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Methods for code phase searching spread spectrum signals

A spread spectrum signal, code phase technology, used in beacon transmitters, satellite radio beacon positioning systems, instruments, etc.

Inactive Publication Date: 2014-11-05
CSR TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these and other prior art systems, satellite signal searches have remained a sequential process where parallel processing is only applied to the phase delay of the particular satellite being searched

Method used

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  • Methods for code phase searching spread spectrum signals
  • Methods for code phase searching spread spectrum signals
  • Methods for code phase searching spread spectrum signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] figure 1 is a block diagram of an exemplary spread spectrum receiver, the receiver includes an input signal integration and preprocessing (ISIP) module 10, a segment and register block 20, a flash integration block 30, a PN code generator block 40, A Doppler generator block 50, a code phase computer block 60, a coherent integration block 70, a non-coherent integration block 80, a peak detector block 90, a real time clock block 92, a tracking processing block 94, a processing Interface block 96 and a timing generator block 98. In the preferred embodiment of the invention, a single hardware correlator block time-shares the search of N satellites in parallel. In another embodiment, the correlator blocks can be doubled to provide greater parallelization.

[0037] The receiver may be operated and controlled by an inherent digital signal processor (DSP) or by some other processor (not shown), such as a handset call processor integrated into a receiver application in a cell...

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PUM

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Abstract

Method and structure for code phase searching a spread spectrum signal, wherein said signal has a repeating bit sequence. By successively segmenting the received signal using a frequency divider (314), partially correlating signal segments and a corresponding replica signal segment are phase-delayed by a predetermined amount at a time interval no greater than that used to form the next signal segment, thereby virtually The signals are searched in parallel. For multiplication with the corresponding signal segment in a segment register (316), multiplexers (322) and (330) feed the multiplier (326) from the Doppler signal and replica signal generators (318) and (320), respectively. and (332) provide corresponding Doppler signal and replica signal segment data. The partial correlation results for each phase and at each Doppler frequency are stored in corresponding memory locations in a coherent accumulation RAM (334). Signals can be searched at one or more phase delays and at one or more Doppler frequencies.

Description

Technical field [0001] The present invention generally involves the expansion receiver, especially the programmable expansion receiver structure and its methods. Background technique [0002] The satellite -based positioning system enables the receiver, such as the Global Positioning System (GPS) receiver, which is widely used for navigation and has the huge potential of providing local information in mobile wireless communication devices. Communication devices can include honeycomb calls.Federal Communications Commission E-911 positioning requirements. [0003] The first requirement of a GPS receiver is to capture satellite signals (that is, usually referred to as expanded pseudo -random noise (PN) codes) and the time required to provide position coordinates after power supply.The time required for these operations is usually called the first positioning time (TTFF), which is generally determined by the hardware and software structure of the receiver. [0004] In the battery -p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/29G01S19/30G01S19/37H04B1/7075G01S1/00G01S19/24
CPCG01S19/29G01S19/30G01S19/37H04B1/70752H04B1/70753H04B2201/70715
Inventor 托马斯·迈克尔·金德尼斯·C·里默尔罗伯特·B·哈伯安德鲁·P·胡佛
Owner CSR TECH INC