According to an article in Xinhua on September 7, 2012, by 2020, China will be able to monitor its maritime territories completely through remote satellite sensing. The article reported that China plans to launch eight new satellites in the next 8 years so as to strengthen its maritime surveillance of the South and East China seas including the Diaoyu islands (also called the Senkaku Islands) in the East China Sea and Huangyan Island (Scarborough Shoal) in the South China Sea.
Source: Xinhua, September 7, 2012
http://news.xinhuanet.com/mil/2012-09/07/c_123687799.htm