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GLAST / LAT > DAQ and FSW > FSW > Doxygen Index> QSE / V2-3-0 > qse / sun-gcc

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QDF_cal_prd_def.h File Reference

Compress structures for the CAL range prediction. More...

#include "LSE/CDF_cal_prd_model.h"
#include "EDS/EDS_endianness.h"
#include "EDS/ECR_cal.h"

Classes
struct	_QDF_cal_prd_log_end_table
	The table prediction constants for one log end. More...
struct	_QDF_cal_prd_log
	The prediction constants for one log. More...
union	_QDF_cal_prd_layer
	The range predictors for one range of one layer. More...
union	_QDF_cal_prd_tower
	Constants used when predicting one gain range from another, one tower's worth. More...
struct	_QDF_cal_prd
	Constants used when predicting one gain range from another. More...
Typedefs
typedef CDF_cal_prd_log_end	QDF_cal_prd_log_end
typedef struct _QDF_cal_prd_log_end_table	QDF_cal_prd_log_end_table
	Typedef for struct _QDF_cal_ped_log_end_table.
typedef struct _QDF_cal_prd_log	QDF_cal_prd_log
	Typedef for struct _QDF_cal_ped_log_table.
typedef union _QDF_cal_prd_layer	QDF_cal_prd_layer
	Typedef for union _QDF_cal_ped_prd_layer.
typedef union _QDF_cal_prd_tower	QDF_cal_prd_tower
	Typedef for union _QDF_cal_ped_prd.
typedef struct _QDF_cal_prd	QDF_cal_prd

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Detailed Description

Compress structures for the CAL range prediction.

Author:

JJRussell - russell@slac.stanford.edu

    CVS $Id: QDF_cal_prd_def.h,v 1.1 2006/11/10 22:35:52 russell Exp $

These data structures and functions are useful on both the encoding and decoding side. The key component is the range predictor function which takes as input a CAL PHA value or a given range + a 32-bit word containing the information used to predict the value of a different range.

The constants used to implement the predictor are carefully constructed to

1. Fit in a 32-bit word
2. Implement the transformation via an addition, a multiple and a shift operation with no conditional logic

While not important on the decoding side (i.e. the ground), these features are important on the encoding side (i.e. the flight system), where minimizing resources is important.

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