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Method for selective calling

A calling method and selective calling technology, applied in the field of communications, can solve the problems of narrow frequency range of call signals and poor portability

Active Publication Date: 2012-09-12
西安烽火电子科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, DTMF technology still has the following disadvantages: DTMF is mainly implemented by hardware, and its portability is poor; the frequency range of DTMF call signals is relatively narrow; DTMF can only detect fixed frequencies, that is, the frequency values ​​at both ends of the transceiver are the same

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Embodiment Construction

[0033] The main idea of ​​the technical solution of the present invention is: the sending end obtains the specific frequency of the sending end according to the selective calling code, and generates a call signal with the specific frequency of the sending end, and transmits the calling signal through a short-wave channel; the receiving end receives and detects the confirmation calling signal, And compare the frequency of the calling signal with the specific frequency of the receiving end to determine whether the sending end has sent the selective calling signal of the receiving end.

[0034] The selective call method includes the generation of the signal at the sending end and the demodulation and judgment of the signal at the receiving end, and is implemented in software.

[0035] Since the highest frequency of the selective calling code is 1479.1 Hz, according to the sampling theorem and the principle of universality, the sampling rate here is 3600 Hz. Firstly, the correspon...

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Abstract

The invention, which relates to the communication technology field, discloses a method for selective calling. The method comprises the following steps that: a sending terminal obtains sending terminal specific frequency according to a selective calling code and a calling signal having the sending terminal specific frequency is generated and is then transmitted through a shortwave channel; and a receiving terminal receives and detects the calling signal for confirmation, the frequency of the calling signal is compared with the sending terminal specific frequency, and it is determined whether the sending terminal sends a selective calling signal of the receiving terminal. According to the invention, the technical scheme is realized by employing software, so that portability is high; and frequency and frequency offset requirements of a selective calling signal can be simultaneously met. Synchronization probability can reach over 99% in a simulated actual flight environment and a correct demodulation rate can reach over 95%.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically relates to a selective calling method. Background technique [0002] The selective call system on the aircraft has a specific four-letter code, each letter is equivalent to a different single tone signal (see Table 1, single tone frequency and selection code table), the ground call center knows all the calls within its jurisdiction The aircraft's selective calling code. First, the HF or VHF on the ground sends a call signal to the aircraft to be called, and the pulse contains a four-character code (see figure 1 ), and the communication system on the aircraft has been tuned to the designated frequency, the HF or VHF on the aircraft receives the calling signal from the ground, if the calling code is the same as the selective calling code of the aircraft, the decoder will connect the cockpit signal lights and The sounder is connected to notify the pilot to make ...

Claims

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Application Information

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IPC IPC(8): H04M3/30H04M3/436H04Q1/457
Inventor 李召恒马洪峰秦艳张亦希陈测库王小军
Owner 西安烽火电子科技有限责任公司
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