A method for generating private eLoran signals includes receiving, by a transmitter that is configured to transmit a transmission at a fixed time, a transmission key; determining, by the transmitter, a pseudo-random transmission time for transmitting the transmission, where the pseudo-random ...
According to this constitution by which the dynamic range has been multipled by (k) times substantially, resolution of an A/D converter is elevated substantially, also the amplitude ratio is measured exactly even in case when S/N has been deteriorated, and a cycle of a loran C receiving ...
PURPOSE:To reduce the time to the detection of the leading edge of a loran C signal, by dividing the shift of a sampling pulse into two stages to detect the leading edge of the loran C signal. CONSTITUTION:In a sampling circuit 4, samplings of received loran C signals are summed up by...
PURPOSE:To enable the detection of a specific cycle of a carrier accurately and for a short time even under an adverse condition in the S/N ratio of a loran C signal by including an envelope detection means, a reference envelope memory means and an envelope collimation means for determining ...
PURPOSE:To facilitate the acquisition of a master station signal even in a region wherein S/N is bad, by sampling the master station signal in plural times by an acquisition timing based on a current position and a plurality of acquisition timings of slave stations discriminated according to ...
PURPOSE:To detect exactly a loran C signal in a short time by sampling a received loran C signal by a sampling signal of a prescribed period, holding it, storing it repeatedly at every prescribed period, and deciding whether the loran C signal axists or not, basing on this storage. ...
PURPOSE:To effectively accomplish the phase trace with the use of a simple device by adding the signals, which are operative to effect the step of plus ten microseconds, to a signal region for each preset time when the S/N ratio is deteriorated in a three wave detecting unit. CONSTITUTION:...
PURPOSE: To obtain a system and a method which cirtificate the position of a mobile object having a radio receiver receiving a low frequency radio wave induced from at least three loran C transmitters, and detect the position of an mobile object of illegal user and its identification. ...
PURPOSE:To perform a phase tracking operation at a high accuracy by varying the constant of a loop filter means for correcting the timing of generating a comparison signal so as to coincide with the phase of a loran pulse received based on the results of the phase comparison corresponding to ...