ATSEP-Surveillance Test Questions and Complete Solutions Graded A+.

  Beam Width - Answer: What determines range resolution of radar system Azimuth resolution - Answer: Measure of how well a radar can distinguish 2 targets of different bearing but same range Range resolution - Answer: Measure of how well a radar can distinguish 2 targets of same bearing but different range 1030 MHz - Answer: Freq of the interrogator 1090 MHz - Answer: Freq of the transponder 8us - Answer: Distance between 2 pulses in Mode A 21 us - Answer: Distance between 2 pulses in Mode C Elevation, azimuth, range - Answer: A 3-dimensional radar measures scattering ability of the target - Answer: Radar cross section means matched filters - Answer: Receiver has what filter DPSK - Answer: Uplink modulation P6 - Answer: Uplink format pulse Garble - Answer: is a fundamental problem in the design of the conventional SSR system and the situation is worsened by increased traffic. 8-12 - Answer: X-band range Received Reply Meant for other Interrogator - Answer: RUIT monostatic - Answer: Tx and Rx are the same 8107 m - Answer: Get max range o Given: Tx power = 2kW, antenna gain = 28 dB, freq = 10GHz, Radar cross section area = 12m2, MDS = -90 dBm o Choices: 1k, 2k+, 4k+, 8k+ Multi Doppler Filter - Answer: ASR system may employ a ___ to suppress not just ground clutters but also weather and other mobile clutters. Azimuth resolution - Answer: What is the measure of how well a radar can distinguish two different targets of different bearing but of the same range? False Alarm - Answer: is an erroneous radar target caused by noise or other interfering signals exceeding the radar's detection threshold. Pulse Width - Answer: What characteristic of the transmitted radar pulse determines the range resolution of a radar system? Constant false alarm rate - Answer: What is the name of an adaptive algorithm in radar systems that varies the detection threshold as a function of the sensed environment to maintain the desired number of false alarms? Beamwidth - Answer: Azimuth resolution of a radar system is determined what antenna characteristic? Sliding window - Answer: This method of determining the azimuth requires the radar to get the average between the leading and the trailing azimuth of the target. Normal Video - Answer: This radar video signal consists of both MTI and clutters Distance - Answer: One principle used in radar systems is that EM waves travel at constant speed, this allows for determining the ___ of the target. Duplexer - Answer: This component of the primary radar alternatively switches the antenna between the transmitter and the receiver so that only a single antenna is used. Pulse Width - Answer: The minimum range that the radar can measure is affected by signal-to-noise ratio - Answer: Besides improving the range resolution of the radar system, pulse compression also improves Chirp - Answer: A type of radar pulse used in pulse compression system in which frequency increases or decreases with time. Hit - Answer: Video signals that exceed the detection threshold level in the direction of the radar sweep is called 60 - Answer: ASR are used to monitor aircraft positions up to __ nautical miles Dwell time - Answer: The time that an antenna beam spends on a target is called MTI VIdeo - Answer: Radar video signal that consists of moving targets only is called Clutter - Answer: are unwanted echoes from weather (dense cloud formation, precipitation, etc.), sea (waves), ground (buildings, mountains, grass, etc.) and even flocks of birds A/D converter - Answer: What is used to transform the amplitude and phase of an IF signal into digital form 12.36 - Answer: 1. 1 radar mile is equivalent to ___ microseconds 12.36 Short range surveillance - Answer: n ASR system uses two pulse width: short and long pulses. Short pulses are used for what purpose? Airport Surveillance Radar - Answer: Which primary radar is used to detect and display an aircraft's position in the terminal maneuvering area? Pulse Repetition Time - Answer: What characteristic of the transmitted radar pulse determines the maximum unambiguous range of a system? Range Resolution - Answer: It is the ability of the radar to distinguish two or more targets of the same bearing at different ranges. The lower it is, the better the radar is. Chirp Modulator - Answer: A primary radar with pulse compression system employs a pulse compressor at the receiver and what circuit in the transmitter? PRF, Pulse width, Duty cycle - Answer: In pulse radar systems, the average power is directly proportional to the ___ of the radar pulse. S-band - Answer: Airport Surveillance Radars operate at what band in the RF spectrum Monopulse Process - Answer: provides means to measure angle error for each pulse of the reply thus providing better accuracy... Off Boresight Angle (OBA) - Answer: The angle between the antenna axis and reception azimuth UF11 - Answer: Mode S Interrogations ALl CALL FORMAT Lockout Protocol - Answer: means the aircraft will not reply to any All-Call interrogations from any SSR mode S interrogations for 18s DF11 - Answer: Format of the reply of aircraft during Lockout Protocol allows an adjacent station to be answered by the locked aircraft. - Answer: multisite protocol P6 - Answer: Uplink Format Pulse Pulse Modulation - Answer: DF modulation