Method of unambiguous detecting the position of moving object, also ground station and receiver display of radio navigation system for effecting same

Claim 1

A method for the unambiguous detecting of the position of a moving object relative to at least three stationary ground stations of a radio navigation system, one station thereof being the main station, said method comprising generating at said stations and transmitting therefrom signals alternately in the form of long trains comprising a multitude of successive groups of radio pulses with various carrier frequencies and a repetition interval, which depends only on the delay time of the radio pulses reflected by the ionosphere, the repetition frequency of transmitted radio pulses being equal to the frequency at which the most coarse determination of the position of a moving object is effected, the phases of signals on various carrier frequencies being in constant relationship upon transmission; the main station being caused to transmit additionally a synchronizing signal within the spaces between the radio pulses of fundamental signals which carry phase information while the long pulse train of synchronizing signal is being transmitted; said synchronizing signal determining the sequence of transmission of said trains by the stations in a general transmission cycle, said radio pulses generating an electromagnetic field with predetermined frequency and phase relationships; said long trains, as well as the signals reflected by the ionosphere, being received by a receiver-display which determines the sequence of transmissions of pulse trains by the stations in the general cycle resorting to the synchronizing signal, performs a search for radio pulses within each long train and division of signals into waves propagated over the earth surface and waves reflected by the ionosphere; said receiverdisplay then converting the radio pulses of surface waves with various carrier frequencies into undamped oscillations having the same intermediate frequency and a duration equal to that of the long trains, which corresponds to those transmitted by said stations, whereas the relative phases of said oscillations depending on the phase of transmitted signals; said receiverdisplay executing also the measure of difference in phase between said I.F. oscillations within each long train, said difference in phase being equivalent to the phase of signals at the beat frequency of two carrier frequencies; said receiver-display then effecting the measurements of the difference in phase of radio pulses at repetition frequency and the difference between said differences in phase of I.F. oscillations, the two being obtained within different long trains for removing any possible ambiguity and defining accurately the position of a moving object by using the difference in phase between said I.F. oscillations obtained on one of the carrier frequencies within various of the long trains, determining according to said synchronizing signal the sequence of transmission of pulse trains by the station in the general cycle, then in the range of each long train of radio pulses are being searched, said signals being divided into signals propagating over the earth surface and signals reflected by the ionosphere, the signal phase on one of the carrier freequencies measured, the phase difference of two signals determined on one of the carrier frequencies, the difference being used for detecting the exact position of a moving object, signal phases being compared on beat frequencies and radio pulse repetition frequency, the comparison result being used for removing ambiguity of position of a moving object.

Claim 2

A method for the unambiguous detecting of the position of a moving object relative to at least three stationary ground stations of a radio navigation system, one station thereof being the main station, said method comprising generating at said stations and transmitting therefrom signals alternately in the form of long trains comprising a multitude of successive groups of radio pulses with various carrier frequencies and a repetition interval, which depends only on the delay time of the radio pulses reflected by the ionosphere, the repetition frequency of transmitted radio pulses being equal to the frequency at which the most coarse determination of the position of a moving object is effected, the phases of signals on various carrier frequencies being in constant relationship upon transmission; the main station being caused to transmit additionally a synchronizing signal within the spaces between the radio pulses of fundamental signals which carry phase information while the long pulse train of synchronizing signal is being transmitted; said synchronizing signal determining the sequence of transmission of said trains by the stations in a general transmission cycle, said radio pulses generating an electromagnetic field with predetermined frequency and phase relationships; said long trains, as well as the signals reflected by the ionosphere, being received by a receiver-display which determines the sequence of transmissions of pulse trains by the stations in the general cycle resorting to the synchronizing signal, performs a search for radio pulses within each long train and division of signals into waves propagated over the earth surface and waves reflected by the ionosphere; said receiverdisplay then converting the radio pulses of surface waves with various carrier frequencies into undamped oscillations having the same intermediate frequency and a duration equal to that of the long trains, which corresponds to those transmitted by said stations, whereas the relative phases of said oscillations depending on the phase of transmitted signals; said receiverdisplay executing also the measure of difference in phase between said I.F. oscillations within each long train, said difference in phase being equivalent to the phase of signals at the beat frequency of two carrier frequencies; said receiver-display then effecting the measurements of the difference in phase of radio pulses at repetition frequency and the difference between said differences in phase of I.F. oscillations, the two being obtained within different long trains for removing any possible ambiguity and defining accurately the position of a moving object by using the difference in phase between said I.F. oscillations obtained on one of the carrier frequencies within various of the long trains, determining according to said synchronizing signal the sequence of transmission of pulse trains by the station in the general cycle, then in the range of each long train of radio pulses are being searched, said signals being divided into signals propagating over the earth surface and signals reflected by the ionosphere, the signal phase on one of the carrier freequencies measured, the phase difference of two signals determined on one of the carrier frequencies, the difference being used for detecting the exact position of a moving object, signal phases being compared on beat frequencies and radio pulse repetition frequency, the comparison result being used for removing ambiguity of position of a moving object.

Claim 13

A method for the unamibiguous detecting of the position of a moving object relative to at least three stationary ground stations of a radio navigation system, one station being the main station, said method comprising generating at said stations and transmitting therefrom signals alternatively in the form of long trains comprising a multitude of successive groups of radio pulses with various carrier frequencies and repetition intervals, which depend only on the delay Time of radio pulses reflected by the ionosphere, the repetition frequency of the transmitted radio pulses being equal to the frequency at which the most coarse determination of the position of a moving object is effected, the phases of the signals on various carrier frequencies being in constant relationship at the output of the transmitting means; transmitting additionally from the main station a synchronizing signal within the spaces between the radio pulses of fundamental signals which carry phase information, while said long pulse train is being transmitted; said synchronizing signal determining the sequence of transmission of said long pulse trains by the stations in a general transmission cycle, said radio pulses generating an electromagnetic field with predetermined frequency and phase relationships, said long trains, as well as the signals reflected by the ionosphere being received by a receiver-display; determining by means of the receiver-display the sequence of transmissions of long pulse trains from the stations in a general transmission cycle resorting to the synchronizing signal and searching for radio pulses within each long train and dividing signals into waves propagated over the earth surface and waves reflected by the ionosphere; converting by means of said receiver-display the radio pulses of surface waves with various carrier frequencies into undamped oscillations having the same intermediate frequency and a duration equal to that of the long pulse trains, which corresponds to those transmitted by said stations, whereas the relative phases of said I.F. oscillations depends on the phase of transmitted signals; executing by means of said receiver-display the measure of difference in phase between said I.F. oscillations within each long pulse train, said difference in phase being equivalent to the phase of signals at the beat frequency of two carrier frequencies; and effecting by means of said receiver-display the measurements of the difference in phase of radio pulses at repetition frequency and the difference between said differences in phase of I.F. oscillations, the two being obtained within different long pulse trains, for removing any possible ambiguity and defining accurately the position of the moving object by using the difference in phase between said I.F. oscillations obtained on one of the carrier frequencies within various long pulse trains.

Claim 14

A method for the unamibiguous detecting of the position of a moving object relative to at least three stationary ground stations of a radio navigation system, one station being the main station, said method comprising generating at said stations and transmitting therefrom signals alternatively in the form of long trains comprising a multitude of successive groups of radio pulses with various carrier frequencies and repetition intervals, which depend only on the delay Time of radio pulses reflected by the ionosphere, the repetition frequency of the transmitted radio pulses being equal to the frequency at which the most coarse determination of the position of a moving object is effected, the phases of the signals on various carrier frequencies being in constant relationship at the output of the transmitting means; transmitting additionally from the main station a synchronizing signal within the spaces between the radio pulses of fundamental signals which carry phase information, while said long pulse train is being transmitted; said synchronizing signal determining the sequence of transmission of said long pulse trains by the stations in a general transmission cycle, said radio pulses generating an electromagnetic field with predetermined frequency and phase relationships, said long trains, as well as the signals reflected by the ionosphere being received by a receiver-display; determining by means of the receiver-display the sequence of transmissions of long pulse trains from the stations in a general transmission cycle resorting to the synchronizing signal and searching for radio pulses within each long train and dividing signals into waves propagated over the earth surface and waves reflected by the ionosphere; converting by means of said receiver-display the radio pulses of surface waves with various carrier frequencies into undamped oscillations having the same intermediate frequency and a duration equal to that of the long pulse trains, which corresponds to those transmitted by said stations, whereas the relative phases of said I.F. oscillations depends on the phase of transmitted signals; executing by means of said receiver-display the measure of difference in phase between said I.F. oscillations within each long pulse train, said difference in phase being equivalent to the phase of signals at the beat frequency of two carrier frequencies; and effecting by means of said receiver-display the measurements of the difference in phase of radio pulses at repetition frequency and the difference between said differences in phase of I.F. oscillations, the two being obtained within different long pulse trains, for removing any possible ambiguity and defining accurately the position of the moving object by using the difference in phase between said I.F. oscillations obtained on one of the carrier frequencies within various long pulse trains.