Device and method for rapidly detecting feeble signals
A weak signal and fast technology, applied in the direction of measuring devices, radio wave measurement systems, beacon systems using radio waves, etc., can solve the problems of decreased search speed, high signal-to-noise ratio requirements, and difficult serial detection, etc. Reach the effect of reducing the hardware area, reducing the number of channels, and optimizing the multi-resident detector
Inactive Publication Date: 2010-11-10
中科星导(北京)半导体有限责任公司
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The increase of false alarm probability will reduce the search speed
The second disadvantage is that only one maximum detection signal is output from a large number of detection results each time, which requires a high signal-to-noise ratio. In a weak signal environment, the signal-to-noise ratio can only be improved by increasing the integration time, which also increases TTFF
[0006] It can be seen that the current popular parallel capture method is difficult to achieve the advantages of serial detection because it has to treat all search results in the parallel architecture equally.
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[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0045] The invention relates to the field of global satellite positioning and navigation, such as the GPS system, and aims to quickly detect weak signals by utilizing the advantages of a parallel search engine and a multi-channel serial detection correlator. GNSS signal detection belongs to the field of weak signal detection, and the system bit error rate is required to be 1×10 -6 Above, multi-residency detectors are generally used to meet the requirements of the bit error rate. The essence is to use multiple independent dwell processes to reduce the bit error rate, and the bit error rate corresponds to the detection probability and the false alarm probability. , under the requirements of the Neyman-Pearson criterion, the...
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The invention discloses a device and a method for rapidly detecting feeble signals. The device comprises a parallel search engine, a detection correlator, a tracking correlator and an internal bus, wherein the parallel search engine is used for searching carrier Doppler frequency points and PN (Performance Number) code phase parameters of GPS satellite launching signals in a visual field in parallel and allocating the searched carrier Doppler frequency points and the PN code phase parameters to the detection correlator through the internal bus under the control of an embedded microprocessor; the detection correlator is used for detecting search results coming from the parallel search engine in parallel, if the detection is successful, the successfully detected code phase parameters and Doppler frequency points are allocated to the tracking correlator through the internal bus under the control of the embedded microprocessor; the tracking correlator is used for dynamically tracking a satellite and is synchronous with the satellite to calculate the launching time of the satellite and simultaneously demodulate a navigation message for positioning; and the internal bus is used for uniformly dispatching data carrying work of each part. By utilizing the invention, the rapid detection on the GNSS (Global Navigation Satellite System) signals is realized.
Description
technical field [0001] The invention relates to the technical field of signal detection of a global satellite positioning system receiver, in particular to a device and method for quickly detecting weak signals. Background technique [0002] Global satellite positioning and navigation systems, such as the Standard Positioning Service (SPS) of the Global Positioning System (GPS), are provided free of charge to all users around the world, and have been widely used at present. The E911 specification issued by the US Federal Communications Commission (FCC) requires that the user's location can be tracked through mobile phone information at any time and any place, and location information can be provided for all "911" call emergency services. Europe has also implemented similar E112 emergency services. my country is also formulating standards for satellite navigation receivers in order to provide users with better quality positioning services. GPS has been widely used in vehicl...
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IPC IPC(8): G01S1/02G01S5/02
Inventor 杨涛阎跃鹏李金海
Owner 中科星导(北京)半导体有限责任公司