CN103698044A - Temperature measurement error analysis method based on satellite temperature remote measuring - Google Patents

Temperature measurement error analysis method based on satellite temperature remote measuring Download PDF

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CN103698044A
CN103698044A CN201310658847.4A CN201310658847A CN103698044A CN 103698044 A CN103698044 A CN 103698044A CN 201310658847 A CN201310658847 A CN 201310658847A CN 103698044 A CN103698044 A CN 103698044A
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temperature
error
satellite
thermistor
reference voltage
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CN103698044B (en
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司圣平
朱维
刘伟
吴东
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Shanghai Institute of Satellite Engineering
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Shanghai Institute of Satellite Engineering
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Abstract

The invention discloses a temperature measurement error analysis method based on satellite temperature remote measuring. The method comprises the following steps: step 1, the best fit equation of a thermistor is determined; step 2: a reference voltage is obtained through satellite downlink remote measuring, and whether the reference voltage conforms to the designed voltage of a circuit is judged, wherein if yes, reference voltage cannot cause errors, and if no, temperature measurement errors caused by deviation of the reference voltage can be determined; step 3, before being mounted, a temperature measuring resistor is required to be calibrated, so as to obtain the resistance value of the temperature measuring resistor, and a comparison is performed between the resistance value and a designed value; if the resistance value is in accord with the designed value, errors cannot be produced; if the resistance value is not in accord with the designed value, temperature measurement errors caused by the deviation of the temperature measuring resistor can be computed; step 4, a quantization error range caused by an AD converter can be computed; step 5, principia mathematica errors caused by a satellite temperature measuring system can be comprehensively computed and estimated. According to the invention, errors caused during the measurement process can be accurately analyzed, calculation compensation can be performed on temperature measurement each time, and high accuracy temperature measurement can be achieved.

Description

Temperature measurement error analytical approach based on satellite temperature remote measurement
Technical field
The present invention relates to a kind of temperature measurement error analytical approach, particularly relate to a kind of temperature measurement error analytical approach based on satellite temperature remote measurement.
Background technology
At present, satellite test and satellite be in-orbit time, and satellite test personnel and long tube personnel via satellite descending remote temperature sensing monitor and judge that whether the duty of satellite is normal.The resistance of thermistor changes along with the variation of ambient temperature, and based on this principle, satellite temperature acquisition method is by circuit, the thermistor resistance under different temperatures environment to be converted to the voltage signal of different sizes.Voltage signal, by processing on star after (modulation and transmitting on AD conversion, star), by passing to " ground " under aerial radiation radiofrequency signal, then is completed after reception by receiving antenna, is sent to ground receiving system and completes parsing, isolates remote temperature sensing.Complete satellite temperature measuring system as shown in Figure 1.R in Fig. 1 pbe called build-out resistor, it and thermistor R rseries connection, reference voltage V and build-out resistor, thermistor are for electric forming current loop, and the voltage at thermistor two ends is V r, V ras the input signal of AD transducer, AD transducer quantizes output PCM signal V l, after modulate emission on star, be sent to " ground ", by ground receiving demodulation device, parse remote temperature sensing signal V t.
In order to obtain the measured value T ' of temperature on star now, need to complete following three steps:
Step 1) is according to telesignalisation V tthe voltage that calculates thermistor two ends, use formula (1) is tried to achieve the resistance of thermistor;
R ′ = R p V / V T - 1 Formula (1)
Step 2) according to thermistor R rcalibration table, carry out curve fitting, obtain fit equation T=f (R r);
Step 3) is by R ' substitution equation T=f (R r), obtain measuring temperature T '=f(R '), measurement temperature when T ' is T ℃ for satellite environment temperature.
In sum, temperature survey on mathematical principle by the error aspect below producing four: one, satellite utilizes the reference voltage that three terminal regulator provides to have certain precision, there is certain error with design load, while is along with three terminal regulator is aging, reference voltage also can change, and causes the measurement of satellite temperature to occur error; Two, the size of build-out resistor is directly connected to the partial pressure value of thermistor, and the thermistor resistance that the voltage parameter using in measuring process characterizes, therefore thermometric can produce error; Three, in carrying out AD transfer process, the quantization error of AD also can exert an influence to pin-point accuracy, high precision measuring temperature; Four, while processing in the face of satellite temperature remote measurement on ground, the curve of use also can produce error.
The existence of above-mentioned error, has formed huge challenge for realizing satellite pin-point accuracy thermometric.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of temperature measurement error analytical approach based on satellite temperature remote measurement, and it is the error in analysis to measure process accurately, thereby can calculate compensation to each temperature survey, realizes pin-point accuracy thermometric.
The present invention solves above-mentioned technical matters by following technical proposals: a kind of temperature measurement error analytical approach based on satellite temperature remote measurement, it is characterized in that, and it comprises the following steps:
Step 1, by the calibration table of thermistor, simulate thermistor curvilinear equation, simultaneously digital simulation curvilinear equation is when carrying out temperature survey and the error of fitting of actual temperature, according to the size of error of fitting, determine the exponent number of matched curve and the coefficient of fit equation, determine the best fit equation of thermistor;
Whether step 2, reference voltage are obtained by the descending remote measurement of satellite, judge consistent with circuit design size; If consistent, reference voltage does not produce error; If inconsistent, the definite temperature measurement error being caused by the deviation of reference voltage of computing method of the temperature measurement error causing according to the precision by reference voltage base;
More whether step 3, thermometric build-out resistor, before installation, need through demarcating, and obtain its resistance size, consistent with design load size; If consistent, do not produce error; If inconsistent, according to the computing method of the error being produced by thermometric build-out resistor, calculate the temperature measurement error that the deviation by thermometric build-out resistor causes;
Step 4, the remote temperature sensing true form of resolving according to the quantization digit of AD transducer and ground receiving demodulation device, calculate the quantization error scope being caused by AD transducer according to the quantization error being caused by AD transducer;
The mathematical principle error of step 5, COMPREHENSIVE CALCULATING and estimation satellite temp measuring system.
Preferably, the described temperature measurement error analytical approach based on satellite temperature remote measurement adopts satellite temperature measuring system to realize, satellite temperature measuring system comprises thermometric build-out resistor, thermistor, AD transducer, on star, modulate emitter, ground receiving demodulation device, thermometric build-out resistor and thermistor series connection, reference voltage is series circuit power supply, thermistor both end voltage is as the input of AD transducer, digital signal after AD quantizes, by modulating emitter on star, modulate, radiofrequency signal transmits ground receiving station, ground receiving demodulation device is isolated satellite temperature remote measurement.
Positive progressive effect of the present invention is: the present invention is the error in analysis to measure process accurately, thereby can calculate compensation to each temperature survey, realizes pin-point accuracy thermometric.
Accompanying drawing explanation
Fig. 1 is the theory diagram of satellite temperature measuring system.
Fig. 2 is the process flow diagram that the present invention is based on the temperature measurement error analytical approach of satellite temperature remote measurement.
Fig. 3 is the process flow diagram that in the present invention, error of fitting is processed.
Fig. 4 is the equivalent theory diagram of the present invention to Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, provide preferred embodiment of the present invention, to describe technical scheme of the present invention in detail.
As shown in Figure 1, the temperature measurement error analytical approach that the present invention is based on satellite temperature remote measurement also adopts above-mentioned satellite temperature measuring system to realize, and satellite temperature measuring system comprises thermometric build-out resistor R p, thermistor R r, modulate emitter, ground receiving demodulation device, thermometric build-out resistor R on AD transducer, star pwith thermistor R rseries connection, reference voltage V is series circuit power supply, thermistor R rboth end voltage is as the input of AD transducer, and the digital signal after AD quantizes, modulates by modulating emitter on star, and radiofrequency signal transmits ground receiving station, and ground receiving demodulation device is isolated satellite temperature remote measurement.
As shown in Figure 2, the temperature measurement error analytical approach that the present invention is based on satellite temperature remote measurement comprises the following steps:
Step 1, by thermistor R rcalibration table (the resistance magnitude relationship of thermistor under different temperatures), simulate thermistor curvilinear equation, simultaneously digital simulation curvilinear equation when carrying out temperature survey and the Ni of actual temperature close Wu Cha ⊿ T lH, according to the size of error of fitting, determine the exponent number of matched curve and the coefficient of fit equation, determine thermistor R rbest fit equation F min(R); Close Wu Cha ⊿ T lHdetailed process as follows: satellite is used before thermistor temperature detecting, each thermistor obtains thermistor calibration table through demarcating, what in table, reflect is the resistance of thermistor under different temperatures, generally, demarcating temperature-measuring range is-200-100 ℃, within the scope of-100-80 ℃, Accurate Calibration is carried out in 1 ℃ of stepping.Therefore need to carry out curve fitting to thermistor during floor treatment, obtain the polynomial equation of temperature and thermistor resistance.In this method, curve-fitting method is least square method, and the exponent number of matching can be selected according to the error after matching, and the method for matching is: from three rank matchings of curve, calculate three rank Ni and close Wu Cha ⊿ T lH3=F 3(R)-T, Chu Shiization ⊿ T lHmin=⊿ T lH3; Carry out quadravalence curve, and obtain quadravalence Ni and close Wu Cha ⊿ T lH4=F 4(R)-T, Bi compare ⊿ T lHminyu ⊿ T lH4size, carry out iteration.As shown in Figure 3, carry out after 7 matchings relatively, obtain the event ⊿ T of error lHmin, matched curve equation Xuan Ze is Yu ⊿ T lHmincorresponding best fit equation F min(R).
Whether step 2, reference voltage V are obtained by the descending remote measurement of satellite, judge consistent with circuit design size; If consistent, reference voltage V does not produce error; If inconsistent, the definite thermometric Wu Cha ⊿ T being caused by the deviation of reference voltage V of computing method of the temperature measurement error causing according to the precision by reference voltage V base v; Being described as follows of the temperature measurement error being caused by the deviation of reference voltage V: the temperature measurement error being caused by the precision of reference voltage V base refers to that reference voltage is as the power supply in thermistor temperature detecting circuit, and the variation in measuring process will cause producing error in temperature survey and processing procedure.Based on satellite temperature measurement circuit, in temperature T 0time, the standard resistance of thermistor is R rV, by Fig. 1, can obtain thermistor both end voltage and should be formula (2):
V r 0 = V * R rV R p + R rV Formula (2)
The size of V reference voltage wherein, R pthe size of build-out resistor, the physical significance of this formula is: thermistor is in temperature T 0time, not only with R rVcorrespondence, goes back and V r0mark is corresponding, and " in set circuit, thermistor both end voltage is V r0time, the temperature of thermistor is T 0".
Now suppose that variation has occurred satellite reference voltage, reference voltage is V ', and the resistance value of measuring according to formula (2) so should be formula (3):
R rV ′ = R p V ′ / V r 0 - 1 Formula (3)
This formula shows: at T 0(thermistor both end voltage V=V during temperature r0), reference voltage is V ' time, the resistance at thermistor two ends is R rV'.Therefore at T 0during temperature, (thermistor both end voltage is V r0), reference voltage is V ' time, by calculating the now temperature of thermosensitive resistance measurement, should be formula (4):
T test=F min(R rV') ... formula (4)
At satellite, with in temperature measurement circuit, temperature is T 0in situation, the thermistor temperature detecting error being caused by reference voltage is formula (5):
Δ T v=T test-T 0=F min(R rV')-T 0formula (5)
Step 3, thermometric build-out resistor R pbefore installation, need through demarcating, obtain its resistance size, more consistent with design load size; If consistent, do not produce error; If inconsistent, according to by thermometric build-out resistor R pthe computing method of the error producing are calculated by thermometric build-out resistor R pthe thermometric Wu Cha ⊿ T that causes of deviation p; By thermometric build-out resistor R pbeing described as follows of the temperature measurement error that causes of deviation: by build-out resistor R pthe temperature measurement error that causes of precision refer to that build-out resistor is as the divider resistance in thermistor temperature detecting circuit, reference resistance changes, to cause the dividing potential drop output of thermistor two ends to change, cause the resistance of thermistor both end voltage reflection to change, thereby cause the temperature of measuring to produce error.Based on satellite temperature measurement circuit, in temperature T 0time, the standard resistance of thermistor is R rV, by Fig. 1, can obtain thermistor both end voltage and should be formula (6):
V r 0 = V * R rV R p + R rV Formula (6)
The size of V reference voltage wherein, R pthe size of build-out resistor, the physical significance of this formula is: thermistor is in temperature T 0time, not only with R rVcorrespondence, goes back and V r0mark is corresponding, and " in set circuit, thermistor both end voltage is V r0timestamp, the temperature of thermistor is T 0".
When considering that precision by build-out resistor produces error, do not consider the impact that reference voltage V produces, and V r0r pfunction, therefore " in set circuit, thermistor both end voltage is V r0timestamp, the temperature of thermistor is T 0" be equivalent to that " in set circuit, build-out resistor is R ptime, the temperature of thermistor is T 0".
There is variation in the build-out resistor of now supposing satellite temperature measurement circuit, resistance size is R p', the resistance value of measuring according to formula 2 so should be formula (7):
R rp ′ = R p ′ V / V r 0 - 1 Formula (7)
This formula shows: at T 0during temperature, build-out resistor is R pin ' time, the resistance at thermistor two ends is R rp'.Therefore at T 0during temperature, build-out resistor is R pin ' time, by calculating the now temperature of thermosensitive resistance measurement, should be formula (8):
T test=F min(R rp') ... formula (8)
At satellite, with in temperature measurement circuit, temperature is T 0in situation, the thermistor temperature detecting degree error being caused by build-out resistor is formula (9):
Δ T p=T test-T 0=F min(R rp')-T 0formula (9)
Step 4, the remote temperature sensing true form V resolving according to the quantization digit of AD transducer and ground receiving demodulation device t, according to the quantization error being caused by AD transducer, calculate the quantization error Fan Wei ⊿ T being caused by AD transducer aD; AD quantization error refers to the analog to digital conversion of measuring as satellite temperature, and consequent quantization error, is also in whole measuring process.After AD conversion, satellite carries out Digital Modulation, and ground receives after signal, carries out digital demodulation, is not easy to occur error code, i.e. V l=V ttherefore Fig. 1 can simplify and is equivalent to Fig. 4.
Based on Fig. 4 satellite temperature measurement circuit, when temperature T, the voltage at thermistor two ends is V r, by Fig. 1, can obtain thermistor resistance R rfor formula (10):
R r = R p V / V r - 1 Formula (10)
Ground is according to remote measurement V twhile calculating the resistance of thermistor, think that the resistance size of thermistor is formula (11):
R r ′ = R p V / V L - 1 Formula (11)
Generally, R r≠ R r', this error is that the quantification in satellite AD conversion process causes, by R rand R r' substitution fit equation, obtains quantizing by AD the Wu Cha ⊿ T causing aD, suc as formula (12):
Δ T aD=F min(R r')-F min(R r) ... formula (12)
R in above formula r' can calculate by VL; But V rfor satellite temperature measurement circuit intermediate value, cannot know, therefore R rcannot determine, therefore cannot definite get Dao ⊿ T aD.
Satellite AD is transformed to the uniform quantization of N bit, therefore quantization level V lwith V rthere is following relation:
utilize this relation to estimate AD quantization error, obtain formula (13):
ΔT AD ∈ [ F min ( R p V / V L - 1 ) - F min ( R p V / [ V L + V / ( 2 N + 1 - 2 ) ] - 1 ) ,
F min ( R p V / V L - 1 ) - F min ( R p V / [ V L - V / ( 2 N + 1 - 2 ) ] - 1 ) ] Formula (13)
Or formula (14)
ΔT AD ∈ [ F min ( R p V / V L - 1 ) - F min ( R p V / [ V L - V / ( 2 N + 1 - 2 ) ] - 1 ) ,
F min ( R p V / V L - 1 ) - F min ( R p V / [ V L + V / ( 2 N + 1 - 2 ) ] - 1 ) ] Formula (14)
AD quantization error is a uncertain value, but can determine by AD quantize the error range bring in measuring process, this error range be pin-point accuracy thermometric as a reference.
The mathematical principle error of step 5, COMPREHENSIVE CALCULATING and estimation satellite temp measuring system.
As mentioned above, maximum feature of the present invention is the mathematical model that has provided error analysis in thermometric process, solve the quantification problem of the error producing in satellite temperature measuring process, utilize the present invention to carry out mathematics quantification to temperature measurement error, reached the object of high precision, high precision measuring temperature.The present invention is based on partial pressure type temperature measuring circuit, angle from system, the error that satellite temperature remote measurement is produced produces error to floor treatment and need to always analyze, provided the mathematical model of error analysis in thermometric process, solved the error producing in satellite temperature measuring process, utilize the present invention to carry out mathematics quantification to temperature measurement error, realized the target of high precision thermometric.
Those skilled in the art can carry out various remodeling and change to the present invention.Therefore, the present invention has covered various remodeling and the change in the scope that falls into appending claims and equivalent thereof.

Claims (2)

1. the temperature measurement error analytical approach based on satellite temperature remote measurement, is characterized in that, it comprises the following steps:
Step 1, by the calibration table of thermistor, simulate thermistor curvilinear equation, simultaneously digital simulation curvilinear equation is when carrying out temperature survey and the error of fitting of actual temperature, according to the size of error of fitting, determine the exponent number of matched curve and the coefficient of fit equation, determine the best fit equation of thermistor;
Whether step 2, reference voltage are obtained by the descending remote measurement of satellite, judge consistent with circuit design size; If consistent, reference voltage does not produce error; If inconsistent, the definite temperature measurement error being caused by the deviation of reference voltage of computing method of the temperature measurement error causing according to the precision by reference voltage base;
More whether step 3, thermometric build-out resistor, before installation, need through demarcating, and obtain its resistance size, consistent with design load size; If consistent, do not produce error; If inconsistent, according to the computing method of the error being produced by thermometric build-out resistor, calculate the temperature measurement error that the deviation by thermometric build-out resistor causes;
Step 4, the remote temperature sensing true form of resolving according to the quantization digit of AD transducer and ground receiving demodulation device, calculate the quantization error scope being caused by AD transducer according to the quantization error being caused by AD transducer;
The mathematical principle error of step 5, COMPREHENSIVE CALCULATING and estimation satellite temp measuring system.
2. the temperature measurement error analytical approach based on satellite temperature remote measurement as claimed in claim 1, it is characterized in that, the described temperature measurement error analytical approach based on satellite temperature remote measurement adopts satellite temperature measuring system to realize, satellite temperature measuring system comprises thermometric build-out resistor, thermistor, AD transducer, on star, modulate emitter, ground receiving demodulation device, thermometric build-out resistor and thermistor series connection, reference voltage is series circuit power supply, thermistor both end voltage is as the input of AD transducer, digital signal after AD quantizes, by modulating emitter on star, modulate, radiofrequency signal transmits ground receiving station, ground receiving demodulation device is isolated satellite temperature remote measurement.
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CN105302188A (en) * 2015-09-21 2016-02-03 上海卫星工程研究所 Method for controlling temperature difference between two ends of U-shaped frame
CN111143911A (en) * 2019-12-12 2020-05-12 上海卫星工程研究所 Data processing method and system for satellite temperature remote measurement

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CN105302188A (en) * 2015-09-21 2016-02-03 上海卫星工程研究所 Method for controlling temperature difference between two ends of U-shaped frame
CN111143911A (en) * 2019-12-12 2020-05-12 上海卫星工程研究所 Data processing method and system for satellite temperature remote measurement

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