Context: The BeiDou Navigation Satellite System (BDS, simplified Chinese: 北斗卫星导航系统; traditional Chinese: 北斗衛星導航系統; pinyin: Běidǒu wèixīng dǎoháng xìtǒng) is a Chinese satellite navigation system. It consists of two separate satellite constellations – a limited test system that has been operating since 2000, and a full-scale global navigation system that is currently under construction.

Question: What is the BeiDou Navigation Satellite System?
Answer: a Chinese satellite navigation system

Question: How many satellite constellations does the BeiDou Navigation Satellite System have?
Answer: two separate satellite constellations

Question: What are the two satellite constellations?
Answer: a limited test system that has been operating since 2000, and a full-scale global navigation system

Question: How long has the limited test system been operating?
Answer: since 2000

Question: How is the BeiDou Navigation Satellite System written in traditional Chinese?
Answer: 北斗衛星導航系統

Question: What is the Limited Navigation Satellite System?
Answer: Unanswerable

Question: The BeiDou Navigation Satellite System consists of 3 separate what? 
Answer: Unanswerable

Question: What type of system has been operating since 2010?
Answer: Unanswerable

Question: Which system is no longer under construction?
Answer: Unanswerable