Abstract: According to the invention, a light signal is emitted to one or several targets in order to derive geodetic distance data therefrom. Apparatus components such as transmitters (1?) and receivers (4?) are modeled along with the targets (3a and 3b) as a linear, time-invariant system which is excited by means of a signal s(t) and the system response y(t) of which is recorded. Unlike in delay meters or phase meters, the distance data is derived from both the delay and the signal form of the system response.

Abstract: According to the invention, the sensitivity of a method for electronic measurement may be improved, carried out by the principle of heterodyne reception with the steps of broadcast of pulsed electromagnetic radiation (ES) with at least one pulse repetition frequency, reception of back-scattered radiation (RS), whereby the back-scattered radiation (RS) is converted into a received signal, mixing of the received signals, determination of at least one time parameter from the at least one output signal, whereby on mixing the received signals at least two pulsed mixed signals are mixed to give at least two output signals and the at least two mixed signals are phase-shifted relative to each other.

Abstract: According to the invention, high precision distance measurement may be carried out by the broadcast of pulsed electromagnetic radiation (ES) with at least two pulse repetition frequencies, whereby the pulse repetition frequencies are selected such that the corresponding pulse separations do not have a common multiple in the range of the order of magnitude of a maximum external measurement range. The radiation is hence transmitted both to a target for measurement over the measurement path outside the device and also over a reference path inside the device, whereby the radiation (IS) passing along the reference path defines at least one start pulse and the radiation (ES) passing along the measurement path defines at least one stop pulse.

Abstract: According to the invention, high precision distance measurement may be carried out by the broadcast of pulsed electromagnetic radiation (ES) with at least two pulse repetition frequencies, whereby the pulse repetition frequencies are selected such that the corresponding pulse separations do not have a common multiple in the range of the order of magnitude of a maximum external measurement range. The radiation is hence transmitted both to a target for measurement over the measurement path outside the device and also over a reference path inside the device, whereby the radiation (IS) passing along the reference path defines at least one start pulse and the radiation (ES) passing along the measurement path defines at least one stop pulse.

Abstract: According to the invention, a light signal is emitted to one or several targets in order to derive geodetic distance data therefrom. Apparatus components such as transmitters (1?) and receivers (4?) are modeled along with the targets (3a and 3b) as a linear, time-invariant system which is excited by means of a signal s(t) and the system response y(t) of which is recorded. Unlike in delay meters or phase meters, the distance data is derived from both the delay and the signal form of the system response.

Abstract: Disclosed is an optical communication system enabling communication between several co-existing transmitting and receiving stations. In order to allow communication between the co-existing stations, a robust physical layer header (RPLH; 50) is employed which can be understood by all participating stations. This robust header (50) at least comprises a preamble (52) consisting of frames forming a periodic sequence of pulses, the number of slots per frame and the frame content being known to all participating stations. The preamble (52) serves for relative synchronization and carrier detection of the receiving stations. The robust header (50) further comprises a unique synchronization word (53) used for absolute synchronization of the receiving stations. This synchronization word (53) is followed by a control field (59) of fixed length and known structure. By means of this control field (59) the receiving stations are informed which modulation method will be used for the transmission of data.