A satellite navigation signal generation method based on chip-level pulse time hopping
A satellite navigation signal, chip-level technology, applied in the field of satellite navigation, can solve the problems of changing signals, incompatibility of satellite navigation signals, incompatibility of satellite navigation signals of frequency hopping system signals, etc., to achieve flexible adjustment, achieve anti-interference ability, Improve the effect of anti-interference ability
Active Publication Date: 2021-12-07
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology
However, direct spread frequency hopping has two shortcomings. First, the frequency hopping system signal is not compatible with existing satellite navigation signals. Second, there are still certain problems in the high-precision measurement of the carrier phase of the FM signal.
The traditional direct spread time-hopping signal is not compatible with the current satellite navigation signal and cannot be directly received by the existing receiving method
When dividing a chip into multiple time slots, the power spectrum of the signal will be changed, and the signal bandwidth will become larger.
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[0056] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0057] The average power of the transmitted signal is fixed. In order to improve the anti-interference ability of the signal, the present invention adopts a chip-level pulse time hopping scheme, that is, the spreading code sequence is grouped by chips, and each group has N chips, and only A chip gate, the position of the gate chip is determined by a gate pulse, and the gate pulse can be generated by a time-hopping code, which is pseudo-random. In the scheme of the present invention, the power of the original N chips is concentrated on one chip, and for users without time-hopping codes, the traditional navigation signal receiving and processing method can be adopted, so the present invention is compatible with existing satellite navigation signals; For users with time-hopping codes, after matching reception, it is equivalent to increasing the ...
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The invention relates to a satellite navigation signal generation method based on chip-level pulse hopping, including baseband spread spectrum modulation; a signal pseudo-code generator generates a signal pseudo-code, performs chip shaping, and modulates together with encoded text , to obtain the baseband spread spectrum signal; chip time hopping modulation; the frequency hopping pseudocode generator generates the frequency hopping pseudocode sequence, controls the chip gate pulse generator, generates the chip gate pulse, and performs the process with the baseband spread spectrum signal Chip time-hopping modulation to obtain a chip time-hopping signal; radio frequency modulation; the carrier generator generates a radio frequency carrier, and performs radio frequency modulation with the chip time-hopping signal to generate a radio frequency signal, which is amplified and filtered to complete chip-based Generation of satellite navigation signals with pulse hopping, and broadcast to users through antennas. The invention improves the anti-jamming capability, maintains compatibility with the existing satellite navigation signal system, and supports high-precision applications based on carrier phase measurement.
Description
technical field [0001] The invention belongs to the field of satellite navigation, in particular to a method for generating satellite navigation signals based on chip-level pulse time hopping. Background technique [0002] The current satellite navigation signals are susceptible to interference and occlusion, mainly because the navigation satellite is a power-limited system, and the average transmission power of the signal is limited. The satellite navigation signal mainly adopts the continuous broadcast signal of direct sequence spread spectrum modulation, and the ground level of the satellite navigation signal is low, generally around -160dBW. Moreover, the frequency and modulation method of satellite navigation signals are public, and are particularly susceptible to interference from matching spectrum. [0003] In order to improve the anti-interference ability of the signal, the most effective and direct method is to increase the transmission power of the signal. For thi...
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IPC IPC(8): G01S19/02
CPCG01S19/02
Inventor蒙艳松严涛王瑛周昀雷文英王国永边朗
OwnerXIAN INSTITUE OF SPACE RADIO TECH