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Multi-satellite navigation system compatible GNSS (Global Navigation Satellite System) signal receiving method and correlator thereof

A satellite navigation system and signal receiving technology, applied in the field of satellite communication, can solve the problem of not being able to receive satellite signals, etc.

Active Publication Date: 2011-06-15
杭州中科微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent No. CN1285045, the patent titled "Digital Correlator", proposes a digital correlator for GPS and GLONASS pseudo-noise signal receivers, which can receive GPS and GLONASS satellite signals, but cannot receive Galileo system and Beidou system satellites Signal

Method used

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  • Multi-satellite navigation system compatible GNSS (Global Navigation Satellite System) signal receiving method and correlator thereof
  • Multi-satellite navigation system compatible GNSS (Global Navigation Satellite System) signal receiving method and correlator thereof
  • Multi-satellite navigation system compatible GNSS (Global Navigation Satellite System) signal receiving method and correlator thereof

Examples

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no. 1 example

[0166] figure 1 It is a structural block diagram of the correlator in the present invention. The correlator consists of multiple independent correlation channels 100a, 100b and 100c and a latch such as figure 1 The shown 100a, 100b and 100c respectively correspond to different channels, and the structures of different channels are the same, and all relevant channels share one latch 102 . Each multi-system correlation channel consists of a multiplier group (103, 104 and 108) including a multiplier 1, a multiplier 2 and a multiplier 3, an integral and clear circuit 105, an accumulation data register 106, a carrier NCO107, a code NCO109, a pseudo It consists of a random code generator 110 and an OR gate 111 for selecting a modulation system. The intermediate frequency signal input end of multiplier 103 is connected the output end of intermediate frequency signal latch, the carrier signal input end of multiplier 103 is connected the output end of carrier NCO107, and two signal i...

no. 2 example

[0169] figure 2 It is a schematic block diagram of the structure of the carrier NCO according to the embodiment of the present invention. The phase accumulator and its frequency control word in one embodiment of the carrier NCO are both 32-bit wide, and the phase accumulator 202 continuously accumulates the frequency control word. If the accumulated result exceeds the range represented by the 32-bit data, it will automatically overflow and continue add up. The frequency control word 201 is connected to the input end of the phase accumulator 202, and the accumulating step size of the phase accumulator 202 is controlled by the bit width of the frequency control word. The output terminal of the phase accumulator 202 is connected to the sine wave mapping table 203. After the phase accumulator 202 accumulates each time, its upper 3 bits are used as the quantized phase, and are output to the sine wave mapping table 203 to obtain the corresponding sine value and The sine value wit...

no. 3 example

[0171] image 3 It is a schematic block diagram of the structure of the code NCO of the embodiment of the present invention. The phase accumulator and its frequency control word in one embodiment of the code NCO are all 32-bit wide, and the frequency control word 301 is connected to the input end of the phase accumulator 302, and controls the accumulation step of the phase accumulator 302 with the frequency control word bit width long. The 302 phase accumulator continuously accumulates the frequency control word. If the accumulated result exceeds the range represented by the 32-bit data, it will automatically overflow and continue to accumulate. The frequency control word 301 determines the accumulation step size of the phase accumulator 302, and controls the data overflow frequency of the phase accumulator, that is, the inversion frequency of the highest bit of the phase accumulator, that is, the sign bit. The output terminal of the phase accumulator 302 is connected to the...

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Abstract

The invention provides a multi-satellite navigation system compatible GNSS (Global Navigation Satellite System) signal receiving method which supports the receiving of satellite signals of a GPS (Global Position System), a GLONASS (Global Navigation Satellite System), a Big Dipper navigation system and a Galileo satellite navigation system at present. The invention also discloses a multi-satellite navigation system compatible GNSS signal receiving correlator which comprises N multi-system correlated channels, wherein each multi-system correlated channel mainly comprises a carrier numerical controlled oscillator (NCO), a code NCO, a pseudo-random code generator and an integrating and zero clearing module; each code NCO is used for outputting a pulse sequence for triggering the pseudo-random code generator and also generating square signals with the same rate as subcarrier signals in a BOC (1, 1) signal demodulation mode; each pseudo-random code generator can generate 14 grades of pseudo-random codes at most; and each integrating and zero clearing module has an overflow protection function and improves the reliability. The multi-satellite navigation system compatible GNSS correlator can be compatible with four satellite systems, effectively improves the reliability and the continuity of navigation and positioning and obviously reduces the use risk of single-system navigation.

Description

field of invention [0001] The invention belongs to the technical field of satellite communication, and relates to a signal receiving method of a GNSS receiver, in particular to a multi-satellite navigation system compatible satellite signal receiving method and a correlator module of the receiver. Background technique [0002] The Global Navigation Satellite System (GNSS) has been widely used in vehicle navigation, portable navigators, and wireless communication equipment. Major mobile communication service providers are also actively developing applications based on location services (LBS) to provide users with effective and reliable information based on Multiple services for positioning functions. This requires the GNSS receivers in various communication and navigation devices to be able to continuously navigate and position under various environments. Generally speaking, at least 4 satellite signals need to be received to complete navigation and positioning. However, in ...

Claims

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Application Information

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IPC IPC(8): G01S19/33
Inventor 何文涛徐建华殷明
Owner 杭州中科微电子有限公司
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