Paparazzi UAS
v6.3_unstable
Paparazzi is a free software Unmanned Aircraft System.

Simple high pass filter with double precision. More...
Go to the source code of this file.
Data Structures  
struct  FirstOrderHighPass 
First order high pass filter structure. More...  
struct  FourthOrderHighPass 
Fourth order filter structure. More...  
Functions  
static void  init_first_order_high_pass (struct FirstOrderHighPass *filter, float tau, float sample_time, float value) 
Init first order high pass filter. More...  
static float  update_first_order_high_pass (struct FirstOrderHighPass *filter, float value) 
Update first order high pass filter state with a new value. More...  
static float  get_first_order_high_pass (struct FirstOrderHighPass *filter) 
Get current value of the first order high pass filter. More...  
static void  init_fourth_order_high_pass (struct FourthOrderHighPass *filter, double *a, double *b, double value) 
Init fourth order high pass filter. More...  
static double  update_fourth_order_high_pass (struct FourthOrderHighPass *filter, double value) 
Update fourth order high pass filter state with a new value. More...  
static double  get_fourth_order_high_pass (struct FourthOrderHighPass *filter) 
Get current value of the fourth order high pass filter. More...  
Simple high pass filter with double precision.
Definition in file high_pass_filter.h.
struct FirstOrderHighPass 
First order high pass filter structure.
using bilinear z transform
Definition at line 37 of file high_pass_filter.h.
Data Fields  

float  last_in  
float  last_out  
float  time_const 
struct FourthOrderHighPass 
Fourth order filter structure.
Polynomial discrete form:
b0 + b1 z^1 + b2 z^2 etc
H(z) = — a0 + a1 z^1 + a2 z^2 etc
Definition at line 99 of file high_pass_filter.h.
Data Fields  

double  a[4]  denominator gains 
double  b[4]  numerator gains 
double  i[4]  input history 
double  o[4]  output history 

inlinestatic 
Get current value of the first order high pass filter.
filter  first order high pass filter structure 
Definition at line 86 of file high_pass_filter.h.
References FirstOrderHighPass::last_out.

inlinestatic 
Get current value of the fourth order high pass filter.
filter  fourth order high pass filter structure 
Definition at line 159 of file high_pass_filter.h.
References FourthOrderHighPass::o.

inlinestatic 
Init first order high pass filter.
Laplace transform in continuous time: tau*s H(s) = — 1 + tau*s
filter  first order high pass filter structure 
tau  time constant of the first order high pass filter 
sample_time  sampling period of the signal 
value  initial value of the filter 
Definition at line 56 of file high_pass_filter.h.
References FirstOrderHighPass::last_in, FirstOrderHighPass::last_out, and FirstOrderHighPass::time_const.
Referenced by nps_fdm_init().

inlinestatic 
Init fourth order high pass filter.
filter  fourth order high pass filter structure 
value  initial value of the filter 
Definition at line 112 of file high_pass_filter.h.
References FourthOrderHighPass::a, FourthOrderHighPass::b, b, FourthOrderHighPass::i, and FourthOrderHighPass::o.

inlinestatic 
Update first order high pass filter state with a new value.
filter  first order high pass filter structure 
value  new input value of the filter 
Definition at line 70 of file high_pass_filter.h.
References FirstOrderHighPass::last_in, FirstOrderHighPass::last_out, and FirstOrderHighPass::time_const.
Referenced by gazebo_write().

inlinestatic 
Update fourth order high pass filter state with a new value.
filter  fourth order high pass filter structure 
value  new input value of the filter 
Definition at line 131 of file high_pass_filter.h.
References FourthOrderHighPass::a, FourthOrderHighPass::b, FourthOrderHighPass::i, and FourthOrderHighPass::o.