A hop-spread code phase tracking method suitable for narrowband interference
A narrow-band interference and code phase technology, which is applied in the field of signal phase tracking, can solve the problems of tracking result deviation and measurement result deviation, and achieve the effect of ensuring accuracy and excellent anti-interference performance
Active Publication Date: 2018-03-09
XIAN INSTITUE OF SPACE RADIO TECH
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However, the correlation peak of the DS / FH mixed spread spectrum signal will change from a single peak to a triple peak with the increase of the interference power under narrow-band interference conditions, which will cause deviations in the tracking results of the traditional code phase tracking loop, and finally cause the measurement results to appear deviation
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[0022] The working principle of the present invention will be further explained below in conjunction with the accompanying drawings.
[0023] Such as figure 1 Shown, be the schematic diagram of the inventive method, main steps are as follows:
[0024] (1) Utilize the local reference clock to generate local frequency hopping codewords and local spread spectrum codewords required for dehopping and despreading the received hopping spread signal;
[0025] (2) Utilize the local frequency hopping codeword to obtain the local frequency hopping carrier and de-hop the received hopping spread signal;
[0026] On the one hand, the local frequency hopping signal is synthesized according to the input frequency hopping code word, and the DS / FH mixed spread spectrum signal is dehopped; phase correction. The principle of phase rotation correction frequency hopping phase is derived as follows. The jump-spread signal can be expressed as:
[0027] f(t)=d(t)c(t)exp(j2πf i t+θ), iT hop ≤tho...
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The invention discloses a frequency hopping spreading code phase tracking method suitable for narrowband interference. The method comprises the following steps: generating a local frequency hopping code word and a local spreading code word; de-hopping received frequency hopping spreading signals; performing low-pass filtering and draw-off on the de-hopped signals to obtain data with a reduced rate; carrying out digital automatic gain control on the data with the reduced rate to obtain data with basically constant amplitude; performing rotation amount control, i.e., controlling the rotation amount of phase rotation; performing the phase rotation on the data with the basically constant amplitude; performing de-spreading on the data after the phase rotation; accumulating the data after the de-spreading, and finding an accumulative mode maximum value and a corresponding phase rotation amount; and performing phase adjustment amount accumulation, i.e., accumulating all phase adjustment amounts, and performing division on an accumulation result and a clock period of a local reference clock to obtain a quotient and a remainder value, for performing overall reference clock period adjustment on a local frequency hopping spreading code phase and performing adjustment within one reference clock period on the local frequency hopping spreading code phase according to the remainder value.
Description
technical field [0001] The invention belongs to the communication field and relates to a signal phase tracking method of a DS / FH hybrid spread spectrum system. Background technique [0002] Hopping code phase tracking is a key technology of DS / FH (direct sequence / frequency hopping, direct sequence / frequency hopping) hybrid spread spectrum system, and its performance directly determines the performance of the hybrid spread spectrum system under narrowband interference conditions. The tracking capability also determines the measurement capability of the hybrid spread spectrum system under narrowband interference conditions. [0003] Traditional code phase tracking generally uses a lead-lag tracking loop. However, the correlation peak of the DS / FH mixed spread spectrum signal will change from a single peak to a triple peak with the increase of the interference power under narrow-band interference conditions, which will cause deviations in the tracking results of the traditiona...
Claims
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IPC IPC(8): H04B1/707H04B1/71H04B1/713H04B1/7075H04B1/7156
CPCH04B1/707H04B1/7075H04B1/71H04B1/713H04B2001/71566
Inventor 秦玉峰段鹏辉张宗攀杨立明韩小娟
Owner XIAN INSTITUE OF SPACE RADIO TECH