Navigation receiver anti-saturation device based on direct radio frequency sampling

A technology of radio frequency direct sampling and navigation receiver, applied in measuring devices, satellite radio beacon positioning systems, instruments, etc., can solve the problems of complex implementation of radio frequency AGC circuit and complex design of analog circuit of portable navigation receiver, etc., and achieve strong anti-corrosion Burst jamming capability, increased market competitiveness, and reduced complexity

Active Publication Date: 2013-09-25
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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Problems solved by technology

[0003] In view of the wide bandwidth of the analog channel caused by the simultaneous reception of multiple carrier frequencies in the existing BD, GPS, GALIELO and GLONASS multi-mode navigation receivers, when using radio frequency

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  • Navigation receiver anti-saturation device based on direct radio frequency sampling
  • Navigation receiver anti-saturation device based on direct radio frequency sampling
  • Navigation receiver anti-saturation device based on direct radio frequency sampling

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[0023] specific implementation method

[0024] The structural principle of the present invention will now be described in detail in conjunction with the accompanying drawings.

[0025] see figure 1 , an anti-saturation device for a navigation receiver based on radio frequency direct sampling, wherein it is composed of a radio frequency amplification unit 1, a clamping circuit unit 2, an attenuator unit 3 and a low-pass filter unit 4; wherein the radio frequency amplification unit The signal receiving end of 1 is connected with the radio frequency band-pass filter outside the device, and the signal output end of the radio frequency amplification unit 1 is connected in series with the clamping circuit unit 2, the attenuator unit 3 and the low-pass filter unit 4 in sequence, and the low The signal output end of pass filter unit 4 is connected with the analog-to-digital converter outside the device; the concrete structure of each unit is:

[0026] see figure 2 , the radio f...

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Abstract

The invention provides a navigation receiver anti-saturation device based on direct radio frequency sampling. The device aims to solve the difficulties that an existing multimode navigation receiver receives multiple carrier frequencies at the same time, and accordingly an existing analog circuit is very complicated in design and high in manufacturing cost. The device is composed of a radio frequency amplifying unit, a clamp circuit unit, an attenuator unit and a low-pass filter unit. A signal receiving end of the radio frequency amplifying unit is connected with a radio frequency band-pass filter outside the device. A signal output end of the radio frequency amplifying unit is sequentially in serial connection with the clamp circuit unit, the attenuator unit and the low-pass filter unit. The navigation receiver anti-saturation device has the advantages of solving the difficulties that according to the multimode navigation receiver based on direct radio frequency sampling, strong interference of signals causes ADC sampling saturation, effectively reducing design complexity of the multimode navigation receiver, and meeting dynamic requirements of a radio frequency receiver.

Description

technical field [0001] The invention relates to the technical field of receiver design, in particular to an anti-saturation device for a navigation receiver based on radio frequency direct sampling. Background technique [0002] The existing navigation receivers based on the GPS single system are affected by the use environment, such as in dense forests or in the shelter of dense urban buildings, etc., the number of observable satellites is often less than 4, which makes it impossible to complete three-dimensional positioning tasks. However, the joint positioning of GPS dual-system or multi-system navigation terminals can overcome the above-mentioned defects of GPS single-system. However, when developing GPS dual-system and multi-system navigation terminals, there is a technical problem: the current architecture of navigation receivers is basically based on "two-chip computers", that is, using radio frequency front-end and baseband processing. The RF front-end uses superhe...

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Application Information

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IPC IPC(8): G01S19/21
Inventor 朱家兵洪一孙金中郭锐谢凤英
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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