| 摘要 |
PURPOSE:To attain stable synchronization locking by counting number of extraction of correlation pulse so as to detect the deviation quantity and direction of the correlation pulse and controlling the phase of the reference PN code in response to the detection quantity. CONSTITUTION:A received PN code and a reference PN code are fed to a correlation device 1 and a correlation pulse is supplied to a matching filter 3 via a binarizing circuit 2. The matching filter 3 compares a compares a pattern of the correlation pulse with a prescribed pattern and outputs a coincident pulse to a up-down counter 4. The phase of the reference PN code from a reference PN code generating circuit 5 is controlled depending on the detection of deviation and its direction of the correlation pulse through the counting of the number of extracted correlation pulses. A PN code phase control pulse generating circuit 8 is triggered by a pulse from the counter 4 to output the phase control pulse of the reference PN code. |
