2results about How to "Does not affect measurement" patented technology

The invention discloses a benchmark protection device, and relates to the technical field of benchmark protection, the benchmark protection device comprises a shell assembly, the shell assembly comprises a protection shell, the lower end of the protection shell is provided with a protection shell gasket, the upper end of the protection shell is provided with a cover plate, and a cover plate gasket is arranged between the protection shell and the cover plate; the opening and closing assembly comprises a connecting plate, a first rotating rod, a second rotating rod, a spring, a clamping piece, a pressing piece and a limiting piece; the box staff fixing assembly comprises a benchmark, a ball bearing and a box staff rotating bin. The beneficial effects of the invention are that through the cooperation of the cover plate and the opening and closing assembly, the protection shell is closed and opened, under the action of the clamping piece, the cover plate is ensured to be closed tightly, and the cover plate is kept open stably without affecting the measurement under the action of the internal force of the opening and closing assembly during opening; the benchmark is protected through the protective shell, the benchmark is prevented from being corroded and damaged by rainwater, dust and the like, durability of the benchmark can be better guaranteed, the telemeter rod fixing assembly is matched, a telemeter rod can be better fixed during measurement, manpower is saved, and meanwhile the measurement accuracy can be improved.

The application discloses a kind of based on nonlinear dynamics multipath fading robustness radiation source signal characterization method, comprising: S1, receive the signal data of radiation source and carry out data preprocessing, obtain signal x (t) ;S2, calculate time delay parameter tau and embedding dimension m, and reconstruct the phase space to the signal x (t) and obtain matrix S;S3, to matrix S is carried out row direction transformation and channel elimination and obtains matrix S4, to matrix is carried out column direction transformation and logarithmic transformation and obtains reconstructed phase space matrix two-dimensional Fourier transform logarithmic spectrum Θ.The application combines the advantages of nonlinear analysis and spectral analysis, designs and constructs the phase space two-dimensional Fourier transform logarithmic frequency spectrum, by the frequency domain transformation of two-dimensional row and column direction between phase points, the characteristic analysis of nonlinear dynamic system is carried out in frequency domain, on the basis of realizing the elimination of channel influence by the frequency domain mean value between cancellation phase points, without channel estimation and channel compensation, and without affecting the measurement of radiation source fingerprint information.