A Weak Signal Acquisition Method and Device Based on Differential Coherent Accumulation
A weak signal acquisition and coherent accumulation technology, applied in the field of signal acquisition, can solve the problems of reducing the signal-to-noise ratio of the signal, and the poor signal acquisition performance of the positioning receiver, so as to achieve the effect of improving the signal-to-noise ratio and improving the acquisition performance.
Active Publication Date: 2019-08-02
北京度位科技有限公司
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[0006] It can be seen that although the differential coherent accumulation algorithm does not introduce serious square loss like incoherent accumulation, there is a noise and signal cross term Z SN and the noise product term Z N , which reduces the signal-to-noise ratio of the signal, resulting in poor capture performance of the positioning receiver for weak signals
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[0058] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0059] In order to improve the weak signal acquisition performance of the positioning receiver, the embodiment of the present invention provides a weak signal acquisition method and device based on differential coherent accumulation.
[0060] A weak signal acquisition method based on differential coherent accumulation provided by an embodiment of the present invention will be firstly introduced below.
[0061] Such as figure 2 As shown, the embodiment of the...
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The embodiment of the invention provides a weak signal capturing method based on differential coherence accumulation and a device. The method comprises steps of acquiring a weak signal; according to a local spreading code sequence, carrying out differential coherence accumulation calculation on the target weak signal to acquire a first power sequence; according to the first power sequence, estimating noise power; according to the estimated noise power, carrying out loss compensation on elements in the first power sequence to acquire a second power sequence, wherein elements in the second power sequence are elements subjected to loss compensation; and finally, carrying out judgment processing on the second power sequence and determining whether the target weak signal has been successfully captured. According to the scheme provided by the embodiment, weak signal capturing is performed, so capturing performance of weak signals by a positioning receiving machine can be improved.
Description
technical field [0001] The present invention relates to the technical field of signal capture, in particular to a method and device for capturing weak signals based on differential coherent accumulation. Background technique [0002] At present, GNSS (Global Navigation Satellite System, Global Navigation Satellite System) provides reliable location services for people's outdoor activities, but with the development of cities, the proportion of people's indoor activities is increasing. More than 100% of the activity time is indoors", therefore, it is of great practical significance to study a reliable indoor positioning system. TC-OFDM (Time&Code Division-Orthogonal Frequency Division Multiplexing, based on time-division CDMA-OFDM superimposed signal system) is developed for the precise positioning of indoor environments. It uses CDMA (Code Division Multiple Access, Code Division Multiple Access) technology to The positioning signal is superimposed on the mobile broadcast sig...
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IPC IPC(8): G01S19/24
CPCG01S19/246
Inventor 邓中亮刘志超莫君贾步云肖占蒙李三川
Owner 北京度位科技有限公司