COMPASS and GPS double system second difference switching method

A dual-system, time-difference technology, applied to radio wave measurement systems, beacon systems using radio waves, and measurement devices, can solve problems such as time scale signal jitter, timing performance degradation, and poor time scale signal systems, and achieve improved The effect of timing performance

Active Publication Date: 2009-04-01
郑州威科姆科技股份有限公司
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Problems solved by technology

[0002] At present, satellite timing equipment under the GPS system is widely used in our country, but there are great potential safety hazards. The "Beidou-1" satellite navigation and positioning system is an all-weather, regional satellite navigation and positioning system independently developed by China. The three major functions of Beidou and GPS have appeared in the market, and there is a problem of switching between Beidou and GPS time scales in these products. The time scale signal of the Beidou system and the time scale signal of the GPS system At the same time, it is used as the tracking reference source of the local system, but the time scale signals of the Beidou system and the GPS system have systematic differences, and the delay error introduced by the unhealthy ephemeris, the transmission attenuation of the wireless link, the multipath effect, and the external interference

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  • COMPASS and GPS double system second difference switching method

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Embodiment 1

[0017] Such as figure 1 The overall design block diagram of the present invention shown, it comprises phase detector 1, time difference identification module 2 and intelligent control module 3; Phase detector 1 realizes by hardware platform FPGA, measures the phase difference of Beidou system and GPS system identification signal ; Send the phase difference to the time difference identification module 2 for statistical analysis, and correct it; send the analyzed identification difference to the intelligent control module 3 for switching process control.

[0018] The Beidou system time scale enters the first phase detector, the GPS system time scale enters the second phase detector, and the local time scale enters the two phase detectors 1 at the same time. The phase detector is a high-precision phase detector, which is used to measure the phase difference between time scale signals. This phase detector measures the time interval between the rising edges of two timing signals. ...

Embodiment 2

[0023] It is basically the same as Embodiment 1, but in the design of the switching method, considering that abnormal situations may occur, the following technical solutions are adopted: if the system difference between the Beidou time scale signal and the GPS time scale signal exceeds the limit due to abnormal reasons, this The system first indicates that the 1PPS of the system is unavailable, and on the basis of accurately identifying the system error, switches by adjusting the phase of the local time scale to avoid excessive switching time.

[0024] In addition, this switching method can make the system switch between Beidou and GPS multiple times without accumulative difference.

[0025] At the same time, the present invention is also applicable to switching between time scales of other time service systems.

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Abstract

A dual system second time difference switch method of Northern dipper and GPS involves a phase discriminator and is characterized by also involving a time difference identification module and an intelligent control module; the phase discriminator is realized through a hardware platform FPGA and the phase difference of timing signal of the Northern dipper system and GPS is measured out; the phase difference is sent to the time difference identification module for statistical analysis and amendment; the identification difference after analysis is sent to the intelligent control module for the control in switching process. The high precision phase discriminator in the invention continuously carries out phase discrimination for local time scale and the time scale of the Northern dipper system and for local time scale and the time scale of GPS as well; the long-term statistics for value of phase difference is implemented to obtain an accurate value of phase difference, finally the time-frequency output quantity is slowly adjusted. The method well solves the integration problem between the Northern dipper system and GPS and significantly improves the integral time service performance of product.

Description

technical field [0001] The invention relates to a time difference switching method, in particular to a second time difference switching method of Beidou and GPS dual systems. technical background [0002] At present, satellite timing equipment under the GPS system is widely used in our country, but there are great potential safety hazards. The "Beidou-1" satellite navigation and positioning system is an all-weather, regional satellite navigation and positioning system independently developed by China. The three major functions of Beidou and GPS have appeared in the market, and there is a problem of switching between Beidou and GPS time scales in these products. The time scale signal of the Beidou system and the time scale signal of the GPS system At the same time, it is used as the tracking reference source of the local system, but the time scale signals of the Beidou system and the GPS system have systematic differences, and the delay error introduced by the unhealthy ephem...

Claims

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Application Information

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IPC IPC(8): G01S1/02G01S5/02
Inventor 贾小波杨玉清吴淑琴邹世合张筱南
Owner 郑州威科姆科技股份有限公司
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