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Multi-channel navigation radio frequency receiver

A radio frequency receiver and multi-channel technology, applied in the field of navigation and communication, to achieve the effect of reducing demodulation error, filtering out-of-band interference, and improving image suppression performance

Inactive Publication Date: 2014-12-24
上海迦美信芯通讯技术有限公司
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Problems solved by technology

As far as the current market is concerned, the mainstream is still a single-channel navigation RF chip, such as only supporting GPS navigation

Method used

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  • Multi-channel navigation radio frequency receiver

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Embodiment Construction

[0025] Such as figure 2 As shown, the present invention provides a low-power navigation radio frequency receiver system architecture, which can simultaneously receive American GPS satellite signals, Chinese Beidou satellite signals, European Galileo satellite signals and Russian Glonass satellite signals. Multiple channels adopt double down-conversion system architecture.

[0026] Among them, the RF front-end shared by multiple channels includes: a low-noise amplifier 11 (LNA), an off-chip surface acoustic wave filter 21 (SAW FILTER), an RF pre-amplifier 31 (RFA), and a shared primary Quadrature downconverters 41 and 42 (Mixer I, Mixer Q). The local oscillator signals LOI and LOQ of the described primary quadrature down-converters 41 and 42 are provided by a single radio frequency phase-locked loop (RFPLL), that is, the radio frequency phase-locked loop is shared by multiple channels; The intermediate frequency signals output by the devices 41 and 42 include down-conversion...

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Abstract

The invention provides a multi-channel navigation radio frequency receiver. Multiple channels are arranged to correspondingly receive signals of multiple different navigation satellites; the multiple channels share a radio frequency front end and a radio frequency phase-locked loop of a frequency synthesizer, wherein the radio frequency front end carries out down-conversion on radio frequency signals received by the radio frequency front end for the first time through a primary orthogonal down converter, obtains one path of medium-frequency signals and outputs the signals to the multiple channels; corresponding secondary orthogonal down converters are arranged in the multiple channels respectively, and down-conversion is carried out on the medium-frequency signals for the second time to obtain medium-frequency conversion signals corresponding to the channels; the frequency synthesizer provides orthogonal local oscillator signals needed by the first time of down-conversion for the primary orthogonal down converter and provides orthogonal local oscillator signals needed by the second time of down-conversion for the secondary orthogonal down converters in the channels through frequency dividers different in frequency division coefficient. The multi-channel navigation radio frequency receiver not only saves power consumption, but also reduces the cost.

Description

technical field [0001] The invention relates to the design of a radio frequency chip in the field of navigation communication, in particular to a multi-channel navigation radio frequency receiver. Background technique [0002] At present, there are four global navigation systems GNSS (Global Navigation Satellite System): The first is the GPS navigation system of the United States, its radio frequency is 1575.42MHz, the bandwidth is 2.046MHz, and the C / A of time and position information is contained in the bandwidth code; the second is the Russian GLONASS navigation system, its radio frequency is 1598.0625MHz to 1605.375MHz, the bandwidth is 8MHz, divided into 14 channels, the interval between channels is 0.5625MHz, and the bandwidth of each channel is 0.5625MHz; the third The RF frequency of the second-generation COMPASS navigation system of China is 1561.098MHz, and the bandwidth is 4.092MHz; the fourth is the EU's Galileo (Galileo) navigation system, whose RF frequency is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/33
CPCG01S19/33
Inventor 韩业奇倪文海钱晓辉徐文华
Owner 上海迦美信芯通讯技术有限公司
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