Download A Software-Defined GPS and Galileo Receiver: A by Kai Borre, Dennis M. Akos, Nicolaj Bertelsen, Peter Rinder, PDF

By Kai Borre, Dennis M. Akos, Nicolaj Bertelsen, Peter Rinder, Søren Holdt Jensen

A good written publication. Excessively concise. an excessive amount of fabric at the RF Front-end, while the most expectable concentration could be the base-band. The publication does, despite the fact that, serve its goal good.

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Additional info for A Software-Defined GPS and Galileo Receiver: A Single-Frequency Approach (Applied and Numerical Harmonic Analysis)

Example text

34 3. 1. Galileo modulation scheme. The scheme is based on the modulation principle coherent adaptive subcarrier modulation (CASM). Now we have information for defining the binary signal components for channels B and C. However, information on channel A is not available. 1, we will describe the Galileo signal L1 OS. The signal component for channel B results from the modulo-2 addition of the navigation data stream d L1−B , the PRN code sequence c L1−B , and the B subcarrier sc L1−B . The final component is called e B .

In this book we deal only with the L1 OS signal (OS for open service). The L1 OS signal alone is expected to guarantee a horizontal accuracy better than 15 m, a vertical accuracy better than 35 m, a velocity accuracy better than 50 cm/s, and a timing accuracy better than 100 ns. The augmentation from a single-frequency to a dual-frequency Galileo receiver naturally includes the E5a signal. For a dual frequency receiver the corresponding accuracies are 7 m, 15 m, 20 cm/s, and 100 ns. All Galileo satellites use the same frequency bands and make use of code division multiple access (CDMA) technique.

5 minutes. Courtesy: Frank van Diggelen. navigation data. 9 shows the overall structure of an entire navigation message. The basic format of the navigation data is a 1500-bit-long frame containing 5 subframes, each having length 300 bits. One subframe contains 10 words, each word having length 30 bits. Subframes 1, 2, and 3 are repeated in each frame. The last subframes, 4 and 5, have 25 versions (with the same structure, but different data) referred to as page 1 to 25. 5 minutes. 1 Telemetry and Handover Words The subframes of 10 words always begin with two special words, the telemetry (TLM) and handover word (HOW) pair.

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