Coherent Pseudocode Ranging Method Based on msk Spread Spectrum Modulation Mode
A technology of spread spectrum modulation and pseudo-code ranging, which is applied in the field of communication, can solve the problems of prolonging information processing time, increasing the difficulty of signal calculation, increasing hardware costs, etc., and achieving shortened phase adjustment time, strong anti-interference ability, and strong anti-capture effect of ability
Active Publication Date: 2016-08-17
CHENGDU AEROSPACE COMM EQUIP CO LTD
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Problems solved by technology
Pseudo-code ranging is limited by the processing chip sampling rate, chip length, and signal bandwidth. If the sampling rate is increased, the hardware cost will be greatly increased. If the selected spreading code is too long, it will increase the difficulty of signal calculation and prolong the information processing time. If the chip rate is increased, the signal bandwidth needs to be increased. Therefore, in the traditional method, it is impossible to achieve both long-distance and high-precision ranging
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Embodiment
[0041] Embodiment: The coherent pseudo-code ranging method based on MSK (binary frequency shift keying) spread-spectrum modulation mode is implemented in FPGA. After the signal is subjected to MSK spread-spectrum modulation, two rough ranging and one fine ranging are performed. combined to achieve.
[0042] In order to realize the channel multiplexing of ranging frame ranging and information communication, the ranging frame is embedded behind the data frame, and there are protection bits before and after it. Such a framing structure can be used without changing the signal transmission rate, modulation mode, bandwidth, etc. In the case of , the distance measurement is completed. The composition of the ranging frame is as follows figure 1 shown. In the system networking scheme, according to the needs, consider the scheme of truncating the length of the baseband ranging pseudo-code or multiple cycles of the baseband ranging pseudo-code, and can also make a slight modification o...
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The invention discloses a coherent pseudo-code ranging method based on MSK spread-spectrum modulation mode, and relates to the field of communication technology. The method is based on MSK spread-spectrum modulation and demodulation, and embeds the baseband ranging pseudo-code of the signal into the communication information code , ranging at the receiving end, and adopts two coarse ranging and one fine ranging methods to perform ranging in the whole process, and also adopts a new filtering method in the symbol synchronization process. The beneficial effects of the present invention are: without increasing the bandwidth of the communication channel, without changing the original information rate, spread spectrum symbol rate and MSK modulation mode, the ranging frame is embedded in the information frame, and the long-distance and high-precision ranging. Because the system works in the mode of spread spectrum modulation, it has strong anti-interference ability and anti-capture ability. By adopting an improved filtering method in the symbol synchronization method, the problem of excessive phase deviation of the bit synchronization pulse is reduced, and the phase adjustment time is shortened at the same time.
Description
technical field [0001] The invention relates to the technical field of communication, in particular to a coherent pseudo-code ranging method based on MSK spread spectrum modulation mode. Background technique [0002] Traditional radio ranging methods mainly include: pseudo-code ranging, continuous wave ranging, frequency modulation ranging, pulse ranging and multi-tone phase ranging. [0003] Among the traditional ranging methods, the time-of-arrival method is widely used, and the distance is estimated by measuring the delay of the radio wave reaching the antenna. Because the propagation speed of radio waves in the air is constant, as long as the time delay value is obtained, the measurement distance can be obtained. [0004] The ranging system adopts the rangefinder and the transponder. The rangefinder transmits the ranging signal transmitted by the rangefinder through the transmitting channel, space transmission, and the transponder responds. The receiving channel receive...
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IPC IPC(8): H04W64/00H04L27/12
Inventor 折卫东喻娜程皓苏莹余擎阳
Owner CHENGDU AEROSPACE COMM EQUIP CO LTD