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A method of processing an RF signal

A signal and processor technology, applied in the field of GPS signals, which can solve the problems of complex duplication of physical chips

Active Publication Date: 2010-01-13
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] This is not a common problem with traditional hardware GPS vendors, since duplicating the physical chip (or chipset) is naturally much more complicated

Method used

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  • A method of processing an RF signal
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  • A method of processing an RF signal

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Embodiment Construction

[0038] The present invention generally relates to RF signal receivers. It is worth noting that the so-called "software GPS", as the name implies, is a GPS system in which all data processing is implemented by software, and the received data is stored in a memory buffer. This breaks the real-time connection to the receiver and reduces the amount of dedicated hardware (eg correlators) needed.

[0039] The basic structure of the software GPS receiver 30 is as figure 1 shown.

[0040] The receiver includes a receiver front end 32 that uses an antenna 34 to receive wireless signals. Receiver front end 32 receives modulated RF signals from one or more satellites.

[0041] The received signal is amplified, filtered, downconverted and digitized by a receiver front end 32 to produce a baseband signal 33 from the received signal, and in the form of digitized samples.

[0042] The digitized samples are provided to a memory buffer 36 and the data stored in the memory 36 is processed by...

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Abstract

A method of receiving and processing an RF signal comprises receiving (5) the RF signal; analogue processing the signal and providing a digital output to a digital signal processor, the digital output including an added identification code unique to an RF front end receiver hardware. Within the digital signal processor, the identification code is compared with a predetermined identification code or set of codes to determine if there is match. If there is a (10) match, the digital output is processed to provide data to the user, and if there is not a match, an error function is implemented. This method enables a software developer to make the system function only when there is a match between the hardware and the software. This makes copying the software as difficult as copying the hardware, because (15) copied software will not work with the incorrect hardware batch.

Description

technical field [0001] The present invention relates to a method of processing RF signals, such as GPS signals. Background technique [0002] The article "A Real-Time Software Wireless Architecture for GPS Receivers" by Akos et al. (GPS World, July 2001) discloses a GPS software receiver in which the GPS signal processing is done by a single device, as opposed to analog or discrete hardware components. A simplified "GPS software receiver" is provided consisting of a GPS antenna and a GPS RF front-end receiver for GPS signal preprocessing (including filtering, amplification, and frequency downconversion) and analog-to-digital conversion. [0003] The GPS signal samples output by the GPS RF front-end receiver can be passed back to a modern PC running appropriate GPS signal processing software to determine a fix. The authors of this article conceived of this GPS software receiver as a "plug-in" mode, such as a "dongle" type device, because its simple structure lends itself to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/14G01S19/35
CPCG06F2221/2111G06F21/73G06F21/123G06F2221/2129G01S5/0036G01S19/35G06F21/43Y10T29/49016G01S19/36
Inventor 安德鲁·T.·于勒伊恩·西蒙斯
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