CPFSK demodulation device and method with fast automatic frequency compensation

Abstract

The invention provides a CPFSK demodulation device and method with rapid automatic frequency compensation. The method comprises the following steps: S1, starting the CPFSK demodulation device; S2, processing the radio frequency signal through the CPFSK demodulation device to obtain an input signal; and S3, respectively transmitting the input signal and the orthogonal signal of the local oscillator to the CPFSK demodulation device to obtain an output signal. The CPFSK demodulation device and method with the rapid automatic frequency compensation function have the advantages of being simple and easy to implement, low in hardware resource consumption, low in power consumption and small in size. Meanwhile, the method not only can realize large-range Doppler frequency offset capturing and tracking, but also can realize large-range Doppler change rate tracking. In addition, the calculation updating time of each error voltage is short, and the algorithm convergence speed is high. The method has the advantages of simple architecture, low hardware resource consumption, easiness in FPGA implementation and the like.

Description

technical field [0001] The invention belongs to the field of wireless telemetry and remote control, in particular to a CPFSK demodulation device and method with fast automatic frequency compensation. Background technique [0002] In the field of aerospace telemetry, the FM modulation system is the most widely used modulation system, because FM modulation has many advantages compared with other modulation methods such as phase modulation modulation. Frequency modulation technology in digital communication systems usually refers to FSK (Frequency Shift Keying, frequency shift keying), and CPFSK (Continuous Phase Frequency Shift Keying, continuous phase frequency shift keying) is a special FSK modulation, CPFSK modulation has phase continuous , constant envelope, fast out-of-band attenuation and high frequency band utilization. At present, the frequency modulation used in the field of telemetry is mostly CPFSK modulation technology; [0003] During use, due to the rapid movem...

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Problems solved by technology

[0004] At present, most of the existing CPFSK demodulation methods use non-coherent demodulation methods. This demodulation method has poor demodulation performance when the Doppler frequency deviation is large, and some demodulation methods have certain Doppler frequency deviation suppression. ability, but requires a long integration and adjustment time, and the frequency offset adjustment speed is slow. These methods have good suppression ability for fixed Doppler frequency offset, but they have the ability to follow the application scene with a fast Doppler change rate. poor

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