Radar trilateralization position locators
First Claim
1. Means for validating timed radar signals comprising means for repeatedly storing initial data responsive to transmitting radar signals, data accumulation means, means for transferring said initially stored data to said data accumulator means whereby said accumulator means stores an average of previously received data which was initially stored and then transferred to said accumulator, means in said accumulator for accepting the transferred data which is consistent with previously accumulated data and rejecting data which is non-consistent therewith, means responsive to the receipt of non-consistent data for returning said initial data storage means to a condition wherein it stores the last previously received consistent data, and means responsive to the accumulation of a predetermined amount of said accepted data for giving a read out of the average of said accumulated data.
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Abstract
A radar position locator system uses a mobile and at least two stationary transceivers. The signals are validated by being stored and compared with previously received signals. If the comparison indicates that the received signal is within a range of a reasonably possible change, as compared to the previously received signals, it is accepted. Otherwise, it is rejected and the memory circuit which stored the signal for validation is backed up to the last previously stored valid signal. The stationary transceivers function somewhat as a surveyor'"'"'s bench mark. Each transceiver is individually identified by a coded stream of radar pulses, as, for example, a stream of pulses transmitted at a predetermined transceiver identifying pulse repetition rate. A selected number of validated radar signals are transmitted between the mobile and stationary transceivers. The round trip transmission times of several of these signals are averaged, and a digital read out indicates the distance represented by such averaging.
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Citations
8 Claims
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1. Means for validating timed radar signals comprising means for repeatedly storing initial data responsive to transmitting radar signals, data accumulation means, means for transferring said initially stored data to said data accumulator means whereby said accumulator means stores an average of previously received data which was initially stored and then transferred to said accumulator, means in said accumulator for accepting the transferred data which is consistent with previously accumulated data and rejecting data which is non-consistent therewith, means responsive to the receipt of non-consistent data for returning said initial data storage means to a condition wherein it stores the last previously received consistent data, and means responsive to the accumulation of a predetermined amount of said accepted data for giving a read out of the average of said accumulated data.
- 2. A system for validating repeatedly transmitted information signals which are subject to change in a predictable manner, said system comprising at least two stations, means for repeatedly transmitting said information signals between said two stations, means responsive to the receipt of each of said information signals for initially storing each of said signals as it is received, means for comparing the signal in said initial storage with previously received signals, and signal averaging means for accepting and averaging signals in said initial storage only when said comparing means indicates that said initially stored signal falls within said predictable change as compared to said previously received signals and for returning said initial storage to a previously received information signal responsive to initially stored data which did not fall within said predictable change.
Specification