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US5572214A
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Apparatus and method for frequency space modeling
Assignee: Unisys Corp
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Filing: 1995-05-04
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Granted: 1996-11-05
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Expires: 2015-05-04
Abstract
Abstract This is a computer-implemented model for the frequency space utilized by the Mode Select Beacon System (the Mode S system) for air traffic surveillance and control. The model simulates the operation of interrogators, transponders, and receivers, and calculates the probability of interference between transponder reply signals using a sliding window.
Inventors
- 👤 Emanuel I. Ringel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:49
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/01; G01S19/13; G01S19/14; G01S19/15; G01S13/00; G01S13/74; G01S13/76; G01S13/765; G01S13/88; G01S13/91
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
167 words
A method for simulating the operation of interrogators, transponders and receivers, comprising the steps of: (a) specifying the number of reply signal(s) per transponder; (b) setting the number of transponders to zero; (c) incrementing the number of transponders by a fixed amount; (d) defining the positions of the interrogators and the transponders; (e) determining the number of transponder replies over a predetermined interval; (f) determining whether the correct number of reply signals per interrogator has been found in step (e); (g) using a sliding window for determining probability in the following steps; (h) determining the probability of interference between one type of transponder reply signal and a regularly repeated transponder signal; (i) determining the number of a second type of transponder reply signal over the predetermined interval; (j) determining the probability of interference between the second type of transponder reply signal and the regularly repeated signal; and (k) from the results of steps (h) and (j) determining the overall probability of interference with the regularly repeated signal.
Claim 2
Independent Claim
167 words
A method for simulating the operation of interrogators, transponders and receivers, comprising the steps of: (a) specifying the number of reply signal(s) per transponder; (b) setting the number of transponders to zero; (c) incrementing the number of transponders by a fixed amount; (d) defining the positions of the interrogators and the transponders; (e) determining the number of transponder replies over a predetermined interval; (f) determining whether the correct number of reply signals per interrogator has been found in step (e); (g) using a sliding window for determining probability in the following steps; (h) determining the probability of interference between one type of transponder reply signal and a regularly repeated transponder signal; (i) determining the number of a second type of transponder reply signal over the predetermined interval; (j) determining the probability of interference between the second type of transponder reply signal and the regularly repeated signal; and (k) from the results of steps (h) and (j) determining the overall probability of interference with the regularly repeated signal.
Claim 3
Dependent Claim
21 words
A method as defined in claim 1 wherein step (d) comprises randomly defining the positions of the interrogators and the transponders.
Claim 4
Independent Claim
170 words
An apparatus for simulating the operation of interrogators, transponders and receivers, comprising: (a) means for specifying the number of reply signal(s) per transponder; (b) means for setting the number of transponders to zero; (c) means for incrementing the number of transponders by a fixed amount; (d) means for defining the positions of the interrogators and the transponders; (e) means for determining the number of transponder replies over a predetermined interval; (f) means for determining whether the correct number of reply signals per interrogator has been found in step (e); and (g) sliding window means for determining the probability of interference between transponder reply signals, comprising: (1) means for determining the probability of interference between one type of transponder reply signal and a regularly repeated transponder signal; (2) means for determining the number of a second type of transponder reply signal over the predetermined interval; and (3) means for determining the probability of interference between the second type of signal of means (2) and the regularly repeated signal of means (1).
Claim 5
Independent Claim
170 words
An apparatus for simulating the operation of interrogators, transponders and receivers, comprising: (a) means for specifying the number of reply signal(s) per transponder; (b) means for setting the number of transponders to zero; (c) means for incrementing the number of transponders by a fixed amount; (d) means for defining the positions of the interrogators and the transponders; (e) means for determining the number of transponder replies over a predetermined interval; (f) means for determining whether the correct number of reply signals per interrogator has been found in step (e); and (g) sliding window means for determining the probability of interference between transponder reply signals, comprising: (1) means for determining the probability of interference between one type of transponder reply signal and a regularly repeated transponder signal; (2) means for determining the number of a second type of transponder reply signal over the predetermined interval; and (3) means for determining the probability of interference between the second type of signal of means (2) and the regularly repeated signal of means (1).
Claim 6
Dependent Claim
23 words
An apparatus as defined in claim 3 wherein means (d) comprises means for randomly assigning the positions of the interrogators and the transponders.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-11-05 | 2000-05-06 | 2000-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-05 | 2004-05-06 | 2004-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-05 | 2008-05-06 | 2008-11-05 | $7700.00 | Window Closed / Lapsed |