To　tackle　the　difficulty　in　tuning　the　parameters　of　sliding　mode　differentiator　(SMD),　an　improved　adaptive　notch　filter　based　real-time　parameter　tuning　scheme　(denoted　as　ANFSMD)　is　presented.　Specifically,　the　integral　feedback　of　the　system　output　errors　is　introduced　in　constructing　the　cost　function　for　the　adaptive　notch　filter　so　as　to　estimate　the　real-time　amplitude　and　frequency　of　given　inputs.　Then,　upon　the　deterministic　formula　between　the　parameters　of　the　SMD　and　the　input　signals,　the　parameters　of　the　SMD　can　be　adjusted　adaptively　as　inputs　vary.　Simulation　results　show　that　the　proposed　ANF-SMD　scheme　performs　well　in　signal　filtering　and　differentiation　estimation.　The　effectiveness　of　the　proposed　ANF-SMD　is　further　experimentally　verified　on　the　pressure　signal　processing　for　the　altitude　ground　test　facility.