What is Sweep time in radar?
The time duration between of this periodically modulation is called sweep time (Ts). During the sweep time, the frequency is continuously increased, e.g. from 122 to 123 GHz. When the emitted radarwave hits an object within the radar cone, a portion of the signal is reflected.
What is the principle of Fmcw radar?
The radar principle used is FMCW (Frequency Modulated Continuous Wave). The FMCW-radar transmits a high frequency signal whose frequency increases linearly during the measurement phase (called the frequency sweep). The signal is emitted, reflected from the measuring surface and received with a time delay, t.
What is the difference of three types of radar?
Military radar systems can be divided into three main classes based on platform: land-based, shipborne, and airborne. These descriptions are not precise, for each of these radar types usually employ a characteristic waveform and signal processing that differentiate it from other radars. Land-Based Air Defense Radars.
How is the range of FMCW radar measured?
In FMCW radar, the range to the target is measured by systematically varying the frequency of a transmitted radio frequency (RF) signal. Typically, the transmitted frequency is made to vary linearly with time; for example, a sawtooth or triangular frequency sweep is implemented.
How is the range of a FMCW pulse determined?
A very important type of FMCW radar pulse is the linear FM sweep. In this case, the range to the target is found by detecting the frequency difference between the received and emitted radar signals. The range to the target is proportional to this frequency difference, which is also referred to as the beat frequency.
What’s the name of the frequency during a sweep?
This process is called dechirping or deramping, and the frequency of the dechirped signal is called the beat or intermediate frequency (IF) signal. 1 The term bandwidth[ is often used in this context to refer to the total excursion of the instantaneous frequency during one the sweep period.
How does sweep width affect radar range resolution?
The radar sweep width controls radar range resolution. Large sweep widths improve range resolution and increase the target beat frequency. This enables target detection at higher frequencies where phase noise is lower.