| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF | 
		
			| SJ 20920-2005 | English | 449 | 
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                    General specification for the ionospheric refraction correction system for exterior ballistic measurement by differential Doppler
                 | Valid | 
                    SJ 20920-2005
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