Look, I really don't think you have anything to worry about. When it comes down to it, Chris Roberts is probably the first person to use that style of emblem in a game. Specifically in his Wing Commander games, as it was the emblem that represented the terran confederation. Which was released in 1992 and the first game I personally saw the below emblem in those games was in Wing Commander III: Heart of the Tiger. Which was released in 1994. Coincidentally Chris Roberts is the same guy making Star Citizen.
Link to emblem: http://www.wcnews.com/newershots/full/morone7.jpg
And was featured prominently on the cover title for Wing Commander Prophecy: http://www.wcnews.com/newestshots/full/WCP.png
Copyright and IP for Wing Commander are owned by Electronic Arts.
But he was by no means the only nor last to use that or similar emblem as evidenced by yourself. Another game that I can think of just off the top of my head that used a similar emblem, and by coincidence, is far and away closer to your emblem (literally) is Pax Imperia: Eminent Domain which was released back in 1997.
Link to cover (emblem is in the middle embossed in gold... Emblem is also used as the game's executable icon image minus the outer solar rings) http://cs307511.vk.me/v307511577/8a76/7-4CUqdhJtE.jpg
Pax Imperia: Eminent Domain was developed by Heliotrope and published by THQ.
And these are just the examples I can think of off the top of my head. The thing is, that emblem has been used, modified, rehashed and recycled so many times, by so many people, over so many years, I doubt anyone could claim original ownership of it. Even if Roberts tried to claim original creation of it, EA could just claim ownership of it when they bought over Origin Systems and subsequently the Wing Commander IP. And then there would probably be someone else I even don't know about who could do the same citing even earlier examples, and so on. To be quite frank, I highly doubt you have anything to worry about. They most likely can't claim original ownership of that emblem, and neither could you really. It's just not a really original design. Hell if you really wanted to get to apples to oranges, the only one that could really complain about your emblem are the makers of Pax Imperia: Eminent Domain as theirs is almost a carbon copy of yours. But Heliotope went belly up years ago, and THQ (if you've kept up on the news) was liquidated over the last year and all of their IP's were auctioned off to lord knows who all. Aside from Homeworld which I know was sold to Gearbox Interactive. So again, I would say I don't think you have anything to worry about.