CN106125068A - Echo signal reception device in laser ranging - Google Patents
Echo signal reception device in laser ranging Download PDFInfo
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- CN106125068A CN106125068A CN201610585132.4A CN201610585132A CN106125068A CN 106125068 A CN106125068 A CN 106125068A CN 201610585132 A CN201610585132 A CN 201610585132A CN 106125068 A CN106125068 A CN 106125068A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/486—Receivers
- G01S7/487—Extracting wanted echo signals, e.g. pulse detection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/491—Details of non-pulse systems
- G01S7/493—Extracting wanted echo signals
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention provides echo signal reception device in a kind of laser ranging, including signal receiving end and multilevel signal acquisition channel；Signal sampling channels at different levels all include partial pressure unit and data acquisition card；Signal receiving end receives laser echo signal, and laser echo signal is converted into the signal of telecommunication, and transmitting telecommunication number gives signal sampling channels at different levels；The partial pressure unit of current demand signal acquisition channel carries out voltage division processing according to the dividing ratios that current demand signal acquisition channel is corresponding to the signal of telecommunication, inputs the signal of telecommunication after voltage division processing to data acquisition card；The signal of telecommunication of input is acquired by data acquisition card according to presetting acquisition range, and wherein, in signal sampling channels at different levels, the default acquisition range of data acquisition card is the most consistent.In the present invention, gather echo-signal by multilevel signal acquisition channel, it is possible to the dynamic range of the echo-signal that effective extension gathers, it is possible to ensure the integrity of echo signal reception, it is ensured that the distance of the target object of measurement and the accuracy of half-tone information.
Description
Technical field
The present invention relates to laser ranging technique field, in particular to echo signal reception dress in a kind of laser ranging
Put.
Background technology
Compared with other ranging technologies, laser ranging has that capacity of resisting disturbance is strong, range accuracy is high, far measuring distance etc. is all
Many advantages, it is thus achieved that extensively apply.In recent years, the three-dimensional laser scanner based on laser ranging technique, promoting shifting
The fast development in the fields such as dynamic measurement, three-dimensional live map, has very important significance in national economy and national defense construction.
The cardinal principle of laser ranging is, range-measurement system includes laser transmitting system, and laser transmitting system is to target object
Launching laser, this laser returns to range-measurement system after target object reflection (usually diffuse-reflectance), returns to swashing of range-measurement system
Light is also called echo-signal, and the flight time of the laser launched by calculating i.e. can get target object distance ranging system
Distance, meanwhile, i.e. can get the half-tone information of target object by the size of record echo-signal.
Owing to the finding range of laser ranging is the widest, the shortest can be to decimetre, farthest up to thousands of rice, and different targets
The reflectance to laser of object is different, and the Strength Changes scope of the echo-signal that therefore range-measurement system receives is very big, as returned
The minimum voltage value of ripple signal can be 10mV, and maximum voltage value can reach 100000mV, i.e. echo-signal and have wide dynamic
Scope.Range-measurement system receive echo-signal time, need ensure echo signal reception integrity, do not lose intensity too small or
The echo-signal that intensity is excessive, thus distance and the half-tone information of target object is accurately measured according to complete echo-signal.Cause
How this, adapt to the wide dynamic range of echo-signal, it is ensured that the distance of target object and the true measurement of half-tone information, be laser
One of main bugbear in range-measurement system.
In correlation technique, for adapting to the wide dynamic range of echo-signal, the device generally used has cross-polarization detection to filter
Ripple, automatic growth control, multi-channel A/D C (Analog-to-Digital Converter, A/D converter) capture card etc., but
The dynamic range that these devices can adapt to is limited, it is difficult to ensure the integrity of echo signal reception, thus according to echo-signal
The distance of the target object measured and the accuracy of half-tone information are poor.
Summary of the invention
In view of this, the purpose of the embodiment of the present invention is to provide echo signal reception device in a kind of laser ranging, with
The dynamic range that echo signal reception device in solution correlation technique can adapt to is limited, it is difficult to ensure echo signal reception
Integrity, thus the problem that the accuracy of the distance of target object measured according to echo-signal and half-tone information is poor.
First aspect, embodiments provides echo signal reception device in a kind of laser ranging, wherein, described dress
Put and include signal receiving end and multilevel signal acquisition channel；
Described signal sampling channels at different levels all include partial pressure unit and data acquisition card；
Described signal receiving end receives laser echo signal, described laser echo signal is converted into the signal of telecommunication, passes respectively
The defeated described signal of telecommunication gives described signal sampling channels at different levels；
The partial pressure unit of current demand signal acquisition channel according to dividing ratios corresponding to described current demand signal acquisition channel to institute
State the signal of telecommunication and carry out voltage division processing, the signal of telecommunication after voltage division processing is transmitted to described data acquisition card；
The signal of telecommunication received is acquired by described data acquisition card according to default acquisition range, wherein, and signals at different levels
In acquisition channel, the default acquisition range of data acquisition card is the most consistent.
In conjunction with first aspect, embodiments provide the first possible implementation of above-mentioned first aspect, its
In, preset the maximum collection value of acquisition range according to described data acquisition card correspondence and described signal receiving end allows input
Big voltage magnitude, calculates the amplification of first order signal sampling channel, and described first order signal sampling channel is multilevel signal
Either signal acquisition channel in acquisition channel；
Amplification and described data acquisition card correspondence according to described first order signal sampling channel preset acquisition range
Determine that second level signal sampling channel covers the maximum amplitude of signal；
Maximum amplitude and described data acquisition card correspondence according to described second level signal sampling channel covering signal are preset
The maximum collection value of acquisition range, calculates the amplification of described second level signal sampling channel；
Using said method, calculating the amplification of signal sampling channel at different levels, until calculating signal sampling channel
Till the big multiple in side is 1, the amplification of above-mentioned signal sampling channels at different levels is the intrinsic standoff ratio that signal sampling channel at different levels is corresponding
Example.
In conjunction with the first possible implementation of first aspect, embodiments provide the of above-mentioned first aspect
Two kinds of possible implementations, wherein, the described amplification according to described first order signal sampling channel and described signal are adopted
Truck correspondence is preset acquisition range and is determined that second level signal sampling channel covers the maximum amplitude of signal, including:
Amplification and described data acquisition card correspondence according to described first order signal sampling channel preset acquisition range
Minimum collection value, calculate described first order signal sampling channel cover signal minimum amplitude；
Amplification and described data acquisition card correspondence according to described first order signal sampling channel preset acquisition range
Maximum collection value, calculate described first order signal sampling channel cover signal maximum amplitude；
The minimum amplitude of described first order signal sampling channel covering signal is defined as described second level signals collecting lead to
Road covers the maximum amplitude of signal.
In conjunction with the first possible implementation of first aspect, embodiments provide the of above-mentioned first aspect
Three kinds of possible implementations, wherein, described according to described data acquisition card correspondence preset acquisition range maximum collection value and
Described signal receiving end allows the maximum voltage amplitude of input, calculates the amplification of first order signal sampling channel, including:
Preset the maximum collection value of acquisition range according to described data acquisition card correspondence, and described signal receiving end allows defeated
The maximum voltage amplitude entered, calculates the amplification of described first order signal sampling channel by formula (1)；
G1=S2/V (1)
Wherein, in formula (1), G1For the amplification of described first order signal sampling channel, V is that described signal receives
End allows the maximum voltage amplitude accessed, S2The maximum collection value of acquisition range is preset for described data acquisition card correspondence.
In conjunction with first aspect, embodiments provide the 4th kind of possible implementation of above-mentioned first aspect, its
In, each partial pressure unit all includes the first resistance and the second resistance；
One end of described first resistance is connected with described signal receiving end, the other end of described first resistance and described second
Resistance and described data acquisition card connect.
In conjunction with the 4th kind of possible implementation of first aspect, embodiments provide the of above-mentioned first aspect
Five kinds of possible implementations, wherein, described first resistance and described second resistor satisfied formula (2)；
Wherein, in formula (2), R2For the resistance of described second resistance, R1For the resistance of described first resistance, G is described
First resistance and dividing ratios corresponding to the second resistance place signal sampling channel.
In conjunction with the 4th kind of possible implementation of first aspect, embodiments provide the of above-mentioned first aspect
Six kinds of possible implementations, wherein, described first resistance is a resistance or multiple resistant series composition；
Described second resistance is a resistance or multiple resistant series composition.
In conjunction with first aspect, embodiments provide the 7th kind of possible implementation of above-mentioned first aspect, its
In, described signal sampling channels at different levels all include signal processing unit；
Described signal processing unit is connected with the partial pressure unit in its place signal sampling channel and data acquisition card.
In conjunction with first aspect, embodiments provide the 8th kind of possible implementation of above-mentioned first aspect, its
In, described signal receiving end includes photodetector and signal receiving element；
Described signal receiving element receives the echo-signal in laser ranging, and transmits described echo-signal to described photoelectricity
Detector, described echo-signal is converted into the signal of telecommunication by described photodetector, transmits the described signal of telecommunication to described signals at different levels
Acquisition channel.
In conjunction with first aspect, embodiments provide the 9th kind of possible implementation of above-mentioned first aspect, its
In, the data acquisition card in described signal sampling channels at different levels is all connected with host computer, is transferred to by the signal of telecommunication of collection described
Host computer.
Echo signal reception device in the laser ranging that the embodiment of the present invention provides, wherein, this device includes that signal receives
End and multilevel signal acquisition channel, gather echo-signal by multilevel signal acquisition channel, it is possible to what effective extension gathered returns
The dynamic range of ripple signal, it is possible to ensure the integrity of echo signal reception, it is ensured that the distance of the target object of measurement and ash
The accuracy of degree information.
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, preferred embodiment cited below particularly, and coordinate
Appended accompanying drawing, is described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by embodiment required use attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, and it is right to be therefore not construed as
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to this
A little accompanying drawings obtain other relevant accompanying drawings.
Fig. 1 shows the structural representation of echo signal reception device in the laser ranging that the embodiment of the present invention is provided；
Fig. 2 shows that in the laser ranging that the embodiment of the present invention is provided, the another kind of structure of echo signal reception device is shown
It is intended to.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
Middle accompanying drawing, is clearly and completely described the technical scheme in the embodiment of the present invention, it is clear that described embodiment is only
It is a part of embodiment of the present invention rather than whole embodiments.Generally real with the present invention illustrated described in accompanying drawing herein
The assembly executing example can be arranged with various different configurations and design.Therefore, below to the present invention's provided in the accompanying drawings
The detailed description of embodiment is not intended to limit the scope of claimed invention, but is merely representative of the selected reality of the present invention
Execute example.Based on embodiments of the invention, the institute that those skilled in the art are obtained on the premise of not making creative work
There are other embodiments, broadly fall into the scope of protection of the invention.
In view of in correlation technique in order to solve in LDMS, how to adapt to the wide dynamic range of echo-signal,
Ensure the distance of target object and the true measurement of half-tone information, be mostly by using cross-polarization detection filter, automatically increasing
Benefit control, multi-channel A/D C capture card etc., but the dynamic range that these devices can adapt to is limited, it is difficult to ensure that echo-signal connects
The integrity received, thus the accuracy of the distance of target object measured according to echo-signal and half-tone information is poor.Based on this,
Embodiments provide echo signal reception device in a kind of laser ranging, be described below by embodiment.
Embodiment
Embodiments provide echo signal reception device in a kind of laser ranging, as it is shown in figure 1, the present invention implements
The device that example provides includes signal receiving end 110 and multilevel signal acquisition channel 120；
Signal sampling channels 120 at different levels all include partial pressure unit 121 and data acquisition card 122；
Signal receiving end 110 receives laser echo signal, and laser echo signal is converted into the signal of telecommunication, transmits above-mentioned respectively
The signal of telecommunication gives signal sampling channels 120 at different levels；
The partial pressure unit 121 of current demand signal acquisition channel 120 is according to the dividing ratios of current demand signal acquisition channel 120 correspondence
Above-said current signal is carried out voltage division processing, the signal of telecommunication after voltage division processing is transmitted to data acquisition card 122；
The signal of telecommunication received is acquired by data acquisition card 122 according to default acquisition range, and wherein, signals at different levels are adopted
In collection passage 120, the default acquisition range of data acquisition card 122 is the most consistent.
The corresponding default acquisition range of above-mentioned data acquisition card 122 is consistent with the performance of this data acquisition card 122, the present invention
In embodiment, the corresponding acquisition range of presetting of data acquisition card 122 can be 10-250mV, it is, of course, also possible to use other to preset
The data acquisition card 122 of acquisition range, choosing of data acquisition card 122 can be configured according to actual application scenarios, this
Bright embodiment is simply introduced the process of signals collecting as a example by the data acquisition card 122 of the acquisition range of 10-250mV, this
Do not limit the concrete acquisition range of data acquisition card 122.
Data acquisition card 122 in above-mentioned signal sampling channel at different levels 120 is identical, signal sampling channels the most at different levels
In 120, the default acquisition range of data acquisition card 122 is the same.
After signal receiving end 110 receives the echo-signal of LDMS transmission, carry out this echo-signal turning
Change, this echo-signal is converted into the signal of telecommunication, and this signal of telecommunication is transmitted separately to signal sampling channel 120 at different levels.
After signal sampling channels 120 at different levels receive the signal of telecommunication of signal receiving end 110 transmission, lead to according to this signals collecting
The dividing ratios of road 120 correspondence carries out voltage division processing to this signal of telecommunication, obtains the signal of telecommunication after voltage division processing, and this signals collecting is led to
The signal of telecommunication after voltage division processing is entered by the data acquisition card 122 in road 120 according to the default acquisition range of this data acquisition card 122
Row gathers, i.e. data acquisition card 122 gathers the signal of telecommunication that this default acquisition range is corresponding, when the signal of telecommunication after voltage division processing surpasses
When crossing the default acquisition range of this data acquisition card 122, this signal sampling channel 120 obtains data acquisition card 122 and does not gathers.
In the embodiment of the present invention, the most corresponding one of signal sampling channels 120 at different levels cover range of signal, each signals collecting
Passage 120 can gather the signal covered in range of signal that this signal sampling channel is corresponding, and signal sampling channels 120 at different levels are right
The covering range of signal answered differs, and is stacked up by the covering range of signal of signal sampling channel 120 correspondences at different levels, it is determined that
Echo signal reception device receivable echo-signal dynamic range in laser ranging in the present invention.
The signal of telecommunication that signal receiving end 110 will convert into is transferred to signal sampling channel 120 at different levels simultaneously, and signals at different levels are adopted
In collection passage 120, certain grade of signal sampling channel 120 of total existence can gather this signal of telecommunication.
Echo signal reception device in the laser ranging that the embodiment of the present invention provides, including signal receiving end 110 and multistage
Signal sampling channel 120, gathers echo-signal by multilevel signal acquisition channel, it is possible to the echo-signal that effective extension gathers
Dynamic range, it is possible to ensure echo signal reception integrity, it is ensured that the distance of the target object of measurement and half-tone information
Accuracy.
Wherein, in embodiments of the present invention, according to the corresponding maximum collection value presetting acquisition range of data acquisition card 122 and
Signal receiving end 110 allows the maximum voltage amplitude of input, calculates the amplification of first order signal sampling channel, and the first order is believed
Number acquisition channel is the either signal acquisition channel in multilevel signal acquisition channel；
Amplification according to first order signal sampling channel and the corresponding acquisition range of presetting of data acquisition card 122 determine the
Second signal acquisition channel covers the maximum amplitude of signal；
Maximum amplitude and the corresponding default collection model of data acquisition card 122 of signal is covered according to second level signal sampling channel
The maximum collection value enclosed, calculates the amplification of second level signal sampling channel；
Using said method, calculating the amplification of signal sampling channel at different levels, until calculating signal sampling channel
Till amplification is 1, the amplification of above-mentioned signal sampling channels 120 at different levels is signal sampling channel 120 correspondences at different levels
Dividing ratios.
The amplification of the dividing ratios of above-mentioned signal sampling channel at different levels 120 correspondence and this signal sampling channel mutually one
Cause.
Above-mentioned first order signal sampling channel is the either signal acquisition channel in multilevel signal acquisition channel 120, above-mentioned
Second level signal sampling channel is to go out the either signal outside first order signal sampling channel in multilevel signal acquisition channel 120
Acquisition channel.
Owing in each signal sampling channel 120, the default acquisition range of data acquisition card 122 is the same, therefore, no
Data acquisition card 122 in above-mentioned each signal sampling channel 120 is made a distinction.
Wherein, the amplification of above-mentioned first order signal sampling channel 120, can be corresponding pre-according to data acquisition card 122
If the maximum collection value of acquisition range, and the maximum voltage amplitude of signal receiving end 110 permission input, calculated by formula (1)
The amplification of first order signal sampling channel；
G1=S2/V (1)
Wherein, in formula (1), G1For the amplification of first order signal sampling channel, V is that signal receiving end 110 is permitted
Permitted the maximum voltage amplitude accessed, S2For the corresponding maximum collection value presetting acquisition range of data acquisition card 122.
Above-mentioned second level signal sampling channel covers the maximum amplitude of signal, can be realized by method calculated as below, tool
Body includes: amplification and data acquisition card 122 correspondence according to described first order signal sampling channel preset acquisition range
Minimum collection value, calculates first order signal sampling channel and covers the minimum amplitude of signal；
Amplification according to first order signal sampling channel and the corresponding maximum presetting acquisition range of data acquisition card 122
Collection value, calculates first order signal sampling channel and covers the maximum amplitude of signal；
The minimum amplitude that first order signal sampling channel covers signal is defined as second level signal sampling channel covering letter
Number maximum amplitude.
In order to introduce the calculating process of dividing ratios corresponding to above-mentioned signal sampling channel at different levels in more detail, below will be with
In the laser ranging that the embodiment of the present invention provides, the dynamic range of echo signal reception device is 5 orders of magnitude, data acquisition card
Acquisition range be to calculate as a example by 10-250mV.
The dynamic range of 5 orders of magnitude, corresponding voltage magnitude is 100000mV, and therefore, signal receiving end 110 allows defeated
The maximum voltage amplitude entered is 100000mV, and the maximum collection value in the corresponding default acquisition range of data acquisition card 122 is
250mv, therefore, the amplification that can calculate first order signal sampling channel according to formula (1) is G1=250mV/
100000mV=1/400, according to amplification and the default acquisition range of data acquisition card 122 of first order signal sampling channel
Maximum collection value, by formula 250mv/G1First order signal sampling channel can be calculated and cover the maximum amplitude of signal,
Due to G1Size be 1/400, therefore can calculate first order signal sampling channel cover signal maximum amplitude be
100000mV, presets acquisition range according to the amplification of first order signal sampling channel and data acquisition card 122 are corresponding
Little collection value, by formula 10mv/G1The minimum amplitude that can calculate first order signal sampling channel covering signal is
4000mV, by first order signal sampling channel cover signal minimum amplitude 4000mV be defined as second and signal sampling channel cover
The maximum amplitude of lid signal.
Afterwards, maximum amplitude corresponding to scope and the data acquisition card of signal is covered according to second level signal sampling channel
The 122 corresponding maximum collection values presetting acquisition range, pass through G2=250Mv/4000mV=1/16, calculates second level signals collecting
Corresponding the presetting of the amplification of passage, the amplification corresponding according to second level signal sampling channel and data acquisition card 122 is adopted
The minimum collection value of collection scope, passes through 10mV/G2=160mV calculates second level signal sampling channel and covers the most small size of signal
Value, covers the second level signal sampling channel minimum amplitude of signal and is defined as third level signal sampling channel and covers signal
Amplitude, covers maximum amplitude and the corresponding default collection model of data acquisition card 122 of signal according to third level signal sampling channel
The maximum collection value enclosed, it may be determined that the amplification of third level signal sampling channel is 1.
By said method, determine when in laser ranging, the dynamic range of echo signal reception device is 5 orders of magnitude
Time, need three-level signal acquisition channel, and the amplification of three-level signal acquisition channel is respectively 1,1/16,1/400, but logical
Cross the amplification that signal sampling channels at different levels that aforesaid way determines are corresponding so that second level signal sampling channel and the 3rd
The covering signal of level signal sampling channel overlaps, and first order signal sampling channel and second level signal sampling channel
Cover signal and there is no overlap, so that the covering range of signal of first order signal sampling channel and second level signal sampling channel
There is also and partly overlap, the amplification that second level signal sampling channel is corresponding can be finely adjusted, the second level can be believed
The fine setting of number amplification that acquisition channel is corresponding is 1/20, the amplification that such three-level signal acquisition channel is corresponding is respectively 1,
1/20,1/400, and the corresponding respectively covering range of signal of three-level signal acquisition channel be 10-250mV, 200-5000mV,
4000-100000mV, i.e. amplification be the covering range of signal corresponding to signal sampling channel of 1 be 10-250mV, times magnification
Number be the covering range of signal corresponding to signal sampling channel of 1/20 be 200-5000mV, amplification be 1/400 signal adopt
Integrate covering range of signal corresponding to passage as 4000-100000mV.
The above-mentioned calculating process being merely illustrative dividing ratios corresponding to signal sampling channel at different levels, does not limit and swashs
The device that receives of ligh-ranging echo-signal can accept the dynamic range of echo-signal.
Wherein, as an embodiment, as in figure 2 it is shown, above-mentioned each partial pressure unit 121 all includes the first resistance 1211 and
Two resistance 1212；One end of first resistance 1211 is connected with signal receiving end 110, the other end of the first resistance 1211 and the second electricity
Resistance 1212 and data acquisition card 122 connect.
In embodiments of the present invention, the letter in the signal sampling channel 120 at the second resistance 1212 and this second resistance place
Number capture card 122 is in parallel, and the dividing potential drop on the second resistance 1212 and the dividing potential drop on data acquisition card 122 are equal.
In embodiments of the present invention, above-mentioned first resistance 1211 and the second resistance 1212 meet formula (2)；
Wherein, in formula (2), R2It is the resistance of the second resistance 1212, R1Being the resistance of the first resistance 1211, G is described
The dividing ratios that first resistance 1211 is corresponding with the second resistance 1212 place signal sampling channel.
The dividing ratios that above-mentioned first resistance 1211 is corresponding with the second resistance 1212 place signal sampling channel is exactly first
Resistance 1211 and the amplification of the second resistance 1212 place signal sampling channel.
Generally, the resistance of above-mentioned first resistance 1211 is unsuitable excessive, generally less than 10K Ω, the first resistance 1211
Can arbitrarily choose any resistance less than 10k Ω, according to resistance and first resistance 1211 institute of the first resistance 1211 chosen
In the amplification of signal sampling channel, the resistance of the second resistance 1212 can be calculated.
Wherein, above-mentioned first resistance 1211 can be a resistance or multiple resistant series composition；Above-mentioned second resistance
1212 can be a resistance or multiple resistant series composition.
No matter above-mentioned first resistance 1211 and the second resistance 1212 are made up of a resistance, or multiple resistant series group
Becoming, the resistance of the first resistance 1211 and the second resistance 1212 has only to meet relational expression (2), and the resistance of the first resistance 1211 is little
In 10k Ω.
Wherein, in embodiments of the present invention, signal sampling channels at different levels also include signal processing unit；
Signal processing unit is connected with the partial pressure unit 121 in described signal sampling channel and data acquisition card 122.
In embodiments of the present invention, signal sampling channels 120 at different levels are provided with signal processing unit, signal processing list
Unit is connected with the partial pressure unit 121 in this signal sampling channel and data acquisition card 122.
One end of above-mentioned signal processing unit is connected with partial pressure unit 121, and the other end is connected with data acquisition card 122, letter
Number processing unit receives the signal of telecommunication after the dividing potential drop of partial pressure unit 121 transmission, is amplified this signal of telecommunication, Filtering Processing, and
It, to data acquisition card 122, is acquired by the signal of telecommunication after transmission process by data acquisition card.
Wherein, as an embodiment, above-mentioned signal receiving end 110 includes photodetector and signal receiving element；
Signal receiving element receives the echo-signal in laser ranging, and transmits above-mentioned echo-signal to photodetector,
Above-mentioned echo-signal is converted into the signal of telecommunication by photodetector, and transmission above-said current signal gives signal sampling channels at different levels.
Wherein, the data acquisition card 122 in above-mentioned signal sampling channels 120 at different levels is all connected with host computer, by gather
The signal of telecommunication is transferred to host computer.
Data acquisition card 122 can be wired with host computer, it is also possible to wireless connections, and wireless connections can pass through network
Connecting and realize, it can be the connection of WI-FI (Wireless-Fidelity, Wireless Fidelity) network, 3G (3rd-that this network connects
Generation, G mobile communication) network connects or 4G (the 4Generation mobile
Communication technology, forth generation mobile communication technology) network connection.
Above-mentioned host computer can be mobile phone, computer, PAD (portable android device, panel computer) etc..
The signal of telecommunication transmission that this data acquisition card 122 is gathered by the data acquisition card 122 in signal sampling channels 120 at different levels
To host computer, host computer obtain distance and the half-tone information etc. of target object according to this signal of telecommunication.
The reception device of echo-signal in the laser ranging that the embodiment of the present invention provides, including signal receiving end and multistage letter
Number acquisition channel, gathers echo-signal by multilevel signal acquisition channel, it is possible to the echo-signal that effective extension gathers dynamic
State scope, it is possible to ensure the integrity of echo signal reception, it is ensured that the distance of the target object of measurement and the standard of half-tone information
Really property.
It should also be noted that similar label and letter represent similar terms, therefore, the most a certain Xiang Yi in following accompanying drawing
Individual accompanying drawing is defined, then need not it be defined further and explains in accompanying drawing subsequently.
In describing the invention, it should be noted that term " " center ", " on ", D score, "left", "right", " vertically ",
Orientation or the position relationship of the instruction such as " level ", " interior ", " outward " they are based on orientation shown in the drawings or position relationship, or this
The orientation usually put or position relationship when bright product uses, be for only for ease of the description present invention and simplifying describe rather than
Instruction or hint indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore can not
It is interpreted as limitation of the present invention.Describe additionally, term " first ", " second ", " the 3rd " etc. are only used for distinguishing, and be not understood that
For instruction or hint relative importance.
In describing the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " arrange ",
" install ", " being connected ", " connection " should be interpreted broadly, and connect for example, it may be fixing, it is also possible to be to removably connect, or one
Body ground connects；Can be to be mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to indirect by intermediary
It is connected, can be the connection of two element internals.For the ordinary skill in the art, can be with in concrete condition understanding
State term concrete meaning in the present invention.
It is last it is noted that the detailed description of the invention of embodiment described above, the only present invention, in order to the present invention to be described
Technical scheme, be not intended to limit, protection scope of the present invention is not limited thereto, although with reference to previous embodiment to this
Bright it is described in detail, it will be understood by those within the art that: any those familiar with the art
In the technical scope that the invention discloses, the technical scheme described in previous embodiment still can be modified or can be light by it
It is readily conceivable that change, or wherein portion of techniques feature is carried out equivalent；And these are revised, change or replace, do not make corresponding
The essence of technical scheme departs from the spirit and scope of embodiment of the present invention technical scheme.All should contain in protection scope of the present invention
Within.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (10)
1. echo signal reception device in laser ranging, it is characterised in that described device includes signal receiving end and multilevel signal
Acquisition channel；
Described signal sampling channels at different levels all include partial pressure unit and data acquisition card；
Described signal receiving end receives laser echo signal, described laser echo signal is converted into the signal of telecommunication, transmits institute respectively
State the signal of telecommunication to described signal sampling channels at different levels；
The partial pressure unit of current demand signal acquisition channel according to dividing ratios corresponding to described current demand signal acquisition channel to described electricity
Signal carries out voltage division processing, transmits the signal of telecommunication after voltage division processing to described data acquisition card；
The signal of telecommunication received is acquired by described data acquisition card according to default acquisition range, wherein, and signals collecting at different levels
In passage, the default acquisition range of data acquisition card is the most consistent.
Device the most according to claim 1, it is characterised in that preset acquisition range according to described data acquisition card correspondence
Maximum collection value and described signal receiving end allow the maximum voltage amplitude of input, calculate the amplification of first order signal sampling channel
Multiple, described first order signal sampling channel is the either signal acquisition channel in multilevel signal acquisition channel；
Amplification and described data acquisition card correspondence according to described first order signal sampling channel are preset acquisition range and are determined
Second level signal sampling channel covers the maximum amplitude of signal；
Maximum amplitude and the default collection of described data acquisition card correspondence of signal is covered according to described second level signal sampling channel
The maximum collection value of scope, calculates the amplification of described second level signal sampling channel；
Using said method, calculating the amplification of signal sampling channel at different levels, until calculating the amplification of signal sampling channel
Till multiple is 1, the amplification of above-mentioned signal sampling channels at different levels is the dividing ratios that signal sampling channel at different levels is corresponding.
Device the most according to claim 2, it is characterised in that the described amplification according to described first order signal sampling channel
Multiple and described data acquisition card correspondence are preset acquisition range and are determined that second level signal sampling channel covers the maximum amplitude of signal,
Including:
Amplification according to described first order signal sampling channel and described data acquisition card correspondence preset acquisition range
Little collection value, calculates described first order signal sampling channel and covers the minimum amplitude of signal；
Amplification according to described first order signal sampling channel and described data acquisition card correspondence preset acquisition range
Big collection value, calculates described first order signal sampling channel and covers the maximum amplitude of signal；
The minimum amplitude of described first order signal sampling channel covering signal is defined as described second level signal sampling channel cover
The maximum amplitude of lid signal.
Device the most according to claim 2, it is characterised in that described presetting according to described data acquisition card correspondence gathers model
The maximum collection value enclosed and described signal receiving end allow the maximum voltage amplitude of input, calculate first order signal sampling channel
Amplification, including:
Preset the maximum collection value of acquisition range according to described data acquisition card correspondence, and described signal receiving end allows input
Maximum voltage amplitude, calculates the amplification of described first order signal sampling channel by formula (1)；
G1=S2/V (1)
Wherein, in formula (1), G1For the amplification of described first order signal sampling channel, V is that described signal receiving end is permitted
Permitted the maximum voltage amplitude accessed, S2The maximum collection value of acquisition range is preset for described data acquisition card correspondence.
Device the most according to claim 1, it is characterised in that each partial pressure unit all includes the first resistance and the second resistance；
One end of described first resistance is connected with described signal receiving end, the other end of described first resistance and described second resistance
And described data acquisition card connects.
Device the most according to claim 5, it is characterised in that described first resistance and described second resistor satisfied formula
(2)；
Wherein, in formula (2), R2For the resistance of described second resistance, R1For the resistance of described first resistance, G is described first
Resistance and dividing ratios corresponding to the second resistance place signal sampling channel.
Device the most according to claim 5, it is characterised in that described first resistance is a resistance or multiple resistance string
Joint group becomes；
Described second resistance is a resistance or multiple resistant series composition.
Device the most according to claim 1, it is characterised in that described signal sampling channels at different levels all include signal processing list
Unit；
Described signal processing unit is connected with the partial pressure unit in its place signal sampling channel and data acquisition card.
Device the most according to claim 1, it is characterised in that described signal receiving end includes that photodetector and signal connect
Receive element；
Described signal receiving element receives the echo-signal in laser ranging, and transmits described echo-signal to described photodetection
Device, described echo-signal is converted into the signal of telecommunication by described photodetector, transmits the described signal of telecommunication to described signals collecting at different levels
Passage.
Device the most according to claim 1, it is characterised in that the data acquisition card in described signal sampling channels at different levels
All it is connected with host computer, the signal of telecommunication of collection is transferred to described host computer.
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| CN201610585132.4A CN106125068B (en) | 2016-07-22 | 2016-07-22 | Echo signal reception device in laser ranging |
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| CN113075673A (en) * | 2021-03-22 | 2021-07-06 | 深圳市德明新微电子有限公司 | Distance measuring sensor and distance measuring method |
| CN113514817A (en) * | 2020-04-09 | 2021-10-19 | 武汉海达数云技术有限公司 | Ultra-high dynamic range laser pulse signal detection processing circuit structure |
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| CN106125068B (en) | 2018-11-23 |
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