Thermal battery usually has two types of activation： no-load activation and on-load activation. At present， the thermal battery with load activation is a common activation mode in flight test. The internal resistance changes rapidly from large to small in a short time when it is activated.and the effect of this change on the system power supply has not been reported.. This paper introduces the basic characteristics and working principle of the thermal battery， focusing on the activation mechanism and the possible impact on the system power supply. The resulting problems of system power supply in the test are analyzed and summarized， and several referenceable solutions are provided， which are simple， effective and easy to implement in engineering.

Aiming at the decision-making problem of beyond visual range （BVR） air combat， a decision rule tree model that integrates prior knowledge of tactical implementation distance with evolutionary iteration capabilities is established. The mechanism of air combat victory is analyzed， the BVR air combat situation model and the tactical implementation distance model are established， the BVR air combat factors are introduced and the posture assessment model and the set of decision variables are established； the BVR air combat tactical action decomposition and the construction of the action library are implemented； the BVR air combat Decision tree are established， a new particle swarm optimization method based on dynamic adjustment of inertia weights and chaotic optimization is proposed to improve the evolution efficiency realization of the decision rule tree； based on the simulation experiment， the decision effect analysis of the evolutionary decision tree under different conditions is given. The simulation results show that the evolutionary decision tree proposed can effectively integrate a priori knowledge of tactical implementation distance， missile strike zone， etc.， and has the evolutionary capability to effectively solve the BVR tactical decision problem.

In order to satisfy impact angle constraints and reduce energy cost under salvo attacks against high-speed non-maneuvering targets， a three-dimensional coupled model is established， and a 3D energy optimal guidance law for non-linear systems with large constrained impact angles is proposed. The reasons for the low accuracy of 3D decoupled model are discussed， and a 3D coupled model is established. Based on this model， the appropriate control variables are chosen， and the 3D energy optimal guidance law under large impact angle constraints is derived， based on minimum principle. Experimental results indicate that the performance of the proposed coupled model on miss distance， impact angle error and energy cost has improved 0.7 m，1.1°，200 g compared with decoupled model. It can prove the advantages of the guidance law on control precision and energy cost.