Dubbed multi-static primary surveillance radar, the system has several benefits.

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We should expect that more capable follow-on to the SC-19 anti-satellite weapon will allow the PLA to target even higher orbit satellites, like our critical GPS navigation and radar surveillance satellites.

CENTERFORSECURITYPOLICY: China's one world?

Space debris is tracked by the United States Space Surveillance Network that uses radar that can detect an object the size of a pea at 400 miles.

BBC: By BBC News Online Science Editor Dr David Whitehouse

That makes Raytheon, which produces missiles, defence electronics, radar and ground surveillance systems, especially attractive.

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The latest version has new sensor capabilities, employing Multi-Platform Radar Technology for improved surveillance .

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Each Global Hawk has infra-red and radar sensors, and a surveillance range of 100 miles.

ECONOMIST: Unmanned aircraft

By incorporating a commercial radar (the Cerberus Scout surveillance system), target detection reached 100 percent.

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We need use of radar, drones, electronic surveillance.

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China has an initial electro-optical and radar satellite constellation that will this year be joined by Russian-designed surveillance satellites.

CENTERFORSECURITYPOLICY: China's one world?