Digital heaven and ground wave signal synthesizer

A space-to-ground wave and signal technology, applied in the field of space-to-ground wave signal synthesis device, can solve the problems that affect the signal synthesis effect and difficult noise separation, and achieve the effect of easy separation, strong ability of external interference and noise, and easy parameter modification

Inactive Publication Date: 2008-07-23
HARBIN ENG UNIV
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Problems solved by technology

[0004] The present invention provides a digital sky-ground wave signal synthesis in order to solve the problem that analog components are difficult to separate from the superimposed noi

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  • Digital heaven and ground wave signal synthesizer
  • Digital heaven and ground wave signal synthesizer

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specific Embodiment approach 1

[0012] Specific embodiment one: referring to Fig. 1, Fig. 2, present embodiment is made up of FPGA chip 1, D / A conversion module 9, single-chip microcomputer 10, atomic clock 11 and antenna 12, and FPGA chip 1 provides the reference sine wave signal according to atomic clock 11 will After the internal signal is synthesized, the D / A converter 9 converts the digital signal into an analog signal and sends it through the antenna 12. The single-chip microcomputer 10 controls the signal conversion action of the D / A converter 9 and the on / off of the multi-channel signal of the FPGA chip 1. The FPGA chip 1 can use a Stratix chip, the atomic clock 11 can use a cesium atomic clock, and the D / A converter 9 can use a DAC904E chip;

[0013] The FPGA chip 1 is composed of three sky-wave generating modules 2, three ground-wave generating modules 3, a signal synthesis module 8 and a delay module 13. The three sky-wave generating modules 2 and the three ground-wave generating modules 3 all send...

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Abstract

A digit sky-ground wave signal synthesizer relates to a sky-ground wave signal synthesizer of radio navigation system for resolving the problems of prior art as hard noise separation, noise transmission and amplification along with signal when uses analogue element to realize signal synthesizer to affect signal synthesis effect. The inventive frequency synthesis module according to standard sine signal synthesizes one path of carrier wave clock frequency and one patch of pseudo-code clock frequency, a carrier wave generating module receives the carrier wave clock frequency from the frequency synthesis module, extracts the amplitude of the carrier wave signal, generates and sends the carrier wave signal to a modulation module, a pseudo-code generating module receives the pseudo-code clock frequency from the frequency synthesis module and transmits the generated pseudo-code sequence to the modulation module, a modulation module processes binary addition on the carrier wave signal and pseudo-code sequence according to the carrier wave clock frequency of the frequency synthesis module and transmits the generated modulation signal to the signal synthesis module to process signal synthesis.

Description

technical field [0001] The invention relates to a space-ground wave signal synthesis device of a radio navigation system. Background technique [0002] The radio navigation system works in the medium and short wave range, and the receiving area will generate sky waves at night due to the reflection of the ionosphere. The signal can be reflected to the user receiver through the ionosphere, and the strength of the sky wave signal is much stronger than that of the ground wave signal. interference. Since the propagation path of the sky-wave signal is longer than that of the ground-wave signal, the sky-wave signal reaches the receiver with a delay than the ground-wave signal. According to statistics, the sky-wave signal of a station in the system working area is delayed by about 60-200 μs compared to the ground-wave signal of this station. The signal is about 10-30dB stronger than the ground wave signal. Therefore, when the receiver works at night, it can not only receive the g...

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Application Information

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IPC IPC(8): G01S5/02G01S1/04G01S1/00
Inventor 徐定杰黄平郝燕玲薛冰沈锋韦金辰王伟
Owner HARBIN ENG UNIV
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