Method and System for Energy Efficient Measurement of Sensor Signals
A method for measuring sensor signals, has the steps: a) receiving a signal packet with a plurality of sampled sensor signals; b) determining a signal level from the sampled sensor signals; c) determining signal variations within the packet; d) comparing the determined signal variations with a predetermined noise threshold and if the variations are below the noise threshold then using the signal packet for further processing and if the variations are above the noise threshold then summing the signal level and repeating steps a) to c) and determining a predetermined number of repetitions has been reached and if so averaging the summed signal level.
1 . A method for measuring sensor signals, comprising:
a) receiving a signal packet comprising a plurality of sampled sensor signals;
b) determining a signal level from said sampled sensor signals;
c) determining signal variations within the packet;
d) comparing the determined signal variations with a predetermined noise threshold and if the variations are below the noise threshold then using the signal packet for further processing and if the variations are above the noise threshold then summing the signal level and repeating steps a) to c) and determining a predetermine number of repetitions has been reached and if so averaging the summed signal level.
2 . The method according to claim 1 , wherein if during the repetition of steps a) to c) it is determined in step c) that the signal variations of a current signal packet are below the predetermined noise threshold, then discarding the summed signal level and use the signal level of the current signal packet.
3 . The method according to claim 1 , wherein the number of repetitions is a predetermined number between 1 to 256.
4 . The method according to claim 1 , wherein a signal packet comprises sampling of a received signal synchronous with a transmitted signal.
5 . The method according to claim 4 , wherein a signal packet comprises sampling values in the maximum and minimum regions of a carrier frequency.
6 . The method according to claim 1 , further comprising delaying the repetition measurements by inserting a delay between subsequent measurements.
7 . The method according to claim 6 , wherein the delay is varied with each repetition.
8 . The method according to claim 6 , wherein the delay is increased with each repetition.
9 . The method according to claim 6 , wherein the delay is decreased with each repetition.
10 . The method according to claim 7 , wherein the total delay of all delays during the repetition of the signal packets is equal the time between two subsequent signal packets.
11 . The method according to claim 1 , further comprising validating the measurement.
12 . The method according to claim 11 , further comprising delaying the repetition of validation measurements.
13 . The method according to claim 12 , further comprising varying the delaying between subsequent validation measurements.
14 . The method according to claim 11 , wherein validating the measurement requires a minimum amount of repetitively receiving sets of valid signal packets.
15 . The method according to claim 14 , wherein the minimum amount of sets of already averaged signal packages can be set between 1-256.
16 . The method according to claim 11 , wherein the signal level is compared with a threshold level to determine a state of the sensor.
17 . The method according to claim 16 , further comprising validating the determination whether a sensor state changes.
18 . The method according to claim 17 , wherein validating the determination of a sensor state change requires either a minimum set of measurements with a processed signal level below the threshold level while the current state of the sensor is in a first state, or requires a minimum set of measurements with a processed signal level above the threshold level while the current state of the sensor is in a second state.
19 . The method according to claim 1 , further comprising determining whether the signal level is overloaded or distorted and repeating the measurement up to a predetermined number of times to obtain an undistorted signal level.
20 . A method for measuring sensor signals, comprising:
a) receiving a signal packet comprising a plurality of sampled sensor signals, wherein the signal packet comprises sampling of a received signal synchronous with a transmitted signal;
b) determining a signal level from said sampled sensor signals;
c) determining signal variations within the packet;
d) comparing the determined signal variations with a predetermined noise threshold and if the variations are below the noise threshold then using the signal packet for further processing and if the variations are above the noise threshold then summing the signal level and repeating steps a) to c) and determining a predetermine number of repetitions has been reached and if so averaging the summed signal level, wherein if during the repetition of steps a) to c) it is determined in step c) that the signal variations of a current signal packet are below the predetermined noise threshold, then discarding the summed signal level and use the signal level of the current signal packet.
21 . The method according to claim 20 , further comprising delaying the repetition measurements by inserting a delay between subsequent measurements.
22 . The method according to claim 21 , further comprising validating the measurement, wherein validating the measurement requires a minimum amount of receiving valid signal packets.
23 . The method according to claim 22 , validating the determination of sensor state change requires either a minimum set of measurements with a processed signal level below the threshold level while the current state of the sensor is in a first state, or requires a minimum set of measurements with a processed signal level above the threshold level while the current state of the sensor is in a second state.
24 . The method according to claim 23 , further comprising determining whether the signal level is overloaded or distorted and repeating the measurement up to a predetermined number of times to obtain an undistorted signal level.