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AM/Chirp modulation, realizing device thereof and emergency broadcast and communication system based on common AM/Chirp modulation

A modulated baseband, common technology, applied in the field of emergency broadcasting system, can solve the problems of complex composition, uncomfortable working for a long time, high power consumption, etc.

Inactive Publication Date: 2012-12-19
周运伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual emergency treatment (such as carrying, avoiding, running) process, it is difficult to keep those AM radios equipped with simple tuning devices (such as tuning knobs) on a specific channel all the time. However, AM radios using complex tuning devices (such as digital phase-lock tuning) are not suitable for long-term work in emergency response due to large power consumption and complex composition; therefore, existing AM radios can be used, and It does not require precise tuning of existing AM radios, which is a function that emergency AM radio transmitting equipment should have

Method used

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  • AM/Chirp modulation, realizing device thereof and emergency broadcast and communication system based on common AM/Chirp modulation
  • AM/Chirp modulation, realizing device thereof and emergency broadcast and communication system based on common AM/Chirp modulation
  • AM/Chirp modulation, realizing device thereof and emergency broadcast and communication system based on common AM/Chirp modulation

Examples

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Embodiment 1

[0069] This embodiment is used to illustrate the implementation process of AM / Chirp modulation provided by the present invention. see figure 1 As shown in (a), the baseband signal Ω(t) to be modulated is sent into the amplitude modulator (11) to carry out amplitude modulation on the Chirp pulse carrier c(t) used as the primary modulation carrier, and the amplitude modulator (11) outputs The composite modulated carrier s(t) of is used as the communication signal.

[0070] When the specific method of amplitude modulation on the Chirp pulse carrier c(t) is ordinary AM modulation, the formed composite modulated carrier s(t) (that is, ordinary AM / Chirp modulated carrier) is as follows figure 1 (c) shown. Obviously, ordinary AM / Chirp modulation is to replace the sinusoidal carrier in traditional ordinary AM modulation with Chirp pulse carrier. Since the Chirp pulse carrier is a broadband signal, the ordinary AM / Chirp modulated carrier is also a broadband signal. Since the carrie...

Embodiment 2

[0072] This embodiment is used to illustrate the implementation method of the first common AM / Chirp modulator provided by the present invention. The analog multiplier chip MC1496 / MC1596 produced by MOTOROLA can be used to realize such as figure 2 The signal processing functions of the adder (21) and the multiplier (22) in the shown AM / Chirp modulator; Continue to use the existing common AM modulator that adopts MC1496 / MC1596 to build, adopt Chirp pulse carrier as the modulation carrier, then its The multiplication result of the output is the ordinary AM / Chirp modulated carrier; by adjusting the position of the zero adjustment potentiometer between the 1st and 4th pins to make the DC component 0, DSB / Chirp modulation can also be realized.

Embodiment 3

[0074] This embodiment is used to illustrate the implementation method of the second common AM / Chirp modulator provided by the present invention. The traditional collector amplitude modulation circuit can realize such image 3 Shown variable gain amplifier (31); but, when the bandwidth of the Chirp pulse carrier used as the modulation carrier is larger, then need to represent the LC resonant coil on the collector in the collector amplitude modulation circuit with resistance. The RF2516 chip produced by RFMD can also be used to implement such as image 3 The variable gain amplifier (31) in the common AM / Chirp modulator shown can also take into account the generation of Chirp pulse carrier; wherein, the baseband signal to be modulated is input from the modulation terminal (the 8th pin) to control its reference oscillation circuit (The first pin OSCB and the second pin OSCE) the parameter of the reactance element (typically capacitance value) changes according to the sweeping ru...

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Abstract

The invention relates to an AM / Chirp modulation, a realizing device of the AM / Chirp modulation and an emergency broadcast and communication system based on the common AM / Chirp modulation, belonging to the field of emergency communication. As for the AM / Chirp modulation, a composite modulation carrier wave formed by using baseband signals to be modulated to perform amplitude modulation to a Chirp pulse carrier wave is regarded as communication signals. The invention further provides three modulators for realizing the AM / Chirp modulation and the emergency broadcast and communication system based on the common AM / Chirp modulation. The AM / Chirp modulation manner provided by the invention is an improvement of the existing amplitude modulation manner, convenient for large bandwidth coverage. As for the emergency broadcast and communication system based on the common AM / Chirp modulation, one common AM / Chirp modulated carrier wave is transmitted to realize broadcast and communication coverage to multiple narrow-band common AM carrier wave channels, without the requirement to a narrow-band AM receiving terminal to accurately tune the receiving frequency, so that the narrow-band AM receiving devices can receive the emergency broadcast and communication information in time.

Description

technical field [0001] The invention relates to an AM / Chirp modulation, its realization device and an emergency broadcast system based on common AM / Chirp modulation, belonging to the field of emergency communication. Background technique [0002] Amplitude modulation is a kind of modulation method that was used earlier in the field of radio communication and is still in use today; among them, ordinary AM modulation with carrier component is the most classic amplitude modulation method, and there are many types of amplitude modulation such as DSB, SSB, VSB, etc. Modulation. Ordinary AM modulation has long been used in medium-wave AM broadcasting, SSB modulation is mainly used in short-wave communication, and VSB modulation is mainly used in TV broadcasting. [0003] Chirp modulation, also known as sweep frequency modulation, is a spread spectrum modulation method formed by controlling the frequency of the sinusoidal carrier to make a large-scale monotonous change over time a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/32
Inventor 周运伟
Owner 周运伟
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