Sensors 4 Flashcards

1
Q

Pulse Characteristics?

A
  1. PW (Pulse Width); FOR RESOLUTION.
  2. PRF (Pulse repetition frequency) (Hz);
  3. Power output (KW); FOR MAX RANGE
  4. Pulse shape :FOR RANGE ACCURACY
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2
Q

Describe Pulse Width

A

Duration is measured in microseconds (1 microsecond = 1000’)

Measured from leading to trailing edges

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3
Q

Describe PRF (# of pulse per second)

A

Rate a which pulses are transmitted.

Measured in pulses per second (Hz)

Measured from leading edge of one to leading edge of next
1 cycle = PRI = 300 cycles for example…= 300 cycles/sec = PRF 300Hz

PRF = 1/PRI

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4
Q

Describe Power output

A

Peak power = max power transmitted during a pulse

Average power = power averaged over the PRI

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5
Q

Describe pulse shape

A

Sharp leading and trailing edges = IDEAL

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6
Q

The shorter the pulse width…

A

the better range resolution. No target overlap..provides 2 distinct target

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7
Q

Longer pulse =

A

Greater choice of return. Target overlap…results in single returns (appears as 1 target)

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8
Q

Wide pulse =

A

Greater Max Range

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9
Q

Narrow pulse =

A

better range resolution

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10
Q

Which Pulse charac. is responsible for Max range?

A

Power. And to a leaser extent PW…Why? because a shorter PW allows more time to listen for a returning signal from a further distance to get back to the receiver.

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11
Q

Which Pulse charac. is responsible for resolution?

A

Pulse Width (PW)

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12
Q

Which Pulse charac. is responsible for Range accuracy?

A

Pulse Shape. And we are looking for a sharp leading edge (for an accurate timing start)

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13
Q

If you wanted to get very accurate ranging & target resolution, what charac. would you ensure?

A

Pulse shape (Sharp leading and trealing edge) & Narrow PW

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14
Q

If you wanted to increase your max range, but still wanted good target resolution, and couldn’t increase power, what else would you change?

A

That is beyond our control…

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15
Q

WHAT is the effect of Varying Characteristics?

A

PRF/PW/Peak Power/Avg Power/ Max range

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