Method for synchronizing radio navigation system with direct sequence spread-spectrum and frequency hopping system
A radio navigation and spread frequency hopping technology, applied in the field of synchronization, can solve the problems of increased synchronization time, easy to be intercepted and cracked, poor confidentiality of direct spread codes, etc., to improve overall efficiency, fast acquisition and stable tracking, and confidentiality guarantee. Effect
Inactive Publication Date: 2010-05-12
HARBIN ENG UNIV
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Problems solved by technology
Shorter direct spread codes can reduce the difficulty and time of capture, but the shorter direct spread codes have poor confidentiality and are easily intercepted and cracked
Using a longer direct spread code, such as a length of more than 8K, can ensure the "three resistance" ability, but also greatly increase the synchronization time
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[0018] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0019] combine figure 1 Describe this embodiment, the radio signal distribution of the radio navigation system of the spread frequency hopping system in this embodiment is from f 1 to f n on the n frequency points of each frequency point, and hop between each frequency point according to a pre-designed frequency hopping sequence; the useful signals on each frequency hopping frequency point are all directly spread signals; the period of the direct spread sequence and the hopping The period of the frequency sequence is the same; the number of frequency hopping frequency points n is a factor of the length N of the entire period of the DS sequence, and m DS chips are distributed on each frequency point, then there is a relationship of N=n×m, that is, the DS signal can be uniform are distributed on each frequency point; although not any series of direct spread sequen...
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The invention provides a method for synchronizing a radio navigation system of a direct sequence spread-spectrum and frequency hopping system, which comprises the steps that: an antenna (1) receives a radio signal and transmits the radio signal to a low-noise amplifier (2); the low-noise amplifier (2) performs low-noise amplification on the signal and transmits the amplified signal to a radio frequency processing module (3), the radio frequency processing module (3) performs filtering and automatic gain control (AGC) on the signal and then transmits the processed signal to a direct sequence spread-spectrum and frequency hopping synchronizing module (4); the direct sequence spread-spectrum and frequency hopping synchronizing module (4) realizes the synchronization of a frequency hopping sequence and a direct sequence spread-spectrum sequence; and a subsequent processing module (5) performs subsequent operations which are observed vector extraction, information demodulation and position resolution respectively according to synchronization information provided by the direct sequence spread-spectrum and frequency hopping module (4). The method effectively improves performance of capturing and tracking direct sequence spread-spectrum and frequency hopping signals, can quickly capture and stably track the direct sequence spread-spectrum sequence and the frequency hopping sequence which are relatively longer, and compared with the conventional method for synchronizing frequency hopping first and then synchronizing direct sequence spread-spectrum, is higher in synchronization speed, higher in synchronization accuracy and more ensured in privacy.
Description
(1) Technical field [0001] The present invention relates to a radio navigation technology of the spread frequency hopping system, in particular to a synchronization method applied in the radio navigation system of the spread frequency hopping system. (2) Background technology [0002] Radio navigation can quickly and reliably provide users with accurate navigation and positioning information, and plays an important role in navigation, aviation and ground transportation. However, the increasingly harsh electromagnetic environment of the surrounding battlefield and the deliberate "navigation warfare" attacks of powerful military enemies have put forward stricter requirements on the overall effectiveness of the new generation of radio navigation systems. Focusing on the protection of navigation and positioning rights in the context of actual combat, highlighting the "three defenses", namely anti-jamming, anti-interception and anti-destruction as the core, has become a key indic...
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IPC IPC(8): G01S1/02
Inventor 徐定杰赵彦雷沈锋吴述敏薛冰
Owner HARBIN ENG UNIV
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