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A distance measuring method and system based on css technology
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A distance measurement method and technology, which is applied to radio wave measurement systems, measurement devices, instruments, etc., can solve the problems of increasing resources, power consumption, and insufficient accuracy, and achieve the effect of improving accuracy and high-precision distance measurement
Active Publication Date: 2021-01-26
BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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If the ranging accuracy is required to be no greater than 5m, the accuracy is far from enough
Reducing the duration of a single sampling point can improve accuracy, but this means an increase in the sampling rate, which will greatly increase the required resources and power consumption
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Embodiment 1
[0076] The present invention provides a distance measuring method and system based on CSS technology, the signal processingflow chart is as follows figure 2 shown;
[0077] Specific steps, such as image 3 shown, including:
[0078] S101. Calculate the time synchronization start index in the received signal.
[0079] This application adopts the cross-correlation scheme as the time synchronization scheme, specifically:
[0080] 1) Generate a local signal, which includes two parts: the receiving end generates a local down chirp signal with a modulation value of 0; the receiving end generates a local up chirp signal with a modulation value of 0.
[0081] Different from the up chirp and down chirp signals in the transmit signal, the up chirp and down chirp signals in the transmit signal include noise effects, and the local up chirp signal and local down chirp signal do not include noise, that is, the ideal up chirp and down chirp signal. Since the chirp signal is widely use...
Embodiment 2
[0145] The present application also provides a distance measuring system 200 based on CSS technology, such as Figure 5 shown, including:
[0146] 210. A first calculation module, configured to calculate the time synchronization start index in the received signal, specifically for:
[0147] 1) Generate a local signal, which includes two parts: the receiving end generates a local down chirp signal with a modulation value of 0; the receiving end generates a local up chirp signal with a modulation value of 0.
[0148] Different from the up chirp and down chirp signals in the transmit signal, the up chirp and down chirp signals in the transmit signal include noise effects, and the local up chirp signal and local down chirp signal do not include noise, that is, the ideal up chirp and down chirp signal. Since the chirp signal is widely used, the specific generation method can refer to the principle of linear modulation or radar application, and the present invention will not descr...
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Abstract
The invention provides a distance measurement method and system based on a CSS (ChirpSpread Spectrum). The distance measurement method comprises the steps of calculating a time synchronization starting index in a received signal; preliminarily calculating a frequency synchronization starting index in the received signal; calculating rough frequency offset value and a service signal starting pointindex of the received signal according to the time synchronization starting index and the frequency synchronization starting index; calculating an accurate frequency synchronization starting index byadopting an interpolation fitting method; carrying out ID judgment according to a service signal in a transmitted signal; calculating an accurate service signal starting point index according to thetime synchronization starting index and the accurate frequency synchronization starting index; and calculating an accurate TOA ((Time Of Arrival) measurement value according to the accurate service signal starting point index. By adopting the technical scheme provided by the invention, high-precision distance measurement can be realized in the distance measurement process based on the CSS technology through substantially improving the accuracy of frequency synchronization.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a ranging method and system based on CSS technology. Background technique [0002] Chirpspread spectrum CSS (ChirpSpread Spectrum) is a linear spread spectrum technology used in communication systems. Its characteristics can be summarized as: strong anti-interference and anti-multipath capabilities, low power consumption and delay, long transmission distance and Strong ranging ability. CSS technology can be applied to realize wireless positioning in most complex environments, such as indoor wireless positioning such as smart garages, industrial monitoring and control, and outdoor wireless positioning such as outdoor personnel and network equipment positioning, accident management, and remote patient positioning. [0003] Various ranging schemes based on CSS technology have been proposed in the industry, and the most widely used one is Time of Arrival...
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