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A highway police radar operating at 10 GHz observes a Doppler shift of 1,500 Hz when the radar is pointed at a moving car. What is the radial speed of the car toward the radar in miles per hour?
A CW waveform expressed as Ae^ ' at the radar antenna terminals is transmitted. What is the expression at the same antenna terminals for the received signal of amplitude B from a point target at range R?
(a) How many samples per second would be required for unambiguous sampling of a range-extended echo signal from a coherent radar system if the receiver were matched to the transmitted pulse duration of 2.0us? (b) What is the equivalent sample separation in target slant range?
Which of the following signals could be accurately represented in complex form by (1.4): (a) a 10us video pulse (no RF carrier), (b) a 10-Hz to 20-kHz audio signal, or (c) a 2- ns RF echo pulse from a 10-GHz radar?
Two point targets are separated by 3m in slant range, (a) What radar bandwidth is required to resolve the two targets? (b) If the radar is a monotone pulse radar, what should be the maximum transmitted pulse duration?
Describe method of improving string efficiency?
i) the advantage and disadvantage of DC and ac transmission system
ii) the advantage of using high transmission voltage
Determine the voltages at all nodes and the currents through all branches. The minimum value of β is specified to be 20.
what makes the magnetic field in a motor rotate?
The differential equation for a control system is given as follows;
d3c/dt3 + 8d2c/dt2+ 31dc/dt + 48c = d2r/dt2 + 4dr/dt +25r
Determine the following, showing ALL relevant steps
a) The corresponding transfer function in its factorized form
b) Normalized transfer function
c) Magnitude slope plot
d) Phase slope plot
