By Kai Borre, Dennis M. Akos, Nicolaj Bertelsen, Peter Rinder, Søren Holdt Jensen
This ebook discover using new applied sciences within the sector of satellite tv for pc navigation receivers. so as to construct a reconfigurable receiver with a variety of functions, the authors speak about receiver structure in keeping with software-defined radio strategies. The presentation unfolds in a basic type and is going from the fundamentals to state of the art examine. The ebook is geared toward utilized mathematicians, electric engineers, geodesists, and graduate scholars. it can be used as a textbook in a variety of GPS know-how and sign processing classes, or as a self-study reference for somebody operating with satellite tv for pc navigation receivers.
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Extra resources for A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach
4 Hz for the stationary and the high-speed GPS receiver, respectively. The Doppler frequency on the C/A code can cause misalignment between the received and the locally generated codes and the values of the Doppler frequency are important for the tracking method. We return to this topic in Chapters 6 and 7. 5 Code Tracking GPS signal receiving involves a classical problem, namely that one of code tracking which can be solved by means of the delay-locked loop (DLL) scheme based on an early–late discriminator.
2. Output of ordinary multiplication Input Input Output Input Input Output 0 0 1 1 0 1 0 1 0 1 1 0 −1 −1 1 1 −1 1 −1 1 1 −1 −1 1 data generator are synchronized through the X 1 signal supplied by the P(Y) code generator. After code generation, the codes are combined with the navigation data through modulo-2 adders. 1. , 1’s and −1’s, ordinary multiplication could be used instead. 2. The C/A code ⊕ data and the P(Y) code ⊕ data signals are supplied to the two modulators for the L1 frequency. Here the signals are modulated onto the carrier signal using the binary phase shift keying (BPSK) method.
2. Set the checksum equal to the binary vector of length r corresponding to the remainder from step 1. 3. Append the checksum to the input data frame. The result is the output frame. The CRC algorithm uses binary vectors to represent binary polynomials, in descending order of powers. For example, the vector [ 1 1 0 1 ] represents the polynomial x 3 + x 2 + 1. 1 Suppose the input frame is [ 1 1 0 0 1 1 0 ]T , corresponding to the polynomial M = x 6 + x 5 + x 2 + x, and the generator polynomial is P = x 3 + x 2 + 1, of degree r = 3.
A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach by Kai Borre, Dennis M. Akos, Nicolaj Bertelsen, Peter Rinder, Søren Holdt Jensen