**7. References**

112 Modern Telemetry

The requirements of time and memory for a script engine to run with multiple real-time tasks have been too great for its realization on an actual onboard computer so far. However, owing to recent technical advances, such a script engine can be installed in a spacecraft project. The author recommends T-Kernel as the OS kernel, which is expected to become a standard real-time OS, and JavaScript as the script engine to run on T-Kernel (Fukushima &

Most space systems can accept such commands that a software internal variable should be substituted by some value like "a\_hardware\_switch = 1". With the proposed script engine, it is possible to send commands by another form: an expression of a logic such as "IF a variable = value THEN do something", i.e., a program fragment. If space systems can accept a logic-type command, the system will have the capability to self-update dynamically; a script code sent by a logic-type command can modify the prescribed behaviours of the system. So far, software updates have only been achieved by stopping and reloading the entire software or by applying memory data patches on the running software code, despite the concern that these methods of updating have some risk of corrupting the system. Thus, such logic-type commands are clearly advantageous for our proposed software architecture.

Command Plan, JavaScript Library

Telemetry

Priority

RealTime OS(T-Ker) Deliberator JavaScript Engine

Hardware Interaction through Sensors and Actuators

actual satellite attitude sensor hardware failure was considered.

Fig. 17. A sample recommended implementation of the three-layer architecture for a remote system using a real-time OS with the deliberator that is realized by the help of a text-script engine, such as JavaScript, to provide onboard dynamic and self-update mechanism for

This chapter shows an experimental implementation of telemetry data processing to obtain a hidden event using a data mining technique. As a concrete example, detection of signs of

As preparation of treatment of practical data analysis commonly performed in satellite operations, a basic concept and practice of quantitative telemetry data analysis was demonstrated using REIMEI satellite data. By this preparation, the reader understood what the

ControlTask

CMD / TLM / PSM

Supports Control Modes

Hardware Access Interface

Sensor/ActuatorTask

Driver Device Driver

High

Low

Mita, 2011). Figure 16 depicts the proposed software architecture.

File

users.

**6. Conclusion** 


**Part 3** 

**Biomedical Telemetry**

