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It can be assumed that the four signal components on the E5 band are modulated as a single wideband signal generated following AltBOC(15,10) 8-PSK modulation. 795MHz and has a bandwidth of at least 70MHz. AltBOC modulation offers the advantage that the E5a (I&Q) and E5b (I&Q) bands can be processed independently, like traditional BPSK(10) signals, or together, leading to tremendous performance in terms of tracking noise and multipath functions. Characteristics of all four signals are summarized in Table 2-2.

Moreover, to ensure low price and reliability, developers will design receivers with the lowest possible number of external components, low power consumption, and smaller size, and use low-cost technology to fabricate the devices. 1 Why a GPS/Galileo Receiver? As the majority of satellite navigation applications are currently based on GPS, great technological effort is being spent to integrate satellite-derived information with a number of other techniques in order to obtain better positioning precision with improved reliability.

As shown earlier in this chapter, this receiver will be a key component for accessing a variety of new services offered by these systems. This main objective must be divided into intermediate goals that will lead to the design of the front-end. These have to be accomplished step by step; that is, once the first goal has been fulfilled, the second one will be ready to be tackled. The objectives to be carried out are as follows: ■ ■ ■ A study of GPS and Galileo standards in order to set the requirements for the receiver.

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70 Jahre industrialisierte Datenverarbeitung by Adam A.


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