초록 ▼

In a delay-lock one-delta (±½chip) dithered PN code tracking loop, an indication of lock in the PN code tracking loop is provided by delaying the dithered local PN code by a half chip to produce a +0, -1 dithered PN code that is then multiplied with the received PN-spread IF signal to produce a sign

In a delay-lock one-delta (±½chip) dithered PN code tracking loop, an indication of lock in the PN code tracking loop is provided by delaying the dithered local PN code by a half chip to produce a +0, -1 dithered PN code that is then multiplied with the received PN-spread IF signal to produce a signal proportional to the correlation of this dithered code offset from the received code. The correlation signal is bandpass filtered, amplified with AGC control, and square-law detected to obtain a DC signal proportional to the degree of correlation. The DC signal is multiplied by the dithering control signal to effectively subtract noise voltage from the lock correlation signal which is then compared with a PN lock status signal.

대표청구항 ▼

In a delay-lock dithered PN code tracking loop for tracking a received PN-spread IF signal, apparatus for an indication of lock in said PN code tracking loop, wherein said loop utilizes a local PN code signal dithered by ±½a code bit period in response to a dither control signal, a lock detector cha

In a delay-lock dithered PN code tracking loop for tracking a received PN-spread IF signal, apparatus for an indication of lock in said PN code tracking loop, wherein said loop utilizes a local PN code signal dithered by ±½a code bit period in response to a dither control signal, a lock detector channel comprising means for delaying said dithered local PN code signal by half a code bit period, means for correlating said dithered and delayed local PN code signal with said received PN-spread IF signal to produce a DC signal proportional to the degree of correlation between said signals, and means for phase detecting said DC signal with said dither control signal to produce a DC lock detector output signal proportional to the degree of correlation between said received PN-spread signal and said dithered and delayed local PN code.