2results about How to "Appropriate width" patented technology

The utility model discloses a compression condensing unit convenient to overhaul, which comprises a unit shell, and a compressor module, a condensation evaporation module, a control valve module and a constant temperature water tank are arranged in the unit shell to form the compression condensing unit. The compressor module comprises a compression device, a gas-liquid separator is arranged on the lower portion of the compression device, and an air suction filter is arranged on the side face of the gas-liquid separator. The maintenance channel is arranged among the compressor module, the condensation and evaporation module and the constant-temperature water tank, the width of the channel is moderate, operators can enter the maintenance channel conveniently and carry out maintenance operation, the maintenance door is arranged on the surface of the unit shell, and the maintenance door corresponds to the maintenance channel. The top of the unit shell is provided with the two sets of ventilation channels, the inner top of the unit shell is provided with the ventilation holes, and the cooling fans are arranged in the ventilation holes, so that it is guaranteed that heat can be fully dissipated when the unit operates, and heat is prevented from being accumulated in the unit.

This invention provides a method for designing stochastic frequency-modulated waveforms to suppress range sidelobes and range ambiguity. The method includes: Step 1: Initialization, inputting the center frequency f of the waveform. c The first step is to determine the bandwidth B and pulse width T; the second step is to determine the instantaneous frequency f of the RFM waveform based on the random Fourier coefficients. t The variance Var(f) t The third step: design N and D; after determining N, use Var(f) to define the range of N and D. t The range of D can be calculated from the range of ), and the largest possible D is selected within this range to obtain a narrower main lobe width; the fourth step: generate random Fourier coefficients; the fifth step: obtain the output RFM waveform. This invention can generate a large-capacity waveform set with low sidelobes, good quasi-orthogonality, high spectral compactness, and constant amplitude. At the same time, by increasing the number of waveforms, sidelobes can be effectively reduced and the maximum unambiguous distance can be extended.