• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Method for suppressing an echo signal in a distance measuring device (1) which has at least one photosensitive receiver (2) and at least one laser light source as transmitter (3), characterized in that at least one counter signal (12) corresponding to the echo signal is generated and one from the receiver (2) generated signal (11) is superimposed.
    公开号:AT511882A1
    申请号:T1232/2011
    申请日:2011-08-29
    公开日:2013-03-15
    发明作者:
    申请人:Swarovski Optik Kg；
    IPC主号:
    专利说明:

    17:11:30 29-08-2011 5/18 • · ♦ · • * · Η
    * * Λ I
    The invention relates to a method for suppressing an echo signal in a distance measuring device which comprises at least one light-sensitive receiver and at least one laser light source as a transmitter, wherein the echo signal to be suppressed by remissions of the light emitted by the transmitter at lying before the actual target surfaces - for example, to components of the optical signal path - arises.
    Furthermore, the invention relates to a removal measuring device with at least one photosensitive receiver and at least one laser light source as a transmitter.
    Moreover, the invention relates to a remote optical device, in particular telescope or riflescope.
    In generic Entfemungsmesseinrichtungen, which are also referred to as a laser rangefinder, a distance measurement is performed by a laser pulse or pulse trains are emitted from a transmitter, reflected by the target object to be detected by a receiver, and based on the time delay between the transmit and Receiving pulses the duration and from the backward path is determined.
    In a generic Entfemungsmesseinrichtung sender and receiver can be arranged at least partially in the same optical path. Now, if transmitter and receiver in a housing and perhaps even on the same (prisms) optics, as known for example from WO 2009094687 A2 attached, it may happen that it comes to direct optical crosstalks. This means that a small part of the laser radiated by the transmitter can be heard. Ν2011Ώ4400 29/08 2011 MO 17:11 [SE / EM NR 9959] 00005 17:11:46 29-08-2011 6/18 25
    Mb Μ · · ·:: :::. ** ···; ···················································································································································································· This false measurement signal is usually larger than the signals from a more distant target and therefore disturbs / falsifies the measurement. Since this scattered light is always first in time, only short-range measurements (up to a few 100 meters) are affected. In this document, the term false echo signal refers to all portions of the light emitted by the transmitter due to internal reflection, scattering or other disturbances reaching the receiver.
    The optical crosstalk can be influenced by structural measures (eg diaphragms, geometry). Electronically, for example. a first temporal window are defined, in which eg. the receiver or the amplifier are not active, as here the crosstalk is present. Only after the expiration of this window, a distance measurement is then performed. But this has the disadvantage that in this window no measurement can be performed at all. US Pat. No. 7,599,045 B2 implements this "blind" window in which the part located and branched off in this time window is inverted by the detected signal and added back to the measurement signal, so that the sum signal becomes zero. A disadvantage of the known embodiment is that due to the blind1 window only distances of significantly more than 100 m can be measured.
    The invention is therefore based on the object to minimize the influence of the optical crosstalk by electronic measures so far that even at short measurement distances (<100m), a distance measurement is possible without real echoes are inadmissible suppressed.
    This object is achieved with a method of the aforementioned type according to the invention that at least one of the echo signal corresponding counter signal is generated and superimposed on a signal generated by the receiver. Due to the superimposition of the counter signal, the proportion of the crosstalk is purposefully reduced and thus the reliability of the measurement is increased in a simple manner. N2011 / 24400 29/08 2011 MO 17:11 [SE / EM NR 9959J 0006 17:12:05 29-08-2011 7/18 25, t. .. * · · ·. * * .. * * .. * * · - 3 ........
    According to the preferred embodiment of the invention, the signal generated by the receiver and the counter signal are subtracted from each other. In this way, interference can be easily reduced or eliminated. In addition, to obtain a good signal-to-noise ratio, a resulting difference signal of the signal generated by the receiver and the counter signal can be amplified.
    According to a further advantageous embodiment of the invention, in a calibration step, a height and / or an amount and / or an amplitude and / or a pulse shape of the counter signal can be varied. According to an advantageous variant, the calibration step can be carried out at the beginning of each distance measurement. Since this is a variable compensation, even over time changing crosstalk can be compensated.
    A particularly favorable development of the invention provides that, as part of the calibration step, a signal vector of the resulting signal is analyzed. In this way, a very reliable calibration can be guaranteed.
    The quality of the measurement accuracy achievable with the distance measuring device can be further improved by repeating the calibration step several times.
    The object mentioned in the introduction can also be achieved with a distance measuring device of the type mentioned in the introduction in that it is set up to provide a counter signal corresponding to an echo signal! and to superimpose a signal generated by the receiver.
    According to an advantageous development of the invention, the distance measuring device can be set up to subtract the signal generated by the receiver and the counter signal from each other. N2011 / 24400 29/08 2011 MO 17:11 [SE / EM NR 9959] 0007 17:12:22 29-08-2011 8/18 25 • * * »·« ~ · .. * * .. * · * · * .....
    Another very advantageous variant of the invention provides that the distance measuring device is set up to amplify a resulting Differenzsignai the echo signal and the counter signal.
    Moreover, according to a particularly favorable development of the invention, it is possible for the distance measuring device to be set up to vary a height and / or an amount and / or an amplitude and / or a pulse shape of the counter signal in a calibration step.
    According to a preferred embodiment of the invention, the distance measuring device may be configured to perform the calibration step at the beginning of the distance measurement. In addition, it can be provided that the distance measuring device is set up to analyze a signal vector of the resulting difference signal as part of the calibration step.
    Furthermore, the distance measuring device can be configured to repeat the calibration step several times.
    The above object can also be achieved with a fem-optic device of the type mentioned, which has a Entfemungs-measuring device according to the invention, wherein the transmitter and receiver are at least partially disposed in the same optical path.
    The invention together with further advantages will be explained below with reference to some non-limiting embodiments, which are illustrated in the drawings.
    Each shows in a highly schematically simplified representation:
    Fig. 1 is a block diagram of a distance measuring device according to the invention;
    FIG. 2 shows a signal course of a signal resulting from a superposition between an echo signal and a counter signal; FIG.
    Fig. 3 is a block diagram of another embodiment of the invention, N2011 / 24400 29/08 2011 MO 17:11 [SE / EM NO 9959] @ 008 17:12:39 29-08-2011 9/18 ·· »* **. , ... , , * ...... : :::. '* · · ·. * · .. * · .. · * ..- 5 -.....
    By way of introduction, it should be noted that in the differently described embodiments, the same parts are provided with the same reference numerals or the same component names, wherein the disclosures contained in the entire description can be mutatis mutandis to the same parts with the same reference numerals or component names. Also, the location information chosen in the description, such as top, bottom, side, etc. related to the immediately described and illustrated figure and are to be transferred to the new situation mutatis mutandis when a change in position. Furthermore, individual features or combinations of features from the illustrated and described different Ausführungsbeispieten can represent for themselves, inventive or inventive solutions.
    According to the embodiment of the invention shown in FIG. 1, a distance measuring device according to the invention can have a light-sensitive receiver 2 and a laser light source as transmitter 3. Transmitter 3 and receiver 2 may be wholly or partly in the same optical path, which is indicated in Fig. 1 by a double arrow and the letter P lie or run. That the transmitters and receivers can be arranged coaxially. The receiver can be designed as a photodiode, for example as an avalanche diode. As can also be seen from FIG. 1, the distance measuring device can be arranged in or on a remote optical device 9.
    The electrical signal (current) 11 generated by the receiver / detector 2 (avalanche photodiode) is amplified by means of an amplifier 4 and analyzed by a microprocessor 5. Instead of a microprocessor, a signal processor or other suitable programmable circuit may be provided. Furthermore, a controlled current source 6 for generating a signal or
    Electricity I2.
    In front of the amplifier 4 a summing node 7 is arranged, where the signals 11 +! 2 are superimposed to the signal I3, so that 13 = 11 + 12.
    The microprocessor 5 determines in a known manner, the timing of the reflected (emitted by the transmitter 3) (light) pulses and calculates the distance 13 from the target. Since the reflected pulses are usually very N2011 / 24400 29/08 2011 MO 17:11 [SE / EM NR 9959] ®009 17:12:59 29-08-2011 10/18 25
    small and with a lot of background noise, an entire pulse train (up to several 1000 pulses) is evaluated by averaging to improve the signal-to-noise ratio.
    For each measurement, the first pulses are used to determine the contribution of the optical crosstalk (echo signal). For this purpose, the microprocessor 5 analyzes, as shown in Fig. 2, a very early time window in which a part of the optical crosstalk (echo signal) is present. With this information about the signal level in this time window, a counterpulse is generated above the controlled current source 6, which is now superimposed on the measuring signal 11, which is generated by the receiver 2, before the amplifier and thus reduces the proportion of the crosstalk (echo signal). The microprocessor 5 evaluates this new signal I3 in this time window 8 again and checks whether the signal I3 has shrunk in this temporal window. Should it still be too large, the process (up to a maximum number of cycles, which is essentially limited only by the available measuring time) is repeated in a further adaptation of the pulse height and the temporal position of the counter pulse I2. That It is checked whether the height of the signal I3 within the time window 8 corresponds to a desired value for the signal level of the signal I3, as it corresponds to a disturbed by no reflections, stray light, etc. of the transmitter state. The signal I3 is thus regulated by changing the signal I2 to the setpoint. In this way, the echo signal before the signal evaluation in the microprocessor 5 can be suppressed or compensated.
    As shown in FIG. 3, the receiver 2 may have an internal amplifier 10 adjacent to the (avalanche) photodiode. The signal 11 and / or the counter signal I2 and / or the signal I3 can be subjected in a stage 11 to pulse width modulation (PFN) and / or impedance matching and / or filtering before being supplied to the amplifier 4. Furthermore, the microprocessor 5 may be preceded by an analog / digital converter 12.
    Fig. 2: shows the current I3 after the summation. The window 8, in which the sum signal I3 must lie, is hatched. The largest curve in Fig. 2 N2011 / 24400 29/08 2011 MO 17:11 [SE / FM NR 9959] © 010 17:13:19 29 * 08-2011 11/18 ► * · * * * * * * * · * * * * '7 * · * * * * * * Μ · · &gt; If there is no compensation, then the calibration steps will continue to decrease until the lowest value then lies in the window - &gt; Calibration completed.
    Once this calibration curtain has been completed, the actual measurement takes place. This has the advantage that, after compensation of the crosstalk, measurements are also possible with short propagation times (short distances) and since a compensation is calibrated before each measurement, time-varying crosstalkers (eg by fingerprints on the front lens, settling dust particles, easily changing optical paths due to mechanical or thermal influences, changing pulse amplitude of the transmitter) can also be taken into account. It is assumed that the pulse shape of the crosstalk equals the same. In general, however, it is also conceivable to make the pulse shape variable in the control loop and to take it into the control loop for compensation as a further parameter (in addition to the pulse height and the temporal position).
    As an alternative to or in addition to the above-mentioned scheme, using an avalanche photodiode, its bias could be changed so that it is not "sharp" during the start of the range measurement and provides substantially no measurement signals. A presettable period of time after the start of the measurement, the bias voltage could then be increased so that the avalanche photodiode is sensitive enough for the detection of the light pulse reflected from the target.
    It would also be possible, alternatively or in addition to the embodiments mentioned in the last paragraph, to vary the amplification factor of at least one of the stages of the amplifier 4 as a function of time, then signal amplification could not take place at the beginning of the measurement and the amplification corresponding to a defined period of time after the start of the measurement increase. N2011 / 24400 29/08 2011 MO 17:11 [SE / EM NR 9959] @ 011 17:14:12 29-08-2011 15/18 • * 4 * »«
    REFERENCE NUMBERS
    Distance measuring system Receiver Transmitter Amplifier Microprocessor Power source Summation node Time window Remote optical device Internal amplifier Puisweitenmodulator Analog / digital converter Distance to destination N2011 / 24400 29/08 2011 MO 17:11 [SE / EM NR 9959] 0015
    权利要求:
    Claims (15)
    [1]
    17:13:36 29-08-2011 12/18 • * *. 1. A method for suppressing an echo signal in a distance measuring device (1), which at least a light-sensitive receiver (2) and at least one laser light source as transmitter (3), characterized in that at least one counter signal (I2) corresponding to the echo signal is generated and superimposed on a signal (11) generated by the receiver (2).
    [2]
    2. The method according to claim 1, characterized in that the of the receiver (2) generated signal (11) and the counter signal (I2) are superimposed additively or sub-traktiv.
    [3]
    3. The method according to any one of claims 1 to 2, characterized in that a resulting signal (I3) of the receiver (2) generated signal (M) and the counter signal (I2) are amplified.
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that in a calibration step, a height and / or an amount and / or an amplitude and / or a Puisformdes the counter signal (i2) are varied.
    [5]
    5. The method according to claim 4, characterized in that the calibration-rierungsschritt is carried out before the distance measurement.
    [6]
    6. The method according to claim 4 or 5, characterized in that in the context of the calibration step, a signal vector of the resulting signal (I3) is analyzed.
    [7]
    7. The method according to any one of claims 4 to 6, characterized in that the calibration step is repeated several times. N2011 / 24400 29/08 2011 MO 17:11 [SE / EM NR 9959] 0012 17:13:50 29-08-2011 13/18 25 17:13:50 29-08-2011 13/18 25

    '* 2
    [8]
    8. Distance measuring device (1) with at least one light-sensitive receiver (2) and at least one laser light source (3) as transmitter, characterized in that the distance measuring device (1) is arranged to generate at least one counter signal (12) corresponding to an echo signal and to superimpose a signal generated by the receiver (2).
    [9]
    9. Entfemungsmesseinrichtung, according to claim 8, characterized in that it is adapted to the signal generated by the receiver (2) (11) and the counter signal (I2) additively or subtractively superimposed.
    [10]
    Distance measuring device according to claim 8 or 9, characterized in that it is arranged to amplify a resultant signal (I3) of the signal generated by the receiver (11) and of the counter signal (12).
    [11]
    11. Distance measuring device according to one of claims 8 to 10, characterized in that it is adapted to vary in a calibration step, a height and / or an amount and / or an amplitude and / or a pulse shape of the counter signal (I2).
    [12]
    12. Entfemungsmesseinrichtung according to claim 11, characterized in that it is adapted to perform the calibration step before the distance measurement.
    [13]
    13. Distance measuring device according to one of Ansprüchel 1 to 12, characterized in that it is adapted to analyze a signal vector of the resulting signal (I3) in the context of the calibration step.
    [14]
    14. Distance measuring device according to one of claims 11 to 13, characterized in that it is adapted to repeat the calibration step several times. N2Q11 / 24400 29/08 2011 MO 17:11 [SE / EM NR 9959] 0013 25 25 14/18 17:14:06 29-08-2011 # t I »» * * k »I ·» * * · I | »* * * * 4 F t &lt; * * * * 4 »I · ♦» · * (K • * * * * · "O


    [15]
    15. Femoptische device (9), in particular telescope or riflescope, characterized in that it comprises a distance measuring device {1) according to any one of claims 8 to 14, wherein transmitter (2) and receiver (3) at least partially in the same optical path (P ) are arranged. Swarovski-Optik KG. by lawyers Burger &amp; Partner 'Rechtsanwalt GmbH N2011 / 24400 29/08 2011 MO 17:11 [SE / EM NR 9959] @ 014
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA1232/2011A|AT511882B1|2011-08-29|2011-08-29|METHOD FOR SUPPRESSING AN ECHOSIGNAL|ATA1232/2011A| AT511882B1|2011-08-29|2011-08-29|METHOD FOR SUPPRESSING AN ECHOSIGNAL|
    US13/596,675| US9025138B2|2011-08-29|2012-08-28|Method for suppressing an echo signal|
    EP12181956.9A| EP2565669B1|2011-08-29|2012-08-28|Method for suppressing an echo signal|
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