Abstract
This paper describes an evolutional long delay wave measuring apparatus for measuring delay profiles and levels accurately in the single frequency network (SFN) used for terrestrial digital TV broadcasting.Measurable delay times using the conventional scattered pilot (SP) signal method are theoretically restricted to less than 0.5ms.This equipment has no limit to the length of delay times it can measure. We fabricated and tested a proto type and confirmed that it can be used to measure delay profiles with delay times longer than 1ms.In addition, we discuss errors that occurred when using this method and the countermeasures that were taken.Performance was satisfactory. In the future, this apparatus will be effective for achieving coverage with excellent quality following the construction of a new relay station that will expand SFN. In addition,it will be effective for electric field strength measurements taken during maintenance and it will assist in the efficient operation of SFN by its ability to confirm the quality of coverage.
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