Export the direct current biasing amplification module to, get back to step (2).
Under the microwave radiometer normal mode of operation, the hot reference source that each scanning Zhou Douhui observation is once inner all can carry out the operation of step (2) to step (5) at every turn, forms the real-time cycle to control automatically.
The controlled variable generation module is following through calculating the detailed process that obtains the required voltage controlled variable in the above-mentioned steps (4):
Step (one), when the inner hot reference source of microwave radiometer observation; Whether the output voltage that the controlled variable generation module is judged AD conversion module N as a result is maximal value 10V, if maximal value, then setting initial adjustment amount is 6V; Adjustment amount stepping according to each layering 200mV; Can calculate adjustment amount D=6/0.2=30, being converted into sexadecimal number is 0x1EH, after deducting said adjustment amount on the basis of existing controlled variable, is converted into the output of 16 system numbers; If subtract each other the result, then use 0x00H less than 0x00H;
Step (two), when the inner hot reference source of microwave radiometer observation; The output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether greater than desired value 3V and less than maximal value 10V, if, according to the adjustment amount stepping of each layering 200mV; Can calculate adjustment amount D=(N-3)/0.2; After deducting said adjustment amount on the existing controlled variable basis, be converted into sexadecimal number output,, then use 0x00H if subtract each other the result less than 0x00H;
Step (three), when the inner hot reference source of microwave radiometer observation; Whether the output voltage that the controlled variable generation module is judged AD conversion module N as a result is minimum value 0V, if minimum value, then setting initial adjustment amount is 9V; Adjustment amount stepping according to each layering 200mV; Can calculate adjustment amount D=9/0.2=45, being converted into sexadecimal number is 0x2DH, after adding the above adjustment amount on the basis of existing controlled variable, is converted into sexadecimal number output; If addition result greater than 0xFFH, is then used 0xFFH;
Step (four), when the inner hot reference source of microwave radiometer observation; The output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether less than desired value 3V and greater than minimum value 0V, if, according to the adjustment amount stepping of each layering 200mV; Can calculate adjustment amount D=(N-3)/0.2; Export after after adding the above adjustment amount on the existing controlled variable basis, being converted into sexadecimal number, if addition result greater than 0xFFH, is then used 0xFFH;
Step (five), when the inner hot reference source of microwave radiometer observation, the output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether between 3 ± 0.2mV, if then do not adjust.
Be illustrated in figure 4 as the microwave radiometer structural representation Fig. 1 that the present invention includes the direct current biasing amplifying circuit, first of microwave radiometer kind of structure is to be connected to form successively by direct current biasing amplifying circuit, wave detector, intermediate frequency amplifier, low-pass filter, frequency mixer, BPF., low noise amplifier and antenna among the present invention.Be illustrated in figure 5 as the microwave radiometer structural representation Fig. 2 that the present invention includes the direct current biasing amplifying circuit; Second of microwave radiometer kind of structure is to be connected to form successively by direct current biasing amplifying circuit, wave detector, radio frequency amplifier, BPF., low noise amplifier and antenna among the present invention; Compare with the microwave radiometer that employing intermediate frequency automatic gain shown in Figure 1 is controlled; Microwave radiometer structure of the present invention has been saved at radio frequency or intermediate frequency increases automatic gain control circuit (AGC), because dc bias circuit is positioned at the gain rear end of whole reception link, so bias amplifier output is less to the observed result influence; Reduced performance requirement to devices such as DA; And simple in structure, reduced the design difficulty of radio frequency or intermediate-frequency circuit, on engineering, be easy to realize.
The above; Be merely the best embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
The content of not doing to describe in detail in the instructions of the present invention belongs to this area professional and technical personnel's known technology.
Claims (7)
1. direct current biasing amplifying circuit is characterized in that: comprise direct current biasing amplification module, AD conversion module, controlled variable generation module and bias voltage generation module, wherein:
Direct current biasing amplification module: the passage observation signal that receives the output of external microwave radiometer wave detector; Receive the dc offset voltage that the bias voltage generation module produces; Form an adder circuit; The passage observation signal of input is deducted the dc offset voltage that the dc offset voltage module produces, subtract each other and export to the AD conversion module after the result amplifies according to the enlargement factor of design;
AD changes module: receive the voltage signal of direct current biasing amplification module output, convert analog voltage signal into digital signal, and output to the controlled variable generation module;
The controlled variable generation module: the initial moment of external microwave radiometer start, send to the bias voltage generation module with being preset at inner preset parameter, produce bias voltage and send to the direct current biasing amplification module; After the external microwave radiometer start work, receive AD conversion module output digital signal, obtain the required voltage controlled variable, the Control of Voltage parameter is outputed to the bias voltage generation module through calculating;
Bias voltage generation module: receive the Control of Voltage parameter that the controlled variable generation module sends; The Control of Voltage parameter is carried out obtaining after the digital-to-analog conversion aanalogvoltage smaller or equal to+5V; With inside produce+5V voltage compares; Be that said aanalogvoltage smaller or equal to+5V deducts said inner the generation+5V voltage, obtain one, export to the direct current biasing amplification module smaller or equal to 0 bias voltage.
2. a kind of direct current biasing amplifying circuit according to claim 1; It is characterized in that: said bias voltage generation module comprises DA conversion module, comparator module and high steady voltage generating module; Wherein the DA conversion module receives the Control of Voltage parameter of controlled variable generation module output; The Control of Voltage parameter is carried out obtaining after the digital-to-analog conversion aanalogvoltage smaller or equal to+5V, output to the anode of comparator module; High steady voltage generating module produces surely high+5V voltage, outputs to the comparator module negative terminal; Comparator module will compare from aanalogvoltage and high steady+5V voltage that receives from the steady voltage generating module of height smaller or equal to+5V that the DA conversion module receives; Be that said aanalogvoltage smaller or equal to+5V deducts said inner the generation+5V voltage; Obtain one smaller or equal to 0 bias voltage, export to the direct current biasing amplification module.
3. a kind of direct current biasing amplifying circuit according to claim 1 is characterized in that: said controlled variable generation module externally after the microwave radiometer start work, obtains the required voltage controlled variable through following method:
(1) when the inner hot reference source of microwave radiometer observation, whether the output voltage that the controlled variable generation module is judged AD conversion module N as a result is maximal value MAX, if maximal value; Then setting initial adjustment amount is M, and 0＜M＜MAX wherein is according to the adjustment amount step value L that sets; Wherein 0＜L＜MAX can calculate adjustment amount D=M/L, after deducting said adjustment amount D on the basis of existing controlled variable, is converted into the output of 16 system numbers; If subtract each other the result, then use 0x00H less than 0x00H;
(2) when microwave radiometer is observed the hot reference source of inside; The output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether greater than desired value T and less than maximal value MAX, if, according to the adjustment amount step value L that sets; Can calculate adjustment amount D=(N-T)/L; After deducting said adjustment amount D on the existing controlled variable basis, be converted into sexadecimal number output,, then use 0x00H if subtract each other the result less than 0x00H; 0＜T＜MAX wherein, 0＜L＜MAX;
(3) when the inner hot reference source of microwave radiometer observation, whether the output voltage that the controlled variable generation module is judged AD conversion module N as a result is minimum value MIN, if minimum value; Then setting initial adjustment amount is M, and 0＜M＜MAX wherein is according to the adjustment amount step value L that sets; Wherein 0＜L＜MAX can calculate adjustment amount D=M/L, after adding the above adjustment amount D on the basis of existing controlled variable, is converted into the output of 16 system numbers; If addition result greater than 0xFFH, is then used 0xFFH;
(4) when microwave radiometer is observed the hot reference source of inside; The output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether less than desired value T and greater than minimum value MIN, if, according to the adjustment amount step value L that sets; Can calculate adjustment amount D=(N-T)/L; Export after after adding the above adjustment amount D on the existing controlled variable basis, being converted into sexadecimal number, if addition result greater than 0xFFH, is then used 0xFFH; 0＜T＜MAX wherein, 0＜L＜MAX;
(5) when the inner hot reference source of microwave radiometer observation, the output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether between T ± LmV, if; Then do not adjust, wherein T is a desired value, and 0＜T＜MAX; L is the adjustment amount step value, and 0＜L＜MAX.
4. a microwave radiometer that comprises the described direct current biasing amplifying circuit of claim 1 is characterized in that: also comprise the wave detector, intermediate frequency amplifier, low-pass filter, frequency mixer, BPF. and the low noise amplifier that are connected successively with said direct current biasing amplifying circuit.
5. a microwave radiometer that comprises the described direct current biasing amplifying circuit of claim 1 is characterized in that: also comprise the wave detector, radio frequency amplifier, BPF. and the low noise amplifier that are connected successively with said direct current biasing amplifying circuit.
6. based on the microwave radiometer channel voltage control method of the said direct current biasing amplifying circuit of claim 1, it is characterized in that comprising the steps:
(1) microwave radiometer is started shooting the initial moment, and the controlled variable generation module will be preset at inner preset parameter and send to the bias voltage generation module, produces bias voltage and sends to the direct current biasing amplification module;
(2) after the microwave radiometer start work; When microwave radiometer observes inner hot reference source; Microwave radiometer wave detector output channel observation signal is to the direct current biasing amplification module, and the direct current biasing amplification module receives the dc offset voltage that the bias voltage generation module produces simultaneously, forms an adder circuit; The passage observation signal of input is deducted dc offset voltage, subtract each other and export to the AD conversion module after the result amplifies according to the enlargement factor of design;
(3) AD changes the voltage signal that module receives the output of direct current biasing amplification module, converts analog voltage signal into digital signal, and exports the controlled variable generation module to;
(4) the controlled variable generation module receives AD conversion module output digital signal, obtains the required voltage controlled variable through calculating, and exports the Control of Voltage parameter to the bias voltage generation module;
(5) the bias voltage generation module receives the Control of Voltage parameter that the controlled variable generation module sends; The Control of Voltage parameter is carried out obtaining after the digital-to-analog conversion aanalogvoltage smaller or equal to+5V; With inside produce+5V voltage compares, promptly said aanalogvoltage smaller or equal to+5V deduct said inner produce+5V voltage, obtain one smaller or equal to 0 bias voltage; Export the direct current biasing amplification module to, get back to step (2).
7. the microwave radiometer channel voltage control method based on the direct current biasing amplifying circuit according to claim 6 is characterized in that: the detailed process of controlled variable generation module acquisition required voltage controlled variable is following in the said step (4):
(1) when the inner hot reference source of microwave radiometer observation, whether the output voltage that the controlled variable generation module is judged AD conversion module N as a result is maximal value MAX, if maximal value; Then setting initial adjustment amount is M, and 0＜M＜MAX wherein is according to the adjustment amount step value L that sets; Wherein 0＜L＜MAX can calculate adjustment amount D=M/L, after deducting said adjustment amount D on the basis of existing controlled variable, is converted into the output of 16 system numbers; If subtract each other the result, then use 0x00H less than 0x00H;
(2) when microwave radiometer is observed the hot reference source of inside; The output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether greater than desired value T and less than maximal value MAX, if, according to the adjustment amount step value L that sets; Can calculate adjustment amount D=(N-T)/L; After deducting said adjustment amount D on the existing controlled variable basis, be converted into sexadecimal number output,, then use 0x00H if subtract each other the result less than 0x00H; 0＜T＜MAX wherein, 0＜L＜MAX;
(3) when the inner hot reference source of microwave radiometer observation, whether the output voltage that the controlled variable generation module is judged AD conversion module N as a result is minimum value MIN, if minimum value; Then setting initial adjustment amount is M, and 0＜M＜MAX wherein is according to the adjustment amount step value L that sets; Wherein 0＜L＜MAX can calculate adjustment amount D=M/L, after adding the above adjustment amount D on the basis of existing controlled variable, is converted into the output of 16 system numbers; If addition result greater than 0xFFH, is then used 0xFFH;
(4) when microwave radiometer is observed the hot reference source of inside; The output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether less than desired value T and greater than minimum value MIN, if, according to the adjustment amount step value L that sets; Can calculate adjustment amount D=(N-T)/L; Export after after adding the above adjustment amount D on the existing controlled variable basis, being converted into sexadecimal number, if addition result greater than 0xFFH, is then used 0xFFH; 0＜T＜MAX wherein, 0＜L＜MAX;
(5) when the inner hot reference source of microwave radiometer observation, the output voltage that the controlled variable generation module is judged the AD conversion module as a result N whether between T ± LmV, if; Then do not adjust, wherein T is a desired value, and 0＜T＜MAX; L is the adjustment amount step value, and 0＜L＜MAX.
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| CN103217661A (en) * | 2013-03-29 | 2013-07-24 | 西安空间无线电技术研究所 | Microwave radiometer wave detector and wave detection method thereof based on integrated multiplier |
| CN105610762A (en) * | 2015-12-17 | 2016-05-25 | 中国电子科技集团公司第四十一研究所 | Adjustable wide carrier orthogonal modulation device |
| CN112858874A (en) * | 2020-12-31 | 2021-05-28 | 杭州长川科技股份有限公司 | Transconductance parameter measuring circuit and method |
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| US20040017861A1 (en) * | 2002-07-25 | 2004-01-29 | Mitsubishi Denki Kabushiki Kaisha | Slice circuit capable of accurate conversion of an analog signal to a digital signal |
| CN102522960A (en) * | 2011-12-23 | 2012-06-27 | 中国电子科技集团公司第四十一研究所 | Hardware-controlled automatic intermediate-frequency gain control method for vector network analyzer |
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| US20040017861A1 (en) * | 2002-07-25 | 2004-01-29 | Mitsubishi Denki Kabushiki Kaisha | Slice circuit capable of accurate conversion of an analog signal to a digital signal |
| CN102522960A (en) * | 2011-12-23 | 2012-06-27 | 中国电子科技集团公司第四十一研究所 | Hardware-controlled automatic intermediate-frequency gain control method for vector network analyzer |
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| CN103217661A (en) * | 2013-03-29 | 2013-07-24 | 西安空间无线电技术研究所 | Microwave radiometer wave detector and wave detection method thereof based on integrated multiplier |
| CN105610762A (en) * | 2015-12-17 | 2016-05-25 | 中国电子科技集团公司第四十一研究所 | Adjustable wide carrier orthogonal modulation device |
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