Method and device for processing navigation signals
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A technology of navigation signal and processing method, applied in the field of satellite navigation
Active Publication Date: 2015-12-30
BEIJING BDSTAR NAVIGATION CO LTD
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[0004] The adaptive weight obtained by the conventional space-time adaptive anti-jamming method can only make the antenna receiving pattern form a narrow null in the direction of arrival of the jamming signal
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Embodiment 1
[0052] Embodiment 1, a navigation receiver anti-multipath method based on minimum variance, comprising:
[0053] S101. Obtain M channels of input signals with a length of L according to the received M channels of radio frequency signals, where M and L are positive integers;
[0054] In this step, the radio frequency signals are respectively received by M uniform linear array elements, and M channels of intermediate frequency sampling signals are obtained through AD (analog-to-digital converter) acquisition as input signals, which are respectively x 1 (z), x 2 (z), x 3 (z), ... x M (z), z is the serial number of sampling points in the signal (that is, the time point corresponding to each sampling point), which is a positive integer; the intermediate frequency sampling signal includes satellite signals, interference and background noise.
[0055] It is also possible to further down-convert and low-pass filter the M channels of intermediate frequency sampling signals, and use ...
Embodiment 2
[0110] Embodiment 2. A navigation signal processing device, such as figure 2 shown, including:
[0111] The receiving module is used to obtain M-channel length-L input signals according to the received M-channel radio frequency signals, and M and L are positive integers;
[0112] A space-time filter is used to perform an N-order delay on the input signals of each channel to obtain M×N input signals with a length of L, and N is the number of delays in the time domain;
[0113] Space-oriented vector calculation module, used to calculate space-oriented vector S s :
[0114] S s = [ 1 , e jω s , . . . , e j ( ...
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Abstract
The invention provides a navigation information processing method and a navigation information processing apparatus. The method comprises the steps of implementing N-order delaying on various paths of input signals which are obtained according to M paths of received radio-frequency signals and are L long, so as to form M*N input signals which are L long; respectively calculating a space navigation vector Ss and a time navigation vector St, and calculating a navigation vector of a useful signal according to the space navigation vector Ss and the time navigation vector St; calculating a constraint matrix and a related matrix; and finally, calculating a space-time filter weight coefficient matrix, multiplying each element in the calculated space-time filter weight coefficient matrix by one corresponding signal in the M*N input signals which are L long, and adding products to obtain an output signal. The invention can realize narrow nulling of an antenna reception directional diagram in a direction where an interference signal arrives, and simultaneously can adaptively form nulling in a multi-path direction of the useful signal reflected from the ground.
Description
technical field [0001] The invention relates to the field of satellite navigation, in particular to a navigation signal processing method and device. Background technique [0002] Global satellite navigation systems currently include the American Global Positioning System GPS, the Russian Global Satellite Navigation System GLONASS, the European Galileo satellite positioning system Galileo, and the developing Chinese Beidou positioning system. They can provide all-weather, real-time, continuous high-precision location information, and have It is widely used in positioning, navigation, timing and precision measurement of various military and civilian targets. [0003] The electromagnetic environment in satellite navigation is complex, and there are man-made interferences with various patterns and time-varying statistical characteristics, especially the narrow-band and broadband interference with high power density has become one of the most important factors to damage the navi...
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