PSK调制方式的无线信标机关键技术研究
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摘要
本文针对记录器搜寻困难的问题，提出了一种基于软件无线电思想的，以频率合成技术为依托的无线电信标机。这种信标机的设计采用软件无线电的思想，具有软件无线电的灵活性、幵放性的特点，以一个模块化的硬件平台作为依托，只通过软件的更改就能实现无线电台的各种功能。
信标机的硬件平台采用频率合成技术来实现，频率合成器是现代电子系统的重要组成部分。本文对目前存在的频率合成技术进行了对比，选择了各种性能倶佳的直接数字频率合成（DDS)技术，并利用DDS技术设计了模块化的信标机硬件平台。
本文在研究ADI公司的高性能DDS芯片AD9910的基础上，设计了基于AD9910的频率合成模块方案，利用AD9910进行了高频BPSK调制。设计的频率合成模块功能灵活，操作方便。同时选用高度灵活可操作的GPS模块，通过低功耗单片机完成对整个系统的控制，并设计了对应频段的射频电路，完成了信标机的设计。设计的信标机电路，在不更改硬件电路的基础上，只改变软件就可以对信标机的开关，工作频段，调制方式等进行更改，这符合软件无线电的思想。
经过测试，设计的电路满足信标机的要求，能够输出400MHz以上的BPSK调制信号，输出功率高达1.9W。通过软件的更改，可以输出370^410MHz的信号，能进行最高8级的PSK、FSK：、ASK的调制。
In this thesis, a kind of wireless beacon which is based on the sotfware defined radio andrelied on the frequency synthesis technique is designed to solve the problem that the recorderis difficult to search. This beacon adopts the sotfware defined radio technology, had thefeature of lfexibility and openness, and relied on a modular hardware platform. It can achievevarious functions of the radio by changing the sotfware.
The frequency synthesizer is an important part of modern electronic system, so thehardware platform of beacon receiver in this thesis is realized by frequency synthesistechnology. Atfer compairng the frequency synthesis technology at present, this thesis selectsthe DDS technology whose performance is good. At last, the thesis designs the modulairzedhardware platform of beacon receiver by DDS technology.
On the basis of the study of ADI's high-performance DDS chip AD9910, a programbased on the AD9910 frequency synthesizer module is designed, used the AD9910 modulatedthe BPSK signal which is up to 400MHz. this module is lfexible, and is easily to operate.Using flexible operational GPS module, using low-power microcontroller to control the entiresystem, and designed the RF circuit of the corresponding band, completed the design ofbeacons. The circuit of beacon receiver designed in this thesis can alter the beacon receiver'sswitch, working frequency and modulation by only changing the software and not changingthe hardware circuit, which is accord with the thought of software radio.
Atfer testing, design of the circuit could meet the requirements of the beacon, it couldOutput 400MHz BPSK modulated signal and the output power could up to 1.9W. Bychanging the Sotfware, it can output signal rfom 370 to 410MHz, and can output 8 PSK、FSKor ASK modulation signal.
信标机的硬件平台采用频率合成技术来实现，频率合成器是现代电子系统的重要组成部分。本文对目前存在的频率合成技术进行了对比，选择了各种性能倶佳的直接数字频率合成（DDS)技术，并利用DDS技术设计了模块化的信标机硬件平台。
本文在研究ADI公司的高性能DDS芯片AD9910的基础上，设计了基于AD9910的频率合成模块方案，利用AD9910进行了高频BPSK调制。设计的频率合成模块功能灵活，操作方便。同时选用高度灵活可操作的GPS模块，通过低功耗单片机完成对整个系统的控制，并设计了对应频段的射频电路，完成了信标机的设计。设计的信标机电路，在不更改硬件电路的基础上，只改变软件就可以对信标机的开关，工作频段，调制方式等进行更改，这符合软件无线电的思想。
经过测试，设计的电路满足信标机的要求，能够输出400MHz以上的BPSK调制信号，输出功率高达1.9W。通过软件的更改，可以输出370^410MHz的信号，能进行最高8级的PSK、FSK：、ASK的调制。
In this thesis, a kind of wireless beacon which is based on the sotfware defined radio andrelied on the frequency synthesis technique is designed to solve the problem that the recorderis difficult to search. This beacon adopts the sotfware defined radio technology, had thefeature of lfexibility and openness, and relied on a modular hardware platform. It can achievevarious functions of the radio by changing the sotfware.
The frequency synthesizer is an important part of modern electronic system, so thehardware platform of beacon receiver in this thesis is realized by frequency synthesistechnology. Atfer compairng the frequency synthesis technology at present, this thesis selectsthe DDS technology whose performance is good. At last, the thesis designs the modulairzedhardware platform of beacon receiver by DDS technology.
On the basis of the study of ADI's high-performance DDS chip AD9910, a programbased on the AD9910 frequency synthesizer module is designed, used the AD9910 modulatedthe BPSK signal which is up to 400MHz. this module is lfexible, and is easily to operate.Using flexible operational GPS module, using low-power microcontroller to control the entiresystem, and designed the RF circuit of the corresponding band, completed the design ofbeacons. The circuit of beacon receiver designed in this thesis can alter the beacon receiver'sswitch, working frequency and modulation by only changing the software and not changingthe hardware circuit, which is accord with the thought of software radio.
Atfer testing, design of the circuit could meet the requirements of the beacon, it couldOutput 400MHz BPSK modulated signal and the output power could up to 1.9W. Bychanging the Sotfware, it can output signal rfom 370 to 410MHz, and can output 8 PSK、FSKor ASK modulation signal.
引文
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