A stepwise weighted tong detection method
A detection method and step value technology, applied in the field of communication, can solve the problems of the fluctuation of navigation signal energy, the inability to adapt to the application of changing scenarios, and the difficulty in taking into account the performance, etc., so as to improve the weak signal detection performance and improve the weak signal detection performance. , the effect of increasing the number of detection confirmations
Active Publication Date: 2021-09-24
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI +1
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Problems solved by technology
[0004] However, the receiver moves with the user in complex scenarios, resulting in fluctuations in the energy of available navigation signals
The parameters of the traditional Tong detector are fixed. In the face of complex scene signal detection and judgment, it is necessary to face the trade-off between detection performance and detection time. It is difficult to balance the efficiency in the strong signal detection state and the performance in the weak signal detection state. Change scene application
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[0018] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0019] The invention provides a step-weighted Tong detection method. According to the difference between the signal-to-noise ratio of the signal to be detected and the threshold value, the step value of the detector is adaptively adjusted in real time, and the detection mode is optimized to adapt to signal detection and judgment in complex scenes.
[0020] The principle structure diagram and flow chart of the weighted step-tong detection method involved in the present invention are shown in figure 1 and figure 2 . The details are as follows:
[0021] Step 1, performing carrier stripping and pseudocode stripping on the received signal to obtain the energy envelope of the received signal;
[0022] After the receiver performs down-conversion, A / D sampling, despreading, demodulation, coherent integration and zero clearing on the signal received by the ante...
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The invention discloses a stepwise weighted Tong detection method. By using the invention, the signal quality (signal-to-noise ratio) can be dynamically weighted and adjusted to the Tong detector step value, taking into account algorithm performance and efficiency, and can be applied to complex and changeable scenes. The Tong detector of the present invention can adaptively adjust the step value of the counter according to the size of the signal energy envelope, and the real-time feedback counter performs accumulation or rollback operations, which can be flexible according to the scene or signal state without changing the parameters of the Tong detector Adjustment can optimize the working mode of the detector without increasing the amount of calculation; in the case of a large difference between the signal and the noise, increase the step weight, effectively shorten the detection dwell time, and improve the detection efficiency; for weak signals that are difficult to detect, you can use Weak difference weighting reduces the step weight of the detector, increases the number of detection confirmations, improves weak signal detection performance, and improves signal detection accuracy and reliability.
Description
technical field [0001] The invention belongs to the technical field of communication, relates to a satellite navigation signal synchronous reception technology, in particular to a fast and high-performance step-weighted Tong detection method for navigation signals. Background technique [0002] As the interface device between the Global Navigation Satellite System (GNSS) and the user end, the navigation receiver mainly completes user positioning, navigation and timing functions. The receiver design first implements signal capture, integrates / clears each unit in the two-dimensional space of time domain and frequency domain, and performs judgment detection based on energy packets to determine whether the desired signal exists and the signal parameters (Doppler frequency shift and pseudo-random code phase) rough estimate. [0003] In order to ensure the accuracy and reliability of detection and estimation in the capture link, multiple dwell detection algorithms are usually use...
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IPC IPC(8): H04B17/336H04B17/20
CPCH04B17/20H04B17/336
Inventor 罗瑞丹徐颖袁洪唐阳阳袁超
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI