Method for capturing satellite signal carrier frequency

A technology of satellite signal and carrier frequency, applied in the field of acquisition, can solve the problems of prolonged cold start time, long search time and complicated search process of GPS receivers, and achieve the effect of reducing cold start time and shortening search time.

Inactive Publication Date: 2009-03-25
RDA MICROELECTRONICS SHANGHAICO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It can be seen that, in the prior art, the GPS receiver captures the satellite signal carrier frequency search process in the cold start process is more complicated, so the search time is relatively long, which leads to the extension of the cold start time of the GPS receiver

Method used

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  • Method for capturing satellite signal carrier frequency
  • Method for capturing satellite signal carrier frequency
  • Method for capturing satellite signal carrier frequency

Examples

Experimental program
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Embodiment

[0067] Digital IF signal received by GPS receiver S ( n ) = Ae jω if nT s The sampling frequency f s =5.043MHz, the carrier-to-noise ratio (CNR, Carrier Noise Ratio) is less than 20dBHz. It can be seen from the carrier-to-noise ratio that the signal strength of the digital intermediate frequency signal received by the GPS receiver is relatively weak. Based on this situation, from the sampling data of the digital intermediate frequency signal, a data segment is extracted every 10ms, a total of 40 data segments, and each data segment is divided into 10 data blocks, so that the time length of each data block is 1ms , there are 5043 sampling points in each data block; where, ω if is the carrier angular frequency of the satellite signal, and the sampling period T s =1 / f s ...

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Abstract

The invention relates to an acquisition method for satellite signal carrier wave frequency. The method comprises the following steps: extracting data segments from sampled data of digital IF signals S(n)=Ae and dividing each segment into data blocks, wherein wif represents satellite signal carrier wave angular frequency; determining the phrase compensation sequence of compensation angular frequency wi; processing products of the extracted data segments and a phrase compensation sequence and acquiring the angular frequency of peaks in a frequency spectrum; determining a satellite signal carrier wave angular frequency wif according to a formula that Wif is equal to wpeak minus wi and setting a working frequency of a digital controllable oscillator of a corresponding signal channel of a GPS receiver to complete acquisition of satellite signal carrier wave frequency. The method can reduce the search time for carrier frequency and time for cold start, and can be widely used in satellite receiving systems.

Description

technical field [0001] The invention relates to capture technology, in particular to a method for capturing carrier frequency of satellite signals. Background technique [0002] A Global Positioning System (GPS, Global Position System) receiver receives satellite signals sent by geostationary satellites, and corresponds to different geostationary satellites at different locations. Satellite signals include carrier signals, ranging codes and navigation messages. Ranging codes include coarse acquisition codes (C / A codes) and precise ranging codes (P codes). Both C / A codes and P codes have an amplitude of ±1 The pseudo-random sequence; the navigation message includes navigation information such as satellite ephemeris, geostationary satellite working status, clock correction, ionospheric delay correction, and atmospheric refraction correction. The set of space orbit parameters and instantaneous time and space coordinates of geosynchronous satellites is called satellite ephemeri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S1/04
Inventor 鲁郁
Owner RDA MICROELECTRONICS SHANGHAICO LTD
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