1.1 RF front-end The main function of the RF front-end is to down convert the RF signals received by the antenna, amplify these weak signals, convert the output signals into digital forms, and pr...
1. Monitoring and dispatching The system has established a rapid, accurate and effective information transmission channel between the taxi and the monitoring center. The center can grasp the vehi...
The main purpose of principal component analysis [6] is to replace the original multi-dimensional variables with a few comprehensive variables after linear transformation and discarding part of th...
The traffic flow prediction results on the training set and the corresponding error curve are shown in Figure 2. The original data in Figure 2 (a) represents the actual traffic flow speed Y, and t...
1. Real time monitoring function: The monitoring center can set the monitoring interval (the maximum time is 1 second to monitor vehicles once) to track any vehicle according to its own vehicle mo...
When creating GPS waveform, its unique and increasingly common way is to directly extract it from the air. In this test, we use a vector signal analyzer (such as NI PXI 5661) to record signals, an...
The main product for testing GPS receivers is a set of RF vector signal generators that can simulate GPS signals. In this application description, the reader will know how to use NI PXI-5671 and N...
Because the LNA in series can provide a 60 dB gain, users can greatly increase the power of the front end of the vector signal analyzer. In our measurement operation, a gain of 60 dB is sufficient...
Since many receivers can use appropriate software to enable users to present information such as longitude and latitude, it is necessary to conduct automatic measurement in a more standardized way...
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