Dual-mode time service machine

Abstract

The invention relates to the field of electronic product production testing, and particularly relates to a dual-mode time service machine. The time service machine comprises a Beidou 2nd generation / GPS dual-mode receiver module, a power supply module, a counting module, a CPU control module and an output module. According to the invention, satellite signals are received by using a Beidou 2nd generation / GPS dual-mode receiver, dual-channel running of a Beidou 2nd satellite and a GPS satellite is ensured, the stability of a signal source is ensured, the counting module selects a constant temperature crystal oscillator module, a Beidou 1pps random error mathematic model is built, and a Beidou 1pps random error is corrected online, so that a random error of Beidou second pulse signals can be effectively eliminated, and the time precision is improved. Meanwhile, the power supply module of the dual-mode time service machine utilizes a photovoltaic effect of solar cells, thereby achieving effects of energy conservation, stable power supply and convenient installation.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of production and testing of electronic products, in particular to a dual-mode granting opportunity. [0003] 【Background technique】 [0004] The timing of satellite delivery is the time reference in many fields of communication, navigation, and radar. During the development and production process, 1PPS second pulse, cold start time of power-on, and positioning accuracy are all indicators that need to be evaluated for satellite delivery timing and navigation receivers. But because the above-mentioned signals need to appear once every second, the researchers cannot keep up with the signal changes by manually measuring and recording. At present, there are five timing methods: long-wave and short-wave timing, telephone dial-up timing, SDH network timing, computer Internet timing and satellite timing. The short-wave timing can only reach the millisecond level, and the transmission quality is affected by the ionos...

AI Technical Summary

Problems solved by technology

However, the transmission of timing information will be blocked by the multiplex section overhead of the SDH network. Therefore, this timing method is not reliable; satellite timing is the mainstream timing method in today's information society, and the GPS in the United States plays a leading role. From a security perspective Considering that with the implementation of the Beidou second-generation satellite navigation system network, it is inevitable to replace GPS timing products with Beidou timing products

[0005] At present, in order to overcome the security loopholes of the GPS timing method and block the monopoly position of the United States in GPS timing, the timing operation using the Beidou second-generation satellite navigation system network has become the research direction of many industry experts. However, the Beidou second-generation The system can realize one-way timing with a timing accuracy of 50ns, which can meet most application requirements, but it cannot meet the requirements of high time accuracy applications, and the current application solutions of this type are mainly based on systems built with discrete components, and the implementation cost High, bulky, and limited in application. For example, the Chinese patent CN 104460310 A applied by the inventor on November 19, 2014 discloses a dual-mode timing. The timing channel of this timing is mainly from the Beidou second-generation satellite system. Although it is higher than GPS, its safety and reliability are relatively low, and it cannot be separated from the grid circuit

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