Abstract: The present invention discloses an urban traffic velocity estimation method based on multi-source crowd sensing data. This method, based on roadside pedestrian data and road navigation data collected by smart phones, obtains a final estimated velocity through the steps of missing data filling, self-view velocity aggregation and multi-view velocity fusion. This fine-grained large-scale urban traffic velocity estimation method can achieve velocity estimation on all types of roads, including suburban road sections and paths, instead of just focusing on main roads in a city center. According to the present invention, based on data driving, the urban traffic velocity estimation method does not need to install additional devices on roads, and is low in cost and high in universality. Compared with the prior art, the urban traffic velocity estimation method has higher practicability, theoretical property and applicability, and is of great significance for improving traffic management and planning.

Abstract: The present invention discloses a human mobility prediction method based on a generative adversarial network. According to the method, the integration of spatio-temporal features of multimodal data is studied by virtue of studying urban human mobility prediction during the pandemic. A human mobility mode is difficult to be predicted during the pandemic due to complex multimodal data such as complicated social background, policy and pandemic situation. The analysis of human mobility data from three cities in China shows that different cities have highly similar human mobility modes during the pandemic, despite of great differences between them. On this basis, the disclosure designs a prediction model, in which the effects of the multimodal data on the spatio-temporal features of the human mobility are modeled integrally. In addition to this, the model can help the government evaluate the potential effects of different policies on human mobility better, and optimize policy development.

Abstract: Disclosed in the present invention is a contact tracing pre-screening method for infectious disease susceptible people based on WiFi matching. In the method, based on WiFi connection records of a user and a list of anonymous identification codes of confirmed users collected by a mobile device, a judgment on whether a user has an infection risk is given through the steps of record matching, information compression, dangerous WiFi database construction, coincidence rate calculation between the user and a dangerous WiFi, etc. Data required by this method is easy to be obtained for general smart mobile devices, and no special application program is required. Compared with traditional contact tracing methods based on GPS and Bluetooth, this method provides another dimension of information without using an additional device and sensitive data, has higher operating efficiency, and can help to carry out contact tracing more comprehensively and efficiently.

Abstract: Disclosed in the present invention is a contact tracing pre-screening method for infectious disease susceptible people based on WiFi matching. In the method, based on WiFi connection records of a user and a list of anonymous identification codes of confirmed users collected by a mobile device, a judgment on whether a user has an infection risk is given through the steps of record matching, information compression, dangerous WiFi database construction, coincidence rate calculation between the user and a dangerous WiFi, etc. Data required by this method is easy to be obtained for general smart mobile devices, and no special application program is required. Compared with traditional contact tracing methods based on GPS and Bluetooth, this method provides another dimension of information without using an additional device and sensitive data, has higher operating efficiency, and can help to carry out contact tracing more comprehensively and efficiently.

Abstract: Disclosed is a slot-type ultra-wideband depolarized chipless RFID tag. The tag comprises a tag slot unit, a metal plate and a dielectric substrate, wherein the tag slot unit is formed by means of etching the metal plate, and is located on the upper surface of the dielectric substrate; the tag slot unit is composed of at least four annular slot groups, and tags are distributed in a centrosymmetric manner; and each annular slot group is composed of four concentric annular slots that are distributed in a nested manner; a transceiver antenna TX transmits a horizontally polarized electromagnetic wave; a scattered wave obtained; a transceiver acquires a frequency spectrum of the scattered wave; the spectrum is converted into a time-domain signal; a response of the tag is extracted; and an MFCC feature of the time-domain signal is extracted.

Abstract: Discloses a combined ultra-wideband cross-polarized chipless RFID tag based on MFCC feature coding, which comprises a tag patch unit, a dielectric substrate and a grounding layer, wherein the tag patch unit comprises a barcode-type resonant unit and a double L-type resonant unit; the barcode-type resonant unit consists of five identical rectangular patches arranged in parallel and rotated counterclockwise; the double L-type resonant unit is formed by reversely combining two L-type patches composed of four identical rectangular patches; a transmitting antenna transmits horizontally polarized electromagnetic waves as interrogation signals, the scattered waves reflected by the tag are acquired by a receiving antenna, a receiver acquires the spectrum of the scattered waves to convert the spectrum into time domain signals by inverse Fourier transform, the response of the tag is extracted through a window, and MFCC features are extracted by pre-emphasis and short-time Fourier transform.

Abstract: Disclosed is a slot-type ultra-wideband depolarized chipless RFID tag. The tag comprises a tag slot unit, a metal plate and a dielectric substrate, wherein the tag slot unit is formed by means of etching the metal plate, and is located on the upper surface of the dielectric substrate; the tag slot unit is composed of at least four annular slot groups, and tags are distributed in a centrosymmetric manner; and each annular slot group is composed of four concentric annular slots that are distributed in a nested manner; a transceiver antenna TX transmits a horizontally polarized electromagnetic wave; a scattered wave obtained; a transceiver acquires a frequency spectrum of the scattered wave; the spectrum is converted into a time-domain signal; a response of the tag is extracted; and an MFCC feature of the time-domain signal is extracted.

Abstract: Discloses a combined ultra-wideband cross-polarized chipless RFID tag based on MFCC feature coding, which comprises a tag patch unit, a dielectric substrate and a grounding layer, wherein the tag patch unit comprises a barcode-type resonant unit and a double L-type resonant unit; the barcode-type resonant unit consists of five identical rectangular patches arranged in parallel and rotated counterclockwise; the double L-type resonant unit is formed by reversely combining two L-type patches composed of four identical rectangular patches; a transmitting antenna transmits horizontally polarized electromagnetic waves as interrogation signals, the scattered waves reflected by the tag are acquired by a receiving antenna, a receiver acquires the spectrum of the scattered waves to convert the spectrum into time domain signals by inverse Fourier transform, the response of the tag is extracted through a window, and MFCC features are extracted by pre-emphasis and short-time Fourier transform.