BPSK-like Methods for Hybrid-Search Acquisition of Galileo Signals
BPSK-like Methods for Hybrid-Search Acquisition of Galileo Signals
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DOI：
10.1109/icc.2006.255493
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发表时间：
2006-12
期刊：
影响因子：
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通讯作者：
A. Burian;E. Lohan;M. Renfors
中科院分区：
文献类型：
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作者：
A. Burian;E. Lohan;M. Renfors
已经为未来的Galileo和GPS M码信号提出的二进制偏移载波（BOC）调制提供了与BPSK调制信号（诸如GPS C/A码）的更高的频谱分离。BOC信号的自相关函数的绝对值具有较窄的主瓣，这可以增加延迟估计的分辨率，但也呈现深衰落，这可能导致更高数量的定时假设以获取信号。为了消除这些模糊性，文献中已经提出了几种方法，它们提供了一个明确的BPSK形状的相关函数。在本文中，我们分析，比较和开发进一步的两个类似BPSK的方法，允许获得一个BOC信号明确。重点是混合搜索，其中几个时间频率箱并行搜索。我们在这里介绍一个修改后的版本的BPSK样的方法，降低了接收机的复杂性，是有效的奇数和偶数BOC订单。我们分析了单边带（SSB）处理（即，仅使用一个频带）和双边带（DSB）处理（即，上频带和下频带被非相干地组合）。在消除自相关函数模糊性的同时，单边带和双边带处理都存在一定的性能下降，这是由频带选择和非相干处理引起的。分析是在存在多径衰落信道的情况下进行的。作为基准，我们还保留了模糊的BOC处理。我们认为伽利略系统开放服务（OS），分别公开监管服务（PRS）的建议中规定的参数。
The Binary Offset Carrier (BOC) modulation which has been proposed for future Galileo and GPS M-code signals, provides a higher spectral separation from BPSK-modulated signals, such as GPS C/A code. The absolute value of the auto-correlation function of a BOC signal has a narrower main lobe, which may increase the resolution of delay estimates, but also presents deep fades, which may lead to a higher number of timing hypotheses to acquire the signal. In order to get rid of these ambiguities, several approaches have been proposed in literature, which provide an unambiguous BPSK-like shape of correlation function. In this paper we analyze, compare and develop further two BPSK-like methods which allow to acquire a BOC-signal unambiguously. The focus is on hybrid search, where several time-frequency bins are searched in parallel. We introduce here a modified version of a BPSK-like method which decreases the receiver complexity and is valid for both odd and even BOC orders. We analyze both single-side band (SSB) processing (i.e., only one band is used) and dual-side band (DSB) processing (i.e., upper and lower bands are combined non-coherently). While eliminating the ambiguities in auto-correlation function, both SSB and DSB processing present some performance degradation, induced by the band selection and non-coherent processing. The analysis is done in the presence of multipath fading channels. As a benchmark, we keep also the ambiguous BOC processing. We consider parameters specified in the proposals for Galileo system Open Service (OS), respectively Publicly Regulated Service (PRS).