| Patent Number |
Title Of Patent |
Date Issued |
| RE29260 |
Proximity indication with range and bearing measurements |
June 7, 1977 |
| Proximity indication and evaluation for aircraft, using only the signals emitted by secondary surveillance radar and cooperating transponders, to detect intrusion in a monitored proximity volume and determine slant range and relative bearing to the intruder. |
| 5198823 |
Passive secondary surveillance radar using signals of remote SSR and multiple antennas switched |
March 30, 1993 |
| The range from which transponder replies can be received at a virtual secondary surveillance radar of the type described in U.S. Pat. No. 4,115,771 is extended by replacing the omnidirectional antenna previously utilized to receive replies from transponders within the range of the SSR |
| 5196856 |
Passive SSR system utilizing P3 and P2 pulses for synchronizing measurements of TOA data |
March 23, 1993 |
| The range from which a collision avoidance system at an Own station can receive SSR interrogations and reply messages from Other stations, is extended by utilizing P2 pulses for timing TOA measurement in the event P1-P3 pulse pairs are unavailable from the scanning main beam or its side |
| 4789865 |
Collision avoidance system |
December 6, 1988 |
| The operation of a positive finding collision avoidance system at an Own station that determines Own's and Others' positions from SSR interrogations and replies thereto is initialized by briefly transmitting interrogations from Own station and receiving non-garbled replies thereto fr |
| 4768036 |
Collision avoidance system |
August 30, 1988 |
| A position-finding collision avoidance system (CAS) at an Own station within the service areas of at least two identified SSRs at known locations derives differential azimuth (A), differential time of arrival (T), identity and altitude data regarding one or more transponder-equipped |
| 4733241 |
Position finding and collision avoidance system |
March 22, 1988 |
| 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 statio |
| 4642648 |
Simple passive/active proximity warning system |
February 10, 1987 |
| A simple active/passive proximity warning system for an Own station that uses differential time of arrival values, direct time of arrival values, and differential altitude values determined from 1030 MHz interrogations from ground-based SSRs and Own station and 1090 MHz transponder repli |
| 4486755 |
Collision avoidance system |
December 4, 1984 |
| A threat warning collision avoidance system at an Own station that produces pseudo range data, identity and, when available, differential altitude data from standard ATCRBS interrogations and Other station's replies, rejecting the identity and data from Other stations that are outside a |
| 4115771 |
Passive ATCRBS using signals of remote SSR |
September 19, 1978 |
| A virtual secondary surveillance radar (SSR) is provided at any desired location within the coverage area of an actual SSR by receiving the interrogations from the actual SSR and the transponder replies thereto. The received signals are processed to yield information as to the positi |
| 4027307 |
Collision avoidance/proximity warning system using secondary radar |
May 31, 1977 |
| Proximity indication and evaluation of mobile vehicles, using the signals emitted by the hundreds of existing secondary radar ground stations and the nearly 100,000 cooperating transponders on the vehicles, to detect intrusion in a monitored proximity volume and to determine slant range |
| 4021802 |
Collision avoidance system |
May 3, 1977 |
| A collision-predictive CAS at a protected station or vehicle that produces TAU data relating to differential azimuth and/or TOA from standard ATCRBS interrogations and replies, and selects the largest closing TAU signal of a threatening Other station to provide reliable warning while min |
| 3959793 |
Proximity indication with means for computing the distance from an own station to an interrogati |
May 25, 1976 |
| A method and apparatus for determining the distance to a secondary surveillance radar (SSR) station from an own transponder station when another transponder station lies within a monitored region surrounding the own station. The distance information is utilized to modify the operating |
