Helicopter satellite communication system, helicopter-mounted communication apparatus, terrestrial station communication apparatus, communication method, and non-transitory computer-readable recording medium storing computer program
US9319128B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2013 |
| Grant date | Apr 19, 2016 |
| Priority date | — |
| Expiry date | May 3, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A helicopter-mounted communication apparatus encodes video data at a compression rate based on a percentage of time a transmission beam is blocked by rotor blades. When a number of video packets is less than a specified number, the helicopter-mounted communication apparatus inserts null packets to keep a packet rate constant, then deletes the null packets and attaches additional information to another packet indicating the number of deleted null packets, and after buffering modulates and transmits a signal toward a communication satellite at transmittable-time points. A terrestrial station communication apparatus receives and demodulates the transmitted signal via the communication satellite, generating a packet stream, and based on the additional information included in the generated packet stream, inserts null packets in the packet stream and buffers the packet stream, thereby keeping the packet rate constant, and then separates the video packets from the packet stream and decodes the separated video packets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.