摘要:
According to the invention a reference measurement is carried out without or with only one measurement object and the frequencies of the noise fraction are determined for the resulting frequency spectrum. Discrete measurement values are determined at equidistant sampling points in the form of complex-value overlays of oscillation functions and the noise and useful frequencies and by means of mathematical calculation methods corrected by the noise fractions. The measurement values corrected in this way are then subjected to a known method of frequency analysis.
摘要:
A circuit arrangement and a method for synchronizing clocks in a network is provided, comprising a plurality of at least two nodes, wherein at least two of said nodes can communicated with each other and each have a local clock, wherein, in a receiving one of said nodes, from at least one transmitting other such node, a global time transmitted by said transmitting one of said node of said transmitting one of said nodes is received, and a global time of said receiving node is determined or estimated as a function of both the received global time of said transmitting node and of a local time of the receiving node's own local clock.
摘要:
A radio transmitter is provided at least comprising a signal generator for generating a continuous signal and an antenna for outputting a transmission signal, wherein at least one output of the signal generator is connected with at least one input of the antenna. Herein, the signal generator is connected with the antenna via an interrupt unit connected between the two for selectively interrupting and maintaining a signal connection between the signal generator and the antenna.
摘要:
A radio transmitter is provided at least comprising a signal generator for generating a continuous signal and an antenna for outputting a transmission signal, wherein at least one output of the signal generator is connected with at least one input of the antenna. Herein, the signal generator is connected with the antenna via an interrupt unit connected between the two for selectively interrupting and maintaining a signal connection between the signal generator and the antenna.
摘要:
In a self-organizing sensor network, a number of sensor nodes organize themselves and include sensor elements, distance measuring elements and communication elements for that purpose. The sensor network is able to precisely locate individual, in particular mobile, sensor nodes.
摘要:
The invention relates to a method for increasing the accuracy of a measurement of a radio-based locating system comprising a mobile station and at least one fixed station, wherein the movement of a mobile station from an initial position is detected by way of measuring data of an absolute sensor system and a relative sensor system, a virtual antenna is embodied in the form of synthetic aperture by way of measuring data and the mobile station is focused on the fixed station and/or vice versa by using the synthetic aperture.
摘要:
A circuit arrangement and a method for synchronizing clocks in a network is provided, comprising a plurality of at least two nodes, wherein at least two of said nodes can communicated with each other and each have a local clock, wherein, in a receiving one of said nodes, from at least one transmitting other such node, a global time transmitted by said transmitting one of said node of said transmitting one of said nodes is received, and a global time of said receiving node is determined or estimated as a function of both the received global time of said transmitting node and of a local time of the receiving node's own local clock.
摘要:
The invention relates to arrangements and methods for improving the signal and transmission properties of laser/electro-optical mixers (EOM) of measuring and data transmission links. The idea of attempting to suppress coherent properties of laser light is novel since, until now, the aim has always been to obtain the greatest possible coherence or coherence length in most technical applications. The invention has the following features: suppressing coherence and intensity fluctuations in the beam path of laser EOM by using optical methods and suppressing the coherence in the output radiation of the laser source, e.g. by a remodulated current pulse modulation or excitation of a number of modes within a laser diode (VCSEL).
摘要:
An imaging method is provided for imaging or locating an object with a wave-based sensor. A wave field emanates from the object as an object signal, with this object signal emanating from a sensor is received at a sensor position, and wherein the sensor(s) and the object assume a number of spatial positions with respect to each other and form a synthetic aperture, and an echo signal is sensed at each of these sensor positions, a number of function values is extracted from the echo signals, which are allocated to a space coordinate of the object, and a signal with a residual phase characteristic is formed from the function values. Based on a residual phase characteristic that is due to a deviation of real sensor positions from assumed or measured sensor positions, an image point, the object position or the relative movement of the object is determined.
摘要:
The invention relates to a method for increasing the accuracy of a measurement of a radio-based locating system comprising a mobile station and at least one fixed station, wherein the movement of a mobile station from an initial position is detected by way of measuring data of an absolute sensor system and a relative sensor system, a virtual antenna is embodied in the form of synthetic aperture by way of measuring data and the mobile station is focused on the fixed station and/or vice versa by using the synthetic aperture.