Disclosed is an automated trip-purpose detection method that utilizes GPS Data collected by GPS-enabled devices. This membrane system includes a first-stage membrane such as a membrane prepared from the polymer of intrinsic microporosity to selectively remove hydrocarbons from C3 to C35 to control the dew point of natural gas, and a second-stage membrane such as a polybenzoxazole or crosslinked PBO membrane to selectively remove CO2 from natural gas. A cathode section and anode section for generating discharge are arranged in the sealed vessel. Each port includes multiple queues. Also, the use of the second photocell separate from the image sensor can reduce data computational complexity of the shutter control signal controller in the image processor, thus reducing current consumption in the image processor.