Patent US5375258A successfully refreshed from Google Patents.
Patent US3889258A successfully refreshed from Google Patents.
US3889258A
Expired / Lapsed
US
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Navigation ranging synchronization
Assignee: Texas Instruments Inc
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Filing: 1973-08-22
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Granted: 1975-06-10
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Expires: 1993-08-22
Abstract
Abstract In radio ranging from a mobile station and a plurality of base stations, different pulse position codes are transmitted from the mobile station in sequence, one code for each base station. Identical reply pulse position codes are transmitted from each base station in response to receipt of one of the unique codes. In response to receipt of each reply code, a plurality of trains of listening intervals, one for each base station, are initiated each being dependent upon the time of receipt of a reply code from a base station. A train of uniformly time spaced ranging pulses is then transmitted after receipt of a reply pulse code from the base stations. The transporting of ranging pulses from each base station is enabled in a sequence between base stations responsive to successive ranging pulses in the train.
Inventors
- 👤 Jerry D Holmes
- 👤 Samuel D Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:01
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/74
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
263 words
A radio ranging system comprising: a. means periodically to transmit from a mobile station a short time sequence of pulse position sync codes including one code uniquely tailored for receipt only by each one of a plurality of base stations, b. means operative in the interval between sync code sequences for transmitting a long train of uniformly time spaced range interrogation pulses, c. transponder means to transmit a sync reply code upon receipt by each base station of the sync code tailored thereto where said reply code is the same as from all base stations but time delayed dependent upon range from said mobile station, d. means to generate a train of receive time gates, one for each base station in response to receipt of a sync reply code from each base station with the time gates synchronized with said range interrogation pulses and of phase determined by the arrival time of a sync reply code from each base station, e. transponder means to transmit from each base station a range reply pulse in response to receipt of said range interrogation pulses, and f. measuring means at said mobile station for measuring the time interval between transmission of range interrogation pulses and reception of range reply pulses detected at said mobile station within a receive time gate for each said base station, whereby reponses to range reply pulses are limited to pulses falling within said gates the phases of which automatically are adjusted for change in range due to motion of said mobile station by the periodic repetition of said sync code sequence.
Claim 2
Dependent Claim
263 words
A radio ranging system comprising: a. means periodically to transmit from a mobile station a short time sequence of pulse position sync codes including one code uniquely tailored for receipt only by each one of a plurality of base stations, b. means operative in the interval between sync code sequences for transmitting a long train of uniformly time spaced range interrogation pulses, c. transponder means to transmit a sync reply code upon receipt by each base station of the sync code tailored thereto where said reply code is the same as from all base stations but time delayed dependent upon range from said mobile station, d. means to generate a train of receive time gates, one for each base station in response to receipt of a sync reply code from each base station with the time gates synchronized with said range interrogation pulses and of phase determined by the arrival time of a sync reply code from each base station, e. transponder means to transmit from each base station a range reply pulse in response to receipt of said range interrogation pulses, and f. measuring means at said mobile station for measuring the time interval between transmission of range interrogation pulses and reception of range reply pulses detected at said mobile station within a receive time gate for each said base station, whereby reponses to range reply pulses are limited to pulses falling within said gates the phases of which automatically are adjusted for change in range due to motion of said mobile station by the periodic repetition of said sync code sequence.
Claim 3
Dependent Claim
36 words
The system of claim 1 further comprising control means for transmitting said sync pulse code sequences at about one minute intervals repeatedly to readjust said phase in dependence upon change in position of said mobile stations.
Claim 4
Dependent Claim
46 words
The system of claim 1 wherein means at said mobile station generating said sync codes includes two surface wave devices to produce spread spectrum pulses for said code and wherein matched surface wave devices at said base stations compress said pulses to facilitate sensing said codes.
Claim 5
Independent Claim
194 words
A system to establish the radio range of a mobile station relative to a pair of base stations comprising: a. means periodically to transmit a sequence of two different sync pulse codes from said mobile station, b. decoder means to decode said sync codes at a first of said base stations and transpond a reply pulse code, c. decoder to decode the other of said sync codes at the second of said base stations and transpond with said reply pulse code, d. means to transmit range interrogation pulses from said mobile stations at a predetermined rate in the intervals between said sync pulse code sequences, e. means at said mobile station to establish range gates synchronized to said range interrogation pulses for each said base station but adjusted in phase by receipt at said mobile station of a reply pulse code, f. means at said base stations to receive said range interrogation pulses and to respond by transmission of range reply pulses, and g. means at said mobile station to measure the time intervals between transmission of range interrogation pulses and receipt within said range gates of range reply pulses from said base stations.
Claim 6
Independent Claim
194 words
A system to establish the radio range of a mobile station relative to a pair of base stations comprising: a. means periodically to transmit a sequence of two different sync pulse codes from said mobile station, b. decoder means to decode said sync codes at a first of said base stations and transpond a reply pulse code, c. decoder to decode the other of said sync codes at the second of said base stations and transpond with said reply pulse code, d. means to transmit range interrogation pulses from said mobile stations at a predetermined rate in the intervals between said sync pulse code sequences, e. means at said mobile station to establish range gates synchronized to said range interrogation pulses for each said base station but adjusted in phase by receipt at said mobile station of a reply pulse code, f. means at said base stations to receive said range interrogation pulses and to respond by transmission of range reply pulses, and g. means at said mobile station to measure the time intervals between transmission of range interrogation pulses and receipt within said range gates of range reply pulses from said base stations.
Claim 7
Dependent Claim
158 words
In radio ranging, the method comprising: a. transmitting from a mobile station a train of uniformly spaced range interrogation pulses, b. transponding range reply pulses from each of a plurality Of base stations which receive said range interrogation pulses, c. for each base station initiating at said mobile station a time measurement upon transmission of said range interrogation pulses, d. for each said time measurement, establishing a train of receive time gates synchronized with said interrogation pulses, said receive time gates for any given base station occuring at times different than the receive time gates for any other base station, and e. periodically automatically adjusting the phase of said time gates in dependence upon the range from said mobile station to each said base station to position one of said gates in time coincidence with range reply pulses from respective ones of said base stations while said mobile station moves to alter range to the respective base stations.
Claim 8
Dependent Claim
158 words
In radio ranging, the method comprising: a. transmitting from a mobile station a train of uniformly spaced range interrogation pulses, b. transponding range reply pulses from each of a plurality Of base stations which receive said range interrogation pulses, c. for each base station initiating at said mobile station a time measurement upon transmission of said range interrogation pulses, d. for each said time measurement, establishing a train of receive time gates synchronized with said interrogation pulses, said receive time gates for any given base station occuring at times different than the receive time gates for any other base station, and e. periodically automatically adjusting the phase of said time gates in dependence upon the range from said mobile station to each said base station to position one of said gates in time coincidence with range reply pulses from respective ones of said base stations while said mobile station moves to alter range to the respective base stations.
Claim 9
Dependent Claim
148 words
In radio ranging from a mobile station and a pair of base stations, the method of: a. transmitting from said mobile station in sequence two pulse position codes, one for each said base station, b. transmitting from said base stations identical reply pulse position codes in response to receipt of one of said unique codes, c. in response to receipt of said reply codes initiating two trains of listening intervals each dependent in phase upon the time of receipt of a reply pulse position code from a base station, d. transmitting a train of uniformly time spaced range interrogation pulses after receipt of said reply pulse position codes from both said base stations, e. transponding range reply pulses from said base stations in response to receipt of successive range interrogation pulses, and f. measuring ranging time intervals in dependence upon range reply pulses received only in said intervals.
Claim 10
Dependent Claim
148 words
In radio ranging from a mobile station and a pair of base stations, the method of: a. transmitting from said mobile station in sequence two pulse position codes, one for each said base station, b. transmitting from said base stations identical reply pulse position codes in response to receipt of one of said unique codes, c. in response to receipt of said reply codes initiating two trains of listening intervals each dependent in phase upon the time of receipt of a reply pulse position code from a base station, d. transmitting a train of uniformly time spaced range interrogation pulses after receipt of said reply pulse position codes from both said base stations, e. transponding range reply pulses from said base stations in response to receipt of successive range interrogation pulses, and f. measuring ranging time intervals in dependence upon range reply pulses received only in said intervals.
Claim 11
Dependent Claim
44 words
The method of claim 6 wherein at each base station, in response to receipt of each said unique code, a sequence of enable conditions is initiated to permit each said base station exclusively to respond to selected members of said train of range pulses.
Claim 12
Dependent Claim
31 words
The method of claim 7 wherein a time sequence is initiated for controlling base station response enable conditions in response to receipt of each unique code received by a base station.
Claim 13
Dependent Claim
161 words
In navigation of a mobile station in the range of a pair of base stations, the method which comprises: a. sequentially transmitting from said mobile station pulse position sync codes, one unique to each said base station, b. sensing at each base station the sync code unique thereto, c. establishing a train of listening intervals at each base station in response to reception of its sync code while transmitting from each base station a common reply pulse position code, d. sensing said reply codes at said mobile station, e. in response to said reply codes transmitting a train of uniformly time spaced ranging pulses at a rate a multiple of the rate of said listening intervals, f. transponding a range reply pulse from said base stations upon receipt of response to successive range interrogation pulses in said train, and g. measuring the time interval between each range interrogation pulse and a range reply pulse from only one of said base stations.
Claim 14
Dependent Claim
161 words
In navigation of a mobile station in the range of a pair of base stations, the method which comprises: a. sequentially transmitting from said mobile station pulse position sync codes, one unique to each said base station, b. sensing at each base station the sync code unique thereto, c. establishing a train of listening intervals at each base station in response to reception of its sync code while transmitting from each base station a common reply pulse position code, d. sensing said reply codes at said mobile station, e. in response to said reply codes transmitting a train of uniformly time spaced ranging pulses at a rate a multiple of the rate of said listening intervals, f. transponding a range reply pulse from said base stations upon receipt of response to successive range interrogation pulses in said train, and g. measuring the time interval between each range interrogation pulse and a range reply pulse from only one of said base stations.
Claim 15
Dependent Claim
219 words
In synchronization of operations for a mobile station operating in the range of a set of base stations, the combination which comprises: a. means at said mobile station to transmit successive RF pulse position code sets, one uniquely related to each of said base stations and each set having a key pulse in the same position in all said sets, b. means to generate trains of time gates each bearing a known phase relation to a key pulse in one of said sets, c. means at said base stations to transmit back to said mobile station a reply pulse position code in response to receipt of one of said unique sets, d. means at said mobile station to generate a train of interrogation pulses in which pulses are synchronized with said time gates and in a known relation to a key pulse in said reply code, e. means at said mobile station responsive to the common reply pulse position code from the last of said base stations to initiate periodic transmission of range interrogation pulses from said mobile station, and f. counter means at said mobile station to enable said mobile station to sense range reply pulses sequentially to respond to only one range reply pulse from a base station for each ranging pulse transmitted from said mobile station.
Claim 16
Dependent Claim
219 words
In synchronization of operations for a mobile station operating in the range of a set of base stations, the combination which comprises: a. means at said mobile station to transmit successive RF pulse position code sets, one uniquely related to each of said base stations and each set having a key pulse in the same position in all said sets, b. means to generate trains of time gates each bearing a known phase relation to a key pulse in one of said sets, c. means at said base stations to transmit back to said mobile station a reply pulse position code in response to receipt of one of said unique sets, d. means at said mobile station to generate a train of interrogation pulses in which pulses are synchronized with said time gates and in a known relation to a key pulse in said reply code, e. means at said mobile station responsive to the common reply pulse position code from the last of said base stations to initiate periodic transmission of range interrogation pulses from said mobile station, and f. counter means at said mobile station to enable said mobile station to sense range reply pulses sequentially to respond to only one range reply pulse from a base station for each ranging pulse transmitted from said mobile station.
Claim 17
Dependent Claim
40 words
The combination set forth in claim 10 further comprising counter means at each base station for enabling said base station to respond only to range pulses received in predetermined phase relation to receipt of the unique code for said station.
Claim 18
Independent Claim
285 words
A system to assist navigation of a mobile station in the range of a pair of base stations which comprises: a. means at said mobile station to transmit successive unique RF pulse position code sets with a key pulse in each said set bearing a predetermined time relation to a timing series at said mobile station, b. means at a first of said base stations to transmit back to said mobile station a common reply pulse position code in response to one of said sets, c. means at said mobile station to initiate a timing pulse train in which the pulses are synchronized with said time series but bearing a predetermined relation to said key pulse in the code set received from said first station, d. means at a second of said base stations to transmit back to said mobile station a common reply pulse position code in response to a second of said sets, e. means at said mobile station to initiate a second timing pulse train in which the pulses are synchronized with said time series but bearing a predetermined relation to said key pulse in said second code set, f. means at said mobile station responsive to said timing pulse trains to establish a plurality of series of listening intervals, one for each base station, each of which have a predetermined time relation to the receipt at said mobile station of the key pulse in the common reply pulse position code from said first and second base stations, respectively, and g. means to measure the interval between transmission of a ranging pulse from said mobile station and receipt of the reply pulse from any base station during one of said listening intervals.
Claim 19
Independent Claim
285 words
A system to assist navigation of a mobile station in the range of a pair of base stations which comprises: a. means at said mobile station to transmit successive unique RF pulse position code sets with a key pulse in each said set bearing a predetermined time relation to a timing series at said mobile station, b. means at a first of said base stations to transmit back to said mobile station a common reply pulse position code in response to one of said sets, c. means at said mobile station to initiate a timing pulse train in which the pulses are synchronized with said time series but bearing a predetermined relation to said key pulse in the code set received from said first station, d. means at a second of said base stations to transmit back to said mobile station a common reply pulse position code in response to a second of said sets, e. means at said mobile station to initiate a second timing pulse train in which the pulses are synchronized with said time series but bearing a predetermined relation to said key pulse in said second code set, f. means at said mobile station responsive to said timing pulse trains to establish a plurality of series of listening intervals, one for each base station, each of which have a predetermined time relation to the receipt at said mobile station of the key pulse in the common reply pulse position code from said first and second base stations, respectively, and g. means to measure the interval between transmission of a ranging pulse from said mobile station and receipt of the reply pulse from any base station during one of said listening intervals.
References Cited (Backward Citations)
US3618089A
Cited
US3810179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |