RU99111878A - METHOD AND DEVICE FOR FORMING THE POLARIZATION PORTRAIT OF THE EARTH (MARINE) SURFACE IN A TWO-FREQUENCY DIGITAL PCA - Google Patents

Claims (2)

1. The method of forming a polarization portrait of the earth (sea) surface, which consists in the fact that two synthesized apertures of the antenna are formed at different carrier frequencies of the probe pulses, each aperture is formed with its own synthesis interval, the value of which is calculated based on a constant azimuth resolution, range resolution in each channel it is maintained constant, characterized in that the apertures form each with its own antenna array with phase centers spaced apart in space in the direction the radar carrier’s flight, moreover, the polarization of the antenna arrays is orthogonal to each other and is determined by two polarization channels, the passband of each of them allows receiving signals of both carrier frequencies, the frequency spacing of the polarization channels is determined by the spectral width of the probe signal and allowable changes in the characteristics of the re-reflection of the located objects, take reflected signals separately for four channels (at each frequency two polarization channels) and determine the modules and phases of the polar components -ionized scattering matrix portion on the surface of the formulas

Where

- the signal at the output of the filter tuned to the frequency ω _{i of the} receiver of the i-th polarization channel after range gating, heterodyning and range compression;

- the essence of the k-th pulse of the reference function of the i-th frequency channel; N _i - the number of sensing pulses in the i-th frequency channel.  2. The device for implementing the method according to claim 1, containing the first and second antenna devices connected, respectively, with the first and second antenna switches, the second inputs of which are connected, respectively, with the outputs of the first and second transmitters, the inputs of which, respectively, are connected to the outputs of the first and second reference signal generators, the inputs of which are connected to the outputs of the synchronizer, the outputs of the first and second antenna switches are connected, respectively, to the inputs of the first and second broadband amplifier radio frequency, characterized in that the polarization of the antenna devices is orthogonal to each other, each device receives signals of both carrier frequencies, the output of the first broadband radio frequency amplifier is connected to the inputs of the first and second band-pass filters, and the output of the second wide-band radio frequency amplifier is connected to the inputs of the third and fourth band-pass filters the outputs of the bandpass filters are connected, respectively, with the inputs of the first, second, third and fourth receivers, the second inputs of which are connected to the outputs the first and second reference signal generators, the outputs of the receivers are connected to the inputs of the first, second, third and fourth channels of digital processing, the second inputs of which are simultaneously outputs and connected to a storage device, other outputs of the channels of digital processing are connected to the inputs of the computer displaying information, the output of the computer is connected with indicator input.