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Receiver, apparatus for generating despread code, and method of generating despread code

A technology of receiving device and generating device, which is applied in the direction of measuring device, multiplexing code generation, satellite radio beacon positioning system, etc., can solve the problem of longer synchronization time, reduce decoding errors, and improve positioning accuracy

Inactive Publication Date: 2006-06-07
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Therefore, when using the same pattern as the pattern on the transmitting side as the pattern of the local diffusion code used for synchronization, it is judged that the parts where the values ​​of the two should match are not consistent, and the synchronization time will become longer. The problem

Method used

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  • Receiver, apparatus for generating despread code, and method of generating despread code
  • Receiver, apparatus for generating despread code, and method of generating despread code
  • Receiver, apparatus for generating despread code, and method of generating despread code

Examples

Experimental program
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Effect test

no. 1 example

[0061] figure 1 It is a schematic diagram of a GPS receiver 10 and the like as an example of a receiving device.

[0062] The GPS receiver 10 has a GPS antenna 14 as an example of a signal receiving device, and receives positioning signals S1 to S4 transmitted from the GPS satellites 12a to 12d. The signals S1 to S4 are signals in which the 50 Hz navigation message is spread-modulated with a spread code called a C / A code and carried on a carrier with a frequency of 1.575 GHz called the L1 band.

[0063] The GPS receiver 10 demodulates and decodes the received signals S1 to S4, obtains the navigation message, and calculates its own current position.

[0064] A PC (Personal Computer: Personal Computer) 50 is an example of a correction despreading code generation device, and the despreading code generated by the PC 50 is loaded into the GPS receiver 10 .

[0065] Moreover, the GPS satellites used for positioning by the GPS receiver 10 are not limited to figure 1 The 4 shown ...

no. 2 example

[0110] (Structure of GPS receiver 10a)

[0111] Figure 4 It is a schematic diagram of a GPS receiver 10 a that is a modified example of the GPS receiver 10 .

[0112] The GPS receiver 10a differs from the GPS receiver 10 in the method of causing the C / A code supply unit 28 to generate the C / A code. In the GPS receiver 10a, an IC 28a (an example of a circuit) integrated in the C / A code supply unit 28 has such a circuit configuration that it generates a corrected C / A code corresponding to an arbitrary GPS satellite in operation.

[0113] Since the GPS receiver 10a generates the correction C / A code by hardware, it can operate at a higher speed than the case of generating the correction C / A code by software.

no. 3 example

[0115] The third embodiment of the present invention will be described below. Components that are the same as those in the first embodiment are assigned the same reference numerals, and description thereof will be omitted here.

[0116] Figure 8 It is a schematic diagram of the portable terminal 100 etc. which are GPS receivers as an example of a receiver.

[0117] The mobile terminal 100 has a GPS receiving unit 110, and performs positioning using a signal S1 or the like transmitted from a GPS satellite 12a or the like.

[0118] The portable terminal 100 further includes a communication unit 120 , communicates with the server 200 through the base station 150 and the network 160 , and obtains the modified C / A code from the server 200 .

[0119] (Configuration of Portable Terminal 100)

[0120] Figure 9 is a schematic diagram of the configuration of the mobile terminal 100 .

[0121] The portable terminal 100 includes a GPS receiving unit 110 and a communication unit 120...

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Abstract

The invention discloses a receiving device, a device for generating a modified despreading code and a method for generating the modified despreading code generated by predicting the deformation of the transmitted spreading code in a receiver circuit to perform despreading processing. Wherein, the receiving device (10) includes: a signal receiving device, used to receive the transmitted signal, and obtain the received signal; a filter device, used to remove high-frequency components from the received signal; A / D conversion device, used to convert the filter device The output signal is to generate a digital signal; the inverse diffusion processing device is used to multiply the digital signal and the inverse diffusion symbol to perform inverse diffusion processing; and the inverse diffusion symbol supply device is used to generate the modified inverse diffusion symbol generated based on the deformed diffusion symbol Despread codes are supplied to the despread processing device, wherein the spread codes correspond to the positions where the PSK-modulated signal based on the spread codes included in the received signal is significantly deformed, that is, the positions where the diffuse codes are deformed.

Description

technical field [0001] The present invention relates to a receiving device for performing despreading processing using a modified despreading code, a device for generating a modified despreading code, and a method for generating a modified despreading code, wherein the modified despreading code is used in a receiver circuit for the transmitted diffusion code The deformation is predicted and generated. Background technique [0002] Communication based on the direct diffusion method, which is one of the spectral diffusion methods, has been widely used conventionally. CDMA (Code Division Multiple Access: Code Division Multiple Access) which is a specific preferred example of the direct diffusion method is used in mobile phone systems, GPS (Global Positioning System: Global Positioning System), and the like. [0003] In the direct diffusion method, the transmission data is diffused over a wider frequency band by multiplying the transmission data with a diffusion symbol such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/23G01S19/30H04J13/10
CPCG01S19/23G01S19/30H04B1/06
Inventor 武藤信雄
Owner SEIKO EPSON CORP
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