Purpose
The selection of a suitable inertial measurement unit (IMU) is a critical step in an inertial navigation system (INS) design. Nevertheless, inertial sensors manufacturers are unwilling to publish their products’ accurate performance parameters along with a price. This paper aims to summarise the current IMU market review and point out parameters important for short-term inertial navigation.
Design/methodology/approach
The market review is based on the information published by manufacturers in brochures, datasheets and websites. Some information, including price, was also collected from sensors distributors. The entire collection of data includes data of over 150 sensors from 32 manufacturers and is valid for the first half of the year 2020.
Findings
This paper answers the following questions: •Why and where use inertial navigation? •Which parameters should one emphasise during IMU selection?•What is currently available on the IMU market? •Which parameters have a significant influence on price? •What are the advantages of specific sensor technology?
Originality/value
This paper gathers data published by IMU manufacturers, allowing for a quick overview of the current market. Based on real data, different sensor technologies are compared. The performed analysis presents the statistical basis for the IMU selection. By theoretical considerations a significance of sensor parameters is drawn and an approach to an IMU selection based on limited number of parameters is proposed. Although the considerations have been carried out regarding inertial navigation, the results from an extensive analysis of commercially available sensors may also be useful for other applications.
In the present study 75 patients were double blind randomized either to receive 10 mg propranolol orally 4 times a day (35 patients) or a placebo (40 patients). Episodes of clinically important supraventricular tachyarrhythmias were recorded in the first 4 postoperative days. They appeared in 5 of 35 patients receiving propranolol and in 5 of 40 patients receiving placebo (no statistically significant difference). In conclusion this study indicates the need for further evaluation to clarify if low-dose propranolol or any other drug is effective in reducing the frequency of SVT in the early postoperative period after coronary artery bypass surgery.
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