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GNSS new-system signal capturing device and method

A signal acquisition and system technology, applied in measurement devices, satellite radio beacon positioning systems, instruments, etc., can solve problems such as affecting the receiver's first positioning time and hot start, restricting receiver acquisition efficiency, and high computational complexity. Achieve the effect of low false capture rate, improved detection accuracy, and low computational complexity

Inactive Publication Date: 2015-04-22
PEKING UNIV
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Problems solved by technology

If the traditional sliding serial correlation time-frequency two-dimensional search algorithm, parallel frequency search algorithm or parallel code phase search algorithm is used, there will be problems such as large computational complexity and long search time, which will affect the receiver's first positioning time and hot start. , especially in high dynamic application environments, which restricts the acquisition efficiency of the receiver

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  • GNSS new-system signal capturing device and method
  • GNSS new-system signal capturing device and method

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0031] figure 1 A structural diagram of a GNSS new system signal acquisition device according to a preferred embodiment of the present invention is shown.

[0032] Such as figure 1 As shown, the present invention provides a kind of GNSS new system signal acquisition device, and this device comprises differential correlator module (101), mixer I (102), mixer Q (103), carrier NCO (104), correlation Device I (105), correl...

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Abstract

The invention discloses a GNSS new-system signal capturing device and method. The device comprises a difference correlator module, a carrier wave NCO generator, a local PN code generator, a correlator, a frequency mixer, a segment correlation zero-fill FFT module and a capture detection control module. The difference correlator module determines the PN code phase offset of a received satellite signal via a digital intermediate-frequency input signal, a difference output signal and a local carrier wave are mixed and demodulated to the base band, an in-phase branch I and an orthogonal branch Q are obtained via the correlator and the local PN code generator, the segment correlation zero-fill FFT module carries out coherent integration and segment noncoherent accumulation on operation results, and after zero-filling of the R-point accumulation result, S-point FFT is carried out to complete rapidly capture the GNSS new-system signals. The PN code phase offset of the received satellite signal can be rapidly determined, the Doppler frequency estimation precision can be improved via segment correlation zero-fill FFT, the device is simple, the false capture rate is low, and new-system signals can be rapidly captured.

Description

technical field [0001] The invention belongs to the technical field of global satellite navigation system signal processing, and in particular relates to a GNSS new system signal acquisition device and method. Background technique [0002] Global Navigation Satellite System (GNSS) plays an extremely important role in both military and civilian fields. GNSS can provide positioning, navigation and timing services for receivers, and plays an important role in military and civilian fields. With the development of navigation systems, multi-system information fusion and positioning calculation has become the current development trend. The new system signals are widely used in the third-generation GPS of the United States, Galileo of the European Union and other navigation satellites, and the code length of the new system signals It is 10230 chips, and the code rate reaches 10.23Mcps, which is 10 times the code length and code rate of the traditional old system navigation signal. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24G01S19/30
CPCG01S19/24G01S19/30
Inventor 孟凡琛陶林顾小影朱柏承
Owner PEKING UNIV
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