Patent ID: 7057553
Filing Date: 2006-06-06
Classification: G01S

Abstract:
1. A method for aligning message data bits in positioning signals received at a ranging receiver, the positioning signals comprising a plurality of epochs, the method comprising: combining, for each of a plurality of stacks, a specified number of sub-stacks into the stack, each sub-stack comprising a specified number of epochs; grouping the stacks into pairs of stacks, each pair of stacks comprising a first stack and a second stack, the epochs included in the first stack adjacent to the epochs included in the second stack; summing, for each pair of stacks, the first stack and the second stack to generate a first result stack; subtracting, for each pair of stacks, the second stack from the first stack to generate a second result stack; evaluating the first result stacks and the second result stacks to identify pseudorange peaks; and aligning the message data bits based on a magnitude of the identified pseudorange peaks.