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This paper analyzes that the global positioning system (GPS) receiver differential code bias (DCB) has effect on the estimation\udthe ionosphere total electron content (TEC). The data from nine permanent GPS sites of the Korea Astronomy\udand Space Science Institute (KASI) were used for the estimation of the receiver DCB before (Trimble 4000 SSi) and after\ud(Trimble NetRS) the receiver replacement, using the singular value decomposition method. The results showed that\udthe estimated mean value of the receiver DCB varied from 0.11 ns (nanosecond) to 7.54 ns before the receiver replacement,\udbut the receiver DCBs shoed large values than 20 ns except some stations after the replacement. The receiver DCB\udshowed a relatively large difference by types of the receivers, and, as a result, it had a great effect on the estimation the\udionosphere TEC using GPS

Receiver DCB Estimation and Analysis by Types of GPS Receiver