Radar data processor

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The Radar Data Processor is a fast process computer in a radar unit that processes the radar signals for a screen display .

In radar signal processing, the desired data are determined on the basis of Doppler frequency processing and the characteristic amplitudes of the respective video pulses of target characters and separated from interfering signals such as noise and fixed targets. In modern radar devices, the radar signal processing begins after the intermediate frequency amplification with phase-dependent demodulation . In this assembly, the target information also consists of video pulses with a bandwidth of 250 kHz to 5 MHz. This means that the sampling rate for digitization must be at least twice the frequency, i.e. 500 kHz to 10 MHz. These sampling rates are also achieved by modern analog / digital converters (ADC).

The radar data processor can often also take over control tasks and routine system checks ( built-in test equipment ).

In older radar devices (such as the RRP 117 ), the control of the still analog or discrete digital components implemented radar signal processing and the radar data processing are still combined in one computer. In modern radar devices, a separation is made between the radar signal processor (RSP) and the radar data processor (RDP). Here the radar signal processor fulfills all tasks up to the point of automatic target recognition and the following radar data processor processes the recognized target signals ( plots ) further, correlating them with the answers from the secondary radar and with the tracks of other radar devices.

In top-of-the-range devices, the radar signal processor can even regulate the gain factor of the receiver for each range cell individually and depending on the current content of a clutter map . For radar receivers with very high requirements in terms of linearity and overload resistance, such as in weather radar devices , the RSP regulates the amplification of the linear receiver based on the amplitude measurement of the current signal in a receiving section with a logarithmic amplifier.

Individual proof

  1. Radar tutorial block diagram weather radar receiver, automatic gain control by RSP