CN104977589A - High-precision and large-bandwidth laser ranging device and method for improving precision and bandwidth of laser ranging - Google Patents
High-precision and large-bandwidth laser ranging device and method for improving precision and bandwidth of laser ranging Download PDFInfo
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- CN104977589A CN104977589A CN201510337644.4A CN201510337644A CN104977589A CN 104977589 A CN104977589 A CN 104977589A CN 201510337644 A CN201510337644 A CN 201510337644A CN 104977589 A CN104977589 A CN 104977589A
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- frequency
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- laser ranging
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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
- 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
- G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S17/34—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
Abstract
The invention belongs to the technical field of laser ranging, and especially relates to a method for improving the precision and bandwidth of laser ranging, comprising a phase-locked circuit, a frequency mixing circuit and a control circuit. The method comprises the following steps: the phase-locked circuit emits a high-frequency signal and a low-frequency signal to the frequency mixing circuit, wherein the phase difference between the two signals is unchanged or the same; the frequency mixing circuit receives the two signals and outputs an invariant-phase high-frequency modulation signal after frequency mixing, and the high-frequency modulation signal is used as a reference signal; and the control circuit receives a signal generated by reflected light, and compares the signal with the reference signal to obtain the phase difference. The problem that the frequency bandwidth of a transmitting circuit in a range finder is large can be solved, balanced frequency modulation signals can be better provided for a laser emitter, and high modulation depth can be obtained for different frequencies.
Description
Technical field
The invention belongs to laser ranging technique field, particularly relate to a kind of high precision large bandwidth laser ranging system, and improve the method for precision of laser ranging and bandwidth
Background technology
Laser range finder utilizes laser to carry out the instrument of Accurate Determining (also known as laser ranging) to the distance of target.Laser range finder is operationally to a branch of very thin laser of target injection, and the laser beam reflected by photovalve receiving target, timer measures laser beam from the time being transmitted into reception, calculates from observer's range-to-go.
Laser range finder is generally adopted and is carried out measuring distance in two ways: impulse method and phase method.The process of impulse method range finding is such: the laser that stadimeter is launched is received by stadimeter again after the reflection of object being measured, the stadimeter time that recording laser is round simultaneously.The half of the product of the light velocity and two-way time is exactly the distance between stadimeter and object being measured.The precision of impulse method measuring distance is generally +/-about 1 meter.In addition, the measurement blind area of this type of stadimeter is generally about 15 meters.
Laser ranging is a kind of distance measuring method in light wave range finding, if light is propagated at A, B point-to-point transmission round trip required time for t in atmosphere with speed c, then A, B distance between two points D can represent with following:
D＝ct/2
In formula: D-survey station point A, B distance between two points; C---speed; T-light comes and goes A, B once required time.
From above formula, measure A, B distance and be actually the time t that will measure light and propagate, according to the difference of Measuring Time method, laser range finder can be divided into pulsed and phase type two kinds of measurement forms usually.
Phase laser distance measurement is generally applied in precise distance measurement.Because its precision is high, be generally grade, in order to effective reflected signal, and on a certain specified point target of mensuration being limited in match with accuracy of instrument, this stadimeter be all configured with to the catoptron being called as cooperative target.
If the frequency of modulate emission light is ω, the phase delay that round trip produces on distance D to be measured is
then corresponding time t can be expressed as:
In laser ranging technique field, usually need multiple frequency with improve measure precision and range, such as to measure the distance of 200 meters, the phase delay making it produce is 1, so the computing formula of frequency is: D=c/ (ω * 2), so its survey frequency needs at about 0.75M, but after range is large, the precision measured cannot be ensured again, as will precision be improved, then need larger frequencies omega, will in the frequency of more than 80M, the most high frequency of distance mearuring equipment and lowest frequency can be caused like this to differ tens times or more, like this in the circuit design measured, the balance that this frequency differed greatly is difficult to realize each frequency is amplified, high frequency will be ensured like this, but low frequency signal may be imperfect, and ensure that low frequency is surveyed high frequency and may do not had larger gain.
Summary of the invention
For problems of the prior art, the object of this invention is to provide a kind of high precision large bandwidth laser ranging system, high frequency modulated on low frequency, allows all frequencies all become high-frequency signal by the circuit of employing mixing.
Another object of the present invention is to provide a kind of method improving precision of laser ranging and bandwidth, and in solution laser range finder, radiating circuit medium frequency band is roomy leads the low problem of precision, allows frequency can obtain higher depth of modulation when ensureing precision.
The present invention is achieved by the following technical solutions:
There is provided a kind of high precision large bandwidth laser ranging system, comprise governor circuit, governor circuit comprises phase lock circuitry, mixting circuit and control circuit.But two paths of signals that phase differential constant or identical different by phase lock circuitry fractional transmission two-way frequency, i.e. a road high-frequency signal and a road low frequency signal.Two paths of signals is input in mixting circuit simultaneously, exports the high-frequency modulation signal of a road phase invariant after Frequency mixing processing, using high-frequency modulation signal as reference signal; Control circuit, for receiving the signal of the receiving end of reflected light generation, carries out contrast with reference signal and obtains phase differential.
As long as amplify the signal of high frequency (CLK2), too much need not pay close attention to the design of low frequency (CLK1) amplifying circuit, the frequency of the signal after modulation is the low frequency signal of CLK1, and is the signal that phase place and frequency stabilization can not change.
The devices such as the realization of mixting circuit can adopt mixing integrated chip, also can use triode, tetrode realize.In the main case of above-described technology, described mixting circuit comprises two resistance R4, R3 and bipolar transistor; Two paths of signals flows into bipolar transistor respectively by resistance R4, R3 and is mixed into a road signal.
Further, the amplifying circuit that high-frequency modulation signal signal is amplified also is included.
The present invention also provides a kind of method improving precision of laser ranging and bandwidth, includes governor circuit, and described governor circuit comprises phase lock circuitry, mixting circuit and control circuit, and the method comprises the steps:
Phase lock circuitry transmitting high-frequency and low-frequency two paths of signals are to mixting circuit, but the phase differential of two paths of signals is constant or identical;
Mixting circuit receives two paths of signals, exports the high-frequency modulation signal of a road phase invariant, using high-frequency modulation signal as reference signal after Frequency mixing processing;
Control circuit receives the signal that reflected light produces, and carries out contrast obtain phase differential with reference signal.
Technical scheme of the present invention, its technique effect is, can solve the problem that in stadimeter, radiating circuit medium frequency band is roomy, more preferably can provide balanced frequency modulated signal by generating laser, allow different frequencies can obtain higher depth of modulation.
Accompanying drawing explanation
Fig. 1 is the structural principle block diagram of the distance measuring equipment in embodiment.
Fig. 2 is the circuit theory diagrams of the distance measuring equipment in embodiment.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical scheme of the present invention is elaborated.
With reference to shown in accompanying drawing, the high precision large bandwidth laser ranging system of the present embodiment, its governor circuit comprises phase lock circuitry, mixting circuit, control circuit and amplifying circuit.
Phase lock circuitry forms primarily of phase-locked loop PLL, when the laser transmitter projects laser of laser ranging, send by PLL two-way clock signal clk 1, the CLK2 that two-way phase differential is identical, frequency is different, wherein CLK1 is high-frequency clock signal, and CLK2 is low-frequency clock signal simultaneously.
Mixting circuit comprises two resistance R4, R3 and bipolar transistor Q2, clock signal clk 1 flows into the G1 end of bipolar transistor after resistance R4, clock signal clk 1 flows into the G1 end of bipolar transistor after resistance R4, and D end is as signal output part, and S holds ground connection.Bipolar transistor is equivalent to two transistor series, by the nonlinear interaction of transistor after reception two paths of signals, two paths of signals is mixed into a road signal, exports the high-frequency modulation signal of a road phase invariant after Frequency mixing processing, using high-frequency modulation signal as reference signal;
As shown in the figure, the CLK2 signal madulation of relative high frequency on the CLK1 signal of rather low-frequency, is obtained a road clock signal of CLK1 and CLK2 frequency spectrum to signal by phase lock circuitry.Because the signal frequency of the receiving end of stadimeter is not modulated, only have the CLK1 of rather low-frequency to have difference frequency, as 10KHZ, the CLK2 of relative high frequency also can have difference frequency with local oscillator, but frequency phase-difference is very large.Just can by the difference frequency in signal and all filterings frequently by frequency wave circuit, finally we obtain the difference frequency of rather low-frequency and local oscillation signal, just the phase differential of measurement can be calculated by this signal, so just, the problem that in stadimeter, radiating circuit medium frequency band is roomy can be solved, more preferably can provide balanced frequency modulated signal by generating laser, allow different frequencies can obtain higher depth of modulation.
High-frequency modulation signal after mixing enters into amplifying circuit and amplifies, amplifying circuit as shown in the figure, comprise resistance R1, resistance R2, triode Q1, inductor L1 and capacitor C2, the base stage of triode is connected to the D end of bipolar transistor Q2 by resistance R1, resistance R2 and capacitor C2 connect and in parallel with inductor L1 after, on the collector being connected to triode or emitter.
Above embodiment is the preferred embodiments of the present invention; the invention is not restricted to above-described embodiment; for those of ordinary skills; the any apparent change that the basis not deviating from the technology of the present invention principle is done, all belongs to the protection domain of design of the present invention and claims.
Claims (5)
1. a high precision large bandwidth laser ranging system, includes governor circuit, it is characterized in that, described governor circuit comprises phase lock circuitry, mixting circuit and control circuit;
Phase lock circuitry is for launching high-frequency and low-frequency two paths of signals to mixting circuit, but the phase differential of two paths of signals is constant or identical;
Mixting circuit, for receiving two paths of signals, exports the high-frequency modulation signal of a road phase invariant, using high-frequency modulation signal as reference signal after Frequency mixing processing;
Control circuit, for receiving the signal of the receiving end of reflected light generation, carries out contrast with reference signal and obtains phase differential.
2. high precision large bandwidth laser ranging system according to claim 1, is characterized in that, described mixting circuit comprises two resistance R4, R3 and bipolar transistor; Two paths of signals flows into bipolar transistor respectively by resistance R4, R3 and is mixed into a road signal.
3. high precision large bandwidth laser ranging system according to claim 1, is characterized in that, also include amplifying circuit, amplify high-frequency modulation signal signal.
4. improve a method for precision of laser ranging and bandwidth, based on high precision large bandwidth laser ranging system according to claim 1, include governor circuit, described governor circuit comprises phase lock circuitry, mixting circuit and control circuit, and the method comprises the steps:
Phase lock circuitry transmitting high-frequency and low-frequency two paths of signals are to mixting circuit, but the phase differential of two paths of signals is constant or identical;
Mixting circuit receives two paths of signals, exports the high-frequency modulation signal of a road phase invariant, using high-frequency modulation signal as reference signal after Frequency mixing processing;
Control circuit receives the signal that reflected light produces, and carries out contrast obtain phase differential with reference signal.
5. improve the method for precision of laser ranging and bandwidth according to claim 4, it is characterized in that, described mixting circuit comprises G1, G2 of two resistance R4, R3 and bipolar transistor; Two paths of signals flows into bipolar transistor respectively by resistance R4, R3 and is mixed into a road signal.
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| CN201510337644.4A CN104977589A (en) | 2015-06-17 | 2015-06-17 | High-precision and large-bandwidth laser ranging device and method for improving precision and bandwidth of laser ranging |
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| CN201510337644.4A CN104977589A (en) | 2015-06-17 | 2015-06-17 | High-precision and large-bandwidth laser ranging device and method for improving precision and bandwidth of laser ranging |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107678021A (en) * | 2017-09-26 | 2018-02-09 | 南京索尔维电子科技有限公司 | A kind of synchronous radio beat frequency phase range unit and method |
| CN108828615A (en) * | 2018-06-11 | 2018-11-16 | 深圳市镭神智能系统有限公司 | Light emitting unit, optical signal detecting module, optical system and laser radar system |
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| US5329467A (en) * | 1990-03-30 | 1994-07-12 | Nkk Corporation | Distance measuring method and apparatus therefor |
| CN102393522A (en) * | 2011-10-24 | 2012-03-28 | 陆建生 | Measuring method of laser range finder and laser range finding apparatus |
| CN102901970A (en) * | 2012-11-08 | 2013-01-30 | 天津理工大学 | Single-modulation continuous wave laser ranging device and method |
| CN103226200A (en) * | 2013-03-22 | 2013-07-31 | 浙江理工大学 | Handheld laser ranging device |
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2015
- 2015-06-17 CN CN201510337644.4A patent/CN104977589A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5329467A (en) * | 1990-03-30 | 1994-07-12 | Nkk Corporation | Distance measuring method and apparatus therefor |
| CN102393522A (en) * | 2011-10-24 | 2012-03-28 | 陆建生 | Measuring method of laser range finder and laser range finding apparatus |
| CN102901970A (en) * | 2012-11-08 | 2013-01-30 | 天津理工大学 | Single-modulation continuous wave laser ranging device and method |
| CN103226200A (en) * | 2013-03-22 | 2013-07-31 | 浙江理工大学 | Handheld laser ranging device |
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| 耿新照: "《高频、通信电子线路实验指导》", 30 April 2015 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107678021A (en) * | 2017-09-26 | 2018-02-09 | 南京索尔维电子科技有限公司 | A kind of synchronous radio beat frequency phase range unit and method |
| CN107678021B (en) * | 2017-09-26 | 2021-09-24 | 南京索尔维电子科技有限公司 | Synchronous wireless difference frequency phase ranging device and method |
| CN108828615A (en) * | 2018-06-11 | 2018-11-16 | 深圳市镭神智能系统有限公司 | Light emitting unit, optical signal detecting module, optical system and laser radar system |
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Application publication date: 20151014 |