Radio frequency front end device of receiver and signal receiving method thereof

Abstract

The invention discloses a radio frequency front end device of a receiver and a signal receiving method thereof and belongs to the field of radio communication and satellite positioning and navigation. The device comprises two mutually-independent and parallel signal channels. Each signal channel is connected as follows: a low noise amplifier, a surface acoustic wave filter, a radio amplifier, a quadrature output down-converter, a correction buffer and a multi-mode filter are connected in series; the output end of the multi-mode filter is connected with the input end of a controllable gain amplifier; the output end of the controllable gain amplifier is respectively connected with the input end of an automatic gain controller and the input end of a multi-mode analogue / digital converter; and the output end of the automatic gain controller is connected with a gain control end of the controllable gain amplifier. The invention has the advantages as follows: the radio frequency front end device has system-level and module-level reconfigurability, supports all kinds of the traditional global positioning systems to be the maximum and greatly improves the flexibility of use for users. The radio frequency front end device has strong robustness.

Description

technical field [0001] The invention belongs to the field of wireless communication and satellite positioning and navigation, in particular to a receiver radio frequency front-end device and a signal receiving method thereof. Background technique [0002] Since the establishment of the United States' Global Positioning System (GPS) in the 1990s, satellite positioning and navigation technology has been widely used in military, aerospace, scientific exploration, civil transportation and other fields. At the same time, in order to get rid of technology dependence and optimize for national applications, countries have accelerated the pace of research and development of satellite navigation systems based on national or regional services. These include Russia's GLONASS global navigation satellite system, the European Union's Galileo positioning system and China's Beidou (or Compass) satellite navigation system. Taking China's Beidou satellite navigation system as an example, with...

AI Technical Summary

Problems solved by technology

This makes the noise figure of the receiver higher, which makes it impossible to achieve high-sensitivity reception; in addition, it causes waste of hardware resources and power consumption when receiving low-frequency and low-bandwidth signals

Finally, according to the description in its implementation, when the system receives multiple (for example, two) frequency band navigation signals at the same time, it will switch the working modes of multiple modules of the RF front-end at a speed at least twice the sampling frequency, which will limit the The bandwidth of the navigation signal that can be processed is the receiver accuracy, and the resulting huge power consumption

[0006] The existing dual-frequency receiver radio frequency front-end device (such as Chinese patent CN101915932A) adopts a dual-channel superheterodyne structure to receive two navigation signals at the same time, because its dual-channel is simply obtained by duplicating a single channel; and it is used twice Frequency conversion structure, high hardware and power consumption overhead

In addition, the device uses two frequency synthesizers on a single chip to generate radio frequency oscillation signals with very close frequencies. The signal crosstalk between the two channels will be very serious, which will reduce the sensitivity of the receiver and reduce the receiving accuracy.

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