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Double threshold detection based on constraint judgment is proposed for micro-seismic signal detection. The improvement effect on Probability of False Alarm and influence on Probability of Detection are quantitatively analyzed with constraint judgment. The mathematical models of total PFA and PD of double threshold detection based on constraint judgment are built, and the validity of the mathematical model is verified by simulation tests and experiments. The results show that the signal-to-noise ratio under scheduled PFA and PD Call be decreased by introducing constraint judgment to double threshold detection, and improve the identification accuracy of micro-seismic signal.

As the core of automotive engine control system, carrying out intelligence research for ECU’s own intellectual property rights is necessary. In the foundation of combining domestic actual and analysis and summary to the existing system, we propose the design proposal of motor car engine intelligence electron controller based on CANBUS, and exposit how the factors of human, automobile, environment and so on to be coordinated to achieve optimal performance of overall system. By computer communication and network technology, seamlessly integration of GPS navigation system, radio telephone and bus distributed network can be realized, which enables the entire automobile electron system have the ability of data fusion, failure diagnosis and certain self-repair ability. ECU has huge potential commercial profit, because it uses field bus technology so that cable quantity in automobile was reduced greatly, and the field bus uses pure digital technique so that many measuring appliances and equipments can be connected on single electric cable to transmit more information, in addition, it has stronger interference immunity, lower cost of installment, running and maintenance. This system can coordinate with transportation automatic monitoring visual system, and it’s the key link to realize intelligence transportation system.

The characteristics of mechanical gyroscope are high technology, complicated structure and restrict precision. Basing on this aspect, MEMS gyroscopes and accelerometers are adopted as the inertial measurement unit in this paper. S3C2440 of the ARM9 series is taken as the micro processing chip to design a system of north seeking to complete measurement, transmission, and processing and so on. MEMS sensor can reduce the influence from external environment factors on the north-seeking accuracy. ARM chips can finish collecting data and processing effectively, while the system structure could be achieved easily.