A cpfsk demodulation device and method with fast automatic frequency compensation

Abstract

The invention provides a CPFSK demodulation device and method with fast automatic frequency compensation, comprising the following steps: S1, starting the CPFSK demodulation device; S2, obtaining an input signal after the radio frequency signal is processed by the CPFSK demodulation device; S3, The input signal and the quadrature signal of the local oscillator are respectively transmitted to the CPFSK demodulation device to obtain the output signal. The CPFSK demodulation device and method with fast automatic frequency compensation described in the present invention have the characteristics of simple and easy implementation, less consumption of hardware resources, low power consumption and small size. At the same time, this method can not only realize the capture and tracking of Doppler frequency offset in a wide range, but also track the Doppler change rate in a wide range. Another feature of the invention is that the calculation update time of each error voltage is short, and the algorithm convergence speed is fast; the method has many advantages such as simple structure, less consumption of hardware resources, and easy FPGA implementation.

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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