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communication device

A communication equipment and technology for receiving signals, applied in satellite radio beacon positioning systems, measuring devices, instruments, etc., can solve problems such as the reduction of GPS signal accuracy, and achieve the effect of improving accuracy

Active Publication Date: 2017-07-21
SONY SEMICON SOLUTIONS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is concern that the accuracy of simultaneous acquisition of GPS signals performed by communication equipment will be reduced due to Doppler shift

Method used

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Embodiment approach

[0035] 2. Variations

[0036]

[0037] figure 1 is a block diagram showing a structural example of the communication device 101 according to the embodiment of the present invention. The communication device 101 is provided with a communication antenna 111 , a frequency converting unit 112 , a noise canceling unit 113 , a demodulating unit 114 , an XO (Crystal Oscillator) 115 , and a TCXO (Temperature Compensated Crystal Oscillator) 116 .

[0038] The communication antenna 111 receives RF signals (hereinafter also referred to as GPS signals) transmitted by GPS satellites.

[0039] Here, the GPS signal is a signal obtained by performing spectrum diffusion on transmission data such as a navigation message by a spreading code, multiplying the obtained spectrum diffusion signal by a carrier, and performing BPSK (Binary Phase Shift Keying) modulation. Further, since a spreading code is used for spectrum diffusion, a pseudorandom noise code (PN code) called a 1023-chip C / A code i...

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Abstract

A communication device including: a Doppler offset calculating unit configured to calculate a Doppler offset of a received signal obtained by modulating a signal spectrally diffused using a predetermined spreading code at a predetermined carrier frequency amount; the frequency shift amount setting unit is configured to set the frequency shift amount according to the Doppler offset; the frequency conversion unit is configured to offset the frequency shift amount of the received signal; the coherent superposition unit is configured to receive performing coherent superposition of signals; a spreading code generation unit configured to generate a spreading code; and a phase detection unit configured to perform correlation calculation between a calculation result of coherent superposition and the generated spreading code, and according to The phase of the spreading code of the received signal is detected as a result of the correlation calculation.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Japanese Priority Patent Application JP2012-273559 filed on December 14, 2012, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a communication device, in particular, to a communication device using a satellite navigation system such as GPS (Global Positioning System). Background technique [0004] In GPS (Global Positioning System), through the Doppler effect associated with artificial satellites (hereinafter referred to as GPS satellites) or communication equipment receiving signals from GPS satellites (hereinafter referred to as GPS signals), communication equipment receives The frequency of the GPS signal changes, ie produces a Doppler shift. Due to the Doppler shift, there is concern that the accuracy of the simultaneous acquisition of GPS signals performed by the communication device will be reduced...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7075H04J13/10
CPCG01S19/29H04B7/1855
Inventor 宝地卓
Owner SONY SEMICON SOLUTIONS CORP