pdt walkie talkie with integrated ais codec capability

A walkie-talkie, codec technology, applied in the transmission modification based on link quality, two-party line system station, digital transmission system, etc., can solve the problems of poor portability, volume, power consumption disadvantages, etc., and achieve easy call for help , improve portability, improve the effect of standby time

Active Publication Date: 2022-01-07
天津七一二移动通信有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

PDT walkie-talkie and AIS use similar frequency points, but there are big differences in channel bandwidth, modulation method, frame structure, etc. In previous equipment, multiple baseband or even multi-channel radios were often used to achieve the same equipment with two functions. , has great disadvantages in terms of volume and power consumption, and the portability is not good

Method used

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  • pdt walkie talkie with integrated ais codec capability
  • pdt walkie talkie with integrated ais codec capability
  • pdt walkie talkie with integrated ais codec capability

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with drawings and embodiments.

[0033] Such as figure 1 As shown, the equipment hardware is composed of antenna, channel machine unit, baseband unit and display unit; the antenna is used to receive and transmit radio frequency signals, the channel machine has high-speed sampling capability, processes radio frequency signals into baseband signals, and the baseband unit stores high-speed sampling The waveform characteristics of the synchronization word of the AIS mode message and the PDT mode message and the pre-distortion algorithm for the channel machine, the same channel machine can send and receive GMSK modulated messages in AIS mode and 4FSK modulated messages in PDT mode; typical example is 96KHz sampling rate The IQ signal is also responsible for modulating the baseband signal of the transmission path to the carrier to generate a radio frequency signal. The baseband unit is used for signal proce...

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Abstract

The invention discloses a PDT walkie-talkie with integrated AIS encoding and decoding capability. The walkie-talkie includes an antenna, a channel unit, a baseband unit and a display unit. The AIS is a GMSK modulation mode, and the PDT is a 4FSK modulation mode. The channel unit has high-speed AD sampling Capability, the baseband unit stores the modulation and synchronization word waveform characteristics of AIS mode messages and PDT mode messages under high-speed sampling, and the walkie-talkie contains receiving and transmitting processes. Using the same set of channel machine and baseband unit is compatible with PDT and AIS modes, which greatly improves the portability of the device and effectively improves the standby time. Maritime operators can easily carry the device to communicate with PDT or use AIS messages for help. Using the same channel unit and baseband unit to automatically identify the signal mode, users can receive services in the two modes without manual switching, allowing them to focus more on on-site operations and initiate help calls more easily.

Description

technical field [0001] The invention relates to a digital walkie-talkie and an AIS (Automatic Identification System), in particular to a PDT walkie-talkie with integrated AIS encoding and decoding capabilities, especially for marine PDT walkie-talkie terminals. Background technique [0002] In the current field of maritime communication, AIS and walkie-talkies are commonly used equipment. AIS has a very high frequency of use in maritime collision avoidance, positioning, and information communication. It is generally used for discovery and interaction between ships and ships, and between ships and land. , management, help. In particular, if the people and objects in the water have the AIS rescue capability, the probability of being rescued can be greatly improved. PDT walkie-talkies are widely used equipment for short-distance communication on ships and fleets. They are frequently used and easy to carry. PDT walkie-talkie and AIS use similar frequency points, but there are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/12H04L27/14H04L25/49H04L1/00H04B1/40H04Q5/24
CPCH04L27/12H04L27/14H04B1/40H04L1/0003H04L25/49H04Q5/24
Inventor 秦嗣波展晓洁张海超汪轩向浩威雷志芳
Owner 天津七一二移动通信有限公司
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