get_6bit.c

一个用于gps中的汉明码校验的程序

/**********************************
 ***取得导航电文中25-30bit的校验位
***************************************/

#include"hanming.h"

int * Get_6bit ( int * forhan ,int * phanming )
{

	/*int sum[6];

	//int * phanming = sum[0] ;*/
	int i, j;

	int han_H[6][24] = {                                      
		{1,1,1,0,1,1,0,0,0,1,1,1,1,1,0,0,1,1,0,1,0,0,1,0},
		{0,1,1,1,0,1,1,0,0,0,1,1,1,1,1,0,0,1,1,0,1,0,0,1},
		{1,0,1,1,1,0,1,1,0,0,0,1,1,1,1,1,0,0,1,1,0,1,0,0},
		{0,1,0,1,1,1,0,1,1,0,0,0,1,1,1,1,1,0,0,1,1,0,1,0},
		{1,0,1,0,1,1,1,0,1,1,0,0,0,1,1,1,1,1,0,0,1,1,0,1},
		{0,0,1,0,1,1,0,1,1,1,1,0,1,0,1,0,0,0,1,0,0,1,1,1}
	};
		
	for ( i=0; i<6; i++ )
	{
		* ( phanming + i ) = ( * ( * ( han_H + i ) ) ) ^ ( * forhan );

	/*	printf("%4d",sum[i]);*/

	}

	for ( i=0; i<6; i++ )
	{
		for( j=1; j<24; j++ )
		{
			* ( phanming + i ) ^= ( * ( * ( han_H + i ) + j ) ) ^ ( * ( forhan +j ) );
		}
	}

	return phanming;
	
}