SPECTRUM DIFFUSION SIGNAL DEMODULATING DEVICE

摘要

PROBLEM TO BE SOLVED: To capture reception wave surely and in a short time. SOLUTION: A carrier NCO 8 and exclusive OR circuits 6 and 7 eliminate carrier components out of spectrum diffusion signal received with an antenna 1, and digital correlators 10 and 11 compare the signal from the exclusive OR circuits 6 and 7 and signal having C/A code (carrier and sign) from a C/A code generator 9 and correlation value of both signals is measured. A controller 12 determines a reception level based on the sum of the correlation values measured a plurality of times and compares with a threshold value. When the reception level is larger than the threshold value, it is judged that the capture of the received wave is successful.