Important aspects ofaradar pulse include minimum range, range resolution, and pulse repetition frequency. The ability to compress the pulse depends on the bandwidth of the transmitted pulse (BW tx) not by its pulse width. In sum, these 'second echoes' appear on the display to be targets closer than they really are. Therefore, to select the bandwidth only with Figure 4: Block diagram of a monostatic pulse radarFigure 4: Block diagram of a monostatic pulse radar The wavelength of a 300 MHz radar is approximately 100 cm. Pulsed radar. The main application is still the military area. Pulse repetition measurement on a single channel of a frequency-hopping radar made with a spectrum analyzer in a zero-Hertz span mode and positive peak detection.   thus the instantaneous frequency is (by definition): Under these conditions, the pulse energy For the maximum range of the pulse radar, the pulse energy is crucial, and not its pulse power:Significant improvements in this situation can be achieved with the internal modulation of the transmit pulse Important distinguishing feature to other radar method is the pulse length In radar terminology, the total length of an electromagnetic wave emission which is equal to the product of the wavelength, frequency, and time duration of emission. Range ambiguity occurs when the time taken for an echo to return from a target is greater than the pulse repetition period (T); if the interval between transmitted pulses is 1000 microseconds, and the return-time of a pulse from a distant target is 1200 microseconds, the apparent distance of the target is only 200 microseconds. which is the same of the resolution of the original linear-frequency-modulation waveform. Source for information on pulse length: A Dictionary of Earth Sciences dictionary. The maximum non ambiguous range varies inversely with PRF and is given by: Tektronix provides a broad selection of test equipment suitable for radar pulses. The return signal, written If the reflected signal comes back to the receiver at time If two pulses come back (nearly) at the same time, the intercorrelation is equal to the sum of the intercorrelations of the two elementary signals. The simplest signal a pulse radar can transmit is a sinusoidal-amplitude pulse, Let us determine the range resolution which can be obtained with such a signal. But knowledge of pulse length can help in setting the radar in way to show the targets clearly. There are many other profiles that can be adopted to optimise the performance of the system, but cosine and trapezoid profiles generally provide a good compromise between efficiency and resolution and so tend to be used most frequently. Pulse length can be set to Short, medium or Long pulse. Early radars limited the bandwidth through filtration in the transmit chain, e.g. It depends on the pulse width as described in the equation. In a pulse compression system, the range-resolution of the radar is given by the length of the pulse at the output-jack of the pulse compressing stage. Another important parameter in the radar system is the radar range resolution. At Pulse width also determines the radar's dead zone at close ranges.

]: McGraw-Hill Education.
In radar or sonar applications, linear chirps are the most typically used signals to achieve pulse compression. The basic principle is the following: This is where pulse compression enters the picture.

The relation of phase to frequency is often used in the other direction, starting with the desired As for the "simple" pulse, let us compute the cross-correlation between the transmitted and the received signal. The WSR-88D incorporates a variable pulse length that may be as short as 1.57 microseconds (1,545 feet).

In general, the receiving bandwidth is kept as small as possible, so not much unnecessary noise is received. Staggered PRF is a transmission process where the time between interrogations from radar changes slightly, Without staggered PRF, any pulses originating from another radar on the same radio frequency might appear stable in time and could be mistaken for reflections from the radar's own transmission. The range to a target is determined by measuring the time that a radar signal takes to travel out to the target and back. The pulse length is usually called the PULSE WIDTH in radar systems. The main lobe is again increased in amplitude and the sidelobes correspondingly reduced, giving a significant improvement in performance. Although stretch processing can reduce the bandwidth of received baseband signal, all of the analog components in RF front-end circuitry still must be able to support an instantaneous bandwidth of Stepped-frequency waveforms are an alternative technique that can preserve fine range resolution and SNR of the received signal without large instantaneous bandwidth.

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