CN102360071A - Method and apparatus for verification of linear frequency modulation continuous wave of radio digital altimeter - Google Patents
Method and apparatus for verification of linear frequency modulation continuous wave of radio digital altimeter Download PDFInfo
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- CN102360071A CN102360071A CN2011101718769A CN201110171876A CN102360071A CN 102360071 A CN102360071 A CN 102360071A CN 2011101718769 A CN2011101718769 A CN 2011101718769A CN 201110171876 A CN201110171876 A CN 201110171876A CN 102360071 A CN102360071 A CN 102360071A
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Abstract
The invention, which belongs to the radio digital altimeter verification technology field, relates to a method and an apparatus for verification of a linear frequency modulation continuous wave of a radio digital altimeter. The method comprises the following steps that: a digital circuit portion controls a vco to generate a linear frequency modulated microwave; a directional coupler is utilized to enable a microwave signal to be coupled at a next level of the vco; beat frequency is carried out on the coupled microwave signal and a signal that is generated by a local oscillator through a frequency differentiator; frequency division is carried out on the microwave signal that has been processed by the beat frequency through a frequency divider so as to obtain a frequency division signal; and according to a value of a collected frequency division signal, it is determined whether the linear frequency modulated microwave meets a requirement; if not, corresponded adjustment is carried out. According to the invention, accurate verification of an altimeter is realized, so that the whole apparatus has advantages of reliable performance, high precision, low power consumption, strong anti-interference capability, small volume and light weight and the like.
Description
Technical field
The present invention relates to a kind of radiodigital height indicator linear frequency modulation continuous wave method of calibration and device, belong to radiodigital height indicator calibration technology field.
Background technology
Radar altimeter is to measure the aircraft airborne radio installation that vertical range is used to ground, is one of important aircraft instrument.It is made up of emission, receiver module and digital control module.Aircraft is emitting radio wave earthward, after ground return, is equaled the quotient that the twice flying height is removed by radio wave propagation speed by the used time of stroke of aircraft receiver reception radiowave experience twice flying height H.The speed of radio wave propagation is constant, as long as just measure during this period of time and can obtain flying height.Radio altimeter is divided into two kinds of frequency modulation type and pulseds by working method.
The principle of work of the linear frequency modulation continuous wave height indicator in the existing radio altimeter is: adopt sawtooth wave or triangular wave linear frequency modulation microwave generating source; Through emitting antenna radiation constant amplitude frequency-modulated wave, through and the directly proportional time delay τ of aircraft altitude, by the ground surface launching and be received antenna and receive; Output Beat Signal fb after mixing; This signal by amplifier amplification, the filtering of a gain with height change, is delivered to the tracking frequency discriminator after the narrow band filter frequency-selecting.Whether the tracking frequency discriminator is exported high and low decibel meter differential bat signal and is got in the track band, and control module falls in the track band Beat Signal according to the slope that keeps or adjust triangular wave all the time, keeps steady state value.Total system constitutes closed loop through ground, and the height of aircraft is decided by the slope and the maximum frequency deviation Δ f of triangular wave.
Only do not add checking treatment as the linear frequency modulation microwave generating source and can not produce a more satisfactory linear frequency modulation microwave with the vco of present stage; It can be along with temperature and humidity produces some deviations; And each vco microwave that a magnitude of voltage can not produce identical frequency because the technology difference is given it comes out, and bring very big error will for so last measurement result.After accuracy requirement required to acquire a certain degree, this had just become the bottleneck that must cross over.
Summary of the invention
The purpose of this invention is to provide a kind of dependable performance, precision is high, low in energy consumption, antijamming capability is strong radiodigital height indicator linear frequency modulation continuous wave method of calibration and device.
The objective of the invention is to realize through following technical scheme:
A kind of radiodigital height indicator linear frequency modulation continuous wave method of calibration comprises:
Partly control vco by digital circuit and produce the linear frequency modulation microwave;
Be coupled through directional coupler general who has surrendered microwave signal at the vco next stage;
Through the difference frequency device microwave signal of coupling and the signal of a local oscillator generation are carried out difference frequency;
The microwave signal that to pass through difference frequency through frequency divider is carried out frequency division and is obtained a fractional frequency signal;
Value according to the fractional frequency signal that collects judges whether said linear frequency modulation microwave meets the requirements, if undesirable, then adjusts accordingly.
A kind of radiodigital height indicator linear frequency modulation continuous wave calibration equipment comprises:
The microwave generation module is used for partly controlling vco by digital circuit and produces the linear frequency modulation microwave;
The microwave coupling module is used at the vco next stage through the coupling of directional coupler general who has surrendered microwave signal;
Microwave difference frequency module is used for through the difference frequency device microwave signal of coupling and the signal of a local oscillator generation being carried out difference frequency;
The microwave frequency division module is used for carrying out frequency division through the microwave signal that frequency divider will pass through difference frequency and obtains a fractional frequency signal;
The microwave adjusting module is used for judging according to the value to the fractional frequency signal that collects whether said linear frequency modulation microwave meets the requirements, if undesirable, then adjusts accordingly.
Technical scheme provided by the invention is fallen the microwave signal coupling technique through linear frequency modulation microwave, CW with frequency modulation, coupling mechanism, cooperates difference frequency device difference frequency signal, frequency divider fractional frequency signal; Digital signal processing, Digital Circuit Control vco linear frequency modulation technology is utilized the circuit modular design; Realized the accurate verification of height indicator, thereby made complete machine have dependable performance that precision is high; Low in energy consumption, characteristics such as antijamming capability is strong, volume is little, in light weight.
Description of drawings
Fig. 1 is the schematic flow sheet of the radiodigital height indicator linear frequency modulation continuous wave method of calibration that provides of the specific embodiment of the invention;
Fig. 2 is the electrical block diagram of the generation linear frequency modulation microwave that provides of the specific embodiment of the invention;
Fig. 3 is the electrical block diagram with the microwave signal coupling that the specific embodiment of the invention provides;
Fig. 4 is the electrical block diagram that signal that the microwave signal that provides of the specific embodiment of the invention and local oscillator produce carries out difference frequency;
Fig. 5 be the specific embodiment of the invention provide carry out the electrical block diagram that frequency division obtains fractional frequency signal;
Fig. 6 be the specific embodiment of the invention provide microwave signal is adjusted the electrical block diagram with verification;
Fig. 7 is the structural representation of the radiodigital height indicator linear frequency modulation continuous wave calibration equipment that provides of the specific embodiment of the invention;
Fig. 8 is the integral module structural representation of the radiodigital height indicator linear frequency modulation continuous wave calibration equipment that provides of the specific embodiment of the invention.
Embodiment
The specific embodiment of the invention provides a kind of radiodigital height indicator linear frequency modulation continuous wave method of calibration, and as shown in Figure 1, this method comprises:
Concrete, as shown in Figure 2, there is microprocessor to give the da chip value in the middle of the digital circuit, da just produces a corresponding voltage value and gives vco, and vco just produces the tail microwave of a respective frequencies according to this magnitude of voltage.Here provide a linear value by microprocessor, linear frequency modulation microwave of the just corresponding generation of vco.
Concrete, as shown in Figure 3, the microwave signal that vco produces is transferred on the directional coupler, and directional coupler just can be coupled to this signal on another root lead.Directional coupler has stoped the reverse coupled of signal, has protected vco.
Concrete, as shown in Figure 4, two frequency various signals obtain the new signal of frequency for both differences after closing ripple, are exactly difference frequency like this, and this step is that the signal that directional coupler is come and the signal of local oscillator generation carry out difference frequency.
Concrete, as shown in Figure 5, in order to let the digital circuit part can collect this difference frequency, need to carry out frequency division and obtain a fractional frequency signal with a frequency divider, like this, digital circuit could be carried out signals collecting to it.
Concrete, as shown in Figure 6, with digital circuit it is gathered; Judge according to the fractional frequency signal value that collects whether the linear frequency modulation microwave that DA control VCO produces reaches requirement, thereby adjust, realize the accurate verification of VCO.This module has guaranteed the degree of accuracy of frequency modulation analog part, thereby makes the measurement of whole height indicator more reliable.
The technical scheme that adopts present embodiment to provide; Through main control chip regularly to transmitting control commands such as image capture unit, audio recording unit, positioning units; Can not participate under the situation of any operation the user; Gather user's information such as site, sound, image, realized security monitoring some specific crowds that can't operating electronic equipment.
Embodiment of the present invention also provides a kind of radiodigital height indicator linear frequency modulation continuous wave calibration equipment, and is as shown in Figure 7, comprising:
Microwave generation module 71 is used for partly controlling vco by digital circuit and produces the linear frequency modulation microwave;
Microwave coupling module 72 is used at the vco next stage through the coupling of directional coupler general who has surrendered microwave signal;
Microwave difference frequency module 73 is used for through the difference frequency device microwave signal of coupling and the signal of a local oscillator generation being carried out difference frequency;
Microwave frequency division module 74 is used for carrying out frequency division through the microwave signal that frequency divider will pass through difference frequency and obtains a fractional frequency signal;
Microwave adjusting module 75 is used for judging according to the value to the fractional frequency signal that collects whether said linear frequency modulation microwave meets the requirements, if undesirable, then adjusts accordingly.
The integral module structure of said apparatus is as shown in Figure 8, and the embodiment of the processing capacity of each module that comprises in this device is described in method embodiment before, no longer is repeated in this description at this.
The above; Be merely the preferable 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.
Claims (2)
1. a radiodigital height indicator linear frequency modulation continuous wave method of calibration is characterized in that, comprising:
Partly control vco by digital circuit and produce the linear frequency modulation microwave;
Be coupled through directional coupler general who has surrendered microwave signal at the vco next stage;
Through the difference frequency device microwave signal of coupling and the signal of a local oscillator generation are carried out difference frequency;
The microwave signal that to pass through difference frequency through frequency divider is carried out frequency division and is obtained a fractional frequency signal;
Value according to the fractional frequency signal that collects judges whether said linear frequency modulation microwave meets the requirements, if undesirable, then adjusts accordingly.
2. a radiodigital height indicator linear frequency modulation continuous wave calibration equipment is characterized in that, comprising:
The microwave generation module is used for partly controlling vco by digital circuit and produces the linear frequency modulation microwave;
The microwave coupling module is used at the vco next stage through the coupling of directional coupler general who has surrendered microwave signal;
Microwave difference frequency module is used for through the difference frequency device microwave signal of coupling and the signal of a local oscillator generation being carried out difference frequency;
The microwave frequency division module is used for carrying out frequency division through the microwave signal that frequency divider will pass through difference frequency and obtains a fractional frequency signal;
The microwave adjusting module is used for judging according to the value to the fractional frequency signal that collects whether said linear frequency modulation microwave meets the requirements, if undesirable, then adjusts accordingly.
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| CN2011101718769A CN102360071A (en) | 2011-06-23 | 2011-06-23 | Method and apparatus for verification of linear frequency modulation continuous wave of radio digital altimeter |
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| CN2011101718769A CN102360071A (en) | 2011-06-23 | 2011-06-23 | Method and apparatus for verification of linear frequency modulation continuous wave of radio digital altimeter |
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Cited By (6)
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|---|---|---|---|---|
| CN102901954A (en) * | 2012-09-04 | 2013-01-30 | 天津职业技术师范大学 | Non-linear software correction method of linear frequency modulated continuous wave radar |
| CN103235293A (en) * | 2013-03-25 | 2013-08-07 | 深圳市华儒科技有限公司 | Method and device for frequency correction |
| CN103698752A (en) * | 2012-09-27 | 2014-04-02 | 中国航天科工集团第二研究院二O七所 | Radar altimeter simulator |
| CN106289316A (en) * | 2016-07-14 | 2017-01-04 | 电子科技大学 | A kind of continuous wave radio altimeter test device |
| CN110850399A (en) * | 2019-11-19 | 2020-02-28 | 成都飞机工业集团电子科技有限公司 | Pulse type radio altimeter video target processing circuit |
| CN111025278A (en) * | 2019-12-31 | 2020-04-17 | 北京中科飞鸿科技股份有限公司 | Radio altimeter |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102901954A (en) * | 2012-09-04 | 2013-01-30 | 天津职业技术师范大学 | Non-linear software correction method of linear frequency modulated continuous wave radar |
| CN103698752A (en) * | 2012-09-27 | 2014-04-02 | 中国航天科工集团第二研究院二O七所 | Radar altimeter simulator |
| CN103698752B (en) * | 2012-09-27 | 2016-08-31 | 中国航天科工集团第二研究院二O七所 | A kind of radar altimeter simulator |
| CN103235293A (en) * | 2013-03-25 | 2013-08-07 | 深圳市华儒科技有限公司 | Method and device for frequency correction |
| CN106289316A (en) * | 2016-07-14 | 2017-01-04 | 电子科技大学 | A kind of continuous wave radio altimeter test device |
| CN106289316B (en) * | 2016-07-14 | 2018-12-18 | 电子科技大学 | A kind of continuous wave radio altimeter test device |
| CN110850399A (en) * | 2019-11-19 | 2020-02-28 | 成都飞机工业集团电子科技有限公司 | Pulse type radio altimeter video target processing circuit |
| CN110850399B (en) * | 2019-11-19 | 2023-04-18 | 成都飞机工业集团电子科技有限公司 | Pulse type radio altimeter video target processing circuit |
| CN111025278A (en) * | 2019-12-31 | 2020-04-17 | 北京中科飞鸿科技股份有限公司 | Radio altimeter |
| CN111025278B (en) * | 2019-12-31 | 2023-09-01 | 北京中科飞鸿科技股份有限公司 | Radio altimeter |
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Application publication date: 20120222 |