ST20-GP1 Просмотр технического описания (PDF) - STMicroelectronics

Номер в каталоге

Компоненты Описание

производитель

ST20-GP1

GPS PROCESSOR

STMicroelectronics 

ST20-GP1

NCOphase0-11 registers

The NCOphase0-11 registers contents are added to the accumulated phase to correct the carrier

for the final 1 Hz that cannot be resolved by the NCO frequency. This addition is not cumulative,

and the value must be updated regularly by the software as a result of carrier phase errors

measured on the satellite signal. The register holds a signed 7-bit field representing +/-180

degrees total in steps of 2.8125 degrees (360/128).

NCOphase0-11

DSP base address + #C4 to #EC

Write only

Bit

Bit field

Function

6:0

NCOphase

NCO phase as a signed 7-bit value representing +/-180 degrees total in steps of

2.8125 degrees (360/128).

Table 3.7 NCOphase0-11 register format

PRNinitialVal0-1 registers

The initial value for the two RTCA-SC159 capable satellites channels should be written to the

PRNinitialVal0-1 registers. The value can be found in the RTCA-SC159 Specification.

Note: The value written to the register is the Initial Value defined by RTCA-SC159 for the PRN

required. The conversion from ‘big-endian’ as used in the specification to ‘little-endian’ as

conventionally used in ST20 architectures has been implemented in the hardware.

If uninitialized by the software, this register defaults to 11 1111 1111 (#3FF) as required for GPS

satellites.

PRNinitialVal0-1

Bit

Bit field

9:0

InitialValue

DSP base address + #100, #104

Function

Initial value of the RTCA-SC159 satellite channel.

Table 3.8 PRNinitialVal0-1 register format

Write only

17/116

®

Share Link: