High-dynamic satellite signal capturing method and system based on code Doppler compensation

A satellite signal acquisition and satellite signal technology, applied in the field of satellite navigation, can solve the problems of increasing acquisition time, correlation peak offset, sensitivity decline, etc., and achieve the effects of reducing energy dispersion, balancing acquisition speed, and reducing correlation peak attenuation

Active Publication Date: 2020-11-03
华力智芯(成都)集成电路有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]Therefore, the present invention provides a high dynamic satellite signal acquisition method and system based on code Doppler compensation, which overcomes the problem of increasing acquisition time in the prior art. Defects that lead to correlation peak shifts and decreased sensitivity

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  • High-dynamic satellite signal capturing method and system based on code Doppler compensation
  • High-dynamic satellite signal capturing method and system based on code Doppler compensation
  • High-dynamic satellite signal capturing method and system based on code Doppler compensation

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Embodiment 1

[0056] A high dynamic satellite signal acquisition method based on code Doppler compensation provided by an embodiment of the present invention, such as figure 1 shown, including the following steps:

[0057] Step S1: Obtain the stored data of the satellite signal to be captured, and set the read start address of the data memory to 0. The stored data includes: two baseband signals and spreading codes of the processed satellite signal to be captured stored in the data memory The spreading code signal of the satellite to be captured is stored in the memory.

[0058] In the embodiment of the present invention, such as figure 2 As shown, the satellite intermediate frequency data is converted into two baseband signals I and Q after the complex down-conversion module, and the I and Q signals are respectively passed through a low-pass filter and down-sampled at an N-fold code rate, and stored in the data memory; Generate the spreading code of the satellite to be captured at 1 time...

Embodiment 2

[0092] Embodiments of the present invention provide a high dynamic satellite signal acquisition method based on code Doppler compensation, such as Figure 9 shown, including:

[0093] The data storage module 1 is used to obtain the stored data of the satellite signal to be captured, and the data storage read start address is set to 0, and the stored data includes: two channels of the processed satellite signal to be captured stored in the data storage The baseband signal and the spread spectrum code signal of the satellite to be acquired stored in the spread spectrum code memory; this module executes the method described in step S1 in Embodiment 1, which will not be repeated here.

[0094] The correlation processing module 2 is used to read the stored data by using the parallel correlators of the first preset number, and carry out the correlation integration of the preset integration time and the first preset points, and calculate the processed two-way baseband signal and the ...

Embodiment 3

[0102] An embodiment of the present invention provides a terminal, such as Figure 10 As shown, it includes: at least one processor 401 , such as a CPU (Central Processing Unit, central processing unit), at least one communication interface 403 , memory 404 , and at least one communication bus 402 . Wherein, the communication bus 402 is used to realize connection and communication between these components. Wherein, the communication interface 403 may include a display screen (Display) and a keyboard (Keyboard), and the optional communication interface 403 may also include a standard wired interface and a wireless interface. The memory 404 may be a high-speed RAM memory (Random Access Memory, volatile random access memory), or a non-volatile memory (non-volatile memory), such as at least one disk memory. Optionally, the memory 404 may also be at least one storage device located away from the aforementioned processor 401 . Wherein, the processor 401 may execute the code-Dopple...

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Abstract

The invention discloses a high-dynamic satellite signal capturing method and system based on code Doppler compensation, and the method comprises the steps: sequentially carrying out the correlation integral calculation, buffering processing and frequency spectrum shifting of the storage data of a to-be-captured satellite signal, meeting the requirements of a high-dynamic Doppler frequency coveragerange, reducing the correlation peak attenuation caused by Doppler, and reducing resource consumption of subsequent incoherent accumulation; enabling the frequency spectrum shifted data to enter an FFT module, and calculating an integral value, Doppler frequency and incoherent accumulation times on a preset numerical code phase respectively; utilizing the Doppler frequency, the incoherent accumulation times, the integral value on the preset numerical code phase and the preset integral time to calculate the offset and dislocation incoherent accumulation of the related peaks, thereby reducing the energy dispersion, enhancing the capture sensitivity in the high-dynamic environment, and reducing the average capture time by half. The increase of code phase search times caused by dislocation incoherent accumulation is compensated, and the capture speed, capture sensitivity and resource consumption are balanced.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a high dynamic satellite signal acquisition method and system based on code Doppler compensation. Background technique [0002] In the airborne, missile-borne, and space-borne satellite navigation receiver systems, the high-speed movement of the carrier relative to the navigation satellite will cause three problems: the carrier receiving antenna changes frequently relative to the satellite line-of-sight direction, which causes the instability of the received satellite signal strength; Carrier Doppler causes the attenuation of the correlation peak; excessive code Doppler causes the shift of the correlation peak, resulting in signal energy dispersion. The above problems directly cause the receiving sensitivity of the receiver to drop, and even cannot be used. In order to solve these problems, designers have proposed some corresponding solutions, such as: control the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/26G01S19/25G01S19/30
CPCG01S19/26G01S19/254G01S19/30
Inventor 钟海波陈建国王迎雪刘解华
Owner 华力智芯(成都)集成电路有限公司
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