SURVEYING INSTRUMENT

1 . A surveying instrument comprising:

a base,

a support mounted on the base and configured for being rotatable relative to the base around an azimuth axis,

a first angle encoder configured for measuring a rotatory position of the support,

a targeting unit mounted on the support and configured for being rotatable relative to the support around an elevation axis to aim at a targeted object,

a second angle encoder configured for measuring a rotatory position of the targeting unit,

wherein the targeting unit comprises

a measuring beam emitter configured for emitting the measuring beam, and

a measuring beam receiver configured for receiving a reflection of the measuring beam,

wherein the surveying instrument is configured to measure 3D coordinates corresponding to a targeted object,

wherein the targeting unit comprises a perceptibility beam emitter configured to: project a perceptibility beam onto an object, wherein the perceptibility beam comprises light from a spectral range visible to the human eye,

wherein the surveying instrument is configured for running a perceptibility enhancing mode,

wherein, when running the perceptibility enhancing mode, the perceptibility beam emitter is directed to emit the perceptibility beam with a modulation,

wherein the modulation has a switching frequency of at least 0.25 Hz but lower than 200 Hz,

wherein the surveying instrument is configured for wirelessly receiving a command signal from an external controller device, and configured for controlling the perceptibility enhancing mode based on the received command signal,

wherein the command signal is at least one of

a first command signal for activating a perceptibility enhancing mode upon receipt of the first command signal,

a second command signal for deactivating a perceptibility enhancing mode upon receipt of the second command signal,

a third command signal for modifying an intensity of the perceptibility beam upon receipt of the third command signal,

a fourth command signal for assigning to the perceptibility beam a unique modulation pattern identifying the surveying instrument upon receipt of the fourth command signal, and

a fifth command signal for modifying a modulation of the perceptibility beam upon receipt of the fifth command signal.

2 . The surveying instrument according to claim 1 , wherein the perceptibility beam emitter and the measuring beam emitter are separate units.

3 . The surveying instrument according to claim 1 , wherein, when running the perceptibility enhancing mode, the surveying instrument is configured for adapting the modulation based on at least one of:

a measured distance to the object,

a characteristic of the reflection of the measuring beam, or

a status of the surveying instrument.

4 . The surveying instrument according to claim 1 , wherein the modulation comprises an amplitude modulation, or a frequency modulation.

5 . The surveying instrument according to claim 1 , wherein the modulation has a pattern that comprises a rectangle pattern, a sine pattern, a triangle pattern, or a saw pattern.

6 . The surveying instrument according to claim 1 ,

wherein the modulation is a blinking pattern with sudden passages and/or fluent passages, and

wherein the blinking pattern comprises an alternation between at least two different amplitudes or frequencies.

7 . The surveying instrument according to claim 6 , wherein a time interval between the subsequent alterations of the blinking is not identical.

8 . The surveying instrument according to claim 1 , wherein the modulation has a pattern that is irregularly repetitive comprising a defined or random sequence of modulations.

9 . The surveying instrument according to claim 1 ,

wherein the perceptibility beam is laser light, and

wherein the switching frequency and a duty cycle of the modulation are dimensioned such that a peak power of the perceptibility beam is higher than an average power permitted in a laser class of the perceptibility beam.

10 . A method for performing an outdoor stakeout by a surveying system, wherein the surveying system comprises

a surveying instrument comprising,

a support mounted on a base and configured for being rotatable relative to the base around an azimuth axis,

a targeting unit mounted on the support and configured for being rotatable relative to the support around an elevation axis to aim at a targeted object, the targeting unit comprising

a measuring beam emitter configured for emitting the measuring beam and a measuring beam receiver configured for receiving a reflection of the measuring beam, and

a perceptibility beam emitter configured to project a perceptibility beam onto an object, wherein the perceptibility beam comprises light from a spectral range visible to the human eye

wherein the surveying instrument is configured for running a perceptibility enhancing mode, wherein, when running the perceptibility enhancing mode, the perceptibility beam emitter is directed to emit the perceptibility beam with a modulation having a switching frequency of at least 0.25 Hz but lower than 200 Hz

a remote-control device configured to wirelessly provide commands signals to the surveying instrument, and

a target plate comprising a center point

wherein the stakeout method comprises

providing the surveying instrument,

providing the targeting plate and the remote-control device to an operator,

aligning the targeting unit in a direction of a point to be staked out and projecting a perceptibility beam by a perceptibility beam emitter in a direction of a point to be staked out,

providing, by the remote-control device, at least one command signal,

receiving, by the surveying instrument, the at least one command signal and performing a corresponding action, and

adjusting a pose of the target plate such that the perceptibility beam strikes the center point,

wherein the at least one command signal is at least one of

a first command signal, and wherein the corresponding action comprises an activation of the perceptibility enhancing mode,

a second command signal, and wherein the corresponding action comprises a deactivation of the perceptibility enhancing mode,

a third command signal, and wherein the corresponding action comprises modifying an intensity of the perceptibility beam,

a fourth command signal, and wherein the corresponding action comprises assigning to the perceptibility beam a unique modulation pattern identifying the surveying instrument, and

a fifth command signal, and wherein the corresponding action comprises modifying a modulation of the perceptibility beam.

11 . The method according to claim 10 , wherein the surveying instrument is configured to measure 3D coordinates corresponding to a targeted object and wherein the method further comprises

projecting, by the measuring beam emitter, the measuring beam to the center point, and

providing a distance of the center point from the surveying instrument.

12 . The method according to claim 11 further comprising adjusting a pose of the target plate based on the distance provided.

13 . The method according to claim 11 further comprising

adapting the modulation of the perceptibility beam depending on a status of the surveying instrument, wherein a status of the surveying instrument comprises information regarding a measurement error.

14 . The method according to claim 13 , wherein the adapted modulation is a non-repetitive pattern comprising chronologically non-equidistant switches.

15 . The method according to claim 10 , wherein the modulation is an amplitude modulation, and the perceptibility beam is switching between two or more different light intensities.

16 . The method according to claim 10 , wherein the stakeout is performed under bright daylight conditions and/or in rain.

17 . Surveying system, comprising a surveying instrument, a target plate and a remote control device,

wherein the surveying instrument comprises

a base,

a support mounted on the base and configured for being rotatable relative to the base around an azimuth axis,

a first angle encoder configured for measuring a rotatory position of the support,

a targeting unit being mounted on the support and configured for being rotatable relative to the support around an elevation axis, thereby enabling the targeting unit of aiming at a targeted object,

a second angle encoder configured for measuring a rotatory position of the targeting unit,

wherein the targeting unit comprises

a measuring beam emitter configured for emitting the measuring beam, and

a measuring beam receiver configured for receiving a reflection of the measuring beam,

wherein the surveying instrument is configured to measure 3D coordinates corresponding to a targeted object,

wherein the targeting unit comprises a perceptibility beam emitter configured to project a perceptibility beam onto an object, wherein the perceptibility beam is a laser beam visible to the human eye,

wherein the surveying instrument is configured for running a perceptibility enhancing mode,

wherein, when running the perceptibility enhancing mode, the perceptibility beam emitter is directed to emit the perceptibility beam with a modulation,

wherein the modulation has a switching frequency of at least 0.25 Hz but lower than 200 Hz,

wherein the surveying instrument is configured

to wirelessly receive a signal from an external controller device, and

in response to the signal, activating the perceptibility enhancing mode or

modifying the perceptibility enhancing mode with regard to the modulation,

wherein the remote control device is configured to wirelessly provide at least one of,

a first command signal to activate a perceptibility enhancing mode,

a third command signal to adjust the intensity of the perceptibility beam, and

a fifth command signal to adjust the modulation of the perceptibility beam, wherein the target plate comprises a center point configured to be targeted by the perceptibility beam.

18 . The surveying system according to claim 17 , wherein the perceptibility beam emitter and the measuring beam emitter are separate units.

19 . The surveying system according to claim 17 , wherein the remote-control device is configured to provide a fourth command signal for assigning to the perceptibility beam a unique modulation pattern identifying the surveying instrument and the surveying instrument is configured to modify the modulation pattern of the perceptibility beam upon receipt of the fourth command signal.

20 . The surveying system according to claim 19 , wherein the surveying system further comprises Augmented Reality (AR)-device

wherein the AR-device comprises a camera and an AR-display,

wherein the camera is configured for detecting the modulation at the projection of the perceptibility beam on the object,

wherein the AR-device is configured for identifying the surveying instrument based on the unique modulation pattern, and

wherein the display is configured for providing an overlay based on the identified surveying instrument.