Frequency drift determination method, time determination method and GNSS (Global Navigation Satellite System) receiver
A determination method and receiver technology, applied in the field of satellite navigation, can solve the problems of prolonging the time required for the first positioning of the GNSS receiver and affecting the start-up performance of the receiver, so as to reduce the size, reduce the required time, and accurately determine the Effect
Inactive Publication Date: 2017-09-08
HERONAV BEIJING TECH DEV
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Under the same receiver hardware resources and software algorithm conditions, the larger the two-dimensional indeterminate range of the carrier frequency value and code phase value of a satellite signal search, the longer the GNSS receiver completes the search for the satellite signal , which will lengthen the time required for the first fix of the GNSS receiver (TTFF), and affect the start-up performance of the receiver
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[0037] It needs to be further explained that if figure 1 As shown, the GNSS receiver needs to first capture and track the satellite signal in order to achieve position positioning (including the re-acquisition of the satellite signal by the GNSS receiver after the tracking signal is lost due to building blockage and other reasons); while the GNSS receiver The process of capturing satellite signals can be considered as a three-dimensional search process, that is, the GNSS receiver needs to first determine which satellite signals may be visible, and in what order to search for the satellite signals of the visible satellites, and then search for each possible visible satellite. The two-dimensional search of the frequency and time of the satellite signal is carried out by the satellite; because different satellite signals usually modulate different pseudorandom noise codes (PRN, pseudocode for short), and present different Doppler frequency shifts, so the satellite signal The freq...
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The embodiments of the invention provide a frequency drift determination method, a time determination method and a GNSS (Global Navigation Satellite System) receiver. The frequency drift and time determination schemes are provided according to the temperature sensing and recording instrument circuit design scheme of the GNSS (Global Navigation Satellite System) receiver. The frequency drift determination process of the frequency drift determination method includes the following steps that: the current related temperature value of a frequency drift component is obtained, wherein the related temperature value is obtained by means of the sensing of a temperature sensing component; a pre-analyzed frequency drift model is called, wherein the frequency drift model indicates the function relation of the temperature value and frequency drift value of the frequency drift component; and the current frequency drift value of the frequency drift component is determined according to the frequency drift model and the current related temperature value. The time determination process of the time determination method includes the following steps that: the current count value of the frequency drift component is obtained; and a current GNSS (Global Navigation Satellite System) time value is calculated according to the last count value of the frequency drift component and a corresponding time value. With the embodiments of the invention adopted, time required by the first positioning of the GNSS receiver can be possibly decreased.
Description
technical field [0001] The present invention relates to the technical field of satellite navigation, in particular to a method for determining frequency drift and time, and a GNSS receiver. Background technique [0002] As one of the most promising high-tech fields in the world today, GNSS (Global Navigation Satellite System, Global Navigation Satellite System) is an important symbol and concentrated expression of a country's comprehensive national strength, core competitiveness and scientific and technological innovation capabilities. At present, GNSS mainly includes China's Compass or BeiDou satellite navigation system, the United States' Global Positioning System (GPS, Global Positioning System), Russia's GLONASS (GLONASS), Europe's Galileo (Galileo) system, and India's regional navigation system. Satellite system (IRNSS), Japan Quasi-Zenith Satellite System (QZSS) and various satellite-based augmentation systems (SBAS, such as WAAS, EGNOS, MSAS) and so on. [0003] A GN...
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IPC IPC(8): G01S19/23G01S19/37
CPCG01S19/23G01S19/37
Inventor 谢钢谢承华邬成黄建勇宋志豪赵杰
Owner HERONAV BEIJING TECH DEV