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Fast frequency hopping synchronization method based on time of day (TOD) information

A technology of frequency hopping synchronization and synchronizing information, applied in electrical components, transmission systems, etc., can solve problems such as reducing anti-interference performance, and achieve the effect of ensuring anti-interference and anti-interception

Inactive Publication Date: 2012-10-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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Problems solved by technology

Although this method can achieve synchronization, the introduction of slow frequency hopping in synchronous hopping greatly reduces the improvement of anti-interference performance brought by fast frequency hopping

Method used

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  • Fast frequency hopping synchronization method based on time of day (TOD) information
  • Fast frequency hopping synchronization method based on time of day (TOD) information
  • Fast frequency hopping synchronization method based on time of day (TOD) information

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Embodiment Construction

[0032]Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so that those skilled in the art can better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0033] In this embodiment, the sender first reads the local system clock (Time of Day, referred to as TOD), and converts it into two parts: TOD high segment TODH and TOD low segment TODL, and TOD high segment TODH takes one minute as the timing unit , TOD low-segment TODL takes frequency hopping interval milliseconds as the timing unit, TOD low-segment TODL is added to TOD high-segment TODH every minute, so TOD low-segment TODL only needs 16 bits; TOD high-segment TODH is represented by 30 bits , a total of 2042.89 years can be represented, and this representation method mee...

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Abstract

The invention discloses a fast frequency hopping synchronization method based on time of day (TOD) information. The method comprises the following steps of: forming a frequency matrix consisting of n groups of working frequency produced by a transmitting end according to time of day of a high section (TODH) and front and back (n-1) / 2 values and an agreed algorithm, selecting frequencies on diagonals as working frequencies, and transmitting synchronous information by adopting frequency modulation; producing a group of waiting frequencies by a receiving end according to the TODH and the same algorithm, wherein the waiting frequencies and received signals undergo frequency mixing, band-pass filtration and square law detection, and the number of the waiting frequency with the maximum value reflects deviation of TOD information of the receiving end and the transmitting end; and adjusting the TODH of the TOD information of the receiving end according to the number of the waiting frequency. Therefore, the synchronous frequencies can be changed together with change of the TOD, anti-interference performance and intercepting resistance of a frequency hopping system are ensured, meanwhile, the TODH of the TOD is adjusted under the condition that related codes are not transmitted, and the aim of synchronization of the frequency hopping system is quickly and accurately fulfilled.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to a fast frequency hopping synchronization method based on TOD information. Background technique [0002] Because of its strong anti-interference ability, anti-interception ability and confidentiality performance, frequency hopping communication has unique advantages in modern electronic warfare, and has become one of the most widely used and most effective technologies in communication anti-interference technology. [0003] According to the relationship between frequency hopping rate and symbol transmission rate, frequency hopping communication can be divided into fast frequency hopping communication and slow frequency hopping communication. If the frequency hopping rate is higher than the symbol rate output by the information modulator, one information symbol needs to occupy more frequency hopping time slot, it is called fast frequency hopping, on t...

Claims

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Application Information

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IPC IPC(8): H04B1/7156
Inventor 邝育军窦秀娟杨峰焦樑易翔赵贤李鹏程
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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