High-dynamic high-sensitivity GNSS signal capturing method

A high-sensitivity, signal-acquisition technology, applied in the field of satellite applications, can solve problems such as the reduction of received signal power, achieve the effect of reducing capture time and improving capture efficiency

Active Publication Date: 2020-07-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

For missile-borne vehicles near space, they will be affected by harsh heat, sound, vibration and other complex environments during the whole flight process, and face complex problems in the range of subsonic, transonic, supersonic and hypersonic. The field will also be affected by the attitude adjustment, resulting in a decrease in the received signal power, and it is also necessary to solve the problem of receiving and processing high-sensitivity navigation signals

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Embodiment Construction

[0031] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] The present invention is a high dynamic and high sensitivity GNSS signal acquisition method, the process is as follows figure 1 As shown, for the intermediate frequency analog signal output by the receiver's radio frequency, the intermediate frequency signal data sampling is completed through analog-to-digital conversion (ADC), and then multiplied by the carrier generated by the local NCO to obtain two IQ baseband signals. Then it passes through a low-pass digital filter to limit the signal bandwidth within the main lobe width of the GNSS pseudo-code spectrum to ensure aliasing in the subsequent sampling data extraction process. The low-pass filter can be a FIR low-pass filter. Take GPS L1 C / A code as an example, the filter bandwidth can be 2MHz.

[0033] In order to reduce the amount of processed data, the data after low-pass f...

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Abstract

The invention provides a high-dynamic high-sensitivity GNSS signal capturing method, used for satellite navigation signal capture. After downsampling of sampling data is realized by using an overflowbit of the phase accumulator, through a parallel compensation data folding coherent accumulation method, the signal pseudo code search data volume is further compressed, the processing efficiency andcapture speed are improved, pseudo code Doppler compensation and two-stage adder processing are adopted, and incoherent accumulation of Doppler and pseudo code chip two-dimensional correlation valuesis completed. According to the method, the carrier Doppler change rate is calculated through the flight acceleration of the GNSS receiver, dynamic parallel compensation in folding coherent accumulation is achieved in combination with the carrier Doppler value, and pseudo code Doppler compensation in incoherent processing is achieved through pseudo code Doppler. The GNSS receiver high-dynamic high-sensitivity fast capturing method is suitable for capturing other spread spectrum signals.

Description

Technical field [0001] This application relates to the technical field of satellite applications, and in particular to a method for acquiring high dynamic and high sensitivity GNSS (Global Navigation Satellite System) signals. Background technique [0002] High-dynamic and high-sensitivity GNSS signal acquisition is mainly to realize the rapid acquisition of navigation signals by the GNSS receiver under the conditions of high dynamics and weak received signal power. It is an important link in the high-dynamic and sensitive navigation receiver. [0003] Highly dynamic and highly sensitive navigation receivers can be used in these two types of application scenarios: (1) Whether it is a mid-to-high orbit spacecraft or an airborne aircraft, it has a relatively large flight speed, and frequent orbital maneuvers will occur during the flight. Frequent orbital maneuvers and large air resistance have dynamic stress effects on satellite navigation signal reception; (2) The power of satellite...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/24G01S19/30G01S19/29G01S19/37
CPCG01S19/24G01S19/29G01S19/30G01S19/37
Inventor 王猛陶然郇浩王盾张爽娜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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