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首页> 外文会议>Proceedings of the national technical meeting : "Vision 2010: Present and future" >Time Tracking Performance of GPS Type NRZ Direct Sequence Signals in the Presence of GPS Modernization Signals
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Time Tracking Performance of GPS Type NRZ Direct Sequence Signals in the Presence of GPS Modernization Signals

机译：在GPS现代化信号存在下GPS类型NRZ直接序列信号的时间跟踪性能。

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A planned update of the block IIF GPS satellites includes the addition of wideband higher power military signals. This IOC considers the effects of multiple GPS signals interfering with the reception of the P code, along with the receiver thermal noise, as measured by the error in the P code tracking loop. The multiple interferers are modeled as a Gaussian random process with the same spectral density as the interfering signals. An assumption of the analysis is one P code signal is tracked, and is corrupted by a number of interfering signals (thatrnwould typically be in view) of one modulation type and thermal noise. The types of interfering signals that are considered in this IOC include either a P code or various types of split spectrum or binary offset carrier (BOC) signals, along with the usual receiver thermal noise. All the interfering signals are assumed to have long codes so that a random chip stream model is adequate.rnThe code tracking loop chosen for analysis is a noncoherent I-Q baseband code loop with an early late time difference of one chip. The integration is over one bit time. The results contained in this IOC assume that the early late separation is one P code chip (d = 1 chip). The main result of this IOC establishes that for this code tracking loop type the effect of the interference is to add the one sided despread interference spectral density to the one sided noise spectral density at f = 0. A result of this analysis is that there is no frequency weighting of f2 (such as found in a coherent code tracking loop using an ideal differentiator) for the effective noise spectral density, and that all the binary offset codes considered here yield less interference than that from P code to P code.
机译：IIF GPS块状卫星的计划更新包括增加宽带高功率军事信号。此IOC考虑了多个GPS信号干扰P代码接收以及接收器热噪声的影响，该影响由P代码跟踪环路中的误差来衡量。多个干扰源被建模为具有与干扰信号相同的频谱密度的高斯随机过程。分析的一个假设是跟踪一个P码信号，并被一种调制类型和热噪声的许多干扰信号（通常认为是干扰）破坏。在此IOC中考虑的干扰信号类型包括P码或各种类型的分裂频谱或二进制偏移载波（BOC）信号，以及通常的接收机热噪声。假定所有干扰信号均具有长码，因此随机码片流模型就足够了。用于分析的码跟踪环是一个非相干的I-Q基带码环，其时差较早。集成时间超过了一位。该IOC中包含的结果假定，早期分离是一个P码片（d = 1片）。该IOC的主要结果表明，对于这种代码跟踪循环类型，干扰的影响是在f = 0时将单侧解扩干扰频谱密度加到单侧噪声频谱密度上。该分析的结果是存在对于有效噪声频谱密度，没有f2的频率加权（例如在使用理想微分器的相干代码跟踪环路中找到），并且这里考虑的所有二进制偏移代码产生的干扰都比P代码到P代码的干扰小。

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