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An Adaptive Counting Clock Data Detection Method

A technology of counting clock and data detection, applied in the field of satellite communication, to achieve the effect of strong anti-interference ability

Active Publication Date: 2017-05-10
西安航天恒星精密机电有限责任公司
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  • Application Information

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Problems solved by technology

The extended multi-choice load data adaptive identification method is used to solve the multi-choice load clock data selection problem

Method used

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  • An Adaptive Counting Clock Data Detection Method
  • An Adaptive Counting Clock Data Detection Method
  • An Adaptive Counting Clock Data Detection Method

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Embodiment Construction

[0022] The method for detecting data of an adaptive counting clock according to the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The method according to the invention is based on the following design principles:

[0024] The method of the present invention is realized by FPGA software algorithm, utilizes local clock to carry out real-time identification (or detection) to generate an active high flag signal. Since the clock and data are synchronized, the independent identification and detection of the load data of the road can be realized by identifying the clock.

[0025] The algorithm customizes the nominal count value Considering that the duty cycle of the general clock has a margin of ±5%, the value of the defined redundancy n is 0.05 times the nominal count value COUNT, and n≥2, thus, the nominal count value COUNT≥ can be deduced inversely 40 design requirements. Then by ...

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Abstract

The invention discloses a self-adaptive count clock data detection method. According to the self-adaptive count clock data detection method, a clock frequency input by a single external load is recognized in real time by means of a local clock according to a three-item counting method involving high level count, low level count and the sum of the high level count and the low level count, and thus automatic recognition of the data of the load is achieved; then, data of two loads are recognized automatically according to a logical combination algorithm, and thus self-adaptive switching of the clock data of the two loads is achieved according to countless switching commands in the system design. Self-adaptive recognition of the data of one of the multiple loads is achieved after expansion, and selection of the clock data of one of the multiple loads is achieved. The self-adaptive count clock data detection method is also suitable for the situations that externally input clock signals are broken clock signals, or constant-level signals or noise wave signals, and the antijamming capability is high.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and in particular relates to an adaptive counting clock data detection method, which is applicable to the adaptive identification of a single load, and is also applicable to the adaptive identification of two or more loads. Background technique [0002] Yaogan No. 9 satellite is my country's first electronic reconnaissance satellite constellation system. Yaogan No. X satellite is the follow-up star of Yaogan No. 9 satellite. The technical status of the whole satellite has changed, and AIS (Automatic identification System Ship Automatic Identification System) load equipment has been added. , the working mode adopts the working mode of time-sharing multiplexing with the integrated processor. For this reason, the design of the stand-alone interface of the data processor of the digital transmission subsystem has also changed, and the AIS input interface has been added. Adaptive real-t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/26H04J3/14H04B7/185
Inventor 张锐菊张建华李丹许婷方火能吴振国巴兆馨
Owner 西安航天恒星精密机电有限责任公司
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