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GPS and Global Navigation by Losik Ph.D Len

Author:Losik Ph.D, Len [Losik Ph.D, Len] , Date: April 3, 2020 ,Views: 309

GPS and Global Navigation by Losik Ph.D Len

Author:Losik Ph.D, Len [Losik Ph.D, Len]
Language: eng
Format: epub
Publisher: SanLen Publishing
Published: 2020-03-21T16:00:00+00:00


W hen recording PCM telemetry, it is important to ensure that the recorder provides sufficient frequency response to capture and reproduce the PCM signal. The following general rules may be used to calculate the maximum bit rate for various PCM codes.

NRZ, RNRZ, and DM codes: Maximum bit rate is 1.4 times the recorder frequency response.

All Bi-phase codes: Maximum bit rate is 0.7 times the recorder frequency response.

PCM Telemetry Transmission . PCM is a digital signal with sharp transitions that produce many harmonics. To limit the transmission bandwidth, the PCM signal is usually passed through a pre-modulation filter before being applied to the input of the transmitter. The following general rules may be used to calculate the filter cut-off frequency for various PCM codes.

NRZ, RNRZ, and DM codes: Filter cut-off frequency is 0.7 times the PCM bit rate.



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