Bird Technologies BDS-Manual - Manual (Page 89)

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Table 5-54 Standard Mode Object Instances
Standard Mode Data Structures
The following subsections define the data structures used while running in the “Standard Operating Mode”.
Fundamental – Search frequency selection parameters
This structure is used to specify a fundamental frequency to include in the search/track algorithm in the “Standard Operat-
ing Mode”. Individual harmonic components are specified as well as IMD mixing products. Structure size = 12 bytes.
Instance Name Description
1 Fundamental 1 Fundamental frequency 1 configuration & data.
2 Fundamental 2 Fundamental frequency 2 configuration & data.
3 Fundamental 3 Fundamental frequency 3 configuration & data.
4 Fundamental 4 Fundamental frequency 4 configuration & data.
5 Fundamental 5 Fundamental frequency 5 configuration & data.
Fundamental
Name Data Type Description Byte
Frequency UDINT Center fundamental frequency value in Hz.
Value range: 1-500,000,000Hz in 8-bit ADC
mode, 1-100,000,000Hz in 12-bit mode. A
value of 0 indicates an invalid frequency.
Default: 0 0
Harmonic
Selection WORD Harmonic selection bitfield. Each set bit (1)
selects a harmonic. Harmonics are zero-
based, with H0 as the fundamental and H1 as
the 1
st harmonic. See the HarmSel bitfield for
details.
Default: 1 (fundamental)
4
Tolerance USINT Frequency error tolerance value in 0.1% steps
from the center frequency. Error tolerance
value. E.g. a value of 50 would indicate a +/-
5% allowable tracking window.
Note: tolerance is based on the fundamental
frequency.
Max Tolerance (in 0.1% steps) = (5/MHz) *
1000
Default: 50 (5% tolerance) 6
Filter Width USINT Tracking filter width in 0.01% steps.
This is an advanced parameter used to fine-
tune tracking performance. Setting to 0 will use
the default value of 10 (0.1%).
Default: 10 (0.1% width) 7