WO2016200293A1 - Procédé et dispositif optique pour déterminer une distance jusqu'à un objet - Google Patents

Procédé et dispositif optique pour déterminer une distance jusqu'à un objet Download PDF

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Publication number
WO2016200293A1
WO2016200293A1 PCT/RU2016/050016 RU2016050016W WO2016200293A1 WO 2016200293 A1 WO2016200293 A1 WO 2016200293A1 RU 2016050016 W RU2016050016 W RU 2016050016W WO 2016200293 A1 WO2016200293 A1 WO 2016200293A1
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signal
reflected
input
output
cascade
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Russian (ru)
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Владимир Владиславович ИМШЕНЕЦКИЙ
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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

Definitions

  • This group of inventions relates to the field of measuring distances to an object using electromagnetic waves, and more particularly to optical devices, methods for determining distances to an object when a clock signal is generated, modulation of the specified clock signal is generated, a modulated binary optical signal is emitted to the object, and received by a photosensitive element the reflected optical signal from the object, the received reflected signal is converted from analog to digital, the correlation is calculated radiated on and reflected signals, calculate the distance to the object is determined from the time delay of the reflected signal.
  • the invention can be used, for example, in a laser location.
  • CMOS complementary metal-oxide-semiconductor structure
  • English CMOS complementary metal-oxide-semiconductor
  • CMOS circuits have high speed and low power consumption.
  • LADAR a laser locator
  • laser radar an abbreviation for the Russian or English version of the "laser radar", where the radar from the English.
  • radar radio detection and ranging
  • LIDAR Light Identification Detection and Ranging - light detection and ranging
  • Lidar as a device is, at a minimum, an active optical range finder. Usually in Russia, such devices are called laser rangefinders.
  • Pseudo-random (pseudo-noise) sequences are completely deterministic digital sequences that they seem random to the outside observer.
  • Signal multiplexing - channel multiplexing i.e. transmission of several data signal streams on one channel.
  • VKF is a cross-correlation function.
  • Rxy (r) ⁇ x (t) y (t - r) dt, where [0, ⁇ ] is the integration interval, and
  • the duration of the reference signal y (t), as a rule, is significantly less than T.
  • N p n -1
  • the present invention relates to a method for determining distances to an object.
  • the distance to objects is measured by sending an optical signal, for example, laser radiation, receiving a reflected signal, determining the delay time and calculating the distance from it.
  • an optical signal for example, laser radiation
  • a method for determining distances to an object from a time delay is described, that is, determining a distance from an incoherent radiation source to a receiving matrix cell based on measuring the propagation time of an emitted pulse of incoherent radiation of a fixed duration T 0 , while the pulse is emitted periodically.
  • the receiving matrix and the emitter are located nearby.
  • the measurement method is based on the fact that the exact distance to the object’s surface is defined as the transit time of the emitted pulse to the surface and the pulse reflected from it to the cells of the receiving matrix (referred to as TOF - time of flight in foreign patent literature), multiplied by C / 2 (C - propagation velocity of electromagnetic radiation).
  • the cell (pixel) of the receiving matrix contains one element generating photocurrent (photo gate) and two structures (CMOS / MIS) capable of accumulating, holding and removing charge Q.
  • the photos are transmitted via transfer gate 1 to the charge storage device Qi, and during the period of time [ ⁇ - ⁇ + ⁇ 0 , ⁇ + 2 * To] enters through transfer gate 2 to the charge storage device Q 2 .
  • the charge stores act as integrators of the photocurrent on the To segments. Draining gates are used to quickly remove accumulated charges of Qi and Q 2 .
  • the values of the accumulated charges Qi and Q 2 are used to determine dt by the following calculation:
  • This method is used to determine the distance to the surface of objects in those cases when ⁇ - ⁇ is less than or at least several times commensurate in order with That magnitude.
  • this method is referred to as Time-Dependent Charge Detection *, which can be translated as determining charge dependent from time of flight (TOF).
  • TOF time of flight
  • a probing optical signal (impulse) of duration To is emitted to the object (see figure 1, graph A).
  • the signal reflected from the object is delayed by the time Ti + dt. (See figure 1, graph D). The following method is used to determine dt.
  • the photocurrent is fed to integrator A. (See figure 2).
  • integrator A On the trailing edge of the TX1 strobe (see Figure 1, graph B), a discrete readout Qi is read.
  • the value is reset to the integrator A (See figure 2).
  • the change in the signal at the output of the integrator A is shown in graph D of figure 1.
  • the photocurrent is supplied to integrator B (See figure 2).
  • integrator B On the trailing edge of the TX2 strobe, a discrete sample Q 2 is read, then, using the key S 2 , the value on the integrator B is reset to zero (See figure 2). The change in the signal at the output of the integrator B is shown in graph E of figure 1.
  • the delay of the reflected received signal relative to the probe is defined as
  • the accumulation method is also used - multiple sounding of the target. Incoherent accumulation allows, subject to the statistical independence of the noise component in the received signal, to increase the signal-to-noise ratio by a factor of N. N is the number of soundings in the series (accumulation volume).
  • an example of a similar method for determining the range can be, for example, the method described in RF patent N ° 2359228, published in 2009 or in international patent application WO / 2005/006016 published in 2005.
  • This method is the closest in technical essence and the achieved technical result and is selected for the prototype of the invention as a method.
  • the disadvantage of this prototype is that to increase the accuracy of determining the distance to the object, by finding the temporary position of the maximum cross-correlation, an increased frequency of quantization of time into discrete is used, equal to M / T 0 , where That is the time interval of one position in the sequence of maximum length. This leads to a significant increase in energy consumption.
  • the disadvantages of the prototype are the redundancy of calculations, so to calculate a single correlation reference for the initial rough determination of the range it is necessary to perform N addition operations. In addition, additional calculations are required to accurately determine the position of the correlation peak.
  • Another disadvantage is that the method described in the prototype has a limited range of amplitude ratios of received signals, because if two or more reflected signals are received, then you can distinguish them after correlation processing only if the ratio of the amplitudes of the received signals is more than ⁇ 2 * ⁇ / ⁇ since it is limited by the level of the side lobes of the FCF between the pseudo-noise binary signal (for example, the M-sequence) in the alphabet ⁇ 0,1 ⁇ of the same signal in the alphabet ⁇ -1, 1 ⁇ -
  • the present invention mainly aims to propose a method for determining distances to an object, allowing at least to smooth out at least one of the above disadvantages, namely: increasing the dynamic range by reflected signals from objects and reducing power consumption of the device by reducing the load on the computing modules, which is the technical task.
  • the method further comprises the following steps, in which:
  • the number of delay clocks in all digital delay lines used in the cascade computer in each of the cascades should be increased M times.
  • the signals in the cascade calculator are supplied through the multiplexer. This allows us to simplify processing and reduce the amount of memory used for computing, as well as increase the threshold threshold and dynamic range in terms of the amplitudes of the reflected signals from objects.
  • the set of essential features of the invention as a method is unknown from the prior art for methods of similar purpose, which allows us to conclude that the criterion of "novelty" for the invention.
  • the set of essential features of the invention, as a method is not obvious to a specialist, which allows us to conclude that the criterion of "inventive step" for the invention.
  • Another side of the present invention relates to an optical device for determining distances to an object.
  • the first output of the module for calculating the correlation of the emitted and reflected signals is connected to the input of the module for calculating the distance to the detected object by the time delay of the reflected signal, the first output of which is connected to the second input of the modulation generator, and the second output of which is connected to the second input of the module for calculating the correlation of reflected and reflected signals • the second output of the modulation generator is connected to the third input of the module for calculating the correlation of the emitted and reflected signals.
  • This device is the closest in technical essence and the achieved technical result and is selected as a prototype of the invention as a device.
  • the disadvantage of this prototype is that to increase the accuracy of determining the distance to the object, by finding the temporary position of the maximum cross-correlation, an increased frequency of quantization of time into discrete is used, equal to M / T 0 , where T 0 is the time interval of one position in the sequence of maximum length. This leads to a significant increase in energy consumption.
  • the disadvantages of the prototype are the redundancy of calculations, so to calculate a single correlation reference for the initial rough determination of the range it is necessary to perform N addition operations. In addition, additional calculations are required to accurately determine the position of the correlation peak.
  • the device described in the prototype has a limited range of the ratio of the amplitudes of the received signals, since if the device receives two or more reflected signals, then they can be distinguished after correlation processing only if the ratio of the amplitudes of the received signals is more than ⁇ 2 * ⁇ / ⁇ since limited by the level of the side lobes of the VKF between the pseudo-noise binary signal (for example, the M-sequence) in the alphabet ⁇ 0,1 ⁇ and the same signal in the alphabet ⁇ -1, 1 ⁇ . Disclosure of the invention as a device.
  • the present invention mainly aims to provide an optical device for determining distances to an object, which allows at least smoothing out at least one of the above disadvantages, namely, to increase the dynamic range by reflected signals from objects and reducing the power consumption of the device by reducing the load on the computing modules, which is the technical task.
  • the modulation generator is made in the form of a generator of at least one pseudo-noise sequence, matched with a cascade computer, the computer configured to calculate the cross-correlation function of the emitted and received signals.
  • the output of the photosensitive element for detecting the reflected optical signal from the object is connected to the input of the integration module, the output of which is connected to the first input of the module for calculating the correlation of the emitted and reflected signals.
  • the module for calculating the correlation of the emitted and reflected signals further comprises a series-connected multiplexer and a cascade computer.
  • the number of delay clocks in all digital delay lines used in the cascade computer in each of the cascades should be increased M times.
  • the signals in the cascade calculator are supplied through the multiplexer. This simplifies processing and reduces the amount of memory used for computing.
  • the module for calculating the correlation of the emitted and reflected signals further comprises a first storage unit, the input of which is connected to the output of the cascade computer.
  • the module for calculating the correlation of the emitted and reflected signals further comprises a second storage unit, the output of which is connected to the input of the cascade computer, and the input of which is connected to the output of the multiplexer.
  • the module for calculating the correlation of the emitted and reflected signals further comprises a demultiplexer, the input of which is connected to the output of the first storage unit.
  • the modulation generator is made in the form of a generator of two additional pseudo-noise sequences, matched with a cascade computer.
  • the modulation generator is made in the form of a generator of additional pseudo-noise sequences, the number of which is a multiple of two, matched with a cascade computer.
  • the photosensitive element for detecting the reflected optical signal is located on a gyro-stabilized platform.
  • the photosensitive element for detecting the reflected optical signal has a polarizing filter located in front of the input of the optical signal to the photosensitive element.
  • FIG. 1 depicts time charts explaining the method of determining the distance implemented by the prior art
  • FIG. 2 depicts the unit of integration of the signal at time intervals T 0 and the formation of discrete samples Q, according to the prior art
  • FIG. 3 depicts a functional diagram of an optical device for determining distances to an object according to the invention
  • FIG. 4 depicts a device for generating codes d 0 , d :
  • FIG. 5 depicts a device for generating codes d 2 o, d 2 -i, d 2 2, d 2 3,
  • figure 6 depicts a diagram of the cascade 2 of the cascade computer displayed in figure 7,
  • FIG. 7 depicts a device generating two additional D-sequences
  • FIG. 8 depicts a cascade calculator VKF circuit allowing, using a cascade calculator to calculate the four specified in table 3 VKF for their subsequent summation.
  • FIG. 9 depicts a diagram of a cascade computer, consisting of nine cascades
  • FIG. 11 depicts a cascade diagram obtained by permutation and connections between cascades
  • FIG. 13 depicts graphs ⁇ , ⁇ , ⁇ , ⁇ on which the emitted signals are reflected modulated by sequences K1, K2, KZ, K4, and the same signals reflected from the object (graphs B, G, L, P), the process of integrating the received signals into time intervals of duration T 0 (graphs G, 3, M, P), discrete samples obtained as a result of integration on the intervals are reflected in graphs D, I, H, C, respectively. On the graph And displays the clock and their numbers supplied to the modulation generator, shown in figure 3.
  • the optical device for determining distances to the object includes a radiation source 1 to the object of a modulated binary optical signal, the input of which is connected to the first output of the modulation generator 2, the first input of which is connected to the output of the clock signal generator 3.
  • the optical device for determining the distances to the object also includes a photosensitive element 4 for detecting the reflected optical signal from the object 5, the output of which is connected to the first input of the correlation calculation module 6 of the emitted and reflected signals containing the analog-to-digital converter 7.
  • the first output of the calculation module 6 the correlation of the emitted and reflected signals is connected to the input of the module 8 for calculating the distance to the detected object by the time delay of the reflected signal.
  • the first output of module 8 is connected to the second input of the modulation generator 2, and the second output of generator 2 is connected to the second input of the module 6 for calculating the correlation of the emitted and reflected signals.
  • the second output of module 8 is connected to the third input of the module for calculating the correlation of the emitted and reflected signals.
  • the modulation generating generator 2 is made in the form of a generator of at least one pseudo-noise sequence matched with a cascade computer 9.
  • the output of the photosensitive element for detecting the reflected optical signal from the object is connected to the input of the integration module 10, the output of which is connected to the first input of the correlation calculation module 6 emitted and reflected signals.
  • the module 6 for calculating the correlation of the emitted and reflected signals additionally contains a series-connected multiplexer 11 and a cascade calculator 9. (Modules 7 and 11 can be interchanged if the analog signal is multiplexed and a high-speed ADC is used).
  • the module 6 for calculating the correlation of the emitted and reflected signals may additionally contain a first storage unit 12, the output of which is connected to the input of the cascade computer VKF 9 (an example of the circuit of the cascade computer VKF is shown in Fig. 8), and the input of which is connected to the output of the multiplexer 11.
  • the module for calculating the correlation of the emitted and reflected signals may further comprise a second storage unit 13, the input of which is connected to the output of the cascade computer.
  • Module 6 for calculating the correlation of the emitted and reflected signals may additionally contain a demultiplexer 14, the input of which is connected to the output of the first storage unit 12.
  • the modulation generating generator can be made in the form of a generator of two additional pseudo-noise sequences, matched with the cascade computer 9.
  • the modulation generating generator can be made in the form of a generator of four additional pseudo-noise sequences, matched with a cascade computer 9.
  • the photosensitive detection element of the reflected optical signal can be located on a gyro-stabilized platform. Not shown in the figures.
  • the photosensitive element for detecting the reflected optical signal may have a polarizing filter placed in front of the input of the optical signal to the photosensitive element. Not shown in the figures.
  • the figure 8 shows the cascade computer control unit, the functions of which are performed by the module 8 for calculating the distance to the detected object from the time delay of the reflected signal, see Fig. 3.
  • Stage E1 The generator 2 creates the modulation in the form of a binary pseudo-noise sequence coordinated with the cascade computer 9 and radiates it into space.
  • Stage E2 The signal reflected from the objects is received by the photosensitive detection element of the received signal 4.
  • Stage EZ. Integration is carried out by block 10 at time intervals of duration T 0 of the reflected signal by accumulating a capacitive charge.
  • Stage E4. Multiplex the integration results obtained in stage 3 on a high-speed ADC 7.
  • Stage E5. Convert the results of integration into a digital code (block
  • Stage E6 A digital code is supplied to the first accumulation unit 12 in which the discrete signal is accumulated by summing or subtracting the samples obtained from the output of the ADC 7 with the contents of the memory cells. Before starting the device, all memory cells of the first storage unit are reset.
  • Stage E7 The signal (sequence) accumulated in the memory cells of the accumulation unit 12 is read and fed to the cascade calculator 9.
  • Stage E8 The sequence is supplied from the cascade calculator 9 to the second discrete signal accumulation unit 13 by adding or subtracting the samples received from the ADC output with the contents of the memory cells. Before starting the device, all memory cells of the first storage unit are reset.
  • Stage E9 The contents of the memory cells from the second storage unit 13 are demultiplexed (read in a specific order) to a threshold detector corresponding to a specific pixel (photosensitive detection element of the received signal 4).
  • Stage E10 If the threshold value is exceeded by one or two consecutive samples of the sample, the amplitudes and numbers of these samples are transmitted to the module 8 for calculating the distance to the determined object from the time delay of the reflected signal.
  • Step E11 Calculate the distance to the reflective object.
  • Step E12 Repeat steps E1 -E11.
  • the proposed optical device for determining distances to the object can be carried out by a specialist in practice and, when implemented, ensure the implementation of the declared purpose, which allows us to conclude that the criterion of "industrial applicability" for the invention is met.
  • I 2 (I) clock cycles
  • a pair of such discrete additional sequences has the feature that, when summing their ACFs, we obtain the total ACF with a zero level of side lobes. This is used in radar to suppress side lobes by adding two mutual correlation functions obtained from processing 2 additional signals.
  • Figure 7 shows a device generating these sequences.
  • the sequence ⁇ 1, 0,0,0,0,0,0,0,0 ⁇ is fed to the input of the device.
  • the same device (in Fig. 7) is a matched filter for additional sequences obtained from the generated sequences D1 and D2 by rearranging them in the reverse order.
  • DM1 and DM2 are also optional.
  • DM 1 ⁇ 1, -1, 1, 1, 1, -1, -1, -1, -1 ⁇
  • DM 2 ⁇ 1, -1, 1, 1, -1, 1, 1, 1 ⁇ ;
  • the sequence K1 is obtained by replacing minus ones with zeros in the additional sequence DM 1.
  • the sequence K2 is obtained by replacing units with zeros and replacing minus units with units in the additional sequence DM1.
  • the short sequence is obtained by replacing minus ones with zeros in the additional sequence DM2.
  • the sequence K4 is obtained by replacing units with zeros and replacing minus units with units in the additional sequence DM2.
  • sequences K1, K2, KZ, K4 of zeros and ones are used to modulate the optical signals that are sent to the object and received from the object using a TOF matrix pixel or other photodetector and sent to the cascade calculator.
  • Table 3 shows the VKF (mutual correlation functions) of the DM1 sequences with K1, -DM1 and K2, DM2 and KZ, and VKF -DM2 and K4
  • the sequence -DM1 is the inverted sequence of DM1 and -DM2 is the inverted sequence of DM2
  • an accumulation block is used in which the signal is accumulated in the memory register, in which each calculation clock corresponds to its own memory cell, to the contents of which a corresponding count from the output of the calculator is added.
  • FIG. Figure 8 shows the VKF calculator circuitry, which allows the calculation of the four VKF indicated in Table 3 for their subsequent summation.
  • the K1 sequence and the sequence from the output 1 of the cascade 3 of the cascade calculator are fed to the accumulation block through the output switch to the accumulation unit, for summing 4 VKF.
  • the sequence K2 and the sequence from the output 1 of the cascade 3 of the cascade calculator are fed through the output switch and inverted and fed to the accumulation block.
  • DM codes From DM codes, one can select DM codes in which the number of units is equal to the number “-1”. Such codes provide complete suppression of the filtering illumination of the DC component in the received optical signal, without the use of accumulation. This allows, if necessary, to abandon the accumulation of signals (sequences) from the outputs of the cascade computer, provided that the level of the side lobes of the VKF allows the resolution of signals from several reflecting objects.
  • the delay block is located after input 1,
  • the delay block is located after input 2,
  • the delay unit is located in front of input 1,
  • the delay unit is located in front of input 2,
  • Example 1 VKF without optimization by rearranging cascades and connection options.
  • Example two differs from example one only in that it optimizes the resulting code by rearranging cascades and connections between cascades (device in Fig. 11).
  • FIG. 12 shows the minimax FCF, which is obtained at the output of a cascade computer (see FIG. 11), in which the delays are as follows. In the first cascade, 128 cycles, in the second, 1, and so on, 64,2,32,4,16,8,256, and between the last and penultimate cascade of connections are made so that the first output of the penultimate cascade is connected to the second input of the last cascade and the second output the penultimate cascade is connected to the first input of the last cascade.
  • This VKF is shown in FIG. 12.
  • Example 3 Using the first drive signal Uses a cascade calculator specified in example 2.
  • Example 4 Using the second accumulation block.
  • sequences K1, K2, KZ, K4 are used to modulate the four optical signals emitted into space with an interval of more than T 0 * N.
  • the emitted signal is received by the photosensitive element for detecting the received signal, integrated on the segments T 0 .
  • Figure 13 depicts graphs B, ⁇ , ⁇ , ⁇ on which the emitted signals are reflected modulated by the sequences K1, K2, KZ, K4, and the same signals reflected from the object (graphs B, G, L, P), the integration process of the received signals (graphs G, 3, M, P), at time intervals of duration, discrete samples obtained as a result of integration at intervals are reflected in the graphs D, I, H, C, respectively.
  • chart A the clock pulses are displayed and their numbers supplied to the modulation generator 2 shown in figure 3.
  • FIG. 13 graphs are presented on which the emitted sequences K1, K2, KZ, K4 are reflected (graphs B, E, K, O in figure 13). And the same sequences received by the photosensitive element for detecting the reflected optical signal with some delay that needs to be determined (graphs B, F, L, P in figure 13). The integration process of the detected optical signal is also displayed (graphs G, 3, M, P in figure 13), and the discrete samples obtained as a result of integration on the segments T 0 (graphs D, I, H, C in figure 13), which are then through the multiplexer and high-speed ADC are fed to the computer VKF.
  • the sequence is fed to a discrete transverse filter with a response to a single impulse ⁇ 1, 0,0,0 ⁇ equal to ⁇ 1, 1, -1, 1 ⁇ , i.e. corresponding to the code D1 indicated in the example, read in the reverse order.
  • the second discrete sequence obtained by detecting the reflected signal K2 is fed to a transverse filter with an impulse response ⁇ -1, -1, 1, -1 ⁇ , i.e. corresponding to the code D1 indicated in the example, read in the reverse order and inverted.
  • the third discrete sequence obtained by detecting the reflected short-circuit signal is fed to a transverse filter with an impulse response ⁇ 1, 1, 1, -1 ⁇ , i.e. corresponding to the code D2 indicated in the example, read in the reverse order.
  • the fourth discrete sequence obtained by detecting the reflected signal K4 is fed to a transverse filter with an impulse response ⁇ -1, -1, -1, 1 ⁇ , i.e. corresponding to the code D2 indicated in the example, read in the reverse order and inverted.
  • the four sequences from the outputs of the transverse filters are sequentially summed in the accumulation unit.
  • Table 6 summarizes the results of feeding the sequences obtained as a result of synchronous detection to transverse filters with corresponding weights and the resulting signal from the accumulation block used to determine the delay.
  • the threshold detector detected an excess of the threshold at the output of the accumulation block (suppose the threshold level of signal detection is 1, 0).
  • the threshold level of signal detection is 1, 0.
  • the goal is achieved - an increase in the dynamic range of reflected signals from objects and a reduction in the power consumption of the device by reducing the load on the computing modules.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

Le groupe d'inventions concerne le domaine de mesure des distances jusqu'à un objet au moyen d'ondes électromagnétiques et plus concrètement des dispositifs optiques pour déterminer la distance jusqu'à un objet; lorsqu'un signal d'horloge est généré, on crée la modulation dudit signal d'horloge, on rayonne vers l'objet le signal optique modulé, on reçoit via un élément photosensible le signal optique réfléchi par l'objet, on transforme le signal reçu réfléchi par l'objet, on transforme le signal réfléchi reçu d'un signal analogique en un signal numérique, on calcule la corrélation du signal de référence et du signal réfléchi, on calcule la distance jusqu'à l'objet réfléchi en suivant un retard temporel du signal réfléchi. L'invention peut être utilisée, par exemple, dans la localisation par laser. Selon l'invention, on crée au moins une modulation sous la forme d'une séquence de pseudo-bruit accordée avec un corrélateur en cascade. On procède à l'accumulation intégrale du signal réfléchi provenant de la sortie de l'élément photosensible. On effectue ensuite le multiplexage des signaux venant de plusieurs éléments photosensibles ou de différentes séquences de pseudo-bruit, et à cette fin on envoie des signaux dans un corrélateur en cascade en assurant la possibilité de calcul par un seul corrélateur en cascade d'une pluralité de signaux discrets différents. Un dispositif met en oeuvre ce procédé. Le résultat technique obtenu consiste à élargir la gamme dynamique au niveau des signaux reflétés contre les objets et à réduire la consommation d'énergie électrique par le dispositif grâce à une baisse de charge sur les modules de calcul.
PCT/RU2016/050016 2015-06-08 2016-06-05 Procédé et dispositif optique pour déterminer une distance jusqu'à un objet Ceased WO2016200293A1 (fr)

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WO2012014077A2 (fr) * 2010-07-29 2012-02-02 Waikatolink Limited Appareil et procédé de mesure des caractéristiques de distance et/ou d'intensité d'objets

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RU2195688C2 (ru) * 2000-11-28 2002-12-27 Научно-исследовательский институт измерительных систем Способ измерения расстояния до объектов с помощью пикосекундных импульсов и устройство для его реализации

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Publication number Priority date Publication date Assignee Title
US6753950B2 (en) * 2000-01-26 2004-06-22 Instro Precision Limited Optical distance measurement
US7202941B2 (en) * 2002-11-26 2007-04-10 Munro James F Apparatus for high accuracy distance and velocity measurement and methods thereof
WO2012014077A2 (fr) * 2010-07-29 2012-02-02 Waikatolink Limited Appareil et procédé de mesure des caractéristiques de distance et/ou d'intensité d'objets

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