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The radio fuze will be out of order easily because of small size and high integration. In order to improve the testability, an effective method to achieve rapid detection and fault isolation is to determine reasonable test-sets and a best diagnosis strategy. Based on the functional block diagram, a fault message matrix among every module of inner radio fuze is built and some optimum test-sets are chosen by resolving the matrix gradually. In the end, a optimal diagnosis strategy is confirmed. It shows that the purpose of fault detection is achieved by using the method given by the paper quickly. The fault diagnosis strategy can also apply to automated testing and fault isolation decision-making for other micro- electromechanical system.

A model of photodetector was established, and the expression of the interference to the photodetector caused by sunlight directly propagating into the detector was given. With integrals over area elements, the filling of the view field of the photodetector by the ground was discussed in detail. The expression of the interference to the photodetector caused by sunlight scattered by the ground was deduced. The research presented in this paper is a contribution to the application of photodetectors.

With the development of semiconductor laser technology, laser proximity fuzes have been widely used in various kinds of guided missiles and routine ammunitions. An approach to pulsed laser fuze based on pseudorandom code is presented in this paper. Based on the principle of laser fuze using pseudorandom code, the system has been divided into emitting module, receiving module, optical system and information processing module. The different modules have been analyzed in details and principles for selecting the parameters of the modules are given. The testing shows that laser fuze based on pseudorandom code has a better ability of detection and a higher resistance to interference. The theoretic foundation is provided for scientifically designing pulsed laser fuze of pseudorandom code.

Laser ranging is to measure the distance of a target with laser beam. Having the advantages of narrow beam and strong resistance to electromagnetic interference, it has been developed and researched by many countries. Because of the complexity of backgrounds and targets, it is necessary to research the related laser echo characteristics. The power, waveform and other identities of laser pulse echo from targets are analyzed based on the experimental results of the laser ranging system. Valuable conclusions were drawn for the laser echo characteristics for different materials.