Northrop Third-Quarter Profit Rises  NEW YORK (Reuters) - Northrop Grumman Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=NOC.N target=/stocks/quickinfo/fullquote"&gt;NOC.N&lt;/A&gt;  reported higher third-quarter earnings on Wednesday and an 11  percent increase in sales on strength in its mission systems,  integrated systems, ships and space technology businesses.