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Method and device for generating second pulse of satellite navigation receiver

A technology of satellite navigation and second pulse, which is applied in the field of satellite navigation, can solve the problems of large precision deviation and large amount of calculation, and achieve the effect of completely consistent parameters, improved time accuracy, and simple and easy solution

Active Publication Date: 2018-05-08
SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing satellite navigation receiver only uses the clock difference to generate the second pulse and its precision deviation is relatively large, and overcome the shortage of using a phase-locked loop to stably control the method of generating the second pulse with a large amount of calculation, and proposes a A new method and device for generating second pulses of satellite navigation receivers

Method used

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  • Method and device for generating second pulse of satellite navigation receiver
  • Method and device for generating second pulse of satellite navigation receiver
  • Method and device for generating second pulse of satellite navigation receiver

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Embodiment 1

[0053] Further describe the generation method of the present invention below in conjunction with accompanying drawing, refer to image 3 , including the following steps:

[0054] S1: Use the counter to count the frequency reference unit to generate a rough TIC signal, and latch the pseudo code phase and carrier Doppler value of the navigation satellite signal at the leading edge of the TIC signal;

[0055] S2: Calculate according to the latched pseudo-code phase and carrier Doppler value to obtain position, velocity, time, clock difference and clock drift;

[0056] S3: Calculate the adjustment amount of the next TIC signal period by using the clock difference and clock drift;

[0057] S4: Limiting and adjusting the adjustment amount of the TIC signal cycle;

[0058] S5: Generate a signal TIC1 with only a different phase from the TIC signal, and select the pulse closest to the full second of UTC in TIC1 to output to obtain a 1PPS second pulse.

[0059] Described step S1 specif...

Embodiment 2

[0095]The device for realizing second pulse generation through the method of the present invention is mainly composed of a receiving antenna, a radio frequency front-end module, a capture and tracking module, an observation quantity extraction module, a text analysis module, a positioning solution module and a time reference module. First, the antenna receives satellite navigation signals and outputs them to the RF front-end, where the signals are amplified, filtered, down-converted, and analog-to-digital converted. Then the capture and tracking module captures the satellite signal, and updates the tracking loop under the control of the time reference module to track the signal; the observation extraction module extracts the pseudo code phase and carrier Doppler from the leading edge of the local time timing signal TIC in the time reference module The value is used by the subsequent navigation positioning calculation module. The message analysis module implements the analysis ...

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Abstract

The invention discloses a method and a device for generating a second pulse of a satellite navigation receiver. The method includes the following steps: generating a rough timing signal TIC through afrequency reference device such as a crystal oscillator; latching the pseudo code phase, carrier Doppler value and other observables of a satellite signal at the leading edge of the TIC signal; carrying out positioning calculation according to the satellite position, pseudo distance correction and other parameters in a navigation message to obtain the position, speed, clock difference and clock drift; calculating the adjustment amount of next TIC signal cycle by using the clock difference and the clock drift value; and finally, adjusting the TIC signal, and generating an accurate 1PPS second pulse signal. The problem that large deviation is caused as the existing satellite navigation receiver generates a second pulse according to the clock difference only is solved. The defect that the method for generating a second pulse under stable control of a phase locked loop needs a large amount of computation is overcome.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a method for generating the local time and second pulse of a satellite navigation receiver and a corresponding device. Background technique [0002] Global Navigation Satellite System (GNSS) can provide users with all-weather, continuous, accurate position, speed and time information on a global scale. The application of this system has already penetrated into many aspects such as economy, society and military. At present, there are mainly four global satellite navigation systems in space: BeiDou of China, GPS of the United States, GLONASS of Russia and Galileo of the European Union. [0003] The satellite navigation receiver is used to receive the above-mentioned satellite navigation system signals to realize position positioning and timing functions. The satellite navigation receiver captures and tracks the satellite signals by receiving more than 4 satellite sign...

Claims

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Application Information

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IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 丁亚玲曹亮刘庆吴翔杨东旭吴红梅孙斯亮
Owner SHANGHAI SPACEFLIGHT INST OF TT&C & TELECOMM
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