9 results about "Signal strength" patented technology

The invention relates to a CSI based omnidirectional detection method suitable for the indoor environment. A traditional WiFi based indoor personnel detection scheme tends to use RSSI (Received Signal Strength Indicator) information, and common commercial AP and WiFi terminals can measure the RSSI information conveniently but have defects including large granularity and low time stability. According to the method of the invention, CSI replaces RSSI information, advantages including high time stability, high resistance to dynamic environment interference and high sensitivity to link around staff of the CSI are utilized, a power control machine based on a network interface card of the Intel 5300 series is used in the indoor environment, a fingerprint matching method is used, and indoor omnidirectional passive personnel sensing is realized. The method of the invention can be used to improve the personnel detection accuracy in the indoor environment and realize omnidirectional personnel detection in the indoor environment.

A method switching download, a control method thereof and a control system thereof are provided. The terminal simultaneously connects to the LTE and WIFI networks, and the terminal dynamically detects the WIFI signal strength in a real-time manner and reports it to the Small Cell. When the WIFI signal strength is greater than the threshold value, the Small Cell automatically uses the WIFI network to download the file. When the WIFI signal strength is less than the threshold value, the Small Cell automatically uses the LTE network to download the file.

The invention relates to the technical field of communication positioning and navigation, and in particular to a Matrix Recovery based Radio Map construction method in a WLAN indoor positioning system, which aims to solve a problem that Radio Map constructed at an off-line stage in the existing indoor positioning method is incomplete with noise jamming. The Matrix Recovery based Radio Map construction method in the WLAN indoor positioning system comprises the following steps: (1), selecting suitable origins of coordinates to establish a two-dimensional rectangular coordinate system; (2), recording space position data of each reference point and corresponding received signal strength (RSS) signal space data to complete establishment of a Radio Map database; (3), filling; (4), recovering; and (5), drawing a CDF curve. The Matrix Recovery based Radio Map construction method in the WLAN indoor positioning system is applied to the technical field of communication positioning and navigation.

Intent-based reminders are provided. A user (102) is enabled to initiate a reminder request based on an intent to enter or leave a given location. In a geofence training process, a plurality of geofences (122) are created for plotting a path (120) and subsequently tracking the user's traversal of the path for inferring the user's intent to depart or enter the location. A signal strength of a WLAN(126) is recorded at each geofence. As the user traverses the path, a determination is made as to whether a predetermined percentage of the geofences is triggered in a sequential order by comparing the signal strength of the WLAN against the recorded WLAN signal strengths at the geofences. In some examples, signal strengths of neighboring WLANs are recorded and used to filter out false triggers. When a determination is made that the user's intent is to depart or enter the location, a reminder (106) is provided.

The invention discloses a high gain computer network signal amplifier. A structure thereof comprises a master machine body, an upper machine body, output connection ports, output working state displaylamps, a power button, a fixing holder, a fixing screw-socket, a lower machine body, a reset button, an input connection port and a power connection port. The upper machine body is set at the upper part of the master machine body. The output connection ports are set below the output connection ports. The power button is set at the left side of the output working state display lamps. The lower side of the upper machine body is connected with the lower machine body. The amplifier is equipped with an anti-interference device, the condition that the signal quality is reduced due to the mutual interference before the signals are output can be effectively prevented, the output signal strength and quality can be effectively improved, and the device use security and stability can be improved.

The invention relates to the technical field of wireless positioning, in particular to an RSSI (Received Signal Strength Indicator) fingerprint-based indoor positioning method, which comprises the following steps of: S1, when detecting that equipment to be positioned generates a positioning signal, respectively acquiring the signal receiving strength of each positioning gateway; s2, generating a global posterior probability of each fingerprint point according to the signal receiving strength and the prior probability; and S3, outputting a positioning result according to the global posterior probability and the position coordinates of the fingerprint points, generating a new prior probability corresponding to each fingerprint point according to the positioning result and the global posterior probability, and then returning to S1. The method has the beneficial effects that the next prior probability for the same to-be-positioned device is generated by introducing the positioning result in the continuous positioning process, so that the fusion of historical data in the continuous positioning process is realized, the previous positioning is associated with the current positioning, and the positioning accuracy is improved. The coordinate jumping phenomenon caused by the independent positioning process in the prior art is reduced, and the continuity of the positioning track and the positioning stability are improved.