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"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 5223847 | Pilot warning system This invention relates to a system to alert an aircraft pilot of presence and general location of other aircraft that might constitute a collision threat to the pilot's aircraft. An antenna means operates in first and second modes characterized by respect... | 06/29/1993 |
| 5202684 | System of an aircraft collision avoidance system for suppressing useless alarms The present invention is concerned with a system in which when the altitude of a subject aircraft becomes lower than a predetermined altitude, a warning limit value is reduced or made equal to zero on the minimum altitude side whereby a useless alarm base... | 04/13/1993 |
| 5157615 | Aircraft traffic alert and collision avoidance device A passive aircraft Traffic alert and Collision Avoidance Device (TCAD) is based on sensing and responding to transponder replies of other aircraft to SSR interrogations. In order to avoid masking other aircraft replies by the host transponder TCAD repeate... | 10/20/1992 |
| 5153836 | Universal dynamic navigation, surveillance, emergency location, and collision avoidance system and method A craft tracking and collision avoidance system is disclosed. The system allows the positions of a plurality of craft, either on land, sea, or air, or space, to be monitored. Each craft determines its own position using an existing position determining sy... | 10/06/1992 |
| 5089822 | Interrogation signal processor for air traffic control communications The present invention is directed to a Mode S uplink or interrogation signal demodulation system which can quickly recognize the Mode S signal and also filter out of noise present in the Mode S uplink or interrogation signal, thereby reducing the bit erro... | 02/18/1992 |
| 4856100 | Reply rate limiting Transponder reply rate limiting employing a circular memory queue to store the times of prior responses up to the limits of circular memory queue capacity. Separate circular memory queues contain the times of (1) long replies, and both (2) long or short r... | 08/08/1989 |
| 4853700 | Indicating system for warning airspace or threatening aircraft in aircraft collision avoidance system The present invention relates to a indicating system for warning airspace or threatening aircraft in aircraft collision avoidance system which provides simply and inexpensively information required for safe cruising of aircraft with respect to range of wa... | 08/01/1989 |
| 4839658 | Process for en route aircraft conflict alert determination and prediction A process is provided for establishing when selected pairs of airborne aircraft are in en route conflict or are in potential en route conflict. The process includes a number of "filtering" steps arranged in three branches. At each step, different conditio... | 06/13/1989 |
| 4835537 | Telemetry burst collision avoidance system An aircraft collision avoidance system providing warning and avoidance manuevers for all fixed and moving obstructions that threaten the safe navigation of the host aircraft. The system is effective against threatening aircraft, runway maintenance vehicle... | 05/30/1989 |
| 4364049 | Radar transponders An interrogator/transponder for identification of co-operating pulse radar-fitted marine vessels comprises a detector responsive to signals in the radar frequency band and a C-band transmitter/receiver connected such that on receiving a C-band interrogati... | 12/14/1982 |
| 4139848 | Aircraft proximity warning indicator An aircraft proximity warning indicator incorporating an RF receiver, optical sensor, and display is described which may receive an RF signal followed by an optical radiation pulse from another aircraft where the received RF signal is used to control the ... | 02/13/1979 |
| 4072943 | Multi-target tracker A digital tracker in a cooperative collision avoidance system utilizing time division techniques, which is capable of generating track gates and determining critical values of tau (time to collision) for at least 16 targets during the same time frame, the... | 02/07/1978 |
| 4067010 | Circuit for inhibition of autogenetic false alarms in a collision avoidance system In a cooperative collision avoidance system, probe signals are inhibited for a predetermined time period to prevent autogenetic false alarms, that is, false replies to one's own interrogation probes.... | 01/03/1978 |
| 4052721 | Multi-target tracker for tracking near co-range targets A digital tracker in a cooperative collision avoidance system capable of generating track gates and determining critical values of tau (time to collision) for at least 16 targets and to determine the presence of two targets of substantially similar ranges... | 10/04/1977 |
| 4016564 | Multiple target data receiver for a collision avoidance system In an interrogation vehicle, a receiver of data from a plurality of remote vehicles such as aircraft or maritime vessels in a cooperative collision avoidance system is arranged to receive such data reply signals in reply to interrogation signals. The repl... | 04/05/1977 |
| 4008471 | Correlator to reduce bin straddle in a collision avoidance system In a cooperative collision avoidance system the detected reply signals to interrogation probe signals are correlated by a digital circuit that processes all the reply signals identifying targets over non-targets ("fruit"). The correlator is capable of det... | 02/15/1977 |
| 3947845 | Altitude coding for collision avoidance system In a cooperative collision avoidance system for aircraft, an altitude encoding system serves as a discriminant to insure orderly sequence of data exchange between cooperative aircraft, particularly, in a dense traffic environment. The system includes mean... | 03/30/1976 |
