Method and apparatus for controlling the false alarm rate of a receiver
First Claim
1. An apparatus for controlling the false alarm rate of a receiver wherein the receiver is adapted to receive signals in response to source signals which are transmitted at a predetermined transmission frequency, thereby defining a predetermined transmission period between source signals, the apparatus comprising:
- total signal detecting means for detecting each received signal which has a power level greater than a predetermined threshold level and which is received within a predetermined detection interval, wherein the predetermined detection interval includes at least one predetermined transmission period, and wherein the signals received within a predetermined transmission period can include an initial signal which has a power level greater than the predetermined threshold level and a plurality of excess signals received subsequent to the initial signal which also have a power level greater than the predetermined threshold level;
excess signal detecting means for detecting each excess signal which is received within the predetermined detection interval;
ratio determining means, responsive to said total signal detecting means and said excess signal detecting means, for determining a ratio of the total number of received signals detected by said total signal detecting means within the predetermined detection interval to the total number of excess signals detected by said excess signal detecting means within the predetermined detection interval; and
threshold adjusting means, responsive to said ratio determining means, for adjusting the threshold level in response to the ratio determined by said ratio determining means such that the false alarm rate of the receiver is thereby controlled.
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Accused Products
Abstract
A method and apparatus for controlling the false alarm rate of a receiver which detects each received signal having a power level greater than a predetermined threshold level which is received within a predetermined detection interval. The receiver is adapted to receive signals in response to source signals having a predetermined transmission period. The signals detected within each transmission period can include an initial signal and a plurality of excess signals received subsequent to the initial signal. The total number of detected signals and the number of excess signals received within the predetermined detection interval are counted and a ratio therebetween is determined. Based upon the ratio of the total number of signals to the number of excess signals, the relationship between the power level of the received signals and the threshold level is adjusted in order to control the false alarm rate of the receiver. In one embodiment, the threshold level is adjusted based upon the ratio of the total number of received signals to the total number of excess signals. In another embodiment, the amplification or attenuation of the received signals is adjusted in response to the ratio of the total number of received signals to the total number of excess signals.
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Citations
20 Claims
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1. An apparatus for controlling the false alarm rate of a receiver wherein the receiver is adapted to receive signals in response to source signals which are transmitted at a predetermined transmission frequency, thereby defining a predetermined transmission period between source signals, the apparatus comprising:
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total signal detecting means for detecting each received signal which has a power level greater than a predetermined threshold level and which is received within a predetermined detection interval, wherein the predetermined detection interval includes at least one predetermined transmission period, and wherein the signals received within a predetermined transmission period can include an initial signal which has a power level greater than the predetermined threshold level and a plurality of excess signals received subsequent to the initial signal which also have a power level greater than the predetermined threshold level; excess signal detecting means for detecting each excess signal which is received within the predetermined detection interval; ratio determining means, responsive to said total signal detecting means and said excess signal detecting means, for determining a ratio of the total number of received signals detected by said total signal detecting means within the predetermined detection interval to the total number of excess signals detected by said excess signal detecting means within the predetermined detection interval; and threshold adjusting means, responsive to said ratio determining means, for adjusting the threshold level in response to the ratio determined by said ratio determining means such that the false alarm rate of the receiver is thereby controlled. - View Dependent Claims (2, 3, 4)
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5. An apparatus for controlling the false alarm rate of a receiver wherein the receiver is adapted to receive signals in response to source signals which are transmitted at a predetermined transmission frequency, thereby defining a predetermined transmission period between source signals, the apparatus comprising:
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a comparator for detecting each received signal which has a power level greater than a predetermined threshold level, wherein the signals detected within a predetermined transmission period can include an initial signal and a plurality of excess signals detected subsequent to the initial signal; a detection interval timer for measuring a predetermined detection interval, wherein the predetermined detection interval includes at least one predetermined transmission period; a first counter, responsive to said comparator and said detection interval timer, for counting each signal detected by said comparator within the predetermined detection interval to thereby generate a total signal count; a second counter, responsive to said comparator and said detection interval timer, for counting each excess signal which is received within the predetermined detection interval to thereby generate an excess signal count; ratio determining means, responsive to said first and second counters, for determining a ratio of the total signal count to the excess signal count; and threshold adjusting means, responsive to said ratio determining means, for adjusting a relationship between the power level of the received signals and the threshold level in response to the ratio determined by said ratio determining means such that the false alarm rate of the receiver is thereby controlled. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method of controlling the false alarm rate of a receiver wherein the receiver is adapted to receive signals in response to source signals which are transmitted at a predetermined transmission frequency, thereby defining a predetermined transmission period between source signals, the method comprising the steps of:
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detecting each received signal which has a power level greater than a predetermined threshold level and which is received within a predetermined detection interval, wherein the predetermined detection interval includes at least one predetermined transmission period, and wherein the signals detected within a predetermined transmission period can include an initial signal and a plurality of excess signals received subsequent to the initial signal; detecting each excess signal which is received within the predetermined detection interval; determining a ratio of the total number of signals detected within the predetermined detection interval to the total number of excess signals detected within the predetermined detection interval; and adjusting a relationship between the power level of the received signals and the threshold level in response to the determined ratio of the total number of signals to the total number of excess signals such that the false alarm rate of the receiver is thereby controlled. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification