## 3 Results and Discussion
### Distributed Measurement System Design  
The major achievements of our work cover: considerations on a practical and important problem in occupational EMF exposure assessment using autonomous measurement systems; combining both numerical simulations and experimental validation of the studied cases to solve this problem using distributed multi-probes measurements; considerations covering comprehensive frequency range (100-3600 MHz) relevant to modern wireless systems; including statistical analysis of uncertainty reduction with multiple sensors developing practical recommendations for implementation of our conclusions in work environments.  
Major limitations of our study, which next steps are planned, consist in: limited coverage of numerical modelling using a single body model only; the considered exposure scenarios covering the far-field exposure scenarios only with preliminary experimental validation in two real exposure scenarios and with slow movements only; only brief suggestions regarding directions of practical implementation solving potential challenges in the real work environment  
Based on discussed research results and broader experience with various measurement techniques applied in evaluating EMF exposure in the work environment, considered practical problem may be summarize with suggestions on the structure and application of the multi-location measurement system designed for autonomous evaluation of workers exposure to RF EMF [35; 36]:  
Figure 11: The KDM ratio, presenting the discrepancy between the unperturbed E-field and the results of recordings of the E-field influenced by the proximity of the body, during the physical test measurements, to model distributed on-body measurement system by a combination of various locations of single multi-channel (narrowband) wearable probes on the body, where particular PEMs were located at: H—head, CF—chest front, CB—chest back): (**a**) 1 st exposure scenario with quasi-horizontal EMF propagation; (**b**) 2 nd exposure scenario with quasi-vertical propagation; the distribution of results in a particular frequency band are characterized by MMR—the range from minimum to maximum of the recorded values (bar), and the mean value (dot).  
distributed measurement system composed of 3 autonomous (battery supplied) omni-directional probes sensitive to E-field at relevant frequency bands - autonomous data logger ensuring the synchronised sampling of RMS E-field strength from all probes, with at least 1 Hz sampling frequency and sampling synchronization better than 10% of sampling rate - wireless communication between data logger and probes (to avoid safety hazards caused by cables connections of the measurements system components) or autonomous data logger in each probe - the weight and dimensions of data logger and probes low enough to allow data-logger and probe#1 to be fixed into the regular helmet required to be used by worker in many work environments (or \"measurement-helmet\" structure designed to be the core of the distributed measurements system and used by worker instead of the regular one) - the minimum capacity for the supplying system ensuring at least a shift-long autonomous measurement duration - the shape, size and weights of probes#2 and #3 suitable to carry (wear) them in the locations discussed in this paper, e.g., in pockets of workers' clothing (such as pockets of the special \"measurement-vest\") - the calibration and electromagnetic immunity of measurement system as required for the work place measurements (e.g., [37; 38])