Asynchronous sensor planning service chain driven dynamical satellite sensor information retrieval

In a Sensor Web environment, sensors are heterogeneous. The Sensor planning service offers a standardized interface for the control of sensors and simulations. But some complex sensors like satellite need midterm or long-term action to response a given task, so, adding asynchronous support in SPS is necessary. The workflow description language can chain asynchronous web service together while it has to contend with the complex and specific communication mechanism of asynchronous SPS. In order to achieve asynchronous SPS, the Asynchronous Sensor Planning Service Chain (ASPSC) is proposed in this paper. The internal message exchange and external callback invocation method is used to serve dynamical retrieval service of satellite planning information under Sensor Web environment through the chaining of SPS operation. The proposed method has been successfully demonstrated in application scenarios for Simplified General Perturbations Satellite Orbit Model 4(SGP-4). It can service most near earth satellites and offers an automatic sensor information retrieval. Comparing to the traditional SPS, it is more flexible and strength in software architecture.