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Satellite signal capturing method compatible with GPS and Beidou 2nd navigation system

A satellite signal capture and navigation system technology, applied in the field of baseband signal processing, can solve problems such as high cost, poor flexibility, and capture channels that cannot be shared

Active Publication Date: 2010-02-03
TECHTOTOP MICROELECTRONICS
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Problems solved by technology

[0018] The object of the present invention is to provide a satellite signal acquisition method compatible with GPS and Beidou 2 navigation system, so that under the control of the acquisition mode indication parameter, it can be used to capture GPS satellite signals and also can be used to capture Beidou 2 satellite signals, thereby Solve the problems of high cost, poor flexibility, and inability to share capture channels of different formats in existing solutions

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  • Satellite signal capturing method compatible with GPS and Beidou 2nd navigation system

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Embodiment Construction

[0073] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0074] The present invention has no special limitation on the hardware platform for realizing the method. Its input signal is an intermediate frequency digital signal provided by the RF front end. There is no special limit on the signal strength, generally greater than -159dBm, and there is no specific limit on the number of sampling bits, generally 2 to 4 bits. Its RF front-end can be a GPS-specific RF front-end plus a Beidou-2 dedicated RF front-end, or a general-purpose front-end capable of simultaneously processing GPS and Beidou-2 RF signals. There is no special limit to the number of channels captured in parallel, generally within the range of 8 to 16.

[0075] The following takes the capture of a Beidou 2 channel as an example, combined with the attached Figure 5 Be explained. If there are multiple parallel capture channels, the c...

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Abstract

The invention relates to a baseband signal processing method in the technical field of satellite navigation, in particular to a satellite signal capturing method compatible with a GPS and a Beidou 2ndnavigation system. The satellite signal capturing method comprises the following steps: carrying out packing processing and FFT operation on input signals; generating local carrier signals and localcode sequences; generating local radio-frequency signals; carrying out packing processing and FFT operation on the radio-frequency signals; correspondingly multiplying the input signals after the FFToperation with the radio-frequency signals; conjugating a multiplication result and carrying out the FFT operation; using signals obtained from conjugation to construct a data matrix and carrying outmodulus operation on each of the elements in the matrix; and finally applying a judgment rule to judge the data matrix and obtaining a capture result. When resource expenditure is not increased, the capturing method not only can capture GPS satellite signals, but also can capture Beidou 2nd satellite signals and can be used in a GPS / Beidou 2nd double-mode satellite navigation signal receiving device.

Description

technical field [0001] The invention relates to a baseband signal processing method in the technical field of satellite navigation, in particular to a satellite signal acquisition method compatible with GPS and Beidou 2 satellite navigation systems. Background technique [0002] With the construction and development of my country's second-generation Beidou satellite navigation system (referred to as "Beidou-2"), the development of GPS / Beidou-2 dual-system navigation signal receiving devices has increasingly become a research focus in the field of satellite navigation in recent years. And one of the keys of this navigation signal receiving device is to design a satellite signal acquisition method compatible with GPS and Beidou 2 navigation system. [0003] According to the published literature, there are two types of existing GPS / Beidou 2 compatible receiving devices, such as the attached figure 1 And attached figure 2 shown. Observation attached figure 1 And attached ...

Claims

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Application Information

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IPC IPC(8): G01S5/02G01S5/14
Inventor 林静然李玉柏陈永刚高峰易清明
Owner TECHTOTOP MICROELECTRONICS
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