A wander generator has a random number signal generator unit, a filter unit, a clock generator unit, a modulator unit, and a setting unit. The apparatus includes a determination unit for determining whether or not the adjacent sub-carrier, is a null sub-carrier and a smoothing unit for smoothing the transmission line characteristic estimation value of the target sub-carrier by excluding the transmission line characteristic estimation value of the adjacent sub-carrier determined as a null carrier by the determination unit. The seal assembly is mounted around the body on opposite sides of the wheel rim wall and abuts the flange on the body. In one embodiment, the second phase may contain a thermoplastic elastomer, a glycol-modified polyethylene terephthalate, or a polyamide and may have a melting point that is higher than the melting point of the polyoxymethylene polymer. A filter for suppressing the interference element is applied on the short time data from the estimated arrival azimuth of the interference element so as to suppress the interference element.