The present invention discloses a receiving system and a method of processing data to receiving and processing mobile service data. According to one embodiment, during a first measurement cycle, spatial coordinates of multiple points on the wheel are obtained by positioning a vision sensor at various angular offsets relative to the wheel, the multiple points representative of samples from each of the various angular offsets. The present invention includes a pair of focusing members designed to transmit and uniformly focus a magnetic field across the magnetically sensitive device, wherein the focusing members are tailored to be substantially planar and provide a uniform magnetic field gradient across the magnetically sensitive device. The robust data message decoder is suitable for, but not limited to, applications in the aerospace industry, such as onboard network systems for advanced commercial and military aircraft. An intake passage is located in an area which is between the left and right frame members, above the bottom plate of the supporting box, and beside the battery. A sequential probability ratio test is used to statistically test the noisy status of a monitor and Shannon’s entropy theory is used to quantify the uncertainty levels of the monitor to support the use of the monitor values in fault isolation.