In the position and azimuth determination system (PADS), the bias and scale factor of a quartz flexible accelerometer exhibit a non-ignorable drift after a quick turn-on and before the thermal balance is reached inside the system at different temperatures. To solve this problem, this paper presents a system compensation scheme. The multi-point temperature sensing experiment was repeated based on the realization of the hardware platform, and a wavelet neural network was used for the temperature compensation. Studies indicated that the selection of the temperature sensing points is one of the keys to achieve an effective compensation. Results show that the compensation scheme and algorithm increase the efficiency and reduce the preparation time; meanwhile the attitude precision can be improved to 8 arcsec, which meets the specification of the system.
Land resources and water resources are the important material basis of economic and social development, and their pattern determines the pattern of development. Based on the panel data of the Chengdu–Chongqing Economic Circle from 2011 to 2018, this paper evaluates the matching degree of water and land resources, and their respective matching degrees with the economic development in the Chengdu–Chongqing Economic Circle with the Gini coefficient method. Based on the two-way fixed effect model, an extended Cobb–Douglas production function model is established to analyze the sensitivity of economic growth to land and water factors. In addition, the restriction degree of water and land resources to the economic development of the Chengdu–Chongqing Economic Circle is measured quantitatively by using the growth damping coefficient. The results show that the water and land resources and economic development of the Chengdu–Chongqing Economic Circle have a high matching degree, but the inner cities have a great difference. The contribution of water resources to economic growth is greater than that of land resources. Both of them have a little growth drag, which shows that industrial development has disposed of the dependence of water and land resources. The development of the Chengdu–Chongqing Economic Circle needs to play the role of technological progress in promoting economic growth, and at the same time optimize the use of water and land resources to reduce its constraints on the economic growth. Finally, the policy suggestions of matching water and land resources and economic growth in different regions are put forward.
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