CN201094017Y - Atmospheric pressure altimeter - Google Patents
Atmospheric pressure altimeter Download PDFInfo
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- CN201094017Y CN201094017Y CNU2007200413743U CN200720041374U CN201094017Y CN 201094017 Y CN201094017 Y CN 201094017Y CN U2007200413743 U CNU2007200413743 U CN U2007200413743U CN 200720041374 U CN200720041374 U CN 200720041374U CN 201094017 Y CN201094017 Y CN 201094017Y
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Abstract
The utility model discloses an atmospheric pressure altimeter, comprising a measuring unit, an interface communication circuit and a system power supply, wherein, an altimeter amplifier and a digital-to-analog converter are integrated in the inner part of an atmospheric sensor inside the measuring unit, the atmospheric pressure is converted into a barometric height signal, after the barometric height is measured, a TLT level is outputted to a logic level converting circuit inside the interface communication circuit to be converted into a differential signal to be outputted; the system power supply after the process of depressurization is respectively transmitted to a sensor and a microprocessor feed circuit as well as the interface communication power circuit, the latter supplies power to the digital baroceptor and the microprocessor as well as the interface communication circuit respectively. The utility model adopts the digital output type baroceptor, and the inner part of the baroceptor is provided with a temperature sensor for compensating the temperature of the measurement of the barometric height, thereby greatly simplifying the circuit and reducing the volume; the amplifier and the digital-to-analog converter are integrated inside the sensor, thereby effectively increasing the ability of the system to be against interference.
Description
One, technical field:
The utility model relates to a kind of barometric altimeter, and it is to utilize the variation of differing heights atmospheric pressure to determine equipment highly, belongs to aerospace field.
Two, background technology:
At present big, the Heavy Weight of the used barometric altimeter volume of China's unmanned plane, interference free performance is poor, precision is low, very inconvenience in use.Barometric altimeter originally consists of the following components: the interface communication circuit of small-signal baroceptor, amplifying circuit, analog to digital conversion circuit, microprocessor, RS-485 or RS-232 serial communication protocol, system power supply circuit etc., because the circuit component part is more thereby volume is big, Heavy Weight; Because what adopt is the baroceptor of small-signal output, the small-signal of exporting because of sensor is easy to be subjected to outside electromagnetic interference, and to pass through links ability and Microprocessor Interface such as amplifying circuit, analog to digital conversion circuit, introduce the approach that disturbs and increase, thereby be subject to disturb.Because interference free performance is poor, when electromagnetic interference (EMI) was arranged, the output of baroceptor had violent conversion, trembles the rudder phenomenon and cause.At these situations, " the HCDG485/232 interface barometric altimeter " of Nanjing HangCheng Science Co., Ltd's exploitation effectively solved the problems referred to above.
Three, summary of the invention:
The purpose of this utility model provides a kind of precision height, volume is little, antijamming capability is strong barometric altimeter, and that can avoid effectively that electromagnetic interference (EMI) because of engine produces trembles the rudder phenomenon.
A kind of barometric altimeter described in the utility model comprises barometric leveling unit, interface communication circuit and system power supply three parts, it is characterized in that:
Described barometric leveling unit comprises digital baroceptor and coupled microprocessor, digital baroceptor is inner integrated can be with the atmospheric pressure that measures directly with the instrument amplifier and the analog to digital converter of digital signal form output, microprocessor receives the atmospheric pressure altitude signal of the standard that is converted into behind the atmospheric pressure that baroceptor detects, and this signal is transferred to the interface communication circuit
The interface communication circuit comprises logic level converting circuit and interface communication circuit, the barometric leveling unit is measured back output Transistor-Transistor Logic level with barometer altitude and is given logic level converting circuit, and volume level shifting circuit converts Transistor-Transistor Logic level the form of RS-485 differential signal or RS-232 level to also by the output of interface communication circuit;
System power supply comprises reduction voltage circuit, sensor and microprocessor power supply circuit, interface communication power circuit, system power supply is transferred to sensor and microprocessor power supply circuit and interface communication power circuit respectively after by the reduction voltage circuit step-down, gives digital baroceptor, microprocessor and interface communication circuit supply respectively by sensor and microprocessor power supply circuit again.
Above-mentioned digital baroceptor inside can integrated temperature sensor, and the air pressure signal of digital baroceptor output is to realize temperature compensation through temperature sensor.
Above-mentioned interface communication circuit is the interface communication circuit of RS-485 and RS-232 serial communication protocol, and the interface communication circuit of RS-485 and RS-232 serial communication protocol converts Transistor-Transistor Logic level to the form output of RS-485 differential signal or RS-232 level.
When the interface communication circuit that adopts RS-485 and RS-232 serial communication protocol, system power supply is+12V imports power supply, after adopting secondary voltage stabilizing step-down, reduction voltage circuit is converted to+5V, + 5V gives the interface communication circuit supply of RS-485 and RS-232 serial communication protocol, reduction voltage circuit general+5V more further the lowering and stabilizing blood pressure power supply that is converted to two-way+3V give digital baroceptor and microprocessor power supply respectively, and logic level converting circuit by+3V and+5V powers simultaneously.
Important characteristic of interface barometric altimeter of the present utility model is, adopt highly integrated, high-precision digital output type baroceptor, this sensor internal is integrated with temperature sensor, can be used for temperature compensation is carried out in the measurement of barometer altitude, do not need other temperature sensor, thereby can simplify circuit greatly, thereby reach the purpose that reduces volume; This sensor internal is integrated amplifier and analog to digital converter can effectively increase the antijamming capability of system.
This altitude gauge adopts high precision baroceptor and high speed microminiature high-performance microprocessor to form, and has the following advantages:
1. this altitude gauge has the refresh rate height, reach per second 30 times, and original product can only reach per second 20 times.
2. the anti-electromagnetic interference (EMI) intensity of this altitude gauge height, intercom switch moment is noiseless.And the original product anti-electromagnetic interference capability is poor, intercom switch moment even can not work.
3. the start of this altitude gauge is very short preheating time, and numerical stability is good, and little (1-2 rice) highly drifts about.And the original product start is long preheating time, pines for altitude information in advance and can drift about tens meters even up to a hundred meters.
4. this altitude gauge has digital temperature output, and effect temperature compensation is remarkable, and thermal stability is fine.Original product does not then have temperature-sensing element (device), adopts analog compensation, so effect is poor.
5. this altitude gauge volume is little, and is in light weight.
Four, description of drawings:
Fig. 1 is a structured flowchart of the present utility model;
Fig. 2 is the circuit theory diagrams of the present utility model that adopt the interface communication circuit of RS-485 and RS-232 serial communication protocol.
Five, embodiment:
As depicted in figs. 1 and 2, barometric altimeter described in the utility model comprises barometric leveling unit, interface communication circuit and system power supply three parts,
1, barometric leveling unit: form by digital baroceptor, microprocessor, by sensor in the system power supply and microprocessor power supply circuit supply.The atmospheric pressure that this digital baroceptor is inner integrated instrument amplifier and analog to digital converter can measure is directly with the form output of digital signal, this baroceptor inside is integrated with digital temperature sensor again, and the digital air pressure signal of baroceptor output is through temperature compensation.After microprocessor receives the atmospheric pressure of sensor, atmospheric pressure is converted into the atmospheric pressure height of standard, has promptly realized the measurement of barometer altitude.Baroceptor and microprocessor use the power supply power supply of two-way+3V, can direct interface between sensor and the microprocessor, do not need logic level converting circuit, and can make circuit succinctly reliable; Adopting the accurate voltage stabilizing chip of two+3V is that microprocessor and sensor are powered respectively, can avoid the phase mutual interference, for providing stable clean direct current source to provide reliable assurance for measuring barometer altitude accurately, and the low voltage power supply of employing+3V can effectively reduce system power dissipation.
2, interface communication circuit: interface communication circuit, logic level converting circuit by RS-485 and RS-232 serial communication protocol are formed, output was Transistor-Transistor Logic level after barometer altitude was measured in the barometric leveling unit, and the interface communication circuit of RS-485 and RS-232 serial communication protocol converts Transistor-Transistor Logic level to the form output of RS-485/RS-232 differential signal; The power supply of microprocessor employing+3V power supply, the interface communication circuit chip employing+5V power supply power supply of RS-485 and RS-232 serial communication protocol, the two interface logic level does not match, adopt the logic level transition chip of a special use to constitute logic level converting circuit, can effectively guarantee communication reliably between different microprocessors and the interface communication circuit chip.
3, system power supply: the interface communication power circuit by reduction voltage circuit, sensor and microprocessor power supply circuit, RS-485 and RS-232 serial communication protocol is formed; System power supply is+12V imports power supply, be converted to+5V after adopting secondary voltage stabilizing step-down, + 5V gives the interface communication circuit supply ,+5V more further the lowering and stabilizing blood pressure power supply that is converted to two-way+3V give baroceptor and microprocessor power supply, wherein logic level converting circuit by+3V and+5V powers simultaneously.Adopt the secondary lowering and stabilizing blood pressure to effectively raise the antijamming capability of system power supply, allow the mains fluctuations scope can reach 10V-16V.
Table 1 has provided the Component List of present embodiment.
The important technological parameters of present embodiment:
1. measurement range and precision
Range :-300 meters-6000 meters
Precision:
| The height point | Measuring accuracy |
| 0 meter | ± 2 meters |
| 300 meters | ± 10 meters |
| 1000 meters | ± 15 meters |
| 3000 meters | ± 30 meters |
Resolution: 0.1 meter
Sampling rate: 30 times/second
Temperature range :-20 ℃-+60 ℃
Storing temperature :-40 ℃-+85 ℃
Pressure limit: 1-110kPa
Overvoltage: 10bar
Power consumption: about 20mA
Supply voltage :+12V (allowing scope range of the fluctuation of voltage 10V-16V)
Table 1: barometric altimeter Component List
| Sequence number | Quantity | Specifications and models | Label | Title |
| 1 | 1 | 0Ω 0805±5％ | R3 | Metalfilmresistor |
| 2 | 1 | 120Ω 0805±5％ | R10 | |
| 3 | 1 | 3kΩ 0805±5％ | R5 | |
| 4 | 2 | 10kΩ 0805±5％ | R1 R2 | Metalfilmresistor |
| 5 | 1 | 2kΩ 0805±5％ | R4 | Metalfilmresistor |
| 6 | 4 | 1uF 0805±20％ | C13 C14C15 C16 | Ceramic condenser |
| 7 | 10 | 104 0805±20％ | C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 | Ceramic condenser |
| 8 | 2 | 20pF 0805±20％ | C11 C12 | Ceramic condenser |
| 9 | 4 | 47uF/25V 476 | E1 E2 E3 E4 | Tantalum electric capacity |
| 10 | 1 | Single round jack 6 pin | J1 | Single round jack |
| 11 | 1 | IN4007 | D1 | Diode |
| 12 | 1 | 36.6864MHz | Y1 | Crystal |
| 13 | 1 | 78M05 D-PAK | U5 | Stabilivolt |
| 14 | 1 | 7809 D-PAK | U4 | Stabilivolt |
| 15 | 1 | ATMEGA8-TOFP-32 | U3 | Single-chip microcomputer |
| 16 | 1 | MS5534BM | S1 | Baroceptor |
| 17 | 2 | NCP500SN30T1 | W1 W2 | The voltage stabilizing chip |
| 18 | 1 | SN65HVD3082ED | U6 | The RS-485 chip |
| 19 | 1 | MAX232CSE | U7 | The RS-232 |
| 20 | 2 | SN74LVC1T45DBVR | U1 U2 | The logic level transition chip |
Claims (3)
1. a barometric altimeter comprises barometric leveling unit, interface communication circuit and system power supply three parts, it is characterized in that:
Described barometric leveling unit comprises digital baroceptor and coupled microprocessor, digital baroceptor is inner integrated can be with the atmospheric pressure that measures directly with the instrument amplifier and the analog to digital converter of digital signal form output, microprocessor receives the atmospheric pressure altitude signal of the standard that is converted into behind the atmospheric pressure of sensor, and this signal is transferred to the interface communication circuit
The interface communication circuit comprises logic level converting circuit and interface communication circuit, the barometric leveling unit is measured back output Transistor-Transistor Logic level with barometer altitude and is given logic level converting circuit, and volume level shifting circuit converts Transistor-Transistor Logic level the form of differential signal to also by the output of interface communication circuit;
System power supply comprises reduction voltage circuit, sensor and microprocessor power supply circuit, interface communication power circuit, system power supply is transferred to sensor and microprocessor power supply circuit and interface communication power circuit respectively after by the reduction voltage circuit step-down, gives digital baroceptor, microprocessor and interface communication circuit supply respectively by sensor and microprocessor power supply circuit again.
2. according to the described barometric altimeter of claim 1, it is characterized in that: the interface communication circuit is the interface communication circuit of RS-485 and RS-232 serial communication protocol, and the interface communication circuit of RS-485 and RS-232 serial communication protocol converts Transistor-Transistor Logic level to the form output of RS-485 differential signal or RS-232 level.
3. according to claim 1 or 2 described barometric altimeters, it is characterized in that: system power supply is imported power supply for+12V, after adopting secondary voltage stabilizing step-down, reduction voltage circuit is converted to+5V, + 5V gives the interface communication circuit supply of RS-485 and RS-232 serial communication protocol, reduction voltage circuit general+5V more further the lowering and stabilizing blood pressure power supply that is converted to two-way+3V give digital baroceptor and microprocessor power supply respectively, and logic level converting circuit by+3V and+5V powers simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200413743U CN201094017Y (en) | 2007-08-06 | 2007-08-06 | Atmospheric pressure altimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200413743U CN201094017Y (en) | 2007-08-06 | 2007-08-06 | Atmospheric pressure altimeter |
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| Publication Number | Publication Date |
|---|---|
| CN201094017Y true CN201094017Y (en) | 2008-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200413743U Expired - Fee Related CN201094017Y (en) | 2007-08-06 | 2007-08-06 | Atmospheric pressure altimeter |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995236B (en) * | 2009-08-25 | 2013-01-09 | 佛山市顺德区顺达电脑厂有限公司 | System and method for correcting reference value of pressure conversion altitude |
| CN103453883A (en) * | 2013-08-31 | 2013-12-18 | 西北工业大学 | Unmanned plane pressure altitude change rate measurement system |
| CN105388906A (en) * | 2015-11-30 | 2016-03-09 | 无锡觅睿恪科技有限公司 | Height detection remote control for unmanned aerial vehicle (UAV) |
| CN105606071A (en) * | 2016-03-03 | 2016-05-25 | 成都仁颐越立科技有限公司 | Atmospheric pressure altimeter based on GPS positioning and temperature correcting and correcting method |
| CN105973774A (en) * | 2016-01-29 | 2016-09-28 | 安徽大学 | Air quality detection system based on unmanned aerial vehicle platform |
| US9604134B2 (en) | 2012-05-23 | 2017-03-28 | Ams International Ag | Device control system and method of determining altitude |
| CN107560598A (en) * | 2017-09-18 | 2018-01-09 | 中国科学院国家天文台 | A kind of barometric information acquisition module and difference barometric leveling system and method |
| CN107917713A (en) * | 2017-10-19 | 2018-04-17 | 深圳市金立通信设备有限公司 | A kind of method, terminal and computer-readable medium for calculating air line distance |
| CN107941410A (en) * | 2017-11-18 | 2018-04-20 | 衡阳县海得利网络技术有限公司 | Variable displacement type baroceptor and the dedicated height above sea level clear height sensing equipment of smart mobile phone |
| CN111397551A (en) * | 2020-03-11 | 2020-07-10 | 支付宝(杭州)信息技术有限公司 | Displacement identification method and device based on air pressure |
| CN111750823A (en) * | 2020-05-29 | 2020-10-09 | 深圳市梦网物联科技发展有限公司 | Helmet height positioning method and system |
-
2007
- 2007-08-06 CN CNU2007200413743U patent/CN201094017Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995236B (en) * | 2009-08-25 | 2013-01-09 | 佛山市顺德区顺达电脑厂有限公司 | System and method for correcting reference value of pressure conversion altitude |
| US9604134B2 (en) | 2012-05-23 | 2017-03-28 | Ams International Ag | Device control system and method of determining altitude |
| CN103453883A (en) * | 2013-08-31 | 2013-12-18 | 西北工业大学 | Unmanned plane pressure altitude change rate measurement system |
| CN105388906A (en) * | 2015-11-30 | 2016-03-09 | 无锡觅睿恪科技有限公司 | Height detection remote control for unmanned aerial vehicle (UAV) |
| CN105973774A (en) * | 2016-01-29 | 2016-09-28 | 安徽大学 | Air quality detection system based on unmanned aerial vehicle platform |
| CN105606071A (en) * | 2016-03-03 | 2016-05-25 | 成都仁颐越立科技有限公司 | Atmospheric pressure altimeter based on GPS positioning and temperature correcting and correcting method |
| CN107560598A (en) * | 2017-09-18 | 2018-01-09 | 中国科学院国家天文台 | A kind of barometric information acquisition module and difference barometric leveling system and method |
| CN107560598B (en) * | 2017-09-18 | 2020-08-21 | 中国科学院国家天文台 | Air pressure data acquisition module and differential air pressure height measurement system and method |
| CN107917713A (en) * | 2017-10-19 | 2018-04-17 | 深圳市金立通信设备有限公司 | A kind of method, terminal and computer-readable medium for calculating air line distance |
| CN107941410A (en) * | 2017-11-18 | 2018-04-20 | 衡阳县海得利网络技术有限公司 | Variable displacement type baroceptor and the dedicated height above sea level clear height sensing equipment of smart mobile phone |
| CN111397551A (en) * | 2020-03-11 | 2020-07-10 | 支付宝(杭州)信息技术有限公司 | Displacement identification method and device based on air pressure |
| CN111397551B (en) * | 2020-03-11 | 2021-07-20 | 支付宝(杭州)信息技术有限公司 | Displacement identification method and device based on air pressure |
| CN111750823A (en) * | 2020-05-29 | 2020-10-09 | 深圳市梦网物联科技发展有限公司 | Helmet height positioning method and system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080730 Termination date: 20110806 |