Capturing method of satellite navigation signal in adjustable carrier wave doppler frequency searching range

A satellite navigation signal and frequency search technology, which is applied in the field of satellite navigation signal acquisition with adjustable carrier Doppler uncertainty, can solve problems affecting receiver performance, shorten the time for first positioning, reduce search time, and improve performance Effect

Inactive Publication Date: 2013-07-17
BEIJING MXTRONICS CORP +1
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AI Technical Summary

Problems solved by technology

However, according to the orbital velocity of the satellite, taking the maximum value in the horizontal direction, the maximum satellite velocity obtained is about 950m / s. Considering the stationary receiver, the Doppler frequency variation range caused by the satellite movement is -5-5kHz, so for any Satellites, the carrier NCO frequency of the static receiver needs to traverse -5-5kHz, resulting in a small number of satellites captured by the receiver within a certain period of time, which affects the performance of the receiver

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  • Capturing method of satellite navigation signal in adjustable carrier wave doppler frequency searching range
  • Capturing method of satellite navigation signal in adjustable carrier wave doppler frequency searching range

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Embodiment Construction

[0020] Such as figure 1 As shown, the receiver used in the present invention includes a carrier NCO generator 101, a controller 102, a baseband CPU 103, a frequency hopping information memory 104, a code search module 105, and a capture confirmation module 107.

[0021] First, the controller 102 reads the GPS signal carrier local oscillator frequency control word from the baseband CPU 103, and generates two orthogonal local carrier signals of corresponding frequencies from the carrier NCO to realize the de-carrier operation of the received signal. In the above process, the controller 102 will also cooperate with the frequency hopping information memory 104 to set the initial carrier Doppler coverage according to the actual situation of the receiver.

[0022] After the carrier removal operation is completed, the signal enters the code search module 105 for code phase search, and code acquisition methods such as traditional time-domain serial correlation or frequency-domain parallel c...

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Abstract

The invention relates to a capturing method of a satellite navigation signal in an adjustable carrier wave doppler frequency searching range. The method comprises the following steps that: an initial carrier wave doppler covering range and a corresponded carrier frequency is generated; code phase searching is completed under the carrier wave frequency to obtain a corresponded capturing result; because the covering of the initial carrier wave doppler is complete, search frequency point information of the carrier wave doppler that is frequency hopping information is written into a frequency hopping information memory to complete storage of the frequency hopping information that can be used for subsequent continuous capturing; and other unresearched satellites are switched for continuous execution. According to the invention, searching of an undetermined range of a carrier wave frequency can be completed at the expense of few hardware costs and a fast speed; satellites can be searched ina short time as much as possible; and first positioning time of a receiver is improved.

Description

Technical field [0001] The invention belongs to the technical field of satellite signal acquisition in the process of satellite navigation and positioning, and relates to a satellite navigation signal acquisition method with adjustable carrier Doppler uncertainty. Background technique [0002] The current satellite navigation signal acquisition technology mainly involves time domain and frequency domain acquisition, and is divided into matched filtering, FFT / IFFT, and time-domain serial correlation in terms of implementation methods. According to different applications, the acquisition strategy of baseband processing corresponds to different hardware scales. At present, time-domain serial acquisition or frequency-domain code phase parallel acquisition methods are usually used, that is, the way of traversing the frequency of carrier NCO is used to realize the correspondence to all carrier Doppler uncertain ranges. But according to the satellite orbital speed, take the maximum val...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/29
Inventor 寇巍郑永智
Owner BEIJING MXTRONICS CORP
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