Patent ID: 8311164
Filing Date: 2012-11-13
Classification: G01S,H04B,H04L

Abstract:
1. A correlation apparatus for tracking a satellite signal, comprising: a code generator for generating a Pseudo Noise (PN) code; a shifter for generating a Prompt signal corresponding to the PN code, a plurality of Early signals having a chip interval earlier than that of the Prompt signal, and a plurality of Late signals having a chip interval later than that of the Prompt signal; a multiplexer for outputting at least one of the plurality of Early signals and at least one of the plurality of Late signals; a code mixer for mixing the satellite signal with the Early signal and the Late signal output from the multiplexer; an accumulator for acquiring a correlation signal by integrating the signals output from the code mixer; and a mode controller controlling the multiplexer so that the multiplexer outputs by selecting one of a chip interval of ½ Early/Late signals and ¼ Early/Late signals provided by the mode controller, a clock generator for generating a reference frequency for generating the PN code, and a multiple frequency for generating the plurality of Early signals and the plurality of Late signals; wherein the shifter outputs every other one of the plurality of Early signals and outputs every other one of the plurality of Late signals, and wherein the plurality of Early signals comprises the ½ Early signal and ¼ Early signals and the plurality of Late signals comprises the ½ Late signal and ¼ Late signal.