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- W1567177145 abstract "This chapter discusses the hardware of the receiver. Since the basic design of GPS receiver in this book is software oriented, the hardware presented here is rather simple. The only information needed for a software receiver is the sampled data. These sampled or digitized data will be stored in memory to be processed. For postprocessing the memory size dictates the length of data record. A minimum of 30 seconds of data is needed to find the user position as mentioned earlier. In real-time processing the memory serves as a buffer between the hardware and the software signal processing. The hardware includes the radio frequency (RF) chain and analog-to-digital converter (ADC). Thus, the signal processing software must be capable of processing the digitized data in the memory at a real-time rate. Under this condition, the size of the memory determines the latency allowable for the signal processing software. This chapter includes the discussion of the antenna, the RF chain, and the digitizers. Two types of designs are discussed. One is a single channel to collect real data and the other is an in-phase and quadrature phase (I-Q) channel to collect complex data. In both approaches, the input signals can be either down-converted to a lower intermediate frequency (IF) before digitization or directly digitized at the transmitted frequency. The relation between the sampling frequency and the input frequency is presented. Some suggestions on the sampling frequency selection are included. Two hardware setups to collect real data will be discussed in detail as examples. The impact of the number of digitized bits will also be discussed. A digital band folding technique is discussed that can alias two or more narrow frequency bands into the baseband. Other uses for this technique are discussed." @default.
- W1567177145 created "2016-06-24" @default.
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- W1567177145 date "2000-05-19" @default.
- W1567177145 modified "2023-09-23" @default.
- W1567177145 title "Receiver Hardware Considerations" @default.
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- W1567177145 doi "https://doi.org/10.1002/0471200549.ch6" @default.
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