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بسم الله الرحمن الرحيم
اطلقت الصين من منصة الاطلاق الصينية [lc2] عبر مركبة [M2 ] القمرين [Zheng-3B] وهما من الاقمار الـ[35] المخصصة لنظام تحديد المواقع بيدو الصيني والمفترض ان يكون عاملا بالاقمار الخمس والثلاثين كاملة موقع الاقمار سوف تكون على ارتفاع [من 21 الف - اربع وعشرين الف كلم فوق الارض ] في زاوية 55 درجة . 
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A Chang Zheng-3B (Long March-3B) launch vehicle carrying two BeiDou-M navigation satellites lifted off from Launch Complex 2 (LC2) of the Xichang Satellite Launch Centre (XSLC) at local time 20:29 (12:29 GMT) on Saturday 25 July 2015. This is the third orbital launch conducted by China in 2015, and the second launch mission for the BeiDou Navigation Satellite System this year, following the launch of the Beidou 3-I1-S satellite on 30 March this year.
The two satellites are the second and third satellite for the Phase-III of the BeiDou programme, which will consist of 35 satellites operating in intermediate and geosynchronous orbits around the Earth to provide a global coverage of high-precision positioning and navigation services. The Phase-II of the programme was completed in 2012, with 10 satellites operating in high orbits to provide a regional coverage for customers in East Asia. Construction of the global network (Phase-III) officially began in 2015.
The BeiDou-M (with ‘M’ standing for the Medium Earth Orbit, or MEO) satellite is deployed in 21,500—24,100km, 55° inclination MEO (intermediate circular orbit). An experimental BeiDou-M satellite based on the DFH-3B bus was launched in April 2007 to test the onboard payload. The operational BeiDou-M satellite launched in this mission is based on a dedicated navigation satellite bus. The satellite has a gross mass of 850 kg and a payload capability of 300 kg. It is three-axis stabilised and has a power output of 1,500kW. The designed operational lifespan is 10 years.
The three-stage CZ-3B launch vehicle, which first entered service in 1996, is the most powerful launch vehicle in China’s current inventory, capable of delivering 5,200—5,500 kg payload to the geostationary transfer orbit (GTO). The launcher used in this mission was added with a Yuan Zheng-1 (YZ-1) upper stage, allowing the rocket to place two satellites into their orbits. The upper stage was first tested in the BeiDou 3-I1-S satellite in March on a CZ-3C rocket.
The two satellites are the second and third satellite for the Phase-III of the BeiDou programme, which will consist of 35 satellites operating in intermediate and geosynchronous orbits around the Earth to provide a global coverage of high-precision positioning and navigation services. The Phase-II of the programme was completed in 2012, with 10 satellites operating in high orbits to provide a regional coverage for customers in East Asia. Construction of the global network (Phase-III) officially began in 2015.
The BeiDou-M (with ‘M’ standing for the Medium Earth Orbit, or MEO) satellite is deployed in 21,500—24,100km, 55° inclination MEO (intermediate circular orbit). An experimental BeiDou-M satellite based on the DFH-3B bus was launched in April 2007 to test the onboard payload. The operational BeiDou-M satellite launched in this mission is based on a dedicated navigation satellite bus. The satellite has a gross mass of 850 kg and a payload capability of 300 kg. It is three-axis stabilised and has a power output of 1,500kW. The designed operational lifespan is 10 years.
The three-stage CZ-3B launch vehicle, which first entered service in 1996, is the most powerful launch vehicle in China’s current inventory, capable of delivering 5,200—5,500 kg payload to the geostationary transfer orbit (GTO). The launcher used in this mission was added with a Yuan Zheng-1 (YZ-1) upper stage, allowing the rocket to place two satellites into their orbits. The upper stage was first tested in the BeiDou 3-I1-S satellite in March on a CZ-3C rocket.
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