US3787844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio navigation system
Assignee: TDY Industries LLC
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Filing: 1973-01-08
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Granted: 1974-01-22
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Expires: 1993-01-08
Abstract
Abstract An improved iso-phase line-of-position navigation system for determining the position of a mobile station is disclosed which includes first and second transmitting base stations at respectively fixed locations and a third transmitting station positioned at a movable location. A mobile station is disclosed which includes a receiver for receiving signals from the two base stations and from the third station and means responsive to the signals received at the receiver for determining the position of the mobile station along first and second iso-phase lines-ofposition relative to the first and second base stations and the third station. Computing means are provided which are responsive to the position of the mobile station relative to the first and second base stations and the third station and also to the absolute location of the third station for computing the position of the mobile station.
Inventors
- 👤 C Hastings
- 👤 W Rounion
- 👤 A Comstock
- 👤 J Bradbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:28
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/30; G01S1/304; G01S5/00; G01S5/02; G01S5/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
178 words
An iso-phase line-of-position navigation system for determining the position of a mobile station, comprising: first and second base stations at respective fixed locations each including a transmitter for broadcasting signals at respective predetermined frequencies, a third station positioned at a movable location which includes a transmitter for broadcasting signals at a predetermined frequency, a first receiver for receiving said signals broadcast by said base stations and means responsive to said first receiver for determining the position of said third station relative to said base stations, a mobile station whose position is to be determined, said mobile station comprising a second receiver for receiving said signals broadcast by said base stations and said third station and means responsive to said second receiver for determining the position of said mobile station along a first iso-phase lineof-position relative to said first base station and said third station and along a second iso-phase line-of-position relative to said second base station and said third station, and computing means responsive to said first and second receivers for computing the position of said mobile station.
Claim 2
Dependent Claim
178 words
An iso-phase line-of-position navigation system for determining the position of a mobile station, comprising: first and second base stations at respective fixed locations each including a transmitter for broadcasting signals at respective predetermined frequencies, a third station positioned at a movable location which includes a transmitter for broadcasting signals at a predetermined frequency, a first receiver for receiving said signals broadcast by said base stations and means responsive to said first receiver for determining the position of said third station relative to said base stations, a mobile station whose position is to be determined, said mobile station comprising a second receiver for receiving said signals broadcast by said base stations and said third station and means responsive to said second receiver for determining the position of said mobile station along a first iso-phase lineof-position relative to said first base station and said third station and along a second iso-phase line-of-position relative to said second base station and said third station, and computing means responsive to said first and second receivers for computing the position of said mobile station.
Claim 3
Dependent Claim
51 words
The navigation system of claim 1 in which said third station is positioned on a vessel and in which said first and second base stations and said third station comprises a range-range iso-phase line-of-position navigation system for determining the position of said vessel relative to said first and second base stations.
Claim 4
Dependent Claim
74 words
The navigation system of claim 2 in which said third station further comprises position transmitting means for broadcasting signals indicative of the position of said vessel, said mobile station further comprises a third receiver for receiving said signals indicative of the position of said vessel and in which said computing means is positioned on said mobile station and receives inputs from said second and third receivers to compute the position of said mobile station.
Claim 5
Dependent Claim
136 words
The navigation system of claim 3 in which said range-range navigation system includes means for modulating the signals broadcast by each of said base stations with a respective modulation signal whose phase is a function of the range from said base station to said third station, said position transmitting means in said third station comprising means for transmitting said modulation signals as received at said third station and said third receiver comprises means for receiving said modulation signals from said base stations and from said third station and for comparing the phase of each of said modulation signals as received from said third station with the phase of the corresponding modulation signal as received from its respective base station, thereby indicating at said mobile station the range from said respective base station to said third station.
Claim 6
Dependent Claim
91 words
The navigation system of claim 1 which further comprises first recording means responsive to said first receiver for recording the position of said third station as a function of time, second recording means responsive to said second receiver for recording the position of said mobile station relative to said base stations and said third station as a function of time, and means for synchronously applying output signals from said first and second recording means to said computing means to provide the positiOn of said mobile station as a function of time.
Claim 7
Dependent Claim
35 words
The navigation system of claim 4 in which said means responsive to said second receiver determines the position of said mobile station relative to said base stations and said third station along hyperbolic iso-phase lines-of-position.
Claim 8
Dependent Claim
36 words
The navigation system of claim 4 in which said means responsive to said second receiver determines the position of said mobile station relative to said base stations and said third station along a halops iso-phase line-of-position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |