Position finding and collision avoidance system
First Claim
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1. Apparatus at an Own station within the service area of an SSR for determining the position of a transponder-equipped Other station within said service area, including at the Own station:
- a. means for receiving the interrogations transmitted by said SSR,b. means for geographically locating said SSR,c. means for receiving replies transmitted from said Other station in response to said interrogations,d. means for determining, from the time relationships between said received interrogations and said replies, data defining the position of said Other station with respect to the Own station in coordinates of differential azimuth (A),e. means for determining, from the time relationships between said received interrogations and said replies, data defining the position of said Other station with respect to the Own station in coordinates of differential time of arrival (T),f. means for determining the position of the Own station, andg. means for computing, from said data and the known positions of said SSR and said Own station, the position of said Other station.
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Abstract
A position finding and collision avoidance system derives, at an Own station within the service area of an identified SSr at a known location, differential azimuth (A), differential time of arrival (T), identity and altitude data regarding any transponder-equipped Other station or stations within a predeterminable region surrounding Own station, from standard ATCRBS interrogations and replies. These data are used to compute the positions of Other stations for display at Own station.
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Citations
12 Claims
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1. Apparatus at an Own station within the service area of an SSR for determining the position of a transponder-equipped Other station within said service area, including at the Own station:
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a. means for receiving the interrogations transmitted by said SSR, b. means for geographically locating said SSR, c. means for receiving replies transmitted from said Other station in response to said interrogations, d. means for determining, from the time relationships between said received interrogations and said replies, data defining the position of said Other station with respect to the Own station in coordinates of differential azimuth (A), e. means for determining, from the time relationships between said received interrogations and said replies, data defining the position of said Other station with respect to the Own station in coordinates of differential time of arrival (T), f. means for determining the position of the Own station, and g. means for computing, from said data and the known positions of said SSR and said Own station, the position of said Other station. - View Dependent Claims (2, 3, 4, 5, 6)
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7. The method of determining, at an Own station within the service area of an SSR, the position of a transponder-equipped Other station within said service area, including the steps of:
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a. receiving the interrogations transmitted by said SSR, b. geographically locating said SSR, c. receiving replies transmitted from said Other station in response to said interrogations, d. determining, from the time relationships between said interrogations and said replies data defining the position of said Other station with respect to the Own station in coordinates of differential azimuth (A), e. determining, from the time relationships between said received interrogations and said replies, data defining the position of said Other station with respect to the Own station in coordinates of differential time of arrival (T), f. determining the position of the Own station, and g. computing, from said data and the known positions of said SSR and said Own station the position of said Other station. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification