METHOD FOR COMPENSATION OF PHASE DISTORTIONS IN MULTICHANNEL SYSTEMS OF ANALOGUE-TO-DIGITAL CONVERSION OF SIGNALS AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC G01S7/40 H03M1/10 

FIELD: radio equipment.

SUBSTANCE: group of inventions relates to radio engineering and can be used in bench equipment for development of devices for receiving and processing radio signals, as well as in working equipment for eliminating phase non-uniformity of channels for receiving radar signals. Method of compensating phase distortions in multichannel analogue-to-digital conversion (ADC) systems is based on generating the required effect on the ADC system using a radio pulse sequence former and removing digital responses for PC analysis from its output. Test bench is used, which provides for alternate installation of adjustable channel cells of the said ADC system. Each ADC channel cell is adjusted in two steps. At the first stage, based on the results of analysis of digital codes from the tuned ADC channel cell, determining the phase-frequency characteristic (PFC), amplitude-frequency characteristic (AFC) and group delay time (GDT) of the ADC signal path. At the second stage, PFC, AFC and GDT analysis results in PC linearize PFC in working pass band for tuned ADC channel cell. Short video pulse, which is a delta function, is applied as an effect on the input of the ADC channel cell. In PC for this cell, individual compensation coefficients are calculated, which are transmitted from a PC using an interface device and stored in memory of coefficients of said channel cell for subsequent linearization of PFC in a given pass band. At the second stage of ADC channel cell adjustment digital samples conversion from output of tuned channel cell in linearizing unit is performed in series by means of digital filter. Procedure is then repeated under conditions of action of compensation coefficients and, if necessary, specified. Other channel cells of the ADC system are tuned in a similar manner. After linearization all tuned channel cells are installed in working multichannel ADC system for their intended use. Device for compensating phase distortions in multichannel systems of ADC signals comprises a radio pulses sequence generator (RPSG), a tunable channel cell comprising a compensation filter and a data writing unit in RAM, a collection board (PC), an interface device consisting of a microcontroller and an interface unit, PC and sampling frequency shaper (SFS). RPSG generates a test signal in the form of a pulse with a given duration and a repetition period, which is transmitted to the ADC of the tunable cell. Samples from the ADC output are sent to the compensation filter and to the multiplexer used to select data from the ADC or from the compensation filter for writing to the RAM unit. Data from the multiplexer output are recorded in RAM. From the RAM, the recorded data are read out and transmitted to the PC for further processing. Controlling recording and reading of samples from RAM is performed by commands from PC. Control commands of processes of recording and reading of samples are transmitted to a tuned channel cell using an interface device. Compensation coefficients for the filter are calculated in the PC using specially developed software and transmitted to the tuned cell by means of an interface device.

EFFECT: technical result of the claimed invention is the possibility of detecting and compensating phase distortions in channels of a multichannel ADC system, which is part of devices for receiving and processing radar signals, carried out by linearizing the phase-frequency characteristic in a given pass band of radio signals for each channel of the multichannel system.

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