decaWave DW1000, Руководство пользователя

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DW1000 User Manual
© Decawave Ltd 2017 Version 2.12 Page 98 of 242
Field Description of fields within Register file: 0x12 – Rx Frame Quality Information
CIR_PWR
reg:12:04
bits:31–16
Channel Impulse Response Power. This is a 16-bit value reporting the sum of the squares of
the magnitudes of the accumulator
from the estimated highest power portion of the channel,
which is related to the receive signal power. This value can be used in assessing the quality of
the received signal and/or the receive timestamp produced by the LDE algorithm. For more
details please refer to section
4.7 – Assessing the quality of reception and the RX timestamp .
7.2.21 Register file: 0x13
– Receiver Time Tracking Interval
ID
Length
(octets)
Type Mnemonic Description
0x13 4 ROD RX_TTCKI Receiver Time Tracking Interval- included in swinging set
Register map register file 0x13 operates with Register file: 0x14 – Receiver Time Tracking Offset to give a
measure of the clock offset (or crystal offset) between the local receiver and the remote end transmitter
device.
Register file: 0x13 – Receiver Time Tracking Interval is in the RX double-buffered swinging-set. See section
4.3 – Double Receive Buffer for more details.
The RX_TTCKI register contains the following sub-fields which are updated when a frame demodulation is
completed successfully:
REG:13:00 – RX_TTCKI – Receiver Time Tracking Interval
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RXTTCKI
0
Field Description of fields within Register file: 0x13 – Receiver Time Tracking Interval
RXTTCKI
reg:13:00
bits:31–0
RX time tracking interval. The value here is the interval over which the timing offset reported
in the RXTOFS field of
Register file: 0x14 – Receiver Time Tracking Offset is measured. The clock
offset is calculated by dividing RXTOFS by RXTTCKI. The value in RXTTCKI will take just one of
two values depending on the PRF: 0x01F00000 @ 16 MHz PRF, and 0x01FC0000 @ 64 MHz
PRF.
7.2.22 Register file: 0x14
– Receiver Time Tracking Offset
ID
Length
(octets)
Type Mnemonic Description
0x14 5 ROD RX_TTCKO Receiver Time Tracking Offset- included in swinging set
Register map register file: 0x14 operates with Register file: 0x13 – Receiver Time Tracking Interval to give a
measure of the clock offset (or crystal offset) between the local receiver and the remote end transmitter
device.