2results about How to "Low data rate" patented technology

The invention provides a PWM-based fire-fighting power two-bus power supply and communication method and device, and relates to the technical field of fire-fighting monitoring, and the method comprises the steps: taking a PWM voltage signal sent by a master station to a slave station as a downlink signal, taking a PWM current signal sent by the slave station to the master station as an uplink signal, representing the signal logic based on the combination of PWM frequency and PWM duty ratio, and carrying out the communication of the PWM frequency and the PWM duty ratio; the time length of a timer is defined as a unit pulse width count value according to the minimum pulse width of PWM, a comparison table containing a hexadecimal number, a binary number, a PWM frequency, a PWM duty ratio, a PWM low-level pulse width count value, a PWM high-level pulse width count value and a PWM period value is made, and coding and code sending are carried out based on the comparison table by using a single-byte table look-up method. And decoding and receiving codes based on the comparison table by using a single-byte offset compression look-up table method. Bidirectional PWM communication and PWM waveform coding are adopted, the overall loading capacity of the bus is improved, the bus distance is increased, the error problem can be solved through a verification mechanism based on digital communication of PWM coding, and the communication anti-interference capacity is improved.

The application discloses a multi-beam pulse compression method and system based on FPGA, relates to the field of radar signal processing, and obtains multiple radar beam pulse echo signals, carries out data preprocessing on the multiple radar beam pulse echo signals, carries out first data rearrangement according to beam channel numbers, and obtains first rearranged multi-beam data; carries out delay alignment on the first rearranged multi-beam data, and obtains delay data; carries out second data alternate rearrangement on the delay data according to the parity of the beam channel numbers, and obtains odd channel data and even channel data; carries out frequency domain pulse compression processing on the odd channel data and the even channel data respectively, and outputs multi-beam pulse compression signals. Through the processing of echo data speed reduction and rearrangement, pulse compression processing can be simultaneously carried out on multiple beam echo signals only by consuming limited computing resources, and a large amount of FPGA resources is saved.